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

namespace AxCopilot.Services.Agent;

public sealed class TaskCreateTool : IAgentTool
{
    public string Name => "task_create";

    public string Description =>
        "Create a tracked task in the workspace task board (.ax/taskboard.json).";

    public ToolParameterSchema Parameters => new()
    {
        Properties = new()
        {
            ["title"] = new() { Type = "string", Description = "Task title" },
            ["description"] = new() { Type = "string", Description = "Task description (optional)" },
            ["priority"] = new() { Type = "string", Description = "high | medium | low", Enum = ["high", "medium", "low"] },
        },
        Required = ["title"]
    };

    public Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct = default)
    {
        var title = args.TryGetProperty("title", out var titleEl) ? (titleEl.GetString() ?? "").Trim() : "";
        if (string.IsNullOrWhiteSpace(title))
            return Task.FromResult(ToolResult.Fail("title is required."));
        if (string.IsNullOrWhiteSpace(context.WorkFolder) || !Directory.Exists(context.WorkFolder))
            return Task.FromResult(ToolResult.Fail("valid WorkFolder is required."));

        var description = args.TryGetProperty("description", out var descEl) ? (descEl.GetString() ?? "").Trim() : "";
        var priority = args.TryGetProperty("priority", out var priEl) ? (priEl.GetString() ?? "medium").Trim().ToLowerInvariant() : "medium";
        if (!TaskBoardStore.IsValidPriority(priority))
            priority = "medium";

        var tasks = TaskBoardStore.Load(context.WorkFolder);
        var id = TaskBoardStore.NextId(tasks);
        tasks.Add(new TaskBoardStore.TaskItem
        {
            Id = id,
            Title = title,
            Description = description,
            Priority = priority,
            Status = "open",
            CreatedAt = DateTime.Now,
            UpdatedAt = DateTime.Now
        });
        TaskBoardStore.Save(context.WorkFolder, tasks);

        return Task.FromResult(ToolResult.Ok($"Created task #{id}: {title} [{priority}]"));
    }
}