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') || ""
let tokenIDHash = new URLSearchParams(window.location.search).get('token_id_hash') || ""

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

function simpleHTTPRequest(url, method, body) {
  return new Promise(function (resolve, reject) {
    let xhr = new XMLHttpRequest();
    xhr.open(method, url);

    let xhrParams = (body) ? JSON.stringify(body) : null
    if (xhrParams) {
      xhr.setRequestHeader('content-type', 'application/json');
    }
    xhr.onreadystatechange = function () { //Call a function when the state changes.
      if (xhr.readyState == 4) {
        if (xhr.status >= 200 && xhr.status < 400) {
          resolve(JSON.parse(xhr.responseText))
        } else {
          reject(new Error("response is not ok. status: " + xhr.status))
        }
      }
    }

    xhr.onerror = function (e) {
      reject(e)
    };
    xhr.send(xhrParams);
  })
}

function loadProvenance() {
  let url = 'https://indexer.autonomy.io/nft/query';

  let indexID = (blockchain && contract && tokenID) ? [blockchainAlias(blockchain),
    contract, tokenID
  ].join("-") : "tez-KT1U6EHmNxJTkvaWJ4ThczG4FSDaHC21ssvi-941349"

  let reqBody = {
    "ids": [indexID]
  }

  simpleHTTPRequest(url, "POST", reqBody)
    .then(function (data) {
      if (data.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: data[0].provenance
        }
      }))
    }).catch(function (error) {
      window.dispatchEvent(new CustomEvent("provenance-request-error", {
        "detail": {
          error: error
        }
      }))
    })
}

function loadBlockchainInfo() {
  simpleHTTPRequest("https://api.blockcypher.com/v1/eth/main", "GET")
    .then(function (data) {
      window.dispatchEvent(new CustomEvent("blockchain-info-ready", {
        "detail": {
          height: data.height
        }
      }))
    }).catch(function (error) {
      window.dispatchEvent(new CustomEvent("blockchain-info-request-error", {
        "detail": {
          error: error
        }
      }))
    })
}

function ffinit() {
  loadProvenance()
  loadBlockchainInfo()
}