// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package common_test

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"path/filepath"
	"testing"

	"github.com/pingcap/tidb/pkg/lightning/common"
	"github.com/stretchr/testify/require"
	pd "github.com/tikv/pd/client/http"
)

func respondPathHandler(w http.ResponseWriter, req *http.Request) {
	_, _ = io.WriteString(w, `{"path":"`)
	_, _ = io.WriteString(w, req.URL.Path)
	_, _ = io.WriteString(w, `"}`)
}

func TestGetJSONInsecure(t *testing.T) {
	mockServer := httptest.NewServer(http.HandlerFunc(respondPathHandler))
	defer mockServer.Close()

	ctx := context.Background()
	u, err := url.Parse(mockServer.URL)
	require.NoError(t, err)

	tls, err := common.NewTLS("", "", "", u.Host, nil, nil, nil)
	require.NoError(t, err)

	var result struct{ Path string }
	err = tls.GetJSON(ctx, "/aaa", &result)
	require.NoError(t, err)
	require.Equal(t, "/aaa", result.Path)
	err = tls.GetJSON(ctx, "/bbbb", &result)
	require.NoError(t, err)
	require.Equal(t, "/bbbb", result.Path)
}

func TestGetJSONSecure(t *testing.T) {
	mockServer := httptest.NewTLSServer(http.HandlerFunc(respondPathHandler))
	defer mockServer.Close()

	ctx := context.Background()
	tls := common.NewTLSFromMockServer(mockServer)

	var result struct{ Path string }
	err := tls.GetJSON(ctx, "/ccc", &result)
	require.NoError(t, err)
	require.Equal(t, "/ccc", result.Path)
	err = tls.GetJSON(ctx, "/dddd", &result)
	require.NoError(t, err)
	require.Equal(t, "/dddd", result.Path)
}

func TestWithHost(t *testing.T) {
	mockTLSServer := httptest.NewTLSServer(http.HandlerFunc(respondPathHandler))
	defer mockTLSServer.Close()
	mockServer := httptest.NewServer(http.HandlerFunc(respondPathHandler))
	defer mockServer.Close()

	testCases := []struct {
		expected string
		host     string
		secure   bool
	}{
		{
			"https://127.0.0.1:2379",
			"http://127.0.0.1:2379",
			true,
		},
		{
			"http://127.0.0.1:2379",
			"https://127.0.0.1:2379",
			false,
		},
		{
			fmt.Sprintf("http://127.0.0.1:2379%s", pd.Stores),
			fmt.Sprintf("127.0.0.1:2379%s", pd.Stores),
			false,
		},
		{
			"https://127.0.0.1:2379",
			"127.0.0.1:2379",
			true,
		},
	}

	for _, testCase := range testCases {
		server := mockServer
		if testCase.secure {
			server = mockTLSServer
		}
		tls := common.NewTLSFromMockServer(server)
		require.Equal(t, testCase.expected, common.GetMockTLSUrl(tls.WithHost(testCase.host)))
	}
}

func TestInvalidTLS(t *testing.T) {
	tempDir := t.TempDir()
	caPath := filepath.Join(tempDir, "ca.pem")

	caContent := []byte(`-----BEGIN CERTIFICATE-----
MIIBITCBxwIUf04/Hucshr7AynmgF8JeuFUEf9EwCgYIKoZIzj0EAwIwEzERMA8G
A1UEAwwIYnJfdGVzdHMwHhcNMjIwNDEzMDcyNDQxWhcNMjIwNDE1MDcyNDQxWjAT
MREwDwYDVQQDDAhicl90ZXN0czBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABL+X
wczUg0AbaFFaCI+FAk3K9vbB9JeIORgGKS+F1TKip5tvm96g7S5lq8SgY38SXVc3
0yS3YqWZqnRjWi+sLwIwCgYIKoZIzj0EAwIDSQAwRgIhAJcpSwsUhqkM08LK1gYC
ze4ZnCkwJdP2VdpI3WZsoI7zAiEAjP8X1c0iFwYxdAbQAveX+9msVrzyUpZOohi4
RtgQTNI=
-----END CERTIFICATE-----
`)
	err := os.WriteFile(caPath, caContent, 0o644)
	require.NoError(t, err)

	certPath := filepath.Join(tempDir, "test.pem")
	keyPath := filepath.Join(tempDir, "test.key")

	certContent := []byte("invalid cert content")
	err = os.WriteFile(certPath, certContent, 0o644)
	require.NoError(t, err)
	keyContent := []byte("invalid key content")
	err = os.WriteFile(keyPath, keyContent, 0o600)
	require.NoError(t, err)
	_, err = common.NewTLS(caPath, "", "", "localhost", caContent, certContent, keyContent)
	require.ErrorContains(t, err, "tls: failed to find any PEM data in certificate input")
}