package config

import (
	"encoding/json"
	"io/ioutil"
)

const NULL_BLOCK_NUMBER uint32 = 0xffffffff

type RedisConfig struct {
	Addr     string `json:"addr"`
	Password string `json:"password"`
	DB       int    `json:"db"`
	CacheID  string `json:"cache_id"`
	Prefix   string `json:"prefix"`
}

type TelegramConfig struct {
	Id      string `json:"id"`
	Channel int64  `json:"channel"`
}

type Config struct {
	Name    string `json:"name"`
	ShipApi string `json:"ship_api"`
	Api     string `json:"api"`

	Redis RedisConfig `json:"redis"`

	Telegram TelegramConfig `json:"telegram"`

	IrreversibleOnly    bool   `json:"irreversible_only"`
	MaxMessagesInFlight uint32 `json:"max_messages_in_flight"`
	StartBlockNum       uint32 `json:"start_block_num"`
	EndBlockNum         uint32 `json:"end_block_num"`
}

func Load(filename string) (Config, error) {
	cfg := Config{
		StartBlockNum:       NULL_BLOCK_NUMBER,
		EndBlockNum:         NULL_BLOCK_NUMBER,
		MaxMessagesInFlight: 10,
		IrreversibleOnly:    false,
		Redis: RedisConfig{
			Addr:     "localhost:6379",
			Password: "",
			DB:       0,
			Prefix:   "ship",
		},
	}

	bytes, err := ioutil.ReadFile(filename)
	if err != nil {
		return cfg, err
	}

	err = json.Unmarshal(bytes, &cfg)
	if err != nil {
		return cfg, err
	}

	return cfg, nil
}