import path from "path";

const PROTOBUF_EXTENSIONS = [
  ".py",
  ".java",
  ".h",
  ".cc",
  ".cpp",
  ".m",
  ".rb",
  ".php",
];
const HAXE_EXTENSIONS = [
  ".js",
  ".py",
  ".lua",
  ".cpp",
  ".h",
  ".java",
  ".cs",
  ".php",
];
const APACHE_THRIFT_EXTENSIONS = [
  ".rb",
  ".py",
  ".go",
  ".js",
  ".m",
  ".java",
  ".h",
  ".cc",
  ".cpp",
  ".php",
];

export default class Generated {
  private name: string;
  private extname: string;
  private lines: string[];
  private _data: Buffer | null;

  constructor(name: string, data: Buffer | null) {
    this.name = name;
    this.extname = path.extname(name);
    this.lines = data === null ? [] : data.toString().split("\n");
    this._data = data;
  }

  isXcodeFile(): boolean {
    return [".nib", ".xcworkspacedata", ".xcuserstate"].includes(this.extname);
  }

  isIntellijFile(): boolean {
    return /(?:^|\/)\.idea\//.test(this.name);
  }

  isCocoapods(): boolean {
    return /(^Pods|\/Pods)\//.test(this.name);
  }

  isCarthageBuild(): boolean {
    return /(^|\/)Carthage\/Build\//.test(this.name);
  }

  isMaybeMinified(): boolean {
    return [".js", ".css"].includes(this.extname.toLowerCase());
  }

  isMinifiedFiles(): boolean {
    if (this.isMaybeMinified() && this.lines.length > 0) {
      let chars = 0;
      this.lines.forEach((line) => {
        chars += line.length;
      });
      return Math.round(chars / this.lines.length) > 110;
    }
    return false;
  }

  hasSourceMap(): boolean {
    if (!this.isMaybeMinified()) {
      return false;
    }
    return this.lines
      .slice(-2)
      .some((line) =>
        /^\/[*/][#@] source(?:Mapping)?URL|sourceURL=/.test(line)
      );
  }

  isSourceMap(): boolean {
    if (this.extname.toLowerCase() !== ".map") {
      return false;
    }

    return (
      /(\.css|\.js)\.map$/i.test(this.name) || // Name convention
      /^{"version":\d+,/.test(this.lines[0]) || // Revision 2 and later begin with the version number
      /^\/\*\* Begin line maps\. \*\*\/{/.test(this.lines[0])
    ); // Revision 1 begins with a magic comment
  }

  isCompiledCoffeescript(): boolean {
    if (this.extname !== ".js") {
      return false;
    }

    // CoffeeScript generated by > 1.2 include a comment on the first line
    if (/^\/\/ Generated by /.test(this.lines[0])) {
      return true;
    }

    if (
      this.lines[0] === "(function() {" &&
      this.lines[this.lines.length - 2] === "}).call(this);" &&
      this.lines[this.lines.length - 1] === ""
    ) {
      let score = 0;
      this.lines.forEach((line) => {
        if (/var /.test(line)) {
          score +=
            1 * (line.match(/(_fn|_i|_len|_ref|_results)/g) || []).length;
          score +=
            3 *
            (
              line.match(/(__bind|__extends|__hasProp|__indexOf|__slice)/g) ||
              []
            ).length;
        }
      });
      return score >= 3;
    }

    return false;
  }

  isGeneratedNetDocfile(): boolean {
    if (this.extname.toLowerCase() !== ".xml") {
      return false;
    }
    if (this.lines.length <= 3) {
      return false;
    }
    return (
      this.lines[1].includes("<doc>") &&
      this.lines[2].includes("<assembly>") &&
      this.lines[this.lines.length - 2].includes("</doc>")
    );
  }

  isGeneratedNetDesignerFile(): boolean {
    return /\.designer\.(cs|vb)$/i.test(this.name);
  }

  isGeneratedNetSpecflowFeatureFile(): boolean {
    return /\.feature\.cs$/i.test(this.name);
  }

  isGeneratedParser(): boolean {
    if (this.extname !== ".js") {
      return false;
    }

    return /^(?:[^/]|\/[^*])*\/\*(?:[^*]|\*[^/])*Generated by PEG.js/.test(
      this.lines.slice(0, 4).join("")
    );
  }

  isGeneratedPostscript(): boolean {
    if (![".ps", ".eps", ".pfa"].includes(this.extname)) {
      return false;
    }

    if (
      this._data &&
      /(\n|\r\n|\r)\s*(?:currentfile eexec\s+|\/sfnts\s+\[\1<)[0-9A-Fa-f]{8,}\1/.test(
        this._data.toString()
      )
    ) {
      return true;
    }

    let creator: string | undefined;
    for (let i = 0; i < 10; i++) {
      const line = this.lines[i];
      if (/^%%Creator: /.test(line)) {
        creator = line.replace(/^%%Creator: /, "");
        break;
      }
    }

    if (!creator) {
      return false;
    }

    if (
      /[0-9]|draw|mpage|ImageMagick|inkscape|MATLAB/.test(creator) ||
      /PCBNEW|pnmtops|\(Unknown\)|Serif Affinity|Filterimage -tops/.test(
        creator
      )
    ) {
      return true;
    }

    if (creator.includes("EAGLE")) {
      for (let i = 0; i < 5; i++) {
        if (this.lines[i].match(/^%%Title: EAGLE Drawing /)) {
          return true;
        }
      }
    }

    return false;
  }

  isNodeModules(): boolean {
    return /node_modules\//.test(this.name);
  }

  isGoVendor(): boolean {
    return /vendor\/((?!-)[-0-9A-Za-z]+(?<!-)\.)+(com|edu|gov|in|me|net|org|fm|io)/.test(
      this.name
    );
  }

  isGoLock(): boolean {
    return /(Gopkg|glide)\.lock/.test(this.name) || /go\.sum/.test(this.name);
  }

  isPoetryLock(): boolean {
    return /poetry\.lock/.test(this.name);
  }

  isUVLock(): boolean {
    return /uv\.lock/.test(this.name);
  }

  isEsyLock(): boolean {
    return /(^|\/)(\w+\.)?esy.lock$/.test(this.name);
  }

  isGeneratedGo(): boolean {
    if (this.extname !== ".go" || this.lines.length <= 1) {
      return false;
    }
    return this.lines
      .slice(0, 40)
      .some((line) => /^\/\/ Code generated .*/.test(line));
  }

  isGeneratedProtocolBufferFromGo(): boolean {
    if (this.extname !== ".proto" || this.lines.length <= 1) {
      return false;
    }
    return this.lines
      .slice(0, 20)
      .some((line) =>
        line.includes("This file was autogenerated by go-to-protobuf")
      );
  }

  isGeneratedProtocolBuffer(): boolean {
    if (!PROTOBUF_EXTENSIONS.includes(this.extname) || this.lines.length <= 1) {
      return false;
    }
    return this.lines
      .slice(0, 3)
      .some((line) =>
        line.includes(
          "Generated by the protocol buffer compiler.  DO NOT EDIT!"
        )
      );
  }

  isGeneratedJavascriptProtocolBuffer(): boolean {
    if (this.extname !== ".js" || this.lines.length <= 6) {
      return false;
    }
    return this.lines[5].includes("GENERATED CODE -- DO NOT EDIT!");
  }

  isNpmShrinkwrapOrPackageLock(): boolean {
    return (
      /npm-shrinkwrap\.json/.test(this.name) ||
      /package-lock\.json/.test(this.name)
    );
  }

  isGeneratedTypescriptProtocolBuffer(): boolean {
    if (this.extname !== ".ts" || this.lines.length <= 4) {
      return false;
    }
    return this.lines[0].includes(
      "Code generated by protoc-gen-ts_proto. DO NOT EDIT."
    );
  }

  isGeneratedApacheThrift(): boolean {
    if (!APACHE_THRIFT_EXTENSIONS.includes(this.extname)) {
      return false;
    }
    return this.lines
      .slice(0, 6)
      .some((line) => line.includes("Autogenerated by Thrift Compiler"));
  }

  isGeneratedJniHeader(): boolean {
    if (this.extname !== ".h" || this.lines.length <= 2) {
      return false;
    }
    return (
      this.lines[0].includes(
        "/* DO NOT EDIT THIS FILE - it is machine generated */"
      ) && this.lines[1].includes("#include <jni.h>")
    );
  }

  isPdmLock(): boolean {
    return /pdm\.lock/.test(this.name);
  }

  isPixiLock(): boolean {
    return /pixi\.lock/.test(this.name);
  }

  isDenoLock(): boolean {
    return /deno\.lock/.test(this.name);
  }

  isPnpmLock(): boolean {
    return /pnpm-lock\.yaml/.test(this.name);
  }

  isGeneratedYarnPlugnplay(): boolean {
    return /(^|\/)\.pnp\..*$/.test(this.name);
  }

  isGodeps(): boolean {
    return /Godeps\//.test(this.name);
  }

  isComposerLock(): boolean {
    return /composer\.lock/.test(this.name);
  }

  isGeneratedByZephir(): boolean {
    return /.\.zep\.(c|h|php)$/.test(this.name);
  }

  isCargoLock(): boolean {
    return /Cargo\.lock/.test(this.name);
  }

  isCargoOrig(): boolean {
    return /Cargo\.toml\.orig/.test(this.name);
  }

  isFlakeLock(): boolean {
    return /(^|\/)flake\.lock$/.test(this.name);
  }

  isBazelLock(): boolean {
    return /(^|\/)MODULE\.bazel\.lock$/.test(this.name);
  }

  isVcrCassette(): boolean {
    if (this.extname !== ".yml" || this.lines.length <= 2) {
      return false;
    }
    return this.lines[this.lines.length - 2].includes("recorded_with: VCR");
  }

  isGeneratedAntlr(): boolean {
    if (this.extname !== ".g" || this.lines.length <= 2) {
      return false;
    }
    return this.lines[1].includes("generated by Xtest");
  }

  isCompiledCythonFile(): boolean {
    if (![".c", ".cpp"].includes(this.extname) || this.lines.length <= 1) {
      return false;
    }
    return this.lines[0].includes("Generated by Cython");
  }

  isPipenvLock(): boolean {
    return /Pipfile\.lock/.test(this.name);
  }

  isTerraformLock(): boolean {
    return /(?:^|\/)\.terraform\.lock\.hcl$/.test(this.name);
  }

  isGeneratedModule(): boolean {
    if (this.extname !== ".mod" || this.lines.length <= 1) {
      return false;
    }
    return (
      this.lines[0].includes("PCBNEW-LibModule-V") ||
      this.lines[0].includes("GFORTRAN module version '")
    );
  }

  isGeneratedUnity3dMeta(): boolean {
    if (this.extname !== ".meta" || this.lines.length <= 1) {
      return false;
    }
    return this.lines[0].includes("fileFormatVersion: ");
  }

  isGeneratedRacc(): boolean {
    if (this.extname !== ".rb" || this.lines.length <= 2) {
      return false;
    }
    return this.lines[2].startsWith(
      "# This file is automatically generated by Racc"
    );
  }

  isGeneratedJflex(): boolean {
    if (this.extname !== ".java" || this.lines.length <= 1) {
      return false;
    }
    return this.lines[0].startsWith(
      "/* The following code was generated by JFlex "
    );
  }

  isGeneratedGrammarkit(): boolean {
    if (this.extname !== ".java" || this.lines.length <= 1) {
      return false;
    }
    return this.lines[0].startsWith(
      "// This is a generated file. Not intended for manual editing."
    );
  }

  isGeneratedRoxygen2(): boolean {
    if (this.extname !== ".Rd" || this.lines.length <= 1) {
      return false;
    }
    return this.lines[0].includes(
      "% Generated by roxygen2: do not edit by hand"
    );
  }

  isGeneratedJison(): boolean {
    if (this.extname !== ".js" || this.lines.length <= 1) {
      return false;
    }
    return (
      this.lines[0].startsWith("/* parser generated by jison ") ||
      this.lines[0].startsWith("/* generated by jison-lex ")
    );
  }

  isGeneratedGrpcCpp(): boolean {
    if (
      ![".cpp", ".hpp", ".h", ".cc"].includes(this.extname) ||
      this.lines.length <= 1
    ) {
      return false;
    }
    return this.lines[0].startsWith("// Generated by the gRPC");
  }

  isGeneratedDart(): boolean {
    if (this.extname !== ".dart" || this.lines.length <= 1) {
      return false;
    }
    return /generated code\W{2,3}do not modify/i.test(this.lines[0]);
  }

  isGeneratedPerlPpportHeader(): boolean {
    if (!this.name.match(/ppport\.h$/) || this.lines.length <= 10) {
      return false;
    }
    return this.lines[8].includes("Automatically created by Devel::PPPort");
  }

  isGeneratedGraphqlRelay(): boolean {
    return /__generated__\//.test(this.name);
  }

  isGeneratedGamemakerStudio(): boolean {
    if (![".yy", ".yyp"].includes(this.extname) || this.lines.length <= 3) {
      return false;
    }
    return (
      /^\s*[{[]/.test(this.lines.slice(0, 3).join("")) ||
      /^\d\.\d\.\d.+\|\{/.test(this.lines[0])
    );
  }

  isGeneratedGimp(): boolean {
    if (![".c", ".h"].includes(this.extname) || this.lines.length === 0) {
      return false;
    }
    return (
      /^\/\* GIMP [a-zA-Z0-9\- ]+ C-Source image dump \(.+?\.c\) \*\//.test(
        this.lines[0]
      ) ||
      /^\/\* {2}GIMP header image file format \([a-zA-Z0-9\- ]+\): .+?\.h {2}\*\//.test(
        this.lines[0]
      )
    );
  }

  isGeneratedVisualstudio6(): boolean {
    if (this.extname.toLowerCase() !== ".dsp") {
      return false;
    }
    return this.lines
      .slice(0, 3)
      .some((line) =>
        line.includes("# Microsoft Developer Studio Generated Build File")
      );
  }

  isGeneratedHaxe(): boolean {
    if (!HAXE_EXTENSIONS.includes(this.extname)) {
      return false;
    }
    return this.lines
      .slice(0, 3)
      .some((line) => line.includes("Generated by Haxe"));
  }

  private extractHtmlMeta(metaTag: string): { [key: string]: string } {
    const attrs: { [key: string]: string } = {};
    const matches = metaTag.matchAll(
      /(\w+[-\w]*)\s*=\s*(?:["']([^"']*)["']|(\S+))/g
    );
    for (const match of matches) {
      const value = match[2] || match[3];
      attrs[match[1].toLowerCase()] = value.trim();
    }
    return attrs;
  }

  isGeneratedHtml(): boolean {
    if (
      ![".html", ".htm", ".xhtml"].includes(this.extname.toLowerCase()) ||
      this.lines.length <= 1
    ) {
      return false;
    }

    // Pkgdown
    if (
      this.lines
        .slice(0, 2)
        .some((line) =>
          line.includes("<!-- Generated by pkgdown: do not edit by hand -->")
        )
    ) {
      return true;
    }

    // Mandoc
    if (
      this.lines.length > 2 &&
      this.lines[2].startsWith("<!-- This is an automatically generated file.")
    ) {
      return true;
    }

    // Doxygen
    if (
      this.lines
        .slice(0, 31)
        .some((line) =>
          /<!--\s+Generated by Doxygen\s+[.0-9]+\s*-->/i.test(line)
        )
    ) {
      return true;
    }

    // HTML meta generator tag
    const htmlContent = this.lines.slice(0, 31).join(" ");
    const metaTags = htmlContent.match(/<meta(\s+[^>]+)>/gi);
    if (!metaTags) return false;

    return metaTags.some((tag) => {
      const attrs = this.extractHtmlMeta(tag);
      if (attrs["name"]?.toLowerCase() !== "generator") return false;

      return [attrs["content"], attrs["value"]].some(
        (cv) =>
          cv &&
          /^(org\s+mode|j?latex2html|groff|makeinfo|texi2html|ronn)\b/i.test(cv)
      );
    });
  }

  isGeneratedJooq(): boolean {
    if (this.extname.toLowerCase() !== ".java") {
      return false;
    }
    return this.lines
      .slice(0, 2)
      .some((line) => line.includes("This file is generated by jOOQ."));
  }

  isGeneratedPascalTlb(): boolean {
    return /_tlb\.pas$/i.test(this.name);
  }

  isHtmlcov(): boolean {
    return /(?:^|\/)htmlcov\//.test(this.name);
  }

  isGeneratedSqlxQuery(): boolean {
    return /(?:^|.*\/)\.sqlx\/query-.+\.json$/.test(this.name);
  }

  /**
   * Checks if a file is generated by examining various characteristics.
   * This includes checking for:
   * - Build artifacts (Xcode, IntelliJ, etc.)
   * - Package manager files (npm, yarn, cargo, etc.)
   * - Minified/compiled files (JavaScript, CoffeeScript, etc.)
   * - Generated code (Protocol Buffers, Thrift, etc.)
   * - Documentation (HTML, Doxygen, etc.)
   * - Source maps and debug files
   * - Various framework-specific generated files
   *
   * @returns {boolean} Returns true if the file is determined to be generated, false otherwise
   */
  isGenerated(): boolean {
    return (
      this.isXcodeFile() ||
      this.isIntellijFile() ||
      this.isCocoapods() ||
      this.isCarthageBuild() ||
      this.isMinifiedFiles() ||
      this.hasSourceMap() ||
      this.isSourceMap() ||
      this.isCompiledCoffeescript() ||
      this.isGeneratedNetDocfile() ||
      this.isGeneratedNetDesignerFile() ||
      this.isGeneratedNetSpecflowFeatureFile() ||
      this.isGeneratedParser() ||
      this.isGeneratedPostscript() ||
      this.isNodeModules() ||
      this.isGoVendor() ||
      this.isGoLock() ||
      this.isPoetryLock() ||
      this.isUVLock() ||
      this.isEsyLock() ||
      this.isGeneratedGo() ||
      this.isGeneratedProtocolBufferFromGo() ||
      this.isGeneratedProtocolBuffer() ||
      this.isGeneratedJavascriptProtocolBuffer() ||
      this.isNpmShrinkwrapOrPackageLock() ||
      this.isGeneratedTypescriptProtocolBuffer() ||
      this.isGeneratedApacheThrift() ||
      this.isGeneratedJniHeader() ||
      this.isPdmLock() ||
      this.isPixiLock() ||
      this.isDenoLock() ||
      this.isPnpmLock() ||
      this.isGeneratedYarnPlugnplay() ||
      this.isGodeps() ||
      this.isComposerLock() ||
      this.isGeneratedByZephir() ||
      this.isCargoLock() ||
      this.isCargoOrig() ||
      this.isFlakeLock() ||
      this.isBazelLock() ||
      this.isVcrCassette() ||
      this.isGeneratedAntlr() ||
      this.isCompiledCythonFile() ||
      this.isPipenvLock() ||
      this.isTerraformLock() ||
      this.isGeneratedModule() ||
      this.isGeneratedUnity3dMeta() ||
      this.isGeneratedRacc() ||
      this.isGeneratedJflex() ||
      this.isGeneratedGrammarkit() ||
      this.isGeneratedRoxygen2() ||
      this.isGeneratedJison() ||
      this.isGeneratedGrpcCpp() ||
      this.isGeneratedDart() ||
      this.isGeneratedPerlPpportHeader() ||
      this.isGeneratedGraphqlRelay() ||
      this.isGeneratedGamemakerStudio() ||
      this.isGeneratedGimp() ||
      this.isGeneratedVisualstudio6() ||
      this.isGeneratedHaxe() ||
      this.isGeneratedHtml() ||
      this.isGeneratedJooq() ||
      this.isGeneratedPascalTlb() ||
      this.isHtmlcov() ||
      this.isGeneratedSqlxQuery()
    );
  }
}