package routes

import (
	"dk/internal/actions"
	"dk/internal/auth"
	"dk/internal/helpers"
	"dk/internal/items"
	"dk/internal/middleware"
	"dk/internal/router"
	"dk/internal/template/components"
	"dk/internal/towns"
	"dk/internal/users"
	"slices"
	"strconv"
)

// Map acts as a representation of owned/unowned maps in the town stores.
type Map struct {
	ID    int
	Name  string
	Cost  int
	Owned bool
	X     int
	Y     int
	TP    int
}

func RegisterTownRoutes(r *router.Router) {
	group := r.Group("/town")
	group.Use(middleware.RequireAuth())
	group.Use(middleware.RequireTown())

	group.Get("/", showTown)
	group.Get("/inn", showInn)
	group.WithMiddleware(middleware.CSRF(auth.Manager)).Post("/inn", rest)
	group.Get("/shop", showShop)
	group.Get("/shop/buy/:id", buyItem)
	group.Get("/maps", showMaps)
	group.Get("/maps/buy/:id", buyMap)
}

func showTown(ctx router.Ctx, _ []string) {
	town := ctx.UserValue("town").(*towns.Town)
	components.RenderPage(ctx, town.Name, "town/town.html", map[string]any{
		"town":        town,
		"newscontent": components.GenerateTownNews(),
		"whosonline":  components.GenerateTownWhosOnline(),
	})
}

func showInn(ctx router.Ctx, _ []string) {
	var errorHTML string
	if flash := auth.GetFlashMessage(ctx); flash != nil {
		errorHTML = `<div style="color: red; margin-bottom: 1rem;">` + flash.Message + "</div>"
	}

	town := ctx.UserValue("town").(*towns.Town)

	components.RenderPage(ctx, town.Name+" Inn", "town/inn.html", map[string]any{
		"town":          town,
		"rested":        false,
		"error_message": errorHTML,
	})
}

func rest(ctx router.Ctx, _ []string) {
	town := ctx.UserValue("town").(*towns.Town)
	user := ctx.UserValue("user").(*users.User)

	if user.Gold < town.InnCost {
		auth.SetFlashMessage(ctx, "error", "You can't afford to stay here tonight.")
		ctx.Redirect("/town/inn", 303)
		return
	}

	user.Set("Gold", user.Gold-town.InnCost)
	user.Set("HP", user.MaxHP)
	user.Set("MP", user.MaxMP)
	user.Set("TP", user.MaxTP)
	user.Save()

	components.RenderPage(ctx, town.Name+" Inn", "town/inn.html", map[string]any{
		"town":   town,
		"rested": true,
	})
}

func showShop(ctx router.Ctx, _ []string) {
	var errorHTML string
	if flash := auth.GetFlashMessage(ctx); flash != nil {
		errorHTML = `<div style="color: red; margin-bottom: 1rem;">` + flash.Message + "</div>"
	}

	town := ctx.UserValue("town").(*towns.Town)

	var itemlist []*items.Item
	if town.ShopList != "" {
		itemMap := helpers.NewOrderedMap[int, *items.Item]()
		for _, id := range town.GetShopItems() {
			if item, err := items.Find(id); err == nil {
				itemMap.Set(id, item)
			}
		}
		itemlist = itemMap.ToSlice()
	}

	components.RenderPage(ctx, town.Name+" Shop", "town/shop.html", map[string]any{
		"town":          town,
		"itemlist":      itemlist,
		"error_message": errorHTML,
	})
}

func buyItem(ctx router.Ctx, params []string) {
	id, err := strconv.Atoi(params[0])
	if err != nil {
		auth.SetFlashMessage(ctx, "error", "Error purchasing item; "+err.Error())
		ctx.Redirect("/town/shop", 302)
		return
	}

	town := ctx.UserValue("town").(*towns.Town)
	if !slices.Contains(town.GetShopItems(), id) {
		auth.SetFlashMessage(ctx, "error", "The item doesn't exist in this shop.")
		ctx.Redirect("/town/shop", 302)
		return
	}

	item, err := items.Find(id)
	if err != nil {
		auth.SetFlashMessage(ctx, "error", "Error purchasing item; "+err.Error())
		ctx.Redirect("/town/shop", 302)
		return
	}

	user := ctx.UserValue("user").(*users.User)
	if user.Gold < item.Value {
		auth.SetFlashMessage(ctx, "error", "You don't have enough gold to buy "+item.Name)
		ctx.Redirect("/town/shop", 302)
		return
	}

	user.Set("Gold", user.Gold-item.Value)
	actions.UserEquipItem(user, item)
	user.Save()

	ctx.Redirect("/town/shop", 302)
}

func showMaps(ctx router.Ctx, _ []string) {
	var errorHTML string
	if flash := auth.GetFlashMessage(ctx); flash != nil {
		errorHTML = `<div style="color: red; margin-bottom: 1rem;">` + flash.Message + "</div>"
	}

	town := ctx.UserValue("town").(*towns.Town)
	user := ctx.UserValue("user").(*users.User)

	maplist := helpers.NewOrderedMap[int, Map]()
	towns, _ := towns.All()
	var mapped []int
	if user.Towns != "" {
		mapped = user.GetTownIDs()
	}
	for _, town := range towns {
		var owned bool
		if mapped != nil && slices.Contains(mapped, town.ID) {
			owned = true
		} else {
			owned = false
		}

		maplist.Set(town.ID, Map{
			ID:    town.ID,
			Name:  town.Name,
			Cost:  town.MapCost,
			Owned: owned,
			X:     town.X,
			Y:     town.Y,
			TP:    town.TPCost,
		})
	}

	components.RenderPage(ctx, town.Name+" Maps", "town/maps.html", map[string]any{
		"town":          town,
		"maplist":       maplist.ToSlice(),
		"error_message": errorHTML,
	})
}

func buyMap(ctx router.Ctx, params []string) {
	id, err := strconv.Atoi(params[0])
	if err != nil {
		auth.SetFlashMessage(ctx, "error", "Error purchasing map; "+err.Error())
		ctx.Redirect("/town/maps", 302)
		return
	}

	mapped, err := towns.Find(id)
	if err != nil {
		auth.SetFlashMessage(ctx, "error", "Error purchasing map; "+err.Error())
		ctx.Redirect("/town/maps", 302)
		return
	}

	user := ctx.UserValue("user").(*users.User)
	if user.Gold < mapped.MapCost {
		auth.SetFlashMessage(ctx, "error", "You don't have enough gold to buy the map to "+mapped.Name)
		ctx.Redirect("/town/maps", 302)
		return
	}

	user.Set("Gold", user.Gold-mapped.MapCost)
	if user.Towns == "" {
		user.Set("Towns", params[0])
	} else {
		user.Set("Towns", user.Towns+","+params[0])
	}
	user.Save()

	ctx.Redirect("/town/maps", 302)
}