using System.Collections.Generic;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace ClaudeDo.Ui.ViewModels.Conflicts;

public sealed partial class ConflictHunk : ObservableObject
{
    public string Ours { get; }
    public string Theirs { get; }
    public string? Base { get; }

    [ObservableProperty] private string? _resolution;

    public bool IsResolved => Resolution is not null;

    public ConflictHunk(string ours, string theirs, string? @base)
    {
        Ours = ours;
        Theirs = theirs;
        Base = @base;
    }

    partial void OnResolutionChanged(string? value) => OnPropertyChanged(nameof(IsResolved));

    [RelayCommand] private void AcceptCurrent()  => Resolution = Ours;
    [RelayCommand] private void AcceptIncoming() => Resolution = Theirs;
    [RelayCommand] private void AcceptBoth()     => Resolution = Ours + Theirs;
    [RelayCommand] private void EditManually()   => Resolution ??= Ours;
}

public sealed class ConflictFile
{
    public string Path { get; }
    public IReadOnlyList<ConflictHunk> Hunks { get; }

    public ConflictFile(string path, IReadOnlyList<ConflictHunk> hunks)
    {
        Path = path;
        Hunks = hunks;
    }

    public bool AllHunksResolved => Hunks.Count > 0 && Hunks.All(h => h.IsResolved);

    /// <summary>Merged file content: concatenation of each hunk's resolution
    /// (single whole-file hunk today; concatenation stays correct for multi-hunk later).</summary>
    public string ComposeResolvedContent() => string.Concat(Hunks.Select(h => h.Resolution));
}