using System.Text.Json;

namespace backend.Tools;

public class SetVolumeTool : ITool
{
    public string Name => "set_volume";
    public string Description =>
        "Sets the assistant's audio output volume on the device. Level is 0..100.";
    public bool RunsDuringResponse => true;

    public JsonElement ParameterSchema { get; } = JsonDocument.Parse(
        """
        {
          "type":"object",
          "properties":{"level":{"type":"integer","minimum":0,"maximum":100}},
          "required":["level"]
        }
        """).RootElement;

    public async Task<ToolResult> ExecuteAsync(ToolInvocation invocation, DeviceContext device, CancellationToken ct)
    {
        if (!invocation.Arguments.TryGetProperty("level", out var lvlEl)
            || !lvlEl.TryGetInt32(out var level)
            || level < 0 || level > 100)
        {
            var err = JsonDocument.Parse("""{"ok":false,"error":"level must be an integer in 0..100"}""").RootElement;
            return new ToolResult(err);
        }

        var piReply = await device.Channel.CallPiToolAsync(Name, invocation.Arguments, ct);
        return new ToolResult(piReply);
    }
}