#! /usr/bin/env node

import fs from "fs";
import { exec } from "child_process";
import { LessCssWatcherConfigObject } from "./index.d";

if (fs.existsSync("./lesscw.config.json")) {
    if (process.argv.indexOf("--src") >= 0 || process.argv.indexOf("--dst") >= 0) {
        try {
            process.argv.splice(process.argv.indexOf("--src"));
            process.argv.splice(process.argv.indexOf("--dst"));
        } catch (error) {}
    }

    try {
        const configObject: LessCssWatcherConfigObject = JSON.parse(fs.readFileSync("./lesscw.config.json", "utf-8"));

        if (configObject?.src && configObject?.dst && typeof configObject.src === "string" && typeof configObject.dst === "string") {
            process.argv.push("--src", configObject.src);
            process.argv.push("--dst", configObject.dst);
        } else if (configObject?.src && configObject?.dst && typeof configObject.src === "object" && typeof configObject.dst === "object" && Array.isArray(configObject.src) && Array.isArray(configObject.dst)) {
            process.argv.push("--src", configObject.src.join(","));
            process.argv.push("--dst", configObject.dst.join(","));
        } else if (configObject?.srcDst && Array.isArray(configObject.srcDst) && configObject.srcDst.length > 0) {
            const srcDstArray = configObject.srcDst;

            let srcArray: string[] = [];
            let dstArray: string[] = [];

            srcDstArray.forEach((item) => {
                if (item?.src && item?.dst && typeof item.src === "string" && typeof item.dst === "string") {
                    srcArray.push(item.src);
                    dstArray.push(item.dst);
                }
            });

            if (srcArray.length && dstArray.length) {
                process.argv.push("--src", srcArray.join(","));
                process.argv.push("--dst", dstArray.join(","));
            }
        }
    } catch (error: any) {
        console.log("ERROR in your config file =>", error.message);
        process.exit();
    }
}

const sourceFile = process.argv.indexOf("--src") >= 0 ? process.argv[process.argv.indexOf("--src") + 1] : null;
const destinationFile = process.argv.indexOf("--dst") >= 0 ? process.argv[process.argv.indexOf("--dst") + 1] : null;

/** ****************************************************************************** */
/** ****************************************************************************** */
/** ****************************************************************************** */
/** ****************************************************************************** */
/** ****************************************************************************** */
/** ****************************************************************************** */

console.log("\x1b[44mRunning Less compiler\x1b[0m ...");

if (!sourceFile || !destinationFile) {
    console.log("\x1b[33mERROR:\x1b[0m => Missing source or destination file");
    process.exit();
}

const sourceFiles = sourceFile.split(",");
const dstFiles = destinationFile.split(",");

/**
 * Loop through source files and destination files and run the compile function
 */
for (let i = 0; i < sourceFiles.length; i++) {
    const srcFolder = sourceFiles[i];
    const dstFile = dstFiles[i];

    if (srcFolder?.match(/\.[^\/]+$/) && !srcFolder?.match(/\.less$/)) {
        console.log("\x1b[33mERROR:\x1b[0m Source must be a folder or a .less file");
        process.exit();
    }

    compile(srcFolder, dstFile, null);

    if (!fs.existsSync(srcFolder)) {
        if (srcFolder?.match(/\.less$/)) {
            fs.mkdirSync(srcFolder.replace(/\/[^\/]+\.less$/, ""), { recursive: true });
            fs.writeFileSync(srcFolder, "", "utf-8");
        } else {
            fs.mkdirSync(srcFolder.replace(/\/[^\/]+\.[^\/]+$/, ""), { recursive: true });
        }
    }

    if (!fs.existsSync(dstFile)) {
        if (dstFile?.match(/\.css$/)) {
            fs.mkdirSync(dstFile.replace(/\/[^\/]+\.css$/, ""), { recursive: true });
            fs.writeFileSync(dstFile, "", "utf-8");
        } else {
            fs.mkdirSync(dstFile.replace(/\/[^\/]+\.[^\/]+$/, ""), { recursive: true });
            fs.writeFileSync((dstFile + "/_main.css").replace(/\/\//g, ""), "", "utf-8");
        }
    }

    fs.watch(srcFolder, { recursive: true }, (evtType, fileName) => {
        if (!fileName) return;

        const filePathRoot = srcFolder?.match(/\.less$/) ? srcFolder : srcFolder + "/" + fileName;

        compile(filePathRoot, dstFile, evtType);
    });
}

/**
 * Compile less file to css function
 * @param fileName - less file path or folder path
 * @param dst - destination file path or folder path
 * @param evtType - event type (change, rename, etc.) or null
 * @returns
 */
function compile(fileName: string, dst: string, evtType: string | null) {
    if (fileName?.match(/\(/) || (fileName.match(/\..{2,4}$/) && !fileName?.match(/\.less$/i))) {
        return;
    }

    let finalSrcPath = fileName?.match(/\.less$/) ? fileName : `${fileName}/main.less`;
    let finalDstPath = dst;

    if (fileName?.match(/\[/)) {
        const paths = fileName.split("/");
        const targetPathFull = paths[paths.length - 1];
        const targetPath = targetPathFull.replace(/\[|\]/g, "").replace(/\.less/, "");

        const destinationFileParentFolder = dst.replace(/\/[^\/]+\.css$/, "");

        const targetDstFilePath = `${destinationFileParentFolder}/${targetPath}.css`;

        finalSrcPath = `${fileName}/${targetPathFull}`;
        finalDstPath = targetDstFilePath;
    }

    exec(`lessc ${finalSrcPath} ${finalDstPath?.match(/\.css$/) ? finalDstPath : finalDstPath.replace(/\/$/, "") + "/_main.css"}`, (error, stdout, stderr) => {
        /** @type {Error} */
        if (error) {
            console.log("ERROR =>", error.message);

            if (!evtType?.match(/change/i) && fileName && fileName.match(/\[/)) {
                fs.unlinkSync(finalDstPath);
            }

            return;
        }

        console.log("Less Compilation \x1b[32msuccessful\x1b[0m!");
    });
}