using System.Diagnostics;
using Microsoft.Extensions.Logging;

namespace Managing.Infrastructure.Databases.PostgreSql;

/// <summary>
/// Base repository class with comprehensive SQL query logging and monitoring
/// Provides automatic query tracking, loop detection, and performance monitoring
/// </summary>
public abstract class BaseRepositoryWithLogging
{
    protected readonly ManagingDbContext _context;
    protected readonly ILogger<SqlQueryLogger> _logger;
    protected readonly SentrySqlMonitoringService _sentryMonitoringService;
    protected readonly string _repositoryName;

    protected BaseRepositoryWithLogging(ManagingDbContext context, ILogger<SqlQueryLogger> logger, SentrySqlMonitoringService sentryMonitoringService)
    {
        _context = context;
        _logger = logger;
        _sentryMonitoringService = sentryMonitoringService;
        _repositoryName = GetType().Name;
    }

    /// <summary>
    /// Executes a database operation with lightweight logging and monitoring
    /// Only logs slow queries (>2000ms) and errors to minimize performance impact
    /// </summary>
    /// <typeparam name="T">Return type of the operation</typeparam>
    /// <param name="operation">The database operation to execute</param>
    /// <param name="methodName">Name of the calling method</param>
    /// <param name="parameters">Parameters passed to the operation</param>
    /// <returns>Result of the operation</returns>
    protected async Task<T> ExecuteWithLoggingAsync<T>(
        Func<Task<T>> operation, 
        string methodName, 
        params (string name, object value)[] parameters)
    {
        // Check if monitoring is enabled globally
        if (!_sentryMonitoringService.IsMonitoringEnabled())
        {
            return await operation();
        }

        var stopwatch = Stopwatch.StartNew();
        var queryPattern = GenerateQueryPattern(methodName, parameters);
        
        try
        {
            var result = await operation();
            stopwatch.Stop();
            
            // Only log if it should be logged based on monitoring settings (respects LogSlowQueriesOnly and thresholds)
            if (_sentryMonitoringService.ShouldLogQuery(stopwatch.Elapsed))
            {
                _logger.LogWarning(
                    "[SLOW-SQL] {Repository}.{Method} | Pattern: {Pattern} | Time: {Time}ms",
                    _repositoryName, methodName, queryPattern, stopwatch.Elapsed.TotalMilliseconds);
                
                // Send slow query alert to Sentry asynchronously if enabled
                if (_sentryMonitoringService.IsSentryEnabled())
                {
                    _ = Task.Run(() => SendSlowQueryToSentryAsync(queryPattern, stopwatch.Elapsed, methodName));
                }
            }
            
            // Track query execution for loop detection if enabled (minimal overhead)
            if (_sentryMonitoringService.IsLoopDetectionEnabled())
            {
                _context.TrackQueryExecution(queryPattern, stopwatch.Elapsed, _repositoryName, methodName);
            }
            
            return result;
        }
        catch (Exception ex)
        {
            stopwatch.Stop();
            
            // Always log errors if logging is enabled
            if (_sentryMonitoringService.IsLoggingEnabled())
            {
                _logger.LogError(ex, 
                    "[SQL-ERROR] {Repository}.{Method} | Pattern: {Pattern} | Time: {Time}ms",
                    _repositoryName, methodName, queryPattern, stopwatch.Elapsed.TotalMilliseconds);
            }
            
            // Send SQL error to Sentry asynchronously if enabled
            if (_sentryMonitoringService.IsSentryEnabled())
            {
                _ = Task.Run(() => SendSqlErrorToSentryAsync(queryPattern, stopwatch.Elapsed, ex, methodName));
            }
            
            throw;
        }
    }

    /// <summary>
    /// Executes a database operation with lightweight logging and monitoring (void return)
    /// Only logs slow queries (>2000ms) and errors to minimize performance impact
    /// </summary>
    /// <param name="operation">The database operation to execute</param>
    /// <param name="methodName">Name of the calling method</param>
    /// <param name="parameters">Parameters passed to the operation</param>
    protected async Task ExecuteWithLoggingAsync(
        Func<Task> operation, 
        string methodName, 
        params (string name, object value)[] parameters)
    {
        // Check if monitoring is enabled globally
        if (!_sentryMonitoringService.IsMonitoringEnabled())
        {
            await operation();
            return;
        }

        var stopwatch = Stopwatch.StartNew();
        var queryPattern = GenerateQueryPattern(methodName, parameters);
        
        try
        {
            await operation();
            stopwatch.Stop();
            
            // Only log if it should be logged based on monitoring settings (respects LogSlowQueriesOnly and thresholds)
            if (_sentryMonitoringService.ShouldLogQuery(stopwatch.Elapsed))
            {
                _logger.LogWarning(
                    "[SLOW-SQL] {Repository}.{Method} | Pattern: {Pattern} | Time: {Time}ms",
                    _repositoryName, methodName, queryPattern, stopwatch.Elapsed.TotalMilliseconds);
                
                // Send slow query alert to Sentry asynchronously if enabled
                if (_sentryMonitoringService.IsSentryEnabled())
                {
                    _ = Task.Run(() => SendSlowQueryToSentryAsync(queryPattern, stopwatch.Elapsed, methodName));
                }
            }
            
            // Track query execution for loop detection if enabled (minimal overhead)
            if (_sentryMonitoringService.IsLoopDetectionEnabled())
            {
                _context.TrackQueryExecution(queryPattern, stopwatch.Elapsed, _repositoryName, methodName);
            }
        }
        catch (Exception ex)
        {
            stopwatch.Stop();
            
            // Always log errors if logging is enabled
            if (_sentryMonitoringService.IsLoggingEnabled())
            {
                _logger.LogError(ex, 
                    "[SQL-ERROR] {Repository}.{Method} | Pattern: {Pattern} | Time: {Time}ms",
                    _repositoryName, methodName, queryPattern, stopwatch.Elapsed.TotalMilliseconds);
            }
            
            // Send SQL error to Sentry asynchronously if enabled
            if (_sentryMonitoringService.IsSentryEnabled())
            {
                _ = Task.Run(() => SendSqlErrorToSentryAsync(queryPattern, stopwatch.Elapsed, ex, methodName));
            }
            
            throw;
        }
    }

    /// <summary>
    /// Generates a query pattern for tracking purposes
    /// </summary>
    /// <param name="methodName">Name of the method</param>
    /// <param name="parameters">Method parameters</param>
    /// <returns>Query pattern string</returns>
    private string GenerateQueryPattern(string methodName, (string name, object value)[] parameters)
    {
        var paramStrings = parameters.Select(p => $"{p.name}={p.value?.GetType().Name ?? "null"}");
        return $"{methodName}({string.Join(",", paramStrings)})";
    }

    /// <summary>
    /// Logs a potential performance issue
    /// </summary>
    /// <param name="operation">Operation description</param>
    /// <param name="duration">Operation duration</param>
    /// <param name="threshold">Performance threshold</param>
    protected void LogPerformanceIssue(string operation, TimeSpan duration, TimeSpan threshold)
    {
        if (duration > threshold)
        {
            _logger.LogWarning(
                "[SQL-PERFORMANCE] {Repository} | {Operation} took {Duration}ms (threshold: {Threshold}ms)",
                _repositoryName, operation, duration.TotalMilliseconds, threshold.TotalMilliseconds);
        }
    }

    /// <summary>
    /// Sends slow query alert to Sentry asynchronously (fire and forget)
    /// </summary>
    private async Task SendSlowQueryToSentryAsync(string queryPattern, TimeSpan executionTime, string methodName)
    {
        try
        {
            await _sentryMonitoringService.SendSlowQueryAlertAsync(_repositoryName, methodName, queryPattern, executionTime);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "[SENTRY-ERROR] Failed to send slow query alert to Sentry");
        }
    }

    /// <summary>
    /// Sends SQL error to Sentry asynchronously (fire and forget)
    /// </summary>
    private async Task SendSqlErrorToSentryAsync(string queryPattern, TimeSpan executionTime, Exception exception, string methodName)
    {
        try
        {
            await _sentryMonitoringService.SendSqlErrorAlertAsync(_repositoryName, methodName, queryPattern, executionTime, exception);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "[SENTRY-ERROR] Failed to send SQL error alert to Sentry");
        }
    }
}