package game

import (
	"fmt"
	"image/color"
	"path/filepath"

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

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

type menuEntry struct {
	id   string
	name string
	dest string
}

// MenuScene listar banorna och låter spelaren välja.
type MenuScene struct {
	entries []menuEntry
	sel     int
	err     error
}

// NewMenuScene läser in banlistan.
func NewMenuScene(a *Assets) (*MenuScene, error) {
	ids, err := level.List(a.LevelsDir)
	if err != nil {
		return nil, err
	}
	m := &MenuScene{}
	for _, id := range ids {
		l, err := level.LoadFile(filepath.Join(a.LevelsDir, id+".json"))
		if err != nil {
			m.err = err
			continue
		}
		m.entries = append(m.entries, menuEntry{id: id, name: l.Name.Get("sv"), dest: l.Destination.Get("romaji")}) // TODO(M3): japanska när fonten finns
	}
	return m, nil
}

func (m *MenuScene) Update(g *Game) error {
	if backJustPressed() {
		return ebiten.Termination
	}
	if n := len(m.entries); n > 0 {
		m.sel = (m.sel + menuMove() + n) % n
		if confirmJustPressed() {
			s, err := NewLevelScene(g.Assets, m.entries[m.sel].id)
			if err != nil {
				m.err = err
				return nil
			}
			g.SetScene(s)
		}
	}
	return nil
}

func (m *MenuScene) Draw(g *Game, screen *ebiten.Image) {
	screen.Fill(color.RGBA{24, 20, 37, 255})
	vector.DrawFilledRect(screen, 0, 0, ScreenW, 22, color.RGBA{38, 43, 68, 255}, false)
	ebitenutil.DebugPrintAt(screen, g.Assets.T("game.title"), 8, 4)
	ebitenutil.DebugPrintAt(screen, g.Assets.T("menu.choose_level"), 8, 30)

	for i, e := range m.entries {
		y := 46 + i*14
		if i == m.sel {
			vector.DrawFilledRect(screen, 6, float32(y-2), ScreenW-12, 13, color.RGBA{58, 68, 102, 255}, false)
		}
		ebitenutil.DebugPrintAt(screen, fmt.Sprintf("%s  -> %s", e.name, e.dest), 12, y)
	}
	if m.err != nil {
		ebitenutil.DebugPrintAt(screen, "FEL: "+m.err.Error(), 8, ScreenH-40)
	}
	ebitenutil.DebugPrintAt(screen, g.Assets.T("menu.hint"), 8, ScreenH-26)
	ebitenutil.DebugPrintAt(screen, fmt.Sprintf("%s (%s)", buildinfo.Version, buildinfo.Mode), 8, ScreenH-13)
}