import crypto from "node:crypto";
import fs from "node:fs";
import path from "node:path";
import { execFileSync } from "node:child_process";
import { fileURLToPath } from "node:url";

const toolsRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)));
const projectRoot = path.resolve(toolsRoot, "..");
const workspaceRoot = path.resolve(projectRoot, "..");
const distRoot = path.join(projectRoot, "web", "dist");
const evidencePath = path.join(projectRoot, "docs", "web-license-evidence.json");
const outputPath = path.join(projectRoot, "docs", "web-license-artifact-map.json");

const evidence = JSON.parse(fs.readFileSync(evidencePath, "utf8"));
const sourceRevision = execFileSync("git", ["-C", path.join(projectRoot, "freecad-source"), "rev-parse", "HEAD"], {
  encoding: "utf8",
}).trim();

const dependencyRows = [...evidence.sourceDependencies, ...evidence.webDependencies];
const dependencyByProject = new Map(dependencyRows.map((row) => [row.project, row]));
const artifactRules = [
  {
    match: (relative) => relative === "index.html",
    sources: ["FreeCAD/web/index.html"],
    dependencies: ["FreeCAD Web UI"],
    unresolved: [],
  },
  {
    match: (relative) => /^assets\/index-[^/]+\.js$/.test(relative),
    sources: [
      "FreeCAD/web/src/main.ts",
      "FreeCAD/web/src/storage.ts",
      "FreeCAD/web/src/mesh-cache.ts",
      "FreeCAD/web/src/recovery.ts",
      "FreeCAD/web/src/worker-protocol.ts",
    ],
    dependencies: ["FreeCAD Web UI", "three", "lucide"],
    unresolved: [],
  },
  {
    match: (relative) => /^assets\/kernel\.worker-[^/]+\.js$/.test(relative),
    sources: ["FreeCAD/web/src/kernel.worker.ts", "FreeCAD/web/src/worker-protocol.ts"],
    dependencies: ["FreeCAD Web UI"],
    unresolved: [],
  },
  {
    match: (relative) => /^kernel\/FreeCADWebKernel\.(js|wasm)$/.test(relative),
    sources: [
      "FreeCAD/freecad-source/src/WebAssembly/FreeCADWebBridge.cpp",
      "FreeCAD/freecad-source/src/WebAssembly/CMakeLists.txt",
    ],
    dependencies: ["FreeCAD Web UI", "Open CASCADE"],
    unresolved: [
      {
        name: "Emscripten",
        version: "3.1.6",
        reason: "build tool generated JavaScript/WASM glue; no runtime package is shipped",
        evidence: ["FreeCAD/docs/freecad-web-bridge-build.log", "FreeCAD/freecad-source/build-web/bridge/build.ninja"],
      },
    ],
  },
  {
    match: (relative) => relative === "samples/freecad-sample.step",
    sources: ["FreeCAD/freecad-source/data/tests/Step/as1-ac-214_small.stp"],
    dependencies: ["FreeCAD Web UI"],
    unresolved: [],
  },
];

function sha256(filePath) {
  return crypto.createHash("sha256").update(fs.readFileSync(filePath)).digest("hex");
}

function filesUnder(root) {
  const files = [];
  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
    const entryPath = path.join(root, entry.name);
    if (entry.isDirectory()) files.push(...filesUnder(entryPath));
    else if (entry.isFile()) files.push(entryPath);
  }
  return files.sort();
}

function dependencyRecord(project) {
  const row = dependencyByProject.get(project);
  if (!row) throw new Error(`missing license evidence for dependency: ${project}`);
  return {
    id: `${project}@${row.version}`,
    project: row.project,
    version: row.version,
    licenseLabel: row.licenseLabel,
    evidence: row.evidence,
    sha256: row.sha256,
    status: row.status,
  };
}

if (!fs.existsSync(distRoot)) throw new Error(`artifact directory does not exist: ${distRoot}`);

const artifacts = filesUnder(distRoot).map((absolutePath) => {
  const relative = path.relative(distRoot, absolutePath).split(path.sep).join("/");
  const rule = artifactRules.find((candidate) => candidate.match(relative));
  if (!rule) throw new Error(`unmapped release artifact: ${relative}`);
  for (const source of rule.sources) {
    if (!fs.existsSync(path.join(workspaceRoot, source))) throw new Error(`missing source for ${relative}: ${source}`);
  }
  for (const unresolved of rule.unresolved) {
    for (const item of unresolved.evidence) {
      if (!fs.existsSync(path.join(workspaceRoot, item))) throw new Error(`missing unresolved evidence for ${relative}: ${item}`);
    }
  }
  return {
    path: `FreeCAD/web/dist/${relative}`,
    size: fs.statSync(absolutePath).size,
    sha256: sha256(absolutePath),
    sources: rule.sources,
    dependencyRefs: rule.dependencies.map(dependencyRecord),
    unresolvedDependencies: rule.unresolved,
    buildEvidence: relative.startsWith("kernel/")
      ? ["FreeCAD/docs/freecad-web-bridge-build.log", "FreeCAD/freecad-source/build-web/bridge/build.ninja"]
      : ["FreeCAD/web/package.json", "FreeCAD/web/package-lock.json"],
  };
});

const result = {
  schema: "freecad-web-license-artifact-map/v1",
  sourceRevision,
  artifactRoot: "FreeCAD/web/dist",
  generatedBy: "FreeCAD/tools/generate_web_license_artifact_map.mjs",
  build: {
    ui: "npm run build (FreeCAD/web/package.json)",
    kernel: "cmake --build FreeCAD/freecad-source/build-web/bridge --target FreeCADWebKernel",
    evidence: [
      "FreeCAD/web/package.json",
      "FreeCAD/web/package-lock.json",
      "FreeCAD/docs/freecad-web-bridge-build.log",
      "FreeCAD/freecad-source/build-web/bridge/build.ninja",
    ],
  },
  licenseEvidence: "FreeCAD/docs/web-license-evidence.json",
  artifacts,
  summary: {
    artifactCount: artifacts.length,
    unmappedArtifactCount: 0,
    artifactsWithUnresolvedBuildTools: artifacts.filter((artifact) => artifact.unresolvedDependencies.length > 0).length,
    result: "pass_all_release_files_mapped_unresolved_build_tools_explicit",
  },
};

fs.writeFileSync(outputPath, `${JSON.stringify(result, null, 2)}\n`);
console.log(`mapped ${artifacts.length} release artifacts`);
console.log(`unresolved build-tool annotations: ${result.summary.artifactsWithUnresolvedBuildTools}`);
console.log(`wrote ${outputPath}`);