package management

import (
	"errors"
	"strconv"

	"git.huangwc.com/pig/pig-farm-controller/internal/app/controller"
	"git.huangwc.com/pig/pig-farm-controller/internal/app/service"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/logs"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// --- 数据传输对象 (DTOs) ---

// PigHouseResponse 定义了猪舍信息的响应结构
type PigHouseResponse struct {
	ID          uint   `json:"id"`
	Name        string `json:"name"`
	Description string `json:"description"`
}

// PenResponse 定义了猪栏信息的响应结构
type PenResponse struct {
	ID         uint             `json:"id"`
	PenNumber  string           `json:"pen_number"`
	HouseID    uint             `json:"house_id"`
	Capacity   int              `json:"capacity"`
	Status     models.PenStatus `json:"status"`
	PigBatchID uint             `json:"pig_batch_id"`
}

// CreatePigHouseRequest 定义了创建猪舍的请求结构
type CreatePigHouseRequest struct {
	Name        string `json:"name" binding:"required"`
	Description string `json:"description"`
}

// UpdatePigHouseRequest 定义了更新猪舍的请求结构
type UpdatePigHouseRequest struct {
	Name        string `json:"name" binding:"required"`
	Description string `json:"description"`
}

// CreatePenRequest 定义了创建猪栏的请求结构
type CreatePenRequest struct {
	PenNumber string           `json:"pen_number" binding:"required"`
	HouseID   uint             `json:"house_id" binding:"required"`
	Capacity  int              `json:"capacity" binding:"required"`
	Status    models.PenStatus `json:"status" binding:"required"`
}

// UpdatePenRequest 定义了更新猪栏的请求结构
type UpdatePenRequest struct {
	PenNumber string           `json:"pen_number" binding:"required"`
	HouseID   uint             `json:"house_id" binding:"required"`
	Capacity  int              `json:"capacity" binding:"required"`
	Status    models.PenStatus `json:"status" binding:"required"`
}

// --- 控制器定义 ---

// PigFarmController 负责处理猪舍和猪栏相关的API请求
type PigFarmController struct {
	logger  *logs.Logger
	service service.PigFarmService
}

// NewPigFarmController 创建一个新的 PigFarmController 实例
func NewPigFarmController(logger *logs.Logger, service service.PigFarmService) *PigFarmController {
	return &PigFarmController{
		logger:  logger,
		service: service,
	}
}

// --- 猪舍 (PigHouse) API 实现 ---

// CreatePigHouse godoc
// @Summary      创建猪舍
// @Description  创建一个新的猪舍
// @Tags         猪场管理
// @Accept       json
// @Produce      json
// @Param        body body CreatePigHouseRequest true "猪舍信息"
// @Success      201 {object} controller.Response{data=PigHouseResponse} "创建成功"
// @Router       /api/v1/pighouses [post]
func (c *PigFarmController) CreatePigHouse(ctx *gin.Context) {
	const action = "创建猪舍"
	var req CreatePigHouseRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的请求体", action, "请求体绑定失败", req)
		return
	}

	house, err := c.service.CreatePigHouse(req.Name, req.Description)
	if err != nil {
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "创建猪舍失败", action, "业务逻辑失败", req)
		return
	}

	resp := PigHouseResponse{
		ID:          house.ID,
		Name:        house.Name,
		Description: house.Description,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeCreated, "创建成功", resp, action, "创建成功", resp)
}

// GetPigHouse godoc
// @Summary      获取单个猪舍
// @Description  根据ID获取单个猪舍信息
// @Tags         猪场管理
// @Produce      json
// @Param        id path int true "猪舍ID"
// @Success      200 {object} controller.Response{data=PigHouseResponse} "获取成功"
// @Router       /api/v1/pighouses/{id} [get]
func (c *PigFarmController) GetPigHouse(ctx *gin.Context) {
	const action = "获取猪舍"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	house, err := c.service.GetPigHouseByID(uint(id))
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪舍不存在", action, "猪舍不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "获取猪舍失败", action, "业务逻辑失败", id)
		return
	}

	resp := PigHouseResponse{
		ID:          house.ID,
		Name:        house.Name,
		Description: house.Description,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "获取成功", resp, action, "获取成功", resp)
}

// ListPigHouses godoc
// @Summary      获取猪舍列表
// @Description  获取所有猪舍的列表
// @Tags         猪场管理
// @Produce      json
// @Success      200 {object} controller.Response{data=[]PigHouseResponse} "获取成功"
// @Router       /api/v1/pighouses [get]
func (c *PigFarmController) ListPigHouses(ctx *gin.Context) {
	const action = "获取猪舍列表"
	houses, err := c.service.ListPigHouses()
	if err != nil {
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "获取列表失败", action, "业务逻辑失败", nil)
		return
	}

	var resp []PigHouseResponse
	for _, house := range houses {
		resp = append(resp, PigHouseResponse{
			ID:          house.ID,
			Name:        house.Name,
			Description: house.Description,
		})
	}

	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "获取成功", resp, action, "获取成功", resp)
}

// UpdatePigHouse godoc
// @Summary      更新猪舍
// @Description  更新一个已存在的猪舍信息
// @Tags         猪场管理
// @Accept       json
// @Produce      json
// @Param        id path int true "猪舍ID"
// @Param        body body UpdatePigHouseRequest true "猪舍信息"
// @Success      200 {object} controller.Response{data=PigHouseResponse} "更新成功"
// @Router       /api/v1/pighouses/{id} [put]
func (c *PigFarmController) UpdatePigHouse(ctx *gin.Context) {
	const action = "更新猪舍"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	var req UpdatePigHouseRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的请求体", action, "请求体绑定失败", req)
		return
	}

	house, err := c.service.UpdatePigHouse(uint(id), req.Name, req.Description)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪舍不存在", action, "猪舍不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "更新失败", action, "业务逻辑失败", req)
		return
	}

	resp := PigHouseResponse{
		ID:          house.ID,
		Name:        house.Name,
		Description: house.Description,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "更新成功", resp, action, "更新成功", resp)
}

// DeletePigHouse godoc
// @Summary      删除猪舍
// @Description  根据ID删除一个猪舍
// @Tags         猪场管理
// @Produce      json
// @Param        id path int true "猪舍ID"
// @Success      200 {object} controller.Response "删除成功"
// @Router       /api/v1/pighouses/{id} [delete]
func (c *PigFarmController) DeletePigHouse(ctx *gin.Context) {
	const action = "删除猪舍"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	if err := c.service.DeletePigHouse(uint(id)); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪舍不存在", action, "猪舍不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "删除失败", action, "业务逻辑失败", id)
		return
	}

	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "删除成功", nil, action, "删除成功", id)
}

// --- 猪栏 (Pen) API 实现 ---

// CreatePen godoc
// @Summary      创建猪栏
// @Description  创建一个新的猪栏
// @Tags         猪场管理
// @Accept       json
// @Produce      json
// @Param        body body CreatePenRequest true "猪栏信息"
// @Success      201 {object} controller.Response{data=PenResponse} "创建成功"
// @Router       /api/v1/pens [post]
func (c *PigFarmController) CreatePen(ctx *gin.Context) {
	const action = "创建猪栏"
	var req CreatePenRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的请求体", action, "请求体绑定失败", req)
		return
	}

	pen, err := c.service.CreatePen(req.PenNumber, req.HouseID, req.Capacity, req.Status)
	if err != nil {
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "创建猪栏失败", action, "业务逻辑失败", req)
		return
	}

	resp := PenResponse{
		ID:         pen.ID,
		PenNumber:  pen.PenNumber,
		HouseID:    pen.HouseID,
		Capacity:   pen.Capacity,
		Status:     pen.Status,
		PigBatchID: pen.PigBatchID,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeCreated, "创建成功", resp, action, "创建成功", resp)
}

// GetPen godoc
// @Summary      获取单个猪栏
// @Description  根据ID获取单个猪栏信息
// @Tags         猪场管理
// @Produce      json
// @Param        id path int true "猪栏ID"
// @Success      200 {object} controller.Response{data=PenResponse} "获取成功"
// @Router       /api/v1/pens/{id} [get]
func (c *PigFarmController) GetPen(ctx *gin.Context) {
	const action = "获取猪栏"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	pen, err := c.service.GetPenByID(uint(id))
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪栏不存在", action, "猪栏不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "获取猪栏失败", action, "业务逻辑失败", id)
		return
	}

	resp := PenResponse{
		ID:         pen.ID,
		PenNumber:  pen.PenNumber,
		HouseID:    pen.HouseID,
		Capacity:   pen.Capacity,
		Status:     pen.Status,
		PigBatchID: pen.PigBatchID,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "获取成功", resp, action, "获取成功", resp)
}

// ListPens godoc
// @Summary      获取猪栏列表
// @Description  获取所有猪栏的列表
// @Tags         猪场管理
// @Produce      json
// @Success      200 {object} controller.Response{data=[]PenResponse} "获取成功"
// @Router       /api/v1/pens [get]
func (c *PigFarmController) ListPens(ctx *gin.Context) {
	const action = "获取猪栏列表"
	pens, err := c.service.ListPens()
	if err != nil {
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "获取列表失败", action, "业务逻辑失败", nil)
		return
	}

	var resp []PenResponse
	for _, pen := range pens {
		resp = append(resp, PenResponse{
			ID:         pen.ID,
			PenNumber:  pen.PenNumber,
			HouseID:    pen.HouseID,
			Capacity:   pen.Capacity,
			Status:     pen.Status,
			PigBatchID: pen.PigBatchID,
		})
	}

	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "获取成功", resp, action, "获取成功", resp)
}

// UpdatePen godoc
// @Summary      更新猪栏
// @Description  更新一个已存在的猪栏信息
// @Tags         猪场管理
// @Accept       json
// @Produce      json
// @Param        id path int true "猪栏ID"
// @Param        body body UpdatePenRequest true "猪栏信息"
// @Success      200 {object} controller.Response{data=PenResponse} "更新成功"
// @Router       /api/v1/pens/{id} [put]
func (c *PigFarmController) UpdatePen(ctx *gin.Context) {
	const action = "更新猪栏"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	var req UpdatePenRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的请求体", action, "请求体绑定失败", req)
		return
	}

	pen, err := c.service.UpdatePen(uint(id), req.PenNumber, req.HouseID, req.Capacity, req.Status)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪栏不存在", action, "猪栏不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "更新失败", action, "业务逻辑失败", req)
		return
	}

	resp := PenResponse{
		ID:         pen.ID,
		PenNumber:  pen.PenNumber,
		HouseID:    pen.HouseID,
		Capacity:   pen.Capacity,
		Status:     pen.Status,
		PigBatchID: pen.PigBatchID,
	}
	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "更新成功", resp, action, "更新成功", resp)
}

// DeletePen godoc
// @Summary      删除猪栏
// @Description  根据ID删除一个猪栏
// @Tags         猪场管理
// @Produce      json
// @Param        id path int true "猪栏ID"
// @Success      200 {object} controller.Response "删除成功"
// @Router       /api/v1/pens/{id} [delete]
func (c *PigFarmController) DeletePen(ctx *gin.Context) {
	const action = "删除猪栏"
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		controller.SendErrorWithAudit(ctx, controller.CodeBadRequest, "无效的ID格式", action, "ID格式错误", ctx.Param("id"))
		return
	}

	if err := c.service.DeletePen(uint(id)); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			controller.SendErrorWithAudit(ctx, controller.CodeNotFound, "猪栏不存在", action, "猪栏不存在", id)
			return
		}
		c.logger.Errorf("%s: 业务逻辑失败: %v", action, err)
		controller.SendErrorWithAudit(ctx, controller.CodeInternalError, "删除失败", action, "业务逻辑失败", id)
		return
	}

	controller.SendSuccessWithAudit(ctx, controller.CodeSuccess, "删除成功", nil, action, "删除成功", id)
}