package main

import (
	"context"
	"errors"
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"
	"time"
	_ "time/tzdata"

	"gitea.kazu634.com/kazu634/tver/internal/store"
	"gitea.kazu634.com/kazu634/tver/internal/tver"
	"gitea.kazu634.com/kazu634/tver/internal/web"
	"github.com/jackc/pgx/v5/pgxpool"
)

func main() {
	pool, err := openDatabase(context.Background(), os.Getenv("DATABASE_URL"), pgxpool.New, store.Migrate)
	if err != nil {
		log.Fatal(err)
	}
	defer pool.Close()
	address := os.Getenv("WEB_ADDR")
	if address == "" {
		address = ":8080"
	}
	client, err := tver.NewClient("", nil)
	if err != nil {
		log.Fatal(err)
	}
	server := &http.Server{
		Addr:              address,
		Handler:           web.NewHandler(client, store.New(pool), time.Now, log.Default()),
		ReadHeaderTimeout: 5 * time.Second,
	}
	log.Printf("web listening on %s", address)
	log.Fatal(server.ListenAndServe())
}

func openDatabase(ctx context.Context, databaseURL string,
	connect func(context.Context, string) (*pgxpool.Pool, error),
	migrate func(context.Context, *pgxpool.Pool) error) (*pgxpool.Pool, error) {
	if strings.TrimSpace(databaseURL) == "" {
		return nil, errors.New("DATABASE_URL が設定されていません")
	}
	pool, err := connect(ctx, databaseURL)
	if err != nil {
		return nil, errors.New("DATABASE_URL から接続プールを作成できません")
	}
	if err := migrate(ctx, pool); err != nil {
		pool.Close()
		return nil, fmt.Errorf("DB マイグレーションに失敗: %w", err)
	}
	return pool, nil
}