import { describe, expect, it } from 'vitest';
import { openDb } from './index';
import { runMigrations } from './migrate';
import { makeDb, seedFixture } from '../testing/helpers';

const throwsConstraint = (fn: () => unknown) => expect(fn).toThrow(/CHECK|UNIQUE|FOREIGN KEY|constraint/i);

describe('migrations', () => {
  it('apply once and are then a no-op', () => {
    const db = openDb(':memory:');
    expect(runMigrations(db)).toEqual(['001_init.sql']);
    expect(runMigrations(db)).toEqual([]);
  });
});

describe('schema rules', () => {
  const orderFor = (db: ReturnType<typeof makeDb>) => {
    const f = seedFixture(db);
    const id = Number(
      db
        .prepare(
          `INSERT INTO orders (shop_id, draw_date, source, created_by_user_id, raw_text)
           VALUES (?, '2026-11-03', 'whatsapp_text', ?, '0888')`,
        )
        .run(f.shops.a, f.admin.id).lastInsertRowid,
    );
    return { f, orderId: id };
  };

  it('accepts a normal order line, including leading zeros', () => {
    const db = makeDb();
    const { orderId } = orderFor(db);
    db.prepare('INSERT INTO order_lines (order_id, ending, qty) VALUES (?, ?, ?)').run(orderId, '0057', 2);
    const row = db.prepare('SELECT ending, qty FROM order_lines').get() as { ending: string; qty: number };
    expect(row).toEqual({ ending: '0057', qty: 2 });
  });

  it('rejects an ending that is not exactly 4 digits', () => {
    const db = makeDb();
    const { orderId } = orderFor(db);
    const add = (ending: string) => () =>
      db.prepare('INSERT INTO order_lines (order_id, ending, qty) VALUES (?, ?, 1)').run(orderId, ending);
    throwsConstraint(add('888'));
    throwsConstraint(add('08888'));
    throwsConstraint(add('08a8'));
  });

  it('rejects a quantity of zero or less', () => {
    const db = makeDb();
    const { orderId } = orderFor(db);
    const add = (qty: number) => () =>
      db.prepare('INSERT INTO order_lines (order_id, ending, qty) VALUES (?, ?, ?)').run(orderId, '0888', qty);
    throwsConstraint(add(0));
    throwsConstraint(add(-1));
  });

  it('requires a well-formed draw date on every order', () => {
    const db = makeDb();
    const f = seedFixture(db);
    const add = (date: string | null) => () =>
      db
        .prepare("INSERT INTO orders (shop_id, draw_date, source, created_by_user_id, raw_text) VALUES (?, ?, 'web', ?, '0888')")
        .run(f.shops.a, date, f.admin.id);
    expect(add('2026-11-03')).not.toThrow();
    throwsConstraint(add(null));
    throwsConstraint(add('3/11/2026'));
  });

  it('only allows prize tiers 4 to 9', () => {
    const db = makeDb();
    const draw = Number(
      db.prepare("INSERT INTO draws (draw_date, scheme, draw_code) VALUES ('2026-11-03', 'TEST', 'TS-1')").run().lastInsertRowid,
    );
    const add = (tier: number) => () =>
      db.prepare('INSERT INTO prizes (draw_id, tier, amount, ending) VALUES (?, ?, 100, ?)').run(draw, tier, '1234');
    expect(add(4)).not.toThrow();
    throwsConstraint(add(3));
    throwsConstraint(add(10));
  });

  it('keeps phone numbers unique but allows several users without one', () => {
    const db = makeDb();
    const f = seedFixture(db);
    const add = (username: string, phone: string | null) => () =>
      db
        .prepare('INSERT INTO users (username, password_hash, phone) VALUES (?, ?, ?)')
        .run(username, 'x', phone);
    throwsConstraint(add('dup', f.admin.phone));
    expect(add('nophone1', null)).not.toThrow();
    expect(add('nophone2', null)).not.toThrow();
  });

  it('refuses a phone number that is not digits of a sensible length', () => {
    const db = makeDb();
    const add = (phone: string) => () =>
      db.prepare('INSERT INTO users (username, password_hash, phone) VALUES (?, ?, ?)').run('u' + phone, 'x', phone);
    throwsConstraint(add('+919847049032'));
    throwsConstraint(add('98470 49032'));
    throwsConstraint(add('1234567')); // too short
    expect(add('919847049032')).not.toThrow();
  });

  it('keeps usernames unique', () => {
    const db = makeDb();
    seedFixture(db);
    const add = () => db.prepare("INSERT INTO users (username, password_hash) VALUES ('admin', 'x')").run();
    throwsConstraint(add);
  });

  it('refuses a duplicate WhatsApp message id', () => {
    const db = makeDb();
    const add = () =>
      db.prepare("INSERT INTO ingest_log (wa_message_id, kind, outcome) VALUES ('M1', 'text', 'accepted')").run();
    expect(add).not.toThrow();
    throwsConstraint(add);
  });

  it('deletes an order\'s lines together with the order', () => {
    const db = makeDb();
    const { orderId } = orderFor(db);
    db.prepare('INSERT INTO order_lines (order_id, ending, qty) VALUES (?, ?, 1)').run(orderId, '0888');
    db.prepare('DELETE FROM orders WHERE id = ?').run(orderId);
    expect(db.prepare('SELECT COUNT(*) AS n FROM order_lines').get()).toEqual({ n: 0 });
  });
});