package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"local/args"
	"local/oauth2"
	"local/storage"
	"log"
	"net/http"
	"strings"
)

type Uploader int

const (
	UploaderTodo = Uploader(iota)
	UploaderLedger
)

var uploaders = map[string]Uploader{
	"todo":   UploaderTodo,
	"ledger": UploaderLedger,
}

type Config struct {
	EmailUser           string
	EmailPass           string
	EmailIMAP           string
	TodoAddr            string
	TodoToken           string
	TodoList            string
	TodoTag             string
	Uploader            Uploader
	Storage             storage.DB
	Banks               map[Bank]bool
	AccountsPattern     string
	AccountsAntiPattern string
}

var config Config

func NewConfig() Config {
	as := args.NewArgSet()

	as.Append(args.STRING, "emailuser", "email username", "breellocaldev@gmail.com")
	as.Append(args.STRING, "emailpass", "email password", "diblloewfncwssof")
	as.Append(args.STRING, "emailimap", "email imap", "imap.gmail.com:993")

	as.Append(args.STRING, "uploader", "todo, ledger", "todo")

	as.Append(args.STRING, "todoaddr", "todo addr", "https://todo-server.remote.blapointe.com")
	as.Append(args.STRING, "todopass", "todo pass", "gJtEXbbLHLf54yS9EdujtVN2n6Y")
	as.Append(args.STRING, "todotoken", "todo token", "")
	as.Append(args.STRING, "todolist", "todo list", "")
	as.Append(args.STRING, "todotag", "todo tag", "expense")

	as.Append(args.STRING, "banks", "uccu,citi,chase,bankofamerica", "uccu,citi,chase,bankofamerica")
	as.Append(args.STRING, "accounts", "regex to include filter accounts", ".*")
	as.Append(args.STRING, "not-accounts", "regex to exclude filter accounts", "zzzzzz")

	as.Append(args.STRING, "authaddr", "auth addr", "https://auth.remote.blapointe.com")
	as.Append(args.STRING, "store", "store type", "map")
	as.Append(args.STRING, "storeaddr", "store addr", "/tmp/store")
	as.Append(args.STRING, "storeuser", "store user", "")
	as.Append(args.STRING, "storepass", "store pass", "")

	if err := as.Parse(); err != nil {
		panic(err)
	}

	uploader := as.GetString("uploader")
	ul, ok := uploaders[uploader]
	if !ok {
		panic("invalid uploader: " + uploader)
	}

	storage, err := storage.New(storage.TypeFromString(as.GetString("store")), as.GetString("storeaddr"), as.GetString("storeuser"), as.GetString("storepass"))
	if err != nil {
		panic(err)
	}

	config = Config{
		EmailUser:           as.GetString("emailuser"),
		EmailPass:           as.GetString("emailpass"),
		EmailIMAP:           as.GetString("emailimap"),
		TodoAddr:            as.GetString("todoaddr"),
		TodoTag:             as.GetString("todotag"),
		AccountsPattern:     as.GetString("accounts"),
		AccountsAntiPattern: as.GetString("not-accounts"),
		Storage:             storage,
		Uploader:            ul,
		Banks: map[Bank]bool{
			BankOfAmerica: strings.Contains(strings.ToLower(as.GetString("banks")), strings.ToLower(BankOfAmerica.String())),
			Chase:         strings.Contains(strings.ToLower(as.GetString("banks")), strings.ToLower(Chase.String())),
			Citi:          strings.Contains(strings.ToLower(as.GetString("banks")), strings.ToLower(Citi.String())),
			UCCU:          strings.Contains(strings.ToLower(as.GetString("banks")), strings.ToLower(UCCU.String())),
		},
	}
	log.Printf("config: %+v", config)

	if config.Uploader == UploaderTodo {
		token := as.GetString("todotoken")
		if len(token) == 0 {
			token = getToken(as)
		}

		list := as.GetString("todolist")
		if len(list) == 0 {
			list = getList(as, token)
		}
		config.TodoToken = token
		config.TodoList = list
	}

	return config
}

func getToken(as *args.ArgSet) string {
	c := &http.Client{CheckRedirect: func(r *http.Request, via []*http.Request) error {
		return http.ErrUseLastResponse
	}}
	body := "username=" + as.GetString("todopass")
	name := strings.Split(as.GetString("todoaddr"), ".")[0]
	name = strings.TrimPrefix(name, "http://")
	name = strings.TrimPrefix(name, "https://")
	req, err := http.NewRequest("POST", as.GetString("authaddr")+"/authorize/"+name+"?"+oauth2.REDIRECT+"=127.0.0.1", strings.NewReader(body))
	if err != nil {
		panic(err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	resp, err := c.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode > 399 {
		panic("bad status getting token: " + resp.Status)
	}
	cookie := resp.Header.Get("Set-Cookie")
	token := cookie[strings.Index(cookie, "=")+1:]
	token = strings.Split(token, "; ")[0]
	if len(token) == 0 {
		panic(fmt.Sprintf("no token found: (%v) %v", resp.StatusCode, resp.Header))
	}
	return token
}

func getList(as *args.ArgSet, token string) string {
	req, err := http.NewRequest("GET", as.GetString("todoaddr")+"/ajax.php?loadLists", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Cookie", oauth2.COOKIE+"="+token)
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()
	var r struct {
		List []struct {
			ID string `json:"id"`
		} `json:"list"`
	}
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	if err := json.Unmarshal(b, &r); err != nil {
		panic(fmt.Errorf("%v: %s", err, b))
	}
	if len(r.List) == 0 {
		panic("no lists found")
	}
	list := r.List[0].ID
	if len(list) == 0 {
		panic("empty list found")
	}
	return list
}