package main

import (
	"fmt"
	"html/template"
	"log"
	"time"

	"git.phc.dm.unipi.it/phc/website/articles"
	"git.phc.dm.unipi.it/phc/website/auth"
	"git.phc.dm.unipi.it/phc/website/config"
	"git.phc.dm.unipi.it/phc/website/model"
	"git.phc.dm.unipi.it/phc/website/templates"
	"git.phc.dm.unipi.it/phc/website/util"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/logger"
	"github.com/gofiber/fiber/v2/middleware/recover"
	"github.com/gofiber/redirect/v2"
)

func UserMiddleware(as auth.Service) fiber.Handler {
	return func(c *fiber.Ctx) error {
		token := c.Cookies("session-token")
		user, _ := auth.UserForSession(as, token)
		c.Locals("user", user)
		return c.Next()
	}
}

func main() {
	config.Load()

	app := fiber.New()

	app.Use(logger.New())
	app.Use(recover.New())

	// Remove trailing slash from URLs
	app.Use(redirect.New(redirect.Config{
		Rules: map[string]string{
			"/*/": "/$1",
		},
	}))

	// Serve content statically from "./public", mounted on the "/public/" route
	app.Static("/public/", "./public")

	authService := auth.NewDefaultService(config.AuthServiceHost)
	app.Use(UserMiddleware(authService))

	// Templates & Renderer
	renderer := templates.NewRenderer(
		"./views/",
		"./views/base.html",
		"./views/partials/*.html",
	)

	newsArticlesRegistry := articles.NewRegistry("./news")

	// Routes

	actuallyStaticRoutes := map[string]string{
		"/":       "home.html",
		"/link":   "link.html",
		"/login":  "login.html",
		"/utenti": "utenti.html",
	}

	for route, view := range actuallyStaticRoutes {
		localView := view
		app.Get(route, func(c *fiber.Ctx) error {
			c.Type("html")
			return renderer.Render(c, localView, util.H{
				"User": c.Locals("user"),
			})
		})
	}

	app.Get("/api/utenti", func(c *fiber.Ctx) error {
		utenti, err := authService.GetUsers()
		if err != nil {
			return err
		}

		return c.JSON(utenti)
	})

	app.Get("/api/profilo", func(c *fiber.Ctx) error {
		user := c.Locals("user")
		if user == nil {
			return fmt.Errorf(`user not logged in`)
		}

		return c.JSON(user)
	})

	app.Get("/storia", func(c *fiber.Ctx) error {
		storia, err := GetStoria()
		if err != nil {
			return err
		}

		c.Type("html")
		return renderer.Render(c, "storia.html", util.H{
			"User":   c.Locals("user"),
			"Storia": storia,
		})
	})

	app.Get("/appunti", func(c *fiber.Ctx) error {
		searchQuery := c.Query("q", "")

		c.Type("html")
		return renderer.Render(c, "appunti.html", util.H{
			"User":  c.Locals("user"),
			"Query": searchQuery,
		})
	})

	app.Get("/news", func(c *fiber.Ctx) error {
		articles, err := newsArticlesRegistry.GetArticles()
		if err != nil {
			return err
		}

		c.Type("html")
		return renderer.Render(c, "news.html", util.H{
			"User":     c.Locals("user"),
			"Articles": articles,
		})
	})

	app.Post("/login", func(c *fiber.Ctx) error {
		var loginForm struct {
			Provider string `form:"provider"`
			Username string `form:"username"`
			Password string `form:"password"`
		}

		if err := c.BodyParser(&loginForm); err != nil {
			return err
		}

		session, err := authService.Login(loginForm.Username, loginForm.Password)
		if err != nil {
			return err
		}

		inThreeDays := time.Now().Add(3 * 24 * time.Hour)
		c.Cookie(&fiber.Cookie{
			Name:    "session-token",
			Path:    "/",
			Value:   session.Token,
			Expires: inThreeDays,
		})

		return c.Redirect("/profilo")
	})

	app.Get("/profilo", func(c *fiber.Ctx) error {
		user, ok := c.Locals("user").(*model.User)
		if !ok || user == nil {
			return fmt.Errorf(`user not logged in`)
		}

		c.Type("html")
		return renderer.Render(c, "profilo.html", util.H{
			"User": c.Locals("user"),
		})
	})

	app.Get("/logout", func(c *fiber.Ctx) error {
		c.Cookie(&fiber.Cookie{
			Name:    "session-token",
			Path:    "/",
			Value:   "",
			Expires: time.Now(),
		})
		return c.Redirect("/")
	})

	app.Get("/news/:article", func(c *fiber.Ctx) error {
		articleID := c.Params("article")

		article, err := newsArticlesRegistry.GetArticle(articleID)
		if err != nil {
			return err
		}

		html, err := article.Render()
		if err != nil {
			return err
		}

		c.Type("html")
		return renderer.Render(c, "news-base.html", util.H{
			"User":        c.Locals("user"),
			"Article":     article,
			"ContentHTML": template.HTML(html),
		})
	})

	log.Printf("Starting server on host %q", config.Host)
	err := app.Listen(config.Host)
	if err != nil {
		log.Fatal(err)
	}
}