package main

import (
	"flag"
	"fmt"
	"os"
	"strings"
	"time"

	tea "github.com/charmbracelet/bubbletea"
)

func main() {
	var (
		repo     = flag.String("repo", os.Getenv("GH_REPO"), "GitHub repository as owner/name (or GH_REPO)")
		poll     = flag.Duration("poll", 10*time.Second, "refresh interval")
		showAll  = flag.Bool("all", false, "show all open PRs, not only PRs authored by you")
		limit    = flag.Int("limit", 50, "maximum open PRs to load (1-100)")
		endpoint = flag.String("endpoint", "https://api.github.com/graphql", "GitHub GraphQL endpoint")
	)
	flag.Parse()

	parts := strings.Split(*repo, "/")
	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
		exitf("--repo owner/name (or GH_REPO) is required")
	}
	if *limit < 1 || *limit > 100 {
		exitf("--limit must be between 1 and 100")
	}
	if *poll < 2*time.Second {
		exitf("--poll must be at least 2s")
	}
	token, err := resolveToken(*endpoint)
	if err != nil {
		exitf("authenticate: %v", err)
	}

	client := NewGitHubClient(*endpoint, token)
	app := NewApp(client, parts[0], parts[1], *showAll, *limit, *poll)
	if _, err := tea.NewProgram(app, tea.WithAltScreen()).Run(); err != nil {
		exitf("run TUI: %v", err)
	}
}

func firstNonEmpty(values ...string) string {
	for _, value := range values {
		if value != "" {
			return value
		}
	}
	return ""
}

func exitf(format string, args ...any) {
	fmt.Fprintf(os.Stderr, "gh-threads: "+format+"\n", args...)
	os.Exit(1)
}

// Keep interface drift visible at compile time.
var _ GitHubService = (*GitHubClient)(nil)