// main is the composition root for the application.
// It wires together config, logger, and domain services — nothing more.
// Business logic lives in internal/; cmd/ is deliberately thin.
package main

import (
	"fmt"
	"os"

	"gitea.djmil.dev/djmil/go-template/internal/config"
	"gitea.djmil.dev/djmil/go-template/internal/greeter"
	"gitea.djmil.dev/djmil/go-template/internal/logger"
)

func main() {
	if err := run(); err != nil {
		fmt.Fprintf(os.Stderr, "fatal: %v\n", err)
		os.Exit(1)
	}
}

func run() error {
	// ── Config ────────────────────────────────────────────────────────────────
	cfgPath := os.Getenv("CONFIG_PATH")
	if cfgPath == "" {
		cfgPath = "config/dev.yaml"
	}

	cfg, err := config.Load(cfgPath)
	if err != nil {
		return fmt.Errorf("loading config: %w", err)
	}

	// ── Logger ────────────────────────────────────────────────────────────────
	var log *logger.Logger
	if cfg.App.Env == "dev" {
		log, err = logger.NewDevelopment()
	} else {
		log, err = logger.New(cfg.Logger.Level)
	}
	if err != nil {
		return fmt.Errorf("creating logger: %w", err)
	}
	defer log.Sync()

	log.WithFields(map[string]any{
		"app": cfg.App.Name,
		"env": cfg.App.Env,
	}).Info("starting up")

	// ── Services ──────────────────────────────────────────────────────────────
	greetSvc := greeter.New(log)

	// ── Example usage ─────────────────────────────────────────────────────────
	msg, err := greetSvc.Greet("Gopher")
	if err != nil {
		return fmt.Errorf("greeter: %w", err)
	}

	log.WithField("message", msg).Info("greeting complete")

	fmt.Printf("%s (listening on :%d)\n", msg, cfg.App.Port)

	return nil
}