using GreenHome.Application;
using GreenHome.Sms.Ippanel;
using GreenHome.VoiceCall.Avanak;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using System.Text.Json;
using static GreenHome.Sms.Ippanel.IppanelSmsService;

namespace GreenHome.Infrastructure;

public sealed class AlertService : IAlertService
{
    private readonly GreenHomeDbContext dbContext;
    private readonly IDeviceSettingsService deviceSettingsService;
    private readonly ISmsService smsService;
    private readonly IVoiceCallService voiceCallService;
    private readonly ISunCalculatorService sunCalculatorService;
    private readonly ILogger<AlertService> logger;

    public AlertService(
        GreenHomeDbContext dbContext,
        IDeviceSettingsService deviceSettingsService,
        ISmsService smsService,
        IVoiceCallService voiceCallService,
        ISunCalculatorService sunCalculatorService,
        ILogger<AlertService> logger)
    {
        this.dbContext = dbContext;
        this.deviceSettingsService = deviceSettingsService;
        this.smsService = smsService;
        this.voiceCallService = voiceCallService;
        this.sunCalculatorService = sunCalculatorService;
        this.logger = logger;
    }

    public async Task CheckAndSendAlertsAsync(int deviceId, TelemetryDto telemetry, CancellationToken cancellationToken)
    {
        // Get device with settings and user
        var device = await dbContext.Devices
            .Include(d => d.User)
            .FirstOrDefaultAsync(d => d.Id == deviceId, cancellationToken);

        if (device == null || device.User == null)
        {
            logger.LogWarning("Device or user not found: DeviceId={DeviceId}", deviceId);
            return;
        }

        // Get device settings for location
        var settings = await deviceSettingsService.GetByDeviceIdAsync(deviceId, cancellationToken);

        // Get all enabled alert conditions for this device
        var conditions = await dbContext.AlertConditions
            .Include(c => c.Rules)
            .Where(c => c.DeviceId == deviceId && c.IsEnabled)
            .ToListAsync(cancellationToken);

        if (!conditions.Any())
        {
            logger.LogDebug("No enabled alert conditions for device: DeviceId={DeviceId}", deviceId);
            return;
        }

        // Determine if it's daytime or nighttime
        bool? isDaytime = null;
        if (settings?.Latitude != null && settings.Longitude != null)
        {
            isDaytime = sunCalculatorService.IsDaytime(DateTime.UtcNow, settings.Latitude.Value, settings.Longitude.Value);
        }

        // Check each condition
        foreach (var condition in conditions)
        {
            // Check time type filter
            if (condition.TimeType == Domain.AlertTimeType.Day && isDaytime == false)
            {
                continue; // This condition is for daytime only, but it's nighttime
            }
            if (condition.TimeType == Domain.AlertTimeType.Night && isDaytime == true)
            {
                continue; // This condition is for nighttime only, but it's daytime
            }

            // Check if all rules match (AND logic)
            var allRulesMatch = condition.Rules.All(rule => CheckRule(rule, telemetry));

            if (allRulesMatch && condition.Rules.Any())
            {
                // All rules passed, send alert if cooldown period has passed
                await SendAlertForConditionAsync(condition, device, telemetry, cancellationToken);
            }
        }
    }

    private bool CheckRule(Domain.AlertRule rule, TelemetryDto telemetry)
    {
        // Get sensor value
        var sensorValue = rule.SensorType switch
        {
            Domain.SensorType.Temperature => telemetry.TemperatureC,
            Domain.SensorType.Humidity => telemetry.HumidityPercent,
            Domain.SensorType.Soil => telemetry.SoilPercent,
            Domain.SensorType.Gas => telemetry.GasPPM,
            Domain.SensorType.Lux => telemetry.Lux,
            _ => 0m
        };

        // Check comparison
        return rule.ComparisonType switch
        {
            Domain.ComparisonType.GreaterThan => sensorValue > rule.Value1,
            Domain.ComparisonType.LessThan => sensorValue < rule.Value1,
            Domain.ComparisonType.Between => rule.Value2 != null && sensorValue >= rule.Value1 && sensorValue <= rule.Value2.Value,
            Domain.ComparisonType.OutOfRange => rule.Value2 != null && (sensorValue < rule.Value1 || sensorValue > rule.Value2.Value),
            _ => false
        };
    }

    private async Task SendAlertForConditionAsync(
        Domain.AlertCondition condition,
        Domain.Device device,
        TelemetryDto telemetry,
        CancellationToken cancellationToken)
    {
        // Determine cooldown based on notification type
        var cooldownMinutes = condition.NotificationType == Domain.AlertNotificationType.Call
            ? condition.CallCooldownMinutes
            : condition.SmsCooldownMinutes;

        // Check if alert was sent recently
        var cooldownTime = DateTime.UtcNow.AddMinutes(-cooldownMinutes);
        var recentAlert = await dbContext.AlertNotifications
            .Where(a => a.DeviceId == device.Id &&
                       a.UserId == device.User.Id &&
                       a.AlertConditionId == condition.Id &&
                       a.SentAt >= cooldownTime)
            .FirstOrDefaultAsync(cancellationToken);

        if (recentAlert != null)
        {
            logger.LogInformation("Alert skipped due to cooldown: DeviceId={DeviceId}, ConditionId={ConditionId}, Type={Type}",
                device.Id, condition.Id, condition.NotificationType);
            return;
        }

        // Build alert message
        var message = BuildAlertMessage(condition, device.DeviceName, telemetry);

        // Send notification
        string? messageOutboxIds = null;
        string? errorMessage = null;
        bool isSent = false;

        try
        {
            if (condition.NotificationType == Domain.AlertNotificationType.SMS)
            {
                (isSent, messageOutboxIds, errorMessage) = await SendSmsAlertAsync(device.User.Mobile, device.DeviceName, message, cancellationToken);
            }
            else // Call
            {
                (isSent, messageOutboxIds, errorMessage) = await SendCallAlertAsync(device.User.Mobile, device.DeviceName, message, cancellationToken);
            }
        }
        catch (Exception ex)
        {
            errorMessage = $"Exception: {ex.Message}";
            if (ex.InnerException != null)
            {
                errorMessage += $" | InnerException: {ex.InnerException.Message}";
            }
            isSent = false;
            logger.LogError(ex, "Failed to send alert: DeviceId={DeviceId}, ConditionId={ConditionId}, Type={Type}",
                device.Id, condition.Id, condition.NotificationType);
        }

        // Save notification to database
        var notification = new Domain.AlertNotification
        {
            DeviceId = device.Id,
            UserId = device.User.Id,
            AlertConditionId = condition.Id,
            NotificationType = condition.NotificationType,
            Message = message,
            MessageOutboxIds = messageOutboxIds,
            ErrorMessage = errorMessage,
            SentAt = DateTime.UtcNow,
            IsSent = isSent
        };

        dbContext.AlertNotifications.Add(notification);
        await dbContext.SaveChangesAsync(cancellationToken);
    }

    private string BuildAlertMessage(Domain.AlertCondition condition, string deviceName, TelemetryDto telemetry)
    {
        var parts = new List<string>();
        parts.Add($"هشدار گلخانه {deviceName}:");

        foreach (var rule in condition.Rules.OrderBy(r => r.Order))
        {
            var sensorName = rule.SensorType switch
            {
                Domain.SensorType.Temperature => "دما",
                Domain.SensorType.Humidity => "رطوبت",
                Domain.SensorType.Soil => "رطوبت خاک",
                Domain.SensorType.Gas => "گاز",
                Domain.SensorType.Lux => "نور",
                _ => "سنسور"
            };

            var sensorValue = rule.SensorType switch
            {
                Domain.SensorType.Temperature => telemetry.TemperatureC,
                Domain.SensorType.Humidity => telemetry.HumidityPercent,
                Domain.SensorType.Soil => telemetry.SoilPercent,
                Domain.SensorType.Gas => telemetry.GasPPM,
                Domain.SensorType.Lux => telemetry.Lux,
                _ => 0m
            };

            var unit = rule.SensorType switch
            {
                Domain.SensorType.Temperature => "°C",
                Domain.SensorType.Humidity => "%",
                Domain.SensorType.Soil => "%",
                Domain.SensorType.Gas => "PPM",
                Domain.SensorType.Lux => "لوکس",
                _ => ""
            };

            var conditionText = rule.ComparisonType switch
            {
                Domain.ComparisonType.GreaterThan => $"{sensorName} ({sensorValue:F1}{unit}) بیشتر از {rule.Value1}{unit}",
                Domain.ComparisonType.LessThan => $"{sensorName} ({sensorValue:F1}{unit}) کمتر از {rule.Value1}{unit}",
                Domain.ComparisonType.Between => $"{sensorName} ({sensorValue:F1}{unit}) بین {rule.Value1} و {rule.Value2}{unit}",
                Domain.ComparisonType.OutOfRange => $"{sensorName} ({sensorValue:F1}{unit}) خارج از محدوده {rule.Value1} تا {rule.Value2}{unit}",
                _ => $"{sensorName}: {sensorValue:F1}{unit}"
            };

            parts.Add(conditionText);
        }

        return string.Join(" و ", parts);
    }

    private async Task<(bool isSent, string? messageOutboxIds, string? errorMessage)> SendSmsAlertAsync(
        string mobile,
        string deviceName,
        string message,
        CancellationToken cancellationToken)
    {
        try
        {
            var smsResponse = await smsService.SendPatternSmsAsync(new PatternSmsRequest
            {
                Recipients = [mobile],
                PatternCode = "64di3w9kb0fxvif",
                Variables = new Dictionary<string, string> {
                    { "name", deviceName },
                    { "parameter", "شرایط" },
                    { "value", message },
                    { "status", "هشدار" }
                }
            }, cancellationToken);

            if (smsResponse != null && smsResponse.Meta.Status &&
                smsResponse.Data?.MessageOutboxIds != null &&
                smsResponse.Data.MessageOutboxIds.Count > 0)
            {
                var outboxIds = JsonSerializer.Serialize(smsResponse.Data.MessageOutboxIds);
                logger.LogInformation("Alert SMS sent: Mobile={Mobile}, OutboxIds={OutboxIds}", mobile, outboxIds);
                return (true, outboxIds, null);
            }
            else
            {
                var errors = new List<string>();
                if (!string.IsNullOrWhiteSpace(smsResponse?.Meta.Message))
                {
                    errors.Add(smsResponse.Meta.Message);
                }
                if (smsResponse?.Meta.Errors != null)
                {
                    foreach (var error in smsResponse.Meta.Errors)
                    {
                        errors.Add($"{error.Key}: {string.Join(", ", error.Value)}");
                    }
                }
                var errorMsg = errors.Count > 0 ? string.Join(" | ", errors) : "Unknown SMS error";
                logger.LogWarning("Alert SMS failed: Mobile={Mobile}, Error={Error}", mobile, errorMsg);
                return (false, null, errorMsg);
            }
        }
        catch (Exception ex)
        {
            var errorMsg = $"Exception: {ex.Message}";
            logger.LogError(ex, "Exception sending SMS alert: Mobile={Mobile}", mobile);
            return (false, null, errorMsg);
        }
    }

    private async Task<(bool isSent, string? callId, string? errorMessage)> SendCallAlertAsync(
        string mobile,
        string deviceName,
        string message,
        CancellationToken cancellationToken)
    {
        try
        {
            // TODO: Implement voice call integration
            // For now, just log and return success
            logger.LogInformation("Voice call alert requested: Mobile={Mobile}, Message={Message}", mobile, message);
            
            // Placeholder: In real implementation, call voiceCallService here
            // var callResponse = await voiceCallService.MakeCallAsync(mobile, message, cancellationToken);
            
            return (true, null, "Voice call not yet implemented");
        }
        catch (Exception ex)
        {
            var errorMsg = $"Exception: {ex.Message}";
            logger.LogError(ex, "Exception sending call alert: Mobile={Mobile}", mobile);
            return (false, null, errorMsg);
        }
    }
}