import { describe, it, expect } from 'vitest';
import Database from 'better-sqlite3';
import { runMigrations } from '@main/db/migrations/index.js';
import { ContinuityService } from '@main/services/ContinuityService.js';

function dbWithDates(isoDates: string[]): Database.Database {
  const db = new Database(':memory:');
  runMigrations(db);
  const insert = db.prepare(
    `INSERT INTO notes (id, raw_text, ai_status, created_at, updated_at)
     VALUES (?, ?, 'pending', ?, ?)`
  );
  for (const [i, d] of isoDates.entries()) insert.run(`n${i}`, 'x', d, d);
  return db;
}

describe('ContinuityService', () => {
  it('empty db returns zero counts and no recovery toast', () => {
    const db = new Database(':memory:');
    runMigrations(db);
    const svc = new ContinuityService(db, () => new Date('2026-04-25T10:00:00+09:00'));
    const r = svc.get();
    expect(r.weekCount).toBe(0);
    expect(r.weekTarget).toBe(7);
    expect(r.consecutiveCompleteWeeks).toBe(0);
    expect(r.showRecoveryToast).toBe(false);
    expect(r.lastNoteAt).toBeNull();
  });

  it('counts notes in current KST week (월~일)', () => {
    const db = dbWithDates([
      '2026-04-20T01:00:00+09:00',
      '2026-04-22T03:00:00+09:00',
      '2026-04-25T22:00:00+09:00'
    ]);
    const svc = new ContinuityService(db, () => new Date('2026-04-25T23:00:00+09:00'));
    const r = svc.get();
    expect(r.weekStart).toBe('2026-04-20');
    expect(r.weekCount).toBe(3);
  });

  function isoKst(year: number, month: number, day: number, hour = 10): string {
    const mm = String(month).padStart(2, '0');
    const dd = String(day).padStart(2, '0');
    const hh = String(hour).padStart(2, '0');
    return `${year}-${mm}-${dd}T${hh}:00:00+09:00`;
  }

  it('consecutiveCompleteWeeks counts weeks with >=7 notes ending immediately before current week', () => {
    const dates: string[] = [];
    for (let d = 6; d <= 12; d++) dates.push(isoKst(2026, 4, d));
    for (let d = 13; d <= 19; d++) dates.push(isoKst(2026, 4, d));
    dates.push(isoKst(2026, 4, 20));
    dates.push(isoKst(2026, 4, 21));
    const db = dbWithDates(dates);
    const svc = new ContinuityService(db, () => new Date('2026-04-25T12:00:00+09:00'));
    const r = svc.get();
    expect(r.consecutiveCompleteWeeks).toBe(2);
    expect(r.weekCount).toBe(2);
  });

  it('consecutiveCompleteWeeks includes current week if it already hit 7', () => {
    const dates: string[] = [];
    for (let d = 13; d <= 19; d++) dates.push(isoKst(2026, 4, d));
    for (let d = 20; d <= 26; d++) dates.push(isoKst(2026, 4, d));
    const db = dbWithDates(dates);
    const svc = new ContinuityService(db, () => new Date('2026-04-26T23:00:00+09:00'));
    const r = svc.get();
    expect(r.weekCount).toBe(7);
    expect(r.consecutiveCompleteWeeks).toBe(2);
  });

  it('showRecoveryToast=true when last note is >=7 days ago AND a fresh note exists today', () => {
    const dates = [
      '2026-04-15T10:00:00+09:00',
      '2026-04-25T11:00:00+09:00'
    ];
    const db = dbWithDates(dates);
    const svc = new ContinuityService(db, () => new Date('2026-04-25T12:00:00+09:00'));
    expect(svc.get().showRecoveryToast).toBe(true);
  });

  it('showRecoveryToast=false when there are notes within last 7 days', () => {
    const db = dbWithDates([
      '2026-04-22T10:00:00+09:00',
      '2026-04-25T11:00:00+09:00'
    ]);
    const svc = new ContinuityService(db, () => new Date('2026-04-25T12:00:00+09:00'));
    expect(svc.get().showRecoveryToast).toBe(false);
  });

  it('excludes trashed notes from streak/recovery math (v0.2.3 #4)', () => {
    const db = dbWithDates([
      '2026-04-22T10:00:00+09:00',
      '2026-04-25T11:00:00+09:00'
    ]);
    // 22일 노트를 trash → 25일이 마지막. 22일 미만이라 weekCount 1 이지만 lastNoteAt
    // 은 25일 (마지막 active) 이어야 함. trashed 노트가 무시되어야 함.
    db.prepare(`UPDATE notes SET deleted_at='2026-04-26T00:00:00Z' WHERE id='n0'`).run();
    const svc = new ContinuityService(db, () => new Date('2026-04-25T12:00:00+09:00'));
    const r = svc.get();
    expect(r.weekCount).toBe(1);
    expect(r.lastNoteAt).toBe('2026-04-25T02:00:00.000Z'); // KST 11:00 = UTC 02:00
  });
});