using NozCli.Core.Client;
using NozCli.Repl;
using Spectre.Console;

namespace NozCli.Commands;

public class LinkCommand : ICommand
{
    public string Name        => "link";
    public string Description => "Add a wikilink from one note to another (builds the graph)";
    public string Usage       => "link <source> <target> [--both] [--section \"Siehe auch\"]";

    public async Task ExecuteAsync(string[] args, ReplContext ctx, CancellationToken ct = default)
    {
        var both    = args.Contains("--both");
        var section = ParseFlag(args, "--section") ?? "Siehe auch";
        var positional = args.Where(a => !a.StartsWith('-')).ToArray();

        if (positional.Length < 2)
        {
            AnsiConsole.MarkupLine("[red]Usage:[/] link <source> <target> [--both] [--section \"Heading\"]");
            return;
        }

        var source = ctx.ResolveSlug(positional[0]);
        var target = ctx.ResolveSlug(positional[1]);

        if (source == target)
        {
            AnsiConsole.MarkupLine("[yellow]Quelle und Ziel sind identisch.[/]");
            return;
        }

        await LinkOneWay(ctx.Api, source, target, section, ct);

        if (both)
            await LinkOneWay(ctx.Api, target, source, section, ct);
    }

    private static async Task LinkOneWay(
        NozCli.Core.Client.NozApiClient api,
        string source, string target, string section, CancellationToken ct)
    {
        NozCli.Core.Models.NoteContent note = default!;
        await AnsiConsole.Status().StartAsync($"Lese {source}…", async _ =>
            note = await api.GetNoteAsync(source, ct));

        var updated = NoteLinkHelper.AddLink(note.Markdown, target, section);

        if (updated == note.Markdown)
        {
            AnsiConsole.MarkupLine($"[dim]{source}[/] → [dim]{target}[/] [yellow]bereits verlinkt[/]");
            return;
        }

        await AnsiConsole.Status().StartAsync($"Aktualisiere {source}…", async _ =>
            await api.PutNoteAsync(source, updated, ct));

        AnsiConsole.MarkupLine($"[green]✓[/] [cyan]{source}[/] → [cyan]{target}[/] verlinkt");
    }

    private static string? ParseFlag(string[] args, string flag)
    {
        var idx = Array.IndexOf(args, flag);
        return idx >= 0 && idx + 1 < args.Length ? args[idx + 1] : null;
    }
}