using System.IO;
using System.Linq;
using System.Text.Json;

namespace AxCopilot.Services.Agent;

public sealed class TaskStopTool : IAgentTool
{
    public string Name => "task_stop";

    public string Description => "Stop a task (marks status=stopped) on the workspace task board.";

    public ToolParameterSchema Parameters => new()
    {
        Properties = new()
        {
            ["id"] = new() { Type = "integer", Description = "Task id" },
            ["reason"] = new() { Type = "string", Description = "Stop reason (optional)." }
        },
        Required = ["id"]
    };

    public Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct = default)
    {
        if (!args.SafeTryGetProperty("id", out var idEl))
            return Task.FromResult(ToolResult.Fail("id is required."));
        if (string.IsNullOrWhiteSpace(context.WorkFolder) || !Directory.Exists(context.WorkFolder))
            return Task.FromResult(ToolResult.Fail("valid WorkFolder is required."));

        var id = idEl.GetInt32();
        var reason = args.SafeTryGetProperty("reason", out var reasonEl) ? (reasonEl.SafeGetString() ?? "").Trim() : "";
        var tasks = TaskBoardStore.Load(context.WorkFolder);
        var task = tasks.FirstOrDefault(t => t.Id == id);
        if (task == null)
            return Task.FromResult(ToolResult.Fail($"Task #{id} not found."));

        task.Status = "stopped";
        if (!string.IsNullOrWhiteSpace(reason))
            task.Output = string.IsNullOrWhiteSpace(task.Output) ? $"stop reason: {reason}" : $"{task.Output}\nstop reason: {reason}";
        task.UpdatedAt = DateTime.Now;
        TaskBoardStore.Save(context.WorkFolder, tasks);
        return Task.FromResult(ToolResult.Ok($"Stopped task #{task.Id}: {task.Title}"));
    }
}