import { Utils } from './helpers/utils.js'
import { verifyPassword } from './helpers/pwd.js'
import { MySQLClient } from './helpers/mysqlClient.js'
export class P42ApiEndpoints{
    constructor(app, db) {
        this.db = new MySQLClient(db, 60)
        this.app = app
        this.userinfos = null
        this.utils = new Utils()
        this.registerPaths()
    }

    registerPaths(){
        this.app.get('/hw', this.hw.bind(this))
        this.app.get('/checkauth', this.checkauth.bind(this))
        this.app.post('/login', this.login.bind(this))
        this.app.get('/logout', this.logout.bind(this))
        
    }

    err(req, res, msg, debug, status=500) {
        if(!debug) debug = msg
        let jsonResp = {'success':false,
                        'payload': null,
                        'error': {
                            'displayMessage' : msg,
                            'debugMessage' : debug
                        } 
                    };
        res.set('Content-Type', 'application/json');
        res.status(status)
        res.send(JSON.stringify(jsonResp));
    }

    ok(req, res, payload) {
        let jsonResp = {    "success": true,
                            "payload": payload,
                        };
        res.set('Content-Type', 'application/json');
        res.send(JSON.stringify(jsonResp));
    }


    async makeSession(req, res) {
        req.session.userinfo =  req.body
        console.log('REQ body:', req.body)
        this.ok(req, res, {})
    }

    hasRole(roles) {
        if(!this.userinfos.userRoles) return(false)
        if(typeof(roles) == 'string') return(this.userinfos.userRoles.includes(roles))
        else if(Array.isArray(roles)) {
            for(let role of roles) {
                if(this.userinfos.userRoles.includes(role)) return(true)
            }
        }
        return(false)
    }

///////////////////////////API starts here.../////////////////////////////
    async hw(req, res) {
        this.ok(req, res, {hello:'world'})
    }

    async checkauth(req, res) {
        if(req.session.userInfos && req.session.authenticated && req.session.userInfos && req.session.userInfos.identity && req.session.userInfos.identity.username) {
            this.ok(req, res, {
                authenticated: true,
                userInfos: req.session.userInfos,
                trials: 3,
                locked: false,
            })
        } else {
            let trials = 3
            let locked = false
            if(req.session.userInfos && req.session.userInfos.identity && req.session.userInfos.identity.username) {
                const results = await this.db.execute('SELECT usr_trials, usr_locked FROM users WHERE usr_name = ?', [req.session.userInfos.username])
                if(results.length==1){
                    trials = results[0].usr_trials
                    locked = results[0].usr_locked
                }
            }
            this.ok(req, res, {
                authenticated: false,
                userInfos: null,
                trials: trials,
                locked: locked,
            })
        }

    }

    async setUserLock(username, locked, trials){
        await this.db.execute('UPDATE users SET usr_locked=?, usr_trials=? WHERE usr_name = ?', [locked, trials, username])
    }

    async login(req, res) {
        let [isValid, payload, errors] = this.utils.validateMapObject(req.body, {
            username: ((val, obj) => (typeof(val)=='string') && (val.length>0) && (/^\w+$/.test(val))),
            passwd: ((val, obj) => (typeof(val)=='string') && (val.length>0) ),
        },{ 
            'username': 'username',
            'passwd': 'passwd',
        })
        
        if((!isValid)){
            this.err(req, res, `Invalid request`, `Invalid login payload:: ${errors}`, 401)
            return
        }

        const results = await this.db.execute('SELECT * FROM users WHERE usr_name = ?', [payload.username])
        let pwdCheck = false
        let userLocked = false
        let trials = 3
        if(results.length==1){
            userLocked = results[0].usr_locked
            trials = results[0].usr_trials
            if(userLocked) {
                this.ok(req, res, {
                    authenticated: false,
                    userInfos: null,
                    trials: 0,
                    locked: true,
                })
                return
            }
        }
        
        if(results.length>0) pwdCheck = await verifyPassword(payload.passwd, results[0].usr_pwd) 
        if(pwdCheck){
            req.session.userInfos = {
                identity:{
                    username: payload.username,
                    uuid: results[0].usr_uuid,
                },
                roles: ['admin'],
            }
            req.session.authenticated = true

            await this.setUserLock(payload.username, false, 3)
            this.ok(req, res, {
                authenticated: true,
                userInfos: req.session.userInfos,
                trials: 3,
                locked: false,
            })
        } else {
            let newtrials = (trials>0) ? trials-1 : 0
            if(newtrials == 0){
                await this.setUserLock(payload.username, true, 0)
                this.ok(req, res, {
                    authenticated: false,
                    userInfos: null,
                    trials: 0,
                    locked: true,
                })
                return            
            } else {
                await this.setUserLock(payload.username, false, newtrials)
            }

            req.session.authenticated = false
            req.session.userInfos = null
            this.ok(req, res, {
                authenticated: false,
                userInfos: null,
                trials: newtrials,
                locked: false,
            })            
        }
    }
    
    async logout(req, res) {
        if(req.session.userInfos && req.session.authenticated) {
            req.session.authenticated = false
            this.ok(req, res, {
                authenticated: false,
                userInfos: null,
                trials: 3,
                locked: false,
            })
        } 

    }
}