package imgcache

import (
	"net/url"
	"testing"
)

func TestHostWhitelist_IsWhitelisted(t *testing.T) {
	tests := []struct {
		name     string
		patterns []string
		testURL  string
		want     bool
	}{
		{
			name:     "exact match",
			patterns: []string{"cdn.example.com"},
			testURL:  "https://cdn.example.com/image.jpg",
			want:     true,
		},
		{
			name:     "exact match case insensitive",
			patterns: []string{"CDN.Example.COM"},
			testURL:  "https://cdn.example.com/image.jpg",
			want:     true,
		},
		{
			name:     "exact match not found",
			patterns: []string{"cdn.example.com"},
			testURL:  "https://other.example.com/image.jpg",
			want:     false,
		},
		{
			name:     "suffix match",
			patterns: []string{".example.com"},
			testURL:  "https://cdn.example.com/image.jpg",
			want:     true,
		},
		{
			name:     "suffix match deep subdomain",
			patterns: []string{".example.com"},
			testURL:  "https://cdn.images.example.com/image.jpg",
			want:     true,
		},
		{
			name:     "suffix match apex domain",
			patterns: []string{".example.com"},
			testURL:  "https://example.com/image.jpg",
			want:     true,
		},
		{
			name:     "suffix match not found",
			patterns: []string{".example.com"},
			testURL:  "https://notexample.com/image.jpg",
			want:     false,
		},
		{
			name:     "suffix match partial not allowed",
			patterns: []string{".example.com"},
			testURL:  "https://fakeexample.com/image.jpg",
			want:     false,
		},
		{
			name:     "multiple patterns",
			patterns: []string{"cdn.example.com", ".images.org", "static.test.net"},
			testURL:  "https://photos.images.org/image.jpg",
			want:     true,
		},
		{
			name:     "empty whitelist",
			patterns: []string{},
			testURL:  "https://cdn.example.com/image.jpg",
			want:     false,
		},
		{
			name:     "nil url",
			patterns: []string{"cdn.example.com"},
			testURL:  "",
			want:     false,
		},
		{
			name:     "url with port",
			patterns: []string{"cdn.example.com"},
			testURL:  "https://cdn.example.com:443/image.jpg",
			want:     true,
		},
		{
			name:     "whitespace in patterns",
			patterns: []string{"  cdn.example.com  ", "  .other.com  "},
			testURL:  "https://cdn.example.com/image.jpg",
			want:     true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := NewHostWhitelist(tt.patterns)

			var u *url.URL
			if tt.testURL != "" {
				var err error
				u, err = url.Parse(tt.testURL)
				if err != nil {
					t.Fatalf("failed to parse test URL: %v", err)
				}
			}

			got := w.IsWhitelisted(u)
			if got != tt.want {
				t.Errorf("IsWhitelisted() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestHostWhitelist_IsEmpty(t *testing.T) {
	tests := []struct {
		name     string
		patterns []string
		want     bool
	}{
		{
			name:     "empty",
			patterns: []string{},
			want:     true,
		},
		{
			name:     "nil",
			patterns: nil,
			want:     true,
		},
		{
			name:     "whitespace only",
			patterns: []string{"  ", ""},
			want:     true,
		},
		{
			name:     "has entries",
			patterns: []string{"example.com"},
			want:     false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := NewHostWhitelist(tt.patterns)
			if got := w.IsEmpty(); got != tt.want {
				t.Errorf("IsEmpty() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestHostWhitelist_Count(t *testing.T) {
	tests := []struct {
		name     string
		patterns []string
		want     int
	}{
		{
			name:     "empty",
			patterns: []string{},
			want:     0,
		},
		{
			name:     "exact hosts only",
			patterns: []string{"a.com", "b.com", "c.com"},
			want:     3,
		},
		{
			name:     "suffix hosts only",
			patterns: []string{".a.com", ".b.com"},
			want:     2,
		},
		{
			name:     "mixed",
			patterns: []string{"exact.com", ".suffix.com"},
			want:     2,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := NewHostWhitelist(tt.patterns)
			if got := w.Count(); got != tt.want {
				t.Errorf("Count() = %v, want %v", got, tt.want)
			}
		})
	}
}