// Copyright 2024 Kelvin Clement Mwinuka
//
// 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 connection_test

import (
	"errors"
	"fmt"
	"github.com/echovault/echovault/echovault"
	"github.com/echovault/echovault/internal"
	"github.com/echovault/echovault/internal/config"
	"github.com/echovault/echovault/internal/constants"
	"github.com/tidwall/resp"
	"net"
	"strings"
	"sync"
	"testing"
)

var mockServer *echovault.EchoVault
var port int
var addr = "localhost"

func init() {
	port, _ = internal.GetFreePort()
	mockServer, _ = echovault.NewEchoVault(
		echovault.WithConfig(config.Config{
			DataDir:        "",
			EvictionPolicy: constants.NoEviction,
			BindAddr:       addr,
			Port:           uint16(port),
		}),
	)
	wg := sync.WaitGroup{}
	wg.Add(1)
	go func() {
		wg.Done()
		mockServer.Start()
	}()
	wg.Wait()
}

func Test_HandlePing(t *testing.T) {
	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", addr, port))
	if err != nil {
		t.Error(err)
		return
	}
	client := resp.NewConn(conn)

	tests := []struct {
		command     []resp.Value
		expected    string
		expectedErr error
	}{
		{
			command:     []resp.Value{resp.StringValue("PING")},
			expected:    "PONG",
			expectedErr: nil,
		},
		{
			command:     []resp.Value{resp.StringValue("PING"), resp.StringValue("Hello, world!")},
			expected:    "Hello, world!",
			expectedErr: nil,
		},
		{
			command: []resp.Value{
				resp.StringValue("PING"),
				resp.StringValue("Hello, world!"),
				resp.StringValue("Once more"),
			},
			expected:    "",
			expectedErr: errors.New(constants.WrongArgsResponse),
		},
	}

	for _, test := range tests {
		if err = client.WriteArray(test.command); err != nil {
			t.Error(err)
			return
		}

		res, _, err := client.ReadValue()
		if err != nil {
			t.Error(err)
		}

		if test.expectedErr != nil {
			if !strings.Contains(res.Error().Error(), test.expectedErr.Error()) {
				t.Errorf("expected error \"%s\", got \"%s\"", test.expectedErr.Error(), res.Error().Error())
			}
			continue
		}

		if res.String() != test.expected {
			t.Errorf("expected response \"%s\", got \"%s\"", test.expected, res.String())
		}
	}
}