package main

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"time"

	"github.com/bwmarrin/discordgo"
)

type BattleSchedudleSub struct {
	StartTime time.Time `json:"start_time"`
	EndTime   time.Time `json:"end_time"`
	Rule      struct {
		Key  string `json:"key"`
		Name string `json:"name"`
	} `json:"rule"`
	Stages []struct {
		ID    int    `json:"id"`
		Name  string `json:"name"`
		Image string `json:"image"`
	} `json:"stages"`
	IsFest bool `json:"is_fest"`
}

type BattleSchedule struct {
	Result struct {
		Regular          []BattleSchedudleSub `json:"regular"`
		BankaraChallenge []BattleSchedudleSub `json:"bankara_challenge"`
		BankaraOpen      []BattleSchedudleSub `json:"bankara_open"`
		X                []BattleSchedudleSub `json:"x"`
		Event            []struct {
			StartTime time.Time `json:"start_time"`
			EndTime   time.Time `json:"end_time"`
			Rule      struct {
				Key  string `json:"key"`
				Name string `json:"name"`
			} `json:"rule"`
			Stages []struct {
				ID    int    `json:"id"`
				Name  string `json:"name"`
				Image string `json:"image"`
			} `json:"stages"`
			Event struct {
				ID   string `json:"id"`
				Name string `json:"name"`
				Desc string `json:"desc"`
			} `json:"event"`
			IsFest bool `json:"is_fest"`
		} `json:"event"`
		Fest []struct {
			StartTime      time.Time `json:"start_time"`
			EndTime        time.Time `json:"end_time"`
			Rule           any       `json:"rule"`
			Stages         any       `json:"stages"`
			IsFest         bool      `json:"is_fest"`
			IsTricolor     bool      `json:"is_tricolor"`
			TricolorStages any       `json:"tricolor_stages"`
		} `json:"fest"`
		FestChallenge []struct {
			StartTime      time.Time `json:"start_time"`
			EndTime        time.Time `json:"end_time"`
			Rule           any       `json:"rule"`
			Stages         any       `json:"stages"`
			IsFest         bool      `json:"is_fest"`
			IsTricolor     bool      `json:"is_tricolor"`
			TricolorStages any       `json:"tricolor_stages"`
		} `json:"fest_challenge"`
	} `json:"result"`
}

type SalmonRunSchedule struct {
	Results []struct {
		StartTime time.Time `json:"start_time"`
		EndTime   time.Time `json:"end_time"`
		Boss      struct {
			ID   string `json:"id"`
			Name string `json:"name"`
		} `json:"boss"`
		Stage struct {
			ID    int    `json:"id"`
			Name  string `json:"name"`
			Image string `json:"image"`
		} `json:"stage"`
		Weapons []struct {
			Name  string `json:"name"`
			Image string `json:"image"`
		} `json:"weapons"`
		IsBigRun bool `json:"is_big_run"`
	} `json:"results"`
}

type msgidstore struct {
	filepath string
}

func NewMsgIDStore() *msgidstore {
	return &msgidstore{filepath: os.Getenv("MSGIDSTORE_FILEPATH")}
}

func (s *msgidstore) Set(id string) error {
	// Open file for writing
	file, err := os.OpenFile(s.filepath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return err
	}
	defer file.Close()
	// Write the message ID to the file
	_, err = file.WriteString(id)
	if err != nil {
		return err
	}
	return nil
}

func (s *msgidstore) Exist() bool {
	// Check if the file exists
	_, err := os.Stat(s.filepath)
	if os.IsNotExist(err) {
		return false
	}
	return err == nil
}

func (s *msgidstore) Get() (string, error) {
	// Open file for reading
	file, err := os.Open(s.filepath)
	if err != nil {
		return "", err
	}
	defer file.Close()
	// Read the message ID from the file
	var id string
	_, err = fmt.Fscanf(file, "%s", &id)
	if err != nil {
		return "", err
	}
	return id, nil
}

func battleScheduleSub(schedSub []BattleSchedudleSub) string {
	var output string
	for _, v := range schedSub {
		output += fmt.Sprintf("%d/%d %2d:%02d- ", v.StartTime.Month(), v.StartTime.Day(), v.StartTime.Hour(), v.StartTime.Minute())
		output += v.Rule.Name
		/*
			length := utf8.RuneCountInString(v.Rule.Name)
			fill := (13 - length)
			for range fill {
				output += "　"
			}
			for _, stage := range v.Stages {
				output += fmt.Sprintf("%s ", stage.Name)
				length := utf8.RuneCountInString(stage.Name)
				fill := (11 - length)
				for range fill {
					output += "　"
				}
			}
		*/
		output += fmt.Sprintln()
	}
	if output == "" {
		output = "現在、スケジュールはありません。\n"
	}
	return output
}

func battleSchedule() string {
	url := "https://spla3.yuu26.com/api/schedule"

	resp, err := http.Get(url)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	byteArray, _ := io.ReadAll(resp.Body)
	var data BattleSchedule
	err = json.Unmarshal(byteArray, &data)
	if err != nil {
		panic(err)
	}

	output := "バンカラオープン スケジュール\n"
	output += "```\n"
	output += battleScheduleSub(data.Result.BankaraOpen)
	output += "```\n"

	output += "バンカラチャレンジ スケジュール\n"
	output += "```\n"
	output += battleScheduleSub(data.Result.BankaraChallenge)
	output += "```\n"

	output += "Xマッチ スケジュール\n"
	output += "```\n"
	output += battleScheduleSub(data.Result.X)
	output += "```\n"

	return output
}

func salmonRunSchedule() string {
	url := "https://spla3.yuu26.com/api/coop-grouping/schedule"

	resp, err := http.Get(url)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	byteArray, _ := io.ReadAll(resp.Body)
	var data SalmonRunSchedule
	err = json.Unmarshal(byteArray, &data)
	if err != nil {
		panic(err)
	}

	output := "サーモンラン スケジュール\n"
	output += "```\n"
	for _, v := range data.Results {
		output += fmt.Sprintf("%d/%d %2d:%02d- ", v.StartTime.Month(), v.StartTime.Day(), v.StartTime.Hour(), v.StartTime.Minute())
		output += v.Stage.Name + " "
		output += v.Boss.Name + "\n "
		for c, weapon := range v.Weapons {
			output += weapon.Name + " "
			if c == 1 {
				output += "\n "
			}
		}
		output += "\n"
	}
	output += "```\n"
	return output
}

func main() {
	discordChannelId := os.Getenv("DISCORD_CHANNEL_ID")
	discordToken := os.Getenv("DISCORD_TOKEN")

	discord, err := discordgo.New("Bot " + discordToken)
	if err != nil {
		panic(err)
	}

	output := battleSchedule()
	output += salmonRunSchedule()
	jst, err := time.LoadLocation("Asia/Tokyo")
	if err != nil {
		panic(err)
	}
	output += "updated at " + time.Now().In(jst).Format("1/2 15:04") + "\n"
	print(output)

	msgidstore := NewMsgIDStore()
	if msgidstore.Exist() {
		id, err := msgidstore.Get()
		if err != nil {
			panic(err)
		}
		// If the message ID exists, edit the message
		_, err = discord.ChannelMessageEdit(discordChannelId, id, output)
		if err != nil {
			panic(err)
		}
	} else {
		msg, err := discord.ChannelMessageSend(discordChannelId, output)
		if err != nil {
			panic(err)
		}
		// Store msg ID
		err = msgidstore.Set(msg.ID)
		if err != nil {
			panic(err)
		}
	}
}