using System;
using System.Threading.Tasks;
using LittleShop.Data;
using LittleShop.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

namespace LittleShop.Controllers
{
    [ApiController]
    [Route("api/bot")]
    public class BotController : ControllerBase
    {
        private readonly LittleShopContext _context;
        private readonly ILogger<BotController> _logger;

        public BotController(LittleShopContext context, ILogger<BotController> logger)
        {
            _context = context;
            _logger = logger;
        }

        [HttpPost("activity")]
        public async Task<IActionResult> TrackActivity([FromBody] BotActivityDto activity)
        {
            try
            {
                // Get the default bot ID (TeleBot) - we can enhance this to support multiple bots later
                var bot = await _context.Bots.FirstOrDefaultAsync(b => b.Type == Enums.BotType.Telegram);
                if (bot == null)
                {
                    // Create a default TeleBot entry if not exists
                    bot = new Bot
                    {
                        Id = Guid.NewGuid(),
                        BotKey = "telebot-default",
                        Name = "TeleBot",
                        Type = Enums.BotType.Telegram,
                        Status = Enums.BotStatus.Active,
                        IsActive = true,
                        LastSeenAt = DateTime.UtcNow,
                        CreatedAt = DateTime.UtcNow,
                        PlatformUsername = "telebot",
                        PlatformDisplayName = "TeleBot",
                        Version = "1.0.0"
                    };
                    _context.Bots.Add(bot);
                    await _context.SaveChangesAsync();
                }

                var botActivity = new BotActivity
                {
                    Id = Guid.NewGuid(),
                    BotId = bot.Id,
                    SessionIdentifier = activity.SessionIdentifier,
                    UserDisplayName = activity.UserDisplayName,
                    ActivityType = activity.ActivityType,
                    ActivityDescription = activity.ActivityDescription,
                    ProductId = activity.ProductId,
                    ProductName = activity.ProductName ?? string.Empty,
                    CategoryName = activity.CategoryName ?? string.Empty,
                    Value = activity.Value,
                    Quantity = activity.Quantity,
                    Platform = activity.Platform,
                    Location = activity.Location,
                    Timestamp = activity.Timestamp ?? DateTime.UtcNow
                };

                _context.BotActivities.Add(botActivity);
                await _context.SaveChangesAsync();

                _logger.LogInformation("Tracked bot activity: {Type} by {User} on {Platform}",
                    activity.ActivityType, activity.UserDisplayName, activity.Platform);

                return Ok(new { success = true, activityId = botActivity.Id });
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error tracking bot activity");
                return StatusCode(500, new { success = false, error = "Failed to track activity" });
            }
        }

        [HttpGet("activity/stats")]
        public async Task<IActionResult> GetActivityStats()
        {
            var now = DateTime.UtcNow;
            var oneDayAgo = now.AddDays(-1);
            var oneHourAgo = now.AddHours(-1);
            var fiveMinutesAgo = now.AddMinutes(-5);

            var stats = new
            {
                TotalActivities = await _context.BotActivities.CountAsync(),
                Last24Hours = await _context.BotActivities.CountAsync(a => a.Timestamp >= oneDayAgo),
                LastHour = await _context.BotActivities.CountAsync(a => a.Timestamp >= oneHourAgo),
                ActiveNow = await _context.BotActivities.CountAsync(a => a.Timestamp >= fiveMinutesAgo),
                UniqueUsersToday = await _context.BotActivities
                    .Where(a => a.Timestamp >= oneDayAgo)
                    .Select(a => a.SessionIdentifier)
                    .Distinct()
                    .CountAsync(),
                TopActivities = await _context.BotActivities
                    .Where(a => a.Timestamp >= oneDayAgo)
                    .GroupBy(a => a.ActivityType)
                    .Select(g => new { Type = g.Key, Count = g.Count() })
                    .OrderByDescending(x => x.Count)
                    .Take(5)
                    .ToListAsync()
            };

            return Ok(stats);
        }
    }

    public class BotActivityDto
    {
        public string SessionIdentifier { get; set; } = string.Empty;
        public string UserDisplayName { get; set; } = string.Empty;
        public string ActivityType { get; set; } = string.Empty;
        public string ActivityDescription { get; set; } = string.Empty;
        public Guid? ProductId { get; set; }
        public string? ProductName { get; set; }
        public string? CategoryName { get; set; }
        public decimal? Value { get; set; }
        public int? Quantity { get; set; }
        public string Platform { get; set; } = "Unknown";
        public string Location { get; set; } = "Unknown";
        public DateTime? Timestamp { get; set; }
    }
}