package main

import (
	"crypto/rand"
	"encoding/hex"
	"errors"
)

// Opcodes
const (
	OpLoginRequest         uint16 = 0x0001
	OpLoginReply           uint16 = 0x0002
	OpWorldListRequest     uint16 = 0x0003
	OpWorldListReply       uint16 = 0x0004
	OpCharacterListRequest uint16 = 0x0005
	OpCharacterListReply   uint16 = 0x0006
	OpCreateCharacter      uint16 = 0x0007
	OpCreateCharacterReply uint16 = 0x0008
	OpDeleteCharacter      uint16 = 0x0009
	OpDeleteCharacterReply uint16 = 0x000A
	OpPlayCharacter        uint16 = 0x000B
	OpPlayCharacterReply   uint16 = 0x000C
	OpError                uint16 = 0xFFFF
)

var ErrIncompletePacket = errors.New("incomplete packet")

type EQ2Packet struct {
	Opcode uint16
	Size   uint16
	Data   []byte
}

type LoginRequest struct {
	Username string `json:"username"`
	Password string `json:"password"`
	Version  int16  `json:"version"`
}

type LoginResponse struct {
	Response   uint8  `json:"response"`
	AccountID  uint32 `json:"account_id"`
	SubLevel   uint32 `json:"sub_level"`
	RaceFlag   uint32 `json:"race_flag"`
	ClassFlag  uint32 `json:"class_flag"`
	Username   string `json:"username"`
	Unknown5   uint32 `json:"unknown5"`
	CitiesFlag uint8  `json:"cities_flag"`
	Reason     string `json:"reason,omitempty"`
}

type WorldInfo struct {
	ID         uint32 `json:"id"`
	Name       string `json:"name"`
	Status     uint8  `json:"status"`
	Players    uint32 `json:"players"`
	MaxPlayers uint32 `json:"max_players"`
	Address    string `json:"address"`
	Port       uint16 `json:"port"`
	Locked     bool   `json:"locked"`
}

type WorldListResponse struct {
	NumWorlds uint32       `json:"num_worlds"`
	Worlds    []*WorldInfo `json:"worlds"`
}

type Character struct {
	ID        uint32 `json:"id"`
	Name      string `json:"name"`
	Race      uint8  `json:"race"`
	Class     uint8  `json:"class"`
	Gender    uint8  `json:"gender"`
	Level     uint8  `json:"level"`
	Zone      string `json:"zone"`
	ServerID  uint32 `json:"server_id"`
	Created   int64  `json:"created"`
	LastLogin int64  `json:"last_login"`
}

type CharacterListResponse struct {
	NumCharacters uint32       `json:"num_characters"`
	Characters    []*Character `json:"characters"`
	AccountID     uint32       `json:"account_id"`
	MaxChars      uint32       `json:"max_chars"`
}

type CreateCharacterRequest struct {
	Name     string  `json:"name"`
	Race     uint8   `json:"race"`
	Class    uint8   `json:"class"`
	Gender   uint8   `json:"gender"`
	Deity    uint8   `json:"deity"`
	BodySize float32 `json:"body_size"`
	BodyAge  float32 `json:"body_age"`
	ServerID uint32  `json:"server_id"`
}

type CreateCharacterResponse struct {
	Success     bool   `json:"success"`
	CharacterID uint32 `json:"character_id"`
	Name        string `json:"name"`
	Error       string `json:"error,omitempty"`
}

type DeleteCharacterRequest struct {
	CharacterID uint32 `json:"character_id"`
	ServerID    uint32 `json:"server_id"`
}

type DeleteCharacterResponse struct {
	Success     bool   `json:"success"`
	CharacterID uint32 `json:"character_id"`
	Error       string `json:"error,omitempty"`
}

type PlayCharacterRequest struct {
	CharacterID uint32 `json:"character_id"`
	ServerID    uint32 `json:"server_id"`
}

type PlayCharacterResponse struct {
	Success    bool   `json:"success"`
	ServerIP   string `json:"server_ip"`
	ServerPort uint16 `json:"server_port"`
	SessionKey string `json:"session_key"`
	Error      string `json:"error,omitempty"`
}

type OpcodeManager struct {
	opcodes map[string]uint16
}

func (om *OpcodeManager) GetOpcode(name string) (uint16, bool) {
	opcode, exists := om.opcodes[name]
	return opcode, exists
}

func generateSessionKey() string {
	bytes := make([]byte, 16)
	rand.Read(bytes)
	return hex.EncodeToString(bytes)
}