import { describe, it, expect } from 'vitest'
import { openDb } from '../src/db'
import { reminderEmail } from '../src/reminder-templates'
import {
  upsertReminder, listQueue, dismissReminder, setReminderStatus, getReminder,
  getNumberSetting, setSetting,
} from '../src/repos-reminders'

describe('reminder templates', () => {
  it('renders an overdue dunning email with the amount and a polite tone', () => {
    const mail = reminderEmail('invoice_overdue', {
      clientName: 'Malabar Stores', companyName: 'Tecnostac',
      docNo: 'INV/26-27-0007', amountPaise: 11_800_00, daysOverdue: 12,
    })
    expect(mail.subject).toContain('INV/26-27-0007')
    expect(mail.bodyText).toContain('₹11,800.00')
    expect(mail.bodyText).toContain('12 day')
  })
})

describe('reminder repo', () => {
  it('is idempotent on (rule_kind, subject_id, due_period)', () => {
    const db = openDb(':memory:')
    const a = upsertReminder(db, { ruleKind: 'invoice_overdue', subjectId: 'inv1', duePeriod: '2026-07', clientId: 'c1', docId: 'inv1', now: '2026-07-10T00:00:00Z' })
    expect(a.created).toBe(true)
    const b = upsertReminder(db, { ruleKind: 'invoice_overdue', subjectId: 'inv1', duePeriod: '2026-07', clientId: 'c1', docId: 'inv1', now: '2026-07-10T06:00:00Z' })
    expect(b.created).toBe(false)
    expect(b.id).toBe(a.id) // same row returned, not a duplicate
    expect(listQueue(db)).toHaveLength(1)
    expect(db.prepare(`SELECT COUNT(*) AS n FROM audit_log WHERE entity='reminder'`).get()).toMatchObject({ n: 1 })
  })
  it('transitions and dismisses, refusing to dismiss a sent reminder', () => {
    const db = openDb(':memory:')
    const { id } = upsertReminder(db, { ruleKind: 'follow_up', subjectId: 'i1', duePeriod: '2026-07-08', clientId: 'c1', now: '2026-07-10T00:00:00Z' })
    const dismissed = dismissReminder(db, 'u1', id)
    expect(dismissed.status).toBe('dismissed')
    const { id: id2 } = upsertReminder(db, { ruleKind: 'invoice_overdue', subjectId: 'inv2', duePeriod: '2026-07', clientId: 'c1', docId: 'inv2', now: '2026-07-10T00:00:00Z' })
    setReminderStatus(db, 'u1', id2, 'sent', { sentAt: '2026-07-10T09:00:00Z' })
    expect(getReminder(db, id2)!.status).toBe('sent')
    expect(() => dismissReminder(db, 'u1', id2)).toThrow(/sent/i)
  })
  it('reads number settings with a fallback', () => {
    const db = openDb(':memory:')
    expect(getNumberSetting(db, 'reminders.overdue_days', 7)).toBe(7)
    setSetting(db, 'u1', 'reminders.overdue_days', '10')
    expect(getNumberSetting(db, 'reminders.overdue_days', 7)).toBe(10)
  })
})