package main

import (
	"embed"
	"fmt"
	"image"
	"image/color"
	"io"

	"github.com/clktmr/n64/drivers/cartfs"
	"github.com/clktmr/n64/drivers/controller"
	"github.com/clktmr/n64/drivers/display"
	"github.com/clktmr/n64/drivers/draw"
	"github.com/clktmr/n64/drivers/rspq/mixer"
	"github.com/clktmr/n64/fonts/gomono12"
	_ "github.com/clktmr/n64/machine"
	"github.com/clktmr/n64/rcp/audio"
	"github.com/clktmr/n64/rcp/serial/joybus"
	"github.com/clktmr/n64/rcp/texture"
	"github.com/clktmr/n64/rcp/video"
)

var (
	//go:embed gopher-anim.CI8 squeak.pcm_s16be
	_tutorialFiles embed.FS
	tutorialFiles  cartfs.FS = cartfs.Embed(_tutorialFiles)
)

var face = gomono12.NewFace()
var background = &image.Uniform{color.RGBA{0x7f, 0x7f, 0xaf, 0x0}}

func main() {
	// Enable video output
	video.Setup(false)

	// Allocate framebuffer
	display := display.NewDisplay(image.Pt(320, 240), video.BPP16)

	controllers := make(chan [4]controller.Controller)
	go func() {
		var states [4]controller.Controller
		for {
			controller.Poll(&states)
			controllers <- states
		}
	}()

	gopherFile, err := tutorialFiles.Open("gopher-anim.CI8")
	if err != nil {
		panic(err)
	}
	gopherTexture, err := texture.Load(gopherFile)
	if err != nil {
		panic(err)
	}
	gopherRect := image.Rect(0, 0, 128, 128)
	blows := 0

	audio.Start(48000)
	mixer.Init()

	go func() {
		audio.Buffer.ReadFrom(mixer.Output)
	}()

	squeakFile, err := tutorialFiles.Open("squeak.pcm_s16be")
	if err != nil {
		panic(err)
	}
	squeakReader := squeakFile.(io.ReadSeeker)
	squeakSource := mixer.NewSource(squeakReader, 16000)

	for {
		fb := display.Swap() // Blocks until next VBlank
		input := <-controllers

		textarea := fb.Bounds().Inset(15)
		pt := textarea.Min.Add(image.Pt(0, int(face.Ascent)))

		draw.Src.Draw(fb, fb.Bounds(), background, fb.Bounds().Min)

		text := fmt.Appendln(nil, "N⁶⁴ - Get N or Get Out ♫")
		text = fmt.Appendln(text, input[0].Down())
		text = fmt.Appendf(text, "blows: %v/8\n", blows)
		pt = draw.DrawText(fb, textarea, face, pt, image.Black, nil, text)

		gopherFrame := image.Point{}
		if blows < 8 {
			if input[0].Pressed()&joybus.ButtonA != 0 {
				blows++
				squeakReader.Seek(0, io.SeekStart)
				mixer.SetSource(0, squeakSource)
			}
			if input[0].Down()&joybus.ButtonA != 0 {
				gopherFrame.X += 128 // blowing gopher
			}
		} else {
			gopherFrame.X += 256 // happy gopher
		}

		draw.Over.Draw(fb, gopherRect.Add(pt), gopherTexture, gopherFrame)

		draw.Flush() // Blocks until everything is drawn
	}
}