<template>
  <div class="login-container">
    <div class="bg-container">
      <img :src="bgImg" alt="登录背景" />
    </div>
    <div class="bottom-text">
      <p>© Byz解忧杂货铺</p>
    </div>
    <div class="content-container">
        <button class="back-btn" @click="handleBack" title="返回主界面">
          返回主界面
        </button>
        <div class="form-content">
          <LoginModule ref="loginModuleRef" v-if="!showRegister" @register="showRegister = true" />
          <RegisterModule v-else @login="handleSwitchToLogin" />
        </div>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { useRouter } from 'vue-router'
import { hasValidToken } from '@/utils/jwt'
import loginBg from '@/assets/login_1.jpg'
import loginBg1 from '@/assets/login_2.jpg'
import loginBg3 from '@/assets/login_3.jpg'
import LoginModule from '@/components/login_module.vue'
import RegisterModule from '@/components/register_module.vue'

const images = [loginBg, loginBg1,loginBg3]
const randomIndex = Math.floor(Math.random() * images.length)
const bgImg = ref(images[randomIndex])

const router = useRouter()
const showRegister = ref(false)
const loginModuleRef = ref(null)

const handleBack = () => {
  router.push('/')
}

// 处理从注册模块切换到登录模块
const handleSwitchToLogin = () => {
  showRegister.value = false
  // 在下一个tick中重置登录表单，确保组件已经渲染
  setTimeout(() => {
    if (loginModuleRef.value) {
      loginModuleRef.value.resetForm()
    }
  }, 0)
}

// 检查登录状态，如果已登录则跳转到首页
onMounted(() => {
  if (hasValidToken()) {
    router.replace('/')
  }
})
</script>

<style scoped>
.login-container {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

.bg-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.bg-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left;
}

.content-container {
  position: relative;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  z-index: 2;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.back-btn {
  position: absolute;
  top: 18px;
  left: 18px;
  background: #e6f7ff;
  color: #409eff;
  border: none;
  border-radius: 18px;
  padding: 6px 18px 6px 14px;
  font-size: 15px;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(64,158,255,0.10);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 4px;
}
.back-btn:hover {
  background: #b3e5fc;
  color: #1976d2;
}

.form-content {
  width: 100%;
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (max-width: 600px) {
  .content-container {
    width: 100vw;
    height: 100vh;
    min-width: 0;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    transform: none;
    border-radius: 0;
    background: rgba(0,0,0,0.18);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 0 8px;
    justify-content: flex-start;
  }
  .back-btn {
    top: 18px;
    left: 18px;
    border-radius: 16px;
    font-size: 15px;
    padding: 6px 14px;
  }
  .form-content {
    margin-top: 64px;
    width: 100%;
    align-items: center;
  }
}

.bottom-text {
  position: absolute;
  left: 24px;
  bottom: 24px;
  z-index: 2;
  color: #fff;
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 1px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.25);
  background: rgba(0, 0, 0, 0.18);
  border-radius: 8px;
  padding: 6px 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  user-select: none;
  transition: background 0.3s;
}

.bottom-text p {
  margin: 0;
  opacity: 0.92;
}
</style>