window.onload = function () {
    initWasm()
    document.getElementById('input').addEventListener('change', playFile)
}

function playFile() {
    console.log(decode(48000))
    const input = event.target.files[0]

    const reader = new FileReader()
    reader.onload = event => playData(event.target.result)
    reader.onerror = error => reject(error)
    reader.readAsArrayBuffer(input)
}

function playData(array) {
    var data = new Uint8Array(array)
    console.log("playing file")
    var player = new PCMPlayer({
        encoding: '16bitInt',
        channels: 1,
        sampleRate: 48000,
        flushingTime: 2000
    });
    player.feed(data)
}

function initWasm() {
    if (!WebAssembly.instantiateStreaming) {
        // polyfill
        WebAssembly.instantiateStreaming = async (resp, importObject) => {
            const source = await (await resp).arrayBuffer()
            return await WebAssembly.instantiate(source, importObject)
        }
    }

    const go = new Go()
    let mod, inst
    // memoryBytes is an Uint8Array pointing to the webassembly linear memory.
    let memoryBytes;
    console.log("Initializing wasm...")
    WebAssembly.instantiateStreaming(
        fetch('lib.wasm'), go.importObject).then(
        result => {
            mod = result.module
            inst = result.instance
            memoryBytes = new Uint8Array(inst.exports.mem.buffer)
            console.log("Initialization complete.")
            run()
        }
    )

    async function run() {
        await go.run(inst)
        inst = await WebAssembly.instantiate(mod, go.importObject) // reset instance
    }


}