// BaMoRT Desktop application entry point.
// Uses Wails v2 to wrap the existing Gin HTTP server in a native desktop window.
// The backend runs on localhost:8185 (SQLite); the WebView loads the bundled frontend.
package main

import (
	"context"
	"embed"
	"io/fs"
	"log"
	"os"
	"time"

	"bamort/appsystem"
	"bamort/character"
	"bamort/config"
	"bamort/database"
	"bamort/equipment"
	"bamort/gamesystem"
	"bamort/gsmaster"
	"bamort/importer"
	"bamort/logger"
	"bamort/maintenance"
	"bamort/models"
	"bamort/pdfrender"
	"bamort/router"
	"bamort/transfer"
	"bamort/user"

	"github.com/gin-gonic/gin"
	"github.com/wailsapp/wails/v2"
	"github.com/wailsapp/wails/v2/pkg/options"
	"github.com/wailsapp/wails/v2/pkg/options/assetserver"
)

// frontend/dist is populated by `wails build` running the frontend:build command
// in wails.json (outputs to ../desktop/frontend/dist via DESKTOP_BUILD=1).
//
//go:embed all:frontend/dist
var assets embed.FS

// App is the Wails application struct. Lifecycle hooks are attached to it.
type App struct {
	ctx context.Context
}

// NewApp creates the Wails application instance.
func NewApp() *App {
	return &App{}
}

// startup is called by Wails just before the WebView window is shown.
// It starts the Gin HTTP server in the background so the frontend can reach it.
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx
	startGinServer()
}

// GetAPIBaseURL returns the HTTP server address for the frontend to connect to.
// This allows the API port to be configured at runtime via .env without rebuilding.
func (a *App) GetAPIBaseURL() string {
	// GetServerAddress returns ":port", so we need to add localhost
	return "http://localhost" + config.Cfg.GetServerAddress()
}

// startGinServer initialises the database, runs migrations, and starts the
// Gin HTTP server on the configured port (default 8185) in a goroutine.
func startGinServer() {
	cfg := config.Cfg

	logger.Info("BaMoRT Desktop Server wird gestartet...")
	logger.Info("Environment: %s", cfg.Environment)
	logger.Info("Database: %s @ %s", cfg.DatabaseType, cfg.DatabaseURL)

	gin.SetMode(gin.ReleaseMode)

	// Connect to SQLite database.
	database.ConnectDatabase()

	// Auto-migrate all modules so a fresh SQLite file gets a complete schema.
	if err := models.MigrateStructure(); err != nil {
		logger.Warn("models migration: %s", err.Error())
	}
	if err := user.MigrateStructure(); err != nil {
		logger.Warn("user migration: %s", err.Error())
	}
	if err := gamesystem.MigrateStructure(); err != nil {
		logger.Warn("gamesystem migration: %s", err.Error())
	}
	if err := database.MigrateStructure(); err != nil {
		logger.Warn("database migration: %s", err.Error())
	}

	// Initialise PDF templates (source from ./default_templates if present).
	if err := pdfrender.InitializeTemplates("./default_templates", cfg.TemplatesDir); err != nil {
		logger.Warn("template init: %s", err.Error())
	}

	r := gin.Default()
	router.SetupGin(r)

	protected := router.BaseRouterGrp(r)
	user.RegisterRoutes(protected)
	gsmaster.RegisterRoutes(protected)
	character.RegisterRoutes(protected)
	equipment.RegisterRoutes(protected)
	maintenance.RegisterRoutes(protected)
	importer.RegisterRoutes(protected)
	pdfrender.RegisterRoutes(protected)
	transfer.RegisterRoutes(protected)
	appsystem.RegisterRoutes(protected)

	pdfrender.RegisterPublicRoutes(r)
	appsystem.RegisterPublicRoutes(r)

	logger.Info("Desktop API server starting on %s", cfg.GetServerAddress())
	go func() {
		if err := r.Run(cfg.GetServerAddress()); err != nil {
			log.Printf("Gin server error: %v", err)
		}
	}()

	// Brief pause to let the HTTP server bind before the WebView starts loading.
	time.Sleep(150 * time.Millisecond)
}

func main() {
	// Apply desktop defaults BEFORE anything uses config.Cfg.
	// config.init() already ran (at import time) and may have picked up .env;
	// here we ensure the critical SQLite settings exist even without a .env file.
	if os.Getenv("DATABASE_TYPE") == "" {
		_ = os.Setenv("DATABASE_TYPE", "sqlite")
	}
	if os.Getenv("DATABASE_URL") == "" {
		_ = os.Setenv("DATABASE_URL", "./bamort-desktop.db")
	}
	if os.Getenv("ENVIRONMENT") == "" {
		_ = os.Setenv("ENVIRONMENT", "desktop")
	}
	if os.Getenv("API_PORT") == "" {
		_ = os.Setenv("API_PORT", "8185")
	}
	if os.Getenv("TEMPLATES_DIR") == "" {
		_ = os.Setenv("TEMPLATES_DIR", "./templates")
	}
	if os.Getenv("EXPORT_TEMP_DIR") == "" {
		_ = os.Setenv("EXPORT_TEMP_DIR", "./export_temp")
	}

	// Reload config so the above env vars take effect (init() may have run first).
	config.Cfg = config.LoadConfig()

	// Sub-FS rooted at frontend/dist so Wails serves it from /.
	frontendFS, err := fs.Sub(assets, "frontend/dist")
	if err != nil {
		log.Fatal("frontend/dist embed error:", err)
	}

	app := NewApp()

	if err := wails.Run(&options.App{
		Title:     "BaMoRT",
		Width:     1400,
		Height:    900,
		MinWidth:  1024,
		MinHeight: 768,
		OnStartup: app.startup,
		Bind: []interface{}{
			app,
		},
		AssetServer: &assetserver.Options{
			Assets: frontendFS,
		},
	}); err != nil {
		log.Fatal(err)
	}
}