'use strict';

exports = module.exports = {
    getProvider,
    attachInteractionRoutes
};

const assert = require('assert'),
    debug = require('debug')('box:oidc'),
    fs = require('fs'),
    path = require('path'),
    paths = require('./paths.js'),
    BoxError = require('./boxerror.js'),
    HttpError = require('connect-lastmile').HttpError,
    HttpSuccess = require('connect-lastmile').HttpSuccess,
    users = require('./users.js'),
    safe = require('safetydance'),
    settings = require('./settings.js');

class CloudronAdapter {

  /**
   *
   * Creates an instance of MyAdapter for an oidc-provider model.
   *
   * @constructor
   * @param {string} name Name of the oidc-provider model. One of "Grant, "Session", "AccessToken",
   * "AuthorizationCode", "RefreshToken", "ClientCredentials", "Client", "InitialAccessToken",
   * "RegistrationAccessToken", "DeviceCode", "Interaction", "ReplayDetection",
   * "BackchannelAuthenticationRequest", or "PushedAuthorizationRequest"
   *
   */
    constructor(name) {
        this.name = name;
        this.fileStorePath = path.join(paths.PLATFORM_DATA_DIR, `oidc-${name}.json`);

        debug(`Creating adapter for ${name} backed by ${this.fileStorePath}`);

        let data = {};
        try {
            data = JSON.parse(fs.readFileSync(this.fileStorePath), 'utf8');
        } catch (e) {
            debug(`filestore for adapter ${name} not found, start with new one`);
        }

        this.store = data;
    }

  /**
   *
   * Update or Create an instance of an oidc-provider model.
   *
   * @return {Promise} Promise fulfilled when the operation succeeded. Rejected with error when
   * encountered.
   * @param {string} id Identifier that oidc-provider will use to reference this model instance for
   * future operations.
   * @param {object} payload Object with all properties intended for storage.
   * @param {integer} expiresIn Number of seconds intended for this model to be stored.
   *
   */
    async upsert(id, payload, expiresIn) {
        debug(`[${this.name}] upsert id:${id} expiresIn:${expiresIn}`, payload);

        this.store[id] = { id, expiresIn, payload, consumed: false };
        fs.writeFileSync(this.fileStorePath, JSON.stringify(this.store), 'utf8');
    }

  /**
   *
   * Return previously stored instance of an oidc-provider model.
   *
   * @return {Promise} Promise fulfilled with what was previously stored for the id (when found and
   * not dropped yet due to expiration) or falsy value when not found anymore. Rejected with error
   * when encountered.
   * @param {string} id Identifier of oidc-provider model
   *
   */
    async find(id) {
        debug(`[${this.name}] find id:${id}`);

        if (!this.store[id]) return false;

        return this.store[id].payload;
    }

  /**
   *
   * Return previously stored instance of DeviceCode by the end-user entered user code. You only
   * need this method for the deviceFlow feature
   *
   * @return {Promise} Promise fulfilled with the stored device code object (when found and not
   * dropped yet due to expiration) or falsy value when not found anymore. Rejected with error
   * when encountered.
   * @param {string} userCode the user_code value associated with a DeviceCode instance
   *
   */
    async findByUserCode(userCode) {
        debug(`[${this.name}] FIXME findByUserCode userCode:${userCode}`);
    }

  /**
   *
   * Return previously stored instance of Session by its uid reference property.
   *
   * @return {Promise} Promise fulfilled with the stored session object (when found and not
   * dropped yet due to expiration) or falsy value when not found anymore. Rejected with error
   * when encountered.
   * @param {string} uid the uid value associated with a Session instance
   *
   */
    async findByUid(uid) {
        debug(`[${this.name}] findByUid uid:${uid}`);

        for (let d in this.store) {
            if (this.store[d].payload.uid === uid) return this.store[d].payload;
        }

        return false;
    }

  /**
   *
   * Mark a stored oidc-provider model as consumed (not yet expired though!). Future finds for this
   * id should be fulfilled with an object containing additional property named "consumed" with a
   * truthy value (timestamp, date, boolean, etc).
   *
   * @return {Promise} Promise fulfilled when the operation succeeded. Rejected with error when
   * encountered.
   * @param {string} id Identifier of oidc-provider model
   *
   */
    async consume(id) {
        debug(`[${this.name}] consume id:${id}`);

        if (this.store[id]) this.store[id].consumed = true;
    }

  /**
   *
   * Destroy/Drop/Remove a stored oidc-provider model. Future finds for this id should be fulfilled
   * with falsy values.
   *
   * @return {Promise} Promise fulfilled when the operation succeeded. Rejected with error when
   * encountered.
   * @param {string} id Identifier of oidc-provider model
   *
   */
    async destroy(id) {
        debug(`[${this.name}] destroy id:${id}`);

        delete this.store[id];
    }

  /**
   *
   * Destroy/Drop/Remove a stored oidc-provider model by its grantId property reference. Future
   * finds for all tokens having this grantId value should be fulfilled with falsy values.
   *
   * @return {Promise} Promise fulfilled when the operation succeeded. Rejected with error when
   * encountered.
   * @param {string} grantId the grantId value associated with a this model's instance
   *
   */
    async revokeByGrantId(grantId) {
        debug(`[${this.name}] revokeByGrantId grantId:${grantId}`);

        for (let d in this.store) {
            if (this.store[d].grantId === grantId) {
                delete this.store[d];
                return;
            }
        }
    }
}

const store = new Map();
const logins = new Map();

class Account {
  constructor(id, profile) {
    this.accountId = id || 'FIXME_someid';
    this.profile = profile;
    store.set(this.accountId, this);
  }

  /**
   * @param use - can either be "id_token" or "userinfo", depending on
   *   where the specific claims are intended to be put in.
   * @param scope - the intended scope, while oidc-provider will mask
   *   claims depending on the scope automatically you might want to skip
   *   loading some claims from external resources etc. based on this detail
   *   or not return them in id tokens but only userinfo and so on.
   */
  async claims(use, scope) { // eslint-disable-line no-unused-vars
    if (this.profile) {
      return {
        sub: this.accountId, // it is essential to always return a sub claim
        email: this.profile.email,
        email_verified: this.profile.email_verified,
        family_name: this.profile.family_name,
        given_name: this.profile.given_name,
        locale: this.profile.locale,
        name: this.profile.name,
      };
    }

    return {
      sub: this.accountId, // it is essential to always return a sub claim

      address: {
        country: '000',
        formatted: '000',
        locality: '000',
        postal_code: '000',
        region: '000',
        street_address: '000',
      },
      birthdate: '1987-10-16',
      email: 'johndoe@example.com',
      email_verified: false,
      family_name: 'Doe',
      gender: 'male',
      given_name: 'John',
      locale: 'en-US',
      middle_name: 'Middle',
      name: 'John Doe',
      nickname: 'Johny',
      phone_number: '+49 000 000000',
      phone_number_verified: false,
      picture: 'http://lorempixel.com/400/200/',
      preferred_username: 'johnny',
      profile: 'https://johnswebsite.com',
      updated_at: 1454704946,
      website: 'http://example.com',
      zoneinfo: 'Europe/Berlin',
    };
  }

  static async findByFederated(provider, claims) {
    const id = `${provider}.${claims.sub}`;
    if (!logins.get(id)) {
      logins.set(id, new Account(id, claims));
    }
    return logins.get(id);
  }

  static async findByLogin(login) {
    if (!logins.get(login)) {
      logins.set(login, new Account(login));
    }

    return logins.get(login);
  }

  static async findAccount(ctx, id, token) { // eslint-disable-line no-unused-vars
    // token is a reference to the token used for which a given account is being loaded,
    //   it is undefined in scenarios where account claims are returned from authorization endpoint
    // ctx is the koa request context
    if (!store.get(id)) new Account(id); // eslint-disable-line no-new
    return store.get(id);
  }
}

function attachInteractionRoutes(routePrefix, app, provider) {
    assert.strictEqual(typeof routePrefix, 'string');
    assert.strictEqual(typeof app, 'function'); // express app
    assert.strictEqual(typeof provider, 'object');

    function setNoCache(req, res, next) {
        res.set('cache-control', 'no-store');
        next();
    }

    app.get(routePrefix + '/interaction/:uid', setNoCache, async (req, res, next) => {
        try {
            const { uid, prompt, params, session } = await provider.interactionDetails(req, res);
            console.log('details', await provider.interactionDetails(req, res));

            debug(`route interaction get uid:${uid} prompt.name:${prompt.name} client_id:${params.client_id} session:${session}`);

            const client = await provider.Client.find(params.client_id);

            switch (prompt.name) {
                case 'login': {
                    return res.render('login', {
                        client,
                        submitUrl: `${routePrefix}/interaction/${uid}/login`,
                        uid,
                        details: prompt.details,
                        params,
                        title: 'Sign-in',
                        session: session ? debug(session) : undefined,
                        dbg: {
                            params: debug(params),
                            prompt: debug(prompt),
                        },
                    });
                }
                case 'consent': {
                    return res.render('interaction', {
                        client,
                        submitUrl: `${routePrefix}/interaction/${uid}/confirm`,
                        uid,
                        details: prompt.details,
                        params,
                        title: 'Authorize',
                        session: session ? debug(session) : undefined,
                        dbg: {
                            params: debug(params),
                            prompt: debug(prompt),
                        },
                    });
                }
                default:
                    return undefined;
            }
        } catch (err) {
            return next(err);
        }
    });

    app.post(routePrefix + '/interaction/:uid/login', setNoCache, async (req, res, next) => {
        const [detailsError, details] = await safe(provider.interactionDetails(req, res));
        if (detailsError) return next(new HttpError(500, detailsError));

        const uid = details.uid;
        const prompt = details.prompt;
        const name = prompt.name;

        debug(`route interaction login post uid:${uid} prompt.name:${name}`, req.body);

        assert.equal(name, 'login');

        if (!req.body.username || typeof req.body.username !== 'string') return next(new HttpError(400, 'A username must be non-empty string'));
        if (!req.body.password || typeof req.body.password !== 'string') return next(new HttpError(400, 'A password must be non-empty string'));
        if ('totpToken' in req.body && typeof req.body.totpToken !== 'string') return next(new HttpError(400, 'totpToken must be a string' ));

        const { username, password, totpToken } = req.body;

        const verifyFunc = username.indexOf('@') === -1 ? users.verifyWithUsername : users.verifyWithEmail;

        const [verifyError, user] =  await safe(verifyFunc(username, password, users.AP_WEBADMIN, { totpToken }));
        if (verifyError && verifyError.reason === BoxError.INVALID_CREDENTIALS) return next(new HttpError(401, verifyError.message));
        if (verifyError && verifyError.reason === BoxError.NOT_FOUND) return next(new HttpError(401, 'Unauthorized'));
        if (verifyError) return next(new HttpError(500, verifyError));
        if (!user) return next(new HttpError(401, 'Unauthorized'));

        // TODO we may have to check what else the Account class provides, in which case we have to map those things
        const result = {
            login: {
                accountId: user.id,
            },
        };

        const [interactionFinishError, interaction] = await safe(provider.interactionFinished(req, res, result));
        if (interactionFinishError) return next(new HttpError(500, interactionFinishError));

        next(new HttpSuccess(200, { redirectTo: interaction.redirectTo }));
    });

    app.post(routePrefix + '/interaction/:uid/confirm', setNoCache, async (req, res, next) => {
        try {
            const interactionDetails = await provider.interactionDetails(req, res);
            const { uid, prompt: { name, details }, params, session: { accountId } } = interactionDetails;

            debug(`route interaction confirm post uid:${uid} prompt.name:${name} accountId:${accountId}`);

            assert.equal(name, 'consent');

            let { grantId } = interactionDetails;
            let grant;

            if (grantId) {
                // we'll be modifying existing grant in existing session
                grant = await provider.Grant.find(grantId);
            } else {
                // we're establishing a new grant
                grant = new provider.Grant({
                    accountId,
                    clientId: params.client_id,
                });
            }

            if (details.missingOIDCScope) {
                grant.addOIDCScope(details.missingOIDCScope.join(' '));
            }
            if (details.missingOIDCClaims) {
                grant.addOIDCClaims(details.missingOIDCClaims);
            }
            if (details.missingResourceScopes) {
                // eslint-disable-next-line no-restricted-syntax
                for (const [indicator, scopes] of Object.entries(details.missingResourceScopes)) {
                    grant.addResourceScope(indicator, scopes.join(' '));
                }
            }

            grantId = await grant.save();

            const consent = {};
            if (!interactionDetails.grantId) {
                // we don't have to pass grantId to consent, we're just modifying existing one
                consent.grantId = grantId;
            }

            const result = { consent };
            await provider.interactionFinished(req, res, result, { mergeWithLastSubmission: true });
        } catch (err) {
            next(err);
        }
    });

    app.get(routePrefix + '/interaction/:uid/abort', setNoCache, async (req, res, next) => {
        debug(`route interaction abort`);

        try {
            const result = {
                error: 'access_denied',
                error_description: 'End-User aborted interaction',
            };
            await provider.interactionFinished(req, res, result, { mergeWithLastSubmission: false });
        } catch (err) {
            next(err);
        }
    });
}

async function getProvider(routePrefix) {
    assert.strictEqual(typeof routePrefix, 'string');

    const { Provider } = await import('oidc-provider');

    const configuration = {
        // use the one from Account class I guess?
        async findAccount(ctx, id) {
            debug(`findAccount ctx:${ctx} id:${id}`);

            return {
                accountId: id,
                async claims(use, scope) { return { sub: id }; },
            };
        },
        adapter: CloudronAdapter,
        interactions: {
            url: async function(ctx, interaction) {
                return `${routePrefix}/interaction/${interaction.uid}`;
            }
        },
        features: {
            devInteractions: { enabled: false }
        },
        clients: [{
            client_id: 'foo',
            client_secret: 'bar',
            redirect_uris: ['https://openidconnect.net/callback'],
        }],
        pkce: {
            required: function pkceRequired(ctx, client) {
                return false;
            }
        }
    };

    const provider = new Provider(`https://${settings.dashboardFqdn()}`, configuration);
    provider.proxy = true

    return provider;
}