package config

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

type Config struct {
	ClientID     string   `json:"client_id"`
	MusicFolders []string `json:"music_folders"`
}

func getConfigPath() string {
	home, err := os.UserHomeDir()
	if err != nil {
		return ""
	}
	return filepath.Join(home, ".config", "mpv-discord-rpc", "config.json")
}

func loadConfig() (*Config, error) {
	configPath := getConfigPath()

	if _, err := os.Stat(configPath); os.IsNotExist(err) {
		return nil, fmt.Errorf("config file not found at %s\nExample config was created, fill in the values\n", configPath)
	}

	file, err := os.Open(configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to open config file: %w", err)
	}
	defer file.Close()

	var config Config
	decoder := json.NewDecoder(file)
	if err := decoder.Decode(&config); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	if config.ClientID == "" {
		return nil, fmt.Errorf("client_id is empty in config file")
	}

	return &config, nil
}

func createExampleConfig() error {
	configPath := getConfigPath()
	configDir := filepath.Dir(configPath)

	// Create directory if it doesn't exist
	if err := os.MkdirAll(configDir, 0755); err != nil {
		return fmt.Errorf("failed to create config directory: %w", err)
	}

	// Create example config
	exampleConfig := Config{
		ClientID: "your_discord_application_id_here",
		MusicFolders: []string{
			"folder1",
			"folder2",
		},
	}

	file, err := os.Create(configPath)
	if err != nil {
		return fmt.Errorf("failed to create config file: %w", err)
	}
	defer file.Close()

	encoder := json.NewEncoder(file)
	encoder.SetIndent("", "  ")
	if err := encoder.Encode(exampleConfig); err != nil {
		return fmt.Errorf("failed to write config file: %w", err)
	}

	return nil
}

func GetConfig() (*Config, error) {
	config, err := loadConfig()
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		fmt.Printf("\nConfig file location: %s\n", getConfigPath())
		createExampleConfig()
		os.Exit(1)
	}
	fmt.Println("✓ Config loaded")
	fmt.Printf("Client ID: %s\n", config.ClientID)

	return config, err
}