package controllers

import (
	"errors"
	"hr_receiver/config"
	"hr_receiver/models"
	"net/http"
	"strconv"
	"strings"

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

type ProductSuiteAdminController struct {
	DB *gorm.DB
}

type productSuitePayload struct {
	Code            string  `json:"code"`
	Name            string  `json:"name"`
	ProjectTypeCode string  `json:"projectTypeCode"`
	RegionID        *uint32 `json:"regionId"`
	SoldTargetType  string  `json:"soldTargetType"`
	SoldTargetName  string  `json:"soldTargetName"`
	Notes           string  `json:"notes"`
	InventoryIDs    []uint  `json:"inventoryIds"`
}

type productSuiteListItem struct {
	models.ProductSuite
	Inventories []models.ProductInventory `json:"inventories"`
}

func NewProductSuiteAdminController() *ProductSuiteAdminController {
	return &ProductSuiteAdminController{DB: config.DB}
}

// @Summary 获取产品套件列表
// @Description 查询产品套件列表，含套件下的库存明细
// @Tags 产品套件管理
// @Produce json
// @Param keyword query string false "关键词(代码/名称/备注模糊搜索)"
// @Param projectTypeCode query string false "项目类型代码筛选"
// @Security BearerAuth
// @Success 200 {object} SwagAPIResponse "查询成功"
// @Router /admin/product-suites [get]
func (pc *ProductSuiteAdminController) List(c *gin.Context) {
	var suites []models.ProductSuite
	query := pc.DB.Model(&models.ProductSuite{}).Order("updated_at DESC, id DESC")

	if keyword := strings.TrimSpace(c.Query("keyword")); keyword != "" {
		likeValue := "%" + keyword + "%"
		query = query.Where("code LIKE ? OR name LIKE ? OR notes LIKE ?", likeValue, likeValue, likeValue)
	}
	if projectTypeCode := strings.TrimSpace(c.Query("projectTypeCode")); projectTypeCode != "" {
		query = query.Where("project_type_code = ?", strings.ToLower(projectTypeCode))
	}

	if err := query.Find(&suites).Error; err != nil {
		writeError(c, http.StatusInternalServerError, "failed to query product suites")
		return
	}

	result := make([]productSuiteListItem, 0, len(suites))
	for _, suite := range suites {
		var inventories []models.ProductInventory
		if err := pc.DB.Where("suite_id = ?", suite.ID).Order("updated_at DESC, id DESC").Find(&inventories).Error; err != nil {
			writeError(c, http.StatusInternalServerError, "failed to query suite inventories")
			return
		}
		result = append(result, productSuiteListItem{
			ProductSuite: suite,
			Inventories:  inventories,
		})
	}

	writeSuccess(c, http.StatusOK, "query success", result)
}

// @Summary 创建产品套件
// @Description 创建新的产品套件，可选关联库存记录
// @Tags 产品套件管理
// @Accept json
// @Produce json
// @Param suite body productSuitePayload true "套件信息"
// @Security BearerAuth
// @Success 201 {object} SwagAPIResponse "创建成功"
// @Failure 400 {object} SwagAPIResponse "请求参数错误"
// @Router /admin/product-suites [post]
func (pc *ProductSuiteAdminController) Create(c *gin.Context) {
	var payload productSuitePayload
	if err := c.ShouldBindJSON(&payload); err != nil {
		writeError(c, http.StatusBadRequest, err.Error())
		return
	}
	if err := pc.validatePayload(payload); err != nil {
		writeError(c, http.StatusBadRequest, err.Error())
		return
	}

	record := models.ProductSuite{
		Code:            payload.Code,
		Name:            payload.Name,
		ProjectTypeCode: payload.ProjectTypeCode,
		RegionID:        payload.RegionID,
		SoldTargetType:  payload.SoldTargetType,
		SoldTargetName:  payload.SoldTargetName,
		Notes:           payload.Notes,
	}

	if err := pc.DB.Transaction(func(tx *gorm.DB) error {
		if err := tx.Create(&record).Error; err != nil {
			return err
		}
		return pc.syncSuiteInventories(tx, record, payload.InventoryIDs)
	}); err != nil {
		if strings.Contains(strings.ToLower(err.Error()), "unique") {
			writeError(c, http.StatusConflict, "suite code already exists")
			return
		}
		writeError(c, http.StatusInternalServerError, "failed to create suite")
		return
	}

	writeSuccess(c, http.StatusCreated, "create success", record)
}

// @Summary 更新产品套件
// @Description 更新指定产品套件的信息和关联库存
// @Tags 产品套件管理
// @Accept json
// @Produce json
// @Param id path int true "套件ID"
// @Param suite body productSuitePayload true "更新信息"
// @Security BearerAuth
// @Success 200 {object} SwagAPIResponse "更新成功"
// @Failure 400 {object} SwagAPIResponse "请求参数错误"
// @Failure 404 {object} SwagAPIResponse "套件不存在"
// @Router /admin/product-suites/{id} [put]
func (pc *ProductSuiteAdminController) Update(c *gin.Context) {
	record, err := pc.findByID(c.Param("id"))
	if err != nil {
		respondProductSuiteLookupError(c, err)
		return
	}

	var payload productSuitePayload
	if err := c.ShouldBindJSON(&payload); err != nil {
		writeError(c, http.StatusBadRequest, err.Error())
		return
	}
	if err := pc.validatePayload(payload); err != nil {
		writeError(c, http.StatusBadRequest, err.Error())
		return
	}

	record.Code = payload.Code
	record.Name = payload.Name
	record.ProjectTypeCode = payload.ProjectTypeCode
	record.RegionID = payload.RegionID
	record.SoldTargetType = payload.SoldTargetType
	record.SoldTargetName = payload.SoldTargetName
	record.Notes = payload.Notes

	if err := pc.DB.Transaction(func(tx *gorm.DB) error {
		if err := tx.Save(&record).Error; err != nil {
			return err
		}
		return pc.syncSuiteInventories(tx, record, payload.InventoryIDs)
	}); err != nil {
		if strings.Contains(strings.ToLower(err.Error()), "unique") {
			writeError(c, http.StatusConflict, "suite code already exists")
			return
		}
		writeError(c, http.StatusInternalServerError, "failed to update suite")
		return
	}

	writeSuccess(c, http.StatusOK, "update success", record)
}

// @Summary 删除产品套件
// @Description 删除指定产品套件，自动解除关联库存的绑定
// @Tags 产品套件管理
// @Produce json
// @Param id path int true "套件ID"
// @Security BearerAuth
// @Success 200 {object} SwagAPIResponse "删除成功"
// @Failure 404 {object} SwagAPIResponse "套件不存在"
// @Router /admin/product-suites/{id} [delete]
func (pc *ProductSuiteAdminController) Delete(c *gin.Context) {
	record, err := pc.findByID(c.Param("id"))
	if err != nil {
		respondProductSuiteLookupError(c, err)
		return
	}

	if err := pc.DB.Transaction(func(tx *gorm.DB) error {
		if err := tx.Model(&models.ProductInventory{}).Where("suite_id = ?", record.ID).Updates(map[string]interface{}{
			"suite_id":   nil,
			"suite_code": "",
		}).Error; err != nil {
			return err
		}
		return tx.Delete(&record).Error
	}); err != nil {
		writeError(c, http.StatusInternalServerError, "failed to delete suite")
		return
	}

	writeSuccess(c, http.StatusOK, "delete success", nil)
}

func (pc *ProductSuiteAdminController) findByID(id string) (models.ProductSuite, error) {
	var record models.ProductSuite
	numericID, err := strconv.ParseUint(strings.TrimSpace(id), 10, 64)
	if err != nil {
		return record, gorm.ErrRecordNotFound
	}
	if err := pc.DB.First(&record, numericID).Error; err != nil {
		return record, err
	}
	return record, nil
}

func (pc *ProductSuiteAdminController) validatePayload(payload productSuitePayload) error {
	if strings.TrimSpace(payload.Code) == "" {
		return errors.New("code is required")
	}
	if strings.TrimSpace(payload.Name) == "" {
		return errors.New("name is required")
	}
	if strings.TrimSpace(payload.ProjectTypeCode) != "" {
		var projectType models.ProjectType
		if err := pc.DB.Where("code = ? AND is_active = ?", strings.ToLower(strings.TrimSpace(payload.ProjectTypeCode)), true).First(&projectType).Error; err != nil {
			if errors.Is(err, gorm.ErrRecordNotFound) {
				return errors.New("projectTypeCode is invalid")
			}
			return errors.New("failed to query project type")
		}
	}
	if strings.TrimSpace(payload.SoldTargetType) != "" {
		switch strings.ToLower(strings.TrimSpace(payload.SoldTargetType)) {
		case "kindergarten", "school", "dealer", "person", "other":
		default:
			return errors.New("soldTargetType is invalid")
		}
	}
	return nil
}

func (pc *ProductSuiteAdminController) syncSuiteInventories(tx *gorm.DB, suite models.ProductSuite, inventoryIDs []uint) error {
	if err := tx.Model(&models.ProductInventory{}).Where("suite_id = ?", suite.ID).Updates(map[string]interface{}{
		"suite_id":   nil,
		"suite_code": "",
	}).Error; err != nil {
		return err
	}
	if len(inventoryIDs) == 0 {
		return nil
	}

	var count int64
	if err := tx.Model(&models.ProductInventory{}).Where("id IN ?", inventoryIDs).Count(&count).Error; err != nil {
		return err
	}
	if count != int64(len(inventoryIDs)) {
		return errors.New("some inventory records do not exist")
	}

	return tx.Model(&models.ProductInventory{}).Where("id IN ?", inventoryIDs).Updates(map[string]interface{}{
		"suite_id":   suite.ID,
		"suite_code": suite.Code,
	}).Error
}

func respondProductSuiteLookupError(c *gin.Context, err error) {
	if errors.Is(err, gorm.ErrRecordNotFound) {
		writeError(c, http.StatusNotFound, "product suite not found")
		return
	}
	writeError(c, http.StatusInternalServerError, "failed to query product suite")
}