using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using LittleShop.Data;
using LittleShop.Models;

namespace LittleShop.Areas.Admin.Controllers;

[Area("Admin")]
[Authorize(Policy = "AdminOnly")]
public class BotActivityController : Controller
{
    private readonly LittleShopContext _context;

    public BotActivityController(LittleShopContext context)
    {
        _context = context;
    }

    public IActionResult LiveView()
    {
        return View();
    }

    [HttpGet]
    public async Task<IActionResult> GetRecentActivities(int count = 50)
    {
        var activities = await _context.BotActivities
            .Include(a => a.Bot)
            .Include(a => a.Product)
            .OrderByDescending(a => a.Timestamp)
            .Take(count)
            .Select(a => new
            {
                a.Id,
                a.UserDisplayName,
                a.ActivityType,
                a.ActivityDescription,
                a.ProductName,
                a.CategoryName,
                a.Value,
                a.Quantity,
                a.Platform,
                a.Location,
                a.Timestamp,
                BotName = a.Bot.Name,
                TimeAgo = GetTimeAgo(a.Timestamp)
            })
            .ToListAsync();

        return Json(activities);
    }

    [HttpGet]
    public async Task<IActionResult> GetActiveUsers()
    {
        var cutoff = DateTime.UtcNow.AddMinutes(-5); // Users active in last 5 minutes

        var activeUsers = await _context.BotActivities
            .Where(a => a.Timestamp >= cutoff)
            .GroupBy(a => new { a.SessionIdentifier, a.UserDisplayName })
            .Select(g => new
            {
                SessionId = g.Key.SessionIdentifier,
                UserName = g.Key.UserDisplayName,
                ActivityCount = g.Count(),
                LastActivity = g.Max(a => a.Timestamp),
                LastAction = g.OrderByDescending(a => a.Timestamp).FirstOrDefault()!.ActivityDescription,
                TotalValue = g.Sum(a => a.Value ?? 0)
            })
            .OrderByDescending(u => u.LastActivity)
            .ToListAsync();

        return Json(activeUsers);
    }

    [HttpGet]
    public async Task<IActionResult> GetStatistics()
    {
        var today = DateTime.UtcNow.Date;
        var yesterday = today.AddDays(-1);

        var stats = new
        {
            TodayActivities = await _context.BotActivities
                .Where(a => a.Timestamp >= today)
                .CountAsync(),

            YesterdayActivities = await _context.BotActivities
                .Where(a => a.Timestamp >= yesterday && a.Timestamp < today)
                .CountAsync(),

            UniqueUsersToday = await _context.BotActivities
                .Where(a => a.Timestamp >= today)
                .Select(a => a.SessionIdentifier)
                .Distinct()
                .CountAsync(),

            PopularProducts = await _context.BotActivities
                .Where(a => a.ProductId != null && a.Timestamp >= today.AddDays(-7))
                .GroupBy(a => new { a.ProductId, a.ProductName })
                .Select(g => new
                {
                    ProductName = g.Key.ProductName,
                    ViewCount = g.Count(a => a.ActivityType == "ViewProduct"),
                    AddToCartCount = g.Count(a => a.ActivityType == "AddToCart")
                })
                .OrderByDescending(p => p.ViewCount + p.AddToCartCount)
                .Take(5)
                .ToListAsync(),

            ActivityByHour = await _context.BotActivities
                .Where(a => a.Timestamp >= today)
                .GroupBy(a => a.Timestamp.Hour)
                .Select(g => new
                {
                    Hour = g.Key,
                    Count = g.Count()
                })
                .OrderBy(h => h.Hour)
                .ToListAsync()
        };

        return Json(stats);
    }

    private static string GetTimeAgo(DateTime timestamp)
    {
        var span = DateTime.UtcNow - timestamp;

        if (span.TotalSeconds < 60)
            return "just now";
        if (span.TotalMinutes < 60)
            return $"{(int)span.TotalMinutes}m ago";
        if (span.TotalHours < 24)
            return $"{(int)span.TotalHours}h ago";
        if (span.TotalDays < 7)
            return $"{(int)span.TotalDays}d ago";

        return timestamp.ToString("MMM dd");
    }
}