package main

import (
	"code.google.com/p/weed-fs/go/operation"
	"code.google.com/p/weed-fs/go/util"
	"encoding/json"
	"errors"
	"fmt"
	"net/url"
	"os"
	"path"
	"path/filepath"
	"strconv"
)

var (
	uploadReplication *string
	uploadDir         *string
	include           *string
)

func init() {
	cmdUpload.Run = runUpload // break init cycle
	cmdUpload.IsDebug = cmdUpload.Flag.Bool("debug", false, "verbose debug information")
	server = cmdUpload.Flag.String("server", "localhost:9333", "weedfs master location")
	uploadDir = cmdUpload.Flag.String("dir", "", "Upload the whole folder recursively if specified.")
	include = cmdUpload.Flag.String("include", "", "pattens of files to upload, e.g., *.pdf, *.html, ab?d.txt, works together with -dir")
	uploadReplication = cmdUpload.Flag.String("replication", "000", "replication type(000,001,010,100,110,200)")
}

var cmdUpload = &Command{
	UsageLine: "upload -server=localhost:9333 file1 [file2 file3]\n upload -server=localhost:9333 -dir=one_directory",
	Short:     "upload one or a list of files",
	Long: `upload one or a list of files, or batch upload one whole folder recursively.
  It uses consecutive file keys for the list of files.
  e.g. If the file1 uses key k, file2 can be read via k_1

  `,
}

type AssignResult struct {
	Fid       string `json:"fid"`
	Url       string `json:"url"`
	PublicUrl string `json:"publicUrl"`
	Count     int
	Error     string `json:"error"`
}

func assign(count int) (*AssignResult, error) {
	values := make(url.Values)
	values.Add("count", strconv.Itoa(count))
	values.Add("replication", *uploadReplication)
	jsonBlob, err := util.Post("http://"+*server+"/dir/assign", values)
	debug("assign result :", string(jsonBlob))
	if err != nil {
		return nil, err
	}
	var ret AssignResult
	err = json.Unmarshal(jsonBlob, &ret)
	if err != nil {
		return nil, err
	}
	if ret.Count <= 0 {
		return nil, errors.New(ret.Error)
	}
	return &ret, nil
}

func upload(filename string, server string, fid string) (int, error) {
	debug("Start uploading file:", filename)
	fh, err := os.Open(filename)
	if err != nil {
		debug("Failed to open file:", filename)
		return 0, err
	}
	fi, fiErr := fh.Stat()
	if fiErr != nil {
		debug("Failed to stat file:", filename)
		return 0, fiErr
	}
	ret, e := operation.Upload("http://"+server+"/"+fid+"?ts="+strconv.Itoa(int(fi.ModTime().Unix())), path.Base(filename), fh)
	if e != nil {
		return 0, e
	}
	return ret.Size, e
}

type SubmitResult struct {
	FileName string `json:"fileName"`
	FileUrl  string `json:"fileUrl"`
	Fid      string `json:"fid"`
	Size     int    `json:"size"`
	Error    string `json:"error"`
}

func submit(files []string) ([]SubmitResult, error) {
	results := make([]SubmitResult, len(files))
	for index, file := range files {
		results[index].FileName = file
	}
	ret, err := assign(len(files))
	if err != nil {
		for index, _ := range files {
			results[index].Error = err.Error()
		}
		return results, err
	}
	for index, file := range files {
		fid := ret.Fid
		if index > 0 {
			fid = fid + "_" + strconv.Itoa(index)
		}
		results[index].Size, err = upload(file, ret.PublicUrl, fid)
		if err != nil {
			fid = ""
			results[index].Error = err.Error()
		}
		results[index].Fid = fid
		results[index].FileUrl = ret.PublicUrl + "/" + fid
	}
	return results, nil
}

func runUpload(cmd *Command, args []string) bool {
	if len(cmdUpload.Flag.Args()) == 0 {
		if *uploadDir == "" {
			return false
		}
		filepath.Walk(*uploadDir, func(path string, info os.FileInfo, err error) error {
			if err == nil {
				if !info.IsDir() {
					if *include != "" {
						if ok, _ := filepath.Match(*include, filepath.Base(path)); !ok {
							return nil
						}
					}
					results, e := submit([]string{path})
					bytes, _ := json.Marshal(results)
					fmt.Println(string(bytes))
					if e != nil {
						return e
					}
				}
			} else {
				fmt.Println(err)
			}
			return err
		})
	} else {
		results, _ := submit(args)
		bytes, _ := json.Marshal(results)
		fmt.Println(string(bytes))
	}
	return true
}