package main

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

// loadConfig reads the configuration file from the specified working directory.
// If the file does not exist or cannot be read, it returns a default configuration.
func loadConfig(cwd string) Config {
	configPath := filepath.Join(cwd, configFileName)
	file, err := os.ReadFile(configPath)
	if err != nil {
		return Config{
			CustomColors: CustomColors{
				BgColor:       "#0d1117",
				CardBg:        "#161b22",
				BorderColor:   "#30363d",
				AccentColor:   "#58a6ff",
				TextPrimary:   "#c9d1d9",
				TextSecondary: "#8b949e",
				TextMuted:     "#484f58",
				ButtonText:    "#ffffff",
			},
		}
	}

	var config Config
	json.Unmarshal(file, &config)
	if config.CustomColors.BgColor == "" {
		config.CustomColors = CustomColors{
			BgColor:       "#0d1117",
			CardBg:        "#161b22",
			BorderColor:   "#30363d",
			AccentColor:   "#58a6ff",
			TextPrimary:   "#c9d1d9",
			TextSecondary: "#8b949e",
			TextMuted:     "#484f58",
			ButtonText:    "#ffffff",
		}
	}
	return config
}

// saveConfig writes the provided configuration to the specified file path.
// It marshals the config struct to JSON with indentation.
func saveConfig(path string, config Config) {
	data, err := json.MarshalIndent(config, "", "  ")
	if err != nil {
		fmt.Println("Error saving config:", err)
		return
	}
	os.WriteFile(path, data, 0644)
}

// humanize converts a byte count into a human-readable string (e.g., "1.2 MiB").
func humanize(bytes int64) string {
	if bytes < 1024 {
		return fmt.Sprintf("%d B", bytes)
	}
	exp := int(math.Log(float64(bytes)) / math.Log(1024))
	pre := "KMGTPE"[exp-1 : exp]
	return fmt.Sprintf("%.1f %siB", float64(bytes)/math.Pow(1024, float64(exp)), pre)
}