import * as ACTIONS from 'constants/action_types';
import Lbry from 'lbry';
import querystring from 'querystring';

const Lbryio = {
  enabled: true,
  authenticationPromise: null,
  exchangePromise: null,
  exchangeLastFetched: null,
  CONNECTION_STRING: 'https://api.lbry.com/',
};

const EXCHANGE_RATE_TIMEOUT = 20 * 60 * 1000;
const INTERNAL_APIS_DOWN = 'internal_apis_down';

// We can't use env's because they aren't passed into node_modules
Lbryio.setLocalApi = endpoint => {
  Lbryio.CONNECTION_STRING = endpoint.replace(/\/*$/, '/'); // exactly one slash at the end;
};

Lbryio.call = (resource, action, params = {}, method = 'get') => {
  if (!Lbryio.enabled) {
    return Promise.reject(new Error(__('LBRY internal API is disabled')));
  }

  if (!(method === 'get' || method === 'post')) {
    return Promise.reject(new Error(__('Invalid method')));
  }

  function checkAndParse(response) {
    if (response.status >= 200 && response.status < 300) {
      return response.json();
    }

    if (response.status === 500) {
      return Promise.reject(INTERNAL_APIS_DOWN);
    }

    if (response)
      return response.json().then(json => {
        let error;
        if (json.error) {
          error = new Error(json.error);
        } else {
          error = new Error('Unknown API error signature');
        }
        error.response = response; // This is primarily a hack used in actions/user.js
        return Promise.reject(error);
      });
  }

  function makeRequest(url, options) {
    return fetch(url, options).then(checkAndParse);
  }

  return Lbryio.getAuthToken().then(token => {
    const fullParams = { auth_token: token, ...params };
    Object.keys(fullParams).forEach(key => {
      const value = fullParams[key];
      if (typeof value === 'object') {
        fullParams[key] = JSON.stringify(value);
      }
    });

    const qs = querystring.stringify(fullParams);
    let url = `${Lbryio.CONNECTION_STRING}${resource}/${action}?${qs}`;

    let options = {
      method: 'GET',
    };

    if (method === 'post') {
      options = {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: qs,
      };
      url = `${Lbryio.CONNECTION_STRING}${resource}/${action}`;
    }

    return makeRequest(url, options).then(response => response.data);
  });
};

Lbryio.authToken = null;

Lbryio.getAuthToken = () =>
  new Promise(resolve => {
    if (Lbryio.authToken) {
      resolve(Lbryio.authToken);
    } else if (Lbryio.overrides.getAuthToken) {
      Lbryio.overrides.getAuthToken().then(token => {
        resolve(token);
      });
    } else if (typeof window !== 'undefined') {
      const { store } = window;
      if (store) {
        const state = store.getState();
        const token = state.auth ? state.auth.authToken : null;
        Lbryio.authToken = token;
        resolve(token);
      }

      resolve(null);
    } else {
      resolve(null);
    }
  });

Lbryio.getCurrentUser = () => Lbryio.call('user', 'me');

Lbryio.authenticate = (domain, language) => {
  if (!Lbryio.enabled) {
    const params = {
      id: 1,
      primary_email: 'disabled@lbry.io',
      has_verified_email: true,
      is_identity_verified: true,
      is_reward_approved: false,
      language: language || 'en',
    };

    return new Promise(resolve => {
      resolve(params);
    });
  }

  if (Lbryio.authenticationPromise === null) {
    Lbryio.authenticationPromise = new Promise((resolve, reject) => {
      Lbryio.getAuthToken()
        .then(token => {
          if (!token || token.length > 60) {
            return false;
          }

          // check that token works
          return Lbryio.getCurrentUser()
            .then(user => user)
            .catch(error => {
              if (error === INTERNAL_APIS_DOWN) {
                throw new Error('Internal APIS down');
              }

              return false;
            });
        })
        .then(user => {
          if (user) {
            return user;
          }

          return Lbry.status()
            .then(
              status =>
                new Promise((res, rej) => {
                  const appId = status.installation_id;
                  Lbryio.call(
                    'user',
                    'new',
                    {
                      auth_token: '',
                      language: language || 'en',
                      app_id: appId,
                    },
                    'post'
                  )
                    .then(response => {
                      if (!response.auth_token) {
                        throw new Error('auth_token was not set in the response');
                      }

                      const { store } = window;
                      if (Lbryio.overrides.setAuthToken) {
                        Lbryio.overrides.setAuthToken(response.auth_token);
                      }

                      if (store) {
                        store.dispatch({
                          type: ACTIONS.GENERATE_AUTH_TOKEN_SUCCESS,
                          data: { authToken: response.auth_token },
                        });
                      }
                      Lbryio.authToken = response.auth_token;
                      return res(response);
                    })
                    .catch(error => rej(error));
                })
            )
            .then(newUser => {
              if (!newUser) {
                return Lbryio.getCurrentUser();
              }
              return newUser;
            });
        })
        .then(resolve, reject);
    });
  }

  return Lbryio.authenticationPromise;
};

Lbryio.getStripeToken = () =>
  Lbryio.CONNECTION_STRING.startsWith('http://localhost:')
    ? 'pk_test_NoL1JWL7i1ipfhVId5KfDZgo'
    : 'pk_live_e8M4dRNnCCbmpZzduEUZBgJO';

Lbryio.getExchangeRates = () => {
  if (
    !Lbryio.exchangeLastFetched ||
    Date.now() - Lbryio.exchangeLastFetched > EXCHANGE_RATE_TIMEOUT
  ) {
    Lbryio.exchangePromise = new Promise((resolve, reject) => {
      Lbryio.call('lbc', 'exchange_rate', {}, 'get', true)
        .then(({ lbc_usd: LBC_USD, lbc_btc: LBC_BTC, btc_usd: BTC_USD }) => {
          const rates = { LBC_USD, LBC_BTC, BTC_USD };
          resolve(rates);
        })
        .catch(reject);
    });
    Lbryio.exchangeLastFetched = Date.now();
  }
  return Lbryio.exchangePromise;
};

// Allow overriding lbryio methods
// The desktop app will need to use it for getAuthToken because we use electron's ipcRenderer
Lbryio.overrides = {};
Lbryio.setOverride = (methodName, newMethod) => {
  Lbryio.overrides[methodName] = newMethod;
};

export default Lbryio;