import { createHash } from "node:crypto";
import { spawnSync } from "node:child_process";
import { existsSync, readFileSync } from "node:fs";

import { WP4_07_RED_RESOURCE_VERSION, WP4_07_SOURCE_HASHES, assertWp407Fixture } from "../../tests/visual-performance/wp4-07-fixture.mjs";

export const WP4_07_REQUIRED_WP5_BRANCHES = Object.freeze(
  Array.from({ length: 7 }, (_, index) => `codex/wp5-0${index + 1}`),
);

export function validateWp407FrozenInputs() {
  const mismatches = [];
  for (const [path, expected] of Object.entries(WP4_07_SOURCE_HASHES)) {
    if (!existsSync(path)) {
      mismatches.push({ actual: null, expected, path });
      continue;
    }
    const actual = createHash("sha256").update(readFileSync(path)).digest("hex").toUpperCase();
    if (actual !== expected) mismatches.push({ actual, expected, path });
  }
  if (mismatches.length > 0) {
    const error = new Error("WP4_07_FROZEN_SOURCE_CHANGED");
    error.details = mismatches;
    throw error;
  }
  return assertWp407Fixture();
}

export function readWp5RemoteGate() {
  const result = spawnSync("git", ["ls-remote", "--heads", "origin", "codex/wp5-*"], { encoding: "utf8", timeout: 30_000 });
  if ((result.status ?? 1) !== 0) {
    const error = new Error("WP4_07_GITEA_GATE_UNREADABLE");
    error.details = { exit_code: result.status ?? 1 };
    throw error;
  }
  const heads = Object.fromEntries(result.stdout.trim().split(/\r?\n/).filter(Boolean).map((line) => {
    const [sha, reference] = line.split(/\s+/);
    return [reference.replace("refs/heads/", ""), sha];
  }));
  const missing_branches = WP4_07_REQUIRED_WP5_BRANCHES.filter((branch) => !/^[0-9a-f]{40}$/.test(heads[branch] ?? ""));
  return {
    complete: missing_branches.length === 0,
    heads,
    missing_branches,
    required_branches: WP4_07_REQUIRED_WP5_BRANCHES,
  };
}

export function validateWp5FinalManifest(path) {
  if (!path || !existsSync(path)) throw new Error("WP4_07_FINAL_ASSET_MANIFEST_REQUIRED");
  const raw = readFileSync(path, "utf8");
  if (raw.includes(WP4_07_RED_RESOURCE_VERSION) || raw.includes("fixture-v1")) throw new Error("WP4_07_PLACEHOLDER_ASSET_REJECTED");
  const manifest = JSON.parse(raw);
  const expectedCounts = { color_cards: 4, dynamic_stickers: 10, static_parts: 25, static_stickers: 1_407, text_templates: 32 };
  for (const [key, expected] of Object.entries(expectedCounts)) {
    if (manifest.counts?.[key] !== expected) throw new Error(`WP4_07_FINAL_MANIFEST_COUNT_MISMATCH:${key}`);
  }
  if (!manifest.release_version || String(manifest.release_version).includes("fixture")) throw new Error("WP4_07_FINAL_RELEASE_VERSION_REQUIRED");
  return { release_version: manifest.release_version, sha256: createHash("sha256").update(raw).digest("hex").toUpperCase() };
}