/*
 * Copyright (C) 2023 Jonni Liljamo <jonni@liljamo.com>
 *
 * This file is licensed under AGPL-3.0-or-later, see NOTICE and LICENSE for
 * more information.
 */
package main

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

	"git.src.quest/~skye/felu-ddns/components"
	"git.src.quest/~skye/felu-ddns/config"
	"git.src.quest/~skye/felu-ddns/db"
	"git.src.quest/~skye/felu-ddns/dns"
	"git.src.quest/~skye/felu-ddns/handlers"
	"git.src.quest/~skye/felu-ddns/middlewares"
	"github.com/alexedwards/scs/v2"
	"github.com/gin-gonic/gin"
	"golang.org/x/sync/errgroup"
)

var version = "notset-builtin"

var (
	g errgroup.Group
	sessionManager *scs.SessionManager
)

func ginLogFormat(param gin.LogFormatterParams, router string) string {
	var statusColor, methodColor, resetColor string
	if param.IsOutputColor() {
		statusColor = param.StatusCodeColor()
		methodColor = param.MethodColor()
		resetColor = param.ResetColor()
	}

	if param.Latency > time.Minute {
		param.Latency = param.Latency.Truncate(time.Second)
	}
	return fmt.Sprintf("[GIN] [felu/%-8s] | %v |%s %3d %s| %13v | %15s |%s %-7s %s %#v\n%s",
		router,
		param.TimeStamp.Format("2006/01/02 - 15:04:05"),
		statusColor, param.StatusCode, resetColor,
		param.Latency,
		param.ClientIP,
		methodColor, param.Method, resetColor,
		param.Path,
		param.ErrorMessage,
	)
}

func setupFrontendRouter() *gin.Engine {
	r := gin.New()
	r.Use(gin.Recovery())
	r.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {
		return ginLogFormat(param, "frontend")
	}))
	r.Static("/static", "./static")
	r.HTMLRender = &TemplRender{}

	r.GET("/", func(c *gin.Context) {
		c.HTML(http.StatusOK, "", components.Index())
	})

	r.GET("/login", middlewares.SessionExists(sessionManager), func(c *gin.Context) {
		c.HTML(http.StatusOK, "", components.Login())
	})

	auth := r.Group("/auth")
	{
		auth.POST("/login", func(c *gin.Context) {
			handlers.AuthLogin(sessionManager, c)
		})
	}

	// routes for the actual application frontend
	manage := r.Group("/manage").Use(middlewares.SessionExists(sessionManager))
	{
		manage.GET("/", func(c *gin.Context) {
			c.HTML(http.StatusOK, "", components.Manage())
		})
		manage.GET("/settings", func(c *gin.Context) {
			c.HTML(http.StatusOK, "", components.ManageSettings())
		})
	}
	manageAdmin := r.Group("/manage/admin").Use(
		middlewares.SessionExists(sessionManager),
		middlewares.AdminOnly(),
	)
	{
		manageAdmin.GET("/", handlers.ManageAdmin())
		manageAdmin.GET("/users", handlers.ManageAdminUsers())
		manageAdmin.GET("/domains", handlers.ManageAdminDomains())

		manageAdmin.GET("/partials/users_list", handlers.AdminPartialsUsersList())
	}

	return r
}

func setupBackendRouter() *gin.Engine {
	r := gin.New()
	r.Use(gin.Recovery())
	r.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {
		return ginLogFormat(param, "backend")
	}))

	r.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			"status": "success",
		})
	})

	r.GET("/version", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			"version": version,
		})
	})

	return r
}

func main() {
	log.Print("[felu] Starting up...")

	config.InitConfig()

	if err := db.InitDB(); err != nil {
		log.Fatalf("[felu] Failed to initialize database: '%s'", err)
	}
	defer db.DBConn.Close()
	if err := db.InitAdminUser(); err != nil {
		log.Fatalf("[felu] Failed to initialize admin user: '%s'", err)
	}

	sessionManager = scs.New()
	sessionManager.Lifetime = 6 * time.Hour

	frontend := &http.Server{
		Addr: config.FeluConfig.FrontendBindAddr,
		Handler: sessionManager.LoadAndSave(setupFrontendRouter()),
		ReadTimeout: 5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	backend := &http.Server{
		Addr: config.FeluConfig.BackendBindAddr,
		Handler: setupBackendRouter(),
		ReadTimeout: 5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	log.Printf("[felu] Serving frontend at '%s'", config.FeluConfig.FrontendBindAddr)
	g.Go(func() error {
		return frontend.ListenAndServe()
	})

	log.Printf("[felu] Serving backend at '%s'", config.FeluConfig.BackendBindAddr)
	g.Go(func() error {
		return backend.ListenAndServe()
	})

	dnsIP := config.FeluConfig.DNSBindIP
	dnsPort := strconv.Itoa(int(config.FeluConfig.DNSBindPort))
	dnsAddr := dnsIP + ":" + dnsPort
	log.Printf("[felu] Serving DNS at '%s'", dnsAddr)
	g.Go(func() error {
		return dns.Run(dnsAddr)
	})

	if err := g.Wait(); err != nil {
		log.Fatalf("[felu] Error while running: %s", err)
	}
}