package game

import (
	"fmt"
	"image"
	"image/color"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/vector"

	"gitea.brasse-pc.eu/brasse/metro-puzzle-jp/internal/progress"
)

// Butiken i kiosken: banans sortiment (eller ett seedat urval), köps kontant.

type shop struct {
	items  []progress.Item
	cursor int
	msg    string
}

const shopSize = 5

func (s *LevelScene) openShop(g *Game) {
	sh := &shop{}
	ids := s.run.Level.Shop
	if len(ids) == 0 {
		// Seedat urval ur allt köpbart, så att samma omgång ger samma butik.
		all := g.Catalog.Purchasable()
		r := s.run.Seed.Derive("shop").New()
		r.Shuffle(len(all), func(i, j int) { all[i], all[j] = all[j], all[i] })
		for _, it := range all {
			ids = append(ids, it.ID)
			if len(ids) >= shopSize {
				break
			}
		}
	}
	for _, id := range ids {
		if it := g.Catalog.Item(id); it != nil {
			sh.items = append(sh.items, *it)
		}
	}
	s.shop = sh
}

func (s *LevelScene) updateShop(g *Game) {
	sh := s.shop
	if backJustPressed() || shopJustPressed() {
		s.shop = nil
		return
	}
	if n := len(sh.items); n > 0 {
		sh.cursor = (sh.cursor + menuMove() + n) % n
		if confirmJustPressed() {
			it := sh.items[sh.cursor]
			switch {
			case g.Progress.Own(it.ID):
				sh.msg = g.Assets.T("shop.owned")
			case g.Progress.Buy(g.Catalog, it.ID, g.Wallet.PayCash):
				sh.msg = fmt.Sprintf(g.Assets.T("shop.bought"), it.Name.Get(UILang))
				g.Save()
			default:
				sh.msg = g.Assets.T("shop.too_expensive")
			}
		}
	}
}

func (s *LevelScene) drawShop(g *Game, screen *ebiten.Image) {
	a := g.Assets
	sh := s.shop
	p := image.Rect(12, 28, ScreenW-12, ScreenH-10)
	vector.DrawFilledRect(screen, float32(p.Min.X), float32(p.Min.Y), float32(p.Dx()), float32(p.Dy()), colPanel, false)
	vector.DrawFilledRect(screen, float32(p.Min.X), float32(p.Min.Y), float32(p.Dx()), 3, colKnown, false)
	x, y := p.Min.X+8, p.Min.Y+8
	a.DrawBig(screen, "売店", x, y, colKnown)
	a.Draw(screen, fmt.Sprintf("%s   %s %d¥", a.T("shop.title"), a.T("hud.cash"), g.Wallet.Cash), x+36, y+2, colText)
	y += 24
	for i, it := range sh.items {
		ry := y + i*LineH
		if i == sh.cursor {
			vector.DrawFilledRect(screen, float32(x-2), float32(ry-1), float32(p.Dx()-12), LineH, colBar, false)
		}
		col := colText
		if g.Progress.Own(it.ID) {
			col = colGood
		} else if it.Price > g.Wallet.Cash {
			col = colDim
		}
		a.Draw(screen, it.Name.Get(UILang), x, ry, col)
		a.Draw(screen, effectText(a, it.Effect), x+110, ry, colDim)
		price := fmt.Sprintf("%d円", it.Price)
		if g.Progress.Own(it.ID) {
			price = a.T("items.owned_short")
		}
		a.Draw(screen, price, p.Max.X-10-a.Width(price), ry, col)
	}
	if sh.msg != "" {
		a.Draw(screen, sh.msg, x, p.Max.Y-28, colKnown)
	}
	a.Draw(screen, a.T("shop.hint"), x, p.Max.Y-16, colDim)
	_ = color.RGBA{}
}