package _config

import (
	"fmt"
	"log"
	"net"
	"os"
	"strings"
	"time"

	"github.com/spf13/viper"
)

type Mode string

const (
	ZZ Mode = "ZZ"
	Z2 Mode = "Z2"
	Z1 Mode = "Z1"
)

func (m Mode) String() string {
	return string(m)
}

// Config holds the global server-wide config.
type Config struct {
	Host                   string `mapstructure:"Host"`
	BinPath                string `mapstructure:"BinPath"`
	Language               string
	DisableSoftCrash       bool     // Disables the 'Press Return to exit' dialog allowing scripts to reboot the server automatically
	HideLoginNotice        bool     // Hide the Erupe notice on login
	LoginNotices           []string // MHFML string of the login notices displayed
	PatchServerManifest    string   // Manifest patch server override
	PatchServerFile        string   // File patch server override
	ScreenshotAPIURL       string   // Destination for screenshots uploaded to BBS
	DeleteOnSaveCorruption bool     // Attempts to save corrupted data will flag the save for deletion
	ClientMode             Mode
	DevMode                bool

	DevModeOptions  DevModeOptions
	GameplayOptions GameplayOptions
	Discord         Discord
	Commands        []Command
	Courses         []Course
	Database        Database
	Sign            Sign
	SignV2          SignV2
	Channel         Channel
	Entrance        Entrance
}

// DevModeOptions holds various debug/temporary options for use while developing Erupe.
type DevModeOptions struct {
	AutoCreateAccount    bool // Automatically create accounts if they don't exist
	CleanDB              bool // Automatically wipes the DB on server reset.
	MaxLauncherHR        bool // Sets the HR returned in the launcher to HR7 so that you can join non-beginner worlds.
	LogInboundMessages   bool // Log all messages sent to the server
	LogOutboundMessages  bool // Log all messages sent to the clients
	MaxHexdumpLength     int  // Maximum number of bytes printed when logs are enabled
	DivaEvent            int  // Diva Defense event status
	FestaEvent           int  // Hunter's Festa event status
	TournamentEvent      int  // VS Tournament event status
	MezFesEvent          bool // MezFes status
	MezFesAlt            bool // Swaps out Volpakkun for Tokotoko
	DisableTokenCheck    bool // Disables checking login token exists in the DB (security risk!)
	QuestDebugTools      bool // Enable various quest debug logs
	EarthStatusOverride  int32
	EarthIDOverride      int32
	EarthMonsterOverride int32
	SaveDumps            SaveDumpOptions
}

type SaveDumpOptions struct {
	Enabled   bool
	OutputDir string
}

// GameplayOptions has various gameplay modifiers
type GameplayOptions struct {
	FeaturedWeapons      int     // Number of Active Feature weapons to generate daily
	MaximumNP            int     // Maximum number of NP held by a player
	MaximumRP            uint16  // Maximum number of RP held by a player
	DisableLoginBoost    bool    // Disables the Login Boost system
	DisableBoostTime     bool    // Disables the daily NetCafe Boost Time
	BoostTimeDuration    int     // The number of minutes NetCafe Boost Time lasts for
	GuildMealDuration    int     // The number of minutes a Guild Meal can be activated for after cooking
	BonusQuestAllowance  uint32  // Number of Bonus Point Quests to allow daily
	DailyQuestAllowance  uint32  // Number of Daily Quests to allow daily
	MezfesSoloTickets    uint32  // Number of solo tickets given weekly
	MezfesGroupTickets   uint32  // Number of group tickets given weekly
	GUrgentRate          uint16  // Adjusts the rate of G Urgent quests spawning
	GCPMultiplier        float32 // Adjusts the multiplier of GCP rewarded for quest completion
	GRPMultiplier        float32 // Adjusts the multiplier of G Rank Points rewarded for quest completion
	GSRPMultiplier       float32 // Adjusts the multiplier of G Skill Rank Points rewarded for quest completion
	GZennyMultiplier     float32 // Adjusts the multiplier of G Zenny rewarded for quest completion
	MaterialMultiplier   float32 // Adjusts the multiplier of Monster Materials rewarded for quest completion
	ExtraCarves          uint16  // Grant n extra chances to carve ALL carcasses
	DisableHunterNavi    bool    // Disables the Hunter Navi
	EnableHiganjimaEvent bool    // Enables the Higanjima event in the Rasta Bar
	EnableNierEvent      bool    // Enables the Nier event in the Rasta Bar
	DisableRoad          bool    // Disables the Hunting Road
}

// Discord holds the discord integration config.
type Discord struct {
	Enabled           bool
	BotToken          string
	RealtimeChannelID string
}

// Command is a channelserver chat command
type Command struct {
	Name    string
	Enabled bool
	Prefix  string
}

// Course represents a course within MHF
type Course struct {
	Name    string
	Enabled bool
}

// Database holds the postgres database config.
type Database struct {
	Host     string
	Port     int
	User     string
	Password string
	Database string
}

// Sign holds the sign server config.
type Sign struct {
	Enabled bool
	Port    int
}

// SignV2 holds the new sign server config
type SignV2 struct {
	Enabled bool
	Port    int
}

type Channel struct {
	Enabled bool
}

// Entrance holds the entrance server config.
type Entrance struct {
	Enabled bool
	Port    uint16
	Entries []EntranceServerInfo
}

// EntranceServerInfo represents an entry in the serverlist.
type EntranceServerInfo struct {
	IP          string
	Type        uint8  // Server type. 0=?, 1=open, 2=cities, 3=newbie, 4=bar
	Season      uint8  // Server activity. 0 = green, 1 = orange, 2 = blue
	Recommended uint8  // Something to do with server recommendation on 0, 3, and 5.
	Name        string // Server name, 66 byte null terminated Shift-JIS(JP) or Big5(TW).
	Description string // Server description
	// 4096(PC, PS3/PS4)?, 8258(PC, PS3/PS4)?, 8192 == nothing?
	// THIS ONLY EXISTS IF Binary8Header.type == "SV2", NOT "SVR"!
	AllowedClientFlags uint32

	Channels []EntranceChannelInfo
}

// EntranceChannelInfo represents an entry in a server's channel list.
type EntranceChannelInfo struct {
	Port           uint16
	MaxPlayers     uint16
	CurrentPlayers uint16
}

var ErupeConfig *Config

func init() {
	var err error
	ErupeConfig, err = LoadConfig()
	if err != nil {
		preventClose(fmt.Sprintf("Failed to load config: %s", err.Error()))
	}
}

// getOutboundIP4 gets the preferred outbound ip4 of this machine
// From https://stackoverflow.com/a/37382208
func getOutboundIP4() net.IP {
	conn, err := net.Dial("udp4", "8.8.8.8:80")
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	localAddr := conn.LocalAddr().(*net.UDPAddr)

	return localAddr.IP.To4()
}

// LoadConfig loads the given config toml file.
func LoadConfig() (*Config, error) {
	viper.SetConfigName("config")
	viper.AddConfigPath(".")

	viper.SetDefault("DevModeOptions.SaveDumps", SaveDumpOptions{
		Enabled:   false,
		OutputDir: "savedata",
	})

	err := viper.ReadInConfig()
	if err != nil {
		return nil, err
	}

	c := &Config{}
	err = viper.Unmarshal(c)
	if err != nil {
		return nil, err
	}

	if c.Host == "" {
		c.Host = getOutboundIP4().To4().String()
	}

	switch strings.ToUpper(c.ClientMode.String()) {
	case "Z1":
		c.ClientMode = Z1
	case "Z2":
		c.ClientMode = Z2
	default:
		c.ClientMode = ZZ
	}

	return c, nil
}

func preventClose(text string) {
	if ErupeConfig.DisableSoftCrash {
		os.Exit(0)
	}
	fmt.Println("\nFailed to start Erupe:\n" + text)
	go wait()
	fmt.Println("\nPress Enter/Return to exit...")
	fmt.Scanln()
	os.Exit(0)
}

func wait() {
	for {
		time.Sleep(time.Millisecond * 100)
	}
}