//go:build plugin_rabbitmq || !plugin_selective

package services

import (
	"bytes"
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestRabbitMQManagementRejectsGenericHTTP(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_, _ = w.Write([]byte("plain http service"))
	}))
	defer server.Close()

	result := NewRabbitMQPlugin().testManagementInterface(context.Background(), hostInfoFromServer(t, server), testSession())
	if result.Success {
		t.Fatalf("testManagementInterface reported generic HTTP as RabbitMQ: %#v", result)
	}
}

func TestReadRabbitMQAMQPResponseHandlesChunkedReads(t *testing.T) {
	ok, err := readRabbitMQAMQPResponse(&chunkedByteReader{data: []byte("AMQP"), chunkSize: 1})
	if err != nil || !ok {
		t.Fatalf("readRabbitMQAMQPResponse(AMQP) = %v, %v", ok, err)
	}

	ok, err = readRabbitMQAMQPResponse(&chunkedByteReader{data: []byte{0x01, 0, 0, 0, 0, 0, 0, 0}, chunkSize: 2})
	if err != nil || !ok {
		t.Fatalf("readRabbitMQAMQPResponse(frame) = %v, %v", ok, err)
	}

	ok, err = readRabbitMQAMQPResponse(bytes.NewReader([]byte{0x01, 0, 0}))
	if err == nil || ok {
		t.Fatalf("readRabbitMQAMQPResponse(short) = %v, %v; want short read error", ok, err)
	}
}

type chunkedByteReader struct {
	data      []byte
	chunkSize int
}

func (r *chunkedByteReader) Read(p []byte) (int, error) {
	if len(r.data) == 0 {
		return 0, io.EOF
	}
	n := len(r.data)
	if r.chunkSize > 0 && n > r.chunkSize {
		n = r.chunkSize
	}
	if n > len(p) {
		n = len(p)
	}
	copy(p, r.data[:n])
	r.data = r.data[n:]
	return n, nil
}

func TestClassifyRabbitMQErrorType(t *testing.T) {
	tests := []struct {
		name string
		err  error
		want ErrorType
	}{
		{"nil", nil, ErrorTypeUnknown},
		{"authentication failed", errors.New("authentication failed"), ErrorTypeAuth},
		{"401 unauthorized", errors.New("401 unauthorized"), ErrorTypeAuth},
		{"connection refused", errors.New("connection refused"), ErrorTypeNetwork},
		{"unknown", errors.New("random rabbitmq error"), ErrorTypeUnknown},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := classifyRabbitMQErrorType(tt.err); got != tt.want {
				t.Errorf("classifyRabbitMQErrorType() = %v, want %v", got, tt.want)
			}
		})
	}
}