using Evergreen.Health.Application.Health.Devices.Contracts;
using Evergreen.Health.Application.Health.Integrations.HomeAssistant;
using Evergreen.Health.Application.Health.Models;
using System.Text.Json;

namespace Evergreen.Health.Application.Health.Devices.Lighting;

/// <summary>标准灯光参数依赖 HA 上报能力，不能将一个型号的色温范围或模式复制给另一盏灯。</summary>
public sealed class StandardLightControl : IStandardDeviceControl
{
    public IReadOnlyList<string> ParameterKeys => ["light_brightness", "light_color_temperature", "light_effect"];
    private static readonly string[] DimmableModes = ["brightness", "color_temp", "hs", "rgb", "rgbw", "rgbww", "xy", "white"];

    public DeviceCommand Build(HomeAssistantDiscoveredDeviceOutput device, HomeAssistantState state,
        string parameterType, object? value)
    {
        var entityId = device.PrimaryControlEntityId ?? "";
        if (!entityId.StartsWith("light.", StringComparison.Ordinal) ||
            !device.Entities.Any(entity => entity.EntityId == entityId && entity.Domain == "light"))
            throw new InvalidOperationException("该设备没有受信任的灯光主控能力");
        Validate(state, entityId, parameterType, value);
        var command = parameterType switch
        {
            "light_brightness" => Brightness(entityId, value),
            "light_color_temperature" => new DeviceCommand("设置灯光色温", entityId, "light", "turn_on",
                new Dictionary<string, object?> { ["color_temp_kelvin"] = DeviceValues.Integer(value, 1, int.MaxValue, "灯光色温") }),
            "light_effect" => new DeviceCommand("设置灯光模式", entityId, "light", "turn_on",
                new Dictionary<string, object?> { ["effect"] = DeviceValues.Text(value) }),
            _ => throw new InvalidOperationException("不支持的标准灯光参数")
        };
        return command with { ValidateCurrentState = current => Validate(current, entityId, parameterType, value),
            RetryOnVerificationMismatch = false };
    }

    private static DeviceCommand Brightness(string entityId, object? value)
    {
        var brightness = DeviceValues.Integer(value, 0, 100, "灯光亮度");
        return new("设置灯光亮度", entityId, "light", brightness == 0 ? "turn_off" : "turn_on",
            brightness == 0 ? null : new Dictionary<string, object?> { ["brightness_pct"] = brightness },
            brightness == 0 ? "off" : null);
    }

    private static void Validate(HomeAssistantState state, string entityId, string parameterType, object? value)
    {
        if (state.EntityId != entityId || state.State is not ("on" or "off"))
            throw new InvalidOperationException("灯光主控当前离线或状态未确认");
        var modes = Strings(state, "supported_color_modes");
        switch (parameterType)
        {
            case "light_brightness":
                if (!modes.Any(mode => DimmableModes.Contains(mode, StringComparer.Ordinal)))
                    throw new InvalidOperationException("这盏灯未声明支持亮度调节");
                DeviceValues.Integer(value, 0, 100, "灯光亮度");
                break;
            case "light_color_temperature":
                var min = state.GetDoubleAttribute("min_color_temp_kelvin");
                var max = state.GetDoubleAttribute("max_color_temp_kelvin");
                if (!modes.Contains("color_temp") || min is null || max is null || min <= 0 || max <= min ||
                    max > int.MaxValue || min != Math.Truncate(min.Value) || max != Math.Truncate(max.Value))
                    throw new InvalidOperationException("这盏灯的色温能力或范围未确认");
                DeviceValues.Integer(value, (int)min.Value, (int)max.Value, "灯光色温");
                break;
            case "light_effect":
                var features = state.GetDoubleAttribute("supported_features");
                if (features is null || features < 0 || features > int.MaxValue || features != Math.Truncate(features.Value) ||
                    (((int)features.Value & 4) == 0)) throw new InvalidOperationException("这盏灯未声明支持灯光模式");
                DeviceValues.Choice(value, Strings(state, "effect_list"), "灯光模式");
                break;
            default: throw new InvalidOperationException("不支持的标准灯光参数");
        }
    }

    private static string[] Strings(HomeAssistantState state, string key)
        => state.Attributes.ValueKind == JsonValueKind.Object && state.Attributes.TryGetProperty(key, out var values) &&
            values.ValueKind == JsonValueKind.Array
            ? values.EnumerateArray().Where(value => value.ValueKind == JsonValueKind.String)
                .Select(value => value.GetString()!).Where(value => !string.IsNullOrWhiteSpace(value)).Distinct(StringComparer.Ordinal).ToArray()
            : [];
}