package admin

import (
	"FileRelay/internal/bootstrap"
	"FileRelay/internal/model"
	"FileRelay/internal/service"
	"net/http"
	"strconv"
	"time"

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

type BatchHandler struct {
	batchService *service.BatchService
}

func NewBatchHandler() *BatchHandler {
	return &BatchHandler{
		batchService: service.NewBatchService(),
	}
}

type ListBatchesResponse struct {
	Total    int64             `json:"total"`
	Page     int               `json:"page"`
	PageSize int               `json:"page_size"`
	Data     []model.FileBatch `json:"data"`
}

type UpdateBatchRequest struct {
	Remark       string     `json:"remark"`
	ExpireType   string     `json:"expire_type"`
	ExpireAt     *time.Time `json:"expire_at"`
	MaxDownloads int        `json:"max_downloads"`
	Status       string     `json:"status"`
}

// ListBatches 获取批次列表
// @Summary      获取批次列表
// @Description  分页查询所有文件批次，支持按状态过滤和取件码模糊搜索
// @Tags         Admin
// @Security     AdminAuth
// @Param        page         query     int     false  "页码 (默认 1)"
// @Param        page_size    query     int     false  "每页数量 (默认 20)"
// @Param        status       query     string  false  "状态 (active/expired/deleted)"
// @Param        pickup_code  query     string  false  "取件码 (模糊搜索)"
// @Produce      json
// @Success      200  {object}  model.Response{data=ListBatchesResponse}
// @Failure      401  {object}  model.Response
// @Router       /admin/batches [get]
func (h *BatchHandler) ListBatches(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 20
	}
	status := c.Query("status")
	pickupCode := c.Query("pickup_code")

	query := bootstrap.DB.Model(&model.FileBatch{})
	if status != "" {
		query = query.Where("status = ?", status)
	}
	if pickupCode != "" {
		query = query.Where("pickup_code LIKE ?", "%"+pickupCode+"%")
	}

	var total int64
	query.Count(&total)

	var batches []model.FileBatch
	err := query.Offset((page - 1) * pageSize).Limit(pageSize).Order("created_at DESC").Find(&batches).Error
	if err != nil {
		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, err.Error()))
		return
	}

	c.JSON(http.StatusOK, model.SuccessResponse(ListBatchesResponse{
		Total:    total,
		Page:     page,
		PageSize: pageSize,
		Data:     batches,
	}))
}

// GetBatch 获取批次详情
// @Summary      获取批次详情
// @Description  根据批次 ID 获取批次信息及关联的文件列表
// @Tags         Admin
// @Security     AdminAuth
// @Param        batch_id  path  int  true  "批次 ID"
// @Produce      json
// @Success      200  {object}  model.Response{data=model.FileBatch}
// @Failure      404  {object}  model.Response
// @Router       /admin/batch/{batch_id} [get]
func (h *BatchHandler) GetBatch(c *gin.Context) {
	id := c.Param("batch_id")
	var batch model.FileBatch
	if err := bootstrap.DB.Preload("FileItems").First(&batch, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.ErrorResponse(model.CodeNotFound, "batch not found"))
		return
	}
	c.JSON(http.StatusOK, model.SuccessResponse(batch))
}

// UpdateBatch 修改批次信息
// @Summary      修改批次信息
// @Description  允许修改备注、过期策略、最大下载次数、状态等
// @Tags         Admin
// @Security     AdminAuth
// @Accept       json
// @Produce      json
// @Param        batch_id  path  int  true  "批次 ID"
// @Param        request body UpdateBatchRequest true "修改内容"
// @Success      200  {object}  model.Response{data=model.FileBatch}
// @Failure      400  {object}  model.Response
// @Router       /admin/batch/{batch_id} [put]
func (h *BatchHandler) UpdateBatch(c *gin.Context) {
	id := c.Param("batch_id")
	var batch model.FileBatch
	if err := bootstrap.DB.First(&batch, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.ErrorResponse(model.CodeNotFound, "batch not found"))
		return
	}

	var input UpdateBatchRequest

	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, model.ErrorResponse(model.CodeBadRequest, err.Error()))
		return
	}

	updates := make(map[string]interface{})
	updates["remark"] = input.Remark
	updates["expire_type"] = input.ExpireType
	updates["expire_at"] = input.ExpireAt
	updates["max_downloads"] = input.MaxDownloads
	updates["status"] = input.Status

	if err := bootstrap.DB.Model(&batch).Updates(updates).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, err.Error()))
		return
	}

	c.JSON(http.StatusOK, model.SuccessResponse(batch))
}

// DeleteBatch 删除批次
// @Summary      删除批次
// @Description  标记批次为已删除，并物理删除关联的存储文件
// @Tags         Admin
// @Security     AdminAuth
// @Param        batch_id  path  int  true  "批次 ID"
// @Produce      json
// @Success      200  {object}  model.Response
// @Failure      500  {object}  model.Response
// @Router       /admin/batch/{batch_id} [delete]
func (h *BatchHandler) DeleteBatch(c *gin.Context) {
	idStr := c.Param("batch_id")
	id, _ := strconv.ParseUint(idStr, 10, 32)

	if err := h.batchService.DeleteBatch(c.Request.Context(), uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, err.Error()))
		return
	}

	c.JSON(http.StatusOK, model.SuccessResponse(map[string]interface{}{}))
}