import lbryio from './lbryio.js';
import lighthouse from './lighthouse.js';
import jsonrpc from './jsonrpc.js';
import lbryuri from './lbryuri.js';
import {getLocal, getSession, setSession, setLocal} from './utils.js';

const {remote, ipcRenderer} = require('electron');
const menu = remote.require('./menu/main-menu');

let lbry = {
  isConnected: false,
  daemonConnectionString: 'http://localhost:5279/lbryapi',
  pendingPublishTimeout: 20 * 60 * 1000,
  defaultClientSettings: {
    showNsfw: false,
    showUnavailable: true,
    debug: false,
    useCustomLighthouseServers: false,
    customLighthouseServers: [],
    showDeveloperMenu: false,
  }
};

/**
 * Records a publish attempt in local storage. Returns a dictionary with all the data needed to
 * needed to make a dummy claim or file info object.
 */
function savePendingPublish({name, channel_name}) {
  let uri;
  if (channel_name) {
    uri = lbryuri.build({name: channel_name, path: name}, false);
  } else {
    uri = lbryuri.build({name: name}, false);
  }
  const pendingPublishes = getLocal('pendingPublishes') || [];
  const newPendingPublish = {
    name, channel_name,
    claim_id: 'pending_claim_' + uri,
    txid: 'pending_' + uri,
    nout: 0,
    outpoint: 'pending_' + uri + ':0',
    time: Date.now(),
  };
  setLocal('pendingPublishes', [...pendingPublishes, newPendingPublish]);
  return newPendingPublish;
}

/**
 * If there is a pending publish with the given name or outpoint, remove it.
 * A channel name may also be provided along with name.
 */
function removePendingPublishIfNeeded({name, channel_name, outpoint}) {
  function pubMatches(pub) {
    return pub.outpoint === outpoint || (pub.name === name && (!channel_name || pub.channel_name === channel_name));
  }

  setLocal('pendingPublishes', lbry.getPendingPublishes().filter(pub => !pubMatches(pub)));
}

/**
 * Gets the current list of pending publish attempts. Filters out any that have timed out and
 * removes them from the list.
 */
lbry.getPendingPublishes = function() {
  const pendingPublishes = getLocal('pendingPublishes') || [];
  const newPendingPublishes = pendingPublishes.filter(pub => Date.now() - pub.time <= lbry.pendingPublishTimeout);
  setLocal('pendingPublishes', newPendingPublishes);
  return newPendingPublishes;
}

/**
 * Gets a pending publish attempt by its name or (fake) outpoint. A channel name can also be
 * provided along withe the name. If no pending publish is found, returns null.
 */
function getPendingPublish({name, channel_name, outpoint}) {
  const pendingPublishes = lbry.getPendingPublishes();
  return pendingPublishes.find(
    pub => pub.outpoint === outpoint || (pub.name === name && (!channel_name || pub.channel_name === channel_name))
  ) || null;
}

function pendingPublishToDummyClaim({channel_name, name, outpoint, claim_id, txid, nout}) {
  return {name, outpoint, claim_id, txid, nout, channel_name};
}

function pendingPublishToDummyFileInfo({name, outpoint, claim_id}) {
  return {name, outpoint, claim_id, metadata: null};
}

lbry.call = function (method, params, callback, errorCallback, connectFailedCallback) {
  return jsonrpc.call(lbry.daemonConnectionString, method, params, callback, errorCallback, connectFailedCallback);
}

//core
lbry._connectPromise = null;
lbry.connect = function() {
  if (lbry._connectPromise === null) {

    lbry._connectPromise = new Promise((resolve, reject) => {

      // Check every half second to see if the daemon is accepting connections
      function checkDaemonStarted(tryNum = 0) {
        lbry.isDaemonAcceptingConnections(function (runningStatus) {
          if (runningStatus) {
            resolve(true);
          }
          else {
            if (tryNum <= 600) { // Move # of tries into constant or config option
              setTimeout(function () {
                checkDaemonStarted(tryNum + 1);
              }, tryNum < 100 ? 200 : 1000);
            }
            else {
              reject(new Error("Unable to connect to LBRY"));
            }
          }
        });
      }

      checkDaemonStarted();
    });
  }

  return lbry._connectPromise;
}

lbry.isDaemonAcceptingConnections = function (callback) {
  // Returns true/false whether the daemon is at a point it will start returning status
  lbry.call('status', {}, () => callback(true), null, () => callback(false))
};

lbry.checkAddressIsMine = function(address, callback) {
  lbry.call('address_is_mine', {address: address}, callback);
}

lbry.sendToAddress = function(amount, address, callback, errorCallback) {
  lbry.call("send_amount_to_address", { "amount" : amount, "address": address }, callback, errorCallback);
}

/**
 * Takes a LBRY URI; will first try and calculate a total cost using
 * Lighthouse. If Lighthouse can't be reached, it just retrives the
 * key fee.
 *
 * Returns an object with members:
 *   - cost: Number; the calculated cost of the name
 *   - includes_data: Boolean; indicates whether or not the data fee info
 *     from Lighthouse is included.
 */
lbry.costPromiseCache = {}
lbry.getCostInfo = function(uri) {
  if (lbry.costPromiseCache[uri] === undefined) {
    lbry.costPromiseCache[uri] = new Promise((resolve, reject) => {
      const COST_INFO_CACHE_KEY = 'cost_info_cache';
      let costInfoCache = getSession(COST_INFO_CACHE_KEY, {})

      function cacheAndResolve(cost, includesData) {
        costInfoCache[uri] = {cost, includesData};
        setSession(COST_INFO_CACHE_KEY, costInfoCache);
        resolve({cost, includesData});
      }

      if (!uri) {
        return reject(new Error(`URI required.`));
      }

      if (costInfoCache[uri] && costInfoCache[uri].cost) {
        return resolve(costInfoCache[uri])
      }

      function getCost(uri, size) {
        lbry.stream_cost_estimate({uri, ... size !== null ? {size} : {}}).then((cost) => {
          cacheAndResolve(cost, size !== null);
        }, reject);
      }

      const uriObj = lbryuri.parse(uri);
      const name = uriObj.path || uriObj.name;

      lighthouse.get_size_for_name(name).then((size) => {
        if (size) {
          getCost(name, size);
        }
        else {
          getCost(name, null);
        }
      })
    });
  }
  return lbry.costPromiseCache[uri];
}

/**
 * Publishes a file. The optional fileListedCallback is called when the file becomes available in
 * lbry.file_list() during the publish process.
 *
 * This currently includes a work-around to cache the file in local storage so that the pending
 * publish can appear in the UI immediately.
 */
lbry.publish = function(params, fileListedCallback, publishedCallback, errorCallback) {
  lbry.call('publish', params, (result) => {
    if (returnedPending) {
      return;
    }

    clearTimeout(returnPendingTimeout);
    publishedCallback(result);
  }, (err) => {
    if (returnedPending) {
      return;
    }

    clearTimeout(returnPendingTimeout);
    errorCallback(err);
  });

  let returnedPending = false;
  // Give a short grace period in case publish() returns right away or (more likely) gives an error
  const returnPendingTimeout = setTimeout(() => {
    returnedPending = true;

    if (publishedCallback) {
      savePendingPublish({name: params.name, channel_name: params.channel_name});
      publishedCallback(true);
    }

    if (fileListedCallback) {
      const {name, channel_name} = params;
      savePendingPublish({name: params.name, channel_name: params.channel_name});
      fileListedCallback(true);
    }
  }, 2000);
}


lbry.getClientSettings = function() {
  var outSettings = {};
  for (let setting of Object.keys(lbry.defaultClientSettings)) {
    var localStorageVal = localStorage.getItem('setting_' + setting);
    outSettings[setting] = (localStorageVal === null ? lbry.defaultClientSettings[setting] : JSON.parse(localStorageVal));
  }
  return outSettings;
}

lbry.getClientSetting = function(setting) {
  var localStorageVal = localStorage.getItem('setting_' + setting);
  if (setting == 'showDeveloperMenu')
  {
    return true;
  }
  return (localStorageVal === null ? lbry.defaultClientSettings[setting] : JSON.parse(localStorageVal));
}

lbry.setClientSettings = function(settings) {
  for (let setting of Object.keys(settings)) {
    lbry.setClientSetting(setting, settings[setting]);
  }
}

lbry.setClientSetting = function(setting, value) {
  return localStorage.setItem('setting_' + setting, JSON.stringify(value));
}

lbry.getSessionInfo = function(callback) {
  lbry.call('get_lbry_session_info', {}, callback);
}

lbry.reportBug = function(message, callback) {
  lbry.call('report_bug', {
    message: message
  }, callback);
}

//utilities
lbry.formatCredits = function(amount, precision)
{
  return amount.toFixed(precision || 1).replace(/\.?0+$/, '');
}

lbry.formatName = function(name) {
  // Converts LBRY name to standard format (all lower case, no special characters, spaces replaced by dashes)
  name = name.replace('/\s+/g', '-');
  name = name.toLowerCase().replace(/[^a-z0-9\-]/g, '');
  return name;
}


lbry.imagePath = function(file)
{
  return 'img/' + file;
}

lbry.getMediaType = function(contentType, fileName) {
  if (contentType) {
    return /^[^/]+/.exec(contentType);
  } else if (fileName) {
    var dotIndex = fileName.lastIndexOf('.');
    if (dotIndex == -1) {
      return 'unknown';
    }

    var ext = fileName.substr(dotIndex + 1);
    if (/^mp4|mov|m4v|flv|f4v$/i.test(ext)) {
      return 'video';
    } else if (/^mp3|m4a|aac|wav|flac|ogg$/i.test(ext)) {
      return 'audio';
    } else if (/^html|htm|pdf|odf|doc|docx|md|markdown|txt$/i.test(ext)) {
      return 'document';
    } else {
      return 'unknown';
    }
  } else {
    return 'unknown';
  }
}

lbry.stop = function(callback) {
  lbry.call('stop', {}, callback);
};

lbry._subscribeIdCount = 0;
lbry._balanceSubscribeCallbacks = {};
lbry._balanceSubscribeInterval = 5000;

lbry._balanceUpdateInterval = null;
lbry._updateBalanceSubscribers = function() {
  lbry.get_balance().then(function(balance) {
    for (let callback of Object.values(lbry._balanceSubscribeCallbacks)) {
      callback(balance);
    }
  });

  if (!lbry._balanceUpdateInterval && Object.keys(lbry._balanceSubscribeCallbacks).length) {
    lbry._balanceUpdateInterval = setInterval(() => {
      lbry._updateBalanceSubscribers();
    }, lbry._balanceSubscribeInterval);
  }
}

lbry.balanceSubscribe = function(callback) {
  const subscribeId = ++lbry._subscribeIdCount;
  lbry._balanceSubscribeCallbacks[subscribeId] = callback;
  lbry._updateBalanceSubscribers();
  return subscribeId;
}

lbry.balanceUnsubscribe = function(subscribeId) {
  delete lbry._balanceSubscribeCallbacks[subscribeId];
  if (lbry._balanceUpdateInterval && !Object.keys(lbry._balanceSubscribeCallbacks).length) {
    clearInterval(lbry._balanceUpdateInterval)
  }
}

lbry.showMenuIfNeeded = function() {
  const showingMenu = sessionStorage.getItem('menuShown') || null;
  const chosenMenu = lbry.getClientSetting('showDeveloperMenu') ? 'developer' : 'normal';
  if (chosenMenu != showingMenu) {
    menu.showMenubar(chosenMenu == 'developer');
  }
  sessionStorage.setItem('menuShown', chosenMenu);
};

lbry.getAppVersionInfo = function() {
  return new Promise((resolve, reject) => {
    ipcRenderer.once('version-info-received', (event, versionInfo) => { resolve(versionInfo) });
    ipcRenderer.send('version-info-requested');
  });
}


/**
 * Wrappers for API methods to simulate missing or future behavior. Unlike the old-style stubs,
 * these are designed to be transparent wrappers around the corresponding API methods.
 */

/**
 * Returns results from the file_list API method, plus dummy entries for pending publishes.
 * (If a real publish with the same name is found, the pending publish will be ignored and removed.)
 */
lbry.file_list = function(params={}) {
  return new Promise((resolve, reject) => {
    const {name, channel_name, outpoint} = params;

    /**
     * If we're searching by outpoint, check first to see if there's a matching pending publish.
     * Pending publishes use their own faux outpoints that are always unique, so we don't need
     * to check if there's a real file.
     */
    if (outpoint) {
      const pendingPublish = getPendingPublish({outpoint});
      if (pendingPublish) {
        resolve([pendingPublishToDummyFileInfo(pendingPublish)]);
        return;
      }
    }

    lbry.call('file_list', params, (fileInfos) => {
      removePendingPublishIfNeeded({name, channel_name, outpoint});

      const dummyFileInfos = lbry.getPendingPublishes().map(pendingPublishToDummyFileInfo);
      resolve([...fileInfos, ...dummyFileInfos]);
    }, reject, reject);
  });
}

lbry.claim_list_mine = function(params={}) {
  return new Promise((resolve, reject) => {
    lbry.call('claim_list_mine', params, (claims) => {
      for (let {name, channel_name, txid, nout} of claims) {
        removePendingPublishIfNeeded({name, channel_name, outpoint: txid + ':' + nout});
      }

      const dummyClaims = lbry.getPendingPublishes().map(pendingPublishToDummyClaim);
      resolve([...claims, ...dummyClaims]);
    }, reject, reject)
  });
}

const claimCacheKey = 'resolve_claim_cache';
lbry._claimCache = getSession(claimCacheKey, {});
lbry._resolveXhrs = {}
lbry.resolve = function(params={}) {
  return new Promise((resolve, reject) => {
    if (!params.uri) {
      throw "Resolve has hacked cache on top of it that requires a URI"
    }
    if (params.uri && lbry._claimCache[params.uri] !== undefined) {
      resolve(lbry._claimCache[params.uri]);
    } else {
      lbry._resolveXhrs[params.uri] = lbry.call('resolve', params, function(data) {
        if (data !== undefined) {
          lbry._claimCache[params.uri] = data;
        }
        setSession(claimCacheKey, lbry._claimCache)
        resolve(data)
      }, reject)
    }
  });
}

lbry.cancelResolve = function(params={}) {
  const xhr = lbry._resolveXhrs[params.uri]
  if (xhr && xhr.readyState > 0 && xhr.readyState < 4) {
    xhr.abort()
  }
}

lbry = new Proxy(lbry, {
  get: function(target, name) {
    if (name in target) {
      return target[name];
    }

    return function(params={}) {
      return new Promise((resolve, reject) => {
        jsonrpc.call(lbry.daemonConnectionString, name, params, resolve, reject, reject);
      });
    };
  }
});

export default lbry;