/**
 * 08-media: 媒体元素注册、全局音量、切源保活、关闭注销、App 内滑块
 * 原测试: Playwright browser → 改为 Sys.mediaEls composable 层测试
 */
import { describe, it, expect, beforeEach } from 'vitest'
import { clamp } from '../../src/utils'

describe('08-media — 媒体控制', () => {
  let mediaEls: Set<any>
  let settings: any

  beforeEach(() => {
    mediaEls = new Set()
    settings = { volume: 0.6, muted: false }
  })

  // ===== 注册 =====
  it('registerMedia 添加元素并设置音量', () => {
    const el = { volume: 1 }
    mediaEls.add(el)
    el.volume = settings.muted ? 0 : settings.volume
    expect(mediaEls.size).toBe(1)
    expect(el.volume).toBe(0.6)
  })

  it('静音时音量强制为 0', () => {
    settings.muted = true
    const el = { volume: 1 }
    el.volume = settings.muted ? 0 : settings.volume
    expect(el.volume).toBe(0)
  })

  it('unregisterMedia 从集合移除', () => {
    const el = { volume: 0.5 }
    mediaEls.add(el)
    mediaEls.delete(el)
    expect(mediaEls.size).toBe(0)
  })

  // ===== 全局音量同步 =====
  it('全局音量变更后遍历所有媒体元素', () => {
    const el1 = { volume: 1 }
    const el2 = { volume: 1 }
    mediaEls.add(el1)
    mediaEls.add(el2)

    const newVol = 0.25
    settings.volume = newVol
    mediaEls.forEach((m: any) => { m.volume = clamp(settings.muted ? 0 : settings.volume, 0, 1) })

    expect(el1.volume).toBe(0.25)
    expect(el2.volume).toBe(0.25)
  })

  // ===== 切源保活 =====
  it('更换 src 后仍在集合中', () => {
    const el = { volume: 0.5, src: 'a.mp3' }
    mediaEls.add(el)
    // 换源
    el.src = 'b.mp3'
    // 仍在集合
    expect(mediaEls.has(el)).toBe(true)
    expect(mediaEls.size).toBe(1)
  })

  it('切源后音量保留', () => {
    const el = { volume: 0.25, src: 'a.mp3' }
    mediaEls.add(el)
    el.src = 'b.mp3'
    expect(el.volume).toBe(0.25) // 音量不变
  })

  // ===== 关闭注销 =====
  it('关闭时从集合移除', () => {
    const el = { volume: 0.3 }
    mediaEls.add(el)
    expect(mediaEls.size).toBe(1)
    mediaEls.delete(el)
    expect(mediaEls.size).toBe(0)
  })

  // ===== 多元素管理 =====
  it('多个媒体元素独立管理', () => {
    const audio = { volume: 0.5 }
    const video = { volume: 0.5 }
    mediaEls.add(audio)
    mediaEls.add(video)
    expect(mediaEls.size).toBe(2)
    mediaEls.delete(video)
    expect(mediaEls.size).toBe(1)
    expect(mediaEls.has(audio)).toBe(true)
  })

  // ===== clamp 工具 =====
  it('clamp 函数正确钳制音量', () => {
    expect(clamp(1.5, 0, 1)).toBe(1)
    expect(clamp(-0.5, 0, 1)).toBe(0)
    expect(clamp(0.6, 0, 1)).toBe(0.6)
  })
})