package env

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

type Config struct {
	Port            int
	ConfigPath      string
	FrontDir        string // when set, serves the Astro static build at "/"
	SearchTTL       time.Duration
	CleanupInterval time.Duration
	Demo            bool // when true, disables searches and config mutations
}

func Load() (*Config, error) {
	cfg := &Config{
		Port:            8080,
		ConfigPath:      "/etc/iky/config.yaml",
		SearchTTL:       48 * time.Hour,
		CleanupInterval: time.Hour,
	}

	if v := os.Getenv("IKY_PORT"); v != "" {
		p, err := strconv.Atoi(v)
		if err != nil || p < 1 || p > 65535 {
			return nil, fmt.Errorf("env: IKY_PORT %q is not a valid port number", v)
		}
		cfg.Port = p
	}

	if v := os.Getenv("IKY_CONFIG"); v != "" {
		cfg.ConfigPath = v
	}

	if v := os.Getenv("IKY_FRONT_DIR"); v != "" {
		cfg.FrontDir = v
	}

	if v := os.Getenv("IKY_SEARCH_TTL"); v != "" {
		d, err := time.ParseDuration(v)
		if err != nil {
			return nil, fmt.Errorf("env: IKY_SEARCH_TTL %q is not a valid duration", v)
		}
		cfg.SearchTTL = d
	}

	if v := os.Getenv("IKY_CLEANUP_INTERVAL"); v != "" {
		d, err := time.ParseDuration(v)
		if err != nil {
			return nil, fmt.Errorf("env: IKY_CLEANUP_INTERVAL %q is not a valid duration", v)
		}
		cfg.CleanupInterval = d
	}

	if v := os.Getenv("IKY_DEMO"); v == "true" || v == "1" {
		cfg.Demo = true
	}

	return cfg, nil
}