using Evergreen.Health.Application.Health.Entities;
using Evergreen.Health.Application.Health.Devices;
using Evergreen.Health.Application.Health.Devices.Contracts;
using Evergreen.Health.Application.Health.Devices.Discovery;
using Evergreen.Health.Application.Health.Scenes;
using Evergreen.Health.Application.Health.Policies;
using Evergreen.Health.Application.Health.Integrations.HomeAssistant;
using Evergreen.Health.Application.Health.Integrations.MiAirX;
using Evergreen.Health.Application.Health.Models;
using Furion.DatabaseAccessor;
using Furion.FriendlyException;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Logging;
using SqlSugar;
using System.Globalization;
using System.Security.Claims;
using System.Text.Json;

namespace Evergreen.Health.Application.Health.Services;

[ApiDescriptionSettings("健康管理", Name = "HealthHomeAssistant", Order = 51)]
public sealed class HealthHomeAssistantService : IDynamicApiController, ITransient
{
    private const string HealthUserIdClaim = "health_user_id";
    private readonly HomeAssistantClient _homeAssistant;
    private readonly TcmMusicTransitionService _musicTransition;
    private readonly HomeAssistantLightTransitionService _lightTransition;
    private readonly HomeAssistantRegistryService _registryService;
    private readonly HomeAssistantOptions _options;
    private readonly SqlSugarRepository<HealthSceneExecution> _executionRepository;
    private readonly SqlSugarRepository<HealthProfile> _profileRepository;
    private readonly MattressComfortService _mattressComfort;
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly DeviceModuleRegistry _modules;
    private readonly HealthSceneCoordinator _scenes;
    private readonly HomeAssistantDeviceCatalog _catalog;
    private readonly ILogger<HealthHomeAssistantService> _logger;

    public HealthHomeAssistantService(
        HomeAssistantClient homeAssistant,
        TcmMusicTransitionService musicTransition,
        HomeAssistantLightTransitionService lightTransition,
        HomeAssistantRegistryService registryService,
        IOptions<HomeAssistantOptions> options,
        SqlSugarRepository<HealthSceneExecution> executionRepository,
        SqlSugarRepository<HealthProfile> profileRepository,
        MattressComfortService mattressComfort,
        IHttpContextAccessor httpContextAccessor,
        DeviceModuleRegistry modules,
        HealthSceneCoordinator scenes,
        HomeAssistantDeviceCatalog catalog,
        ILogger<HealthHomeAssistantService> logger)
    {
        _homeAssistant = homeAssistant;
        _musicTransition = musicTransition;
        _lightTransition = lightTransition;
        _registryService = registryService;
        _options = options.Value;
        _executionRepository = executionRepository;
        _profileRepository = profileRepository;
        _mattressComfort = mattressComfort;
        _httpContextAccessor = httpContextAccessor;
        _modules = modules;
        _scenes = scenes;
        _catalog = catalog;
        _logger = logger;
    }

    [Authorize]
    [HttpGet("/api/health/home-assistant/lights/transition")]
    public HomeAssistantLightTransitionOutput GetLightTransitionStatus() => _lightTransition.GetStatus();

    [Authorize]
    [HttpGet("/api/health/home-assistant/music/transition")]
    public TcmMusicTransitionOutput GetMusicTransitionStatus() => _musicTransition.GetStatus();

    [Authorize]
    [HttpPost("/api/health/home-assistant/lights/sleep")]
    public async Task<HomeAssistantLightTransitionOutput> StartSleepLight(CancellationToken cancellationToken)
    {
        try { return await _lightTransition.StartSleepAsync(_options.SleepScene.LightColorTemperatureKelvin, cancellationToken); }
        catch (Exception exception) when (exception is not OperationCanceledException) { return new HomeAssistantLightTransitionOutput { Success = false, Message = exception.Message }; }
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/lights/wake")]
    public async Task<HomeAssistantLightTransitionOutput> StartWakeLight(CancellationToken cancellationToken)
    {
        try { return await _lightTransition.StartWakeAsync(cancellationToken); }
        catch (Exception exception) when (exception is not OperationCanceledException) { return new HomeAssistantLightTransitionOutput { Success = false, Message = exception.Message }; }
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/lights/stop")]
    public async Task<HomeAssistantLightTransitionOutput> StopLightTransition(CancellationToken cancellationToken)
    {
        try { return await _lightTransition.CancelAsync(cancellationToken); }
        catch (Exception exception) when (exception is not OperationCanceledException) { return new HomeAssistantLightTransitionOutput { Success = false, Message = exception.Message }; }
    }

    [Authorize]
    [HttpGet("/api/health/home-assistant/status")]
    public async Task<HomeAssistantStatusOutput> GetStatus(CancellationToken cancellationToken)
    {
        var userId = GetCurrentUserId();
        try
        {
            var states = await _homeAssistant.GetStatesAsync(cancellationToken);
            var stateMap = states.ToDictionary(item => item.EntityId, StringComparer.OrdinalIgnoreCase);
            var registries = await _registryService.GetRegistriesAsync(cancellationToken);

            var discoveredDevices = _catalog.BuildDiscoveredDevices(registries, stateMap);
            var summary = HomeAssistantDeviceCatalog.BuildSummary(discoveredDevices);
            var sceneDevices = _catalog.BuildSceneDevicesSummary(stateMap);
            var environment = _catalog.BuildEnvironmentOutput(stateMap, discoveredDevices);

            PersonalizedSceneConfig? userConfig = null;
            var constitutionCode = string.Empty;
            try
            {
                var profile = await _profileRepository.GetFirstAsync(p => p.UserId == userId);
                var tcmResult = TcmConstitutionRules.Read(profile);
                if (tcmResult.HasCompleted)
                {
                    constitutionCode = tcmResult.ConstitutionCode;
                    userConfig = tcmResult.SceneConfig;
                    var comfort = _mattressComfort.Get(profile, stateMap);
                    MattressComfortService.ApplyTo(userConfig, comfort);
                }
            }
            catch (Exception exception) when (exception is not OperationCanceledException)
            {
                _logger.LogWarning(exception, "读取用户 {UserId} 的设备参数预览失败", userId);
            }

            var scenePresets = userConfig is null
                ? new List<HomeAssistantScenePresetItem>()
                : BuildScenePresets(stateMap, userConfig, constitutionCode);

            return new HomeAssistantStatusOutput
            {
                Connected = true,
                Message = "Home Assistant 已连接",
                CheckedAt = DateTimeOffset.Now,
                Summary = summary,
                Devices = discoveredDevices,
                SceneDevices = sceneDevices,
                Environment = environment,
                ScenePresets = scenePresets,
                ControlParameters = BuildControlParameterStates(stateMap)
            };
        }
        catch (Exception exception) when (exception is not OperationCanceledException)
        {
            return new HomeAssistantStatusOutput
            {
                Connected = false,
                Message = $"Home Assistant 连接失败：{exception.Message}",
                CheckedAt = DateTimeOffset.Now,
                Summary = new HomeAssistantSummaryOutput(),
                Devices = [],
                SceneDevices = _catalog.BuildSceneDevicesSummary(new Dictionary<string, HomeAssistantState>(StringComparer.OrdinalIgnoreCase)),
                Environment = new HomeAssistantEnvironmentOutput(),
                ScenePresets = [],
                ControlParameters = []
            };
        }
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/devices/switch")]
    public async Task<HomeAssistantDeviceSwitchOutput> SwitchDevice(
        [FromBody] HomeAssistantDeviceSwitchInput input,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(input.DeviceId))
        {
            return new HomeAssistantDeviceSwitchOutput
            {
                Success = false,
                Message = "未指定控制设备"
            };
        }

        try
        {
            var states = await _homeAssistant.GetStatesAsync(cancellationToken);
            var stateMap = states.ToDictionary(s => s.EntityId, StringComparer.OrdinalIgnoreCase);

            var registries = await _registryService.GetRegistriesAsync(cancellationToken);
            var discovered = _catalog.BuildDiscoveredDevices(registries, stateMap);
            var targetDevice = discovered.FirstOrDefault(d =>
                string.Equals(d.DeviceId, input.DeviceId, StringComparison.OrdinalIgnoreCase));

            if (targetDevice is null || string.IsNullOrWhiteSpace(targetDevice.PrimaryControlEntityId))
            {
                return new HomeAssistantDeviceSwitchOutput
                {
                    Success = false,
                    DeviceId = input.DeviceId,
                    Message = "该设备没有经过确认的主控开关"
                };
            }

            var targetEntityId = targetDevice.PrimaryControlEntityId;
            if (!string.IsNullOrWhiteSpace(input.EntityId) &&
                !string.Equals(input.EntityId, targetEntityId, StringComparison.OrdinalIgnoreCase))
            {
                return new HomeAssistantDeviceSwitchOutput
                {
                    Success = false,
                    DeviceId = input.DeviceId,
                    EntityId = input.EntityId,
                    Message = "请求的实体不属于该设备的主控能力"
                };
            }

            var candidate = targetDevice.Entities.FirstOrDefault(e =>
                string.Equals(e.EntityId, targetEntityId, StringComparison.OrdinalIgnoreCase));
            if (candidate is null || candidate.Domain is not ("switch" or "humidifier" or "light" or "media_player" or "climate"))
            {
                return new HomeAssistantDeviceSwitchOutput
                {
                    Success = false,
                    DeviceId = input.DeviceId,
                    EntityId = targetEntityId,
                    Message = "该实体不支持安全的开关控制"
                };
            }

            var module = _modules.ForEntities(targetDevice.Entities.Select(entity => entity.EntityId));
            if (module is not null && !string.Equals(module.PrimaryEntityId, targetEntityId, StringComparison.OrdinalIgnoreCase))
                module = null;
            if (module?.PowerUsesIndependentGateway != true &&
                (!stateMap.TryGetValue(targetEntityId, out var currentState) || !IsAvailable(currentState)))
                throw new InvalidOperationException("目标设备当前处于离线状态");
            if (module is not null)
                await module.SetPowerAsync(input.TurnOn, cancellationToken);
            else
                await _homeAssistant.CallServiceAsync(candidate.Domain, input.TurnOn ? "turn_on" : "turn_off",
                    new Dictionary<string, object?> { ["entity_id"] = targetEntityId }, cancellationToken);

            var reportedState = "";
            try
            {
                reportedState = (await _homeAssistant.GetStatesAsync(cancellationToken)).FirstOrDefault(state =>
                    string.Equals(state.EntityId, targetEntityId, StringComparison.OrdinalIgnoreCase))?.State ?? "";
            }
            catch (Exception exception) when (exception is not OperationCanceledException) { }
            return new HomeAssistantDeviceSwitchOutput
            {
                Success = true, DeviceId = input.DeviceId, EntityId = targetEntityId, State = reportedState,
                Message = input.TurnOn ? "开启指令已发送" : "关闭指令已发送"
            };
        }
        catch (Exception ex) when (ex is not OperationCanceledException)
        {
            return new HomeAssistantDeviceSwitchOutput
            {
                Success = false,
                DeviceId = input.DeviceId,
                EntityId = input.EntityId ?? string.Empty,
                Message = $"控制失败：{ex.Message}"
            };
        }
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/devices/set-parameter")]
    public async Task<HomeAssistantSetParameterOutput> SetParameter(
        [FromBody] HomeAssistantSetParameterInput input,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(input.DeviceId) || string.IsNullOrWhiteSpace(input.ParameterType))
        {
            return new HomeAssistantSetParameterOutput
            {
                Success = false,
                DeviceId = input.DeviceId,
                ParameterType = input.ParameterType,
                Message = "未指定控制设备或参数"
            };
        }

        try
        {
            var states = await _homeAssistant.GetStatesAsync(cancellationToken);
            var stateMap = states.ToDictionary(item => item.EntityId, StringComparer.OrdinalIgnoreCase);
            var registries = await _registryService.GetRegistriesAsync(cancellationToken);
            var discovered = _catalog.BuildDiscoveredDevices(registries, stateMap);
            var targetDevice = discovered.FirstOrDefault(d =>
                string.Equals(d.DeviceId, input.DeviceId, StringComparison.OrdinalIgnoreCase));
            if (targetDevice is null)
            {
                return new HomeAssistantSetParameterOutput
                {
                    Success = false,
                    DeviceId = input.DeviceId,
                    ParameterType = input.ParameterType,
                    Message = "未找到指定设备"
                };
            }

            var parameterType = input.ParameterType.Trim().ToLowerInvariant();
            var module = _modules.ForParameter(parameterType);
            var command = module.BuildParameterCommand(parameterType, input.Value);
            if (string.IsNullOrWhiteSpace(command.EntityId))
                throw new InvalidOperationException("该参数尚未配置 Home Assistant 实体");
            if (!string.IsNullOrWhiteSpace(input.EntityId) &&
                !string.Equals(input.EntityId, command.EntityId, StringComparison.OrdinalIgnoreCase))
                throw new InvalidOperationException("请求实体与该参数的受信任实体不匹配");
            if (!targetDevice.Entities.Any(entity => string.Equals(entity.EntityId, command.EntityId, StringComparison.OrdinalIgnoreCase)))
                throw new InvalidOperationException("该参数不属于指定设备");
            // 外部音频网关不依赖 HA 媒体实体是否在线，但仍校验实体归属。
            if (!module.ParameterUsesIndependentGateway(command) &&
                (!stateMap.TryGetValue(command.EntityId, out var state) || !IsAvailable(state)))
                throw new InvalidOperationException("目标参数实体当前离线或不可用");
            await module.ExecuteParameterAsync(command, cancellationToken);
            return new HomeAssistantSetParameterOutput
            {
                Success = true, DeviceId = input.DeviceId, ParameterType = parameterType,
                Message = command.ExpectedState is null ? "参数调节指令已发送" : "已回读确认参数"
            };
        }
        catch (Exception ex) when (ex is not OperationCanceledException)
        {
            return new HomeAssistantSetParameterOutput
            {
                Success = false,
                DeviceId = input.DeviceId,
                ParameterType = input.ParameterType ?? "",
                Message = $"调节失败：{ex.Message}"
            };
        }
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/scenes/sleep")]
    public async Task<HomeAssistantSceneOutput> ExecuteSleepScene(CancellationToken cancellationToken)
    {
        var userId = GetCurrentUserId();
        return await ExecuteScene("sleep", null, "", cancellationToken, async token =>
        {
            token.ThrowIfCancellationRequested();
            var profile = await _profileRepository.GetFirstAsync(p => p.UserId == userId);
            token.ThrowIfCancellationRequested();
            var tcmResult = TcmConstitutionRules.Read(profile);
            if (!tcmResult.HasCompleted)
                throw new ScenePreparationException("请先完成中医四诊，生成体质倾向后再一键启动");
            var config = tcmResult.SceneConfig;
            var mattressComfort = await _mattressComfort.GetAsync(profile, token);
            MattressComfortService.ApplyTo(config, mattressComfort);
            RoomTemperaturePolicy.PickTargetForSession(config.ClimateAdvice);
            return new PreparedSleepScene(config, tcmResult.ConstitutionCode);
        });
    }

    [Authorize]
    [HttpPost("/api/health/home-assistant/scenes/all-off")]
    public Task<HomeAssistantSceneOutput> ExecuteAllOffScene(CancellationToken cancellationToken)
        => ExecuteScene("all-off", null, "", cancellationToken);

    private async Task<HomeAssistantSceneOutput> ExecuteScene(string sceneCode,
        PersonalizedSceneConfig? config, string constitutionCode, CancellationToken cancellationToken,
        Func<CancellationToken, Task<PreparedSleepScene>>? prepare = null)
    {
        var userId = GetCurrentUserId();
        var output = prepare is null
            ? await _scenes.ExecuteAsync(sceneCode, config, constitutionCode, cancellationToken)
            : await _scenes.ExecutePreparedSleepAsync(prepare, cancellationToken);
        try
        {
            await _executionRepository.InsertAsync(new HealthSceneExecution
            {
                UserId = userId, SceneCode = output.SceneCode, SceneName = output.SceneName,
                Status = output.Status, Detail = JsonSerializer.Serialize(new { output.Message, output.Actions, output.ClimateAdvice })
            });
        }
        catch (Exception exception) when (exception is not OperationCanceledException)
        {
            _logger.LogError(exception, "场景 {SceneCode} 已执行，但用户 {UserId} 的执行记录未保存", sceneCode, userId);
            output.Message += "（执行记录暂未保存）";
        }
        return output;
    }

    private long GetCurrentUserId()
    {
        var value = _httpContextAccessor.HttpContext?.User.FindFirstValue(HealthUserIdClaim);
        if (!long.TryParse(value, out var userId) || userId <= 0)
            throw Oops.Oh("登录状态已失效，请重新登录").StatusCode(401);
        return userId;
    }

    private Dictionary<string, HomeAssistantParameterStateOutput> BuildControlParameterStates(
        IReadOnlyDictionary<string, HomeAssistantState> stateMap)
    {
        var result = new Dictionary<string, HomeAssistantParameterStateOutput>(StringComparer.OrdinalIgnoreCase);
        foreach (var parameter in _modules.Modules.SelectMany(module => module.Parameters))
        {
            if (string.IsNullOrWhiteSpace(parameter.EntityId) || !stateMap.TryGetValue(parameter.EntityId, out var state)) continue;
            result[parameter.Key] = new()
            {
                EntityId = parameter.EntityId, State = state.State, Available = IsAvailable(state),
                Attributes = HomeAssistantDeviceCatalog.ExtractSafeAttributes(state)
            };
        }
        return result;
    }

    private List<HomeAssistantScenePresetItem> BuildScenePresets(
        IReadOnlyDictionary<string, HomeAssistantState> states,
        PersonalizedSceneConfig? config, string constitutionCode)
    {
        if (config is null) return [];
        var previews = _modules.Modules.Select(module => module.BuildPreview(config, constitutionCode))
            .Where(preview => preview is not null).ToList();
        foreach (var preview in previews)
        {
            if (!string.IsNullOrWhiteSpace(preview!.AvailabilityMessage)) continue;
            preview.Available = !string.IsNullOrWhiteSpace(preview.EntityId) &&
                states.TryGetValue(preview.EntityId, out var state) && IsAvailable(state);
            preview.AvailabilityMessage = preview.Available ? "当前可执行" : "当前不可用，执行时跳过";
        }
        return previews!;
    }

    private static bool IsAvailable(HomeAssistantState state)
        => DeviceActionRunner.IsAvailable(state);
}