package config

import (
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

type Config struct {
	Port              int
	DataDir           string
	DBPath            string
	LibraryDir        string
	TempDir           string
	YTDLPPath         string
	FFmpegPath        string
	FFprobePath       string
	BaseURL           string
	Workers           int
	SchedulerInterval int
}

func New() *Config {
	dataDir := getEnv("VIDARCHIVE_DATA_DIR", "./data")

	return &Config{
		Port:              getEnvInt("VIDARCHIVE_PORT", 8080, 1),
		DataDir:           dataDir,
		DBPath:            getEnv("VIDARCHIVE_DB_PATH", filepath.Join(dataDir, "vidarchive.db")),
		LibraryDir:        getEnv("VIDARCHIVE_LIBRARY_DIR", filepath.Join(dataDir, "library")),
		TempDir:           getEnv("VIDARCHIVE_TEMP_DIR", filepath.Join(dataDir, "temp")),
		YTDLPPath:         getEnv("VIDARCHIVE_YTDLP_PATH", "yt-dlp"),
		FFmpegPath:        getEnv("VIDARCHIVE_FFMPEG_PATH", "ffmpeg"),
		FFprobePath:       getEnv("VIDARCHIVE_FFPROBE_PATH", "ffprobe"),
		BaseURL:           getEnv("VIDARCHIVE_BASE_URL", ""),
		Workers:           getEnvInt("VIDARCHIVE_WORKERS", 2, 1),
		SchedulerInterval: getEnvInt("VIDARCHIVE_SCHEDULER_INTERVAL", 60, 1),
	}
}

func (c *Config) IsHTTPS() bool {
	return strings.HasPrefix(c.BaseURL, "https://")
}

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

// getEnvInt reads an int with a lower bound. A value below min is rejected in
// favour of the default: a zero or negative worker count, tick interval or port
// would otherwise stall downloads, spin the scheduler or fail to bind.
func getEnvInt(key string, defaultVal, min int) int {
	v := os.Getenv(key)
	if v == "" {
		return defaultVal
	}
	i, err := strconv.Atoi(v)
	if err != nil {
		fmt.Fprintf(os.Stderr, "invalid %s: %v, using default %d\n", key, err, defaultVal)
		return defaultVal
	}
	if i < min {
		fmt.Fprintf(os.Stderr, "invalid %s: %d is below the minimum %d, using default %d\n", key, i, min, defaultVal)
		return defaultVal
	}
	return i
}