package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"nex/backend/internal/config"
)

// ProviderHandler 供应商管理处理器
type ProviderHandler struct{}

// NewProviderHandler 创建供应商处理器
func NewProviderHandler() *ProviderHandler {
	return &ProviderHandler{}
}

// CreateProvider 创建供应商
func (h *ProviderHandler) CreateProvider(c *gin.Context) {
	var req struct {
		ID      string `json:"id" binding:"required"`
		Name    string `json:"name" binding:"required"`
		APIKey  string `json:"api_key" binding:"required"`
		BaseURL string `json:"base_url" binding:"required"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"error": "缺少必需字段: id, name, api_key, base_url",
		})
		return
	}

	// 创建供应商对象
	provider := &config.Provider{
		ID:      req.ID,
		Name:    req.Name,
		APIKey:  req.APIKey,
		BaseURL: req.BaseURL,
		Enabled: true, // 默认启用
	}

	// 保存到数据库
	err := config.CreateProvider(provider)
	if err != nil {
		// 检查是否是唯一约束错误（ID 重复）
		if err.Error() == "UNIQUE constraint failed: providers.id" {
			c.JSON(http.StatusConflict, gin.H{
				"error": "供应商 ID 已存在",
			})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "创建供应商失败: " + err.Error(),
		})
		return
	}

	// 掩码 API Key 后返回
	provider.MaskAPIKey()
	c.JSON(http.StatusCreated, provider)
}

// ListProviders 列出所有供应商
func (h *ProviderHandler) ListProviders(c *gin.Context) {
	providers, err := config.ListProviders()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "查询供应商失败: " + err.Error(),
		})
		return
	}

	c.JSON(http.StatusOK, providers)
}

// GetProvider 获取供应商
func (h *ProviderHandler) GetProvider(c *gin.Context) {
	id := c.Param("id")

	provider, err := config.GetProvider(id, true) // 掩码 API Key
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "供应商未找到",
			})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "查询供应商失败: " + err.Error(),
		})
		return
	}

	c.JSON(http.StatusOK, provider)
}

// UpdateProvider 更新供应商
func (h *ProviderHandler) UpdateProvider(c *gin.Context) {
	id := c.Param("id")

	var req map[string]interface{}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"error": "无效的请求格式",
		})
		return
	}

	// 更新供应商
	err := config.UpdateProvider(id, req)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "供应商未找到",
			})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "更新供应商失败: " + err.Error(),
		})
		return
	}

	// 返回更新后的供应商
	provider, err := config.GetProvider(id, true)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "查询更新后的供应商失败: " + err.Error(),
		})
		return
	}

	c.JSON(http.StatusOK, provider)
}

// DeleteProvider 删除供应商
func (h *ProviderHandler) DeleteProvider(c *gin.Context) {
	id := c.Param("id")

	// 删除供应商（级联删除模型）
	err := config.DeleteProvider(id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "供应商未找到",
			})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": "删除供应商失败: " + err.Error(),
		})
		return
	}

	// 删除关联的模型
	models, _ := config.ListModels("")
	for _, model := range models {
		if model.ProviderID == id {
			_ = config.DeleteModel(model.ID)
		}
	}

	c.Status(http.StatusNoContent)
}