using Evergreen.Health.Application.Health.Entities;
using Furion.FriendlyException;
using SqlSugar;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;

namespace Evergreen.Health.Application.Health.Integrations.Ib43;

public sealed class Ib43DataRepository(ISqlSugarClient db)
{
    public static string DeviceKey(string productKey, string serialNumber) =>
        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(productKey + "/" + serialNumber)));

    public Task<bool> UserEnabled(long userId) => db.Queryable<HealthUser>()
        .AnyAsync(u => u.Id == userId && !u.IsDelete && u.Status == HealthUserStatus.Enabled);

    public async Task<bool> AdminEnabled(long userId) => await db.Queryable<SysUser>()
        .Where(u => u.Id == userId && u.AccountType == AccountTypeEnum.SuperAdmin && u.Status == StatusEnum.Enable).CountAsync() > 0;

    public Task<List<HealthIb43Binding>> Bindings(long userId) => db.Queryable<HealthIb43Binding>()
        .Where(b => b.UserId == userId).OrderBy(b => b.StartedAtMs, OrderByType.Desc).ToListAsync();

    public Task<List<HealthIb43Binding>> ActiveBindings(string productKey, string serialNumber)
    {
        var key = DeviceKey(productKey, serialNumber);
        return db.Queryable<HealthIb43Binding>().Where(b => b.DeviceKey == key && b.EndedAtMs == null).ToListAsync();
    }

    public async Task<HealthIb43Binding> OwnedBinding(long userId, string id) =>
        await db.Queryable<HealthIb43Binding>().Where(b => b.Id == id && b.UserId == userId).FirstAsync()
        ?? throw new AppFriendlyException("床位绑定不存在或无权访问", null) { StatusCode = 404 };

    public async Task Assign(HealthIb43Binding binding)
    {
        if (await db.Queryable<HealthIb43Binding>().AnyAsync(b => b.ActiveSlot == binding.ActiveSlot))
            throw new AppFriendlyException("该侧床位已分配，请先解绑", null) { StatusCode = 409 };
        try { await db.Insertable(binding).ExecuteCommandAsync(); }
        catch
        {
            if (await db.Queryable<HealthIb43Binding>().AnyAsync(b => b.ActiveSlot == binding.ActiveSlot))
                throw new AppFriendlyException("该侧床位已分配，请先解绑", null) { StatusCode = 409 };
            throw;
        }
    }

    public async Task Release(string id, long adminId, long endedAtMs)
    {
        var count = await db.Updateable<HealthIb43Binding>()
            .SetColumns(b => new HealthIb43Binding { ActiveSlot = null, EndedAtMs = endedAtMs, ReleasedBy = adminId })
            .Where(b => b.Id == id && b.EndedAtMs == null).ExecuteCommandAsync();
        if (count == 0) throw new AppFriendlyException("绑定不存在或已解绑", null) { StatusCode = 404 };
    }

    public async Task<Ib43SavedReport> Save(string reportId, Ib43Binding device, Ib43Report report)
    {
        if (!report.Accepted || report.Readings.Count == 0) return new(0, []);
        var matched = 0;
        var activeBeds = new List<Ib43SavedBed>();
        var key = DeviceKey(device.ProductKey, device.SerialNumber);
        var received = report.ReceivedAt.ToUnixTimeMilliseconds();
        // 按接收时刻归属；数据库重试期间发生解绑也不转移给新用户。
        var bindings = await db.Queryable<HealthIb43Binding>().Where(b => b.DeviceKey == key &&
            b.Simulation == device.Simulation && b.StartedAtMs <= received &&
            (b.EndedAtMs == null || b.EndedAtMs > received)).ToListAsync();
        foreach (var binding in bindings)
        {
            var readings = report.Readings.Where(p => p.Key.StartsWith(binding.Side + ".", StringComparison.Ordinal))
                .ToDictionary(p => p.Key[(binding.Side.Length + 1)..], p => p.Value);
            if (readings.Count == 0) continue;
            matched++;
            if (binding.EndedAtMs == null) activeBeds.Add(new(binding.Id, binding.Side));
            if (await db.Queryable<HealthIb43Observation>().AnyAsync(o => o.ReportId == reportId && o.BindingId == binding.Id)) continue;
            var observation = new HealthIb43Observation
            {
                ReportId = reportId, BindingId = binding.Id, UserId = binding.UserId, ReceivedAtMs = received,
                HasHeartRate = readings.ContainsKey("heartRate"), HasRespiration = readings.ContainsKey("respiration"),
                HasPresence = readings.ContainsKey("presence"), HasSnoring = readings.ContainsKey("snoring"),
                ReadingsJson = JsonSerializer.Serialize(readings)
            };
            try { await db.Insertable(observation).ExecuteCommandAsync(); }
            catch
            {
                // 同一进程处理的报告重试幂等；没有设备序号，不能对 MQTT 重投宣称去重。
                if (!await db.Queryable<HealthIb43Observation>().AnyAsync(o => o.ReportId == reportId && o.BindingId == binding.Id)) throw;
            }
        }
        return new(matched, activeBeds);
    }

    public async Task<Dictionary<string, Ib43Reading>> Latest(long userId, string bindingId)
    {
        var output = new Dictionary<string, Ib43Reading>();
        foreach (var metric in new[] { "heartRate", "respiration", "presence", "snoring" })
        {
            var query = db.Queryable<HealthIb43Observation>().Where(o => o.UserId == userId && o.BindingId == bindingId);
            query = metric switch
            {
                "heartRate" => query.Where(o => o.HasHeartRate),
                "respiration" => query.Where(o => o.HasRespiration),
                "presence" => query.Where(o => o.HasPresence),
                _ => query.Where(o => o.HasSnoring)
            };
            var row = await query.OrderBy(o => o.ReceivedAtMs, OrderByType.Desc).OrderBy(o => o.Id, OrderByType.Desc).FirstAsync();
            if (row != null) output[metric] = JsonSerializer.Deserialize<Dictionary<string, Ib43Reading>>(row.ReadingsJson)[metric];
        }
        return output;
    }

    public Task<List<HealthIb43Observation>> History(long userId, string bindingId, long fromMs, long toMs, long? beforeId, int take)
        => db.Queryable<HealthIb43Observation>().Where(o => o.UserId == userId && o.BindingId == bindingId &&
            o.ReceivedAtMs >= fromMs && o.ReceivedAtMs < toMs)
            .WhereIF(beforeId.HasValue, o => o.Id < beforeId.Value)
            .OrderBy(o => o.Id, OrderByType.Desc).Take(take).ToListAsync();
}