import { createHash } from "node:crypto";
import { mkdir, readFile, writeFile } from "node:fs/promises";

import { verifyCompatibilityTuple } from "../src/application/policies/compatibility.js";
import {
  compareReleaseToRuntime,
  RELEASE_TOKEN_REGISTRY,
} from "../src/contracts/release-tokens.js";
import { ROUTE_RUNTIME_CONTRACT } from "../src/contracts/route-runtime-contract.js";
import { ROUTE_REGISTRY } from "../src/contracts/routes.js";

const fixturesDocument =
  /** @type {{
   *   fixtures: Array<{
   *     name: string,
   *     expectedCompatible: boolean,
   *     frontend: {
   *       buildId: string,
   *       configSchemaVersion: string,
   *       apiContractVersion: string,
   *       assetManifestHash: string,
   *       releaseId: string
   *     },
   *     runtime: {
   *       buildId: string,
   *       configSchemaVersion: string,
   *       apiContractVersion: string,
   *       assetManifestHash: string,
   *       releaseId: string
   *     }
   *   }>
   * }} */ (
    JSON.parse(
      await readFile("config/release/coherence-fixtures.json", "utf8"),
    )
  );
const release = JSON.parse(await readFile("dist/release-manifest.json", "utf8"));
const runtimeConfig = JSON.parse(await readFile("dist/config.json", "utf8"));
const buildManifest = JSON.parse(
  await readFile("artifacts/release/build-manifest.json", "utf8"),
);
const runtimeConfigJsonSchema = JSON.parse(
  await readFile("dist/runtime-config.schema.json", "utf8"),
);
const viteManifest = await readFile("dist/.vite/manifest.json", "utf8");
const viteManifestObject =
  /** @type {Record<string, {file: string, name?: string, isDynamicEntry?: boolean}>} */ (
    JSON.parse(viteManifest)
  );
const actualAssetManifestHash = createHash("sha256")
  .update(viteManifest)
  .digest("hex");

const artifactComparison = compareReleaseToRuntime(release, runtimeConfig);
const artifactMismatches = [...artifactComparison.mismatches];
for (const token of Object.keys(RELEASE_TOKEN_REGISTRY)) {
  if (typeof release[token] !== "string" || release[token].length === 0) {
    artifactMismatches.push(`releaseToken:${token}`);
  }
}
if (!Number.isFinite(Date.parse(release.builtAt))) {
  artifactMismatches.push("releaseToken:builtAtFormat");
}
if (release.assetManifestHash !== actualAssetManifestHash) {
  artifactMismatches.push("assetManifestContent");
}
if (
  runtimeConfigJsonSchema.$schema !== "https://json-schema.org/draft/2020-12/schema" ||
  runtimeConfigJsonSchema.type !== "object" ||
  !runtimeConfigJsonSchema.properties
) {
  artifactMismatches.push("runtimeConfigSchema");
}
if (
  buildManifest.outputs?.runtimeConfigSchema !==
  "dist/runtime-config.schema.json"
) {
  artifactMismatches.push("buildManifest:runtimeConfigSchema");
}

const expectedChunkIds = new Set(
  Object.values(ROUTE_REGISTRY).map((definition) => definition.chunkId),
);
const actualChunkIds = new Set(Object.keys(release.routeChunks ?? {}));
for (const chunkId of expectedChunkIds) {
  if (!actualChunkIds.has(chunkId)) {
    artifactMismatches.push(`routeChunk:missing:${chunkId}`);
  }
}
for (const chunkId of actualChunkIds) {
  if (!expectedChunkIds.has(chunkId)) {
    artifactMismatches.push(`routeChunk:orphan:${chunkId}`);
  }
}
for (const definition of Object.values(ROUTE_REGISTRY)) {
  const runtime =
    /** @type {Record<string, {moduleId: string}>} */ (
      ROUTE_RUNTIME_CONTRACT
    )[definition.routeId];
  const viteEntry = Object.values(viteManifestObject).find(
    (entry) => entry.name === runtime?.moduleId && entry.isDynamicEntry,
  );
  const routeAsset = release.routeChunks?.[definition.chunkId];
  if (!runtime || !viteEntry || routeAsset !== viteEntry.file) {
    artifactMismatches.push(`routeChunk:mismatch:${definition.chunkId}`);
    continue;
  }
  if (
    buildManifest.outputs?.routeChunks?.[definition.chunkId] !== routeAsset
  ) {
    artifactMismatches.push(`buildManifest:routeChunk:${definition.chunkId}`);
  }
  try {
    await readFile(`dist/${routeAsset}`);
  } catch {
    artifactMismatches.push(`routeChunk:file:${definition.chunkId}`);
  }
}

const fixtures = fixturesDocument.fixtures.map((fixture) => {
  const result = verifyCompatibilityTuple({
    frontend: fixture.frontend,
    runtime: fixture.runtime,
  });
  return {
    name: fixture.name,
    expectedCompatible: fixture.expectedCompatible,
    actualCompatible: result.compatible,
    mismatches: result.mismatches,
    passed: result.compatible === fixture.expectedCompatible,
  };
});
const artifact = {
  checked: true,
  compatible: artifactComparison.compatible && artifactMismatches.length === 0,
  mismatches: artifactMismatches,
  releaseId: release.releaseId,
};
const passed = artifact.compatible && fixtures.every((fixture) => fixture.passed);
const report = {
  schemaVersion: 1,
  generatedAt: new Date().toISOString(),
  artifact,
  fixtures,
  passed,
};

await mkdir("artifacts/release", { recursive: true });
await writeFile(
  "artifacts/release/verification.json",
  `${JSON.stringify(report, null, 2)}\n`,
);

if (!passed) {
  process.stderr.write(
    `Release coherence failed: ${artifactMismatches.join(", ") || "fixture"}\n`,
  );
  process.exit(1);
}
process.stdout.write(
  `Release coherence: PASS (${fixtures.length - 1} mixed fixtures rejected)\n`,
);