// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package repo

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/storage"
	"code.gitea.io/gitea/modules/upload"

	gouuid "github.com/satori/go.uuid"
)

func RenderAttachmentSettings(ctx *context.Context) {
	renderAttachmentSettings(ctx)
}

func renderAttachmentSettings(ctx *context.Context) {
	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
	ctx.Data["AttachmentStoreType"] = setting.Attachment.StoreType
	ctx.Data["AttachmentAllowedTypes"] = setting.Attachment.AllowedTypes
	ctx.Data["AttachmentMaxSize"] = setting.Attachment.MaxSize
	ctx.Data["AttachmentMaxFiles"] = setting.Attachment.MaxFiles
}

// UploadAttachment response for uploading issue's attachment
func UploadAttachment(ctx *context.Context) {
	if !setting.Attachment.Enabled {
		ctx.Error(404, "attachment is not enabled")
		return
	}

	file, header, err := ctx.Req.FormFile("file")
	if err != nil {
		ctx.Error(500, fmt.Sprintf("FormFile: %v", err))
		return
	}
	defer file.Close()

	buf := make([]byte, 1024)
	n, _ := file.Read(buf)
	if n > 0 {
		buf = buf[:n]
	}

	err = upload.VerifyAllowedContentType(buf, strings.Split(setting.Attachment.AllowedTypes, ","))
	if err != nil {
		ctx.Error(400, err.Error())
		return
	}

	datasetID, _ := strconv.ParseInt(ctx.Req.FormValue("dataset_id"), 10, 64)

	attach, err := models.NewAttachment(&models.Attachment{
		IsPrivate:  true,
		UploaderID: ctx.User.ID,
		Name:       header.Filename,
		DatasetID:  datasetID,
	}, buf, file)
	if err != nil {
		ctx.Error(500, fmt.Sprintf("NewAttachment: %v", err))
		return
	}

	log.Trace("New attachment uploaded: %s", attach.UUID)
	ctx.JSON(200, map[string]string{
		"uuid": attach.UUID,
	})
}

func UpdatePublicAttachment(ctx *context.Context) {
	file := ctx.Query("file")
	isPrivate, _ := strconv.ParseBool(ctx.Query("is_private"))
	attach, err := models.GetAttachmentByUUID(file)
	if err != nil {
		ctx.Error(404, err.Error())
		return
	}
	attach.IsPrivate = isPrivate
	models.UpdateAttachment(attach)
}

// DeleteAttachment response for deleting issue's attachment
func DeleteAttachment(ctx *context.Context) {
	file := ctx.Query("file")
	attach, err := models.GetAttachmentByUUID(file)
	if err != nil {
		ctx.Error(400, err.Error())
		return
	}
	if !ctx.IsSigned || (ctx.User.ID != attach.UploaderID) {
		ctx.Error(403)
		return
	}
	err = models.DeleteAttachment(attach, true)
	if err != nil {
		ctx.Error(500, fmt.Sprintf("DeleteAttachment: %v", err))
		return
	}
	ctx.JSON(200, map[string]string{
		"uuid": attach.UUID,
	})
}

// GetAttachment serve attachements
func GetAttachment(ctx *context.Context) {
	attach, err := models.GetAttachmentByUUID(ctx.Params(":uuid"))
	if err != nil {
		if models.IsErrAttachmentNotExist(err) {
			ctx.Error(404)
		} else {
			ctx.ServerError("GetAttachmentByUUID", err)
		}
		return
	}

	repository, unitType, err := attach.LinkedRepository()
	if err != nil {
		ctx.ServerError("LinkedRepository", err)
		return
	}

	if repository == nil { //If not linked
		if !(ctx.IsSigned && attach.UploaderID == ctx.User.ID) { //We block if not the uploader
			ctx.Error(http.StatusNotFound)
			return
		}
	} else { //If we have the repository we check access
		perm, err := models.GetUserRepoPermission(repository, ctx.User)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "GetUserRepoPermission", err.Error())
			return
		}
		if !perm.CanRead(unitType) {
			ctx.Error(http.StatusNotFound)
			return
		}
	}

	dataSet, err := attach.LinkedDataSet()
	if err != nil {
		ctx.ServerError("LinkedDataSet", err)
		return
	}

	if dataSet != nil {
		isPermit, err := models.GetUserDataSetPermission(dataSet, ctx.User)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "GetUserDataSetPermission", err.Error())
			return
		}
		if !isPermit {
			ctx.Error(http.StatusNotFound)
			return
		}
	}

	//If we have matched and access to release or issue
	if setting.Attachment.StoreType == storage.MinioStorageType {
		url, err := storage.Attachments.PresignedGetURL(attach.RelativePath(), attach.Name)
		if err != nil {
			ctx.ServerError("PresignedGetURL", err)
			return
		}

		if err = increaseDownloadCount(attach, dataSet); err != nil {
			ctx.ServerError("Update", err)
			return
		}

		http.Redirect(ctx.Resp, ctx.Req.Request, url, http.StatusMovedPermanently)

	} else {
		fr, err := storage.Attachments.Open(attach.RelativePath())
		if err != nil {
			ctx.ServerError("Open", err)
			return
		}
		defer fr.Close()

		if err = increaseDownloadCount(attach, dataSet); err != nil {
			ctx.ServerError("Update", err)
			return
		}
		if err = ServeData(ctx, attach.Name, fr); err != nil {
			ctx.ServerError("ServeData", err)
			return
		}
	}

}

func increaseDownloadCount(attach *models.Attachment, dataSet *models.Dataset) error {
	if err := attach.IncreaseDownloadCount(); err != nil {
		return err
	}

	if dataSet != nil {
		if err := models.IncreaseDownloadCount(dataSet.ID); err != nil {
			return err
		}
	}

	return nil
}

// Get a presigned url for put object
func GetPresignedPutObjectURL(ctx *context.Context) {
	if !setting.Attachment.Enabled {
		ctx.Error(404, "attachment is not enabled")
		return
	}

	err := upload.VerifyFileType(ctx.Params("file_type"), strings.Split(setting.Attachment.AllowedTypes, ","))
	if err != nil {
		ctx.Error(400, err.Error())
		return
	}

	if setting.Attachment.StoreType == storage.MinioStorageType {
		uuid := gouuid.NewV4().String()
		url, err := storage.Attachments.PresignedPutURL(models.AttachmentRelativePath(uuid))
		if err != nil {
			ctx.ServerError("PresignedPutURL", err)
			return
		}

		ctx.JSON(200, map[string]string{
			"uuid": uuid,
			"url":  url,
		})
	} else {
		ctx.Error(404, "storage type is not enabled")
		return
	}
}

// AddAttachment response for add attachment record
func AddAttachment(ctx *context.Context) {
	uuid := ctx.Query("uuid")
	has, err := storage.Attachments.HasObject(models.AttachmentRelativePath(uuid))
	if err != nil {
		ctx.ServerError("HasObject", err)
		return
	}

	if !has {
		ctx.Error(404, "attachment has not been uploaded")
		return
	}

	_, err = models.InsertAttachment(&models.Attachment{
		UUID:       uuid,
		UploaderID: ctx.User.ID,
		IsPrivate:  true,
		Name:       ctx.Query("file_name"),
		Size:       ctx.QueryInt64("size"),
		DatasetID:  ctx.QueryInt64("dataset_id"),
	})

	if err != nil {
		ctx.Error(500, fmt.Sprintf("InsertAttachment: %v", err))
		return
	}

	ctx.JSON(200, map[string]string{
		"result_code": "0",
	})
}

func NewMultipart(ctx *context.Context) {
	if !setting.Attachment.Enabled {
		ctx.Error(404, "attachment is not enabled")
		return
	}

	err := upload.VerifyFileType(ctx.Params("file_type"), strings.Split(setting.Attachment.AllowedTypes, ","))
	if err != nil {
		ctx.Error(400, err.Error())
		return
	}

	if setting.Attachment.StoreType == storage.MinioStorageType {
		uuid := gouuid.NewV4().String()
		url, err := storage.NewMultiPartUpload(uuid)
		if err != nil {
			ctx.ServerError("NewMultipart", err)
			return
		}

		ctx.JSON(200, map[string]string{
			"uuid": uuid,
			"url":  url,
		})
	} else {
		ctx.Error(404, "storage type is not enabled")
		return
	}
}


func CompleteMultipart(ctx *context.Context) {
	uuid := ctx.Query("uuid")
	uploadID := ctx.Query("uploadID")
	completedParts := ctx.Query("completedParts")

	_, err := storage.CompleteMultiPartUpload(uuid, uploadID, completedParts)
	if err != nil {
		ctx.Error(500, fmt.Sprintf("CompleteMultiPartUpload failed: %v", err))
		return
	}

	_, err = models.InsertAttachment(&models.Attachment{
		UUID:       uuid,
		UploaderID: ctx.User.ID,
		IsPrivate:  true,
		Name:       ctx.Query("file_name"),
		Size:       ctx.QueryInt64("size"),
		DatasetID:  ctx.QueryInt64("dataset_id"),
	})

	if err != nil {
		ctx.Error(500, fmt.Sprintf("InsertAttachment: %v", err))
		return
	}

	ctx.JSON(200, map[string]string{
		"result_code": "0",
	})
}