using Microsoft.AspNetCore.Mvc;
using GreenHome.Application;
using System.Text;

namespace GreenHome.Api.Controllers;

[ApiController]
[Route("api/[controller]")]
public class TelemetryController : ControllerBase
{
    private readonly ITelemetryService telemetryService;
    private readonly IAlertService alertService;
    private readonly IAlertConditionService alertConditionService;

    public TelemetryController(ITelemetryService telemetryService, IAlertService alertService, IAlertConditionService alertConditionService)
    {
        this.telemetryService = telemetryService;
        this.alertService = alertService;
        this.alertConditionService = alertConditionService;
    }

    [HttpGet]
    public async Task<ActionResult<PagedResult<TelemetryDto>>> List([FromQuery] int? deviceId, [FromQuery] DateTime? startUtc, [FromQuery] DateTime? endUtc, [FromQuery] DateTime? sinceUtc, [FromQuery] int page = 1, [FromQuery] int pageSize = 20, CancellationToken cancellationToken = default)
    {
        var filter = new TelemetryFilter { DeviceId = deviceId, StartDateUtc = startUtc, EndDateUtc = endUtc, SinceUtc = sinceUtc, Page = page, PageSize = pageSize };
        var result = await telemetryService.ListAsync(filter, cancellationToken);
        return Ok(result);
    }

    [HttpGet("AddData")]
    public async Task<ActionResult<string>> Create([FromQuery] TelemetryDto telementry, [FromQuery] string? lastUpdateDate, CancellationToken cancellationToken)
    {
        telementry.TimestampUtc = DateTime.UtcNow;
        var id = await telemetryService.AddAsync(telementry, cancellationToken);

        var parts = new List<string> { $"ID:{id}" };
        var deviceId = telementry.DeviceId;

        if (deviceId > 0)
        {
            // 1. Check alerts and power status
            var alertResult = await alertService.CheckAndSendAlertsAsync(deviceId, telementry, cancellationToken);
            if (alertResult != null)
            {
                if (alertResult.Messages.Count > 0)
                {
                    parts.Add($"A:{alertResult.Messages.Count}");
                    parts.Add($"R:{alertResult.Recipients}");
                    parts.Add($"M:{string.Join("@", alertResult.Messages)}");
                }

                if (alertResult.PowerStatus != null)
                {
                    parts.Add($"P:{alertResult.PowerStatus}");
                }
            }

            // 2. Check relay conditions update
            if (!string.IsNullOrEmpty(lastUpdateDate))
            {
                var parsedDate = ParseLastUpdateDate(lastUpdateDate);
                var relayConditions = await alertConditionService.GetUpdatedRelayConditionsAsync(deviceId, parsedDate, cancellationToken);
                if (relayConditions.Count > 0)
                {
                    parts.Add("RU:1");
                    parts.Add($"RL:{relayConditions.Count}");
                    parts.Add($"RC:{EncodeRelayConditions(relayConditions)}");
                }
            }
        }

        return Ok(string.Join("|", parts));
    }

    /// <summary>
    /// Encode relay conditions into a compact string format for STM32 parsing.
    /// Format: E{enabled}T{timeType}R{relay}S{sensor}O{op}V{value1}[,{value2}]
    /// Multiple conditions separated by |, multiple rules within a condition separated by &
    /// </summary>
    private static string EncodeRelayConditions(IReadOnlyList<RelayConditionDto> conditions)
    {
        return string.Join("|", conditions.Select(c =>
        {
            var rules = string.Join("&", c.Rules.Select(r =>
            {
                var rule = $"S{r.Sensor}O{r.Op}V{r.V1}";
                if (r.V2.HasValue)
                    rule += $",{r.V2.Value}";
                return rule;
            }));
            return $"E{c.Enabled}T{c.TimeType}R{c.Relay}{rules}";
        }));
    }

    /// <summary>
    /// Parse date string in format: yyyy/MM/dd-HH:mm
    /// </summary>
    private static DateTime? ParseLastUpdateDate(string dateStr)
    {
        if (string.IsNullOrEmpty(dateStr))
            return null;

        // Try parsing as yyyy/MM/dd-HH:mm
        if (DateTime.TryParseExact(dateStr, "yyyy/MM/dd-HH:mm", null, System.Globalization.DateTimeStyles.None, out var result))
        {
            return DateTime.SpecifyKind(result, DateTimeKind.Utc);
        }

        // Try parsing as yyyy-MM-dd HH:mm (ISO-like)
        if (DateTime.TryParseExact(dateStr, "yyyy-MM-dd HH:mm", null, System.Globalization.DateTimeStyles.None, out var result2))
        {
            return DateTime.SpecifyKind(result2, DateTimeKind.Utc);
        }

        return null;
    }

    [HttpGet("minmax")]
    public async Task<ActionResult<TelemetryMinMax>> MinMax([FromQuery] int deviceId, [FromQuery] DateTime? startUtc, [FromQuery] DateTime? endUtc, CancellationToken cancellationToken)
    {
        var result = await telemetryService.GetMinMaxAsync(deviceId, startUtc, endUtc, cancellationToken);
        return Ok(result);
    }

    [HttpGet("days")]
    public async Task<ActionResult<IReadOnlyList<DayCount>>> Days([FromQuery] int deviceId, [FromQuery] int year, [FromQuery] int month, CancellationToken cancellationToken)
    {
        var result = await telemetryService.GetMonthDaysAsync(deviceId, year, month, cancellationToken);
        return Ok(result);
    }

    [HttpGet("months")]
    public async Task<ActionResult<IReadOnlyList<int>>> Months([FromQuery] int deviceId, [FromQuery] int year, CancellationToken cancellationToken)
    {
        var result = await telemetryService.GetActiveMonthsAsync(deviceId, year, cancellationToken);
        return Ok(result);
    }

    [HttpGet("aggregate")]
    public async Task<ActionResult<IReadOnlyList<TelemetryBucketDto>>> Aggregate([FromQuery] int deviceId, [FromQuery] DateTime? startUtc, [FromQuery] DateTime? endUtc, [FromQuery] int bucketMinutes = 15, CancellationToken cancellationToken = default)
    {
        var result = await telemetryService.GetAggregatedAsync(deviceId, startUtc, endUtc, bucketMinutes, cancellationToken);
        return Ok(result);
    }
}