package controller

import (
	"strconv"
	"strings"

	"seeyon-filesystem/dto"
	"seeyon-filesystem/middleware"
	"seeyon-filesystem/service"
	"seeyon-filesystem/utils"

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

// FolderController 文件夹控制器
type FolderController struct {
	folderService *service.FolderService
}

// NewFolderController 创建文件夹控制器实例
func NewFolderController() *FolderController {
	return &FolderController{
		folderService: service.NewFolderService(),
	}
}

// Create 创建文件夹
// POST /api/folder
func (c *FolderController) Create(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

	var req dto.CreateFolderRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(ctx, "参数错误: "+err.Error())
		return
	}

	result, err := c.folderService.Create(&req, ownerID)
	if err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}

	utils.Success(ctx, result)
}

// GetByBizID 根据业务ID获取文件夹信息
// GET /api/folder/by-bizid/:bizid
func (c *FolderController) GetByBizID(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)
	bizID := ctx.Param("bizid")
	if bizID == "" {
		utils.BadRequest(ctx, "业务ID不能为空")
		return
	}

	result, err := c.folderService.GetByBizID(bizID, ownerID)
	if err != nil {
		utils.NotFound(ctx, err.Error())
		return
	}

	utils.Success(ctx, result)
}

// ListChildren 获取文件夹子项(支持分页)
// GET /api/folder/:id/children?page=1&page_size=50
func (c *FolderController) ListChildren(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

	idStr := ctx.Param("id")
	var folderID uint64
	if idStr == "root" {
		folderID = 0
	} else {
		var err error
		folderID, err = strconv.ParseUint(idStr, 10, 64)
		if err != nil {
			utils.BadRequest(ctx, "无效的文件夹ID")
			return
		}
	}

	// 分页参数
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(ctx.DefaultQuery("page_size", "50"))
	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 200 {
		pageSize = 50
	}

	result, err := c.folderService.ListChildren(folderID, ownerID, page, pageSize)
	if err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}

	utils.Success(ctx, result)
}

// Rename 重命名文件夹
// PUT /api/folder/:id/rename
func (c *FolderController) Rename(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
	if err != nil {
		utils.BadRequest(ctx, "无效的文件夹ID")
		return
	}

	var req dto.RenameRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(ctx, "参数错误: "+err.Error())
		return
	}

	if err := c.folderService.Rename(id, req.NewName, ownerID, req.Version); err != nil {
		if strings.Contains(err.Error(), "已被其他人修改") {
			utils.Error(ctx, 409, 409, err.Error())
			return
		}
		utils.ServerError(ctx, err.Error())
		return
	}

	utils.SuccessWithMessage(ctx, "重命名成功", nil)
}

// Delete 删除文件夹
// DELETE /api/folder/:id
func (c *FolderController) Delete(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
	if err != nil {
		utils.BadRequest(ctx, "无效的文件夹ID")
		return
	}

	if err := c.folderService.Delete(id, ownerID); err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}

	utils.SuccessWithMessage(ctx, "已移入回收站", nil)
}