import assert from "node:assert/strict";
import { createHash } from "node:crypto";
import { readFileSync } from "node:fs";
import test from "node:test";
import type { ReportDocumentV1 } from "../src/lib/personal-report-contract.ts";
import {
  createPersonalReportService,
  PersonalReportServiceError,
  PERSONAL_REPORT_FAILURE_CODES,
  type PersonalReportDataClient,
  type PersonalReportQueryBuilder,
  type PersonalReportQueryResult,
} from "../src/lib/personal-report-service-core.ts";

const fixtureText = readFileSync(
  new URL("../../tests/fixtures/personal_report_document.v1.json", import.meta.url),
  "utf8",
);
const fixture: ReportDocumentV1 = JSON.parse(fixtureText);
const clone = () => structuredClone(fixture) as ReportDocumentV1;

const sha256 = (value: string) => createHash("sha256").update(value).digest("hex");

type MemoryRow = Record<string, unknown> & {
  id: string;
  user_id: string;
  request_id: string;
  request_fingerprint: string;
};

type LoggedOperation = Readonly<{
  operation: "select" | "insert" | "update" | "delete";
  columns: readonly string[];
  values: Readonly<Record<string, unknown>>;
}>;

class MemoryPersonalReportClient implements PersonalReportDataClient {
  rows = new Map<string, MemoryRow>();
  private nextId = 0;
  /** Recorded operations for owner-scoping privilege assertions. */
  log: LoggedOperation[] = [];

  from(table: "personal_reports"): PersonalReportQueryBuilder {
    if (table !== "personal_reports") throw new Error("unexpected table");
    return this.chain(this.newState());
  }

  private newState() {
    return {
      operation: "select" as "select" | "insert" | "update" | "delete",
      values: {} as Record<string, unknown>,
      filters: [] as { column: string; value: unknown }[],
    };
  }

  private chain(state: ReturnType<MemoryPersonalReportClient["newState"]>): PersonalReportQueryBuilder {
    // One shared state object per chain; every chained method mutates it and
    // returns a fresh view so .insert(...).select(...).single() works like the
    // real Supabase/local builders.

    const execute = (): PersonalReportQueryResult => {
      this.log.push({ operation: state.operation, columns: state.filters.map((f) => f.column), values: state.values });
      const matches = [...this.rows.values()].filter((row) =>
        state.filters.every(({ column, value }) => row[column] === value),
      );

      if (state.operation === "select") {
        return { data: matches, error: null };
      }
      if (state.operation === "insert") {
        const duplicate = [...this.rows.values()].some((row) =>
          row.user_id === state.values.user_id && row.request_id === state.values.request_id);
        if (duplicate) {
          return { data: null, error: { code: "23505", message: "duplicate key (user_id, request_id)" } };
        }
        const inflight = [...this.rows.values()].some((row) =>
          row.user_id === state.values.user_id && row.status === "generating");
        if (inflight) {
          return { data: null, error: { code: "23505", message: "one generating per user" } };
        }
        const id = typeof state.values.id === "string"
          ? state.values.id
          : `00000000-0000-4000-8000-${String(this.nextId++).padStart(12, "0")}`;
        const row = {
          evidence_hash: null,
          calculation_hash: null,
          failure_code: null,
          completed_at: null,
          report_document: null,
          session_id: null,
          chart_profile_id: null,
          skill_source_commit: null,
          ...state.values,
          id,
        } as unknown as MemoryRow;
        this.rows.set(id, row);
        return { data: [row], error: null };
      }
      if (state.operation === "update") {
        const updated: MemoryRow[] = [];
        for (const row of matches) {
          const next = { ...row, ...state.values } as MemoryRow;
          this.rows.set(row.id, next);
          updated.push(next);
        }
        return { data: updated, error: null };
      }
      const deletedCount = matches.length;
      for (const row of matches) this.rows.delete(row.id);
      return { data: null, error: null, count: deletedCount };
    };

    const wrap = (operation: typeof state.operation, values: Record<string, unknown> = {}) => {
      state.operation = operation;
      state.values = values;
      return this.chain(state);
    };

    return {
      select: () => this.chain(state),
      insert: (row) => wrap("insert", row as Record<string, unknown>),
      update: (values) => wrap("update", values as Record<string, unknown>),
      delete: () => wrap("delete"),
      eq: (column, value) => {
        state.filters.push({ column, value });
        return this.chain(state);
      },
      order: () => this.chain(state),
      limit: () => this.chain(state),
      maybeSingle: () => {
        const result = execute();
        const rows = Array.isArray(result.data) ? result.data : [];
        return Promise.resolve(rows.length > 1
          ? { data: null, error: { code: "PGRST116", message: "unexpected row count" } }
          : { data: rows[0] ?? null, error: null });
      },
      single: () => {
        const result = execute();
        const rows = Array.isArray(result.data) ? result.data : [];
        return Promise.resolve(rows.length === 1
          ? { data: rows[0], error: null }
          : { data: null, error: { code: "PGRST116", message: "unexpected row count" } });
      },
      then: (onfulfilled, onrejected) =>
        Promise.resolve(execute()).then(onfulfilled, onrejected),
    };
  }
}

function setup(now = new Date("2026-08-06T08:00:00Z")) {
  const client = new MemoryPersonalReportClient();
  const service = createPersonalReportService(client, { now: () => now });
  return { client, service, now };
}

const ownerId = "11111111-1111-4111-8111-111111111111";
const otherId = "22222222-2222-4222-8222-222222222222";
const requestId = "33333333-3333-4333-8333-333333333333";
const fingerprintA = sha256("request-intent-a");
const fingerprintB = sha256("request-intent-b");

function generatingInput(overrides: Record<string, unknown> = {}) {
  return {
    userId: ownerId,
    requestId,
    requestFingerprint: fingerprintA,
    reportType: "personal_full" as const,
    presentationMode: "default" as const,
    requestedThemes: ["career", "marriage"],
    skillSnapshotSha256: "a".repeat(64),
    skillSourceCommit: "b".repeat(40),
    ...overrides,
  };
}

test("createGenerating inserts a generating record with fingerprint", async () => {
  const { service } = setup();
  const result = await service.createGenerating(generatingInput());
  assert.equal(result.kind, "created");
  if (result.kind !== "created") return;
  assert.equal(result.record.status, "generating");
  assert.equal(result.record.requestFingerprint, fingerprintA);
  assert.equal(result.record.schemaVersion, "report_document.v1");
  assert.deepEqual(result.record.requestedThemes, ["career", "marriage"]);
  assert.equal(result.record.reportDocument, null);
  assert.equal(result.record.failureCode, null);
});

test("same requestId and fingerprint replays idempotently", async () => {
  const { service } = setup();
  const first = await service.createGenerating(generatingInput());
  assert.equal(first.kind, "created");
  const replay = await service.createGenerating(generatingInput());
  assert.equal(replay.kind, "replayed");
  if (first.kind !== "created" || replay.kind !== "replayed") return;
  assert.equal(replay.record.id, first.record.id);
  const byRequest = await service.getByUserAndRequestId(ownerId, requestId);
  assert.equal(byRequest?.id, first.record.id);
});

test("same requestId with a different fingerprint is request_conflict, never replay", async () => {
  const { service } = setup();
  await service.createGenerating(generatingInput());
  const conflict = await service.createGenerating(generatingInput({ requestFingerprint: fingerprintB }));
  assert.equal(conflict.kind, "request_conflict");
  if (conflict.kind !== "request_conflict") return;
  assert.equal(conflict.record.requestFingerprint, fingerprintA);
});

test("a second in-flight generation for the same user is generation_in_progress", async () => {
  const { service } = setup();
  await service.createGenerating(generatingInput());
  const second = await service.createGenerating(generatingInput({
    requestId: "44444444-4444-4444-8444-444444444444",
    requestFingerprint: sha256("other-intent"),
  }));
  assert.equal(second.kind, "generation_in_progress");
});

test("createGenerating validates fingerprints, uuids and hashes", async () => {
  const { service } = setup();
  const rejectsWithInvalidRequest = (input: Record<string, unknown>) =>
    assert.rejects(
      service.createGenerating(generatingInput(input)),
      (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_request",
    );
  await rejectsWithInvalidRequest({ requestFingerprint: "not-a-sha" });
  await rejectsWithInvalidRequest({ requestId: "nope" });
  await rejectsWithInvalidRequest({ skillSnapshotSha256: "short" });
  await rejectsWithInvalidRequest({ reportType: "personal_unknown" });
  await rejectsWithInvalidRequest({ userId: "not-a-uuid" });
});

test("reads are owner-scoped", async () => {
  const { service } = setup();
  await service.createGenerating(generatingInput());
  const own = await service.getByUserAndRequestId(ownerId, requestId);
  if (!own) throw new Error("missing own record");
  assert.equal(await service.getByUserAndRequestId(otherId, requestId), null);

  const byId = await service.getOwnedById(ownerId, own.id);
  assert.equal(byId?.id, own.id);
  assert.equal(await service.getOwnedById(otherId, own.id), null);
});

test("completeReady validates the contract and stores recomputed hashes", async () => {
  const { service, now } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  const document = clone();
  document.reportId = created.record.id;
  const ready = await service.completeReady(ownerId, created.record.id, document);
  assert.equal(ready.status, "ready");
  assert.equal(ready.reportDocument?.schemaVersion, "report_document.v1");
  assert.equal(ready.evidenceHash, fixture.provenance.evidenceHash);
  assert.equal(ready.calculationHash, document.provenance.calculationHash);
  assert.equal(ready.completedAt, now.toISOString());
});

test("completeReady rejects document reportId mismatch and tampered evidence", async () => {
  const { service } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  const wrongId = clone();
  wrongId.reportId = requestId;
  await assert.rejects(
    service.completeReady(ownerId, created.record.id, wrongId),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_document",
  );

  const tampered = clone();
  tampered.reportId = created.record.id;
  tampered.evidenceAppendix.calculationEvidence[0].value = "篡改后的证据值";
  await assert.rejects(
    service.completeReady(ownerId, created.record.id, tampered),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_document",
  );
});

test("completeReady rejects non-generating states and foreign owners", async () => {
  const { service } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  const document = clone();
  document.reportId = created.record.id;
  await service.markFailed(ownerId, created.record.id, "model_unavailable");

  await assert.rejects(
    service.completeReady(ownerId, created.record.id, document),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_state",
  );
  await assert.rejects(
    service.completeReady(otherId, created.record.id, document),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "not_found",
  );
});

test("markFailed uses only stable failure codes", async () => {
  const { service } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  await assert.rejects(
    service.markFailed(ownerId, created.record.id, "model said something bad"),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_failure_code",
  );

  const failed = await service.markFailed(ownerId, created.record.id, "model_unavailable");
  assert.equal(failed.status, "failed");
  assert.equal(failed.failureCode, "model_unavailable");
  assert.equal(failed.reportDocument, null);
  assert.equal(failed.completedAt, null);

  await assert.rejects(
    service.markFailed(ownerId, created.record.id, "report_rate_limited"),
    (error: unknown) => error instanceof PersonalReportServiceError && error.code === "invalid_state",
  );
  assert.deepEqual(PERSONAL_REPORT_FAILURE_CODES, [
    "profile_incomplete",
    "birth_time_not_usable",
    "report_generation_in_progress",
    "report_rate_limited",
    "calculation_unavailable",
    "model_unavailable",
    "report_schema_invalid",
    "report_guard_rejected",
    "report_not_found",
  ]);
});

test("deleteOwned removes only the owner's record", async () => {
  const { service, client } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  assert.equal(await service.deleteOwned(otherId, created.record.id), false);
  assert.ok(client.rows.has(created.record.id));
  assert.equal(await service.deleteOwned(ownerId, created.record.id), true);
  assert.equal(client.rows.has(created.record.id), false);
  assert.equal(await service.deleteOwned(ownerId, created.record.id), false);
});

test("every write and read operation is owner-scoped", async () => {
  const { service, client } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;

  const document = clone();
  document.reportId = created.record.id;
  await service.getOwnedById(ownerId, created.record.id);
  await service.getByUserAndRequestId(ownerId, requestId);
  await service.completeReady(ownerId, created.record.id, document);
  await service.deleteOwned(ownerId, created.record.id);

  for (const entry of client.log) {
    if (entry.operation === "insert") {
      assert.equal(entry.values.user_id, ownerId, "insert row must carry the caller user_id");
    } else {
      assert.ok(entry.columns.includes("user_id"), `${entry.operation} missing user_id filter`);
    }
  }
  const statefulWrites = client.log.filter((entry) => entry.operation === "update" || entry.operation === "delete");
  assert.ok(statefulWrites.length > 0);
  for (const entry of statefulWrites) {
    assert.ok(entry.columns.includes("id"), `${entry.operation} missing id filter`);
  }
});

test("failed records are never implicitly resurrected by createGenerating", async () => {
  const { service } = setup();
  const created = await service.createGenerating(generatingInput());
  assert.equal(created.kind, "created");
  if (created.kind !== "created") return;
  await service.markFailed(ownerId, created.record.id, "model_unavailable");

  // Same requestId + same fingerprint after failure: replay reports the failed
  // record as-is; the service never flips it back to generating.
  const replay = await service.createGenerating(generatingInput());
  assert.equal(replay.kind, "replayed");
  if (replay.kind !== "replayed") return;
  assert.equal(replay.record.status, "failed");
  assert.equal(replay.record.failureCode, "model_unavailable");
});