package main

import (
	"fmt"
	"os"
	"os/exec"
	"os/signal"

	"github.com/gin-gonic/gin"
	"github.com/jessevdk/go-flags"
	_ "github.com/lib/pq"
)

const VERSION = "0.5.1"

type Options struct {
	Version  bool   `short:"v" long:"version" description:"Print version"`
	Debug    bool   `short:"d" long:"debug" description:"Enable debugging mode" default:"false"`
	Url      string `long:"url" description:"Database connection string"`
	Host     string `long:"host" description:"Server hostname or IP"`
	Port     int    `long:"port" description:"Server port" default:"5432"`
	User     string `long:"user" description:"Database user"`
	Pass     string `long:"pass" description:"Password for user"`
	DbName   string `long:"db" description:"Database name"`
	Ssl      string `long:"ssl" description:"SSL option"`
	HttpHost string `long:"bind" description:"HTTP server host" default:"localhost"`
	HttpPort uint   `long:"listen" description:"HTTP server listen port" default:"8080"`
	AuthUser string `long:"auth-user" description:"HTTP basic auth user"`
	AuthPass string `long:"auth-pass" description:"HTTP basic auth password"`
	SkipOpen bool   `short:"s" long:"skip-open" description:"Skip browser open on start"`
}

var dbClient *Client
var options Options

func exitWithMessage(message string) {
	fmt.Println("Error:", message)
	os.Exit(1)
}

func initClient() {
	if connectionSettingsBlank(options) {
		return
	}

	client, err := NewClient()
	if err != nil {
		exitWithMessage(err.Error())
	}

	if options.Debug {
		fmt.Println("Server connection string:", client.connectionString)
	}

	fmt.Println("Connecting to server...")
	err = client.Test()
	if err != nil {
		exitWithMessage(err.Error())
	}

	fmt.Println("Checking tables...")
	_, err = client.Tables()
	if err != nil {
		exitWithMessage(err.Error())
	}

	dbClient = client
}

func initOptions() {
	_, err := flags.ParseArgs(&options, os.Args)

	if err != nil {
		os.Exit(1)
	}

	if options.Url == "" {
		options.Url = os.Getenv("DATABASE_URL")
	}

	if options.Version {
		fmt.Printf("pgweb v%s\n", VERSION)
		os.Exit(0)
	}
}

func startServer() {
	router := gin.Default()

	// Enable HTTP basic authentication only if both user and password are set
	if options.AuthUser != "" && options.AuthPass != "" {
		auth := map[string]string{options.AuthUser: options.AuthPass}
		router.Use(gin.BasicAuth(auth))
	}

	setupRoutes(router)

	fmt.Println("Starting server...")
	go func() {
		err := router.Run(fmt.Sprintf("%v:%v", options.HttpHost, options.HttpPort))
		if err != nil {
			fmt.Println("Cant start server:", err)
			os.Exit(1)
		}
	}()
}

func handleSignals() {
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt, os.Kill)
	<-c
}

func openPage() {
	url := fmt.Sprintf("http://%v:%v", options.HttpHost, options.HttpPort)
	fmt.Println("To view database open", url, "in browser")

	if options.SkipOpen {
		return
	}

	_, err := exec.Command("which", "open").Output()
	if err != nil {
		return
	}

	exec.Command("open", url).Output()
}

func main() {
	initOptions()

	fmt.Println("Pgweb version", VERSION)
	initClient()

	if dbClient != nil {
		defer dbClient.db.Close()
	}

	if !options.Debug {
		gin.SetMode("release")
	}

	if options.Debug {
		startRuntimeProfiler()
	}

	startServer()
	openPage()
	handleSignals()
}