import { defineMessages } from 'react-intl';
import api, { baseClient } from '../api';
import { importFetchedAccount } from './importer';
import snackbar from 'soapbox/actions/snackbar';
import { createAccount } from 'soapbox/actions/accounts';
import { fetchMeSuccess, fetchMeFail } from 'soapbox/actions/me';
import { getLoggedInAccount } from 'soapbox/utils/auth';
import { createApp } from 'soapbox/actions/apps';
import { obtainOAuthToken, revokeOAuthToken } from 'soapbox/actions/oauth';

export const SWITCH_ACCOUNT = 'SWITCH_ACCOUNT';

export const AUTH_APP_CREATED    = 'AUTH_APP_CREATED';
export const AUTH_APP_AUTHORIZED = 'AUTH_APP_AUTHORIZED';
export const AUTH_LOGGED_IN      = 'AUTH_LOGGED_IN';
export const AUTH_LOGGED_OUT     = 'AUTH_LOGGED_OUT';

export const VERIFY_CREDENTIALS_REQUEST = 'VERIFY_CREDENTIALS_REQUEST';
export const VERIFY_CREDENTIALS_SUCCESS = 'VERIFY_CREDENTIALS_SUCCESS';
export const VERIFY_CREDENTIALS_FAIL    = 'VERIFY_CREDENTIALS_FAIL';

export const RESET_PASSWORD_REQUEST = 'RESET_PASSWORD_REQUEST';
export const RESET_PASSWORD_SUCCESS = 'RESET_PASSWORD_SUCCESS';
export const RESET_PASSWORD_FAIL    = 'RESET_PASSWORD_FAIL';

export const CHANGE_EMAIL_REQUEST = 'CHANGE_EMAIL_REQUEST';
export const CHANGE_EMAIL_SUCCESS = 'CHANGE_EMAIL_SUCCESS';
export const CHANGE_EMAIL_FAIL    = 'CHANGE_EMAIL_FAIL';

export const DELETE_ACCOUNT_REQUEST = 'DELETE_ACCOUNT_REQUEST';
export const DELETE_ACCOUNT_SUCCESS = 'DELETE_ACCOUNT_SUCCESS';
export const DELETE_ACCOUNT_FAIL    = 'DELETE_ACCOUNT_FAIL';

export const CHANGE_PASSWORD_REQUEST = 'CHANGE_PASSWORD_REQUEST';
export const CHANGE_PASSWORD_SUCCESS = 'CHANGE_PASSWORD_SUCCESS';
export const CHANGE_PASSWORD_FAIL    = 'CHANGE_PASSWORD_FAIL';

const messages = defineMessages({
  loggedOut: { id: 'auth.logged_out', defaultMessage: 'Logged out.' },
  invalidCredentials: { id: 'auth.invalid_credentials', defaultMessage: 'Wrong username or password' },
});

const noOp = () => () => new Promise(f => f());

function createAppAndToken() {
  return (dispatch, getState) => {
    return dispatch(createAuthApp()).then(() => {
      return dispatch(createAppToken());
    });
  };
}

const appName = () => {
  const timestamp = (new Date()).toISOString();
  return `SoapboxFE_${timestamp}`; // TODO: Add commit hash
};

function createAuthApp() {
  return (dispatch, getState) => {
    const params = {
      client_name:   appName(),
      redirect_uris: 'urn:ietf:wg:oauth:2.0:oob',
      scopes:        'read write follow push admin',
    };

    return dispatch(createApp(params)).then(app => {
      return dispatch({ type: AUTH_APP_CREATED, app });
    });
  };
}

function createAppToken() {
  return (dispatch, getState) => {
    const app = getState().getIn(['auth', 'app']);

    const params = {
      client_id:     app.get('client_id'),
      client_secret: app.get('client_secret'),
      redirect_uri:  'urn:ietf:wg:oauth:2.0:oob',
      grant_type:    'client_credentials',
    };

    return dispatch(obtainOAuthToken(params)).then(token => {
      return dispatch({ type: AUTH_APP_AUTHORIZED, app, token });
    });
  };
}

function createUserToken(username, password) {
  return (dispatch, getState) => {
    const app = getState().getIn(['auth', 'app']);

    const params = {
      client_id:     app.get('client_id'),
      client_secret: app.get('client_secret'),
      redirect_uri:  'urn:ietf:wg:oauth:2.0:oob',
      grant_type:    'password',
      username:      username,
      password:      password,
    };

    return dispatch(obtainOAuthToken(params)).then(token => {
      dispatch(authLoggedIn(token));
      return token;
    });
  };
}

export function refreshUserToken() {
  return (dispatch, getState) => {
    const refreshToken = getState().getIn(['auth', 'user', 'refresh_token']);
    const app = getState().getIn(['auth', 'app']);

    if (!refreshToken) return dispatch(noOp());

    const params = {
      client_id:     app.get('client_id'),
      client_secret: app.get('client_secret'),
      refresh_token: refreshToken,
      redirect_uri:  'urn:ietf:wg:oauth:2.0:oob',
      grant_type:    'refresh_token',
    };

    return dispatch(obtainOAuthToken(params)).then(token => {
      dispatch(authLoggedIn(token));
    });
  };
}

export function otpVerify(code, mfa_token) {
  return (dispatch, getState) => {
    const app = getState().getIn(['auth', 'app']);
    return api(getState, 'app').post('/oauth/mfa/challenge', {
      client_id: app.get('client_id'),
      client_secret: app.get('client_secret'),
      mfa_token: mfa_token,
      code: code,
      challenge_type: 'totp',
      redirect_uri: 'urn:ietf:wg:oauth:2.0:oob',
    }).then(({ data: token }) => {
      dispatch(authLoggedIn(token));
      return token;
    });
  };
}

export function verifyCredentials(token) {
  return (dispatch, getState) => {
    dispatch({ type: VERIFY_CREDENTIALS_REQUEST });

    return baseClient(token).get('/api/v1/accounts/verify_credentials').then(({ data: account }) => {
      dispatch(importFetchedAccount(account));
      dispatch({ type: VERIFY_CREDENTIALS_SUCCESS, token, account });
      if (account.id === getState().get('me')) dispatch(fetchMeSuccess(account));
      return account;
    }).catch(error => {
      if (getState().get('me') === null) dispatch(fetchMeFail(error));
      dispatch({ type: VERIFY_CREDENTIALS_FAIL, token, error });
    });
  };
}

export function logIn(intl, username, password) {
  return (dispatch, getState) => {
    return dispatch(createAppAndToken()).then(() => {
      return dispatch(createUserToken(username, password));
    }).catch(error => {
      if (error.response.data.error === 'mfa_required') {
        throw error;
      } else if(error.response.data.error) {
        dispatch(snackbar.error(error.response.data.error));
      } else {
        dispatch(snackbar.error(intl.formatMessage(messages.invalidCredentials)));
      }
      throw error;
    });
  };
}

export function logOut(intl) {
  return (dispatch, getState) => {
    const state = getState();
    const account = getLoggedInAccount(state);

    const params = {
      client_id: state.getIn(['auth', 'app', 'client_id']),
      client_secret: state.getIn(['auth', 'app', 'client_secret']),
      token: state.getIn(['auth', 'users', account.get('url'), 'access_token']),
    };

    return dispatch(revokeOAuthToken(params)).finally(() => {
      dispatch({ type: AUTH_LOGGED_OUT, account });
      dispatch(snackbar.success(intl.formatMessage(messages.loggedOut)));
    });
  };
}

export function switchAccount(accountId, background = false) {
  return (dispatch, getState) => {
    const account = getState().getIn(['accounts', accountId]);
    dispatch({ type: SWITCH_ACCOUNT, account, background });
  };
}

export function fetchOwnAccounts() {
  return (dispatch, getState) => {
    const state = getState();
    state.getIn(['auth', 'users']).forEach(user => {
      const account = state.getIn(['accounts', user.get('id')]);
      if (!account) {
        dispatch(verifyCredentials(user.get('access_token')));
      }
    });
  };
}

export function register(params) {
  return (dispatch, getState) => {
    params.fullname = params.username;

    return dispatch(createAppAndToken()).then(() => {
      return dispatch(createAccount(params));
    }).then(({ token }) => {
      dispatch(authLoggedIn(token));
      return token;
    });
  };
}

export function fetchCaptcha() {
  return (dispatch, getState) => {
    return api(getState).get('/api/pleroma/captcha');
  };
}

export function resetPassword(nickNameOrEmail) {
  return (dispatch, getState) => {
    dispatch({ type: RESET_PASSWORD_REQUEST });
    const params =
      nickNameOrEmail.includes('@')
        ? { email: nickNameOrEmail }
        : { nickname: nickNameOrEmail };
    return api(getState).post('/auth/password', params).then(() => {
      dispatch({ type: RESET_PASSWORD_SUCCESS });
    }).catch(error => {
      dispatch({ type: RESET_PASSWORD_FAIL, error });
      throw error;
    });
  };
}

export function changeEmail(email, password) {
  return (dispatch, getState) => {
    dispatch({ type: CHANGE_EMAIL_REQUEST, email });
    return api(getState).post('/api/pleroma/change_email', {
      email,
      password,
    }).then(response => {
      if (response.data.error) throw response.data.error; // This endpoint returns HTTP 200 even on failure
      dispatch({ type: CHANGE_EMAIL_SUCCESS, email, response });
    }).catch(error => {
      dispatch({ type: CHANGE_EMAIL_FAIL, email, error, skipAlert: true });
      throw error;
    });
  };
}

export function deleteAccount(intl, password) {
  return (dispatch, getState) => {
    const account = getLoggedInAccount(getState());

    dispatch({ type: DELETE_ACCOUNT_REQUEST });
    return api(getState).post('/api/pleroma/delete_account', {
      password,
    }).then(response => {
      if (response.data.error) throw response.data.error; // This endpoint returns HTTP 200 even on failure
      dispatch({ type: DELETE_ACCOUNT_SUCCESS, response });
      dispatch({ type: AUTH_LOGGED_OUT, account });
      dispatch(snackbar.success(intl.formatMessage(messages.loggedOut)));
    }).catch(error => {
      dispatch({ type: DELETE_ACCOUNT_FAIL, error, skipAlert: true });
      throw error;
    });
  };
}

export function changePassword(oldPassword, newPassword, confirmation) {
  return (dispatch, getState) => {
    dispatch({ type: CHANGE_PASSWORD_REQUEST });
    return api(getState).post('/api/pleroma/change_password', {
      password: oldPassword,
      new_password: newPassword,
      new_password_confirmation: confirmation,
    }).then(response => {
      if (response.data.error) throw response.data.error; // This endpoint returns HTTP 200 even on failure
      dispatch({ type: CHANGE_PASSWORD_SUCCESS, response });
    }).catch(error => {
      dispatch({ type: CHANGE_PASSWORD_FAIL, error, skipAlert: true });
      throw error;
    });
  };
}

export function authLoggedIn(token) {
  return {
    type: AUTH_LOGGED_IN,
    token,
  };
}