using IntegrationGateway.Core.Abstractions;
using IntegrationGateway.Core.Infrastructure;
using IntegrationGateway.Core.Models;
using System.Text.Json;

namespace IntegrationGateway.Adapters.Owl;

public class OwlAdapter : IHasFlatDevices, IHasStreams, IAcceptsMetadataPush
{
    private readonly HttpClient _http;
    private readonly OwlAuthHelper _auth;
    private readonly RateLimiter _limiter = new(5);

    public string AdapterCode { get; }
    public string DisplayName => $"Owl ({AdapterCode})";
    public AdapterCapabilities Capabilities => new()
    {
        HasFlatDevices = true, HasStreams = true,
        HasPtz = true, HasRecordings = true,
        AcceptsMetadataPush = true
    };

    public OwlAdapter(string adapterCode, HttpClient http, string baseUrl, string username, string password)
    {
        AdapterCode = adapterCode;
        _http = http;
        _auth = new OwlAuthHelper(http, baseUrl, username, password);
    }

    public async Task InitializeAsync()
    {
        await _auth.GetTokenAsync();
    }

    public async Task<bool> HealthCheckAsync()
    {
        try
        {
            var client = await _auth.GetAuthenticatedClientAsync();
            var resp = await client.GetAsync("/health");
            return resp.IsSuccessStatusCode;
        }
        catch { return false; }
    }

    // ─── IHasFlatDevices ───
    public async Task<PagedResult<StandardDevice>> GetDevicesAsync(int page, int size, string? keyword = null)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var url = $"/devices?page={page}&size={size}";
        if (!string.IsNullOrEmpty(keyword)) url += $"&key={Uri.EscapeDataString(keyword)}";
        var json = await client.GetStringAsync(url);
        var owl = JsonSerializer.Deserialize<OwlPagedResult<OwlDevice>>(json)!;
        return new PagedResult<StandardDevice>
        {
            Items = owl.Items.Select(MapDevice).ToList(),
            Total = owl.Total
        };
    }

    public async Task<StandardDevice?> GetDeviceAsync(string sourceDeviceId)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var json = await client.GetStringAsync($"/devices/{sourceDeviceId}");
        var owl = JsonSerializer.Deserialize<OwlDevice>(json);
        return owl is null ? null : MapDevice(owl);
    }

    public async Task<List<StandardDevice>> GetAllDevicesAsync()
    {
        var result = new List<StandardDevice>();
        int page = 1;
        while (true)
        {
            var paged = await GetDevicesAsync(page, 50);
            result.AddRange(paged.Items);
            if (result.Count >= paged.Total) break;
            page++;
        }
        // Also get channels for each NVR
        var channels = await GetAllChannelsAsync();
        result.AddRange(channels);
        return result;
    }

    public async Task<PagedResult<StandardDevice>> GetChannelsAsync(int page, int size, string? parentDeviceId = null)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var url = $"/channels?page={page}&size={size}";
        if (!string.IsNullOrEmpty(parentDeviceId))
        {
            var resp = await client.GetStringAsync($"/devices/{parentDeviceId}/channels");
            var channels = JsonSerializer.Deserialize<OwlPagedResult<OwlChannel>>(resp)!;
            return new PagedResult<StandardDevice>
            {
                Items = channels.Items.Select(c => MapChannel(c)).ToList(),
                Total = channels.Total
            };
        }
        var json = await client.GetStringAsync(url);
        var owl = JsonSerializer.Deserialize<OwlPagedResult<OwlChannel>>(json)!;
        return new PagedResult<StandardDevice>
        {
            Items = owl.Items.Select(c => MapChannel(c)).ToList(),
            Total = owl.Total
        };
    }

    public async Task<List<StandardDevice>> GetAllChannelsAsync()
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var json = await client.GetStringAsync("/channels?size=1000");
        var owl = JsonSerializer.Deserialize<OwlPagedResult<OwlChannel>>(json)!;
        return owl.Items.Select(c => MapChannel(c)).ToList();
    }

    // ─── IHasStreams ───
    public async Task<StreamUrls> GetLiveUrlAsync(string channelId)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var resp = await client.PostAsync($"/channels/{channelId}/play", null);
        resp.EnsureSuccessStatusCode();
        var json = await resp.Content.GetStringAsync();
        var play = JsonSerializer.Deserialize<OwlPlayResponse>(json)!;
        return MapStreamUrls(play);
    }

    public async Task<StreamUrls> GetPlaybackUrlAsync(string channelId, DateTime start, DateTime end)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var startMs = new DateTimeOffset(start).ToUnixTimeMilliseconds();
        var endMs = new DateTimeOffset(end).ToUnixTimeMilliseconds();
        var token = await _auth.GetTokenAsync();
        return new StreamUrls
        {
            Hls = $"{client.BaseAddress}recordings/channels/{channelId}/index.m3u8?start_ms={startMs}&end_ms={endMs}&token={token}"
        };
    }

    public async Task StopPlayAsync(string channelId)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        await client.PostAsync($"/channels/{channelId}/stop", null);
    }

    public async Task<StreamUrls> GetSnapshotAsync(string channelId)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var resp = await client.PostAsync($"/channels/{channelId}/snapshot",
            new StringContent("{}", System.Text.Encoding.UTF8, "application/json"));
        var json = await resp.Content.ReadAsStringAsync();
        var snap = JsonSerializer.Deserialize<OwlSnapshotResponse>(json)!;
        return new StreamUrls { Hls = snap.Link };
    }

    public async Task PtzControlAsync(string channelId, string direction, float speed)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        await client.PostAsJsonAsync($"/channels/{channelId}/ptz/control", new
        {
            action = "continuous",
            direction,
            speed
        });
    }

    public async Task PtzStopAsync(string channelId)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        await client.PostAsJsonAsync($"/channels/{channelId}/ptz/control", new
        {
            action = "stop"
        });
    }

    public async Task<PagedResult<StandardRecording>> GetRecordingsAsync(string channelId, DateTime start, DateTime end, int page, int size)
    {
        await _limiter.WaitAsync();
        var client = await _auth.GetAuthenticatedClientAsync();
        var startMs = new DateTimeOffset(start).ToUnixTimeMilliseconds();
        var endMs = new DateTimeOffset(end).ToUnixTimeMilliseconds();
        var json = await client.GetStringAsync(
            $"/recordings?cid={channelId}&start_ms={startMs}&end_ms={endMs}&page={page}&size={size}");
        var owl = JsonSerializer.Deserialize<OwlPagedResult<OwlRecording>>(json)!;
        return new PagedResult<StandardRecording>
        {
            Items = owl.Items.Select(r => new StandardRecording
            {
                Id = r.Id.ToString(),
                ChannelId = r.Cid ?? "",
                StartedAt = r.StartedAt,
                EndedAt = r.EndedAt,
                Duration = r.Duration,
                FilePath = r.Path,
                Size = r.Size
            }).ToList(),
            Total = owl.Total
        };
    }

    // ─── IAcceptsMetadataPush ───
    public async Task<MetadataPushResult> PushMetadataAsync(string sourceDeviceId, MetadataChangeSet changes)
    {
        var client = await _auth.GetAuthenticatedClientAsync();
        var body = new Dictionary<string, object>();
        if (changes.Name != null) body["name"] = changes.Name;
        var resp = await client.PutAsJsonAsync($"/devices/{sourceDeviceId}", body);
        return new MetadataPushResult { Success = resp.IsSuccessStatusCode };
    }

    // ─── Mapping ───
    private static StandardDevice MapDevice(OwlDevice d) => new()
    {
        SourceId = d.Id ?? "",
        Name = d.Name ?? d.Id ?? "",
        Category = "硬盘录像机",
        Group = "视频设备",
        IsOnline = d.IsOnline == "1",
        IsParent = true,
        IpAddress = d.Address,
        Port = int.TryParse(d.Port, out var port) ? port : null,
        Extra = new Dictionary<string, object?>
        {
            ["owlDeviceId"] = d.Id,
            ["protocol"] = d.Protocol ?? "GB28181",
            ["transport"] = d.Transport
        }
    };

    private static StandardDevice MapChannel(OwlChannel c) => new()
    {
        SourceId = c.Id ?? "",
        Name = c.Name ?? c.Id ?? "",
        Category = "摄像机",
        Group = "视频设备",
        IsOnline = c.IsOnline == "1",
        IsParent = false,
        ParentSourceId = c.DeviceId,
        Extra = new Dictionary<string, object?>
        {
            ["owlChannelId"] = c.Id,
            ["streamApp"] = c.App,
            ["streamName"] = c.Stream,
            ["hasPtz"] = c.HasPtz == "1"
        }
    };

    private static StreamUrls MapStreamUrls(OwlPlayResponse play)
    {
        var item = play.Items?.FirstOrDefault();
        return new StreamUrls
        {
            WsFlv = item?.WsFlv,
            HttpFlv = item?.HttpFlv,
            Hls = item?.Hls,
            WebRtc = item?.WebRtc,
            Rtmp = item?.Rtmp,
            Rtsp = item?.Rtsp
        };
    }
}

// ─── Owl JSON Models ───
public class OwlPagedResult<T> { public List<T> Items { get; set; } = new(); public int Total { get; set; } }
public class OwlDevice
{
    public string? Id { get; set; }
    public string? Name { get; set; }
    public string? IsOnline { get; set; }
    public string? Protocol { get; set; }
    public string? Address { get; set; }
    public string? Port { get; set; }
    public string? Transport { get; set; }
    public int Channels { get; set; }
}
public class OwlChannel
{
    public string? Id { get; set; }
    public string? DeviceId { get; set; }
    public string? Name { get; set; }
    public string? IsOnline { get; set; }
    public string? App { get; set; }
    public string? Stream { get; set; }
    public string? HasPtz { get; set; }
    public string? HasRecording { get; set; }
    public int RecordMode { get; set; }
}
public class OwlPlayResponse
{
    public string? App { get; set; }
    public string? Stream { get; set; }
    public List<OwlPlayItem>? Items { get; set; }
}
public class OwlPlayItem
{
    public string? Label { get; set; }
    public string? WsFlv { get; set; }
    public string? HttpFlv { get; set; }
    public string? Hls { get; set; }
    public string? WebRtc { get; set; }
    public string? Rtmp { get; set; }
    public string? Rtsp { get; set; }
}
public class OwlSnapshotResponse { public string? Link { get; set; } }
public class OwlRecording
{
    public int Id { get; set; }
    public string? Cid { get; set; }
    public DateTime StartedAt { get; set; }
    public DateTime EndedAt { get; set; }
    public double Duration { get; set; }
    public string? Path { get; set; }
    public long Size { get; set; }
}