// Flags: --expose-gc
'use strict';

const { mustCall, skipIfSQLiteMissing } = require('../common');
skipIfSQLiteMissing();

const assert = require('node:assert');
const dc = require('node:diagnostics_channel');
const { Database } = require('node:sqlite');
const { suite, it } = require('node:test');
const { gcUntil } = require('../common/gc');

suite('sqlite.db.query diagnostics channel', () => {
  it('subscriber receives SQL string for exec() statements', (t) => {
    const calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');
    db.exec('INSERT INTO t VALUES (1)');

    assert.strictEqual(calls.length, 2);
    assert.strictEqual(calls[0].sql, 'CREATE TABLE t (x INTEGER)');
    assert.strictEqual(calls[1].sql, 'INSERT INTO t VALUES (1)');
  });

  it('subscriber receives SQL string for prepared INSERT statements', (t) => {
    let calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');
    calls = []; // reset after setup

    using stmt = db.prepare('INSERT INTO t VALUES (?)');
    stmt.run(42);

    assert.strictEqual(calls.length, 1);
    assert.strictEqual(calls[0].sql, 'INSERT INTO t VALUES (42.0)');
  });

  it('subscriber receives SQL string for prepared SELECT statements', (t) => {
    let calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');
    db.exec('INSERT INTO t VALUES (1)');
    calls = []; // reset after setup

    using stmt = db.prepare('SELECT x FROM t WHERE x = ?');
    stmt.get(1);

    assert.strictEqual(calls.length, 1);
    assert.strictEqual(calls[0].sql, 'SELECT x FROM t WHERE x = 1.0');
  });

  it('subscriber receives SQL string for prepared UPDATE statements', (t) => {
    let calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');
    db.exec('INSERT INTO t VALUES (1)');
    calls = []; // reset after setup

    using stmt = db.prepare('UPDATE t SET x = ? WHERE x = ?');
    stmt.run(2, 1);

    assert.strictEqual(calls.length, 1);
    assert.strictEqual(calls[0].sql, 'UPDATE t SET x = 2.0 WHERE x = 1.0');
  });

  it('subscriber receives SQL string for prepared DELETE statements', (t) => {
    let calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');
    db.exec('INSERT INTO t VALUES (1)');
    calls = []; // reset after setup

    using stmt = db.prepare('DELETE FROM t WHERE x = ?');
    stmt.run(1);

    assert.strictEqual(calls.length, 1);
    assert.strictEqual(calls[0].sql, 'DELETE FROM t WHERE x = 1.0');
  });

  it('no calls received after unsubscribe', (t) => {
    const calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);

    db.exec('CREATE TABLE t (x INTEGER)');
    assert.strictEqual(calls.length, 1);

    dc.unsubscribe('sqlite.db.query', handler);
    db.exec('INSERT INTO t VALUES (1)');
    assert.strictEqual(calls.length, 1); // No new calls after unsubscribe
  });

  it('falls back to source SQL when expansion fails', (t) => {
    let calls = [];
    using db = new Database(':memory:', { limits: { length: 1000 } });

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x TEXT)');
    calls = []; // reset after setup

    using stmt = db.prepare('INSERT INTO t VALUES (?)');

    const longValue = 'a'.repeat(977);
    stmt.run(longValue);

    assert.strictEqual(calls.length, 1);
    // Falls back to source SQL with unexpanded '?' placeholder
    assert.strictEqual(calls[0].sql, 'INSERT INTO t VALUES (?)');
  });

  it('database property identifies the correct database', (t) => {
    const calls = [];
    using db1 = new Database(':memory:');
    using db2 = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db1.exec('CREATE TABLE t (x INTEGER)');
    db2.exec('CREATE TABLE t (x INTEGER)');

    assert.strictEqual(calls.length, 2);
    assert.strictEqual(calls[0].database, db1);
    assert.strictEqual(calls[1].database, db2);
    assert.notStrictEqual(calls[0].database, calls[1].database);
  });

  it('duration is a number', (t) => {
    const calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');

    assert.strictEqual(calls.length, 1);
    assert.strictEqual(typeof calls[0].duration, 'number');
  });

  it('duration is non-negative', (t) => {
    const calls = [];
    using db = new Database(':memory:');

    const handler = (msg) => calls.push(msg);
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    db.exec('CREATE TABLE t (x INTEGER)');

    assert.strictEqual(calls.length, 1);
    assert.ok(calls[0].duration >= 0);
  });

  it('does not publish when an unfinished statement is collected', async (t) => {
    let calls = 0;
    const handler = () => calls++;
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    let collected = false;
    const registry = new FinalizationRegistry(() => { collected = true; });

    (() => {
      const db = new Database(':memory:');
      db.exec('CREATE TABLE t (x INTEGER)');
      for (let i = 0; i < 10; i++) {
        db.exec(`INSERT INTO t VALUES (${i})`);
      }

      const stmt = db.prepare('SELECT x FROM t');
      registry.register(stmt);
      stmt.iterate().next(); // Leave the statement unfinished.
    })();

    calls = 0; // reset after setup
    await gcUntil('unfinished statement is collected', () => collected);

    assert.strictEqual(calls, 0);
  });

  it('subscriber cannot close the database or statement', (t) => {
    using db = new Database(':memory:');

    db.exec('CREATE TABLE t (x INTEGER)');
    using stmt = db.prepare('INSERT INTO t VALUES (?)');

    const handler = mustCall(() => {
      assert.throws(() => db.close(), { code: 'ERR_INVALID_STATE' });
      assert.throws(() => stmt.close(), { code: 'ERR_INVALID_STATE' });
      assert.throws(() => stmt[Symbol.dispose](), {
        code: 'ERR_INVALID_STATE',
      });
    });
    dc.subscribe('sqlite.db.query', handler);
    t.after(() => dc.unsubscribe('sqlite.db.query', handler));

    stmt.run(1);

    dc.unsubscribe('sqlite.db.query', handler);
    assert.deepStrictEqual(db.prepare('SELECT x FROM t').all(), [
      { __proto__: null, x: 1 },
    ]);
  });
});