package layout

import (
	"testing"

	"printer.backend/internal/model"
)

func TestPack(t *testing.T) {
	plate := model.Plate{
		WidthMM:      300,
		HeightMM:     400,
		MarginTop:    10,
		MarginRight:  10,
		MarginBottom: 10,
		MarginLeft:   10,
	}
	spec := model.ItemSpec{WidthMM: 80, HeightMM: 80, BleedMM: 2, MarginMM: 5}
	// canvas 106mm (80+2*13), cell 108, printable 280×380 → cols=2, rows=3
	preview := Pack(plate, spec, 2)
	if preview.Columns != 2 {
		t.Fatalf("columns: got %d want 2", preview.Columns)
	}
	if preview.Rows != 3 {
		t.Fatalf("rows: got %d want 3", preview.Rows)
	}
	if preview.Count != 6 {
		t.Fatalf("count: got %d want 6", preview.Count)
	}
	if preview.FootprintWMM != 80 {
		t.Fatalf("footprint width: got %v want 80", preview.FootprintWMM)
	}
	if preview.CanvasWidthMM != 106 {
		t.Fatalf("canvas width: got %v want 106", preview.CanvasWidthMM)
	}
	if len(preview.Positions) != 6 {
		t.Fatalf("positions: got %d want 6", len(preview.Positions))
	}
	if preview.Positions[0].XMM != 10 || preview.Positions[0].YMM != 10 {
		t.Fatalf("first position: got (%v,%v)", preview.Positions[0].XMM, preview.Positions[0].YMM)
	}
}

func TestPackRectangle(t *testing.T) {
	plate := model.Plate{
		WidthMM:      300,
		HeightMM:     400,
		MarginTop:    10,
		MarginRight:  10,
		MarginBottom: 10,
		MarginLeft:   10,
	}
	// 100×50 mm, trim 6 → canvas 112×62, cell 114×64, printable 280×380 → cols=2, rows=5
	spec := model.ItemSpec{WidthMM: 100, HeightMM: 50, BleedMM: 0, MarginMM: 0}
	preview := Pack(plate, spec, 2)
	if preview.Columns != 2 || preview.Rows != 5 || preview.Count != 10 {
		t.Fatalf("got %d cols, %d rows, %d count; want 2, 5, 10", preview.Columns, preview.Rows, preview.Count)
	}
	if preview.FootprintWMM != 100 || preview.FootprintHMM != 50 {
		t.Fatalf("footprint: got %.0f×%.0f want 100×50", preview.FootprintWMM, preview.FootprintHMM)
	}
}

func TestPackZeroCell(t *testing.T) {
	plate := model.Plate{WidthMM: 10, HeightMM: 10}
	spec := model.ItemSpec{SizeMM: 100}
	preview := Pack(plate, spec, 0)
	if preview.Count != 0 {
		t.Fatalf("expected 0 items, got %d", preview.Count)
	}
}