const convert = require( 'color-convert' );
const fs = require( 'fs' );
const path = require( 'path' );

/**
 * Recursively find all files with extension in a directory
 * @param {string} dir The directory to search. Either absolute or relative path
 * @param {string} extension The file extension to look for
 * @returns {string[]} returns a list of html files with their full path
 */
const treeWalker = ( dir, extension, ignoreList ) => {
    const ls = fs.readdirSync( dir );
    const fileList = [];
    for ( let file in ls ) {
        if ( fs.statSync( path.join( dir, ls[ file ] ) ).isDirectory() ) {
            // Filter ignored directories
            if ( ignoreList === undefined || !ignoreList.includes( ls[ file ] ) ) {
                const newFiles = treeWalker( path.join( dir, ls[ file ] ), extension, ignoreList );
                for (let file = 0; file < newFiles.length; file++) {
                    fileList.push( newFiles[ file ] );
                }
            }
        } else if ( extension == '*' || ls[ file ].includes( extension ) ) {
            if ( ignoreList === undefined || !ignoreList.includes( ls[ file ] ) ) {
                fileList.push( path.join( dir, ls[ file ] ) );
            }
        }
    }

    return fileList;
}

const renderColourAsHex = ( colour ) => {
    return '#' + convert.default.rgb.hex( colour[ 0 ], colour[ 1 ], colour[ 2 ] );
}

const renderColourAsRGB = ( colour ) => {
    return `rgb( ${ colour[ 0 ] }, ${ colour[ 1 ] }, ${ colour[ 2 ] } )`
}

const renderColourAsRGBA = ( colour, ambiance ) => {
    return `rgba( ${ colour[ 0 ] }, ${ colour[ 1 ] }, ${ colour[ 2 ] }, ${ ambiance } )`
}

/*
 * Replace the colours with variable names
 * #000 = @bg
 * #111 = @bg_accent
 * #222 = @bg_inactive
 * #555A = @shadow_rgba
 * #555 = @shadow
 * #F00 = @accent
 * #0F0 = @accent2
 * #00F = @accent3
 * #AAA = @inactive
 * #FFF = @fg
 */
const replacements = { 
    '#000': '@bg',
    '#111': '@bg_accent',
    '#222': '@bg_inactive',
    '#555A': '@shadow_rgba',
    '#555': '@shadow',
    '#F00': '@accent',
    '#0F0': '@accent2',
    '#00F': '@accent3',
    '#AAA': '@inactive',
    '#FFF': '@fg'
};
const themePreProcessor = ( file, replacement ) => {
    const colours = Object.keys( replacements );
    let data = '' + fs.readFileSync( file );
    for (let index = 0; index < colours.length; index++) {
        const colour = colours[index];
        data = data.replaceAll(colour, replacements[ colour ]);
    }
    
    const outPath = file.replace( replacement, 'temp' );
    try {
        fs.mkdirSync( path.dirname( outPath ), {
            recursive: true,
        } );
    } catch ( e ) {
        console.error( e );
    }

    fs.writeFileSync( outPath, data );
}

module.exports = {
    treeWalker,
    renderColourAsHex,
    renderColourAsRGB,
    renderColourAsRGBA,
    themePreProcessor
}