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

namespace Toak.Commands;

public static class HistoryCommand
{
    public static async Task ExecuteAsync(int count, string grep, string export, bool shred, bool verbose)
    {
        Logger.Verbose = verbose;

        var historyManager = new HistoryManager();

        if (shred)
        {
            historyManager.ClearHistory();
            AnsiConsole.MarkupLine("[green]History successfully shredded.[/]");
            return;
        }

        var entries = historyManager.LoadHistory();
        if (entries.Count == 0)
        {
            AnsiConsole.MarkupLine("[yellow]No history found.[/]");
            return;
        }

        // Apply grep filter
        if (!string.IsNullOrWhiteSpace(grep))
        {
            entries = entries.Where(e => 
                e.RawTranscript.Contains(grep, StringComparison.OrdinalIgnoreCase) || 
                e.RefinedText.Contains(grep, StringComparison.OrdinalIgnoreCase))
                .ToList();
            
            if (entries.Count == 0)
            {
                AnsiConsole.MarkupLine($"[yellow]No history entries match '{grep}'.[/]");
                return;
            }
        }

        // Get last N
        entries = entries.OrderBy(e => e.Timestamp).TakeLast(count).ToList();

        // Export
        if (!string.IsNullOrWhiteSpace(export))
        {
            try
            {
                using var writer = new StreamWriter(export);
                writer.WriteLine($"# Toak Transcriptions - {DateTime.Now:yyyy-MM-dd}");
                writer.WriteLine();

                foreach (var entry in entries)
                {
                    writer.WriteLine($"## {entry.Timestamp.ToLocalTime():HH:mm:ss}");
                    writer.WriteLine(entry.RefinedText);
                    writer.WriteLine();
                }

                AnsiConsole.MarkupLine($"[green]Successfully exported {entries.Count} entries to {export}[/]");
            }
            catch (Exception ex)
            {
                AnsiConsole.MarkupLine($"[red]Error exporting history:[/] {ex.Message}");
            }
            return;
        }

        // Display
        var table = new Table().Border(TableBorder.Rounded);
        table.AddColumn("Time");
        table.AddColumn("Skill");
        table.AddColumn("Text");

        foreach (var entry in entries)
        {
            table.AddRow(
                $"[dim]{entry.Timestamp.ToLocalTime():HH:mm:ss}[/]",
                entry.SkillName != null ? $"[blue]{entry.SkillName}[/]" : "-",
                entry.RefinedText.Replace("[", "[[").Replace("]", "]]") // Escape spectre markup
            );
        }

        AnsiConsole.Write(table);
    }
}