package repo

import (
	"encoding/json"
	"errors"
	"io/ioutil"
	"net/http"
	"strings"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
)

const (
	tplDirIndex base.TplName = "repo/datasets/dirs/index"
)

type FileInfo struct {
	FileName string `json:"FileName"`
	ModTime  string `json:"ModTime"`
	IsDir    bool   `json:"IsDir"`
	Size     int64  `json:"Size"`
	ParenDir string `json:"ParenDir"`
	UUID     string `json:"UUID"`
}

type RespGetDirs struct {
	ResultCode string `json:"resultCode"`
	FileInfos  string `json:"fileInfos"`
}

func DirIndex(ctx *context.Context) {
	uuid := ctx.Params("uuid")
	parentDir := ctx.Query("parentDir")
	dirArray := strings.Split(parentDir, "/")

	attachment, err := models.GetAttachmentByUUID(uuid)
	if err != nil {
		ctx.ServerError("GetDatasetAttachments", err)
		return
	}

	if !strings.HasSuffix(attachment.Name, ".zip") {
		log.Error("The file is not zip file, can not query the dir")
		ctx.ServerError("The file is not zip file, can not query the dir", errors.New("The file is not zip file, can not query the dir"))
		return
	} else if attachment.DecompressState != models.DecompressStateDone {
		log.Error("The file has not been decompressed completely now")
		ctx.ServerError("The file has not been decompressed completely now", errors.New("The file has not been decompressed completely now"))
		return
	}

	dirArray = append([]string{attachment.Name}, dirArray...)
	if parentDir == "" {
		dirArray = []string{attachment.Name}
	}

	dirs, err := getDirs(uuid, parentDir)
	if err != nil {
		log.Error("getDirs failed:", err.Error())
		ctx.ServerError("getDirs failed:", err)
		return
	}

	var fileInfos []FileInfo
	err = json.Unmarshal([]byte(dirs), &fileInfos)
	if err != nil {
		log.Error("json.Unmarshal failed:", err.Error())
		ctx.ServerError("json.Unmarshal failed:", err)
		return
	}

	ctx.Data["Path"] = dirArray
	ctx.Data["Dirs"] = fileInfos
	ctx.Data["PageIsDataset"] = true

	ctx.HTML(200, tplDirIndex)
}

func getDirs(uuid string, parentDir string) (string, error) {
	var dirs string
	var req string
	if parentDir == "" {
		req = "uuid=" + uuid
	} else {
		req = "uuid=" + uuid + "&parentDir=" + parentDir
	}

	url := setting.DecompressAddress + "/dirs?" + req
	reqHttp, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		log.Error("http.NewRequest failed:", err.Error())
		return dirs, err
	}

	reqHttp.SetBasicAuth(setting.AuthUser, setting.AuthPassword)
	res, err := http.DefaultClient.Do(reqHttp)
	if err != nil {
		log.Error("send http to decompress failed:", err.Error())
		return dirs, err
	}

	if res.StatusCode != http.StatusOK {
		log.Error("the response from decompress is failed")
		return dirs, errors.New("the response from decompress is failed")
	}

	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		log.Error("read resp body failed:", err.Error())
		return dirs, err
	}

	var resp RespGetDirs
	err = json.Unmarshal(body, &resp)
	if err != nil {
		log.Error("unmarshal resp failed:", err.Error())
		return dirs, err
	}

	if resp.ResultCode != "0" {
		log.Error("GetDirs failed:", resp.ResultCode)
		return dirs, errors.New("GetDirs failed")
	}

	dirs = resp.FileInfos

	return dirs, nil
}