/*global $STM_Config */
import koa_router from 'koa-router';
import koa_body from 'koa-body';
import models from 'db/models';
import findUser from 'db/utils/find_user';
import config from 'config';
import recordWebEvent from 'server/record_web_event';
import {esc, escAttrs} from 'db/models';
import {emailRegex, getRemoteIp, rateLimitReq, checkCSRF} from 'server/utils/misc';
import coBody from 'co-body';
import Mixpanel from 'mixpanel';
import Tarantool from 'db/tarantool';
import {PublicKey, Signature, hash} from 'steem/lib/auth/ecc';
import {api, broadcast} from 'steem';
import {validate_account_name} from 'app/utils/ChainValidation';

const mixpanel = config.get('mixpanel') ? Mixpanel.init(config.get('mixpanel')) : null;

const _stringval = (v) => typeof v === 'string' ? v : JSON.stringify(v)
function logRequest(path, ctx, extra) {
    let d = {ip: getRemoteIp(ctx.req)}
    if (ctx.session) {
        if (ctx.session.user) {
            d.user = ctx.session.user
        }
        if (ctx.session.uid) {
            d.uid = ctx.session.uid
        }
        if (ctx.session.a) {
            d.account = ctx.session.a
        }
    }
    if (extra) {
        Object.keys(extra).forEach((k) => {
            const nk = d[k] ? '_'+k : k
            d[nk] = extra[k]
        })
    }
    const info = Object.keys(d).map((k) => `${ k }=${ _stringval(d[k]) }`).join(' ')
    console.log(`-- /${ path } --> ${ info }`)
}

export default function useGeneralApi(app) {
    const router = koa_router({prefix: '/api/v1'});
    app.use(router.routes());
    const koaBody = koa_body();

    router.post('/accounts_wait', koaBody, function *() {
        if (rateLimitReq(this, this.req)) return;
        const params = this.request.body;
        const account = typeof(params) === 'string' ? JSON.parse(params) : params;
        const remote_ip = getRemoteIp(this.req);
        if (!checkCSRF(this, account.csrf)) return;
        logRequest('accounts_wait', this, {account});
        const user_id = this.session.user;
        try {
            models.Account.create(escAttrs({
                user_id,
                name: account.name,
                owner_key: account.owner_key,
                active_key: account.active_key,
                posting_key: account.posting_key,
                memo_key: account.memo_key,
                remote_ip,
                referrer: this.session.r,
                created: false
            })).catch(error => {
                console.error('!!! Can\'t create account wait model in /accounts api', this.session.uid, error);
        });
            if (mixpanel) {
                mixpanel.track('Signup WaitList', {
                    distinct_id: this.session.uid,
                    ip: remote_ip
                });
                mixpanel.people.set(this.session.uid, {ip: remote_ip});
            }
        } catch (error) {
            console.error('Error in /accounts_wait', error);
        }
        this.body = JSON.stringify({status: 'ok'});
        recordWebEvent(this, 'api/accounts_wait', account ? account.name : 'n/a');
    });

    router.post('/accounts', koaBody, function *() {
        if (rateLimitReq(this, this.req)) return;
        const params = this.request.body;
        const account = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, account.csrf)) return;
        logRequest('accounts', this, {account})
        if ($STM_Config.disable_signups) {
            this.body = JSON.stringify({error: 'New signups are temporary disabled.'});
            this.status = 401;
            return;
        }

        const name_error = validate_account_name(account.name)
        if (name_error) {
            this.body = JSON.stringify({error: name_error});
            this.status = 500;
            return;
        }

        const user_id = this.session.user;
        if (!user_id) { // require user to sign in with identity provider
            this.body = JSON.stringify({error: 'Unauthorized'});
            this.status = 401;
            return;
        }

        // acquire global lock so only one account can be created at a time
        try {
            const lock_entity_res = yield Tarantool.instance().call('lock_entity', user_id+'');
            if (!lock_entity_res[0][0]) {
                console.log('-- /accounts lock_entity -->', user_id, lock_entity_res[0][0]);
                this.body = JSON.stringify({error: 'Conflict'});
                this.status = 409;
                return;
            }
        } catch (e) {
            console.error('-- /accounts tarantool is not available, fallback to another method', e)
            const rnd_wait_time = Math.random() * 10000;
            console.log('-- /accounts rnd_wait_time -->', rnd_wait_time);
            yield new Promise((resolve) =>
                setTimeout(() => resolve(), rnd_wait_time)
            )
        }

        try {
            const user = yield models.User.findOne(
                {attributes: ['id'], where: {id: user_id, account_status: 'approved'}}
            );
            if (!user) {
                throw new Error("We can't find your sign up request. You either haven't started your sign up application or weren't approved yet.");
            }

            // disable session/multi account for now

            // const existing_created_account = yield models.Account.findOne({
            //     attributes: ['id'],
            //     where: {user_id, ignored: false, created: true},
            //     order: 'id DESC'
            // });
            // if (existing_created_account) {
            //     throw new Error("Only one Steem account per user is allowed in order to prevent abuse");
            // }

            const remote_ip = getRemoteIp(this.req);
            // rate limit account creation to one per IP every 10 minutes
            const same_ip_account = yield models.Account.findOne(
                {attributes: ['created_at'], where: {remote_ip: esc(remote_ip), created: true}, order: 'id DESC'}
            );
            if (same_ip_account) {
                const minutes = (Date.now() - same_ip_account.created_at) / 60000;
                if (minutes < 10) {
                    console.log(`api /accounts: IP rate limit for user ${this.session.uid} #${user_id}, IP ${remote_ip}`);
                    throw new Error('Only one Steem account allowed per IP address every 10 minutes');
                }
            }

            yield createAccount({
                signingKey: config.get('registrar.signing_key'),
                fee: config.get('registrar.fee'),
                creator: config.get('registrar.account'),
                new_account_name: account.name,
                delegation: config.get('registrar.delegation'),
                owner: account.owner_key,
                active: account.active_key,
                posting: account.posting_key,
                memo: account.memo_key
            });
            console.log('-- create_account_with_keys created -->', this.session.uid, account.name, user.id, account.owner_key);

            this.body = JSON.stringify({status: 'ok'});

            // update user account status
            yield user.update({account_status: 'created'});

            // update or create account record
            const account_attrs = escAttrs({
                user_id,
                name: account.name,
                owner_key: account.owner_key,
                active_key: account.active_key,
                posting_key: account.posting_key,
                memo_key: account.memo_key,
                remote_ip,
                referrer: this.session.r,
                created: true
            });

            const existing_account = yield models.Account.findOne({
                attributes: ['id'],
                where: {user_id, name: account.name},
                order: 'id DESC'
            });
            if (existing_account) {
                yield existing_account.update(account_attrs);
            } else {
                yield models.Account.create(account_attrs);
            }
            if (mixpanel) {
                mixpanel.track('Signup', {
                    distinct_id: this.session.uid,
                    ip: remote_ip
                });
                mixpanel.people.set(this.session.uid, {ip: remote_ip});
            }
        } catch (error) {
            console.error('Error in /accounts api call', this.session.uid, error.toString());
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        } finally {
            // console.log('-- /accounts unlock_entity -->', user_id);
            // release global lock
            try { yield Tarantool.instance().call('unlock_entity', user_id + ''); } catch(e) {/* ram lock */}
        }
        recordWebEvent(this, 'api/accounts', account ? account.name : 'n/a');
    });

    router.post('/update_email', koaBody, function *() {
        if (rateLimitReq(this, this.req)) return;
        const params = this.request.body;
        const {csrf, email} = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, csrf)) return;
        logRequest('update_email', this, {email});
        try {
            if (!emailRegex.test(email.toLowerCase())) throw new Error('not valid email: ' + email);
            // TODO: limit by 1/min/ip
            let user = yield findUser({user_id: this.session.user, email: esc(email), uid: this.session.uid});
            if (user) {
                user = yield models.User.update({email: esc(email), waiting_list: true}, {where: {id: user.id}});
            } else {
                user = yield models.User.create({email: esc(email), waiting_list: true});
            }
            this.session.user = user.id;
            this.body = JSON.stringify({status: 'ok'});
        } catch (error) {
            console.error('Error in /update_email api call', this.session.uid, error);
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        }
        recordWebEvent(this, 'api/update_email', email);
    });

    router.post('/login_account', koaBody, function *() {
        if (rateLimitReq(this, this.req)) return;
        const params = this.request.body;
        const {csrf, account, signatures} = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, csrf)) return;
        logRequest('login_account', this, {account});
        try {
            const db_account = yield models.Account.findOne(
                {attributes: ['user_id'], where: {name: esc(account)}, logging: false}
            );
            if (db_account) this.session.user = db_account.user_id;

            if(signatures) {
                if(!this.session.login_challenge) {
                    console.error('/login_account missing this.session.login_challenge');
                } else {
                    const [chainAccount] = yield api.getAccountsAsync([account])
                    if(!chainAccount) {
                        console.error('/login_account missing blockchain account', account);
                    } else {
                        const auth = {posting: false}
                        const bufSha = hash.sha256(JSON.stringify({token: this.session.login_challenge}, null, 0))
                        const verify = (type, sigHex, pubkey, weight, weight_threshold) => {
                            if(!sigHex) return
                            if(weight !== 1 || weight_threshold !== 1) {
                                console.error(`/login_account login_challenge unsupported ${type} auth configuration: ${account}`);
                            } else {
                                const sig = parseSig(sigHex)
                                const public_key = PublicKey.fromString(pubkey)
                                const verified = sig.verifyHash(bufSha, public_key)
                                if (!verified) {
                                    console.error('/login_account verification failed', this.session.uid, account, pubkey)
                                }
                                auth[type] = verified
                            }
                        }
                        const {posting: {key_auths: [[posting_pubkey, weight]], weight_threshold}} = chainAccount
                        verify('posting', signatures.posting, posting_pubkey, weight, weight_threshold)
                        if (auth.posting) this.session.a = account;
                    }
                }
            }

            this.body = JSON.stringify({status: 'ok'});
            const remote_ip = getRemoteIp(this.req);
            if (mixpanel) {
                mixpanel.people.set(this.session.uid, {ip: remote_ip, $ip: remote_ip});
                mixpanel.people.increment(this.session.uid, 'Logins', 1);
            }
        } catch (error) {
            console.error('Error in /login_account api call', this.session.uid, error.message);
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        }
        recordWebEvent(this, 'api/login_account', account);
    });

    router.post('/logout_account', koaBody, function *() {
        // if (rateLimitReq(this, this.req)) return; - logout maybe immediately followed with login_attempt event
        const params = this.request.body;
        const {csrf} = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, csrf)) return;
        logRequest('logout_account', this);
        try {
            this.session.a = null;
            this.body = JSON.stringify({status: 'ok'});
        } catch (error) {
            console.error('Error in /logout_account api call', this.session.uid, error);
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        }
    });

    router.post('/record_event', koaBody, function *() {
        if (rateLimitReq(this, this.req)) return;
        try {
            const params = this.request.body;
            const {csrf, type, value} = typeof(params) === 'string' ? JSON.parse(params) : params;
            if (!checkCSRF(this, csrf)) return;
            logRequest('record_event', this, {type, value});
            const str_value = typeof value === 'string' ? value : JSON.stringify(value);
            if (type.match(/^[A-Z]/)) {
                if (mixpanel) {
                    mixpanel.track(type, {distinct_id: this.session.uid, Page: str_value});
                    mixpanel.people.increment(this.session.uid, type, 1);
                }
            } else {
                recordWebEvent(this, type, str_value);
            }
            this.body = JSON.stringify({status: 'ok'});
        } catch (error) {
            console.error('Error in /record_event api call', error.message);
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        }
    });

    router.post('/csp_violation', function *() {
        if (rateLimitReq(this, this.req)) return;
        let params;
        try {
            params = yield coBody(this);
        } catch (error) {
            console.log('-- /csp_violation error -->', error);
        }
        if (params && params['csp-report']) {
            const csp_report = params['csp-report'];
            const value = `${csp_report['document-uri']} : ${csp_report['blocked-uri']}`;
            console.log('-- /csp_violation -->', value, '--', this.req.headers['user-agent']);
            recordWebEvent(this, 'csp_violation', value);
        } else {
            console.log('-- /csp_violation [no csp-report] -->', params, '--', this.req.headers['user-agent']);
        }
        this.body = '';
    });

    router.post('/page_view', koaBody, function *() {
        const params = this.request.body;
        const {csrf, page, ref} = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, csrf)) return;
        if (page.match(/\/feed$/)) {
            this.body = JSON.stringify({views: 0});
            return;
        }
        const remote_ip = getRemoteIp(this.req);
        logRequest('page_view', this, {page});
        try {
            let views = 1, unique = true;
            if (config.has('tarantool') && config.has('tarantool.host')) {
                try {
                    const res = yield Tarantool.instance().call('page_view', page, remote_ip, this.session.uid, ref);
                    unique = res[0][0];
                } catch (e) {}
            }
            const page_model = yield models.Page.findOne(
                {attributes: ['id', 'views'], where: {permlink: esc(page)}, logging: false}
            );
            if (unique) {
                if (page_model) {
                    views = page_model.views + 1;
                    yield yield models.Page.update({views}, {where: {id: page_model.id}, logging: false});
                } else {
                    yield models.Page.create(escAttrs({permlink: page, views}), {logging: false});
                }
            } else {
                if (page_model) views = page_model.views;
            }
            this.body = JSON.stringify({views});
            if (mixpanel) {
                let referring_domain = '';
                if (ref) {
                    const matches = ref.match(/^https?\:\/\/([^\/?#]+)(?:[\/?#]|$)/i);
                    referring_domain = matches && matches[1];
                }
                const mp_params = {
                    distinct_id: this.session.uid,
                    Page: page,
                    ip: remote_ip,
                    $referrer: ref,
                    $referring_domain: referring_domain
                };
                mixpanel.track('PageView', mp_params);
                if (!this.session.mp) {
                    mixpanel.track('FirstVisit', mp_params);
                    this.session.mp = 1;
                }
                if (ref) mixpanel.people.set_once(this.session.uid, '$referrer', ref);
                mixpanel.people.set_once(this.session.uid, 'FirstPage', page);
                mixpanel.people.increment(this.session.uid, 'PageView', 1);
            }
        } catch (error) {
            console.error('Error in /page_view api call', this.session.uid, error.message);
            this.body = JSON.stringify({error: error.message});
            this.status = 500;
        }
    });

    router.post('/save_cords', koaBody, function *() {
        const params = this.request.body;
        const {csrf, x, y} = typeof(params) === 'string' ? JSON.parse(params) : params;
        if (!checkCSRF(this, csrf)) return;
        const user = yield models.User.findOne({
            where: { id: this.session.user }
        });
        if (user) {
            let data = user.sign_up_meta ? JSON.parse(user.sign_up_meta) : {};
            data["button_screen_x"] = x;
            data["button_screen_y"] = y;
            data["last_step"] = 3;
            try {
                user.update({
                    sign_up_meta: JSON.stringify(data)
                });
            } catch (error) {
                console.error('Error in /save_cords api call', this.session.uid, error.message);
                this.body = JSON.stringify({error: error.message});
                this.status = 500;
            }
        }
        this.body = JSON.stringify({status: 'ok'});
    });
}

/**
 @arg signingKey {string|PrivateKey} - WIF or PrivateKey object
 */
function* createAccount({
    signingKey, fee, creator, new_account_name, json_metadata = '', delegation,
    owner, active, posting, memo
}) {
    const operations = [['account_create_with_delegation', {
        fee, creator, new_account_name, json_metadata, delegation,
        owner: {weight_threshold: 1, account_auths: [], key_auths: [[owner, 1]]},
        active: {weight_threshold: 1, account_auths: [], key_auths: [[active, 1]]},
        posting: {weight_threshold: 1, account_auths: [], key_auths: [[posting, 1]]},
        memo_key: memo,
    }]]
    yield broadcast.sendAsync({
        extensions: [],
        operations
    }, [signingKey])
}

const parseSig = hexSig => {try {return Signature.fromHex(hexSig)} catch(e) {return null}}
