import { readFile } from "node:fs/promises";
import path from "node:path";
import {
  contentDigest,
  kingWenEntries,
  validateContentPackage,
} from "./content-contract.mjs";
import { repositoryRoot } from "./repository-files.mjs";

const schemaPath = path.join(repositoryRoot, "content", "schema", "hexagram-content.schema.json");
const schema = JSON.parse(await readFile(schemaPath, "utf8"));
if (schema.$schema !== "https://json-schema.org/draft/2020-12/schema") {
  throw new Error("Content JSON Schema must use draft 2020-12");
}

const kotlinCatalogPath = path.join(
  repositoryRoot,
  "app",
  "src",
  "main",
  "java",
  "net",
  "opcapp",
  "flash",
  "domain",
  "casting",
  "HexagramCatalog.kt",
);
const kotlinCatalog = await readFile(kotlinCatalogPath, "utf8");
const kotlinPairPattern = /TrigramPair\(Trigram\.(\w+), Trigram\.(\w+)\) to (\d+)/gu;
const kotlinPairs = new Map(
  [...kotlinCatalog.matchAll(kotlinPairPattern)].map((match) => [
    `${match[1]}/${match[2]}`,
    Number(match[3]),
  ]),
);
const contractEntries = kingWenEntries();
if (kotlinPairs.size !== 64 || contractEntries.some((entry) =>
  kotlinPairs.get(`${entry.upperTrigram}/${entry.lowerTrigram}`) !== entry.kingWenNumber)) {
  throw new Error("Kotlin King Wen catalog and content-contract lookup must match exactly");
}

function validFixture() {
  return {
    schemaVersion: 1,
    contentVersion: "fixture-only-v1",
    specialUsageTexts: { qian: false, kun: false },
    sources: [{
      id: "fixture-source",
      title: "Automated test fixture",
      edition: "not publishable",
      license: "test data only",
      url: "https://example.invalid/fixture",
    }],
    hexagrams: contractEntries.map((entry) => ({
      ...entry,
      name: `fixture-${entry.kingWenNumber}`,
      symbol: `fixture-symbol-${entry.kingWenNumber}`,
      judgmentOriginal: "fixture original text",
      judgmentPlain: "fixture plain text",
      lineTextsBottomUp: Array.from({ length: 6 }, (_, index) => `fixture original line ${index + 1}`),
      linePlainBottomUp: Array.from({ length: 6 }, (_, index) => `fixture plain line ${index + 1}`),
      specialUsageText: null,
      sourceRefs: ["fixture-source"],
    })),
  };
}

function clone(value) {
  return structuredClone(value);
}

const fixture = validFixture();
const validErrors = validateContentPackage(fixture);
if (validErrors.length > 0) {
  throw new Error(`Valid content fixture was rejected:\n${validErrors.join("\n")}`);
}

const digest = contentDigest(fixture);
if (!/^[a-f0-9]{64}$/u.test(digest) || digest !== contentDigest(clone(fixture))) {
  throw new Error("Content digest must be a stable SHA-256 value");
}

const negativeCases = [
  ["unsupported schema", (value) => { value.schemaVersion = 2; }, "schemaVersion"],
  ["duplicate id", (value) => { value.hexagrams[1].kingWenNumber = 1; }, "unique"],
  ["wrong bottom-up pattern", (value) => { value.hexagrams[0].patternBottomUp[0] = "YIN"; }, "bottom-up"],
  ["five line texts", (value) => { value.hexagrams[0].lineTextsBottomUp.pop(); }, "exactly six"],
  ["unknown source", (value) => { value.hexagrams[0].sourceRefs = ["missing"]; }, "unknown source"],
  ["blank license", (value) => { value.sources[0].license = " "; }, "non-blank"],
  ["script content", (value) => { value.hexagrams[0].judgmentPlain = "<script>alert(1)</script>"; }, "script-like"],
  ["special declaration mismatch", (value) => { value.specialUsageTexts.qian = true; }, "specialUsageTexts.qian"],
];

for (const [name, mutate, expected] of negativeCases) {
  const candidate = clone(fixture);
  mutate(candidate);
  const errors = validateContentPackage(candidate);
  if (!errors.some((error) => error.includes(expected))) {
    throw new Error(`${name} fixture did not fail with '${expected}':\n${errors.join("\n")}`);
  }
}

console.log(
  `Content contract verification passed (64 entries cross-checked with Kotlin, ${negativeCases.length} negative fixtures, digest ${digest.slice(0, 12)}…).`,
);

const packagePath = path.join(repositoryRoot, "content", "packages", "hexagram-content.json");
const namesPath = path.join(
  repositoryRoot,
  "app",
  "src",
  "main",
  "java",
  "net",
  "opcapp",
  "flash",
  "core",
  "model",
  "HexagramNames.kt",
);
const namesSource = await readFile(namesPath, "utf8");
const namesBlock = namesSource.match(/private val names = listOf\(([\s\S]*?)\)/u);
if (!namesBlock) {
  throw new Error("HexagramNames.kt name table could not be parsed");
}
const catalogNames = [...namesBlock[1].matchAll(/"([^"]+)"/gu)].map((match) => match[1]);
if (catalogNames.length !== 64) {
  throw new Error("HexagramNames.kt must contain 64 names");
}

const published = JSON.parse(await readFile(packagePath, "utf8"));
const publishedErrors = validateContentPackage(published);
if (publishedErrors.length > 0) {
  throw new Error(`Published content package failed validation:\n${publishedErrors.join("\n")}`);
}
published.hexagrams.forEach((hexagram) => {
  const expectedName = catalogNames[hexagram.kingWenNumber - 1];
  const expectedSymbol = String.fromCodePoint(0x4DC0 + hexagram.kingWenNumber - 1);
  if (hexagram.name !== expectedName) {
    throw new Error(`Published package name for ${hexagram.kingWenNumber} must be ${expectedName}`);
  }
  if (hexagram.symbol !== expectedSymbol) {
    throw new Error(`Published package symbol for ${hexagram.kingWenNumber} must be ${expectedSymbol}`);
  }
});
if (published.contentVersion !== "zh-Hans-2026.1") {
  throw new Error("Published contentVersion must be zh-Hans-2026.1");
}
if (!published.specialUsageTexts.qian || !published.specialUsageTexts.kun) {
  throw new Error("Published package must include Qian 用九 and Kun 用六");
}
console.log(
  `Published content package ${published.contentVersion} passed (digest ${contentDigest(published).slice(0, 12)}…).`,
);