-- main.lua

-- Implements the plugin entrypoint (in this case the entire plugin)





-- Global variables:
g_Plugin = nil;
g_PluginFolder = "";
g_TrackedPages = {};  -- List of tracked pages, to be checked later whether they exist. Each item is an array of referring pagenames.
g_Stats =  -- Statistics about the documentation
{
	NumTotalClasses = 0,
	NumUndocumentedClasses = 0,
	NumTotalFunctions = 0,
	NumUndocumentedFunctions = 0,
	NumTotalConstants = 0,
	NumUndocumentedConstants = 0,
	NumTotalVariables = 0,
	NumUndocumentedVariables = 0,
	NumTotalHooks = 0,
	NumUndocumentedHooks = 0,
	NumTrackedLinks = 0,
	NumInvalidLinks = 0,
}






function Initialize(Plugin)
	g_Plugin = Plugin;
	
	Plugin:SetName("APIDump");
	Plugin:SetVersion(1);
	
	LOG("Initialising " .. Plugin:GetName() .. " v." .. Plugin:GetVersion())
	
	g_PluginFolder = Plugin:GetLocalFolder();
	
	-- Load the API descriptions from the Classes and Hooks subfolders:
	if (g_APIDesc.Classes == nil) then
		g_APIDesc.Classes = {};
	end
	if (g_APIDesc.Hooks == nil) then
		g_APIDesc.Hooks = {};
	end
	LoadAPIFiles("/Classes/", g_APIDesc.Classes);
	LoadAPIFiles("/Hooks/",   g_APIDesc.Hooks);

	-- dump all available API functions and objects:
	-- DumpAPITxt();
	
	-- Dump all available API object in HTML format into a subfolder:
	DumpAPIHtml();
	
	LOG("APIDump finished");
	
	return true
end





function LoadAPIFiles(a_Folder, a_DstTable)
	local Folder = g_PluginFolder .. a_Folder;
	for idx, fnam in ipairs(cFile:GetFolderContents(Folder)) do
		local FileName = Folder .. fnam;
		-- We only want .lua files from the folder:
		if (cFile:IsFile(FileName) and fnam:match(".*%.lua$")) then
			local TablesFn, Err = loadfile(FileName);
			if (TablesFn == nil) then
				LOGWARNING("Cannot load API descriptions from " .. FileName .. ", Lua error '" .. Err .. "'.");
			else
				local Tables = TablesFn();
				for k, cls in pairs(Tables) do
					a_DstTable[k] = cls;
				end
			end  -- if (TablesFn)
		end  -- if (is lua file)
	end  -- for fnam - Folder[]
end





function DumpAPITxt()
	LOG("Dumping all available functions to API.txt...");
	function dump (prefix, a, Output)
		for i, v in pairs (a) do
			if (type(v) == "table") then
				if (GetChar(i, 1) ~= ".") then
					if (v == _G) then
						-- LOG(prefix .. i .. " == _G, CYCLE, ignoring");
					elseif (v == _G.package) then
						-- LOG(prefix .. i .. " == _G.package, ignoring");
					else
						dump(prefix .. i .. ".", v, Output)
					end
				end
			elseif (type(v) == "function") then
				if (string.sub(i, 1, 2) ~= "__") then
					table.insert(Output, prefix .. i .. "()");
				end
			end
		end
	end

	local Output = {};
	dump("", _G, Output);

	table.sort(Output);
	local f = io.open("API.txt", "w");
	for i, n in ipairs(Output) do
		f:write(n, "\n");
	end
	f:close();
	LOG("API.txt written.");
end





function CreateAPITables()
	--[[
	We want an API table of the following shape:
	local API = {
		{
			Name = "cCuboid",
			Functions = {
				{Name = "Sort"},
				{Name = "IsInside"}
			},
			Constants = {
			},
			Variables = {
			},
			Descendants = {},  -- Will be filled by ReadDescriptions(), array of class APIs (references to other member in the tree)
		}},
		{
			Name = "cBlockArea",
			Functions = {
				{Name = "Clear"},
				{Name = "CopyFrom"},
				...
			},
			Constants = {
				{Name = "baTypes", Value = 0},
				{Name = "baMetas", Value = 1},
				...
			},
			Variables = {
			},
			...
		}}
	};
	local Globals = {
		Functions = {
			...
		},
		Constants = {
			...
		}
	};
	--]]

	local Globals = {Functions = {}, Constants = {}, Variables = {}, Descendants = {}};
	local API = {};
	
	local function Add(a_APIContainer, a_ObjName, a_ObjValue)
		if (type(a_ObjValue) == "function") then
			table.insert(a_APIContainer.Functions, {Name = a_ObjName});
		elseif (
			(type(a_ObjValue) == "number") or
			(type(a_ObjValue) == "string")
		) then
			table.insert(a_APIContainer.Constants, {Name = a_ObjName, Value = a_ObjValue});
		end
	end
	
	local function ParseClass(a_ClassName, a_ClassObj)
		local res = {Name = a_ClassName, Functions = {}, Constants = {}, Variables = {}, Descendants = {}};
		-- Add functions and constants:
		for i, v in pairs(a_ClassObj) do
			Add(res, i, v);
		end
		
		-- Member variables:
		local SetField = a_ClassObj[".set"] or {};
		if ((a_ClassObj[".get"] ~= nil) and (type(a_ClassObj[".get"]) == "table")) then
			for k, v in pairs(a_ClassObj[".get"]) do
				if (SetField[k] == nil) then
					-- It is a read-only variable, add it as a constant:
					table.insert(res.Constants, {Name = k, Value = ""});
				else
					-- It is a read-write variable, add it as a variable:
					table.insert(res.Variables, { Name = k });
				end
			end
		end
		return res;
	end
	
	for i, v in pairs(_G) do
		if (
			(v ~= _G) and           -- don't want the global namespace
			(v ~= _G.packages) and  -- don't want any packages
			(v ~= _G[".get"]) and
			(v ~= g_APIDesc)
		) then
			if (type(v) == "table") then
				table.insert(API, ParseClass(i, v));
			else
				Add(Globals, i, v);
			end
		end
	end
	
	return API, Globals;
end





function DumpAPIHtml()
	LOG("Moving static files.");
	
	for i in cFile:GetFolderContents("Static") do
		cFile:Copy("Static/" .. i, "API/" .. i);	
	end
	
	LOG("Dumping all available functions and constants to API subfolder...");

	LOG("Creating API tables...");
	local API, Globals = CreateAPITables();
	local Hooks = {};
	local UndocumentedHooks = {};
	
	-- Sort the classes by name:
	LOG("Sorting...");
	table.sort(API,
		function (c1, c2)
			return (string.lower(c1.Name) < string.lower(c2.Name));
		end
	);
	
	g_Stats.NumTotalClasses = #API;
	
	-- Add Globals into the API:
	Globals.Name = "Globals";
	table.insert(API, Globals);
	
	-- Extract hook constants:
	for name, obj in pairs(cPluginManager) do
		if (
			(type(obj) == "number") and
			name:match("HOOK_.*") and
			(name ~= "HOOK_MAX") and
			(name ~= "HOOK_NUM_HOOKS")
		) then
			table.insert(Hooks, { Name = name });
		end
	end
	table.sort(Hooks,
		function(Hook1, Hook2)
			return (Hook1.Name < Hook2.Name);
		end
	);
	
	-- Read in the descriptions:
	LOG("Reading descriptions...");
	ReadDescriptions(API);
	ReadHooks(Hooks);
	
	-- Create the output folder
	if not(cFile:IsFolder("API")) then
		cFile:CreateFolder("API");
	end

	-- Create a "class index" file, write each class as a link to that file,
	-- then dump class contents into class-specific file
	LOG("Writing HTML files...");
	local f = io.open("API/index.html", "w");
	if (f == nil) then
		LOGINFO("Cannot output HTML API: " .. err);
		return;
	end
	
	f:write([[<!DOCTYPE html>
		<html>
		<head>
		<title>MCServer API - Index</title>
		<link rel="stylesheet" type="text/css" href="main.css" />
		</head>
		<body>
		<div id="content">
		<header>
		<h1>MCServer API - Index</h1>
		<hr />
		</header>
		<p>The API reference is divided into the following sections:</p>
		<ul>
		<li><a href="#classes">Class index</a></li>
		<li><a href="#hooks">Hooks</a></li>
		<li><a href="#extra">Extra pages</a></li>
		<li><a href="#docstats">Documentation statistics</a></li>
		</ul>
		<hr />
		<a name="classes"><h2>Class index</h2></a>
		<p>The following classes are available in the MCServer Lua scripting language:
		<ul>
	]]);
	for i, cls in ipairs(API) do
		f:write("<li><a href=\"", cls.Name, ".html\">", cls.Name, "</a></li>\n");
		WriteHtmlClass(cls, API);
	end
	f:write([[
		</ul></p>
		<hr />
		<a name="hooks"><h2>Hooks</h2></a>
		<p>
		A plugin can register to be called whenever an "interesting event" occurs. It does so by calling
		<a href="cPluginManager.html">cPluginManager</a>'s AddHook() function and implementing a callback
		function to handle the event.</p>
		<p>
		A plugin can decide whether it will let the event pass through to the rest of the plugins, or hide it
		from them. This is determined by the return value from the hook callback function. If the function
		returns false or no value, the event is propagated further. If the function returns true, the processing
		is	stopped, no other plugin receives the notification (and possibly MCServer disables the default
		behavior for the event). See each hook's details to see the exact behavior.</p>
		<table>
		<tr>
		<th>Hook name</th>
		<th>Called when</th>
		</tr>
	]]);
	for i, hook in ipairs(Hooks) do
		if (hook.DefaultFnName == nil) then
			-- The hook is not documented yet
			f:write("				<tr>\n					<td>" .. hook.Name .. "</td>\n					<td><i>(No documentation yet)</i></td>\n 				</tr>\n");
			table.insert(UndocumentedHooks, hook.Name);
		else
			f:write("				<tr>\n					<td><a href=\"" .. hook.DefaultFnName .. ".html\">" .. hook.Name .. "</a></td>\n					<td>" .. LinkifyString(hook.CalledWhen, hook.Name) .. "</td>\n				</tr>\n");
			WriteHtmlHook(hook);
		end
	end
	f:write([[			</table>
	
			<hr />
			<a name="extra"><h2>Extra pages</h2></a>
			
			<p>The following pages provide various extra information</p>
			
			<ul>
]]);
	for i, extra in ipairs(g_APIDesc.ExtraPages) do
		local SrcFileName = g_PluginFolder .. "/" .. extra.FileName;
		if (cFile:Exists(SrcFileName)) then
			local DstFileName = "API/" .. extra.FileName;
			if (cFile:Exists(DstFileName)) then
				cFile:Delete(DstFileName);
			end
			cFile:Copy(SrcFileName, DstFileName);
			f:write("				<li><a href=\"" .. extra.FileName .. "\">" .. extra.Title .. "</a></li>\n");
		else
			f:write("				<li>" .. extra.Title .. " <i>(file is missing)</i></li>\n");
		end
	end
	f:write("</ul>");

	-- Copy the static files to the output folder (overwrite any existing):
	cFile:Copy(g_Plugin:GetLocalFolder() .. "/main.css", "API/main.css");
	cFile:Copy(g_Plugin:GetLocalFolder() .. "/prettify.js", "API/prettify.js");
	cFile:Copy(g_Plugin:GetLocalFolder() .. "/prettify.css", "API/prettify.css");
	cFile:Copy(g_Plugin:GetLocalFolder() .. "/lang-lua.js", "API/lang-lua.js");
	
	-- List the documentation problems:
	LOG("Listing leftovers...");
	ListUndocumentedObjects(API, UndocumentedHooks);
	ListUnexportedObjects();
	ListMissingPages();

	WriteStats(f);
	
	f:write([[			</ul>
		</div>
	</body>
</html>]]);
	f:close();
	
	LOG("API subfolder written");
end





function ReadDescriptions(a_API)
	-- Returns true if the class of the specified name is to be ignored
	local function IsClassIgnored(a_ClsName)
		if (g_APIDesc.IgnoreClasses == nil) then
			return false;
		end
		for i, name in ipairs(g_APIDesc.IgnoreClasses) do
			if (a_ClsName:match(name)) then
				return true;
			end
		end
		return false;
	end
	
	-- Returns true if the function is to be ignored
	local function IsFunctionIgnored(a_ClassName, a_FnName)
		if (g_APIDesc.IgnoreFunctions == nil) then
			return false;
		end
		if (((g_APIDesc.Classes[a_ClassName] or {}).Functions or {})[a_FnName] ~= nil) then
			-- The function is documented, don't ignore
			return false;
		end
		local FnName = a_ClassName .. "." .. a_FnName;
		for i, name in ipairs(g_APIDesc.IgnoreFunctions) do
			if (FnName:match(name)) then
				return true;
			end
		end
		return false;
	end
	
	-- Returns true if the constant (specified by its fully qualified name) is to be ignored
	local function IsConstantIgnored(a_CnName)
		if (g_APIDesc.IgnoreConstants == nil) then
			return false;
		end;
		for i, name in ipairs(g_APIDesc.IgnoreConstants) do
			if (a_CnName:match(name)) then
				return true;
			end
		end
		return false;
	end
	
	-- Returns true if the member variable (specified by its fully qualified name) is to be ignored
	local function IsVariableIgnored(a_VarName)
		if (g_APIDesc.IgnoreVariables == nil) then
			return false;
		end;
		for i, name in ipairs(g_APIDesc.IgnoreVariables) do
			if (a_VarName:match(name)) then
				return true;
			end
		end
		return false;
	end
	
	-- Remove ignored classes from a_API:
	local APICopy = {};
	for i, cls in ipairs(a_API) do
		if not(IsClassIgnored(cls.Name)) then
			table.insert(APICopy, cls);
		end
	end
	for i = 1, #a_API do
		a_API[i] = APICopy[i];
	end;

	-- Process the documentation for each class:
	for i, cls in ipairs(a_API) do
		-- Initialize default values for each class:
		cls.ConstantGroups = {};
		cls.NumConstantsInGroups = 0;
		cls.NumConstantsInGroupsForDescendants = 0;
		
		-- Rename special functions:
		for j, fn in ipairs(cls.Functions) do
			if (fn.Name == ".call") then
				fn.DocID = "constructor";
				fn.Name = "() <i>(constructor)</i>";
			elseif (fn.Name == ".add") then
				fn.DocID = "operator_plus";
				fn.Name = "<i>operator +</i>";
			elseif (fn.Name == ".div") then
				fn.DocID = "operator_div";
				fn.Name = "<i>operator /</i>";
			elseif (fn.Name == ".mul") then
				fn.DocID = "operator_mul";
				fn.Name = "<i>operator *</i>";
			elseif (fn.Name == ".sub") then
				fn.DocID = "operator_sub";
				fn.Name = "<i>operator -</i>";
			elseif (fn.Name == ".eq") then
				fn.DocID = "operator_eq";
				fn.Name = "<i>operator ==</i>";
			end
		end
		
		local APIDesc = g_APIDesc.Classes[cls.Name];
		if (APIDesc ~= nil) then
			APIDesc.IsExported = true;
			cls.Desc = APIDesc.Desc;
			cls.AdditionalInfo = APIDesc.AdditionalInfo;
			
			-- Process inheritance:
			if (APIDesc.Inherits ~= nil) then
				for j, icls in ipairs(a_API) do
					if (icls.Name == APIDesc.Inherits) then
						table.insert(icls.Descendants, cls);
						cls.Inherits = icls;
					end
				end
			end

			cls.UndocumentedFunctions = {};  -- This will contain names of all the functions that are not documented
			cls.UndocumentedConstants = {};  -- This will contain names of all the constants that are not documented
			cls.UndocumentedVariables = {};  -- This will contain names of all the variables that are not documented
			
			local DoxyFunctions = {};  -- This will contain all the API functions together with their documentation
			
			local function AddFunction(a_Name, a_Params, a_Return, a_Notes)
				table.insert(DoxyFunctions, {Name = a_Name, Params = a_Params, Return = a_Return, Notes = a_Notes});
			end
			
			if (APIDesc.Functions ~= nil) then
				-- Assign function descriptions:
				for j, func in ipairs(cls.Functions) do
					local FnName = func.DocID or func.Name;
					local FnDesc = APIDesc.Functions[FnName];
					if (FnDesc == nil) then
						-- No description for this API function
						AddFunction(func.Name);
						if not(IsFunctionIgnored(cls.Name, FnName)) then
							table.insert(cls.UndocumentedFunctions, FnName);
						end
					else
						-- Description is available
						if (FnDesc[1] == nil) then
							-- Single function definition
							AddFunction(func.Name, FnDesc.Params, FnDesc.Return, FnDesc.Notes);
						else
							-- Multiple function overloads
							for k, desc in ipairs(FnDesc) do
								AddFunction(func.Name, desc.Params, desc.Return, desc.Notes);
							end  -- for k, desc - FnDesc[]
						end
						FnDesc.IsExported = true;
					end
				end  -- for j, func
				
				-- Replace functions with their described and overload-expanded versions:
				cls.Functions = DoxyFunctions;
			else  -- if (APIDesc.Functions ~= nil)
				for j, func in ipairs(cls.Functions) do
					local FnName = func.DocID or func.Name;
					if not(IsFunctionIgnored(cls.Name, FnName)) then
						table.insert(cls.UndocumentedFunctions, FnName);
					end
				end
			end  -- if (APIDesc.Functions ~= nil)
			
			if (APIDesc.Constants ~= nil) then
				-- Assign constant descriptions:
				for j, cons in ipairs(cls.Constants) do
					local CnDesc = APIDesc.Constants[cons.Name];
					if (CnDesc == nil) then
						-- Not documented
						if not(IsConstantIgnored(cls.Name .. "." .. cons.Name)) then
							table.insert(cls.UndocumentedConstants, cons.Name);
						end
					else
						cons.Notes = CnDesc.Notes;
						CnDesc.IsExported = true;
					end
				end  -- for j, cons
			else  -- if (APIDesc.Constants ~= nil)
				for j, cons in ipairs(cls.Constants) do
					if not(IsConstantIgnored(cls.Name .. "." .. cons.Name)) then
						table.insert(cls.UndocumentedConstants, cons.Name);
					end
				end
			end  -- else if (APIDesc.Constants ~= nil)
			
			-- Assign member variables' descriptions:
			if (APIDesc.Variables ~= nil) then
				for j, var in ipairs(cls.Variables) do
					local VarDesc = APIDesc.Variables[var.Name];
					if (VarDesc == nil) then
						-- Not documented
						if not(IsVariableIgnored(cls.Name .. "." .. var.Name)) then
							table.insert(cls.UndocumentedVariables, var.Name);
						end
					else
						-- Copy all documentation:
						for k, v in pairs(VarDesc) do
							var[k] = v
						end
					end
				end  -- for j, var
			else  -- if (APIDesc.Variables ~= nil)
				for j, var in ipairs(cls.Variables) do
					if not(IsVariableIgnored(cls.Name .. "." .. var.Name)) then
						table.insert(cls.UndocumentedVariables, var.Name);
					end
				end
			end  -- else if (APIDesc.Variables ~= nil)
			
			if (APIDesc.ConstantGroups ~= nil) then
				-- Create links between the constants and the groups:
				local NumInGroups = 0;
				local NumInDescendantGroups = 0;
				for j, group in pairs(APIDesc.ConstantGroups) do
					group.Name = j;
					group.Constants = {};
					if (type(group.Include) == "string") then
						group.Include = { group.Include };
					end
					local NumInGroup = 0;
					for idx, incl in ipairs(group.Include or {}) do
						for cidx, cons in ipairs(cls.Constants) do
							if ((cons.Group == nil) and cons.Name:match(incl)) then
								cons.Group = group;
								table.insert(group.Constants, cons);
								NumInGroup = NumInGroup + 1;
							end
						end  -- for cidx - cls.Constants[]
					end  -- for idx - group.Include[]
					NumInGroups = NumInGroups + NumInGroup;
					if (group.ShowInDescendants) then
						NumInDescendantGroups = NumInDescendantGroups + NumInGroup;
					end
					
					-- Sort the constants:
					table.sort(group.Constants,
						function(c1, c2)
							return (c1.Name < c2.Name);
						end
					);
				end  -- for j - APIDesc.ConstantGroups[]
				cls.ConstantGroups = APIDesc.ConstantGroups;
				cls.NumConstantsInGroups = NumInGroups;
				cls.NumConstantsInGroupsForDescendants = NumInDescendantGroups;
				
				-- Remove grouped constants from the normal list:
				local NewConstants = {};
				for idx, cons in ipairs(cls.Constants) do
					if (cons.Group == nil) then
						table.insert(NewConstants, cons);
					end
				end
				cls.Constants = NewConstants;
			end  -- if (ConstantGroups ~= nil)
			
		else  -- if (APIDesc ~= nil)
		
			-- Class is not documented at all, add all its members to Undocumented lists:
			cls.UndocumentedFunctions = {};
			cls.UndocumentedConstants = {};
			cls.UndocumentedVariables = {};
			cls.Variables = cls.Variables or {};
			g_Stats.NumUndocumentedClasses = g_Stats.NumUndocumentedClasses + 1;
			for j, func in ipairs(cls.Functions) do
				local FnName = func.DocID or func.Name;
				if not(IsFunctionIgnored(cls.Name, FnName)) then
					table.insert(cls.UndocumentedFunctions, FnName);
				end
			end  -- for j, func - cls.Functions[]
			for j, cons in ipairs(cls.Constants) do
				if not(IsConstantIgnored(cls.Name .. "." .. cons.Name)) then
					table.insert(cls.UndocumentedConstants, cons.Name);
				end
			end  -- for j, cons - cls.Constants[]
			for j, var in ipairs(cls.Variables) do
				if not(IsConstantIgnored(cls.Name .. "." .. var.Name)) then
					table.insert(cls.UndocumentedVariables, var.Name);
				end
			end  -- for j, var - cls.Variables[]
		end  -- else if (APIDesc ~= nil)
		
		-- Remove ignored functions:
		local NewFunctions = {};
		for j, fn in ipairs(cls.Functions) do
			if (not(IsFunctionIgnored(cls.Name, fn.Name))) then
				table.insert(NewFunctions, fn);
			end
		end  -- for j, fn
		cls.Functions = NewFunctions;

		-- Sort the functions (they may have been renamed):
		table.sort(cls.Functions,
			function(f1, f2)
				if (f1.Name == f2.Name) then
					-- Same name, either comparing the same function to itself, or two overloads, in which case compare the params
					if ((f1.Params == nil) or (f2.Params == nil)) then
						return 0;
					end
					return (f1.Params < f2.Params);
				end
				return (f1.Name < f2.Name);
			end
		);
		
		-- Remove ignored constants:
		local NewConstants = {};
		for j, cn in ipairs(cls.Constants) do
			if (not(IsFunctionIgnored(cls.Name, cn.Name))) then
				table.insert(NewConstants, cn);
			end
		end  -- for j, cn
		cls.Constants = NewConstants;
		
		-- Sort the constants:
		table.sort(cls.Constants,
			function(c1, c2)
				return (c1.Name < c2.Name);
			end
		);
		
		-- Remove ignored member variables:
		local NewVariables = {};
		for j, var in ipairs(cls.Variables) do
			if (not(IsVariableIgnored(cls.Name .. "." .. var.Name))) then
				table.insert(NewVariables, var);
			end
		end  -- for j, var
		cls.Variables = NewVariables;
		
		-- Sort the member variables:
		table.sort(cls.Variables,
			function(v1, v2)
				return (v1.Name < v2.Name);
			end
		);
	end  -- for i, cls
	
	-- Sort the descendants lists:
	for i, cls in ipairs(a_API) do
		table.sort(cls.Descendants,
			function(c1, c2)
				return (c1.Name < c2.Name);
			end
		);
	end  -- for i, cls
end





function ReadHooks(a_Hooks)
	--[[
	a_Hooks = {
		{ Name = "HOOK_1"},
		{ Name = "HOOK_2"},
		...
	};
	We want to add hook descriptions to each hook in this array
	--]]
	for i, hook in ipairs(a_Hooks) do
		local HookDesc = g_APIDesc.Hooks[hook.Name];
		if (HookDesc ~= nil) then
			for key, val in pairs(HookDesc) do
				hook[key] = val;
			end
		end
	end  -- for i, hook - a_Hooks[]
	g_Stats.NumTotalHooks = #a_Hooks;
end





-- Make a link out of anything with the special linkifying syntax {{link|title}}
function LinkifyString(a_String, a_Referrer)
	assert(a_Referrer ~= nil);
	assert(a_Referrer ~= "");
	
	--- Adds a page to the list of tracked pages (to be checked for existence at the end)
	local function AddTrackedPage(a_PageName)
		local Pg = (g_TrackedPages[a_PageName] or {});
		table.insert(Pg, a_Referrer);
		g_TrackedPages[a_PageName] = Pg;
	end
	
	--- Creates the HTML for the specified link and title
	local function CreateLink(Link, Title)
		if (Link:sub(1, 7) == "http://") then
			-- The link is a full absolute URL, do not modify, do not track:
			return "<a href=\"" .. Link .. "\">" .. Title .. "</a>";
		end
		local idxHash = Link:find("#");
		if (idxHash ~= nil) then
			-- The link contains an anchor:
			if (idxHash == 1) then
				-- Anchor in the current page, no need to track:
				return "<a href=\"" .. Link .. "\">" .. Title .. "</a>";
			end
			-- Anchor in another page:
			local PageName = Link:sub(1, idxHash - 1);
			AddTrackedPage(PageName);
			return "<a href=\"" .. PageName .. ".html#" .. Link:sub(idxHash + 1) .. "\">" .. Title .. "</a>";
		end
		-- Link without anchor:
		AddTrackedPage(Link);
		return "<a href=\"" .. Link .. ".html\">" .. Title .. "</a>";
	end
	
	-- Linkify the strings using the CreateLink() function:
	local txt = a_String:gsub("{{([^|}]*)|([^}]*)}}", CreateLink)  -- {{link|title}}
	txt = txt:gsub("{{([^|}]*)}}",  -- {{LinkAndTitle}}
		function(LinkAndTitle)
			local idxHash = LinkAndTitle:find("#");
			if (idxHash ~= nil) then
				-- The LinkAndTitle contains a hash, remove the hashed part from the title:
				return CreateLink(LinkAndTitle, LinkAndTitle:sub(1, idxHash - 1));
			end
			return CreateLink(LinkAndTitle, LinkAndTitle);
		end
	);
	return txt;
end





function WriteHtmlClass(a_ClassAPI, a_AllAPI)
	local cf, err = io.open("API/" .. a_ClassAPI.Name .. ".html", "w");
	if (cf == nil) then
		return;
	end
	
	-- Writes a table containing all functions in the specified list, with an optional "inherited from" header when a_InheritedName is valid
	local function WriteFunctions(a_Functions, a_InheritedName)
		if (#a_Functions == 0) then
			return;
		end

		if (a_InheritedName ~= nil) then
			cf:write("<h2>Functions inherited from ", a_InheritedName, "</h2>\n");
		end
		cf:write("<table>\n<tr><th>Name</th><th>Parameters</th><th>Return value</th><th>Notes</th></tr>\n");
		for i, func in ipairs(a_Functions) do
			cf:write("<tr><td>", func.Name, "</td>\n");
			cf:write("<td>", LinkifyString(func.Params or "", (a_InheritedName or a_ClassAPI.Name)), "</td>\n");
			cf:write("<td>", LinkifyString(func.Return or "", (a_InheritedName or a_ClassAPI.Name)), "</td>\n");
			cf:write("<td>", LinkifyString(func.Notes or "<i>(undocumented)</i>", (a_InheritedName or a_ClassAPI.Name)), "</td></tr>\n");
		end
		cf:write("</table>\n");
	end
	
	local function WriteConstantTable(a_Constants, a_Source)
		cf:write("<table>\n<tr><th>Name</th><th>Value</th><th>Notes</th></tr>\n");
		for i, cons in ipairs(a_Constants) do
			cf:write("<tr><td>", cons.Name, "</td>\n");
			cf:write("<td>", cons.Value, "</td>\n");
			cf:write("<td>", LinkifyString(cons.Notes or "", a_Source), "</td></tr>\n");
		end
		cf:write("</table>\n\n");
	end
	
	local function WriteConstants(a_Constants, a_ConstantGroups, a_NumConstantGroups, a_InheritedName)
		if ((#a_Constants == 0) and (a_NumConstantGroups == 0)) then
			return;
		end
		
		local Source = a_ClassAPI.Name
		if (a_InheritedName ~= nil) then
			cf:write("<h2>Constants inherited from ", a_InheritedName, "</h2>\n");
			Source = a_InheritedName;
		end
		
		if (#a_Constants > 0) then
			WriteConstantTable(a_Constants, Source);
		end
		
		for k, group in pairs(a_ConstantGroups) do
			if ((a_InheritedName == nil) or group.ShowInDescendants) then
				cf:write("<a name='", group.Name, "'><p>");
				cf:write(LinkifyString(group.TextBefore or "", Source));
				WriteConstantTable(group.Constants, a_InheritedName or a_ClassAPI.Name);
				cf:write(LinkifyString(group.TextAfter or "", Source), "</a></p>");
			end
		end
	end
	
	local function WriteVariables(a_Variables, a_InheritedName)
		if (#a_Variables == 0) then
			return;
		end
		
		if (a_InheritedName ~= nil) then
			cf:write("<h2>Member variables inherited from ", a_InheritedName, "</h2>\n");
		end
		
		cf:write("<table><tr><th>Name</th><th>Type</th><th>Notes</th></tr>\n");
		for i, var in ipairs(a_Variables) do
			cf:write("<tr><td>", var.Name, "</td>\n");
			cf:write("<td>", LinkifyString(var.Type or "<i>(undocumented)</i>", a_InheritedName or a_ClassAPI.Name), "</td>\n");
			cf:write("<td>", LinkifyString(var.Notes or "", a_InheritedName or a_ClassAPI.Name), "</td>\n				</tr>\n");
		end
		cf:write("</table>\n\n");
	end
	
	local function WriteDescendants(a_Descendants)
		if (#a_Descendants == 0) then
			return;
		end
		cf:write("<ul>");
		for i, desc in ipairs(a_Descendants) do
			cf:write("<li><a href=\"", desc.Name, ".html\">", desc.Name, "</a>");
			WriteDescendants(desc.Descendants);
			cf:write("</li>\n");
		end
		cf:write("</ul>\n");
	end
	
	local ClassName = a_ClassAPI.Name;

	-- Build an array of inherited classes chain:
	local InheritanceChain = {};
	local CurrInheritance = a_ClassAPI.Inherits;
	while (CurrInheritance ~= nil) do
		table.insert(InheritanceChain, CurrInheritance);
		CurrInheritance = CurrInheritance.Inherits;
	end
	
	cf:write([[<!DOCTYPE html><html>
		<head>
		<title>MCServer API - ]], a_ClassAPI.Name, [[ Class</title>
		<link rel="stylesheet" type="text/css" href="main.css" />
		<link rel="stylesheet" type="text/css" href="prettify.css" />
		<script src="prettify.js"></script>
		<script src="lang-lua.js"></script>
		</head>
		<body>
		<div id="content">
		<header>
		<h1>]], a_ClassAPI.Name, [[</h1>
		<hr />
		</header>
		<h1>Contents</h1>
		<p><ul>
	]]);
	
	local HasInheritance = ((#a_ClassAPI.Descendants > 0) or (a_ClassAPI.Inherits ~= nil));
	
	local HasConstants = (#a_ClassAPI.Constants > 0) or (a_ClassAPI.NumConstantsInGroups > 0);
	local HasFunctions = (#a_ClassAPI.Functions > 0);
	local HasVariables = (#a_ClassAPI.Variables > 0);
	for idx, cls in ipairs(InheritanceChain) do
		HasConstants = HasConstants or (#cls.Constants > 0) or (cls.NumConstantsInGroupsForDescendants > 0);
		HasFunctions = HasFunctions or (#cls.Functions > 0);
		HasVariables = HasVariables or (#cls.Variables > 0);
	end
	
	-- Write the table of contents:
	if (HasInheritance) then
		cf:write("<li><a href=\"#inherits\">Inheritance</a></li>\n");
	end
	if (HasConstants) then
		cf:write("<li><a href=\"#constants\">Constants</a></li>\n");
	end
	if (HasVariables) then
		cf:write("<li><a href=\"#variables\">Member variables</a></li>\n");
	end
	if (HasFunctions) then
		cf:write("<li><a href=\"#functions\">Functions</a></li>\n");
	end
	if (a_ClassAPI.AdditionalInfo ~= nil) then
		for i, additional in ipairs(a_ClassAPI.AdditionalInfo) do
			cf:write("<li><a href=\"#additionalinfo_", i, "\">", (additional.Header or "<i>(No header)</i>"), "</a></li>\n");
		end
	end
	cf:write("</ul></p>\n");
	
	-- Write the class description:
	cf:write("<hr /><a name=\"desc\"><h1>", ClassName, " class</h1></a>\n");
	if (a_ClassAPI.Desc ~= nil) then
		cf:write("<p>");
		cf:write(LinkifyString(a_ClassAPI.Desc, ClassName));
		cf:write("</p>\n\n");
	end;
	
	-- Write the inheritance, if available:
	if (HasInheritance) then
		cf:write("<hr /><a name=\"inherits\"><h1>Inheritance</h1></a>\n");
		if (#InheritanceChain > 0) then
			cf:write("<p>This class inherits from the following parent classes:<ul>\n");
			for i, cls in ipairs(InheritanceChain) do
				cf:write("<li><a href=\"", cls.Name, ".html\">", cls.Name, "</a></li>\n");
			end
			cf:write("</ul></p>\n");
		end
		if (#a_ClassAPI.Descendants > 0) then
			cf:write("<p>This class has the following descendants:\n");
			WriteDescendants(a_ClassAPI.Descendants);
			cf:write("</p>\n\n");
		end
	end
	
	-- Write the constants:
	if (HasConstants) then
		cf:write("<a name=\"constants\"><hr /><h1>Constants</h1></a>\n");
		WriteConstants(a_ClassAPI.Constants, a_ClassAPI.ConstantGroups, a_ClassAPI.NumConstantsInGroups, nil);
		g_Stats.NumTotalConstants = g_Stats.NumTotalConstants  + #a_ClassAPI.Constants + (a_ClassAPI.NumConstantsInGroups or 0);
		for i, cls in ipairs(InheritanceChain) do
			WriteConstants(cls.Constants, cls.ConstantGroups, cls.NumConstantsInGroupsForDescendants, cls.Name);
		end;
	end;
	
	-- Write the member variables:
	if (HasVariables) then
		cf:write("<a name=\"variables\"><hr /><h1>Member variables</h1></a>\n");
		WriteVariables(a_ClassAPI.Variables, nil);
		g_Stats.NumTotalVariables = g_Stats.NumTotalVariables + #a_ClassAPI.Variables;
		for i, cls in ipairs(InheritanceChain) do
			WriteVariables(cls.Variables, cls.Name);
		end;
	end
	
	-- Write the functions, including the inherited ones:
	if (HasFunctions) then
		cf:write("<a name=\"functions\"><hr /><h1>Functions</h1></a>\n");
		WriteFunctions(a_ClassAPI.Functions, nil);
		g_Stats.NumTotalFunctions = g_Stats.NumTotalFunctions + #a_ClassAPI.Functions;
		for i, cls in ipairs(InheritanceChain) do
			WriteFunctions(cls.Functions, cls.Name);
		end
	end
	
	-- Write the additional infos:
	if (a_ClassAPI.AdditionalInfo ~= nil) then
		for i, additional in ipairs(a_ClassAPI.AdditionalInfo) do
			cf:write("<a name=\"additionalinfo_", i, "\"><h1>", additional.Header, "</h1></a>\n");
			cf:write(LinkifyString(additional.Contents, ClassName));
		end
	end

	cf:write([[</div><script>prettyPrint();</script></body></html>]]);
	cf:close();
end





function WriteHtmlHook(a_Hook)
	local fnam = "API/" .. a_Hook.DefaultFnName .. ".html";
	local f, error = io.open(fnam, "w");
	if (f == nil) then
		LOG("Cannot write \"" .. fnam .. "\": \"" .. error .. "\".");
		return;
	end
	local HookName = a_Hook.DefaultFnName;
	
	f:write([[<!DOCTYPE html><html>
		<head>
		<title>MCServer API - ]], HookName, [[ Hook</title>
		<link rel="stylesheet" type="text/css" href="main.css" />
		<link rel="stylesheet" type="text/css" href="prettify.css" />
		<script src="prettify.js"></script>
		<script src="lang-lua.js"></script>
		</head>
		<body>
		<div id="content">
		<header>
		<h1>]], a_Hook.Name, [[</h1>
		<hr />
		</header>
		<p>
	]]);
	f:write(LinkifyString(a_Hook.Desc, HookName));
	f:write("</p>\n<hr /><h1>Callback function</h1>\n<p>The default name for the callback function is ");
	f:write(a_Hook.DefaultFnName, ". It has the following signature:\n");
	f:write("<pre class=\"prettyprint lang-lua\">function ", HookName, "(");
	if (a_Hook.Params == nil) then
		a_Hook.Params = {};
	end
	for i, param in ipairs(a_Hook.Params) do
		if (i > 1) then
			f:write(", ");
		end
		f:write(param.Name);
	end
	f:write(")</pre>\n<hr /><h1>Parameters:</h1>\n<table><tr><th>Name</th><th>Type</th><th>Notes</th></tr>\n");
	for i, param in ipairs(a_Hook.Params) do
		f:write("<tr><td>", param.Name, "</td><td>", LinkifyString(param.Type, HookName), "</td><td>", LinkifyString(param.Notes, HookName), "</td></tr>\n");
	end
	f:write("</table>\n<p>" .. (a_Hook.Returns or "") .. "</p>\n\n");
	f:write([[<hr /><h1>Code examples</h1><h2>Registering the callback</h2>]]);
	f:write("<pre class=\"prettyprint lang-lua\">\n");
	f:write([[cPluginManager.AddHook(cPluginManager.]] .. a_Hook.Name .. ", My" .. a_Hook.DefaultFnName .. [[);]]);
	f:write("</pre>\n\n");
	local Examples = a_Hook.CodeExamples or {};
	for i, example in ipairs(Examples) do
		f:write("<h2>", (example.Title or "<i>missing Title</i>"), "</h2>\n");
		f:write("<p>", (example.Desc or "<i>missing Desc</i>"), "</p>\n");
		f:write("<pre class=\"prettyprint lang-lua\">", (example.Code or "<i>missing Code</i>"), "\n</pre>\n\n");
	end
	f:write([[</div><script>prettyPrint();</script></body></html>]]);
	f:close();
end





--- Writes a list of undocumented objects into a file
function ListUndocumentedObjects(API, UndocumentedHooks)
	f = io.open("API/_undocumented.lua", "w");
	if (f ~= nil) then
		f:write("\n-- This is the list of undocumented API objects, automatically generated by APIDump\n\n");
		f:write("g_APIDesc =\n{\n\tClasses =\n\t{\n");
		for i, cls in ipairs(API) do
			local HasFunctions = ((cls.UndocumentedFunctions ~= nil) and (#cls.UndocumentedFunctions > 0));
			local HasConstants = ((cls.UndocumentedConstants ~= nil) and (#cls.UndocumentedConstants > 0));
			local HasVariables = ((cls.UndocumentedVariables ~= nil) and (#cls.UndocumentedVariables > 0));
			g_Stats.NumUndocumentedFunctions = g_Stats.NumUndocumentedFunctions + #cls.UndocumentedFunctions;
			g_Stats.NumUndocumentedConstants = g_Stats.NumUndocumentedConstants + #cls.UndocumentedConstants;
			g_Stats.NumUndocumentedVariables = g_Stats.NumUndocumentedVariables + #cls.UndocumentedVariables;
			if (HasFunctions or HasConstants or HasVariables) then
				f:write("\t\t" .. cls.Name .. " =\n\t\t{\n");
				if ((cls.Desc == nil) or (cls.Desc == "")) then
					f:write("\t\t\tDesc = \"\"\n");
				end
			end
			
			if (HasFunctions) then
				f:write("\t\t\tFunctions =\n\t\t\t{\n");
				table.sort(cls.UndocumentedFunctions);
				for j, fn in ipairs(cls.UndocumentedFunctions) do
					f:write("\t\t\t\t" .. fn .. " = { Params = \"\", Return = \"\", Notes = \"\" },\n");
				end  -- for j, fn - cls.UndocumentedFunctions[]
				f:write("\t\t\t},\n\n");
			end
			
			if (HasConstants) then
				f:write("\t\t\tConstants =\n\t\t\t{\n");
				table.sort(cls.UndocumentedConstants);
				for j, cn in ipairs(cls.UndocumentedConstants) do
					f:write("\t\t\t\t" .. cn .. " = { Notes = \"\" },\n");
				end  -- for j, fn - cls.UndocumentedConstants[]
				f:write("\t\t\t},\n\n");
			end
			
			if (HasVariables) then
				f:write("\t\t\tVariables =\n\t\t\t{\n");
				table.sort(cls.UndocumentedVariables);
				for j, vn in ipairs(cls.UndocumentedVariables) do
					f:write("\t\t\t\t" .. vn .. " = { Type = \"\", Notes = \"\" },\n");
				end  -- for j, fn - cls.UndocumentedVariables[]
				f:write("\t\t\t},\n\n");
			end
			
			if (HasFunctions or HasConstants or HasVariables) then
				f:write("\t\t},\n\n");
			end
		end  -- for i, cls - API[]
		f:write("\t},\n");
		
		if (#UndocumentedHooks > 0) then
			f:write("\n\tHooks =\n\t{\n");
			for i, hook in ipairs(UndocumentedHooks) do
				if (i > 1) then
					f:write("\n");
				end
				f:write("\t\t" .. hook .. " =\n\t\t{\n");
				f:write("\t\t\tCalledWhen = \"\",\n");
				f:write("\t\t\tDefaultFnName = \"On\",  -- also used as pagename\n");
				f:write("\t\t\tDesc = [[\n\t\t\t\t\n\t\t\t]],\n");
				f:write("\t\t\tParams =\n\t\t\t{\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t\t{ Name = \"\", Type = \"\", Notes = \"\" },\n");
				f:write("\t\t\t},\n");
				f:write("\t\t\tReturns = [[\n\t\t\t\t\n\t\t\t]],\n");
				f:write("\t\t},  -- " .. hook .. "\n");
			end
			f:write("\t},\n");
		end
		f:write("}\n\n\n\n");
		f:close();
	end
	g_Stats.NumUndocumentedHooks = #UndocumentedHooks;
end





--- Lists the API objects that are documented but not available in the API:
function ListUnexportedObjects()
	f = io.open("API/_unexported-documented.txt", "w");
	if (f ~= nil) then
		for clsname, cls in pairs(g_APIDesc.Classes) do
			if not(cls.IsExported) then
				-- The whole class is not exported
				f:write("class\t" .. clsname .. "\n");
			else
				if (cls.Functions ~= nil) then
					for fnname, fnapi in pairs(cls.Functions) do
						if not(fnapi.IsExported) then
							f:write("func\t" .. clsname .. "." .. fnname .. "\n");
						end
					end  -- for j, fn - cls.Functions[]
				end
				if (cls.Constants ~= nil) then
					for cnname, cnapi in pairs(cls.Constants) do
						if not(cnapi.IsExported) then
							f:write("const\t" .. clsname .. "." .. cnname .. "\n");
						end
					end  -- for j, fn - cls.Functions[]
				end
			end
		end  -- for i, cls - g_APIDesc.Classes[]
		f:close();
	end
end





function ListMissingPages()
	local MissingPages = {};
	local NumLinks = 0;
	for PageName, Referrers in pairs(g_TrackedPages) do
		NumLinks = NumLinks + 1;
		if not(cFile:Exists("API/" .. PageName .. ".html")) then
			table.insert(MissingPages, {Name = PageName, Refs = Referrers} );
		end
	end;
	g_Stats.NumTrackedLinks = NumLinks;
	g_TrackedPages = {};
	
	if (#MissingPages == 0) then
		-- No missing pages, congratulations!
		return;
	end
	
	-- Sort the pages by name:
	table.sort(MissingPages,
		function (Page1, Page2)
			return (Page1.Name < Page2.Name);
		end
	);
	
	-- Output the pages:
	local f, err = io.open("API/_missingPages.txt", "w");
	if (f == nil) then
		LOGWARNING("Cannot open _missingPages.txt for writing: '" .. err .. "'. There are " .. #MissingPages .. " pages missing.");
		return;
	end
	for idx, pg in ipairs(MissingPages) do
		f:write(pg.Name .. ":\n");
		-- Sort and output the referrers:
		table.sort(pg.Refs);
		f:write("\t" .. table.concat(pg.Refs, "\n\t"));
		f:write("\n\n");
	end
	f:close();
	g_Stats.NumInvalidLinks = #MissingPages;
end





--- Writes the documentation statistics (in g_Stats) into the given HTML file
function WriteStats(f)
	local function ExportMeter(a_Percent)
		local Color;
		if (a_Percent > 99) then
			Color = "green";
		elseif (a_Percent > 50) then
			Color = "orange";
		else
			Color = "red";
		end
		
		local meter = {
			"\n",
			"<div style=\"background-color: black; padding: 1px; width: 100px\">\n",
			"<div style=\"background-color: ",
			Color,
			"; width: ",
			a_Percent,
			"%; height: 16px\"></div></div>\n</td><td>",
			string.format("%.2f", a_Percent),
			" %",
		};
		return table.concat(meter, "");
	end
	
	f:write([[
		<hr /><a name="docstats"><h2>Documentation statistics</h2></a>
		<table><tr><th>Object</th><th>Total</th><th>Documented</th><th>Undocumented</th><th colspan="2">Documented %</th></tr>
	]]);
	f:write("<tr><td>Classes</td><td>", g_Stats.NumTotalClasses);
	f:write("</td><td>", g_Stats.NumTotalClasses - g_Stats.NumUndocumentedClasses);
	f:write("</td><td>", g_Stats.NumUndocumentedClasses);
	f:write("</td><td>", ExportMeter(100 * (g_Stats.NumTotalClasses - g_Stats.NumUndocumentedClasses) / g_Stats.NumTotalClasses));
	f:write("</td></tr>\n");

	f:write("<tr><td>Functions</td><td>", g_Stats.NumTotalFunctions);
	f:write("</td><td>", g_Stats.NumTotalFunctions - g_Stats.NumUndocumentedFunctions);
	f:write("</td><td>", g_Stats.NumUndocumentedFunctions);
	f:write("</td><td>", ExportMeter(100 * (g_Stats.NumTotalFunctions - g_Stats.NumUndocumentedFunctions) / g_Stats.NumTotalFunctions));
	f:write("</td></tr>\n");

	f:write("<tr><td>Member variables</td><td>", g_Stats.NumTotalVariables);
	f:write("</td><td>", g_Stats.NumTotalVariables - g_Stats.NumUndocumentedVariables);
	f:write("</td><td>", g_Stats.NumUndocumentedVariables);
	f:write("</td><td>", ExportMeter(100 * (g_Stats.NumTotalVariables - g_Stats.NumUndocumentedVariables) / g_Stats.NumTotalVariables));
	f:write("</td></tr>\n");

	f:write("<tr><td>Constants</td><td>", g_Stats.NumTotalConstants);
	f:write("</td><td>", g_Stats.NumTotalConstants - g_Stats.NumUndocumentedConstants);
	f:write("</td><td>", g_Stats.NumUndocumentedConstants);
	f:write("</td><td>", ExportMeter(100 * (g_Stats.NumTotalConstants - g_Stats.NumUndocumentedConstants) / g_Stats.NumTotalConstants));
	f:write("</td></tr>\n");
	
	f:write("<tr><td>Hooks</td><td>", g_Stats.NumTotalHooks);
	f:write("</td><td>", g_Stats.NumTotalHooks - g_Stats.NumUndocumentedHooks);
	f:write("</td><td>", g_Stats.NumUndocumentedHooks);
	f:write("</td><td>", ExportMeter(100 * (g_Stats.NumTotalHooks - g_Stats.NumUndocumentedHooks) / g_Stats.NumTotalHooks));
	f:write("</td></tr>\n");
	
	f:write([[
		</table>
		<p>There are ]], g_Stats.NumTrackedLinks, " internal links, ", g_Stats.NumInvalidLinks, " of them are invalid.</p>"
	);
end