package config

import (
	"fmt"
	"os"
	"time"
)

type Config struct {
	Port           string
	GitHubToken    string
	GitHubOwner    string
	GitHubRepo     string
	CacheDuration  time.Duration
	UpdateInterval time.Duration
	Theme          string
	BaseURL        string
}

func Load() (*Config, error) {
	cfg := &Config{
		Port:           getEnv("PORT", "8080"),
		GitHubToken:    getEnv("GITHUB_TOKEN", ""),
		GitHubOwner:    getEnv("GITHUB_OWNER", ""),
		GitHubRepo:     getEnv("GITHUB_REPO", ""),
		CacheDuration:  getDurationEnv("CACHE_DURATION", 15*time.Minute),
		UpdateInterval: getDurationEnv("UPDATE_INTERVAL", 5*time.Minute),
		Theme:          getEnv("DEFAULT_THEME", "light"),
		BaseURL:        getEnv("BASE_URL", "http://localhost:8080"),
	}

	if cfg.GitHubToken == "" {
		return nil, fmt.Errorf("GITHUB_TOKEN environment variable is required")
	}
	if cfg.GitHubOwner == "" {
		return nil, fmt.Errorf("GITHUB_OWNER environment variable is required")
	}
	if cfg.GitHubRepo == "" {
		return nil, fmt.Errorf("GITHUB_REPO environment variable is required")
	}

	return cfg, nil
}

func getEnv(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

func getDurationEnv(key string, defaultValue time.Duration) time.Duration {
	if value := os.Getenv(key); value != "" {
		if duration, err := time.ParseDuration(value); err == nil {
			return duration
		}
	}
	return defaultValue
}