package controller

import (
	"net/http"
	"strconv"

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

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

// ShareController 分享控制器
type ShareController struct {
	shareService *service.ShareService
	fileService  *service.FileService
}

// NewShareController 创建分享控制器实例
func NewShareController() *ShareController {
	return &ShareController{
		shareService: service.NewShareService(),
		fileService:  service.NewFileService(),
	}
}

// Create 创建分享
// POST /api/share
func (c *ShareController) Create(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

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

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

	utils.Success(ctx, result)
}

// ListMyShares 查看我的分享
// GET /api/share
func (c *ShareController) ListMyShares(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

	results, err := c.shareService.ListByOwner(ownerID)
	if err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}

	utils.Success(ctx, results)
}

// Cancel 取消分享
// DELETE /api/share/:id
func (c *ShareController) Cancel(ctx *gin.Context) {
	ownerID := middleware.GetCurrentUserID(ctx)

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

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

	utils.SuccessWithMessage(ctx, "已取消分享", nil)
}

// GetShareInfo 获取分享信息(公开)
// GET /api/s/:code
func (c *ShareController) GetShareInfo(ctx *gin.Context) {
	code := ctx.Param("code")

	fileInfo, share, err := c.shareService.GetByCode(code)
	if err != nil {
		utils.NotFound(ctx, err.Error())
		return
	}

	utils.Success(ctx, gin.H{
		"file":         fileInfo,
		"has_password": share.Password != "",
		"expire_at":    share.ExpireAt,
	})
}

// VerifySharePassword 验证分享密码
// POST /api/s/:code/verify
func (c *ShareController) VerifySharePassword(ctx *gin.Context) {
	code := ctx.Param("code")

	var req dto.ShareVerifyRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(ctx, "请输入密码")
		return
	}

	_, share, err := c.shareService.GetByCode(code)
	if err != nil {
		utils.NotFound(ctx, err.Error())
		return
	}

	if !c.shareService.VerifyPassword(share.ID, req.Password) {
		utils.Unauthorized(ctx, "密码错误")
		return
	}

	utils.Success(ctx, gin.H{"verified": true})
}

// DownloadShareFile 下载分享文件
// GET /api/s/:code/download
func (c *ShareController) DownloadShareFile(ctx *gin.Context) {
	code := ctx.Param("code")

	_, share, err := c.shareService.GetByCode(code)
	if err != nil {
		utils.NotFound(ctx, err.Error())
		return
	}

	// 检查下载权限
	if share.AllowDownload != 1 {
		utils.Forbidden(ctx, "此分享不允许下载")
		return
	}

	// 验证密码
	if share.Password != "" {
		password := ctx.Query("password")
		if !c.shareService.VerifyPassword(share.ID, password) {
			utils.Unauthorized(ctx, "需要密码")
			return
		}
	}

	reader, file, err := c.fileService.DownloadByFileID(share.FileID)
	if err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}
	defer reader.Close()

	ctx.Header("Content-Disposition", "attachment; filename=\""+file.Name+"\"")
	ctx.Header("Content-Type", file.MimeType)
	ctx.DataFromReader(http.StatusOK, file.Size, file.MimeType, reader, nil)
}

// PreviewShareFile 预览分享文件(内联展示)
// GET /api/s/:code/preview
func (c *ShareController) PreviewShareFile(ctx *gin.Context) {
	code := ctx.Param("code")

	_, share, err := c.shareService.GetByCode(code)
	if err != nil {
		utils.NotFound(ctx, err.Error())
		return
	}

	// 检查预览权限
	if share.AllowPreview != 1 {
		utils.Forbidden(ctx, "此分享不允许预览")
		return
	}

	// 验证密码
	if share.Password != "" {
		password := ctx.Query("password")
		if !c.shareService.VerifyPassword(share.ID, password) {
			utils.Unauthorized(ctx, "需要密码")
			return
		}
	}

	reader, file, err := c.fileService.DownloadByFileID(share.FileID)
	if err != nil {
		utils.ServerError(ctx, err.Error())
		return
	}
	defer reader.Close()

	// 内联展示
	ctx.Header("Content-Disposition", "inline; filename=\""+file.Name+"\"")
	ctx.Header("Content-Type", file.MimeType)
	ctx.Header("Content-Length", strconv.FormatInt(file.Size, 10))
	ctx.DataFromReader(http.StatusOK, file.Size, file.MimeType, reader, nil)
}