<template>
  <div class="knowledge-basic-container">
    <!-- 查看模式 -->
    <div v-if="type === 'view'" class="view-mode">
      <div class="info-section">
        <div class="avatar-section">
          <img v-if="knowledge?.avatar" :src="FILE_DOWNLOAD_URL + knowledge.avatar" alt="知识库头像" />
          <div v-else class="default-avatar">📚</div>
        </div>
        <div class="info-details">
          <h2 class="knowledge-name">{{ knowledge?.title || '未命名' }}</h2>
          <p class="knowledge-description">{{ knowledge?.description || '暂无描述' }}</p>
          <div class="meta-info">
            <div class="meta-item">
              <span class="label">状态：</span>
              <el-tag :type="knowledge?.status === 1 ? 'success' : 'info'" size="small">
                {{ knowledge?.status === 1 ? '已启用' : '已禁用' }}
              </el-tag>
            </div>
            <div class="meta-item" v-if="knowledge?.difyDatasetId">
              <span class="label">Dify数据集ID：</span>
              <span class="value">{{ knowledge.difyDatasetId }}</span>
            </div>
            <div class="meta-item">
              <span class="label">索引方式：</span>
              <span class="value">{{ getIndexingText(knowledge?.difyIndexingTechnique) }}</span>
            </div>
            <div class="meta-item" v-if="knowledge?.difyIndexingTechnique == 'high_quality'">
              <span class="label">Embedding模型：</span>
              <span class="value">{{ knowledge?.embeddingModel || '-' }}</span>
            </div>
            <div class="meta-item">
              <span class="label">文档数量：</span>
              <span class="value">{{ knowledge?.documentCount || 0 }}</span>
            </div>
            <div class="meta-item">
              <span class="label">创建时间：</span>
              <span class="value">{{ formatDate(knowledge?.createTime) }}</span>
            </div>
          </div>
        </div>
      </div>
    </div>

    <!-- 新增/编辑模式 -->
    <div v-else class="edit-mode">
      <el-form 
        ref="formRef" 
        :model="formData" 
        :rules="rules" 
        label-position="top"
        class="knowledge-form"
      >
        <el-form-item label="知识库标题" prop="title" required>
          <el-input
            v-model="formData.title"
            placeholder="请输入知识库标题"
            maxlength="100"
            show-word-limit
            :disabled="props.type === 'view'"
          />

        </el-form-item>

        <el-form-item label="知识库头像" prop="avatar">
          <FileUpload
            :cover-url="formData.avatar"
            @update:cover-url="handleAvatarUpdate"
            :as-dialog="false"
            list-type="cover"
            accept="image/*"
            :max-size="2"
            module="ai-knowledge"
            tip="点击上传知识库头像"
          />
        </el-form-item>

        <el-form-item label="知识库描述" prop="description">
          <el-input
            v-model="formData.description"
            type="textarea"
            :rows="4"
            placeholder="请输入知识库描述，介绍知识库的内容、用途等..."
            maxlength="500"
            show-word-limit
          />
        </el-form-item>

        <el-form-item label="索引方式" prop="difyIndexingTechnique" required>
          <el-radio-group v-model="formData.difyIndexingTechnique">
            <el-radio value="high_quality">
              <span class="radio-label">高质量</span>
              <span class="radio-desc">更精确的检索结果，消耗更多tokens</span>
            </el-radio>
            <el-radio 
              value="economy"
              :disabled="type === 'edit' && knowledge?.difyIndexingTechnique === 'high_quality'"
            >
              <span class="radio-label">经济</span>
              <span class="radio-desc">快速检索，消耗较少tokens</span>
            </el-radio>
          </el-radio-group>
          <div v-if="type === 'edit' && knowledge?.difyIndexingTechnique === 'high_quality'" class="form-tip">
            高质量模式不能降级为经济模式
          </div>
        </el-form-item>

        <el-form-item v-if="formData.difyIndexingTechnique == 'high_quality'" label="Embedding模型" prop="embeddingModel">
          <el-select
            v-model="formData.embeddingModel"
            placeholder="请选择Embedding模型（可选）"
            clearable
            filterable
            :loading="modelsLoading"
            @change="handleModelChange"
          >
            <el-option-group
              v-for="provider in embeddingModels"
              :key="provider.provider"
              :label="provider.label || provider.provider"
            >
              <el-option
                v-for="model in provider.models"
                :key="model.model"
                :label="getModelLabel(model)"
                :value="model.model"
                :data-provider="model.provider"
              >
                <span>{{ getModelLabel(model) }}</span>
                <span v-if="model.contextSize" style="float: right; color: var(--el-text-color-secondary); font-size: 13px">
                  上下文: {{ model.contextSize }}
                </span>
              </el-option>
            </el-option-group>
          </el-select>
          <div v-if="type === 'edit'" class="form-tip form-tip-success">
            可以切换Embedding模型以优化检索效果
          </div>
        </el-form-item>

        <el-form-item label="Dify数据集ID" prop="difyDatasetId">
          <el-input
            v-model="formData.difyDatasetId"
            placeholder="可选，如需关联现有Dify数据集请填写"
            :disabled="type === 'edit'"
          />
          <div v-if="type === 'edit'" class="form-tip">
            Dify数据集ID创建后不可修改
          </div>
        </el-form-item>

        <el-form-item label="状态" prop="status">
          <el-switch
            v-model="formData.status"
            :active-value="1"
            :inactive-value="0"
            active-text="启用"
            inactive-text="禁用"
          />
        </el-form-item>

        <div class="form-actions">
          <el-button type="primary" @click="handleSubmit" :loading="submitting">
            {{ type === 'add' ? '创建知识库' : '保存修改' }}
          </el-button>
          <el-button @click="handleCancel">
            取消
          </el-button>
        </div>
      </el-form>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, reactive, watch } from 'vue';
import { ElMessage, type FormInstance, type FormRules } from 'element-plus';
import { FileUpload } from '@/components/file';
import type { AiKnowledge } from '@/types/ai';
import { knowledgeApi } from '@/apis/ai';
import { FILE_DOWNLOAD_URL } from '@/config';

defineOptions({
  name: 'KnowledgeBasic'
});

interface KnowledgeBasicProps {
  type: 'view' | 'add' | 'edit';
  knowledge?: AiKnowledge | null;
}

const props = defineProps<KnowledgeBasicProps>();
const emit = defineEmits<{
  success: [knowledge: AiKnowledge];
  cancel: [];
}>();

// 表单引用
const formRef = ref<FormInstance>();
const submitting = ref(false);
const modelsLoading = ref(false);
const embeddingModels = ref<any[]>([]);

// 表单数据
const formData = reactive<Partial<AiKnowledge>>({
  title: '',
  avatar: '',
  description: '',
  difyIndexingTechnique: 'high_quality',
  embeddingModel: '',
  embeddingModelProvider: '',
  difyDatasetId: '',
  status: 1
});

// 表单验证规则
const rules: FormRules = {
  title: [
    { required: true, message: '请输入知识库标题', trigger: 'blur' },
    { min: 2, max: 100, message: '标题长度在2-100个字符之间', trigger: 'blur' }
  ],
  difyIndexingTechnique: [
    { required: true, message: '请选择索引方式', trigger: 'change' }
  ]
};

// 监听知识库数据变化
watch(() => props.knowledge, (newVal) => {
  if (newVal && (props.type === 'view' || props.type === 'edit')) {
    Object.assign(formData, {
      id: newVal.id,
      title: newVal.title,
      avatar: newVal.avatar,
      description: newVal.description,
      difyIndexingTechnique: newVal.difyIndexingTechnique || 'high_quality',
      embeddingModel: newVal.embeddingModel,
      embeddingModelProvider: newVal.embeddingModelProvider,
      difyDatasetId: newVal.difyDatasetId,
      status: newVal.status ?? 1
    });
  }
}, { immediate: true });

// 处理头像更新
function handleAvatarUpdate(val: string) {
  formData.avatar = val;
}

// 加载嵌入模型列表
async function loadEmbeddingModels() {
  try {
    modelsLoading.value = true;
    const result = await knowledgeApi.getAvailableEmbeddingModels();
    if (result.success && result.data) {
      // 按提供商分组
      const providers = result.data.providers || [];
      embeddingModels.value = providers.map((provider: any) => ({
        provider: provider.provider,
        label: provider.label?.zh_Hans || provider.label?.en_US || provider.provider,
        models: (provider.models || []).map((model: any) => ({
          model: model.model,
          provider: model.provider || provider.provider, // 添加 provider 到 model 对象
          label: model.label?.zh_Hans || model.label?.en_US || model.model,
          contextSize: model.model_properties?.context_size,
          status: model.status
        }))
      }));
    } else {
      ElMessage.warning('获取嵌入模型列表失败，使用默认选项');
      // 设置默认模型列表
      embeddingModels.value = [{
        provider: 'openai',
        label: 'OpenAI',
        models: [
          { model: 'text-embedding-ada-002', label: 'text-embedding-ada-002' },
          { model: 'text-embedding-3-small', label: 'text-embedding-3-small' },
          { model: 'text-embedding-3-large', label: 'text-embedding-3-large' }
        ]
      }];
    }
  } catch (error: any) {
    console.error('加载嵌入模型列表失败:', error);
    // 设置默认模型列表
    embeddingModels.value = [{
      provider: 'openai',
      label: 'OpenAI',
      models: [
        { model: 'text-embedding-ada-002', label: 'text-embedding-ada-002' },
        { model: 'text-embedding-3-small', label: 'text-embedding-3-small' },
        { model: 'text-embedding-3-large', label: 'text-embedding-3-large' }
      ]
    }];
  } finally {
    modelsLoading.value = false;
  }
}

// 获取模型显示标签
function getModelLabel(model: any): string {
  return model.label || model.model;
}

// 处理模型变化
function handleModelChange(modelName: string) {
  if (!modelName) {
    formData.embeddingModelProvider = '';
    return;
  }
  
  // 查找选中模型的提供商
  for (const providerGroup of embeddingModels.value) {
    const foundModel = providerGroup.models.find((m: any) => m.model === modelName);
    if (foundModel) {
      formData.embeddingModelProvider = foundModel.provider;
      console.log('选择模型:', modelName, '提供商:', foundModel.provider);
      break;
    }
  }
}

// 组件挂载时加载模型列表
loadEmbeddingModels();

// 提交表单
async function handleSubmit() {
  if (!formRef.value) return;
  
  try {
    const valid = await formRef.value.validate();
    if (!valid) return;
    
    submitting.value = true;
    
    if (props.type === 'add') {
      // 创建知识库
      const result = await knowledgeApi.createKnowledge(formData as AiKnowledge);
      if (result.success && result.data) {
        ElMessage.success('创建成功');
        emit('success', result.data);
      } else {
        ElMessage.error(result.message || '创建失败');
      }
    } else if (props.type === 'edit') {
      // 更新知识库
      const result = await knowledgeApi.updateKnowledge(formData as AiKnowledge);
      if (result.success && result.data) {
        ElMessage.success('保存成功');
        emit('success', result.data);
      } else {
        ElMessage.error(result.message || '保存失败');
      }
    }
  } catch (error: any) {
    console.error('提交失败:', error);
    ElMessage.error(props.type === 'add' ? '创建失败' : '保存失败');
  } finally {
    submitting.value = false;
  }
}

// 取消操作
function handleCancel() {
  emit('cancel');
}

// 获取索引方式文本
function getIndexingText(technique: string | undefined): string {
  switch (technique) {
    case 'high_quality':
      return '高质量';
    case 'economy':
      return '经济';
    default:
      return '-';
  }
}

// 格式化日期
function formatDate(date: string | Date | undefined): string {
  if (!date) return '-';
  const d = new Date(date);
  if (isNaN(d.getTime())) return '-';
  return d.toLocaleString('zh-CN', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit'
  });
}
</script>

<style scoped lang="scss">
.knowledge-basic-container {
  padding: 24px;
  background: #FFFFFF;
  border-radius: 14px;
  min-height: 400px;
}

// 查看模式样式
.view-mode {
  .info-section {
    display: flex;
    gap: 24px;
  }

  .avatar-section {
    width: 120px;
    height: 120px;
    border-radius: 12px;
    overflow: hidden;
    background: #F8F9FA;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);

    img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .default-avatar {
      font-size: 48px;
    }
  }

  .info-details {
    flex: 1;
    min-width: 0;

    .knowledge-name {
      font-size: 24px;
      font-weight: 600;
      color: #101828;
      margin: 0 0 12px 0;
      letter-spacing: -0.02em;
    }

    .knowledge-description {
      font-size: 14px;
      color: #667085;
      line-height: 1.6;
      margin: 0 0 24px 0;
    }

    .meta-info {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 16px;

      .meta-item {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;

        .label {
          color: #667085;
          font-weight: 500;
        }

        .value {
          color: #101828;
        }
      }
    }
  }
}

// 编辑模式样式
.edit-mode {
  .knowledge-form {
    max-width: 600px;

    :deep(.el-form-item__label) {
      font-weight: 500;
      color: #101828;
      margin-bottom: 8px;
    }

    :deep(.el-radio) {
      display: flex;
      align-items: flex-start;
      margin-bottom: 12px;
      height: auto;

      .el-radio__label {
        display: flex;
        flex-direction: column;
        gap: 4px;
        white-space: normal;
      }

      .radio-label {
        font-weight: 500;
        color: #101828;
      }

      .radio-desc {
        font-size: 13px;
        color: #667085;
        line-height: 1.4;
      }
    }

    .form-tip {
      margin-top: 8px;
      font-size: 13px;
      color: #F59E0B;
      line-height: 1.4;
    }

    .form-tip-success {
      color: #67C23A;
    }

    .form-actions {
      display: flex;
      gap: 12px;
      margin-top: 32px;
      padding-top: 24px;
      border-top: 1px solid #F3F3F5;

      .el-button {
        border-radius: 8px;
        font-weight: 500;
        padding: 12px 24px;

        &.el-button--primary {
          background: #E7000B;
          border-color: #E7000B;

          &:hover {
            background: #C90009;
          }
        }
      }
    }
  }
}

:deep(.el-switch) {
  .el-switch__label {
    font-size: 14px;
    color: #667085;

    &.is-active {
      color: #E7000B;
    }
  }
}
</style>
