package gio

import (
	"fmt"
	"image"
	"testing"

	"gioui.org/layout"
	"gioui.org/op"
	"gioui.org/unit"

	"softbox.local/core/application"
	"softbox.local/core/domain"
)

func TestAppShellFillsWindow(t *testing.T) {
	var operations op.Ops
	size := image.Pt(1080, 720)
	context := layout.Context{
		Ops:         &operations,
		Metric:      unit.Metric{PxPerDp: 1, PxPerSp: 1},
		Constraints: layout.Exact(size),
	}

	dimensions := NewAppShell("Modern").Layout(context, NewTheme())
	if dimensions.Size != size {
		t.Fatalf("Layout() size = %v, want %v", dimensions.Size, size)
	}
}

func TestAppShellVirtualizesLargeCatalog(t *testing.T) {
	items := make([]application.CatalogListItem, 500)
	for index := range items {
		items[index] = application.CatalogListItem{
			ID:          fmt.Sprintf("app-%03d", index),
			Name:        fmt.Sprintf("软件 %03d", index),
			Version:     "1.0.0",
			Category:    "工具",
			Tags:        []string{"工具"},
			Status:      domain.StatusNotInstalled,
			Installable: true,
		}
	}
	shell := NewAppShell("Modern", items...)
	context := testContext(image.Pt(1080, 420))

	shell.Layout(context, NewTheme())
	if shell.lastRendered <= 0 || shell.lastRendered >= len(items) {
		t.Fatalf(
			"lastRendered = %d, want visible subset of %d",
			shell.lastRendered,
			len(items),
		)
	}
}

func TestAppShellKeepsRowControlsByAppID(t *testing.T) {
	items := []application.CatalogListItem{
		{ID: "app-one", Name: "One", Version: "1.0.0", Category: "工具"},
		{ID: "app-two", Name: "Two", Version: "1.0.0", Category: "图像"},
	}
	shell := NewAppShell("Modern", items...)
	original := shell.rows["app-two"]
	shell.ApplyIcon("app-one", image.NewNRGBA(image.Rect(0, 0, 16, 16)))
	shell.ApplyIcon("app-two", image.NewNRGBA(image.Rect(0, 0, 24, 24)))

	shell.model.SetCategory("图像")
	shell.Layout(testContext(image.Pt(1080, 720)), NewTheme())
	if shell.rows["app-two"] != original {
		t.Fatal("row controls were recreated after filtering")
	}

	shell.SetItems([]application.CatalogListItem{
		{ID: "app-two", Name: "Two", Version: "1.1.0", Category: "图像"},
	})
	if shell.rows["app-two"] != original {
		t.Fatal("row controls were recreated after snapshot update")
	}
	if _, exists := shell.rows["app-one"]; exists {
		t.Fatal("removed app retained row controls")
	}
	if _, exists := shell.icons["app-one"]; exists {
		t.Fatal("removed app retained prepared icon")
	}
	icon, exists := shell.icons["app-two"]
	if !exists {
		t.Fatal("retained app lost its prepared icon")
	}
	if icon.Size() != image.Pt(24, 24) {
		t.Fatalf("retained app icon size = %v", icon.Size())
	}
}

func TestAppShellRendersSelectedDetailAndAppliedIcon(t *testing.T) {
	item := application.CatalogListItem{
		ID:          "json-parser",
		Name:        "JSON解析工具",
		Description: "格式化并检查 JSON",
		Version:     "1.2.0",
		Category:    "开发工具",
		Tags:        []string{"JSON", "格式化"},
		Homepage:    "https://example.invalid/json-parser",
		Tutorial:    "https://example.invalid/json-parser/tutorial",
		Status:      domain.StatusInstalled,
		Installed:   true,
	}
	shell := NewAppShell("Modern", item)
	icon := image.NewNRGBA(image.Rect(0, 0, 32, 32))
	shell.ApplyIcon(item.ID, icon)
	shell.model.Select(item.ID)

	shell.Layout(testContext(image.Pt(1280, 800)), NewTheme())
	if !shell.detailRendered {
		t.Fatal("selected app detail was not rendered")
	}
	if _, exists := shell.icons[item.ID]; !exists {
		t.Fatal("ApplyIcon did not retain the prepared image operation")
	}

	shell.ApplyIcon(item.ID, nil)
	if _, exists := shell.icons[item.ID]; exists {
		t.Fatal("ApplyIcon(nil) did not remove the image")
	}
}

func testContext(size image.Point) layout.Context {
	var operations op.Ops
	return layout.Context{
		Ops:         &operations,
		Metric:      unit.Metric{PxPerDp: 1, PxPerSp: 1},
		Constraints: layout.Exact(size),
	}
}