let blockchain = new URLSearchParams(window.location.search).get('blockchain') || "tezos"
let contract = new URLSearchParams(window.location.search).get('contract') || ""
let tokenID = new URLSearchParams(window.location.search).get('token_id') || ""

function blockchainAlias(blockchain) {
  switch (blockchain) {
    case "tezos":
      return "tez"
    case "ethereum":
      return "eth"
    default:
      return "tez"
  }
}

let xhrParams = JSON.stringify({
  "ids": [
    [blockchainAlias(blockchain), contract, tokenID].join("-")
  ]
})

let xhr = new XMLHttpRequest();
let url = 'https://indexer.autonomy.io/nft/query';
xhr.open('POST', url);
//Send the proper header information along with the request
xhr.setRequestHeader('content-type', 'application/json');
xhr.onreadystatechange = function () { //Call a function when the state changes.
  if (xhr.readyState == 4) {
    if (xhr.status == 200) {
      let tokens = JSON.parse(xhr.responseText)
      if (tokens.length == 0) {
        window.dispatchEvent(new CustomEvent("provenance-request-error", {
          "detail": {
            error: new Error("token not found")
          }
        }))
        return
      }
      window.dispatchEvent(new CustomEvent("provenance-ready", {
        "detail": {
          provenances: tokens[0].provenance
        }
      }))
    } else {
      window.dispatchEvent(new CustomEvent("provenance-request-error", {
        "detail": {
          error: new Error("response is not ok. status: " + xhr.status)
        }
      }))
    }
  }
}

xhr.onerror = function (e) {
  window.dispatchEvent(new CustomEvent("provenance-request-error", {
    "detail": {
      error: new Error("Unknown Error: server response not received")
    }
  }))
};

xhr.send(xhrParams);