package db

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"
)

var localDB []Token

type Token struct {
	Token       string `json:"token"`
	DedupObject string `json:"dedup_object"`
}

func InitLocalDB() {
start:
	data, err := os.ReadFile("./token.json")
	if os.IsNotExist(err) {
		os.WriteFile("./token.json", []byte("[]"), 0644)
		goto start
	} else if err != nil {
		fmt.Println(err)
	}

	err = json.Unmarshal(data, &localDB)
	if err != nil {
		fmt.Println(err)
	}
}

func ListToken() []Token {
	InitLocalDB()
	return localDB
}

func CreateToken(token string, dedupObject string) error {
	InitLocalDB()
	for _, t := range localDB {
		if t.Token == token {
			return errors.New("token已经存在")
		}
	}

	a := append(localDB, Token{token, dedupObject})
	marshal, err := json.Marshal(a)
	if err != nil {
		return err
	}
	if err := os.WriteFile("./token.json", marshal, 0644); err != nil {
		return err
	}
	InitLocalDB()
	return nil
}

func UpdateToken(token string, dedupObject string) error {
	InitLocalDB()

	for i, t := range localDB {
		if t.Token == token {
			localDB[i].DedupObject = dedupObject

			marshal, err := json.Marshal(localDB)
			if err != nil {
				return err
			}
			if err := os.WriteFile("./token.json", marshal, 0644); err != nil {
				return err
			}
			return nil
		}
	}
	InitLocalDB()
	return errors.New("token not found")
}

func DeleteToken(token string) error {
	InitLocalDB()

	for i, t := range localDB {
		if t.Token == token {
			localDB = append(localDB[:i], localDB[i+1:]...)

			marshal, err := json.Marshal(localDB)
			if err != nil {
				return err
			}
			if err := os.WriteFile("./token.json", marshal, 0644); err != nil {
				return err
			}
			return nil
		}
	}
	InitLocalDB()
	return errors.New("token not found")
}

func GetDedupObject(token string) (dedupObject string, err error) {
	for i, t := range localDB {
		if t.Token == token {
			return localDB[i].DedupObject, nil
		}
	}
	return "", errors.New("未找到Token")
}