package main

import "github.com/veandco/go-sdl2/sdl"

/*
#cgo CFLAGS: -I/home/nick/Downloads/include
#cgo LDFLAGS: -L/home/nick/.local/lib -lprojectM-4
#include "projectM-4/projectM.h"
*/
import "C"

import (
	"bufio"
	"encoding/binary"
	"os"
	"time"
)

func main() {
	if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
		panic(err)
	}
	defer sdl.Quit()

	window, err := sdl.CreateWindow("test", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
		800, 600, sdl.WINDOW_OPENGL)
	if err != nil {
		panic(err)
	}
	defer window.Destroy()

	context, err := window.GLCreateContext()
	if err != nil {
		panic(err)
	}
	defer sdl.GLDeleteContext(context)

	handle := C.projectm_create()
	if handle == nil {
		panic("nil")
	}
	defer C.projectm_destroy(handle)

	C.projectm_set_window_size(handle, 800, 600)

	preset := C.CString("/usr/share/projectM/presets/presets_stock/Zylot - Wisps.milk")
	C.projectm_load_preset_file(handle, preset, false)

	reader := bufio.NewReader(os.Stdin)

	running := true
	for running {
		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
			switch event.(type) {
			case *sdl.QuitEvent:
				println("Quit")
				running = false
				break
			}
		}

		audioData := make([]int16, 2048)

		err = binary.Read(reader, binary.LittleEndian, audioData)
		if err != nil {
			panic(err)
		}

		C.projectm_pcm_add_int16(handle, (*C.int16_t)(&audioData[0]), C.uint(len(audioData)), C.PROJECTM_STEREO)

		C.projectm_opengl_render_frame(handle)
		window.GLSwap()
		time.Sleep(1 / 60 * time.Second)
	}
}