using GreenHome.Application;
using Microsoft.EntityFrameworkCore;

namespace GreenHome.Infrastructure;

public sealed class MonthlyReportService : IMonthlyReportService
{
    private readonly GreenHomeDbContext _context;

    public MonthlyReportService(GreenHomeDbContext context)
    {
        _context = context;
    }

    public async Task<MonthlyReportDto> GetMonthlyReportAsync(
        int deviceId,
        int year,
        int month,
        CancellationToken cancellationToken)
    {
        var device = await _context.Devices
            .FirstOrDefaultAsync(d => d.Id == deviceId, cancellationToken);

        if (device == null)
        {
            throw new InvalidOperationException($"دستگاه با شناسه {deviceId} یافت نشد");
        }

        // Get alert logs for the month
        var alertLogs = await _context.AlertLogs
            .Where(al => al.DeviceId == deviceId &&
                        al.SentAt.Year == year &&
                        al.SentAt.Month == month)
            .ToListAsync(cancellationToken);

        var totalAlerts = alertLogs.Count;
        var smsAlerts = alertLogs.Count(al => al.NotificationType == Domain.AlertNotificationType.SMS);
        var callAlerts = alertLogs.Count(al => al.NotificationType == Domain.AlertNotificationType.Call);
        var successfulAlerts = alertLogs.Count(al => al.Status == Domain.AlertStatus.Success);
        var failedAlerts = alertLogs.Count(al => al.Status == Domain.AlertStatus.Failed);
        var powerOutageAlerts = alertLogs.Count(al => al.AlertType == Domain.AlertType.PowerOutage);

        // Get telemetry statistics
        var telemetryData = await _context.TelemetryRecords
            .Where(t => t.DeviceId == deviceId &&
                       t.PersianYear == year &&
                       t.PersianMonth == month)
            .ToListAsync(cancellationToken);

        var totalTelemetryRecords = telemetryData.Count;
        var avgTemp = telemetryData.Any() ? telemetryData.Average(t => t.TemperatureC) : 0;
        var minTemp = telemetryData.Any() ? telemetryData.Min(t => t.TemperatureC) : 0;
        var maxTemp = telemetryData.Any() ? telemetryData.Max(t => t.TemperatureC) : 0;
        var avgHumidity = telemetryData.Any() ? telemetryData.Average(t => t.HumidityPercent) : 0;
        var minHumidity = telemetryData.Any() ? telemetryData.Min(t => t.HumidityPercent) : 0;
        var maxHumidity = telemetryData.Any() ? telemetryData.Max(t => t.HumidityPercent) : 0;
        var avgLux = telemetryData.Any() ? telemetryData.Average(t => t.Lux) : 0;
        var avgGas = telemetryData.Any() ? (int)telemetryData.Average(t => t.GasPPM) : 0;
        var maxGas = telemetryData.Any() ? telemetryData.Max(t => t.GasPPM) : 0;

        // Get user activity
        var userReportsCount = await _context.UserDailyReports
            .CountAsync(r => r.DeviceId == deviceId &&
                            r.PersianYear == year &&
                            r.PersianMonth == month,
                       cancellationToken);

        var checklistCompletionsCount = await _context.ChecklistCompletions
            .Where(cc => cc.Checklist.DeviceId == deviceId)
            .CountAsync(cc => cc.PersianDate.StartsWith($"{year}/{month:D2}"), cancellationToken);

        var dailyAnalysesCount = await _context.DailyReports
            .CountAsync(dr => dr.DeviceId == deviceId &&
                             dr.PersianYear == year &&
                             dr.PersianMonth == month,
                       cancellationToken);

        // Generate performance summary
        var performanceSummary = GeneratePerformanceSummary(
            totalTelemetryRecords,
            totalAlerts,
            successfulAlerts,
            failedAlerts,
            avgTemp,
            avgHumidity,
            avgLux,
            avgGas,
            userReportsCount,
            checklistCompletionsCount);

        return new MonthlyReportDto
        {
            DeviceId = deviceId,
            DeviceName = device.DeviceName,
            Year = year,
            Month = month,
            TotalAlerts = totalAlerts,
            SmsAlerts = smsAlerts,
            CallAlerts = callAlerts,
            SuccessfulAlerts = successfulAlerts,
            FailedAlerts = failedAlerts,
            PowerOutageAlerts = powerOutageAlerts,
            TotalTelemetryRecords = totalTelemetryRecords,
            AverageTemperature = avgTemp,
            MinTemperature = minTemp,
            MaxTemperature = maxTemp,
            AverageHumidity = avgHumidity,
            MinHumidity = minHumidity,
            MaxHumidity = maxHumidity,
            AverageLux = avgLux,
            AverageGasPPM = avgGas,
            MaxGasPPM = maxGas,
            UserDailyReportsCount = userReportsCount,
            ChecklistCompletionsCount = checklistCompletionsCount,
            DailyAnalysesCount = dailyAnalysesCount,
            PerformanceSummary = performanceSummary,
            GeneratedAt = DateTime.UtcNow
        };
    }

    private string GeneratePerformanceSummary(
        int totalRecords,
        int totalAlerts,
        int successfulAlerts,
        int failedAlerts,
        decimal avgTemp,
        decimal avgHumidity,
        decimal avgLux,
        int avgGas,
        int userReports,
        int checklistCompletions)
    {
        var summary = new List<string>();

        summary.Add($"📊 آمار کلی:");
        summary.Add($"  • تعداد رکوردهای ثبت شده: {totalRecords:N0}");
        summary.Add($"  • میانگین دما: {avgTemp:F1}°C");
        summary.Add($"  • میانگین رطوبت: {avgHumidity:F1}%");
        summary.Add($"  • میانگین نور: {avgLux:F0} لوکس");
        if (avgGas > 0)
            summary.Add($"  • میانگین CO: {avgGas} PPM");

        summary.Add("");
        summary.Add($"🚨 هشدارها:");
        summary.Add($"  • تعداد کل: {totalAlerts}");
        summary.Add($"  • موفق: {successfulAlerts}");
        if (failedAlerts > 0)
            summary.Add($"  • ناموفق: {failedAlerts} ⚠️");

        if (userReports > 0 || checklistCompletions > 0)
        {
            summary.Add("");
            summary.Add($"📝 فعالیت کاربران:");
            if (userReports > 0)
                summary.Add($"  • گزارش‌های روزانه: {userReports}");
            if (checklistCompletions > 0)
                summary.Add($"  • تکمیل چک‌لیست: {checklistCompletions}");
        }

        // Performance rating
        summary.Add("");
        var rating = CalculatePerformanceRating(totalRecords, failedAlerts, totalAlerts);
        summary.Add($"⭐ ارزیابی کلی: {rating}");

        return string.Join("\n", summary);
    }

    private string CalculatePerformanceRating(int totalRecords, int failedAlerts, int totalAlerts)
    {
        if (totalRecords == 0)
            return "بدون داده";

        var failureRate = totalAlerts > 0 ? (double)failedAlerts / totalAlerts : 0;

        if (failureRate == 0 && totalRecords > 1000)
            return "عالی ✅";
        else if (failureRate < 0.1 && totalRecords > 500)
            return "خوب 👍";
        else if (failureRate < 0.3)
            return "متوسط ⚠️";
        else
            return "نیاز به بررسی 🔧";
    }
}