using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.SignalR;
using Microsoft.EntityFrameworkCore;
using RobotNet10.ScriptEngine.Data;
using RobotNet10.ScriptEngine.Shared;
using RobotNet10.Shared;
using System.Security.Claims;
using System.Text.Json;

namespace RobotNet10.ScriptEngine.Hubs;

/// <summary>
/// SignalR hub for InstanceMission management operations.
/// </summary>
[Authorize]
public class InstanceMissionHub : Hub
{
    private readonly ScriptEngineDbContext _dbContext;
    private readonly MissionManager _missionManager;

    public InstanceMissionHub(ScriptEngineDbContext dbContext, MissionManager missionManager)
    {
        _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
        _missionManager = missionManager ?? throw new ArgumentNullException(nameof(missionManager));
    }

    /// <summary>
    /// Searches instance missions with pagination and text search.
    /// Running missions are prioritized.
    /// </summary>
    public async Task<SearchResult<InstanceMissionDto>> SearchInstanceMissions(SearchRequest request)
    {
        var query = _dbContext.InstanceMissions.AsQueryable();

        // Text search on MissionName
        if (!string.IsNullOrWhiteSpace(request.TxtSearch))
        {
            var searchText = request.TxtSearch.Trim();
            query = query.Where(m => m.MissionName.Contains(searchText));
        }

        // Get total count before pagination
        var total = await query.CountAsync();

        // Order by: running missions first (Running, Pausing, Resuming), then by CreatedAt descending
        var orderedQuery = query
            .OrderByDescending(m => m.State == ScriptMissionState.Running || 
                                   m.State == ScriptMissionState.Pausing || 
                                   m.State == ScriptMissionState.Resuming)
            .ThenByDescending(m => m.CreatedAt);

        // Apply pagination
        var items = await orderedQuery
            .Skip((request.Page - 1) * request.Size)
            .Take(request.Size)
            .Select(m => new InstanceMissionDto
            {
                Id = m.Id,
                MissionName = m.MissionName,
                Parameters = m.Parameters ?? "{}",
                CreatedAt = m.CreatedAt,
                State = m.State,
                TotalScore = m.TotalScore,
                Score = m.Score,
                StoppedAt = m.StoppedAt,
                Log = m.Log
            })
            .ToArrayAsync();

        return new SearchResult<InstanceMissionDto>(total, request.Page, request.Size, items);
    }

    /// <summary>
    /// Gets the log for a specific instance mission.
    /// </summary>
    public async Task<string?> GetInstanceMissionLog(Guid missionId)
    {
        var mission = await _dbContext.InstanceMissions.FindAsync([missionId]);
        return mission?.Log;
    }

    /// <summary>
    /// Cancels a running or paused mission.
    /// </summary>
    public Task<MessageResult> CancelMission(Guid missionId, string reason)
    {
        var mission = _missionManager.GetMission(missionId);
        if (mission == null)
        {
            return Task.FromResult(new MessageResult(false, "Mission not found"));
        }

        try
        {
            if (mission.State != ScriptMissionState.Running && 
                mission.State != ScriptMissionState.Paused &&
                mission.State != ScriptMissionState.Pausing)
            {
                return Task.FromResult(new MessageResult(false, $"Mission is in {mission.State} state and cannot be canceled"));
            }

            mission.Cancel(reason);
            return Task.FromResult(new MessageResult(true, $"Mission canceled{(string.IsNullOrWhiteSpace(reason) ? "" : $": {reason}")}"));
        }
        catch (Exception ex)
        {
            return Task.FromResult(new MessageResult(false, $"Failed to cancel mission: {ex.Message}"));
        }
    }

    /// <summary>
    /// Pauses a running mission.
    /// </summary>
    public Task<MessageResult> PauseMission(Guid missionId)
    {
        var mission = _missionManager.GetMission(missionId);
        if (mission == null)
        {
            return Task.FromResult(new MessageResult(false, "Mission not found"));
        }

        try
        {
            if (mission.State != ScriptMissionState.Running)
            {
                return Task.FromResult(new MessageResult(false, $"Mission is in {mission.State} state and cannot be paused"));
            }

            mission.Pause();
            return Task.FromResult(new MessageResult(true, "Mission paused"));
        }
        catch (Exception ex)
        {
            return Task.FromResult(new MessageResult(false, $"Failed to pause mission: {ex.Message}"));
        }
    }

    /// <summary>
    /// Resumes a paused mission.
    /// </summary>
    public Task<MessageResult> ResumeMission(Guid missionId)
    {
        var mission = _missionManager.GetMission(missionId);
        if (mission == null)
        {
            return Task.FromResult(new MessageResult(false, "Mission not found"));
        }

        try
        {
            if (mission.State != ScriptMissionState.Paused)
            {
                return Task.FromResult(new MessageResult(false, $"Mission is in {mission.State} state and cannot be resumed"));
            }

            mission.Resume();
            return Task.FromResult(new MessageResult(true, "Mission resumed"));
        }
        catch (Exception ex)
        {
            return Task.FromResult(new MessageResult(false, $"Failed to resume mission: {ex.Message}"));
        }
    }
}