package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
	"time"

	"git.sr.ht/~michalr/go-satel"
	"gopkg.in/yaml.v3"
)

const (
	ConfigFilePath = "hswro-alarm-bot.yml"
)

type OwnDuration struct {
	duration time.Duration
}

type SatelChangeType struct {
	changeType satel.ChangeType
}

type MqttConfig struct {
	Enabled   bool   `yaml:"mqtt-enabled"`
	BrokerUri string `yaml:"mqtt-broker-uri"`
	Username  string `yaml:"mqtt-username"`
	Password  string `yaml:"mqtt-password"`
}

type AppConfig struct {
	SatelAddr          string            `yaml:"satel-addr"`
	ChatIds            []int64           `yaml:"tg-chat-ids"`
	AllowedTypes       []SatelChangeType `yaml:"allowed-types"`
	AllowedIndexes     []int             `yaml:"allowed-indexes"`
	PoolInterval       OwnDuration       `yaml:"pool-interval"`
	ArmCallbackUrls    []string          `yaml:"arm-callback-urls"`
	DisarmCallbackUrls []string          `yaml:"disarm-callback-urls"`
	AlarmCallbackUrls  []string          `yaml:"alarm-callback-urls"`
	WriteMemoryProfile bool              `yaml:"write-memory-profile"`
	MqttConfiguration  MqttConfig        `yaml:"mqtt"`
}

func (m *SatelChangeType) UnmarshalYAML(unmarshal func(interface{}) error) error {
	var inputStr string
	err := unmarshal(&inputStr)
	if err != nil {
		return err
	}
	ct, err := StringToSatelChangeType(inputStr)
	if err != nil {
		return err
	}
	*m = SatelChangeType{ct}
	return nil
}

func (m *OwnDuration) UnmarshalYAML(unmarshal func(interface{}) error) error {
	var inputStr string
	err := unmarshal(&inputStr)
	if err != nil {
		return err
	}
	duration, err := time.ParseDuration(inputStr)
	if err != nil {
		return err
	}
	*m = OwnDuration{duration}
	return nil
}

func (self SatelChangeType) GetChangeType() satel.ChangeType { return self.changeType }
func (self OwnDuration) GetDuration() time.Duration          { return self.duration }

func loadConfigFromFile(filePath string, logger *log.Logger) AppConfig {
	f, err := os.ReadFile(filePath)
	if err != nil {
		logger.Print("Error opening config file: ", err, ". Trying to continue without it")
		return AppConfig{}
	}
	return parseConfigFromFile(f, logger)
}

func parseConfigFromFile(contents []byte, logger *log.Logger) AppConfig {
	var config AppConfig
	err := yaml.Unmarshal(contents, &config)
	if err != nil {
		logger.Print("Error while parsing config file: ", err, ". Trying to continue without it")
		return AppConfig{}
	}
	return config
}

func getCmdLineParams(config *AppConfig, logger *log.Logger) {
	satelApiAddr := flag.String("satel-addr", "", "Address that should be used to connect to the SATEL device")
	satelApiPort := flag.String("satel-port", "7094", "Port that should be used to connect to the SATEL device")
	chatIdRaw := flag.String("tg-chat-id", "", "Telegram Chat ID where to send updates. Use \",\" to specify multiple IDs.")
	allowedTypesRaw := flag.String("allowed-types", "", "Satel change types that are allowed. All other types will be discarded. By default all are allowed. Use \",\" to specify multiple types.")
	allowedIndexesRaw := flag.String("allowed-indexes", "", "Satel indexes (zones?) that are allowed. All other indexes will be discarded. By default all are allowed. Use \",\" to specify multiple indexes.")
	satelPoolInterval := flag.Duration("pool-interval", 5*time.Second, "How often should the SATEL device be pooled for changes? Default: 5 seconds.")
	writeMemoryProfile := flag.Bool("write-memory-profile", false, "Whether application should dump its memory profile every 24 hours. Default: false")
	flag.Parse()

	if len(*satelApiAddr) == 0 || len(*satelApiPort) == 0 || len(*chatIdRaw) == 0 {
		logger.Fatal("Use --satel-addr=ADDR, --satel-port=PORT and --tg-chat-id=CHAT_ID command line flags to continue.")
	}
	chatIdsStrings := strings.Split(*chatIdRaw, ",")
	var chatIds []int64
	for _, chatIdStr := range chatIdsStrings {
		chatId, err := strconv.ParseInt(chatIdStr, 10, 64)
		if err != nil {
			logger.Fatalf("Tried to use a non-int value for one of tg_chatIds: %s. That's bad.", chatIdStr)
		}
		chatIds = append(chatIds, chatId)
	}
	allowedTypesStrings := strings.Split(*allowedTypesRaw, ",")
	var allowedTypes []SatelChangeType
	for _, allowedTypeStr := range allowedTypesStrings {
		if len(allowedTypeStr) == 0 {
			continue
		}
		allowedType, err := StringToSatelChangeType(allowedTypeStr)
		if err != nil {
			logger.Fatalf("Error trying to understand an allowed type: %s.", err)
		}
		allowedTypes = append(allowedTypes, SatelChangeType{allowedType})
	}
	allowedIndexesStrings := strings.Split(*allowedIndexesRaw, ",")
	var allowedIndexes []int
	for _, allowedIndexStr := range allowedIndexesStrings {
		if len(allowedIndexStr) == 0 {
			continue
		}
		allowedIndex, err := strconv.ParseInt(allowedIndexStr, 10, 0)
		if err != nil {
			logger.Fatalf("Tried to use a non-int value for one of allowed indexes: %s. That's bad.", allowedIndexStr)
		}
		allowedIndexes = append(allowedIndexes, int(allowedIndex))
	}
	if writeMemoryProfile != nil {
		config.WriteMemoryProfile = *writeMemoryProfile
	}

	satelAddr := fmt.Sprintf("%s:%s", *satelApiAddr, *satelApiPort)

	config.SatelAddr = satelAddr
	config.ChatIds = chatIds
	config.AllowedTypes = allowedTypes
	config.AllowedIndexes = allowedIndexes
	config.PoolInterval = OwnDuration{*satelPoolInterval}
}

func MakeConfig(logger *log.Logger) AppConfig {
	config := loadConfigFromFile(ConfigFilePath, logger)
	config.ArmCallbackUrls = []string{}
	config.DisarmCallbackUrls = []string{}
	config.AlarmCallbackUrls = []string{}
	config.WriteMemoryProfile = false

	if len(os.Getenv("NOTIFY_URL_ARM")) != 0 {
		config.ArmCallbackUrls = append(config.ArmCallbackUrls, os.Getenv("NOTIFY_URL_ARM"))
	}
	if len(os.Getenv("NOTIFY_URL_DISARM")) != 0 {
		config.DisarmCallbackUrls = append(config.DisarmCallbackUrls, os.Getenv("NOTIFY_URL_DISARM"))
	}
	if len(os.Getenv("ALARM_URL_ARM")) != 0 {
		config.AlarmCallbackUrls = append(config.AlarmCallbackUrls, os.Getenv("ALARM_URL_ARM"))
	}

	getCmdLineParams(&config, logger)
	return config
}