using Evergreen.Health.Application.Health.Integrations.HomeAssistant;
using Evergreen.Health.Application.Health.Policies;
using Evergreen.Health.Application.Health.Scenes;
using Microsoft.Extensions.Options;
using System.Globalization;

namespace Evergreen.Health.Application.Health.Devices.Environment;

public sealed class IndoorEnvironmentReader
{
    private readonly HomeAssistantEntityOptions _entities;
    private readonly TimeProvider _time;
    public IndoorEnvironmentReader(IOptions<HomeAssistantOptions> options, TimeProvider time)
        => (_entities, _time) = (options.Value.Entities, time);

    public IndoorTemperatureSample Read(IReadOnlyDictionary<string, HomeAssistantState> states)
    {
        if (string.IsNullOrWhiteSpace(_entities.Temperature) ||
            !states.TryGetValue(_entities.Temperature, out var state) || !DeviceActionRunner.IsAvailable(state))
            return new(null, null, false, "室内温度实体未配置或不可用");
        var observedAt = state.LastReported ?? state.LastUpdated;
        if (observedAt is null || _time.GetUtcNow() - observedAt > TimeSpan.FromMinutes(30) ||
            observedAt > _time.GetUtcNow().AddMinutes(1))
            return new(null, observedAt, false, "室内温度数据缺少有效时间或已过期");
        if (!double.TryParse(state.State, NumberStyles.Float, CultureInfo.InvariantCulture, out var celsius) ||
            !double.IsFinite(celsius)) return new(null, observedAt, false, "室内温度数据无效");
        var unit = state.GetStringAttribute("unit_of_measurement");
        if (unit is "°F" or "F") celsius = (celsius - 32) * 5 / 9;
        else if (!string.IsNullOrWhiteSpace(unit) && unit is not ("°C" or "C" or "℃"))
            return new(null, observedAt, false, "室内温度单位未识别");
        if (celsius is < -20 or > 60) return new(null, observedAt, false, "室内温度超出有效范围");
        return new(celsius, observedAt, true, "室内温度数据有效");
    }
}