package sway

import (
	"context"
	"encoding/binary"
	"encoding/json"
	"fmt"
	"io"
)

func (c *Client) GetOutputs(ctx context.Context) ([]Output, error) {
	c.Lock()
	defer c.Unlock()

	if _, err := fmt.Fprint(c.conn, "i3-ipc"); err != nil {
		return nil, err
	}

	if err := binary.Write(c.conn, binary.LittleEndian, uint32(0)); err != nil {
		return nil, err
	}

	if err := binary.Write(c.conn, binary.LittleEndian, uint32(3)); err != nil {
		return nil, err
	}

	if _, err := c.conn.Read(make([]byte, 6)); err != nil {
		return nil, err
	}

	var length uint32
	if err := binary.Read(c.conn, binary.LittleEndian, &length); err != nil {
		return nil, err
	}

	var messageType uint32
	if err := binary.Read(c.conn, binary.LittleEndian, &messageType); err != nil {
		return nil, err
	}

	results := []Output{}
	if err := json.NewDecoder(io.LimitReader(c.conn, int64(length))).Decode(&results); err != nil {
		return nil, err
	}

	return results, nil
}