import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
import { registerEndpoint } from '@nuxt/test-utils/runtime'
import { readBody } from 'h3'
import { initLogger, logError, logWarn, logInfo, logDebug } from '../../app/utils/logger.js'

const wait = (ms = 10) => new Promise(resolve => setTimeout(resolve, ms))

describe('app/utils/logger', () => {
  const consoleMocks = {}
  const originalConsole = {}
  const testState = {
    serverCalls: [],
  }

  beforeEach(() => {
    testState.serverCalls = []
    const calls = { log: [], error: [], warn: [], debug: [] }

    Object.keys(calls).forEach((key) => {
      originalConsole[key] = console[key]
      consoleMocks[key] = vi.fn((...args) => calls[key].push(args))
      console[key] = consoleMocks[key]
    })

    registerEndpoint('/api/log', async (event) => {
      const body = event.body || (await readBody(event).catch(() => ({})))
      testState.serverCalls.push(body)
      return { ok: true }
    }, { method: 'POST' })
  })

  afterEach(() => {
    Object.keys(originalConsole).forEach((key) => {
      console[key] = originalConsole[key]
    })
    vi.restoreAllMocks()
  })

  describe('initLogger', () => {
    it('sets sessionId and userId for server calls', async () => {
      initLogger('session-123', 'user-456')
      logError('Test message')
      await wait()

      expect(testState.serverCalls[0]).toMatchObject({
        sessionId: 'session-123',
        userId: 'user-456',
      })
    })
  })

  describe('log functions', () => {
    it.each([
      ['logError', logError, 'error', 'error'],
      ['logWarn', logWarn, 'warn', 'warn'],
      ['logInfo', logInfo, 'info', 'log'],
      ['logDebug', logDebug, 'debug', 'log'],
    ])('%s logs to console and sends to server', async (name, logFn, level, consoleKey) => {
      initLogger('session-123', 'user-456')
      logFn('Test message', { key: 'value' })
      await wait()

      expect(consoleMocks[consoleKey]).toHaveBeenCalledWith(`[Test message]`, { key: 'value' })
      expect(testState.serverCalls[0]).toMatchObject({
        level,
        message: 'Test message',
        data: { key: 'value' },
      })
    })

    it('handles server fetch failure gracefully', async () => {
      registerEndpoint('/api/log', () => {
        throw new Error('Network error')
      }, { method: 'POST' })

      initLogger('session-123', 'user-456')
      expect(() => logError('Test error')).not.toThrow()
      await wait()
      expect(consoleMocks.error).toHaveBeenCalled()
    })
  })

  describe('sendToServer', () => {
    it('includes timestamp in server request', async () => {
      initLogger('session-123', 'user-456')
      logError('Test message')
      await wait()

      expect(testState.serverCalls[0].timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/)
    })

    it('handles null sessionId and userId', async () => {
      initLogger(null, null)
      logError('Test message')
      await wait()

      const { sessionId, userId } = testState.serverCalls[0]
      expect(sessionId === null || sessionId === undefined).toBe(true)
      expect(userId === null || userId === undefined).toBe(true)
    })
  })
})
