// Package config resolves runtime configuration from flags and environment.
// Flags win over env; env wins over defaults.
package config

import (
	"flag"
	"os"
)

type Config struct {
	ReposPath     string // directory holding bare *.git repos
	ListenAddr    string // host:port to listen on
	BaseURL       string // public base URL (for absolute links, feeds)
	SoftServeHTTP string // Soft Serve HTTP clone base, reverse-proxied at /git in prod
	SoftServeDB   string // path to soft-serve.db; when set, only public repos are served
	WebhookSecret string // shared secret for the Soft Serve release webhook (empty disables it)
	DLPath        string // directory where release tarballs are written (served at /dl)
	TapRepo       string // bare repo name of the Homebrew tap (default "homebrew-tap")
	StatusSecret  string // shared secret for the CLI status endpoint (empty disables /status)
	StatePath     string // JSON file storing per-repo deploy status
}

// Load parses the `serve` flags (with env fallbacks) from args and returns the
// config. Pass the subcommand's arguments (os.Args[2:]).
func Load(args []string) Config {
	fs := flag.NewFlagSet("serve", flag.ExitOnError)
	var c Config
	fs.StringVar(&c.ReposPath, "repos", env("REPOS_PATH", "./repos"), "directory of bare *.git repositories")
	fs.StringVar(&c.ListenAddr, "addr", env("LISTEN_ADDR", ":8080"), "listen address")
	fs.StringVar(&c.BaseURL, "base-url", env("BASE_URL", "http://localhost:8080"), "public base URL")
	fs.StringVar(&c.SoftServeHTTP, "soft-serve-http", env("SOFT_SERVE_HTTP", "http://localhost:23232"), "git clone base shown in the UI footer (e.g. https://your-host/git)")
	fs.StringVar(&c.SoftServeDB, "soft-serve-db", env("SOFT_SERVE_DB", ""), "path to soft-serve.db; when set, only public (non-private, non-hidden) repos are served")
	fs.StringVar(&c.WebhookSecret, "webhook-secret", env("WEBHOOK_SECRET", ""), "shared secret for the Soft Serve release webhook (empty disables /hooks/release)")
	fs.StringVar(&c.DLPath, "dl-path", env("DL_PATH", "/var/lib/custard/dl"), "directory where release tarballs are written")
	fs.StringVar(&c.TapRepo, "tap-repo", env("TAP_REPO", "homebrew-tap"), "bare repo name of the Homebrew tap")
	fs.StringVar(&c.StatusSecret, "status-secret", env("STATUS_SECRET", ""), "shared secret for the CLI status endpoint (empty disables /status)")
	fs.StringVar(&c.StatePath, "state-path", env("STATE_PATH", "/var/lib/custard/state/status.json"), "JSON file storing per-repo deploy status")
	_ = fs.Parse(args)
	return c
}

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