package handler

import (
	"net/http"

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

	appErrors "nex/backend/pkg/errors"

	"nex/backend/internal/domain"
	"nex/backend/internal/service"
)

// ModelHandler 模型管理处理器
type ModelHandler struct {
	modelService service.ModelService
}

// NewModelHandler 创建模型处理器
func NewModelHandler(modelService service.ModelService) *ModelHandler {
	return &ModelHandler{modelService: modelService}
}

// CreateModel 创建模型
func (h *ModelHandler) CreateModel(c *gin.Context) {
	var req struct {
		ID         string `json:"id" binding:"required"`
		ProviderID string `json:"provider_id" binding:"required"`
		ModelName  string `json:"model_name" binding:"required"`
	}

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

	model := &domain.Model{
		ID:         req.ID,
		ProviderID: req.ProviderID,
		ModelName:  req.ModelName,
	}

	err := h.modelService.Create(model)
	if err != nil {
		if err == appErrors.ErrProviderNotFound {
			c.JSON(http.StatusBadRequest, gin.H{
				"error": "供应商不存在",
			})
			return
		}
		writeError(c, err)
		return
	}

	c.JSON(http.StatusCreated, model)
}

// ListModels 列出模型
func (h *ModelHandler) ListModels(c *gin.Context) {
	providerID := c.Query("provider_id")

	models, err := h.modelService.List(providerID)
	if err != nil {
		writeError(c, err)
		return
	}

	c.JSON(http.StatusOK, models)
}

// GetModel 获取模型
func (h *ModelHandler) GetModel(c *gin.Context) {
	id := c.Param("id")

	model, err := h.modelService.Get(id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "模型未找到",
			})
			return
		}
		writeError(c, err)
		return
	}

	c.JSON(http.StatusOK, model)
}

// UpdateModel 更新模型
func (h *ModelHandler) UpdateModel(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
	}

	err := h.modelService.Update(id, req)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "模型未找到",
			})
			return
		}
		if err == appErrors.ErrProviderNotFound {
			c.JSON(http.StatusBadRequest, gin.H{
				"error": "供应商不存在",
			})
			return
		}
		writeError(c, err)
		return
	}

	model, err := h.modelService.Get(id)
	if err != nil {
		writeError(c, err)
		return
	}

	c.JSON(http.StatusOK, model)
}

// DeleteModel 删除模型
func (h *ModelHandler) DeleteModel(c *gin.Context) {
	id := c.Param("id")

	err := h.modelService.Delete(id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusNotFound, gin.H{
				"error": "模型未找到",
			})
			return
		}
		writeError(c, err)
		return
	}

	c.Status(http.StatusNoContent)
}