<template>
  <div class="role-form-container">
    <h1 class="page-title">{{ isEditing ? '编辑角色' : '新建角色' }}</h1>
    
    <div class="form-container">
      <form @submit.prevent="handleSubmit" class="role-form">
        <!-- Role Name Field -->
        <div class="form-group">
          <label for="name">角色名称</label>
          <input 
            type="text" 
            id="name" 
            v-model="form.name"
            placeholder="请输入角色名称"
            required
          />
          <div class="error-message" v-if="errors.name">
            {{ errors.name }}
          </div>
        </div>
        
        <!-- Description Field -->
        <div class="form-group">
          <label for="description">描述</label>
          <textarea 
            id="description" 
            v-model="form.description"
            placeholder="请输入角色描述"
            rows="4"
          ></textarea>
          <div class="error-message" v-if="errors.description">
            {{ errors.description }}
          </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 ? '更新角色' : '创建角色') }}
          </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 { createRole, updateRole, fetchRole } from '../../services/api'

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({
  name: '',
  description: ''
})

// Validation function
const validateForm = (): boolean => {
  // Reset errors
  Object.keys(errors).forEach(key => delete errors[key])
  
  let isValid = true
  
  // Validate name
  if (!form.name.trim()) {
    errors.name = '角色名称不能为空'
    isValid = false
  }
  
  return isValid
}

// Submit handler
const handleSubmit = async () => {
  if (!validateForm()) {
    return
  }
  
  isSubmitting.value = true
  
  try {
    if (isEditing.value) {
      // Update existing role
      await updateRole(parseInt(route.params.id as string), form)
      toast.success('角色更新成功')
    } else {
      // Create new role
      await createRole(form)
      toast.success('角色创建成功')
    }
    
    // Redirect to roles list
    router.push('/admin/roles')
  } catch (error: any) {
    console.error('Error submitting form:', error)
    toast.error(error.message || (isEditing.value ? '更新角色失败' : '创建角色失败'))
  } finally {
    isSubmitting.value = false
  }
}

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

// Lifecycle
onMounted(async () => {
  if (isEditing.value) {
    try {
      const roleId = parseInt(route.params.id as string)
      const role = await fetchRole(roleId)
      // Populate form with role data
      form.name = role.name
      form.description = role.description || ''
    } catch (error: any) {
      console.error('Failed to fetch role data:', error)
      toast.error('加载角色数据失败: ' + (error.message || '未知错误'))
    }
  }
})
</script>

<style scoped>
.role-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);
}

.role-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 textarea {
  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;
  resize: vertical;
}

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

.form-group input:focus,
.form-group textarea: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;
  transform: translateY(-1px);
  box-shadow: 0 0 15px rgba(212, 179, 131, 0.3);
}

.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>
