package d2player

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

type TestItem struct {
	width          int
	height         int
	inventorySlotX int
	inventorySlotY int
}

func (t *TestItem) InventoryGridSize() (int, int) {
	return t.width, t.height
}

func (t *TestItem) GetItemCode() string {
	return ""
}

func (t *TestItem) InventoryGridSlot() (int, int) {
	return t.inventorySlotX, t.inventorySlotY
}

func (t *TestItem) SetInventoryGridSlot(x int, y int) {
	t.inventorySlotX, t.inventorySlotY = x, y
}

func NewTestItem(width int, height int) *TestItem {
	return &TestItem{width: width, height: height}
}

func TestItemGrid_Add_Basic(t *testing.T) {
	grid := NewItemGrid(2, 2, 0, 0)

	tl := NewTestItem(1, 1)
	tr := NewTestItem(1, 1)
	bl := NewTestItem(1, 1)
	br := NewTestItem(1, 1)

	added, err := grid.Add(tl, tr, bl, br)

	assert.Equal(t, 4, added)
	assert.NoError(t, err)
	assert.Equal(t, tl, grid.GetSlot(0, 0))
	assert.Equal(t, tr, grid.GetSlot(1, 0))
	assert.Equal(t, bl, grid.GetSlot(0, 1))
	assert.Equal(t, br, grid.GetSlot(1, 1))

}

func TestItemGrid_Add_OverflowBasic(t *testing.T) {
	grid := NewItemGrid(2, 2, 0, 0)

	tl := NewTestItem(1, 1)
	tr := NewTestItem(1, 1)
	bl := NewTestItem(1, 1)
	br := NewTestItem(1, 1)
	o := NewTestItem(1, 1)

	added, err := grid.Add(tl, tr, bl, br, o)

	assert.Equal(t, 4, added)
	assert.Error(t, err)
	assert.Equal(t, tl, grid.GetSlot(0, 0))
	assert.Equal(t, tr, grid.GetSlot(1, 0))
	assert.Equal(t, bl, grid.GetSlot(0, 1))
	assert.Equal(t, br, grid.GetSlot(1, 1))

}

func TestItemGrid_Add_LargeItem(t *testing.T) {
	grid := NewItemGrid(3, 3, 0, 0)

	tl := NewTestItem(1, 1)
	o := NewTestItem(2, 2)

	added, err := grid.Add(tl, o)

	assert.Equal(t, 2, added)
	assert.NoError(t, err)
	assert.Equal(t, tl, grid.GetSlot(0, 0))
	assert.Equal(t, o, grid.GetSlot(1, 0))
	assert.Equal(t, o, grid.GetSlot(2, 0))
	assert.Nil(t, grid.GetSlot(0, 1))
	assert.Equal(t, o, grid.GetSlot(1, 1))
	assert.Equal(t, o, grid.GetSlot(2, 1))
	assert.Nil(t, grid.GetSlot(0, 2))
	assert.Nil(t, grid.GetSlot(1, 2))
	assert.Nil(t, grid.GetSlot(2, 2))

}

func TestItemGrid_Add_OverflowLargeItem(t *testing.T) {
	grid := NewItemGrid(2, 2, 0, 0)

	tl := NewTestItem(1, 1)
	o := NewTestItem(2, 2)

	added, err := grid.Add(tl, o)

	assert.Equal(t, 1, added)
	assert.Error(t, err)
	assert.Equal(t, tl, grid.GetSlot(0, 0))
	assert.Nil(t, grid.GetSlot(1, 0))
	assert.Nil(t, grid.GetSlot(0, 1))
	assert.Nil(t, grid.GetSlot(1, 1))

}