<template>
  <Teleport to="body">
    <Transition name="toast" appear>
      <div 
        v-if="visible && message" 
        class="toast"
        :class="[type, position]"
        @click="handleClick"
      >
        <div class="toast-content">
          <!-- 图标 -->
          <div class="toast-icon" v-if="showIcon">
            <i :class="iconClass"></i>
          </div>
          
          <!-- 消息内容 -->
          <div class="toast-message">{{ message }}</div>
        </div>
      </div>
    </Transition>
  </Teleport>
</template>

<script setup>
import { ref, computed, onMounted, onUnmounted } from 'vue'

const props = defineProps({
  // 消息内容
  message: {
    type: String,
    default: ''
  },
  
  // 类型：success, error, warning, info
  type: {
    type: String,
    default: 'info',
    validator: (value) => ['success', 'error', 'warning', 'info'].includes(value)
  },
  
  // 显示时长（毫秒）
  duration: {
    type: Number,
    default: 3000
  },
  
  // 位置：top, center, bottom
  position: {
    type: String,
    default: 'top',
    validator: (value) => ['top', 'center', 'bottom'].includes(value)
  },
  
  // 是否显示图标
  showIcon: {
    type: Boolean,
    default: true
  },
  
  // 是否可点击关闭
  closable: {
    type: Boolean,
    default: true
  }
})

const emit = defineEmits(['close'])

const visible = ref(false)
let timer = null

// 图标映射
const iconClass = computed(() => {
  const iconMap = {
    success: 'fas fa-check-circle',
    error: 'fas fa-times-circle',
    warning: 'fas fa-exclamation-triangle',
    info: 'fas fa-info-circle'
  }
  
  return iconMap[props.type] || iconMap.info
})

// 处理点击事件
const handleClick = () => {
  if (props.closable) {
    close()
  }
}

// 显示Toast
const show = () => {
  visible.value = true
  
  if (props.duration > 0) {
    timer = setTimeout(() => {
      close()
    }, props.duration)
  }
}

// 关闭Toast
const close = () => {
  visible.value = false
  if (timer) {
    clearTimeout(timer)
    timer = null
  }
  emit('close')
}

// 生命周期
onMounted(() => {
  show()
})

onUnmounted(() => {
  if (timer) {
    clearTimeout(timer)
  }
})

// 暴露方法给父组件
defineExpose({
  close
})
</script>

<style scoped>
.toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  max-width: calc(100vw - 32px);
  min-width: 200px;
}

.toast.top {
  top: 20px;
}

.toast.center {
  top: 50%;
  transform: translate(-50%, -50%);
}

.toast.bottom {
  bottom: 20px;
}

.toast-content {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.toast-icon {
  flex-shrink: 0;
}

.toast-icon i {
  font-size: 16px;
}

.toast-message {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

/* 类型样式 */
.toast.success .toast-icon i {
  color: #48bb78;
}

.toast.success .toast-content {
  border-color: rgba(72, 187, 120, 0.3);
}

.toast.error .toast-icon i {
  color: #e53e3e;
}

.toast.error .toast-content {
  border-color: rgba(229, 62, 62, 0.3);
}

.toast.warning .toast-icon i {
  color: #ed8936;
}

.toast.warning .toast-content {
  border-color: rgba(237, 137, 54, 0.3);
}

.toast.info .toast-icon i {
  color: #3182ce;
}

.toast.info .toast-content {
  border-color: rgba(49, 130, 206, 0.3);
}

/* 动画 */
.toast-enter-active,
.toast-leave-active {
  transition: all 0.3s ease-out;
}

.toast-enter-from {
  opacity: 0;
  transform: translateX(-50%) translateY(-20px);
}

.toast.center.toast-enter-from {
  transform: translate(-50%, -50%) scale(0.9);
}

.toast.bottom.toast-enter-from {
  transform: translateX(-50%) translateY(20px);
}

.toast-leave-to {
  opacity: 0;
  transform: translateX(-50%) translateY(-20px);
}

.toast.center.toast-leave-to {
  transform: translate(-50%, -50%) scale(0.9);
}

.toast.bottom.toast-leave-to {
  transform: translateX(-50%) translateY(20px);
}

/* 响应式 */
@media (max-width: 375px) {
  .toast {
    max-width: calc(100vw - 24px);
    min-width: auto;
  }
  
  .toast-content {
    padding: 10px 14px;
    gap: 10px;
  }
  
  .toast-icon i {
    font-size: 14px;
  }
  
  .toast-message {
    font-size: 13px;
  }
}

/* 触摸反馈 */
@media (hover: none) {
  .toast-content:active {
    transform: scale(0.98);
  }
}
</style>