/**
 * This router handles things related to the web browser experience...
 */
// This is the mock data we working with...

module.exports = function (options) {
    const config = require('config');
    var QRCode = require('qrcode');
    var express = options.express;
    
    const db = options.db;
    const hdAuthUtil = options.hdAuthUtil;

    var router = express.Router();

    router.route('/')
        .get(function(request, response, next) {
            response.render("home", {
                user: request.user,
                pageTitle: "HDAuth - Account"
            })
        });

    router.route('/authenticate')
        .get(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                response.render("login-displayName", {
                    user: request.user,
                    pageTitle: "HDAuth - Login"
                })
            } 
        })
        .post(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                db.User.findOne({
                    where: {
                        displayName: request.body.displayName
                    },
                    include: [
                        {
                            association: db.User.ExtendedPublicKeys,
                            required: true
                        }
                    ]
                }).then(user => {
                    if(user) {
                        // TODO: Support multiple login options...
                        const loginMessage = {
                            action: "authenticate",
                            url: config.get("server.domain"),
                            userIdentifier: user.displayName,
                        }
                        const challenge = hdAuthUtil.createChallenge(
                            user.extendedPublicKeys[0].xpub,
                            JSON.stringify(loginMessage) // TODO: Create a login body...
                        )
                        QRCode.toDataURL(JSON.stringify(challenge), function (err, url) {
                            if(err) {
                                console.error(err);
                            }
                            response.render("xpub-login", {
                                // challenge user to sign thier xpub
                                challenge: challenge,
                                qrCode: url,
                                user: request.user
                            })
                        })
                    } else {
                        // User doesn't exist register account
                        response.render("login-signup", {
                            user: request.user,
                            displayName: request.body.displayName,
                            pageTitle: "HD Auth - Signup",
                        });
                    }
                    
                }).catch(error => {
                    console.error("Failed to fulfill account/authenticate post", request.body);
                    console.error("Reason: ", error);

                    response.render("error", {
                        message: "This site didn't have the time for error handling."
                    })
                })
            }
        });

    router.route('/authenticate/response')
        .post(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                // Verify challenge
                if(hdAuthUtil.verifyHDAuthChallengeResponse(request.body)) {
                    // user passed challenge...
                    var loginMessage = JSON.parse(request.body.message);
                    db.User.findOne({
                        where: {
                            displayName: loginMessage.userIdentifier,
                        },
                        include: [
                            {
                                association: db.User.ExtendedPublicKeys
                            }
                        ]
                    }).then(user => {
                        if(user) {
                            // User created we can authenticate them on the site...
                            request.logIn(user, function(err) {
                                if (err) { return next(err); }
                                return response.redirect('/');
                            });
                        } else {
                            console.error("Authenticated user doesn't exist: ", loginMessage);
                        }
                    }).catch(error => {
                        console.error("Failed to create authenticated user");
                        console.error("Error: ", error);
                        next(error);
                    })
                } else {
                    // user failed challenge
                    console.error("User failed to authenticate");
                    // Create new challenge and try again...
                    return response.redirect('/authenticate');
                }
            } 
        })

    router.route('/register')
        .get(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                response.render("account-registration", {
                    user: request.user,
                    newUser: {},
                    pageTitle: "HDAuth - Registration"
                })
            } 
        })

    router.route('/register/xpub')
        .post(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                db.User.build({
                    displayName: request.body.displayName,
                    extendedPublicKeys: [
                        {
                            xpub: request.body.xpub
                        }
                    ]
                }, {
                    include: [
                        {
                            association: db.User.ExtendedPublicKeys
                        }
                    ]
                }).validate()
                .then(xpubUser => {
                    if (xpubUser) {
                        // Challenge
                        const registerationMessage = {
                            action: "register",
                            url: config.get("server.domain"),
                            userIdentifier: xpubUser.displayName, // identifier the user supplies on the login page
                            user: xpubUser,
                            serviceExtendedPublicKey: config.get("bip32.serviceAuthenticatingExtendedPublicKey")
                        }
                        const challenge = hdAuthUtil.createChallenge(
                            request.body.xpub, // update this to identifier...
                            JSON.stringify(registerationMessage)
                        )
                        QRCode.toDataURL(JSON.stringify(challenge), function (err, url) {
                            if(err) {
                                console.error(err);
                            }
                            response.render("xpub-account-registeration-challenge", {
                                xpubUser: xpubUser,
                                // challenge user to sign thier xpub
                                challenge: challenge,
                                qrCode: url,
                                user: request.user
                            })
                        })
                        
                    } else {
                        console.log("Empty User")
                        
                        // TODO: error handling..
                        response.render("error", {
                            user: request.user,
                            message: "VOID"
                        })
                    }
                }).catch(error => {
                    console.error("Failed to create user");
                    console.error("Reason: ", error);
                    
                    // TODO: error handling..
                    response.render("error", {
                        user: request.user,
                        message: "Failed to create user"
                    })
                })
            } 
        })

    router.route('/register/xpub/response')
        .post(function(request, response, next) {
            if(request.user) {
                response.redirect('/account');
            } else {
                // Verify challenge
                if(hdAuthUtil.verifyHDAuthChallengeResponse(request.body)) {
                    // user passed challenge...
                    // TODO: Load registration request from challenge.message
                    // TODO: build and validate that user owns xpub...
                    var xpubUser = JSON.parse(request.body.message).user;
                    // Possibility that username is taken...
                    // TODO: Create user without username
                    db.User.create(xpubUser, {
                        include: [
                            {
                                association: db.User.ExtendedPublicKeys
                            }
                        ]
                    }).then(user => {
                        if(user) {
                            // User created we can authenticate them on the site...
                            request.logIn(user, function(err) {
                                if (err) { return next(err); }
                                return response.redirect('/');
                              });
                        } 
                    }).catch(error => {
                        console.error("Failed to create authenticated user");
                        console.error("Error: ", error);
                        next(error);
                    })
                } else {
                    // user failed challenge
                    // TODO: Validate input
                    // TODO: Createa new challenge
                    console.error("User failed to authenticate");
                    // Create new challenge and try again...
                }
            } 
        })

    router.route('/logout')
        .post(function(request, response, next) {
            if(request.user) {
                request.logout();
                response.redirect('/');

                // db.Session.destroy({
                //     where: {
                //         sid: request.sessionID
                //     }
                // }).then(() => {
                //     console.log("")
                // }).catch(error => {
                //     next(error);
                //     console.error("Log out error: ", error);
                // })
            } else {
                // No user...
                response.redirect('/');
            }
        });

    // TODO: add other endpoints
    return router;
};