/**
 * Unit tests for payment-catalog.service.js.
 *
 * Covers:
 *   - DB → app-facing shape transformation (grouping, ordering)
 *   - Active-only filter (inactive group OR method excluded; empty groups dropped)
 *   - L1 (in-process) cache hit
 *   - invalidatePaymentCatalog clears the cache
 *   - findActiveMethodByCode is casing-tolerant; returns null for missing/inactive
 *
 * We deliberately don't unit-test the Valkey layer here — that's an integration
 * concern and the real Valkey is wired up in setup.js. The in-process cache is
 * sufficient to assert that mutators correctly invalidate.
 */

import { describe, it, expect, beforeEach } from 'vitest'
import { db } from '../helpers/db.js'

const {
  getCatalogForApp,
  invalidatePaymentCatalog,
  findActiveMethodByCode,
  createGroup,
  updateGroup,
  createMethod,
  updateMethod,
} = await import('../../src/services/payment-catalog.service.js')

const sql = db()

const wipeCatalog = async () => {
  await sql`DELETE FROM payment_methods`
  await sql`DELETE FROM payment_method_groups`
  // Drop any cached state from the previous test.
  await invalidatePaymentCatalog()
}

const insertGroup = async ({ name, order = 0, active = true }) => {
  const [row] = await sql`
    INSERT INTO payment_method_groups (name, display_order, is_active)
    VALUES (${name}, ${order}, ${active})
    RETURNING id
  `
  return row.id
}

const insertMethod = async ({ groupId, code, display = null, order = 0, icon = null, active = true }) => {
  const [row] = await sql`
    INSERT INTO payment_methods (group_id, display_name, payment_code, display_order, icon, is_active)
    VALUES (${groupId}, ${display ?? code}, ${code}, ${order}, ${icon}, ${active})
    RETURNING id
  `
  return row.id
}

describe('payment-catalog.service', () => {
  beforeEach(async () => {
    await wipeCatalog()
  })

  describe('getCatalogForApp', () => {
    it('returns { groups: [] } on an empty catalog', async () => {
      const out = await getCatalogForApp()
      expect(out).toEqual({ groups: [] })
    })

    it('groups methods under their group and orders both correctly', async () => {
      const gWallet = await insertGroup({ name: 'E-Wallet', order: 1 })
      const gFast = await insertGroup({ name: 'Paling Cepat', order: 0 })

      await insertMethod({ groupId: gWallet, code: 'DANA', order: 1 })
      await insertMethod({ groupId: gWallet, code: 'OVO', order: 0 })
      await insertMethod({ groupId: gFast, code: 'QRIS', order: 0 })

      await invalidatePaymentCatalog() // ensure no stale L1 from previous reads
      const { groups } = await getCatalogForApp()

      expect(groups.map((g) => g.name)).toEqual(['Paling Cepat', 'E-Wallet'])
      expect(groups[0].methods.map((m) => m.payment_code)).toEqual(['QRIS'])
      expect(groups[1].methods.map((m) => m.payment_code)).toEqual(['OVO', 'DANA'])
    })

    it('drops inactive methods', async () => {
      const g = await insertGroup({ name: 'E-Wallet' })
      await insertMethod({ groupId: g, code: 'OVO', active: true })
      await insertMethod({ groupId: g, code: 'GOPAY', active: false })

      await invalidatePaymentCatalog()
      const { groups } = await getCatalogForApp()

      expect(groups).toHaveLength(1)
      expect(groups[0].methods.map((m) => m.payment_code)).toEqual(['OVO'])
    })

    it('drops inactive groups (and their methods, even if active)', async () => {
      const gActive = await insertGroup({ name: 'E-Wallet', order: 0, active: true })
      const gHidden = await insertGroup({ name: 'Hidden', order: 1, active: false })
      await insertMethod({ groupId: gActive, code: 'OVO' })
      await insertMethod({ groupId: gHidden, code: 'X1' })

      await invalidatePaymentCatalog()
      const { groups } = await getCatalogForApp()

      expect(groups.map((g) => g.name)).toEqual(['E-Wallet'])
    })

    it('drops groups with no active methods', async () => {
      const gEmpty = await insertGroup({ name: 'Empty', order: 0 })
      const gFull = await insertGroup({ name: 'E-Wallet', order: 1 })
      await insertMethod({ groupId: gEmpty, code: 'GHOST', active: false })
      await insertMethod({ groupId: gFull, code: 'OVO' })

      await invalidatePaymentCatalog()
      const { groups } = await getCatalogForApp()

      expect(groups.map((g) => g.name)).toEqual(['E-Wallet'])
    })

    it('caches in-process (second call returns the same object reference)', async () => {
      const g = await insertGroup({ name: 'E-Wallet' })
      await insertMethod({ groupId: g, code: 'OVO' })

      await invalidatePaymentCatalog()
      const a = await getCatalogForApp()
      const b = await getCatalogForApp()
      expect(b).toBe(a) // same object identity = served from L1
    })

    it('a mutator invalidates the cache', async () => {
      const g = await insertGroup({ name: 'E-Wallet' })
      await insertMethod({ groupId: g, code: 'OVO' })

      await invalidatePaymentCatalog()
      const first = await getCatalogForApp()
      expect(first.groups[0].methods).toHaveLength(1)

      // Add a new method via the service mutator.
      await createMethod({ groupId: g, displayName: 'DANA', paymentCode: 'DANA' })

      const second = await getCatalogForApp()
      expect(second).not.toBe(first) // L1 was cleared, fresh read
      expect(second.groups[0].methods).toHaveLength(2)
    })
  })

  describe('findActiveMethodByCode', () => {
    beforeEach(async () => {
      const g = await insertGroup({ name: 'E-Wallet' })
      await insertMethod({ groupId: g, code: 'OVO' })
      await insertMethod({ groupId: g, code: 'GOPAY', active: false })
      await invalidatePaymentCatalog()
    })

    it('matches by exact code', async () => {
      const m = await findActiveMethodByCode('OVO')
      expect(m?.payment_code).toBe('OVO')
    })

    it('is casing-tolerant (lower-case incoming)', async () => {
      const m = await findActiveMethodByCode('ovo')
      expect(m?.payment_code).toBe('OVO')
    })

    it('returns null for an inactive code', async () => {
      const m = await findActiveMethodByCode('GOPAY')
      expect(m).toBeNull()
    })

    it('returns null for an unknown code', async () => {
      const m = await findActiveMethodByCode('UNKNOWN_CODE')
      expect(m).toBeNull()
    })

    it('returns null for empty / undefined input', async () => {
      expect(await findActiveMethodByCode('')).toBeNull()
      expect(await findActiveMethodByCode(undefined)).toBeNull()
      expect(await findActiveMethodByCode(null)).toBeNull()
    })
  })

  describe('mutator side effects', () => {
    it('createGroup persists + uppercases nothing (group names are free-form)', async () => {
      const row = await createGroup({ name: 'Cards', displayOrder: 5 })
      expect(row.name).toBe('Cards')
      expect(row.display_order).toBe(5)
      expect(row.is_active).toBe(true)
    })

    it('createMethod uppercases payment_code', async () => {
      const g = await createGroup({ name: 'Cards' })
      const m = await createMethod({
        groupId: g.id,
        displayName: 'Visa',
        paymentCode: 'visa', // lowercase incoming
      })
      expect(m.payment_code).toBe('VISA')
    })

    it('updateMethod also uppercases payment_code when patched', async () => {
      const g = await createGroup({ name: 'Cards' })
      const m = await createMethod({ groupId: g.id, displayName: 'Visa', paymentCode: 'VISA' })
      const updated = await updateMethod(m.id, { paymentCode: 'mastercard' })
      expect(updated.payment_code).toBe('MASTERCARD')
    })

    it('updateGroup applies COALESCE patches (omitted fields preserved)', async () => {
      const g = await createGroup({ name: 'Cards', displayOrder: 1 })
      const out = await updateGroup(g.id, { name: 'Credit Cards' })
      expect(out.name).toBe('Credit Cards')
      expect(out.display_order).toBe(1) // unchanged
    })
  })
})