import { beforeEach, describe, expect, it, vi } from 'vitest'
import { createTestPinia } from '../helpers/app'
import { useI18nStore } from '@/stores/i18n'
import { BUILTIN_MESSAGES } from '@/i18n/builtin-messages'

const loadDataApi = vi.fn()

vi.mock('@/services/api', () => ({
  loadDataApi: (...args) => loadDataApi(...args),
}))

/** 按 s_i18n 行结构构造返回值 */
function rows(locale, entries) {
  return {
    data: entries.map(([b_key, b_value]) => ({ b_key, b_locale: locale, b_value, b_canuse: 1 })),
  }
}

beforeEach(() => {
  loadDataApi.mockReset()
  createTestPinia()
  const i18n = useI18nStore()
  i18n.setLocale('zh-CN')
  i18n.clearMessages()
})

describe('i18n store · 译文加载（s_i18n）', () => {
  it('加载当前语言译文并写入运行时（t 生效）', async () => {
    loadDataApi.mockResolvedValue(rows('zh-CN', [['field.x.b_name', '客户名称']]))
    const i18n = useI18nStore()

    await i18n.loadMessages()

    expect(loadDataApi).toHaveBeenCalledTimes(1)
    const [viewName, condition] = loadDataApi.mock.calls[0]
    expect(viewName).toBe('s_i18n')
    expect(condition).toContain("b_locale = N'zh-CN'")
    expect(condition).toContain('b_canuse = 1')
    expect(i18n.t('field.x.b_name', '名称')).toBe('客户名称')
  })

  it('英文模式：内置 UI 文案兜底，库表译文覆盖同名 key', async () => {
    loadDataApi.mockResolvedValue(rows('en-US', [['common.cancel', 'Cancel!!']]))
    const i18n = useI18nStore()
    i18n.setLocale('en-US')

    await i18n.loadMessages()

    // 库里有的以库为准
    expect(i18n.t('common.cancel', '取消')).toBe('Cancel!!')
    // 库里没有的走前端内置英文
    expect(i18n.t('common.applyQuery', '应用')).toBe(BUILTIN_MESSAGES['en-US']['common.applyQuery'])
    expect(i18n.t('common.applyQuery', '应用')).toBe('Apply')
  })

  it('切换语言后重新加载，且缓存命中不再发请求', async () => {
    loadDataApi.mockResolvedValue(rows('zh-CN', [['k', '中文']]))
    const i18n = useI18nStore()
    await i18n.loadMessages()
    expect(loadDataApi).toHaveBeenCalledTimes(1)

    // 切到英文：新语言未缓存 → 发请求
    loadDataApi.mockResolvedValue(rows('en-US', [['k', 'EN']]))
    i18n.setLocale('en-US')
    await i18n.loadMessages('en-US')
    expect(loadDataApi).toHaveBeenCalledTimes(2)
    expect(i18n.t('k', 'x')).toBe('EN')

    // 切回中文：命中缓存 → 不再请求，但译文要切回来
    i18n.setLocale('zh-CN')
    await i18n.loadMessages()
    expect(loadDataApi).toHaveBeenCalledTimes(2)
    expect(i18n.t('k', 'x')).toBe('中文')
  })

  it('并发同语言只发一个请求', async () => {
    loadDataApi.mockResolvedValue(rows('zh-CN', [['k', 'v']]))
    const i18n = useI18nStore()
    await Promise.all([i18n.loadMessages(), i18n.loadMessages(), i18n.loadMessages()])
    expect(loadDataApi).toHaveBeenCalledTimes(1)
  })

  it('接口失败不抛出，界面回落兜底文案', async () => {
    loadDataApi.mockRejectedValue(new Error('boom'))
    const i18n = useI18nStore()
    await expect(i18n.loadMessages()).resolves.toEqual({})
    expect(i18n.t('common.cancel', '取消')).toBe('取消')
    expect(i18n.error).toBe('boom')
  })

  it('b_locale 走转义，单引号不会拼坏 SQL', async () => {
    loadDataApi.mockResolvedValue({ data: [] })
    const i18n = useI18nStore()
    await i18n.loadMessages("zh'; drop table s_i18n --")
    expect(loadDataApi.mock.calls[0][1]).toContain("N'zh''; drop table s_i18n --'")
  })

  it('请求回来时语言已被切走则不覆盖当前译文', async () => {
    let resolveQuery
    loadDataApi.mockReturnValue(new Promise((r) => (resolveQuery = r)))
    const i18n = useI18nStore()
    const pending = i18n.loadMessages()
    i18n.setLocale('en-US')
    resolveQuery({ data: [{ b_key: 'k', b_value: '中文值' }] })
    await pending
    // 当前是英文，中文译文不应写进运行时（英文下 k 无译文 → 回落 fallback）
    expect(i18n.t('k', 'fallback')).toBe('fallback')
  })
})