using TeamUp.SharedKernel.Domain;

namespace TeamUp.Modules.OrgBoard.Domain;

/// <summary>A board task. Humans and AI share this one model — the assignee is a member or an agent.</summary>
internal sealed class WorkItem : Entity
{
    public Guid TeamId { get; private set; }
    public string Title { get; private set; } = null!;
    public string? Description { get; private set; }
    public WorkItemType Type { get; private set; }
    public WorkItemStatus Status { get; private set; }
    public AssigneeKind AssigneeKind { get; private set; }
    public Guid? AssigneeId { get; private set; }
    public Guid? ParentId { get; private set; }
    public Guid CreatedByMemberId { get; private set; }
    public DateTimeOffset CreatedAtUtc { get; private set; }
    public DateTimeOffset UpdatedAtUtc { get; private set; }

    private WorkItem()
    {
    }

    public WorkItem(
        Guid teamId,
        string title,
        string? description,
        WorkItemType type,
        Guid createdByMemberId,
        DateTimeOffset nowUtc,
        Guid? parentId = null)
    {
        TeamId = teamId;
        Title = title;
        Description = description;
        Type = type;
        Status = WorkItemStatus.Backlog;
        AssigneeKind = AssigneeKind.Unassigned;
        CreatedByMemberId = createdByMemberId;
        ParentId = parentId;
        CreatedAtUtc = nowUtc;
        UpdatedAtUtc = nowUtc;
    }

    public void MoveTo(WorkItemStatus status, DateTimeOffset nowUtc)
    {
        Status = status;
        UpdatedAtUtc = nowUtc;
    }

    public void AssignToMember(Guid memberId, DateTimeOffset nowUtc)
    {
        AssigneeKind = AssigneeKind.Member;
        AssigneeId = memberId;
        UpdatedAtUtc = nowUtc;
    }

    public void Unassign(DateTimeOffset nowUtc)
    {
        AssigneeKind = AssigneeKind.Unassigned;
        AssigneeId = null;
        UpdatedAtUtc = nowUtc;
    }

    /// <summary>Appends an approved agent artifact (spec / test plan) to the task.</summary>
    public void AttachArtifact(string content, DateTimeOffset nowUtc)
    {
        Description = string.IsNullOrWhiteSpace(Description)
            ? content
            : Description + "\n\n---\n\n" + content;
        UpdatedAtUtc = nowUtc;
    }
}