// To explain succinctly, the people who designed AudioWorklet and
// deprecated ScriptProcessorNode are retarded and we need a worklet
// that does basically nothing

// Must be careful to create as little garbage as possible otherwise
// even this will produce cracks/pops/clicks/blips.
// It was like this on Firefox; Chromium managed.

class RawPCMWorklet extends AudioWorkletProcessor {
	constructor() {
		super()
		
		this.ringL = new Float32Array(65536)
		this.ringR = new Float32Array(65536)
		this.ringWrite = 0
		this.ringRead = 0
		
		for(var z = 0; z < 65536; z++) {
			this.ringL[z] = Math.sin(z / 128 * 2 * Math.PI) * 0.3
		}
		
		this.port.onmessage = (event) => {
			var newaudioframes = event.data
			
			var newlen = newaudioframes.left.length
			
			if(newaudioframes.left.length > this.ringL.length) {
				newaudioframes.left = newaudioframes.left.slice(newaudioframes.left.length - this.ringL.length)
				newaudioframes.right = newaudioframes.right.slice(newaudioframes.right.length - this.ringL.length)
			}
			
			if(this.ringWrite % this.ringL.length + newaudioframes.left.length <= this.ringL.length) {
				this.ringL.set(newaudioframes.left, this.ringWrite % this.ringL.length)
				this.ringR.set(newaudioframes.right, this.ringWrite % this.ringL.length)
			} else {
				var boundary = this.ringL.length - this.ringWrite % this.ringL.length
				
				this.ringL.set(newaudioframes.left.slice(0, boundary), this.ringWrite % this.ringL.length)
				this.ringL.set(newaudioframes.left.slice(boundary), 0)
				
				this.ringR.set(newaudioframes.right.slice(0, boundary), this.ringWrite % this.ringL.length)
				this.ringR.set(newaudioframes.right.slice(boundary), 0)
			}
			
			this.ringWrite += newlen
			
			console.log(this.ringWrite - this.ringRead)
		}
	}

	process(inputs, outputs, parameters) {
		const output = outputs[0]
		
		var left = output[0]
		var right = output[1]
		
		/*if(this.ringWrite < 16384) {
			return true
		}*/
		
		var available = Math.min(left.length, Math.max(0, this.ringWrite - this.ringRead))
		
		if(this.ringRead % this.ringL.length + available <= this.ringL.length) {
			left.set(this.ringL.slice(this.ringRead % this.ringL.length, this.ringRead % this.ringL.length + available))
			right.set(this.ringR.slice(this.ringRead % this.ringL.length, this.ringRead % this.ringL.length + available))
		} else {
			left.set(this.ringL.slice(this.ringRead % this.ringL.length))
			right.set(this.ringR.slice(this.ringRead % this.ringL.length))
			
			var boundary = this.ringL.length - this.ringRead % this.ringL.length
			
			left.set(this.ringL.slice(0, available - boundary), boundary)
			right.set(this.ringR.slice(0, available - boundary), boundary)
		}
		
		this.ringRead += left.length
		
		/*for(var s = 0; s < available; s++) {
			var sw = Math.sin((this.debug + s) / 48000 * 440 * 2 * 3.1415926) * 0.3
			left[s] = sw
			right[s] = sw
		}
		this.debug += available*/
		
		return true
	}
}

registerProcessor('rawpcmworklet', RawPCMWorklet);