const fastify = require('fastify')({ logger: true })
const fs = require('fs');
const path = require('path')
var LdapAuth = require('ldapauth-fork');

var prankPath = "prankdata.txt";
if (!fs.existsSync(prankPath)) {
    fs.writeFileSync(prankPath, "{}");
}

var activityPath = "activitydata.txt";
if (!fs.existsSync(activityPath)) {
    fs.writeFileSync(activityPath, "{}");
}

let PrankData = JSON.parse(fs.readFileSync(prankPath));
let ActivityData = JSON.parse(fs.readFileSync(activityPath));
let AdminUsersUid = ["asyncnomi", "johan", "enthalpine", "fas", "arina", "billy", "remi", "pierre", "matmaz", "", "", ""];
let UsersToken = {};
let TokenDurationSecond = 3600;
let MaxAmountCrepe = 10;
let Supplements = ["nature", "sucre", "nutella", "confiture"];

var ldapConf = JSON.parse(fs.readFileSync("ldap-conf.json"));
var LDAP = new LdapAuth({
    url: 'ldap://10.5.0.44',
    bindDN: 'cn='+ ldapConf.bindUser +',ou=service-users,dc=ldap,dc=rezo-rm,dc=fr',
    bindCredentials: ldapConf.bindPassword,
    searchBase: 'dc=ldap,dc=rezo-rm,dc=fr',
    searchFilter: '(uid={{username}})',
    reconnect: true,
});
LDAP.on('error', function (err) {
  console.error('LdapAuth: ', err);
});
ldapConf = null;

fastify.addContentTypeParser('application/json', {
    parseAs: 'string'
}, function(req, body, done) {
    try {
        var json = JSON.parse(body)
        done(null, json)
    } catch (err) {
        err.statusCode = 400
        done(err, undefined)
    }
})

fastify.register(require('@fastify/static'), {
    root: path.join(__dirname, 'static'),
    decorateReply: false
})

fastify.get('/', async (request, reply) => {
    reply.redirect('/index.html')
})

fastify.post('/login', async (request, reply) => {
    let content = request.body;
    if (content.hasOwnProperty("user")
    && content.hasOwnProperty("password")) {
        let res = await authenticate(content.user, content.password);
        if (res.authState) {
            let now = new Date();
            UsersToken[res.authUser.uid] = {
                token: makeid(64),
                expire: now.setSeconds(now.getSeconds() + TokenDurationSecond)
            }
            return {
                success: true,
                user: {
                    uid: res.authUser.uid,
                    givenName: res.authUser.givenName
                },
                token: UsersToken[res.authUser.uid].token
            }
        } else {
            return {
                success: false,
                why: "Wrong username or password"
            }
        }
    } else {
        return {
            success: false,
            why: "The username or password is missing"
        }
    }
})

fastify.post('/addPrank', async (request, reply) => {
    let content = request.body;
    let auth = checkAuthetification(content);
    if (auth.success) {
        if ("type" in content) {
            let prankUid = makeid(16);
            if ("prankUid" in content) {
                let prankExists = checkPrank(content)
                if (prankExists.success) {
                    if (PrankData[prankUid].state != "Pending") {
                        return {
                            success: false,
                            why: "You cannot edit already accepted prank request"
                        }
                    } else {
                        prankUid = content.prankUid;
                    }
                } else {
                    return prankExists;
                }
            }
            let note = ("note" in content) ? content.note : "N/A";
            switch (content.type) {
                case "crêpe":
                    if ("where" in content
                    && "amount" in content
                    && "supplement" in content) {
                        let amount = parseInt(content.amount)
                        if (!isNaN(amount)) {
                            if (!Supplements.contains(content.supplement)) {
                                if (amount < MaxAmountCrepe) {
                                    let prankUid = makeid(16);
                                    PrankData[prankUid] = {
                                        creator: content.uid,
                                        type: content.type,
                                        where: content.where,
                                        amount: amount,
                                        supplement: content.supplement,
                                        note: content.note,
                                        state: "Pending",
                                        manageBy: null
                                    }
                                    saveData(prankPath, PrankData);
                                    return {
                                        sucess: true,
                                        uid: prankUid,
                                        prank: PrankData[prankUid]
                                    }
                                } else {
                                    return {
                                        success: false,
                                        why: "Too much"
                                    }
                                }
                            } else {
                                return {
                                    success: false,
                                    why: "This supplement isn't available"
                                }
                            }
                        } else {
                            return {
                                success: false,
                                why: "Unable to parse the amount as integer"
                            }
                        }
                    } else {
                        return {
                            success: false,
                            why: "Missing amount, where or supplement"
                        }
                    }
                    break;
                case "kidnap":
                    if ("targetUid" in content
                    && "when" in content) {
                        let prankUid = makeid(16);
                        PrankData[prankUid] = {
                            creator: content.uid,
                            type: content.type,
                            targetUid: content.targetUid,
                            when: content.when,
                            note: content.note,
                            state: "Pending",
                            manageBy: null
                        }
                        saveData(prankPath, PrankData);
                        return {
                            sucess: true,
                            uid: prankUid,
                            prank: PrankData[prankUid]
                        }
                    } else {
                        return {
                            success: false,
                            why: "Missing amount or where"
                        }
                    }
                    break;
                default:
                    return {
                        success: false,
                        why: "Unknow type"
                    }
            }
        } else {
            return {
                success: false,
                why: "Missing type"
            }
        }
    } else {
        return auth
    }
})

fastify.post('/delPrank', async (request, reply) => {
    let content = request.body;
    let auth = checkAuthetification(content);
    if (auth.success) {
        let prankExists = checkPrank(content)
        if (prankExists.success) {
            if (PrankData[content.prankUid].creator === content.uid) {
                delete PrankData[content.prankUid];
                return {
                    success: true,
                }
            } else {
                return {
                    success: false,
                    why: "Not allowed"
                }
            }
        } else {
            return prankExists
        }
    } else {
        return auth
    }
})

fastify.post('/acceptPrank', async (request, reply) => {
    let content = request.body;
    let prankExists = checkManagePrank(content)
    if (prankExists.success) {
        PrankData[content.prankUid].state = "Accepted";
        PrankData[content.prankUid].manageBy = content.uid;
        return {
            success: true,
        }
    } else {
        return prankExists
    }
})

fastify.post('/donePrank', async (request, reply) => {
    let content = request.body;
    let prankExists = checkManagePrank(content)
    if (prankExists.success) {
        if (PrankData[content.prankUid].manageBy == content.uid) {
            PrankData[content.prankUid].state = "Done";
            return {
                success: true,
            }
        } else {
            return {
                success: false,
                why: "Not allowed"
            }
        }
    } else {
        return prankExists
    }
})

fastify.post('/refusePrank', async (request, reply) => {
    let content = request.body;
    let prankExists = checkManagePrank(content)
    if (prankExists.success) {
        PrankData[content.prankUid].state = "Refused";
        PrankData[content.prankUid].manageBy = content.uid;
        return {
            success: true,
        }
    } else {
        return prankExists
    }
})

fastify.post('/get', async (request, reply) => {
    let content = request.body;
    let auth = checkAuthetification(content);
    if (auth.success) {
        if ("type" in content) {
            switch (content.type) {
                case "prank":
                    if (AdminUsersUid.includes(content.uid)) {
                        return {
                            sucess: true,
                            prankData: PrankData
                        }
                    } else {
                        return {
                            success: false,
                            why: "Not Allowed"
                        }
                    }
                    break;
                case "activity":
                    return {
                        sucess: true,
                        prankData: ActivityData
                    }
                    break;
                default:
                    return {
                        success: false,
                        why: "Unknown type"
                    }
            }
        } else {
            return {
                success: false,
                why: "Missing type"
            }
        }
    } else {
        return auth
    }
})

fastify.post('/addActivity', async (request, reply) => {
    let content = request.body;
    let auth = checkAuthetification(content);
    if (auth.success) {
        if (AdminUsersUid.includes(content.uid)) {
            if ("title" in content
            && "desc" in content
            && "start" in content
            && "end" in content
            && "where" in content) {
                let activityUid = makeid(16);
                if ("activityUid" in content) {
                    let activityExists = checkActivity(content)
                    if (activityExists.success) {
                        activityUid = content.activityUid;
                    } else {
                        return activityExists;
                    }
                }
                ActivityData[activityUid] = {
                    title: content.title,
                    desc: content.desc,
                    start: content.start,
                    end: content.end,
                    where: content.where
                }
                saveData(activityPath, ActivityData);
                return {
                    sucess: true,
                    uid: activityUid,
                    activity: ActivityData[activityUid]
                }
            } else {
                return {
                    success: false,
                    why: "Missing title, desc, start, end or where"
                }
            }
        } else {
            return {
                success: false,
                why: "Not Allowed"
            }
        }
    }
})

fastify.post('/delActivity', async (request, reply) => {
    let content = request.body;
    let auth = checkAuthetification(content);
    if (auth.success) {
        if (AdminUsersUid.includes(content.uid)) {
            let activityExists = checkActivity(content)
            if (activityExists.success) {
                delete ActivityData[content.activityUid]
            } else {
                return activityExists
            }
        } else {
            return {
                success: false,
                why: "Not allowed"
            }
        }
    } else {
        return auth
    }
})


function saveData(path, data) {
  fs.writeFileSync(path, JSON.stringify(data));
}

function authenticate(user, pwd) {
    return new Promise((resolve, reject) => {
        LDAP.authenticate(user, pwd, function(err, user) {
            if (user && err == null) {
                resolve({
                    authState: true,
                    authUser: user
                });
            } else {
                resolve({
                    authState: false,
                    authUser: null
                });
            }
        });
    })
}

function checkAuthetification(content) {
    if (content.hasOwnProperty("uid")
    && content.hasOwnProperty("token")) {
        if (UsersToken.hasOwnProperty(content.uid)
        && UsersToken[content.uid].token === content.token) {
            if (UsersToken[content.uid].expire > new Date()) {
                return {
                    success: true
                }
            } else {
                delete UsersToken[content.uid];
                return {
                    success: false,
                    why: "Token expired"
                }
            }
        } else {
            return {
                success: false,
                why: "Not authenticated"
            }
        }
    }
}

function checkPrank(content) {
    if ("prankUid" in content) {
        if (content.prankUid in PrankData) {
            return {
                success: true,
            }
        } else {
            return {
                success: false,
                why: "Unknow prankUid"
            }
        }
    } else {
        return {
            success: false,
            why: "Missing prankUid"
        }
    }
}

function checkActivity(content) {
    if ("activityUid" in content) {
        if (content.activityUid in ActivityData) {
            return {
                success: true,
            }
        } else {
            return {
                success: false,
                why: "Unknow activityUid"
            }
        }
    } else {
        return {
            success: false,
            why: "Missing activityUid"
        }
    }
}

function checkManagePrank(content) {
    let auth = checkAuthetification(content);
    if (auth.success) {
        if (AdminUsersUid.includes(content.uid)) {
            let prankExists = checkPrank(content)
            if (prankExists.success) {
                return {
                    success: true
                }
            } else {
                return prankExists
            }
        } else {
            return {
                success: false,
                why: "Not Allowed"
            }
        }
    } else {
        return auth
    }
}

function makeid(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

const start = async () => {
    try {
        await fastify.listen({ port: 3000 , host: '127.0.0.1',})
    } catch (err) {
        fastify.log.error(err)
        LDAP.close(function(err) {
            console.log(err);
        })
        process.exit(1)
    }
}
start()