// Seam tests for the API-layer logger. Pins:
//   - level gating at the default `info` level (info+ fires, debug doesn't)
//   - the `[ts] [LEVEL] [namespace]` prefix shape, with payload args
//     passed through verbatim as additional console.* arguments
//   - that child(ns) returns an independent logger with the right namespace
//
// VITE_LOG_LEVEL is intentionally NOT stubbed — the production default
// (info) is the level this test pins. Other levels are the user's config
// concern, not the contract.
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
import logger, { child } from '@/api/logger.js'

beforeEach(() => {
  vi.spyOn(console, 'debug').mockImplementation(() => {})
  vi.spyOn(console, 'info').mockImplementation(() => {})
  vi.spyOn(console, 'warn').mockImplementation(() => {})
  vi.spyOn(console, 'error').mockImplementation(() => {})
})

afterEach(() => {
  vi.restoreAllMocks()
})

describe('root logger (default level: info)', () => {
  it('emits info/warn/error and suppresses debug', () => {
    logger.debug('d')
    logger.info('i')
    logger.warn('w')
    logger.error('e')

    expect(console.debug).not.toHaveBeenCalled()
    expect(console.info).toHaveBeenCalledTimes(1)
    expect(console.warn).toHaveBeenCalledTimes(1)
    expect(console.error).toHaveBeenCalledTimes(1)
  })

  it('prefixes the first arg with [ts] [LEVEL] [namespace]; payload is a separate arg', () => {
    logger.info('hi')
    const call = console.info.mock.calls[0]
    expect(call[0]).toMatch(/^\[\d{2}:\d{2}:\d{2}\.\d{3}\] \[INFO\] \[api\]$/)
    expect(call[1]).toBe('hi')
  })

  it('passes multiple payload args through verbatim', () => {
    logger.info('Loaded', { count: 5 }, [1, 2])
    expect(console.info).toHaveBeenCalledWith(
      expect.stringMatching(/^\[.*\] \[INFO\] \[api\]$/),
      'Loaded',
      { count: 5 },
      [1, 2],
    )
  })
})

describe('child(ns)', () => {
  it("returns a logger whose prefix namespace is the supplied ns", () => {
    const log = child('studentService')
    log.warn('hello')
    expect(console.warn).toHaveBeenCalledTimes(1)
    const call = console.warn.mock.calls[0]
    expect(call[0]).toMatch(/^\[.*\] \[WARN\] \[studentService\]$/)
    expect(call[1]).toBe('hello')
  })

  it('child and root loggers keep their namespaces independent', () => {
    const log = child('taskService')
    log.info('a')
    logger.info('b')
    expect(console.info.mock.calls[0][0]).toMatch(/\[taskService\]$/)
    expect(console.info.mock.calls[1][0]).toMatch(/\[api\]$/)
  })
})