import assert from "node:assert/strict";
import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import test from "node:test";
import { CatalogError } from "../../src/modules/catalog/errors.js";
import type { EmbeddingProvider } from "../../src/modules/embeddings/provider.js";
import { PostgresOcrIndexingStore, OcrReadyIndexingService, type ApprovedOcrCandidate } from "../../src/modules/ocr/indexing.js";
import { persistReviewedPagesArtifact } from "../../src/modules/ocr/artifacts.js";
import { chunkDocument, documentalChunkingPolicy } from "../../src/modules/process/chunking.js";
import type { VectorStoreClient } from "../../src/modules/vectorstore/client.js";
import { buildChunkId, buildVersionedQdrantPointId, canonicalJson, normalizeContentForHash, sha256Hex } from "../../src/shared/utils/ids.js";

const versionId = "eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee";
const documentId = "doc:indexed-review";
const sourceId = "src:reviewed";

async function fixture(rootDirectory: string) {
  const first = "Reviewed alpha content. ".repeat(110);
  const second = "Reviewed beta content.";
  const lines = [first, second].map((text, index) => ({
    lineId: `line-${index + 1}`, text, confidence: 0.97, bbox: [0, index * 10, 50, index * 10 + 8] as [number, number, number, number], lineSha256: sha256Hex(text)
  }));
  const pages = lines.map((line, index) => ({ page: index + 1, method: "ocr" as const, nativeText: "", rawOcrText: line.text,
    candidateText: line.text, candidateTextSha256: sha256Hex(line.text), risks: [], lines: [line],
    nativeTextSha256: sha256Hex(""), ocrTextSha256: sha256Hex(line.text), metrics: { medianConfidence: 0.97 } }));
  const documents = [{ documentId, text: `${first}\n\n${second}`, textSha256: sha256Hex(`${first}\n\n${second}`), pages }];
  const candidateSha256 = sha256Hex(canonicalJson(documents));
  const reviewedText = `${first}\n\n${second}`;
  await mkdir(path.join(rootDirectory, versionId));
  await writeFile(path.join(rootDirectory, versionId, "candidate-pages.json"), canonicalJson({ schemaVersion: "1", versionId, candidateSha256, documents }), { mode: 0o600 });
  await persistReviewedPagesArtifact({ rootDirectory, versionId, sourceId, candidateSha256, reviewedTextSha256: sha256Hex(reviewedText),
    reviewedBy: "reviewer", documents: [{ documentId, pages: pages.map(({ page, candidateText, lines: ocrLines }) => ({ page, candidateText, ocr: { lines: ocrLines } })) }] });
  return { reviewedText, pages };
}

function candidate(reviewedText: string): ApprovedOcrCandidate {
  return { versionId, sourceId, state: "indexing", activateRequested: true, expectedActiveVersionId: "active-1",
    reviewedText, reviewedTextSha256: sha256Hex(reviewedText), processingFingerprint: "fingerprint", metadataHash: "metadata" };
}

function harness(pageCount: number, options: { embeddingFailure?: boolean; countOffset?: number } = {}) {
  const sql: string[] = [];
  const points: Array<{ id: string; vector: number[]; payload: Record<string, unknown> }> = [];
  let embedCalls = 0;
  const rows = Array.from({ length: pageCount }, (_, index) => ({
    version_id: versionId, source_id: sourceId, version_number: 4, state: "indexing", base_active_version_id: "active-1",
    current_active_version_id: "active-1", processing_fingerprint: "fingerprint", metadata_hash: "metadata", tags: ["reviewed"],
    embedding_provider: "test-provider", embedding_model: "test-model", embedding_dimensions: 3, qdrant_collection: "rag_documents",
    expected_document_count: 1, document_id: documentId, document_key: "review.pdf", title: "review.pdf", mime_type: "application/pdf",
    page_number: index + 1, reviewed_text_hash: "pending"
  }));
  const query = async (statement: string, params?: unknown[]) => {
    sql.push(statement);
    if (/^(BEGIN|COMMIT|ROLLBACK|SET CONSTRAINTS)/u.test(statement.trim())) return { rowCount: 0, rows: [] };
    if (statement.includes("FROM rag_source_versions v")) return { rowCount: rows.length, rows };
    if (statement.includes("UPDATE rag_version_documents")) return { rowCount: 1, rows: [] };
    if (statement.includes("UPDATE rag_source_versions")) return { rowCount: 1, rows: [{ version_id: versionId }] };
    throw new Error(`Unexpected SQL: ${statement} ${String(params)}`);
  };
  const pool = { query, async connect() { return { query, release() {} }; } };
  const embeddings: EmbeddingProvider = { providerName: "test-provider", modelName: "test-model", dimensions: 3,
    async embed(input) { embedCalls += 1; if (options.embeddingFailure) throw new Error("embedding unavailable"); return input.map(() => [0.1, 0.2, 0.3]); } };
  const vectors: Partial<VectorStoreClient> = { kind: "fake", async upsert(chunks) { points.push(...chunks); },
    async countVersionPoints() { return points.length + (options.countOffset ?? 0); } };
  return { pool: pool as never, embeddings, vectors: vectors as VectorStoreClient, points, sql, embedCalls: () => embedCalls };
}

test("reviewed artifact indexing survives restart and writes canonical versioned chunks before ready", async (context) => {
  const rootDirectory = await mkdtemp(path.join(os.tmpdir(), "rag-reviewed-index-"));
  context.after(() => rm(rootDirectory, { recursive: true, force: true }));
  const { reviewedText, pages } = await fixture(rootDirectory);
  const runtime = harness(pages.length);
  const originalQuery = (runtime.pool as { query: (sql: string, params?: unknown[]) => Promise<{ rowCount: number; rows: Array<Record<string, unknown>> }> }).query;
  for (let index = 0; index < pages.length; index += 1) {
    const row = (await originalQuery("SELECT * FROM rag_source_versions v", [])).rows[index]!;
    row.reviewed_text_hash = sha256Hex(pages[index]!.candidateText);
  }
  const restarted = new PostgresOcrIndexingStore(runtime.pool, rootDirectory, runtime.embeddings, runtime.vectors);
  const result = await new OcrReadyIndexingService(restarted).index(candidate(reviewedText));

  const expected = chunkDocument("review.pdf", normalizeContentForHash(reviewedText), documentalChunkingPolicy);
  assert.deepEqual(result, { versionId, state: "ready", activated: false });
  assert.equal(runtime.points.length, expected.length);
  assert.deepEqual(runtime.points.map(({ id }) => id), expected.map((chunk) => buildVersionedQdrantPointId(versionId, buildChunkId(documentId, "documental", chunk.index))));
  assert.ok(runtime.points.every(({ payload }) => payload.processing_fingerprint === "fingerprint" && payload.source_version_id === versionId));
  assert.match(runtime.sql.join("\n"), /SET state = 'ready'/u);
  assert.doesNotMatch(runtime.sql.join("\n"), /active_version_id\s*=/u);
});

test("identity, corrupt artifact, embedding, and partial-write failures remain fail closed", async (context) => {
  const rootDirectory = await mkdtemp(path.join(os.tmpdir(), "rag-reviewed-index-fail-"));
  context.after(() => rm(rootDirectory, { recursive: true, force: true }));
  const { reviewedText, pages } = await fixture(rootDirectory);
  for (const scenario of [
    { name: "identity", runtime: harness(pages.length), value: { ...candidate(reviewedText), processingFingerprint: "wrong" } },
    { name: "embedding", runtime: harness(pages.length, { embeddingFailure: true }), value: candidate(reviewedText) },
    { name: "count", runtime: harness(pages.length, { countOffset: -1 }), value: candidate(reviewedText) }
  ]) {
    await assert.rejects(new OcrReadyIndexingService(new PostgresOcrIndexingStore(scenario.runtime.pool, rootDirectory, scenario.runtime.embeddings, scenario.runtime.vectors)).index(scenario.value),
      scenario.name === "count" ? (error) => error instanceof CatalogError && error.code === "SOURCE_VERSION_INCONSISTENT" : Error);
    assert.doesNotMatch(scenario.runtime.sql.join("\n"), /SET state = 'ready'/u);
    if (scenario.name === "identity") assert.equal(scenario.runtime.embedCalls(), 0);
  }
  await writeFile(path.join(rootDirectory, versionId, "reviewed-pages.json"), "corrupt", { mode: 0o600 });
  const corrupt = harness(pages.length);
  await assert.rejects(new OcrReadyIndexingService(new PostgresOcrIndexingStore(corrupt.pool, rootDirectory, corrupt.embeddings, corrupt.vectors)).index(candidate(reviewedText)), /integrity validation failed/u);
  assert.equal(corrupt.embedCalls(), 0);
  assert.equal(corrupt.points.length, 0);
});