/**
 * v0.8.0 回归套件：SQL 三值逻辑（NULL 语义）—— PB-2
 * ============================================================================
 * 本套件锁定 PLAN-v0.7.5.md 根因 7（"未解析/UNKNOWN 静默变 false"）与
 * 附录 §5 缺陷 A15 的修复契约，并对**四种存储引擎**逐一验证同一语义。
 *
 * 历史缺陷（本套件即为其反例）：
 *   1. `WHERE n = NULL` 命中 NULL 行（`===` 比较 null === null）；
 *   2. `WHERE n != NULL` 返回所有非 NULL 行；
 *   3. `WHERE n NOT BETWEEN 1 AND 2` 恒空集 —— parser 生成的字段级
 *      `{ n: { $or: [ { $lt: 1 }, { $gt: 2 } ] } }` 被求值成"查询字段 `$lt`"，
 *      每行都是 UNKNOWN；根因是字段级 `$or` 递归进了 where 子句级求值器。
 *
 * 参考数据：
 *   id=1  n=1     s='x'
 *   id=2  n=2     s=NULL
 *   id=3  n=NULL  s='x'
 *   id=4  n=3     s='y'
 */
import { MetonaSqlark } from '../src/core';
import type { DatabaseConfig } from '../src/constants';
import { rows as rowsOf } from './helpers/assertions';

interface EngineCase {
  label: string;
  mode: DatabaseConfig['mode'];
  extra?: Partial<DatabaseConfig>;
}

const ENGINES: EngineCase[] = [
  { label: 'memory', mode: 'memory' },
  { label: 'disk', mode: 'disk' },
  { label: 'hybrid', mode: 'hybrid' },
  { label: 'aria', mode: 'aria', extra: { diskEngine: 'memory' } },
];

/** [SQL, 期望 id 集合] */
const MATRIX: Array<[sql: string, expected: string[]]> = [
  // --- 与 NULL 的比较：结果 UNKNOWN，WHERE 不保留 ---
  ['SELECT id FROM t WHERE n = NULL', []],
  ['SELECT id FROM t WHERE n != NULL', []],
  ['SELECT id FROM t WHERE n <> NULL', []],

  // --- IS NULL / IS NOT NULL 是谓词，不走比较 ---
  ['SELECT id FROM t WHERE n IS NULL', ['3']],
  ['SELECT id FROM t WHERE n IS NOT NULL', ['1', '2', '4']],
  ["SELECT id FROM t WHERE s IS NULL", ['2']],

  // --- IN / NOT IN：列表含 NULL 且未命中 → UNKNOWN ---
  ['SELECT id FROM t WHERE n IN (1, NULL)', ['1']],
  ['SELECT id FROM t WHERE n NOT IN (1, 2)', ['4']],
  ["SELECT id FROM t WHERE s NOT IN ('x')", ['4']],
  ['SELECT id FROM t WHERE n IN (1, 2)', ['1', '2']],

  // --- LIKE / NOT LIKE：NULL 操作数 → UNKNOWN ---
  ["SELECT id FROM t WHERE s LIKE 'x'", ['1', '3']],
  ["SELECT id FROM t WHERE s NOT LIKE 'x'", ['4']],

  // --- NOT：UNKNOWN 取反仍是 UNKNOWN ---
  ['SELECT id FROM t WHERE NOT (n = 1)', ['2', '4']],
  ['SELECT id FROM t WHERE NOT (n = 4)', ['1', '2', '4']],

  // --- BETWEEN / NOT BETWEEN（本套件的核心回归点）---
  ['SELECT id FROM t WHERE n BETWEEN 1 AND 2', ['1', '2']],
  ['SELECT id FROM t WHERE n NOT BETWEEN 1 AND 2', ['4']],
  ['SELECT id FROM t WHERE s BETWEEN \'a\' AND \'z\'', ['1', '3', '4']],
  ["SELECT id FROM t WHERE s NOT BETWEEN 'a' AND 'z'", []],

  // --- 字段级 $or / $not 与 where 级逻辑组合的一致性 ---
  ['SELECT id FROM t WHERE n > 1 OR n < 0', ['2', '4']],
  ['SELECT id FROM t WHERE n > 0 AND n < 3', ['1', '2']],
  ["SELECT id FROM t WHERE s = 'x' OR n IS NULL", ['1', '3']],
  ["SELECT id FROM t WHERE s = 'x' AND n IS NULL", ['3']],
  ["SELECT id FROM t WHERE s != 'x'", ['4']],

  // --- 裸列作为布尔条件（字段存在性）不应因 NULL 崩溃 ---
  ['SELECT id FROM t WHERE n >= 3', ['4']],
  ['SELECT id FROM t WHERE n <= 1', ['1']],
];

describe('v0.8.0 SQL 三值逻辑（PB-2 / A15）', () => {
  for (const engine of ENGINES) {
    describe(`${engine.label} 引擎`, () => {
      let db: MetonaSqlark;

      beforeAll(async () => {
        db = await MetonaSqlark.create({
          name: `sql-three-valued-${engine.label}`,
          mode: engine.mode,
          ...(engine.extra ?? {}),
        });
        await db.defineTable('t', {
          id: { type: 'string', primaryKey: true },
          n: { type: 'number' },
          s: { type: 'string' },
        });
        await db.query(
          "INSERT INTO t (id, n, s) VALUES ('1', 1, 'x'), ('2', 2, NULL), ('3', NULL, 'x'), ('4', 3, 'y')",
        );
      });

      afterAll(async () => {
        await db.close();
      });

      it.each(MATRIX)('%s → %j', async (sql, expected) => {
        const rows = rowsOf<Record<string, unknown>>(await db.query(sql));
        const got = rows.map((row) => row.id as string).sort();
        expect(got).toEqual([...expected].sort());
      });

      it('UPDATE / DELETE 使用同一套三值语义', async () => {
        // 独立表，避免污染上面的只读矩阵
        await db.defineTable('u', {
          id: { type: 'string', primaryKey: true },
          n: { type: 'number' },
        });
        await db.query("INSERT INTO u (id, n) VALUES ('a', 1), ('b', NULL), ('c', 3)");

        // `n > 1` 只命中 c（NULL → UNKNOWN）
        await db.query("UPDATE u SET n = 9 WHERE n > 1");
        const afterUpdate = rowsOf<Record<string, unknown>>(await db.query('SELECT id, n FROM u ORDER BY id'));
        expect(afterUpdate.map((r) => [r.id, r.n])).toEqual([
          ['a', 1],
          ['b', null],
          ['c', 9],
        ]);

        // `n = NULL` 匹配 0 行（不能把 NULL 行删掉）
        await db.query('DELETE FROM u WHERE n = NULL');
        expect(rowsOf(await db.query('SELECT id FROM u ORDER BY id'))).toHaveLength(3);

        // `n IS NULL` 命中 b
        await db.query('DELETE FROM u WHERE n IS NULL');
        const survivors = rowsOf<Record<string, unknown>>(await db.query('SELECT id FROM u ORDER BY id'));
        expect(survivors.map((r) => r.id)).toEqual(['a', 'c']);
      });
    });
  }
});