<template>
  <div class="user-form-container">
    <h1 class="page-title">{{ isEditing ? '编辑用户' : '新建用户' }}</h1>
    
    <div class="form-container">
      <form @submit.prevent="handleSubmit" class="user-form">
        <!-- Username Field -->
        <div class="form-group">
          <label for="username">用户名</label>
          <input 
            type="text" 
            id="username" 
            v-model="form.username"
            placeholder="请输入用户名"
            required
          />
          <div class="error-message" v-if="errors.username">
            {{ errors.username }}
          </div>
        </div>
        
        <!-- Email Field -->
        <div class="form-group">
          <label for="email">邮箱</label>
          <input 
            type="email" 
            id="email" 
            v-model="form.email"
            placeholder="请输入邮箱"
            required
          />
          <div class="error-message" v-if="errors.email">
            {{ errors.email }}
          </div>
        </div>
        
        <!-- Role Field -->
        <div class="form-group">
          <label for="role">角色</label>
          <CustomSelect
            v-model="form.role"
            :options="roleOptions"
            placeholder="请选择角色"
          />
          <div class="error-message" v-if="errors.role">
            {{ errors.role }}
          </div>
        </div>
        
        <!-- Status Field -->
        <div class="form-group">
          <label for="isActive">状态</label>
          <CustomSelect
            v-model="form.isActive"
            :options="statusOptions"
            placeholder="请选择状态"
          />
          <div class="error-message" v-if="errors.isActive">
            {{ errors.isActive }}
          </div>
        </div>
        
        <!-- Submit Buttons -->
        <div class="form-actions">
          <button type="button" class="cancel-btn" @click="handleCancel">
            取消
          </button>
          <button type="submit" class="submit-btn" :disabled="isSubmitting">
            {{ isSubmitting ? '提交中...' : (isEditing ? '更新用户' : '创建用户') }}
          </button>
        </div>
      </form>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, reactive, onMounted, computed } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { useToast } from '../../composables/useToast'
import { createUser, updateUser, fetchUser, User, API_BASE, getAuthHeaders } from '../../services/api'
import CustomSelect from '../../components/CustomSelect.vue'

const router = useRouter()
const route = useRoute()
const toast = useToast()

// Form state
const isSubmitting = ref(false)
const isEditing = computed(() => !!route.params.id)
const errors = reactive<Record<string, string>>({})

// Form data
const form = reactive({
  username: '',
  email: '',
  role: 'viewer',
  isActive: 1
})

// Select options
const roleOptions = [
  { value: 'admin', label: '管理员' },
  { value: 'editor', label: '编辑' },
  { value: 'viewer', label: '查看者' }
]

const statusOptions = [
  { value: 1, label: '激活' },
  { value: 0, label: '禁用' }
]

// Validation function
const validateForm = (): boolean => {
  // Reset errors
  Object.keys(errors).forEach(key => delete errors[key])
  
  let isValid = true
  
  // Validate username
  if (!form.username.trim()) {
    errors.username = '用户名不能为空'
    isValid = false
  }
  
  // Validate email
  if (!form.email.trim()) {
    errors.email = '邮箱不能为空'
    isValid = false
  } else if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(form.email)) {
    errors.email = '请输入有效的邮箱地址'
    isValid = false
  }
  
  // Validate role
  if (!form.role) {
    errors.role = '请选择角色'
    isValid = false
  }
  
  return isValid
}

// Submit handler
const handleSubmit = async () => {
  if (!validateForm()) {
    return
  }
  
  isSubmitting.value = true
  
  try {
    if (isEditing.value) {
      // Update existing user
      await updateUser(parseInt(route.params.id as string), form)
      toast.success('用户更新成功')
    } else {
      // Create new user
      await createUser(form)
      toast.success('用户创建成功')
    }
    
    // Redirect to users list
    router.push('/admin/users')
  } catch (error: any) {
    console.error('Error submitting form:', error)
    toast.error(error.message || (isEditing.value ? '更新用户失败' : '创建用户失败'))
  } finally {
    isSubmitting.value = false
  }
}

// Cancel handler
const handleCancel = () => {
  router.push('/admin/users')
}

// Lifecycle
onMounted(async () => {
  if (isEditing.value) {
    try {
      const userId = parseInt(route.params.id as string)
      console.log(`Fetching user data for ID: ${userId}`)
      
      // Direct fetch to debug
      const response = await fetch(`${API_BASE}/admin/users/${userId}`, {
        headers: getAuthHeaders()
      })
      
      console.log(`Response status: ${response.status}`)
      
      // Check response headers
      const contentType = response.headers.get('content-type')
      console.log(`Response content-type: ${contentType}`)
      
      // Read response as text first to debug
      const responseText = await response.text()
      console.log(`Response text: ${responseText}`)
      
      // Then try to parse as JSON
      if (!response.ok) {
        // If response is not ok, still try to parse as JSON
        let errorData
        try {
          errorData = JSON.parse(responseText)
          throw new Error(errorData.error || '获取用户详情失败')
        } catch (parseError) {
          throw new Error(`获取用户详情失败，响应格式错误: ${parseError.message}`)
        }
      }
      
      // Parse successful response
      const user = JSON.parse(responseText)
      console.log('Parsed user data:', user)
      
      // Populate form with user data
      form.username = user.username
      form.email = user.email
      form.role = user.role
      form.isActive = user.isActive
    } catch (error: any) {
      console.error('Failed to fetch user data:', error)
      console.error('Error stack:', error.stack)
      toast.error('加载用户数据失败: ' + (error.message || '未知错误'))
    }
  }
})
</script>

<style scoped>
.user-form-container {
  width: 100%;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: #d4b383;
  margin-bottom: 1.5rem;
  font-family: 'Inter', sans-serif;
}

.form-container {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-form {
  max-width: 600px;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0.5rem;
  font-family: 'Inter', sans-serif;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.5rem;
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.05);
  color: white;
  font-family: 'Inter', sans-serif;
}

.form-group input::placeholder,
.form-group select::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #d4b383;
  box-shadow: 0 0 0 3px rgba(212, 179, 131, 0.2);
}

.error-message {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  font-family: 'Inter', sans-serif;
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.cancel-btn {
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: 'Inter', sans-serif;
}

.cancel-btn:hover {
  background: rgba(212, 179, 131, 0.1);
  border-color: #d4b383;
  color: #d4b383;
}

.submit-btn {
  padding: 0.75rem 1.5rem;
  background-color: #d4b383;
  color: #050505;
  border: 1px solid #d4b383;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: 'Inter', sans-serif;
}

.submit-btn:hover:not(:disabled) {
  background-color: transparent;
  color: #d4b383;
  box-shadow: 0 0 15px rgba(212, 179, 131, 0.3);
  transform: translateY(-1px);
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive Design */
@media (max-width: 768px) {
  .form-container {
    padding: 1.5rem;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .cancel-btn,
  .submit-btn {
    width: 100%;
  }
}
</style>
