package tools

import (
	"context"
	"fmt"
)

// MatrixSender is the interface for sending Matrix messages.
// Satisfied by shell/matrix.Client.
type MatrixSender interface {
	SendText(ctx context.Context, roomID, text string) error
}

// NewMatrixSend creates a matrix_send tool that sends a message to a Matrix room.
func NewMatrixSend(sender MatrixSender) Tool {
	return Tool{
		Def: Def{
			Name:        "matrix_send",
			Description: "Send a text message to a Matrix room.",
			Parameters: []Param{
				{Name: "room_id", Type: "string", Description: "The Matrix room ID to send to", Required: true},
				{Name: "message", Type: "string", Description: "The text message to send", Required: true},
			},
		},
		Exec: func(ctx context.Context, args map[string]any) Result {
			roomID := getString(args, "room_id")
			message := getString(args, "message")
			if roomID == "" || message == "" {
				return Result{Err: fmt.Errorf("matrix_send: room_id and message are required")}
			}

			if err := sender.SendText(ctx, roomID, message); err != nil {
				return Result{Err: fmt.Errorf("matrix_send: %w", err)}
			}

			return Result{Output: fmt.Sprintf("message sent to %s", roomID)}
		},
	}
}