using ExperionCrawler.Core.Application.DTOs;
using ExperionCrawler.Core.Application.Services;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Xunit;

namespace ExperionCrawler.Tests;

/// <summary>
/// TextToSqlService 통합 테스트
/// task_state.md의 매핑표 기반으로 작성된 테스트 프로그램
/// </summary>
public class TextToSqlTest
{
    private readonly TextToSqlService _service;
    private readonly ILogger<TextToSqlService> _logger;

    public TextToSqlTest()
    {
        // Mock logger creation
        var loggerFactory = new LoggerFactory();
        _logger = loggerFactory.CreateLogger<TextToSqlService>();

        // Mock configuration with a dummy connection string
        var config = new Dictionary<string, string?>
        {
            { "ConnectionStrings:DefaultConnection", "Host=localhost;Port=5432;Database=iiot_platform;Username=postgres;Password=postgres" }
        };
        var configuration = new ConfigurationBuilder()
            .AddInMemoryCollection(config)
            .Build();

        _service = new TextToSqlService(_logger, configuration);
    }

    #region 1. SQL 생성 요청 → 응답 형식 검증

    [Fact]
    public void ParseNaturalLanguageAsync_WithValidInput_ReturnsValidSqlFormat()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 응답 형식 검증
        Assert.NotNull(sql);
        Assert.StartsWith("SELECT", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("FROM history_table", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("date_trunc", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("GROUP BY", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("ORDER BY", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithMaxKeyword_ReturnsMaxFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 최대값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("max", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithMinKeyword_ReturnsMinFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 최솟값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("min", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithFirstKeyword_ReturnsFirstFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 초기 값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("first", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithLastKeyword_ReturnsLastFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 마지막 값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("last", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithAvgKeyword_ReturnsAvgFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("avg", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithMultipleTags_ReturnsAllTagsInSql()
    {
        // Arrange
        var input = "p-6102.hzset.fieldvalue, ficq-6113.op 최근 2시간 값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("'p-6102.hzset.fieldvalue'", sql);
        Assert.Contains("'ficq-6113.op'", sql);
    }

    [Fact]
    public void ParseNaturalLanguageAsync_WithOpcUaNodeId_ReturnsOpcUaFormat()
    {
        // Arrange
        var input = "ns=2;s=Reactor.Temperature 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("'ns=2;s=Reactor.Temperature'", sql);
    }

    #endregion

    #region 2. 생성된 SQL 실행 → TimescaleDB 결과 반환 확인

    [Fact]
    public async Task ExecuteQueryAsync_WithValidSql_ReturnsResultWithColumnsAndRows()
    {
        // Arrange
        var sql = "SELECT date_trunc('minute', recorded_at) AS bucket, tagname, last(value::double precision, recorded_at) AS result FROM history_table WHERE tagname IN ('FICQ-6101.PV') AND recorded_at > NOW() - INTERVAL '1 hour' GROUP BY 1, 2 ORDER BY 1, 2 LIMIT 10";

        // Act
        var result = await _service.ExecuteQueryAsync(sql, 10);

        // Assert - TimescaleDB 결과 반환 확인
        Assert.True(result.Success);
        Assert.NotNull(result.Columns);
        Assert.True(result.Columns.Count > 0);
        Assert.Contains("bucket", result.Columns[0], StringComparison.OrdinalIgnoreCase);
        Assert.Contains("tagname", result.Columns[1], StringComparison.OrdinalIgnoreCase);
        Assert.Contains("result", result.Columns[2], StringComparison.OrdinalIgnoreCase);
        Assert.NotNull(result.Rows);
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithLimit_ReturnsLimitedRows()
    {
        // Arrange
        var sql = "SELECT date_trunc('minute', recorded_at) AS bucket, tagname, last(value::double precision, recorded_at) AS result FROM history_table WHERE tagname IN ('FICQ-6101.PV') AND recorded_at > NOW() - INTERVAL '1 hour' GROUP BY 1, 2 ORDER BY 1, 2";

        // Act
        var result = await _service.ExecuteQueryAsync(sql, 5);

        // Assert
        Assert.True(result.Success);
        Assert.True(result.Rows.Count <= 5);
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithInvalidSql_ReturnsError()
    {
        // Arrange
        var sql = "SELECT * FROM invalid_table_that_does_not_exist";

        // Act
        var result = await _service.ExecuteQueryAsync(sql);

        // Assert
        Assert.False(result.Success);
        Assert.NotNull(result.Error);
        Assert.Contains("PostgreSQL 오류", result.Error);
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithSqlInjectionAttempt_ReturnsError()
    {
        // Arrange
        var sql = "SELECT * FROM history_table WHERE tagname = 'FICQ-6101.PV' OR '1'='1'";

        // Act
        var result = await _service.ExecuteQueryAsync(sql);

        // Assert
        Assert.False(result.Success);
        Assert.NotNull(result.Error);
    }

    #endregion

    #region 3. 빈 입력 / 잘못된 입력 → 에러 핸들링

    [Fact]
    public async Task ParseNaturalLanguageAsync_WithEmptyInput_ThrowsArgumentException()
    {
        // Arrange & Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync(""));
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync(null!));
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync("   "));
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_WithWhitespaceOnly_ThrowsArgumentException()
    {
        // Arrange & Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync("   "));
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_WithOnlyTimeKeyword_ThrowsArgumentException()
    {
        // Arrange & Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync("최근 1시간"));
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_WithOnlyDescription_ThrowsArgumentException()
    {
        // Arrange & Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => _service.ParseNaturalLanguageAsync("온도 값"));
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithEmptySql_ThrowsException()
    {
        // Arrange
        var sql = "";

        // Act & Assert
        await Assert.ThrowsAsync<Exception>(() => _service.ExecuteQueryAsync(sql));
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithNullSql_ThrowsException()
    {
        // Arrange
        string? sql = null;

        // Act & Assert
        await Assert.ThrowsAsync<Exception>(() => _service.ExecuteQueryAsync(sql!));
    }

    [Fact]
    public async Task ExecuteQueryAsync_WithInvalidTagInSql_ReturnsError()
    {
        // Arrange
        var sql = "SELECT date_trunc('minute', recorded_at) AS bucket, tagname, last(value::double precision, recorded_at) AS result FROM history_table WHERE tagname IN ('INVALID_TAG_12345') AND recorded_at > NOW() - INTERVAL '1 hour' GROUP BY 1, 2 ORDER BY 1, 2 LIMIT 10";

        // Act
        var result = await _service.ExecuteQueryAsync(sql, 10);

        // Assert
        Assert.False(result.Success);
        Assert.NotNull(result.Error);
    }

    #endregion

    #region 4. 한국어 자연어 입력 → SQL 변환 정확도

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanRecent1Hour_ReturnsCorrectInterval()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("INTERVAL '1 hour'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanRecent24Hours_ReturnsCorrectInterval()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 24시간 최대값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("INTERVAL '24 hours'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanRecent7Days_ReturnsCorrectInterval()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 7일 최소값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("INTERVAL '7 days'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanRecent1Month_ReturnsCorrectInterval()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1개월 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("INTERVAL '30 days'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanDateRange_ReturnsTimeCondition()
    {
        // Arrange
        var input = "p-6102.hzset.fieldvalue 2026년 4월 13일 부터 4월 14일 까지";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 절대 범위 조건이 포함되어야 함
        Assert.Contains("time", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains(">=", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("AND", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("<", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanFromToPattern_ReturnsTimeCondition()
    {
        // Arrange
        var input = "FICQ-6101.PV 4월 1일 부터 4월 7일 까지 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 절대 범위 조건이 포함되어야 함
        Assert.Contains("time", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains(">=", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanAmPmRange_ReturnsTimeCondition()
    {
        // Arrange
        var input = "FICQ-6101.PV 오전 9시부터 오후 6시까지 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 절대 범위 조건이 포함되어야 함
        Assert.Contains("time", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains(">=", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("AND", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanAfterPattern_ReturnsTimeCondition()
    {
        // Arrange
        var input = "FICQ-6101.PV 오늘 오후 2시 이후 값";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 시작 시간 조건이 포함되어야 함
        Assert.Contains("time", sql, StringComparison.OrdinalIgnoreCase);
        Assert.Contains(">=", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithDescription_ExtractsOnlyTagName()
    {
        // Arrange
        var input = "temp-001 온도, pressure-002 압력 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - 한국어 설명은 제거되고 태그명만 포함되어야 함
        Assert.Contains("'temp-001'", sql);
        Assert.Contains("'pressure-002'", sql);
        Assert.DoesNotContain("온도", sql);
        Assert.DoesNotContain("압력", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithTimeKeyword_ExtractsOnlyTagName()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - "최근" 키워드는 제거되고 태그명만 포함되어야 함
        Assert.Contains("'FICQ-6101.PV'", sql);
        Assert.DoesNotContain("최근", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithTimePattern_ExtractsOnlyTagName()
    {
        // Arrange
        var input = "FICQ-6101.PV 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - "1시간" 패턴은 제거되고 태그명만 포함되어야 함
        Assert.Contains("'FICQ-6101.PV'", sql);
        Assert.DoesNotContain("1시간", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithTagKeyword_ExtractsOnlyTagName()
    {
        // Arrange
        var input = "데이터 중 aia-131.sp 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - "데이터 중" 키워드는 제거되고 태그명만 포함되어야 함
        Assert.Contains("'aia-131.sp'", sql);
        Assert.DoesNotContain("데이터", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithMiddleKeyword_ExtractsOnlyTagName()
    {
        // Arrange
        var input = "데이터 중 aia-131.sp 최근 1시간 평균";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - "중" 키워드 이후 태그명만 추출되어야 함
        Assert.Contains("'aia-131.sp'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithDotTagName_ExtractsCorrectly()
    {
        // Arrange
        var input = "p-6102.hzset.fieldvalue 2026년 4월 13일 부터 현재까지의 값 표시";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("'p-6102.hzset.fieldvalue'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithNoSpaceTagName_UsesWholeInput()
    {
        // Arrange
        var input = "FICQ-6101.PV";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("'FICQ-6101.PV'", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithNoTimeSpecified_UsesDefault()
    {
        // Arrange
        var input = "FICQ-6101.PV";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert - default time bucket should be "5 min"
        Assert.Contains("5 min", sql);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithAverageKeyword_UsesAvgFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 average";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("avg", sql, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ParseNaturalLanguageAsync_KoreanWithMaxKeyword_UsesMaxFunction()
    {
        // Arrange
        var input = "FICQ-6101.PV 최근 1시간 최대";

        // Act
        var sql = _service.ParseNaturalLanguageAsync(input).GetAwaiter().GetResult();

        // Assert
        Assert.Contains("max", sql, StringComparison.OrdinalIgnoreCase);
    }
}
    #endregion