using System;
using System.Linq;
using System.Threading.Tasks;
using System.CommandLine;
using Spectre.Console;
using Toak.Core;

namespace Toak.Commands;

public static class StatsCommand
{
    public static async Task ExecuteAsync(bool verbose)
    {
        Logger.Verbose = verbose;

        var entries = HistoryManager.LoadEntries();
        if (entries.Count == 0)
        {
            AnsiConsole.MarkupLine("[yellow]No history found. Cannot generate statistics.[/]");
            return;
        }

        var totalCount = entries.Count;
        var totalDuration = TimeSpan.FromMilliseconds(entries.Sum(e => e.DurationMs));
        var avgDuration = TimeSpan.FromMilliseconds(entries.Average(e => e.DurationMs));
        
        var mostActiveDay = entries
            .GroupBy(e => e.Timestamp.Date)
            .OrderByDescending(g => g.Count())
            .FirstOrDefault();

        var topWords = entries
            .SelectMany(e => e.RefinedText.Split(new[] { ' ', '.', ',', '!', '?' }, StringSplitOptions.RemoveEmptyEntries))
            .Where(w => w.Length > 3) // Exclude short common words
            .GroupBy(w => w.ToLowerInvariant())
            .OrderByDescending(g => g.Count())
            .Take(5)
            .Select(g => g.Key)
            .ToList();

        AnsiConsole.MarkupLine("[bold blue]Toak Usage Statistics[/]");
        AnsiConsole.MarkupLine($"[dim]Total recordings:[/] {totalCount}");
        AnsiConsole.MarkupLine($"[dim]Total duration:[/] {totalDuration.TotalMinutes:F1}m");
        AnsiConsole.MarkupLine($"[dim]Average processing latency:[/] {avgDuration.TotalSeconds:F2}s");
        
        if (mostActiveDay != null)
        {
            AnsiConsole.MarkupLine($"[dim]Most active day:[/] {mostActiveDay.Key:yyyy-MM-dd} ({mostActiveDay.Count()} recordings)");
        }
        
        if (topWords.Count > 0)
        {
            AnsiConsole.MarkupLine($"[dim]Top spoken words (>3 chars):[/] {string.Join(", ", topWords)}");
        }
    }
}