package systemconfig

import "testing"

func TestNormalizeHomeBannersMigratesLegacyImageURL(t *testing.T) {
	items := normalizeHomeBanners([]HomeBannerItem{
		{Title: "旧结构", ImageURL: "  https://cdn.example/legacy.png  "},
	})
	if len(items) != 1 {
		t.Fatalf("期望保留 1 条轮播，实际 %d", len(items))
	}
	if items[0].PC.ImageURL != "https://cdn.example/legacy.png" {
		t.Fatalf("旧图未迁移到 PC 端：%q", items[0].PC.ImageURL)
	}
	if items[0].Mobile.ImageURL != "https://cdn.example/legacy.png" {
		t.Fatalf("旧图未迁移到移动端：%q", items[0].Mobile.ImageURL)
	}
	if items[0].ImageURL != "" {
		t.Fatalf("旧字段应被清空，实际 %q", items[0].ImageURL)
	}
}

func TestNormalizeHomeBannersKeepsPerPlatformVisual(t *testing.T) {
	items := normalizeHomeBanners([]HomeBannerItem{{
		Title:  "两端分图",
		PC:     HomeBannerVisual{ImageURL: " https://cdn.example/pc.png "},
		Mobile: HomeBannerVisual{ImageURL: " https://cdn.example/mobile.png "},
	}})
	if items[0].PC.ImageURL != "https://cdn.example/pc.png" {
		t.Fatalf("PC 图被改动：%q", items[0].PC.ImageURL)
	}
	if items[0].Mobile.ImageURL != "https://cdn.example/mobile.png" {
		t.Fatalf("移动端图被改动：%q", items[0].Mobile.ImageURL)
	}
}

func TestNormalizeHomeBannersClampsHotspots(t *testing.T) {
	items := normalizeHomeBanners([]HomeBannerItem{{
		Title: "热区",
		PC: HomeBannerVisual{Hotspots: []HomeBannerHotspot{
			{ID: " h1 ", X: 90, Y: 95, Width: 20, Height: 20, Action: HomeBannerAction{Type: "route", Target: " /listings "}},
			{ID: "zero", Width: 0, Height: 10, Action: HomeBannerAction{Type: "route", Target: "/x"}},
		}},
	}})
	hotspots := items[0].PC.Hotspots
	if len(hotspots) != 1 {
		t.Fatalf("宽高为 0 的热区应被丢弃，剩余 %d 个", len(hotspots))
	}
	if hotspots[0].ID != "h1" || hotspots[0].X != 80 || hotspots[0].Y != 80 {
		t.Fatalf("热区未收敛到合法范围：%+v", hotspots[0])
	}
	if hotspots[0].Action.Type != "route" || hotspots[0].Action.Target != "/listings" {
		t.Fatalf("热区跳转未归一化：%+v", hotspots[0].Action)
	}
}

func TestNormalizeHomeBannersHotspotImageAndHoverScale(t *testing.T) {
	items := normalizeHomeBanners([]HomeBannerItem{{
		Title: "热区按钮图",
		PC: HomeBannerVisual{Hotspots: []HomeBannerHotspot{
			{ID: "a", Width: 10, Height: 10, ImageURL: "  https://cdn.example/btn.png  "},
			{ID: "b", Width: 10, Height: 10, HoverScale: 9},
			{ID: "c", Width: 10, Height: 10, HoverScale: 0.5},
		}},
	}})
	hotspots := items[0].PC.Hotspots
	if hotspots[0].ImageURL != "https://cdn.example/btn.png" {
		t.Fatalf("热区按钮图未清理空白：%q", hotspots[0].ImageURL)
	}
	if hotspots[0].HoverScale != defaultBannerHotspotHoverScale {
		t.Fatalf("未配置悬浮倍数应回落默认值，实际 %v", hotspots[0].HoverScale)
	}
	if hotspots[1].HoverScale != maxBannerHotspotHoverScale {
		t.Fatalf("超上限的悬浮倍数应被收敛，实际 %v", hotspots[1].HoverScale)
	}
	if hotspots[2].HoverScale != 1 {
		t.Fatalf("小于 1 的悬浮倍数应收敛为 1，实际 %v", hotspots[2].HoverScale)
	}
}

func TestNormalizeBannerActionFallsBackToNone(t *testing.T) {
	cases := []struct {
		name   string
		input  HomeBannerAction
		expect HomeBannerAction
	}{
		{
			name:   "缺失目标的站内跳转退化为不跳转",
			input:  HomeBannerAction{Type: "route", Target: "  "},
			expect: HomeBannerAction{Type: "none"},
		},
		{
			name:   "未知类型退化为不跳转",
			input:  HomeBannerAction{Type: "unknown", Target: "/x"},
			expect: HomeBannerAction{Type: "none"},
		},
		{
			name:   "查看大图不保留目标与新窗口",
			input:  HomeBannerAction{Type: "preview", Target: "/x", OpenNewTab: true},
			expect: HomeBannerAction{Type: "preview"},
		},
		{
			name:   "外链保留新窗口标记",
			input:  HomeBannerAction{Type: "link", Target: " https://cdn.example/a ", OpenNewTab: true},
			expect: HomeBannerAction{Type: "link", Target: "https://cdn.example/a", OpenNewTab: true},
		},
	}
	for _, testCase := range cases {
		t.Run(testCase.name, func(t *testing.T) {
			if got := normalizeBannerAction(testCase.input); got != testCase.expect {
				t.Fatalf("期望 %+v，实际 %+v", testCase.expect, got)
			}
		})
	}
}

func TestNormalizeHomeBannersFallsBackToDefaults(t *testing.T) {
	items := normalizeHomeBanners([]HomeBannerItem{{Title: "  "}})
	if len(items) != len(defaultHomeBanners()) {
		t.Fatalf("全部无效时应回落默认轮播，实际 %d 条", len(items))
	}
}