package config

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
)

type Config struct {
	Client  ClientConfig  `json:"client"`
	Network NetworkConfig `json:"network"`
	Admin   AdminConfig   `json:"admin"`
	Player  PlayerConfig  `json:"player"`
	World   WorldConfig   `json:"world"`
}

type ClientConfig struct {
	Version                int    `json:"version"`
	ArtifactVersion        string `json:"artifactVersion"`
	ServerID               int    `json:"serverId"`
	Aid                    int    `json:"aid"`
	RpcMd5                 string `json:"rpcMd5"`
	NoMoreHotfixPatchError uint32 `json:"noMoreHotfixPatchError"`
}

type NetworkConfig struct {
	BindHost          string      `json:"bindHost"`
	AdvertisedHost    string      `json:"advertisedHost"`
	LoginPorts        []int       `json:"loginPorts"`
	GamePort          int         `json:"gamePort"`
	SocketHeartbeatMs int         `json:"socketHeartbeatMs"`
	WriteTimeoutMs    int         `json:"writeTimeoutMs"`
	Proxy             ProxyConfig `json:"proxy"`
}

type ProxyConfig struct {
	HttpsPort             int    `json:"httpsPort"`
	HttpPort              int    `json:"httpPort"`
	LoginListPort         int    `json:"loginListPort"`
	LoginTcpPort          int    `json:"loginTcpPort"`
	GameTcpPort           int    `json:"gameTcpPort"`
	SceneSubPort          int    `json:"sceneSubPort"`
	FastPatchPort         int    `json:"fastPatchPort"`
	UpdateHost            string `json:"updateHost"`
	CertificatePassphrase string `json:"certificatePassphrase"`
}

type AdminConfig struct {
	Enabled bool   `json:"enabled"`
	Host    string `json:"host"`
	Port    int    `json:"port"`
}

type PlayerConfig struct {
	Pid                     uint64 `json:"pid"`
	InitialUnitId           uint64 `json:"initialUnitId"`
	InitialSpiritTemplateId uint32 `json:"initialSpiritTemplateId"`
	AccountId               string `json:"accountId"`
	UserName                string `json:"userName"`
	DisplayName             string `json:"displayName"`
	LoginToken              string `json:"loginToken"`
	GameToken               string `json:"gameToken"`
	LoginUniverseId         uint32 `json:"loginUniverseId"`
	ShareToken              string `json:"shareToken"`
	FpPassToken             string `json:"fpPassToken"`
	Skey                    string `json:"skey"`
}

type Vec3 struct {
	X float64 `json:"x"`
	Y float64 `json:"y"`
	Z float64 `json:"z"`
}

type WorldConfig struct {
	RaidId              uint32  `json:"raidId"`
	SceneInstanceId     uint64  `json:"sceneInstanceId"`
	UniverseId          uint32  `json:"universeId"`
	Spawn               Vec3    `json:"spawn"`
	Facing              float32 `json:"facing"`
	EntryOpeningEnabled bool    `json:"entryOpeningEnabled"`
}

// LoadConfig reads and parses private-server.json from the specified path or standard locations.
func LoadConfig(path string) (*Config, error) {
	if path == "" {
		candidates := []string{
			"config/private-server.json",
			"../config/private-server.json",
			"../../config/private-server.json",
		}
		for _, c := range candidates {
			if _, err := os.Stat(c); err == nil {
				path = c
				break
			}
		}
	}

	if path == "" {
		return nil, fmt.Errorf("config/private-server.json not found")
	}

	absPath, err := filepath.Abs(path)
	if err != nil {
		absPath = path
	}

	data, err := os.ReadFile(absPath)
	if err != nil {
		return nil, fmt.Errorf("failed to read config from %s: %w", absPath, err)
	}

	var cfg Config
	if err := json.Unmarshal(data, &cfg); err != nil {
		return nil, fmt.Errorf("failed to parse json config from %s: %w", absPath, err)
	}

	// Apply default values if omitted
	if cfg.Network.BindHost == "" {
		cfg.Network.BindHost = "0.0.0.0"
	}
	if cfg.Network.AdvertisedHost == "" {
		cfg.Network.AdvertisedHost = "127.0.0.1"
	}
	if len(cfg.Network.LoginPorts) == 0 {
		cfg.Network.LoginPorts = []int{5200, 5201}
	}
	if cfg.Network.GamePort == 0 {
		cfg.Network.GamePort = 5202
	}
	if cfg.Network.Proxy.HttpsPort == 0 {
		cfg.Network.Proxy.HttpsPort = 443
	}
	if cfg.Network.Proxy.HttpPort == 0 {
		cfg.Network.Proxy.HttpPort = 80
	}
	if cfg.Network.Proxy.LoginListPort == 0 {
		cfg.Network.Proxy.LoginListPort = 5801
	}
	if cfg.Admin.Port == 0 {
		cfg.Admin.Port = 17888
	}
	if cfg.Player.Pid == 0 {
		cfg.Player.Pid = 100
	}
	if cfg.Player.InitialUnitId == 0 {
		cfg.Player.InitialUnitId = 100000000000
	}
	if cfg.Player.InitialSpiritTemplateId == 0 {
		cfg.Player.InitialSpiritTemplateId = 15020967 // Default character
	}

	return &cfg, nil
}