// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package uri

import (
	"encoding/json"
	"testing"

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

func TestParse(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name    string
		input   string
		want    URI
		wantErr bool
	}{
		{
			name:  "valid https url",
			input: "https://example.com",
			want:  URI("https://example.com"),
		},
		{
			name:  "valid https url with path",
			input: "https://example.com/callback",
			want:  URI("https://example.com/callback"),
		},
		{
			name:  "valid https url with port",
			input: "https://localhost:8080/callback",
			want:  URI("https://localhost:8080/callback"),
		},
		{
			name:  "valid http url",
			input: "http://localhost:3000/auth/callback",
			want:  URI("http://localhost:3000/auth/callback"),
		},
		{
			name:  "valid url with query",
			input: "https://example.com/path?key=value",
			want:  URI("https://example.com/path?key=value"),
		},
		{
			name:  "valid custom scheme",
			input: "myapp://callback",
			want:  URI("myapp://callback"),
		},
		{
			name:    "empty string",
			input:   "",
			wantErr: true,
		},
		{
			name:    "no scheme",
			input:   "example.com/callback",
			wantErr: true,
		},
		{
			name:    "no host",
			input:   "/callback",
			wantErr: true,
		},
		{
			name:    "relative path",
			input:   "callback",
			wantErr: true,
		},
		{
			name:    "scheme only",
			input:   "https://",
			wantErr: true,
		},
	}

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

				got, err := Parse(tt.input)
				if tt.wantErr {
					require.Error(t, err)
					return
				}

				require.NoError(t, err)
				assert.Equal(t, tt.want, got)
			},
		)
	}
}

func TestURIIsHTTP(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		uri  URI
		want bool
	}{
		{name: "https", uri: URI("https://example.com"), want: true},
		{name: "http", uri: URI("http://localhost:3000"), want: true},
		{name: "custom scheme", uri: URI("myapp://callback"), want: false},
		{name: "javascript scheme", uri: URI("javascript://example.com/%0Aalert(1)"), want: false},
	}

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

				assert.Equal(t, tt.want, tt.uri.IsHTTP())
			},
		)
	}
}

func TestURIUnmarshalText(t *testing.T) {
	t.Parallel()

	t.Run(
		"valid",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.UnmarshalText([]byte("https://example.com/callback"))
			require.NoError(t, err)
			assert.Equal(t, URI("https://example.com/callback"), u)
		},
	)

	t.Run(
		"invalid",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.UnmarshalText([]byte("not-a-url"))
			require.Error(t, err)
		},
	)
}

func TestURIMarshalText(t *testing.T) {
	t.Parallel()

	u := URI("https://example.com/callback")
	b, err := u.MarshalText()
	require.NoError(t, err)
	assert.Equal(t, []byte("https://example.com/callback"), b)
}

func TestURIJSON(t *testing.T) {
	t.Parallel()

	t.Run(
		"marshal",
		func(t *testing.T) {
			t.Parallel()

			v := struct {
				URL URI `json:"url"`
			}{URL: URI("https://example.com")}

			data, err := json.Marshal(v)
			require.NoError(t, err)
			assert.JSONEq(t, `{"url":"https://example.com"}`, string(data))
		},
	)

	t.Run(
		"unmarshal valid",
		func(t *testing.T) {
			t.Parallel()

			var v struct {
				URL URI `json:"url"`
			}

			err := json.Unmarshal([]byte(`{"url":"https://example.com"}`), &v)
			require.NoError(t, err)
			assert.Equal(t, URI("https://example.com"), v.URL)
		},
	)

	t.Run(
		"unmarshal invalid",
		func(t *testing.T) {
			t.Parallel()

			var v struct {
				URL URI `json:"url"`
			}

			err := json.Unmarshal([]byte(`{"url":"not-a-url"}`), &v)
			require.Error(t, err)
		},
	)
}

func TestURIScan(t *testing.T) {
	t.Parallel()

	t.Run(
		"string",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.Scan("https://example.com")
			require.NoError(t, err)
			assert.Equal(t, URI("https://example.com"), u)
		},
	)

	t.Run(
		"bytes",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.Scan([]byte("https://example.com"))
			require.NoError(t, err)
			assert.Equal(t, URI("https://example.com"), u)
		},
	)

	t.Run(
		"invalid value",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.Scan("not-a-url")
			require.Error(t, err)
		},
	)

	t.Run(
		"unsupported type",
		func(t *testing.T) {
			t.Parallel()

			var u URI

			err := u.Scan(123)
			require.Error(t, err)
		},
	)
}

func TestURIValue(t *testing.T) {
	t.Parallel()

	u := URI("https://example.com")
	v, err := u.Value()
	require.NoError(t, err)
	assert.Equal(t, "https://example.com", v)
}

func TestExtractDomain(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name   string
		rawURL string
		want   string
	}{
		{"google tag manager", "https://www.googletagmanager.com/gtag/js?id=G-ABC123", "googletagmanager.com"},
		{"google analytics", "https://www.google-analytics.com/analytics.js", "google-analytics.com"},
		{"facebook pixel", "https://connect.facebook.net/en_US/fbevents.js", "facebook.net"},
		{"segment cdn", "https://cdn.segment.io/v1/projects/abc/settings", "segment.io"},
		{"hubspot", "https://js.hs-analytics.net/analytics/1234/abc.js", "hs-analytics.net"},
		{"subdomain stripped", "https://static.ads.example.com/pixel.js", "example.com"},
		{"co.uk tld", "https://tracker.example.co.uk/script.js", "example.co.uk"},
		{"bare domain no path", "https://doubleclick.net", "doubleclick.net"},
		{"case insensitive", "https://WWW.GoogleTagManager.COM/gtag/js", "googletagmanager.com"},
		{"empty string", "", ""},
		{"invalid url", "not a url at all", ""},
		{"data uri", "data:text/html,<h1>Hello</h1>", ""},
		{"ip address", "https://192.168.1.1/script.js", ""},
		{"port number", "https://tracker.example.com:8443/pixel.js", "example.com"},
		{"http scheme", "http://cdn.jsdelivr.net/npm/cookieconsent", "jsdelivr.net"},
	}

	for _, tt := range tests {
		t.Run(
			tt.name,
			func(t *testing.T) {
				t.Parallel()
				assert.Equal(t, tt.want, ExtractDomain(tt.rawURL))
			},
		)
	}
}

func TestDomainLabel(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		raw  string
		want string
	}{
		{"bare domain", "cookiedatabase.org", "cookiedatabase"},
		{"domain with www", "www.cookiedatabase.org", "cookiedatabase"},
		{"full url", "https://www.cookiedatabase.org/list", "cookiedatabase"},
		{"url with query", "https://cookifi.com/?ref=x", "cookifi"},
		{"host with port", "cookieserve.com:8443", "cookieserve"},
		{"co.uk tld", "https://www.cookiepedia.co.uk/list", "cookiepedia"},
		{"uppercase", "CookieDatabase.ORG", "cookiedatabase"},
		{"surrounding spaces", "  cookifi.com  ", "cookifi"},
		{"bare brand no suffix", "Cookiepedia", ""},
		{"empty string", "", ""},
	}

	for _, tt := range tests {
		t.Run(
			tt.name,
			func(t *testing.T) {
				t.Parallel()
				assert.Equal(t, tt.want, DomainLabel(tt.raw))
			},
		)
	}
}

func TestFilterFirstPartyDomains(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name       string
		domains    []string
		siteOrigin string
		want       []string
	}{
		{
			name:       "removes site domain from proxy",
			domains:    []string{"probo.com", "posthog.com"},
			siteOrigin: "https://app.probo.com",
			want:       []string{"posthog.com"},
		},
		{
			name:       "keeps all third-party domains",
			domains:    []string{"stripe.com", "google.com"},
			siteOrigin: "https://app.probo.com",
			want:       []string{"stripe.com", "google.com"},
		},
		{
			name:       "removes only matching domain",
			domains:    []string{"example.com", "googletagmanager.com", "example.com"},
			siteOrigin: "https://www.example.com",
			want:       []string{"googletagmanager.com"},
		},
		{
			name:       "all domains are first party",
			domains:    []string{"probo.com"},
			siteOrigin: "https://t.probo.com",
			want:       []string{},
		},
		{
			name:       "empty domains list",
			domains:    []string{},
			siteOrigin: "https://probo.com",
			want:       []string{},
		},
		{
			name:       "nil domains list",
			domains:    nil,
			siteOrigin: "https://probo.com",
			want:       []string{},
		},
		{
			name:       "invalid site origin preserves all",
			domains:    []string{"probo.com", "stripe.com"},
			siteOrigin: "not-a-url",
			want:       []string{"probo.com", "stripe.com"},
		},
		{
			name:       "empty site origin preserves all",
			domains:    []string{"probo.com", "stripe.com"},
			siteOrigin: "",
			want:       []string{"probo.com", "stripe.com"},
		},
		{
			name:       "co.uk site origin",
			domains:    []string{"example.co.uk", "analytics.google.com"},
			siteOrigin: "https://shop.example.co.uk",
			want:       []string{"analytics.google.com"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			assert.Equal(t, tt.want, FilterFirstPartyDomains(tt.domains, tt.siteOrigin))
		})
	}
}

func TestFilterSharedInfrastructureDomains(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name    string
		domains []string
		want    []string
	}{
		{
			name:    "removes tag manager domain",
			domains: []string{"googletagmanager.com", "posthog.com"},
			want:    []string{"posthog.com"},
		},
		{
			name:    "removes generic cdn domain",
			domains: []string{"cloudfront.net", "hotjar.com"},
			want:    []string{"hotjar.com"},
		},
		{
			name:    "keeps vendor-specific domains",
			domains: []string{"google-analytics.com", "stripe.com"},
			want:    []string{"google-analytics.com", "stripe.com"},
		},
		{
			name:    "case insensitive match",
			domains: []string{"GoogleTagManager.com", "Segment.IO"},
			want:    []string{},
		},
		{
			name:    "mixed infra and vendor",
			domains: []string{"gstatic.com", "doubleclick.net", "jsdelivr.net"},
			want:    []string{"doubleclick.net"},
		},
		{
			name:    "empty domains list",
			domains: []string{},
			want:    []string{},
		},
		{
			name:    "nil domains list",
			domains: nil,
			want:    []string{},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			assert.Equal(t, tt.want, FilterSharedInfrastructureDomains(tt.domains))
		})
	}
}