import gulp from "gulp";
import sass from "gulp-dart-sass";
import rename from "gulp-rename";
import rewrite from "gulp-rewrite-css";
import concat from "gulp-concat";
import lazypipe from "lazypipe";
import gulpif from "gulp-if";
import terser from "gulp-terser";
import sourcemaps from "gulp-sourcemaps";
import path, * as pathDir from "path";
import fs from "fs";
import rtlcss from "gulp-rtlcss";
import cleancss from "gulp-clean-css";
import yargs from "yargs";
import {hideBin} from 'yargs/helpers'
import {glob} from "glob";
import {fileURLToPath} from 'url';
import {build} from "./build.js";

const argv = yargs(hideBin(process.argv)).argv;

// merge with default parameters
const args = Object.assign(
  {
    prod: false,
    sass: false,
    js: false,
    media: false,
  },
  argv
);

let allAssets = false;
if (args.sass === false && args.js === false && args.media === false) {
  allAssets = true;
}

// default variable config
const config = Object.assign(
  {},
  {
    demo: "",
    debug: true,
    compile: {
      jsMinify: false,
      cssMinify: false,
      jsSourcemaps: false,
      cssSourcemaps: false,
    },
  },
  build.config
);

/**
 * Walk into object recursively
 * @param array
 * @param funcname
 * @param userdata
 * @returns {boolean}
 */
function objectWalkRecursive(array, funcname, userdata) {
  if (!array || typeof array !== 'object') {
    return false;
  }
  if (typeof funcname !== 'function') {
    return false;
  }

  for (let key in array) {
    // apply "funcname" recursively only on object
    if (Object.prototype.toString.call(array[key]) === '[object Object]') {
      const funcArgs = [array[key], funcname];
      if (arguments.length > 2) {
        funcArgs.push(userdata);
      }
      if (objectWalkRecursive.apply(null, funcArgs) === false) {
        return false;
      }
      // continue
    }
    try {
      if (arguments.length > 2) {
        funcname(array[key], key, userdata);
      }
      else {
        funcname(array[key], key);
      }
    }
    catch (e) {
      console.error('e', e);
      return false;
    }
  }
  return true;
};

/**
 * Add JS compilation options to gulp pipe
 */
const jsChannel = () => {
  const { compile } = config;
  const { jsSourcemaps, jsMinify } = compile;
  return lazypipe()
    .pipe(() => {
      return gulpif(
        jsSourcemaps,
        sourcemaps.init({ loadMaps: true, debug: config.debug }),
        sourcemaps.init({ loadMaps: true, debug: config.debug }),
      );
    })
    .pipe(() => {
      return gulpif(jsMinify, terser());
    })
    .pipe(() => {
      return gulpif(
        jsSourcemaps,
        sourcemaps.write("./"),
        sourcemaps.write(null, {addComment: false})
        );
    });
};

/**
 * Add CSS compilation options to gulp pipe
 */
const cssChannel = (rtl, includePaths) => {
  const { compile } = config;
  const { cssSourcemaps, cssMinify } = compile;
  return lazypipe()
    .pipe(() => {
      return gulpif(
        cssSourcemaps,
        sourcemaps.init({ loadMaps: true, debug: config.debug })
      );
    })
    .pipe(() => {
      return sass({
        errLogToConsole: true,
        includePaths: [build.config.path.src + "/sass", "node_modules"].concat(
          includePaths
        ),
        // outputStyle: config.cssMinify ? 'compressed' : '',
      }).on("error", sass.logError);
    })
    .pipe(() => {
      // convert rtl for style.bundle.css only here, others already converted before
      return gulpif(rtl, rtlcss());
    })
    .pipe(() => {
      return gulpif(cssMinify, cleancss());
    })
    .pipe(() => {
      return gulpif(cssSourcemaps, sourcemaps.write("./"));
    });
};

/**
 * Multiple output paths by output config
 * @param path
 * @param outputFile
 * @param type
 * @returns {*}
 */
const outputChannel = (path, outputFile, type) => {
  if (!allAssets) {
    if (args.sass && ["styles"].indexOf(type) === -1) {
      return lazypipe().pipe(() => {
        // noop
      });
    }
    if (args.js && ["scripts"].indexOf(type) === -1) {
      return lazypipe().pipe(() => {
        // noop
      });
    }
    if (args.media && ["media", "fonts", "images"].indexOf(type) === -1) {
      return lazypipe().pipe(() => {
        // noop
      });
    }
  }

  if (typeof path === "undefined") {
    console.log("Output path not defined");
  }
  if (typeof outputFile === "undefined") {
    outputFile = "";
  }

  let piping = lazypipe();

  if (type === "styles") {
    piping = piping.pipe(() => {
      return gulpif(
        build.config.compile.cssMinify,
        rename({ suffix: args.suffix ? ".min" : "" })
      );
    });
  }

  if (type === "scripts") {
    piping = piping.pipe(() => {
      return gulpif(
        build.config.compile.jsMinify,
        rename({ suffix: args.suffix ? ".min" : "" })
      );
    });
  }

  const regex = new RegExp(/\{\$.*?\}/);
  const matched = path.match(regex);
  // {$config.dist}/plugins/global/fonts/fonticon
  if (matched) {
    const outputs = build.config.dist;
    outputs.forEach((output) => {
      let outputPath = path.replace(matched[0], output).replace(outputFile, "");
      (function (_output) {
        piping = piping.pipe(() => {
          return gulp.dest(_output);
        });
      })(outputPath);
    });
  }

  if (typeof cb !== 'undefined') {
    cb();
  }

  return piping;
};

/**
 * Convert string path to actual path
 * @param path
 * @returns {*}
 */
const dotPath = (path) => {
  const regex = new RegExp(/\{\$(.*?)\}/),
    dot = (obj, i) => {
      return obj[i];
    };
  const matched = path.match(regex);
  if (matched) {
    const realpath = matched[1].split(".").reduce(dot, build);
    return path.replace(matched[0], realpath);
  }

  return path;
};

/**
 * Convert multiple paths
 * @param paths
 */
const dotPaths = (paths) => {
  paths.forEach((path, i) => {
    paths[i] = dotPath(path);
  });
};

/**
 * Css path rewriter when bundle files moved
 * @param bundle
 */
const cssRewriter = (bundle) => {
  const imgRegex = new RegExp(/\.(gif|jpg|jpeg|tiff|png|ico|svg)$/i);

  return lazypipe().pipe(() => {
    // rewrite css relative path
    return rewrite({
      destination: bundle["styles"],
      debug: config.debug,
      adaptPath: (ctx) => {
        const isCss = ctx.sourceFile.match(/\.[css]+$/i);
        // process css only
        if (isCss[0] === ".css") {
          if (/plugins.*?bundle/.test(bundle["styles"])) {
            const pieces = ctx.sourceDir.split(/\\|\//);
            // only vendors/base pass this
            let vendor = pieces[pieces.indexOf("node_modules") + 1];
            if (pieces.indexOf("node_modules") === -1) {
              vendor = pieces[pieces.indexOf("plugins") + 1];
            }

            let extension = "fonts/";
            if (imgRegex.test(ctx.targetFile)) {
              extension = "images/";
            }

            return path.join(extension, vendor, path.basename(ctx.targetFile));
          }

          return ctx.targetFile.replace(/\.?\.\//, "");
        }
      },
    });
  });
};

/**
 * Get end filename from path
 * @param path
 * @returns {string}
 */
const baseFileName = (path) => {
  const maybeFile = path.split("/").pop();
  if (maybeFile.indexOf(".") !== -1) {
    return maybeFile;
  }
  return "";
};

const baseName = (str, extension) => {
  let base = new String(str).substring(str.lastIndexOf("/") + 1);
  if (!extension && base.lastIndexOf(".") != -1) {
    base = base.substring(0, base.lastIndexOf("."));
  }
  return base;
};

/**
 * Remove file name and get the path
 */
const pathOnly = (str) => {
  const array = str.split("/");
  if (array.length > 0) {
    array.pop();
  }

  return array.join("/");
};

const getDemos = () => {
  if (build.build.demos) {
    return [];
  }

  let demos = Object.keys(build.build.demos);
  // build by demo, leave demo empty to generate all demos
  if (typeof build.config.demo !== "undefined" && build.config.demo !== "") {
    demos = build.config.demo.split(",").map((item) => {
      return item.trim();
    });
  }
  return demos;
};

const getFolders = (dir) => {
  try {
    return fs.readdirSync(dir).filter((file) => {
      return fs.statSync(path.join(dir, file)).isDirectory();
    });
  }catch(e) {
    return [];
  }
};

const getParameters = () => {
  // remove first 2 unused elements from array
  let argv = JSON.parse(process.env.npm_config_argv).cooked.slice(2);
  argv = argv.map((arg) => {
    return arg.replace(/--/i, "");
  });
  return argv;
};

const getDemo = () => {
  // get demo from parameters
  let demo = Object.keys(argv)
      .join(" ")
      .match(/(demo\d+)/gi) || "";

  if (typeof demo === "object") {
    demo = demo[0];
  }

  return demo;
};

const getTheme = () => {
  // get demo from parameters
  const theme = Object.keys(argv)[1];
  const folders = getFolders(build.config.path.src.split("{theme}")[0]);
  if (folders.indexOf(theme) !== -1) {
    return theme;
  }
  // default theme
  return "";
};

const bundleStreams = [];

/**
 * Bundle
 * @param bundle
 */
const bundle = (bundle) => {
  let stream;

  if (bundle.hasOwnProperty("src") && bundle.hasOwnProperty("dist")) {
    // for images & fonts as per vendor
    if ("mandatory" in bundle.src && "optional" in bundle.src) {
      let vendors = {};

      for (let key in bundle.src) {
        if (!bundle.src.hasOwnProperty(key)) {
          continue;
        }
        if (key === "override") {
          continue;
        }
        vendors = Object.assign(vendors, bundle.src[key]);
      }

      for (let vendor in vendors) {
        if (!vendors.hasOwnProperty(vendor)) {
          continue;
        }

        const vendorObj = vendors[vendor];

        for (let type in vendorObj) {
          if (!vendorObj.hasOwnProperty(type)) {
            continue;
          }

          dotPaths(vendorObj[type]);

          switch (type) {
            case "fonts":
              stream = gulp.src(vendorObj[type], { allowEmpty: true });
              const outputFonts = outputChannel(bundle.dist[type] + "/" + vendor, undefined, type)();
              if (outputFonts) {
                stream.pipe(outputFonts);
              }
              bundleStreams.push(stream);
              break;
            case "images":
              stream = gulp.src(vendorObj[type], { allowEmpty: true });
              const outputImages = outputChannel(bundle.dist[type] + "/" + vendor, undefined, type)();
              if (outputImages) {
                stream.pipe(outputImages);
              }
              bundleStreams.push(stream);
              break;
          }
        }
      }
    }

    // flattening array
    if (!("styles" in bundle.src) && !("scripts" in bundle.src)) {
      const src = { styles: [], scripts: [] };
      objectWalkRecursive(bundle.src, (paths, type) => {
        switch (type) {
          case "styles":
          case "scripts":
            src[type] = src[type].concat(paths);
            break;
          case "images":
            // images for mandatory and optional vendor already processed
            if (!"mandatory" in bundle.src || !"optional" in bundle.src) {
              src[type] = src[type].concat(paths);
            }
            break;
        }
      });
      bundle.src = src;
    }

    for (let type in bundle.src) {
      if (!bundle.src.hasOwnProperty(type)) {
        continue;
      }
      // skip if not array
      if (
        Object.prototype.toString.call(bundle.src[type]) !== "[object Array]"
      ) {
        continue;
      }
      // skip if no bundle output is provided
      if (typeof bundle.dist[type] === "undefined") {
        continue;
      }

      dotPaths(bundle.src[type]);
      const outputFile = baseFileName(bundle.dist[type]);

      switch (type) {
        case "styles":
          if (bundle.dist.hasOwnProperty(type)) {

            // rtl css bundle
            if (
              typeof build.config.compile.rtl !== "undefined" &&
              build.config.compile.rtl.enabled
            ) {
              let toRtlFiles = [];
              let rtlFiles = [];
              bundle.src[type].forEach((path) => {
                // get rtl css file path
                let cssFile =
                  pathOnly(path) + "/" + baseName(path) + ".rtl.css";
                // check if rtl file is exist
                if (
                  fs.existsSync(cssFile) &&
                  build.config.compile.rtl.skip.indexOf(baseName(path)) === -1
                ) {
                  rtlFiles = rtlFiles.concat(cssFile);
                } else {
                  // rtl css file not exist, use default css file
                  cssFile = path;
                }
                toRtlFiles = toRtlFiles.concat(cssFile);
              });

              let shouldRtl = false;
              if (baseName(bundle.dist[type]) === "style.bundle") {
                shouldRtl = true;
              }

              const rtlOutput = pathOnly(bundle.dist[type]) + "/" + baseName(bundle.dist[type]) + ".rtl.css";
              stream = gulp
                .src(toRtlFiles, { allowEmpty: true })
                .pipe(cssRewriter(bundle.dist)())
                .pipe(concat(baseName(bundle.dist[type]) + ".rtl.css"))
                .pipe(cssChannel(shouldRtl)());
              const outputRTLCSS = outputChannel(rtlOutput, baseName(bundle.dist[type]) + ".rtl.css", type)();
              if (outputRTLCSS) {
                stream.pipe(outputRTLCSS);
              }
              bundleStreams.push(stream);
            }

            // default css bundle
            stream = gulp
              .src(bundle.src[type], { allowEmpty: true })
              .pipe(cssRewriter(bundle.dist)())
              .pipe(concat(outputFile))
              .pipe(cssChannel()());
            const outputDefaultCSSBundle = outputChannel(bundle.dist[type], outputFile, type)();
            if (outputDefaultCSSBundle) {
              stream.pipe(outputDefaultCSSBundle);
            }
            bundleStreams.push(stream);
          }
          break;

        case "scripts":
          if (bundle.dist.hasOwnProperty(type)) {
            stream = gulp
              .src(bundle.src[type], { allowEmpty: true })
              .pipe(concat(outputFile))
              .pipe(jsChannel()())
              .on("error", console.error.bind(console));
            const outputScripts = outputChannel(bundle.dist[type], outputFile, type)();
            if (outputScripts) {
              stream.pipe(outputScripts);
            }
            bundleStreams.push(stream);
          }

          break;

        case "media":
        case "fonts":
        case "images":
          if (bundle.dist.hasOwnProperty(type)) {
            stream = gulp.src(bundle.src[type], { allowEmpty: true });
            const outputImages = outputChannel(bundle.dist[type], undefined, type)();
            if (outputImages) {
              stream.pipe(outputImages);
            }
            bundleStreams.push(stream);
          }
          break;
      }
    }
  }

  return bundleStreams;
};

const outputFuncStreams = [];

/**
 * Copy source to output destination
 * @param bundle
 */
const outputFunc = (bundle) => {
  let stream;

  if (bundle.hasOwnProperty("src") && bundle.hasOwnProperty("dist")) {
    for (let type in bundle.src) {
      if (!bundle.src.hasOwnProperty(type)) {
        continue;
      }

      dotPaths(bundle.src[type]);

      if (bundle.dist.hasOwnProperty(type)) {
        switch (type) {
          case "styles":
            // non rtl styles
            stream = gulp
              .src(bundle.src[type], { allowEmpty: true })
              .pipe(cssChannel()());
            const outputStyles = outputChannel(bundle.dist[type], undefined, type)();
            if (outputStyles) {
              stream.pipe(outputStyles);
            }
            outputFuncStreams.push(stream);

            // rtl styles for scss
            let shouldRtl = false;
            if (
              typeof build.config.compile.rtl !== "undefined" &&
              build.config.compile.rtl.enabled
            ) {
              bundle.src[type].forEach((output) => {
                if (output.indexOf(".scss") !== -1) {
                  shouldRtl = true;
                }
              });
              stream = gulp
                .src(bundle.src[type], { allowEmpty: true })
                .pipe(cssChannel(shouldRtl)())
                .pipe(rename({ suffix: ".rtl" }));
              const rtlOutput = outputChannel(bundle.dist[type], undefined, type)();
              if (rtlOutput) {
                stream.pipe(rtlOutput);
              }
              outputFuncStreams.push(stream);
            }
            break;
          case "scripts":
            /**
             * START: bundle by folder
             */
            bundle.src[type].forEach((file) => {
              const needBundleFileWildLocation = file.replace(
                "*.js",
                "bundle/*.js"
              );

              const __filename = fileURLToPath(import.meta.url);
              const __dirname = pathDir.dirname(__filename);
              const needBundleFiles = glob.sync(
                path.resolve(__dirname, "../" + needBundleFileWildLocation)
              );
              if (needBundleFiles.length > 0) {
                const needBundleByGroup = [];
                needBundleFiles.forEach((js) => {
                  const p = path.dirname(js);
                  if (typeof needBundleByGroup[p] === "undefined") {
                    needBundleByGroup[p] = [];
                  }
                  needBundleByGroup[p].push(js);
                });

                for (let g in needBundleByGroup) {
                  if (!needBundleByGroup.hasOwnProperty(g)) {
                    continue;
                  }

                  const files = needBundleByGroup[g];

                  // remove ${config.dist}
                  const separatorDir = bundle.dist[type].replace(
                    /{\$config\.dist}/,
                    ""
                  );
                  // get sub dir
                  const needBundleDir = files[0].split(separatorDir)[1];
                  const needBundleOutputPath = needBundleDir.replace(
                    /^(.*?)\/(bundle)\/.*?\.(js)$/,
                    "$1.$2.$3"
                  );

                  const needBundleStream = gulp
                    .src(files)
                    .pipe(concat(needBundleOutputPath))
                    .pipe(jsChannel()())
                    .on("error", console.error.bind(console));
                  const needBundleOutput = outputChannel(bundle.dist[type], undefined, type)();
                  if (needBundleOutput) {
                    needBundleStream.pipe(needBundleOutput);
                  }
                  outputFuncStreams.push(needBundleStream);

                  // exclude bundle folder from next gulp process
                  bundle.src[type].push(
                    "!" +
                      path
                        .dirname(needBundleFileWildLocation)
                        .replace(/\*+?\/bundle/, "") +
                      needBundleDir.replace(/\/bundle.*?$/, "/**")
                  );
                }
              }
            });
            /**
             * END: bundle by folder
             */

            stream = gulp
              .src(bundle.src[type], { allowEmpty: true })
              .pipe(jsChannel()())
              .on("error", console.error.bind(console));
            const output2 = outputChannel(bundle.dist[type], undefined, type)();
            if (output2) {
              stream.pipe(output2);
            }
            outputFuncStreams.push(stream);
            break;
          default:
            stream = gulp.src(bundle.src[type], { allowEmpty: true });
            const outputDefault = outputChannel(bundle.dist[type], undefined, type)();
            if (outputDefault) {
              stream.pipe(outputDefault);
            }
            outputFuncStreams.push(stream);
            break;
        }
      }
    }
  }

  return outputFuncStreams;
};

// Exports
export {
  argv,
  getDemo,
  getTheme,
  objectWalkRecursive,
  dotPath,
  pathOnly,
  outputFunc,
  bundle,
  getFolders,
};
