// Package main provides the main entry point for the Hyperledger Fabric Asset Transfer REST API
//
//	@title			Hyperledger Fabric Asset Transfer API
//	@version		1.0
//	@description	RESTful API for managing assets on Hyperledger Fabric blockchain
//	@termsOfService	http://swagger.io/terms/
//
//	@contact.name	API Support
//	@contact.url	http://www.swagger.io/support
//	@contact.email	support@swagger.io
//
//	@license.name	Apache 2.0
//	@license.url	http://www.apache.org/licenses/LICENSE-2.0.html
//
//	@host		localhost:8888
//	@BasePath	/api/v1
//
//	@schemes	http https
package main

import (
	"fmt"
	"log"
	"net/http"

	"spiderman/docs" // Import generated docs

	"spiderman/internal/api"
	"spiderman/internal/fabric"
	"spiderman/internal/logger"
	"spiderman/internal/middleware"
	"spiderman/pkg/config"

	"github.com/gorilla/mux"
	"github.com/sirupsen/logrus"
	httpSwagger "github.com/swaggo/http-swagger"
)

func main() {
	// Load configuration from environment variables and .env files
	cfg := config.LoadConfig()

	// Update Swagger configuration with values from config.env
	docs.SwaggerInfo.Host = fmt.Sprintf("%s:%s", cfg.Server.Host, cfg.Server.Port)

	// Initialize logger
	logger.Init(&cfg.Log)

	// Log startup information
	logger.Logger.WithFields(logrus.Fields{
		"environment":  cfg.Environment.Environment,
		"host":         cfg.Server.Host,
		"port":         cfg.Server.Port,
		"swagger_host": docs.SwaggerInfo.Host,
		"log_level":    cfg.Log.Level,
		"log_format":   cfg.Log.Format,
	}).Info("Starting Hyperledger Fabric Asset Transfer REST API")

	// Initialize Fabric client
	logger.Logger.Info("Initializing Fabric client...")
	fabricClient, err := fabric.NewClient(&cfg.Fabric)
	if err != nil {
		logger.Logger.WithError(err).Fatal("Failed to initialize Fabric client")
	}
	defer fabricClient.Close()

	// Create API handler
	apiHandler := api.NewHandler(fabricClient)

	// Setup router with middleware
	router := setupRouter(apiHandler, cfg)

	// Start server
	startServer(router, cfg)
}

func setupRouter(apiHandler *api.Handler, cfg *config.Config) *mux.Router {
	router := mux.NewRouter()

	// Add middleware in order
	router.Use(middleware.Recovery)
	router.Use(middleware.CORS)
	router.Use(middleware.Logging)

	// Swagger documentation route (only in development)
	if cfg.IsDevelopment() {
		router.PathPrefix("/swagger/").Handler(httpSwagger.WrapHandler)
		logger.Logger.Info("Swagger documentation enabled at /swagger/")
	}

	// API routes
	api := router.PathPrefix("/api/v1").Subrouter()

	// Health check
	router.HandleFunc("/health", apiHandler.HealthCheck).Methods("GET").Name("HealthCheck")

	// Ledger operations
	api.HandleFunc("/ledger/init", apiHandler.InitLedger).Methods("POST").Name("InitLedger")

	// Asset operations with OPTIONS support
	api.HandleFunc("/assets", apiHandler.GetAllAssets).Methods("GET").Name("GetAllAssets")
	api.HandleFunc("/assets", apiHandler.CreateAsset).Methods("POST").Name("CreateAsset")
	api.HandleFunc("/assets", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("AssetsOptions")

	api.HandleFunc("/assets/{id}", apiHandler.GetAssetByID).Methods("GET").Name("GetAssetByID")
	api.HandleFunc("/assets/{id}/transfer", apiHandler.TransferAsset).Methods("PUT").Name("TransferAsset")
	api.HandleFunc("/assets/{id}", apiHandler.UpdateAsset).Methods("PUT").Name("UpdateAsset")
	api.HandleFunc("/assets/{id}", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("AssetByIdOptions")
	api.HandleFunc("/assets/{id}/transfer", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("TransferAssetOptions")

	// Blockchain operations
	api.HandleFunc("/blockchain/height", apiHandler.GetBlockHeight).Methods("GET").Name("GetBlockHeight")
	api.HandleFunc("/blockchain/info", apiHandler.GetChainInfo).Methods("GET").Name("GetChainInfo")
	api.HandleFunc("/blockchain/height", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("BlockHeightOptions")
	api.HandleFunc("/blockchain/info", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("ChainInfoOptions")

	// Transaction operations
	api.HandleFunc("/transactions/{txid}", apiHandler.GetTransactionByID).Methods("GET").Name("GetTransactionByID")
	api.HandleFunc("/transactions/{txid}", func(w http.ResponseWriter, r *http.Request) {}).Methods("OPTIONS").Name("TransactionByIdOptions")

	return router
}

func startServer(router *mux.Router, cfg *config.Config) {
	host := cfg.Server.Host
	port := cfg.Server.Port

	logger.Logger.WithFields(logrus.Fields{
		"host":         host,
		"port":         port,
		"environment":  cfg.Environment.Environment,
		"swagger_url":  fmt.Sprintf("http://%s:%s/swagger/index.html", host, port),
		"health_url":   fmt.Sprintf("http://%s:%s/health", host, port),
		"api_base_url": fmt.Sprintf("http://%s:%s/api/v1", host, port),
	}).Info("Server configuration")

	fmt.Printf("Starting REST API server on %s:%s\n", host, port)
	fmt.Printf("Environment: %s\n", cfg.Environment.Environment)
	fmt.Printf("Health check: http://%s:%s/health\n", host, port)

	if cfg.IsDevelopment() {
		fmt.Printf("Swagger documentation: http://%s:%s/swagger/index.html\n", host, port)
	}

	logger.Logger.WithFields(logrus.Fields{
		"address": ":" + port,
	}).Info("Starting HTTP server")

	if err := http.ListenAndServe(":"+port, router); err != nil {
		log.Fatal("Failed to start server: ", err)
	}
}