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

namespace AxCopilot.Services.Agent;

public sealed class TaskGetTool : IAgentTool
{
    public string Name => "task_get";

    public string Description => "Get a task by id from the workspace task board.";

    public ToolParameterSchema Parameters => new()
    {
        Properties = new()
        {
            ["id"] = new() { Type = "integer", Description = "Task id" }
        },
        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 task = TaskBoardStore.Load(context.WorkFolder).FirstOrDefault(t => t.Id == id);
        if (task == null)
            return Task.FromResult(ToolResult.Fail($"Task #{id} not found."));

        var sb = new StringBuilder();
        sb.AppendLine($"#{task.Id} {task.Title}");
        sb.AppendLine($"status: {task.Status}");
        sb.AppendLine($"priority: {task.Priority}");
        if (!string.IsNullOrWhiteSpace(task.Description))
            sb.AppendLine($"description: {task.Description}");
        if (!string.IsNullOrWhiteSpace(task.Output))
            sb.AppendLine($"output: {task.Output}");
        sb.AppendLine($"updatedAt: {task.UpdatedAt:yyyy-MM-dd HH:mm:ss}");
        return Task.FromResult(ToolResult.Ok(sb.ToString()));
    }
}