package main

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

type VsServerConfigOptions struct {
	ServerName      string `json:"ServerName"`
	Port            int    `json:"Port"`
	IpAddress       string `json:"IpAddress"`
	MaxClients      int    `json:"MaxClients"`
	Password        string `json:"Password"`
	DefaultRole     string `json:"DefaultRole"`
	GuestRole       string `json:"GuestRole"`
	PreApprovedRole string `json:"PreApprovedRole"`
}

// func WriteInstanceConfig(instanceDir string, settings VsServerConfig) error {
// 	configPath := filepath.Join(instanceDir, "serverconfig.json")

// 	if settings.IpAddress == "" {
// 		settings.IpAddress = "0.0.0.0"
// 	}
// 	if settings.MaxClients == 0 {
// 		settings.MaxClients = 16
// 	}

// 	data, err := json.MarshalIndent(settings, "", "  ")
// 	if err != nil {
// 		return fmt.Errorf("failed to marshal server configuration: %w", err)
// 	}

// 	err = os.WriteFile(configPath, data, 0644)
// 	if err != nil {
// 		return fmt.Errorf("failed writing serverconfig.json to instance: %w", err)
// 	}

// 	return nil
// }

func PrepareInstanceConfig(templateVersion string, instanceConfigPath string, config VsServerConfigOptions, cfg *AppConfig) error {
	templatePath := filepath.Join(cfg.Storage.ConfigTemplatesDir, templateVersion, "serverconfig.json")

	if _, err := os.Stat(instanceConfigPath); err == nil {
		return nil
	}

	if err := os.MkdirAll(filepath.Dir(instanceConfigPath), 0755); err != nil {
		return fmt.Errorf("failed creating instance directory tree: %w", err)
	}

	source, err := os.Open(templatePath)
	if err != nil {
		return fmt.Errorf("failed opening baseline template file: %w", err)
	}
	defer source.Close()

	destination, err := os.Create(instanceConfigPath)
	if err != nil {
		return fmt.Errorf("failed creating target instance configuration: %w", err)
	}
	defer destination.Close()

	if _, err := io.Copy(destination, source); err != nil {
		return fmt.Errorf("failed cloning configuration template payload: %w", err)
	}

	destination.Close()

	data, err := os.ReadFile(instanceConfigPath)
	if err != nil {
		return fmt.Errorf("failed reading cloned configuration data: %w", err)
	}

	var rawConfig map[string]interface{}
	if err := json.Unmarshal(data, &rawConfig); err != nil {
		return fmt.Errorf("failed parsing configuration JSON payload: %w", err)
	}

	rawConfig["ServerName"] = config.ServerName
	rawConfig["Port"] = config.Port
	rawConfig["MaxClients"] = config.MaxClients

	if config.Password != "" {
		rawConfig["Password"] = config.Password
	} else {
		rawConfig["Password"] = nil
	}

	instanceDir := filepath.Dir(instanceConfigPath)

	if worldConfig, ok := rawConfig["WorldConfig"].(map[string]interface{}); ok {
		worldConfig["SaveFileLocation"] = filepath.Join(instanceDir, "Saves", "default.vcdbs")
	}

	if modPaths, ok := rawConfig["ModPaths"].([]interface{}); ok {
		for i, pathVal := range modPaths {
			if strPath, ok := pathVal.(string); ok && (strings.Contains(strPath, "/vs-manager/instances/") || filepath.IsAbs(strPath)) && strPath != "Mods" {
				modPaths[i] = filepath.Join(instanceDir, "Mods")
			}
		}
	}

	updatedData, err := json.MarshalIndent(rawConfig, "", "  ")
	if err != nil {
		return fmt.Errorf("failed marshaling updated configuration adjustments: %w", err)
	}

	if err := os.WriteFile(instanceConfigPath, updatedData, 0644); err != nil {
		return fmt.Errorf("failed committing updated configuration to disk: %w", err)
	}

	return nil
}