const mustache = require( 'mustache' );
const colorThief = require( '@janishutz/colorthief' );
const fs = require( 'fs' );
const path = require( 'path' );
const util = require( './util' );
const renderColourAsRGB = util.renderColourAsRGB;
const renderColourAsRGBA = util.renderColourAsRGBA;
const renderColourAsHex = util.renderColourAsHex;

const build = ( wallpaper, lockpaper, theme ) => {
    console.log( '\n=> Extracting colours' );
    // Extract colour palette from chosen wallpaper using Color-Thief
    colorThief.getPalette( wallpaper ).then( palette => {
        // Define view options (for rendering with mustache)
        const view = {
            'wallpaper-path': wallpaper,
            'lockpaper-path': lockpaper,

            // Colours
            'colour-foreground-hex': renderColourAsHex( colours.foreground[ theme ] ),
            'colour-foreground-rgb': renderColourAsRGB( colours.foreground[ theme ] ),
            'colour-foreground-rgba': renderColourAsRGBA( colours.foreground[ theme ], 0.5 ),
            'colour-accent-hex': renderColourAsHex( palette[ 0 ] ),
            'colour-accent-rgb': renderColourAsRGB( palette[ 0 ] ),
            'colour-accent-rgba': renderColourAsRGBA( palette[ 0 ], 0.3 ),
            'colour-accent-2-hex': renderColourAsHex( palette[ 1 ] ),
            'colour-accent-2-rgb': renderColourAsRGB( palette[ 1 ] ),
            'colour-accent-3-hex': renderColourAsHex( palette[ 2 ] ),
            'colour-accent-3-rgb': renderColourAsRGB( palette[ 2 ] ),
            'colour-background-hex': renderColourAsHex( colours.background[ theme ] ),
            'colour-background-rgb': renderColourAsRGB( colours.background[ theme ] ),
            'colour-background-rgba': renderColourAsRGBA( colours.background[ theme ], 0.5 ),
            'colour-background-alternative-hex': renderColourAsHex( colours[ 'background-alternative' ][ theme ] ),
            'colour-background-alternative-hex': renderColourAsRGB( colours[ 'background-alternative' ][ theme ] ),
            'colour-shadow-hex': renderColourAsHex( colours.shadow[ theme ] ),
            'colour-shadow-rgb': renderColourAsRGB( colours.shadow[ theme ] ),
            'colour-shadow-rgba': renderColourAsRGBA( colours.shadow[ theme ], 0.3 ),
            'colour-inactive-hex': renderColourAsHex( colours.inactive[ theme ] ),
            'colour-inactive-rgb': renderColourAsRGB( colours.inactive[ theme ] ),
            'colour-inactive-background-hex': renderColourAsHex( colours[ 'inactive-background' ][ theme ] ),
            'colour-inactive-background-rgb': renderColourAsRGB( colours[ 'inactive-background' ][ theme ] ),

            // Fonts
            'font-primary': fonts.primary[ theme ],
            'font-accent': fonts.accent[ theme ],
            'font-mono': fonts.mono[ theme ],

            // yazi theme
            'yazi-theme': yaziThemes[ theme ],

            // Path to this repo on disk
            'path-to-dotfiles': __dirname.slice(0, __dirname.length - 5),
        }

        try {
            fs.mkdir( path.join( __dirname, '/dist' ) );
        } catch ( e ) {

        }

        // recursively index files from config directory -> Maybe add a file to each
        // directory to indicate whether or not to index files in it?
        const fileList = util.treeWalker( path.join( __dirname, '/../renderable/' ), '*', [ 'node_modules', '@girs', '.gitignore', '.git', 'flavours' ] );

        for (let index = 0; index < fileList.length; index++) {
            try {
                render( fileList[ index ], view );
            } catch ( e ) {
                console.error( '=> Render failed for ' + fileList[ index ] + ' with error ' + e );
            }
        }

        util.themePreProcessor( path.join( __dirname, '/../gtk-theme/src/gtk-4.0/gtk.css' ), 'src' );
        util.themePreProcessor( path.join( __dirname, '/../gtk-theme/src/gtk-3.0/gtk.css' ), 'src' );
        render( path.join( __dirname, '/../gtk-theme/temp/gtk-3.0/gtk.css' ), view, 'temp', 'dist' );
        render( path.join( __dirname, '/../gtk-theme/temp/gtk-4.0/gtk.css' ), view, 'temp', 'dist' );
        // TODO: Copy over to /usr/share/themes/Adaptive-Theme/
    } ).catch( e => {
        console.error( e );
        console.error( '\n=> Failed to load image or retrieve colour palette from it' );
    } );
}

const colours = {
    foreground: {
        'nordic': [ 10, 220, 255 ],
        'deep-dark': [ 230, 230, 230 ],
        'material': [ 255, 255, 255 ], // TODO: Will be calculated by material theme generator
        'light': [ 40, 40, 40 ],
        'bright': [ 0, 0, 0 ]
    },
    background: {
        'nordic': [ 10, 0, 50 ],
        'deep-dark': [ 20, 20, 20 ],
        'material': [ 30, 30, 30 ], // TODO: Will be calculated by material theme generator
        'light': [ 230, 230, 230 ],
        'bright': [ 255, 255, 255 ]
    },
    'background-alternative': {
        'nordic': [ 15, 5, 60 ],
        'deep-dark': [ 30, 30, 30 ],
        'material': [ 40, 40, 40 ], // TODO: Will be calculated by material theme generator
        'light': [ 210, 210, 210 ],
        'bright': [ 230, 230, 230 ]
    },
    shadow: {
        'nordic': [ 10, 0, 60 ],
        'deep-dark': [ 20, 20, 20 ],
        'material': [ 30, 30, 30 ], // TODO: Will be calculated by material theme generator
        'light': [ 230, 230, 230 ],
        'bright': [ 255, 255, 255 ]
    },
    inactive: {
        'nordic': [ 200, 200, 200 ],
        'deep-dark': [ 200, 200, 200 ],
        'material': [ 200, 200, 200 ], // TODO: Will be calculated by material theme generator
        'light': [ 65, 65, 65 ],
        'bright': [ 60, 60, 60 ]
    },
    'inactive-background': {
        'nordic': [ 0, 0, 0 ],
        'deep-dark': [ 0, 0, 0 ],
        'material': [ 255, 255, 255 ], // TODO: Will be calculated by material theme generator
        'light': [ 200, 200, 200 ],
        'bright': [ 60, 60, 60 ]
    }
}

const fonts = {
    'primary': {
        'nordic': 'Comfortaa',
        'deep-dark': 'Comfortaa',
        'material': 'Comfortaa',
        'light': 'Adwaita Sans',
        'bright': 'Adwaita Sans Extralight'
    },
    'accent': {
        'nordic': 'Adwaita Sans',
        'deep-dark': 'Adwaita Sans',
        'material': 'Adwaita Sans',
        'light': 'Cantarell',
        'bright': 'Contarell Thin'
    },
    'mono': {
        'nordic': 'Source Code Pro',
        'deep-dark': 'Source Code Pro',
        'material': 'Source Code Pro',
        'light': 'Jetbrains Mono',
        'bright': 'Jetbrains Mono',
    }
}

const yaziThemes = {
    'nordic': 'tokyo-night',
    'deep-dark': 'vscode-dark-modern',
    'material': 'dracula',
    'light': 'vscode-light-modern',
    'bright': 'vscode-light-modern',
}


/**
 * @param {string} templatePath - absolute path to config directory
 * @param {object} view - rendering config passed to mustache
 * @param {string} originalDir - The original directory, defaults to renderable
 * @param {string} newDir - the output directory override, defaults to config
 */
const render = ( templatePath, view, originalDir = 'renderable', newDir = 'config' ) => {
    // Load template from disk (all can be found in <project-root>/renderable)
    // TODO: Make exclusion better plus copy other files maybe?
    const template = '' + fs.readFileSync( templatePath );
    const outPath = path.join( templatePath.replace( originalDir, newDir ) ); 
    console.log( '=> Rendering to ' + outPath );
    try {
        fs.mkdirSync( path.dirname( outPath ), {
            recursive: true,
        } );
    } catch ( e ) {
        console.error( e );
    }
    fs.writeFileSync( outPath, mustache.render( template, view ) );
}

module.exports = build;