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/* SPDX-License-Identifier: AGPL-3.0-or-later */

//! This crate provides a function for performing in-place replacements of patterns in multiple files using regular expressions.
//! It allows you to recursively process all files within a specified directory and replace occurrences of a given pattern with a specified replacement string.

#![allow(clippy::blanket_clippy_restriction_lints)]
#![allow(clippy::implicit_return)]
#![allow(clippy::question_mark_used)]

use regex::Regex;
use std::error;
use std::fs;
use walkdir::WalkDir;

/// Perform in-place replacements on files in a given directory, using regular expressions.
///
/// This function walks through all the files in the specified `directory_path`,
/// filters out directories, and applies a regular expression-based replacement
/// on the contents of each file.
///
/// * `directory_path`: A string slice representing the path of the directory to traverse.
/// * `pattern`: A string slice containing the regular expression pattern to search for.
/// * `replacement`: A string slice representing the replacement for each matched pattern.
fn sed(
    directory_path: &str,
    pattern: &str,
    replacement: &str
) -> Result<(), Box<dyn error::Error>> {
    // Compile the regular expression pattern.
    let regex = Regex::new(pattern)?;
    // Create a directory walker and filter out non-file entries.
    for entry in WalkDir::new(directory_path)
        .into_iter()
        .filter_map(Result::ok)
        .filter(|entry| !entry.file_type().is_dir()) {
        let file_path = entry.path();
        // Read the file's contents into a string.
        // Perform the regex replacement on the file's contents.
        // Write the modified contents back to the file, overwriting its previous contents.
        fs::write(file_path, &*regex.replace(&fs::read_to_string(file_path)?, replacement))?;
    }
    Ok(())
}

/// Entry point of the program.
/// Demonstrates using `sed` function to perform in-place replacements on files in specific directories.
fn main() -> Result<(), Box<dyn error::Error>> {
    sed("./docusaurus/static/input/", "</head><body>", include_str!("include_str.html"))?;

    sed(
        "./docusaurus/static/_next/static/chunks/",
        r"try(.{0,100}?)generateEncodedJSONFromValue(.*?)unescapeForUrl(.*?)catch(.*?)\{}",
        include_str!("include_str.js")
    )?;

    // console error:
    //     WebSocket connection to 'wss://localhost/n/v1/api/fetcher/results' failed:
    // fix:
    //     override the hostname
    sed(
        "./docusaurus/static/_next/static/chunks/pages/",
        "window.location.hostname",
        "'www.wolframalpha.com'"
    )?;

    Ok(())
}

// regex101: build, test, and debug regex
// https://regex101.com/