package storage

import (
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"

	"git.sp4ke.com/sp4ke/bit4sat/db"
	"git.sp4ke.com/sp4ke/bit4sat/utils"
	"github.com/gin-gonic/gin"
	"github.com/segmentio/ksuid"
)

type UploadCtrl struct{}

func (ctrl UploadCtrl) New(c *gin.Context) {
	uploadForm := UploadForm{}

	if err := c.ShouldBindJSON(&uploadForm); err != nil {
		utils.JSONErr(c, http.StatusNotAcceptable,
			"could not parse form")
		return
	}

	// Create unique id
	id := ksuid.New()

	tx, err := db.DB.Sql.Beginx()
	if err != nil {
		utils.JSONErrPriv(c, http.StatusInternalServerError, err)
		return
	}

	for _, file := range uploadForm.Files {
		up := &Upload{}
		up.ID = id.String()

		log.Println(file.Name)
		up.FileName, up.FileExt = utils.CleanFileName(file.Name)

		up.FileSize = file.Size
		up.FileType = file.Type
		up.SHA256 = file.SHA256
		up.Status = UpNew

		err := up.TxWrite(tx)
		if err != nil {
			utils.JSONErrPriv(c, http.StatusInternalServerError, err)
			db.RollbackTx(tx, nil)
			return
		}
	}

	err = tx.Commit()
	if err != nil {
		utils.JSONErrPriv(c, http.StatusInternalServerError, err)
		return
	}

	log.Println("new upload created")
	c.JSON(http.StatusOK, gin.H{
		"status": http.StatusOK,
		"result": gin.H{
			"id": id,
		},
	})
}

func (ctrl UploadCtrl) Upload(c *gin.Context) {

	// Check that upload ID exists
	id := c.Param("id")

	exists, err := IdExists(id)
	if err != nil {
		utils.JSONErrPriv(c, http.StatusInternalServerError, err)
		return
	}

	if !exists {
		utils.JSONErr(c, http.StatusNotFound, "id not found")
		return
	}

	form, err := c.MultipartForm()
	if err != nil {
		utils.JSONErr(c, http.StatusNotAcceptable,
			fmt.Sprintf("Could not parse form: %s", err.Error()))
		return
	}

	files := form.File["upload[]"]

	tx, err := db.DB.Sql.Beginx()
	if err != nil {
		utils.JSONErrPriv(c, http.StatusInternalServerError, err)
		return
	}

	for _, file := range files {
		log.Printf("Handling %s", file.Filename)

		// Get the file's sha256
		hasher := sha256.New()

		formFd, err := file.Open()
		defer formFd.Close()

		if err != nil {
			utils.JSONErr(
				c, http.StatusInternalServerError,
				fmt.Sprintf("Could not read file %s", file.Filename),
			)
			db.RollbackTx(tx, nil)
			return
		}

		_, err = io.Copy(hasher, formFd)
		if err != nil {
			utils.JSONErr(c, http.StatusInternalServerError,
				"")
			db.RollbackTx(tx, nil)
			return
		}

		sum256 := hex.EncodeToString(hasher.Sum(nil))

		// Get the file's metadata from upload table
		up, err := GetByHashID(sum256, id)
		if err != nil {
			utils.JSONErrPriv(c, http.StatusNotFound, err)
			db.RollbackTx(tx, nil)
			return
		}

		log.Printf("Found received file's %s metadata in local database\n", up.FileName)
		//log.Println(up)

		// Store file
		if up.Status == UpStored {
			utils.JSONErr(c, http.StatusConflict,
				fmt.Sprintf("%s already uploaded", up.FileName))
			return
		}
		//
		//
		log.Println("Storing file")
		err = StoreFormFile(formFd, up.SHA256+up.FileExt)
		if err != nil {
			utils.JSONErrPriv(c, http.StatusInternalServerError, err)
			db.RollbackTx(tx, nil)
			return
		}

		log.Printf("%s stored at %s", up.FileName,
			GetStoreDestination(up.SHA256+up.FileExt))

		// Setting status to stored
		log.Println("Updating upload status to stored")
		up.Status = UpStored
		err = up.TxSetState(tx, UpStored)
		if err != nil {
			utils.JSONErrPriv(c, http.StatusInternalServerError, err)
			db.RollbackTx(tx, func() {
				err := os.Remove(GetStoreDestination(up.SHA256 + up.FileExt))
				if err != nil {
					log.Println(err)
				}
			})
			return
		}
	}

	err = tx.Commit()
	if err != nil {
		utils.JSONErrPriv(c, http.StatusInternalServerError, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"status": http.StatusOK,
		"result": fmt.Sprintf("%d files uploaded uploaded !", len(files)),
	})

}