import { describe, it } from "node:test";
import assert from "node:assert/strict";
import { Readable } from "node:stream";
import { PostgresInterface } from "../../../src/db/postgres/PostgresInterface.js";
import type { WrappedPgClient } from "../../../src/db/postgres/pool.js";
import type { SqlCode } from "../../../src/db/postgres/sql.js";

// The postgres backend has no CI database, so these tests drive the real
// PostgresInterface.export/import code paths against an in-memory fake client.
// They verify control flow (NDJSON shape, meta.source, filtering, note
// skipping, counts, insert dispatch, abort -> rollback); the SQL-arg forms are
// the same {uuid}/{text}/{jsonb}/{date} patterns the pg backend's own CRUD
// already exercises against real Postgres.

interface Rows {
  users?: Record<string, unknown>[];
  abodes?: Record<string, unknown>[];
  residents?: Record<string, unknown>[];
  apikeys?: Record<string, unknown>[];
}

class FakePg implements WrappedPgClient {
  readonly = false;
  inserts: { table: string; vars: unknown[] }[] = [];
  committed = false;
  rolledBack = false;
  #rows: Rows;

  constructor(rows: Rows = {}) {
    this.#rows = rows;
  }

  async destroy(): Promise<void> {}

  async all<R>(stmt: SqlCode): Promise<R[]> {
    const s = stmt._sql;
    if (s.includes('FROM "users"')) return (this.#rows.users ?? []) as R[];
    if (s.includes('FROM "abodes"')) return (this.#rows.abodes ?? []) as R[];
    if (s.includes('FROM "residents"'))
      return (this.#rows.residents ?? []) as R[];
    if (s.includes('FROM "apikeys"')) return (this.#rows.apikeys ?? []) as R[];
    return [] as R[];
  }

  async get<R>(stmt: SqlCode): Promise<R | null> {
    const rows = await this.all<R>(stmt);
    return rows[0] ?? null;
  }

  async run(stmt: SqlCode): Promise<{ changes: number }> {
    const table = stmt._sql.match(/INSERT INTO "(\w+)"/)?.[1] ?? "?";
    this.inserts.push({ table, vars: stmt._vars });
    return { changes: 1 };
  }

  async multi<R>(fn: (tx: WrappedPgClient) => Promise<R>): Promise<R> {
    try {
      const r = await fn(this);
      this.committed = true;
      return r;
    } catch (e) {
      this.rolledBack = true;
      throw e;
    }
  }

  async rethrow<R>(fn: () => Promise<R>): Promise<R> {
    return fn();
  }
}

const iso = "2026-01-02T03:04:05.000Z";

function seededRows(): Rows {
  return {
    users: [
      {
        uid: "11111111-1111-1111-1111-111111111111",
        email: "u1@test.example",
        name: "User One",
        flags: {},
        created_at: new Date(iso),
        updated_at: new Date(iso),
      },
    ],
    abodes: [
      {
        aid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1",
        name: "Abode One",
        created_at: new Date(iso),
        created_by: "11111111-1111-1111-1111-111111111111",
        updated_at: new Date(iso),
        updated_by: null,
      },
      {
        aid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa2",
        name: "Abode Two",
        created_at: new Date(iso),
        created_by: null,
        updated_at: new Date(iso),
        updated_by: null,
      },
    ],
    residents: [
      {
        uid: "11111111-1111-1111-1111-111111111111",
        aid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1",
        flags: {},
        created_at: new Date(iso),
        created_by: null,
        updated_at: new Date(iso),
        updated_by: null,
      },
    ],
    apikeys: [
      {
        uid: "11111111-1111-1111-1111-111111111111",
        kid: "kkkkkkkk-kkkk-kkkk-kkkk-kkkkkkkkkkk1",
        name: "key one",
        permissions: {},
        created_at: new Date(iso),
        expires_at: null,
      },
    ],
  };
}

async function streamToString(s: NodeJS.ReadableStream): Promise<string> {
  let out = "";
  for await (const chunk of s) out += chunk;
  return out;
}
function parseLines(ndjson: string): { kind: string; data: any }[] {
  return ndjson
    .split("\n")
    .filter(Boolean)
    .map((l) => JSON.parse(l));
}
function line(kind: string, data: unknown): string {
  return JSON.stringify({ kind, data }) + "\n";
}

describe("postgres export", () => {
  it("streams meta + the four supported kinds, never note", async () => {
    const db = new PostgresInterface(new FakePg(seededRows()));
    const lines = parseLines(await streamToString(db.export()));

    const meta = lines.find((l) => l.kind === "meta");
    assert.ok(meta);
    assert.equal(meta!.data.source, "postgres");
    assert.equal(meta!.data.v, 1);

    const kinds = new Set(lines.map((l) => l.kind));
    assert.ok(kinds.has("user"));
    assert.ok(kinds.has("abode"));
    assert.ok(kinds.has("resident"));
    assert.ok(kinds.has("apikey"));
    assert.ok(!kinds.has("note"), "note is unsupported on postgres");
  });

  it("applies the kinds filter", async () => {
    const db = new PostgresInterface(new FakePg(seededRows()));
    const lines = parseLines(
      await streamToString(db.export({ filter: { kinds: ["abode"] } })),
    );
    const kinds = new Set(
      lines.filter((l) => l.kind !== "meta").map((l) => l.kind),
    );
    assert.deepEqual(kinds, new Set(["abode"]));
  });

  it("applies the abodes allowlist to abode/resident records", async () => {
    const db = new PostgresInterface(new FakePg(seededRows()));
    const lines = parseLines(
      await streamToString(
        db.export({
          filter: { abodes: ["aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1"] },
        }),
      ),
    );
    const abodeAids = lines
      .filter((l) => l.kind === "abode")
      .map((l) => l.data.aid);
    assert.deepEqual(abodeAids, ["aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1"]);
  });
});

describe("postgres import", () => {
  it("dispatches inserts per kind, skips note, and commits", async () => {
    const fake = new FakePg();
    const db = new PostgresInterface(fake);
    const source = Readable.from([
      line("meta", { v: 1 }),
      line("user", {
        uid: "11111111-1111-1111-1111-111111111111",
        email: "u1@test.example",
        name: "User One",
        flags: {},
        created_at: iso,
        updated_at: iso,
      }),
      line("abode", {
        aid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1",
        name: "Abode One",
        created_at: iso,
        created_by: "11111111-1111-1111-1111-111111111111",
        updated_at: iso,
        updated_by: null,
      }),
      line("apikey", {
        uid: "11111111-1111-1111-1111-111111111111",
        kid: "kkkkkkkk-kkkk-kkkk-kkkk-kkkkkkkkkkk1",
        name: "key one",
        permissions: {},
        created_at: iso,
        expires_at: null,
      }),
      // note lines are silently skipped on postgres
      line("note", {
        nid: "nnnnnnnn-nnnn-nnnn-nnnn-nnnnnnnnnnn1",
        aid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1",
        name: "Note",
        content: "x",
        properties: {},
        created_at: iso,
        created_by: null,
        updated_at: iso,
        updated_by: null,
      }),
    ]);

    const result = await db.import(source);
    assert.deepEqual(result.counts, { user: 1, abode: 1, apikey: 1 });
    assert.ok(fake.committed);
    assert.deepEqual(fake.inserts.map((i) => i.table).sort(), [
      "abodes",
      "apikeys",
      "users",
    ]);
    assert.ok(!fake.inserts.some((i) => i.table === "notes"), "no note insert");
    // apikey gets a freshly-minted token (never exported)
    const apikeyInsert = fake.inserts.find((i) => i.table === "apikeys")!;
    assert.ok(
      apikeyInsert.vars.some(
        (v) => typeof v === "string" && v.startsWith("at_"),
      ),
      "apikey insert carries a fresh token",
    );
  });

  it("rejects and rolls back when the stream carries an error sentinel", async () => {
    const fake = new FakePg();
    const db = new PostgresInterface(fake);
    const source = Readable.from([
      line("meta", { v: 1 }),
      line("user", {
        uid: "11111111-1111-1111-1111-111111111111",
        email: "u1@test.example",
        name: "User One",
        flags: {},
        created_at: iso,
        updated_at: iso,
      }),
      line("error", { message: "boom" }),
    ]);

    await assert.rejects(() => db.import(source), /boom/);
    assert.ok(fake.rolledBack);
    assert.ok(!fake.committed);
  });

  it("rejects and rolls back on signal abort", async () => {
    const fake = new FakePg();
    const db = new PostgresInterface(fake);
    const ac = new AbortController();
    const source = Readable.from(
      (async function* () {
        yield line("meta", { v: 1 });
        yield line("user", {
          uid: "11111111-1111-1111-1111-111111111111",
          email: "u1@test.example",
          name: "User One",
          flags: {},
          created_at: iso,
          updated_at: iso,
        });
        ac.abort();
        await new Promise((r) => setTimeout(r, 1000));
      })(),
    );

    await assert.rejects(() => db.import(source, { signal: ac.signal }));
    assert.ok(fake.rolledBack);
    assert.ok(!fake.committed);
  });
});