Vue.use(VueMaterial.default);

const getLoginMessageFromError = (json) => {
    switch (json.message) {
        case 'ERROR_REQUEST_LOGIN_INVALID': {
            return 'Invalid username or password.';
        }

        case 'ERROR_ACCESS_DENIED': {
            return 'You are not allowed to perform this action.'
        }

        default: {
            return 'Unknown error. Something went wrong.'
        }
    }
}

const getSignupMessageFromError = (json) => {
    switch (json.message) {
        case 'ERROR_REQUEST_INVALID_DATA': {

            switch (json.errors[0].param) {
                case 'username': {
                    return 'Invalid username. Username must be between 3 and 32 characters long, and be alphanumeric.';
                }
                case 'password': {
                    return 'Invalid password. Password must be at least 8 characters long and at most 128 characters.';
                }
                case 'email': {
                    return 'Invalid email.';
                }

                default: {
                    return 'Invalid value sent to server. Something went wrong.';
                }
            }

        }

        case 'ERROR_ACCESS_DENIED': {
            return 'You are not allowed to perform this action.'
        }

        case 'ERROR_REQUEST_USERNAME_EXISTS': {
            return 'That username is taken.';
        }

        default: {
            return 'Unknown error. Something went wrong.'
        }
    }
};

const app = new Vue({
    el: '#app',
    data: {
        usernameInput: '',
        emailInput: '',
        passwordInput: '',
        mode: 'SIGNUP',
        showSnackbarNotification: false,
        snackbarNotification: '',
        snackbarNotificationDuration: 999999,
        snackbarButtonText: 'Ok',
        successfulLogin: false,
        loggedInUser: {}
    },
    mounted: async function() {
        const res = await fetch(`${window.location.origin}/api/v1/users/current/info`, {
            method: 'GET',
            headers: {
                'Accept': 'application/json',
            },
            credentials: 'include'
        });

        if (res.status === 200) {
            const json = await res.json();
            if (json.user.permissionLevel >= 1) {
                this.loggedInUser = json.user;
                this.mode = 'MANAGE';
            } else {
                this.resetSnackbarButton();
                this.notification('Your account has been suspended');
                this.successfulLogin = true;
            }
        } else {
            this.mode = 'SIGNUP';
        }
    },
    computed: {
        modeName: function() {
            switch (this.mode) {
                case 'SIGNUP': {
                    return 'Sign up';
                }
                case 'LOGIN': {
                    return 'Log in';
                }
                case 'LOADING': {
                    return 'Loading...';
                }
                case 'MANAGE': {
                    return this.loggedInUser.username || 'Unknown account';
                }
                case 'NONE': {
                    return '';
                }
                default: {
                    return 'Something went wrong.';
                }
            }
        }
    },
    methods: {
        snackbarButtonAction: function() {
            this.showSnackbarNotification = false;
        },
        snackbarButtonClick: function() {
            this.snackbarButtonAction();
        },
        snackbarEditButton: function(buttonText="Ok", action) {
            this.snackbarButtonText = buttonText;
            this.snackbarButtonAction = action;
        },
        resetSnackbarButton: function() {
            this.snackbarButtonText = 'Ok';
            this.snackbarButtonAction = () => {
                this.showSnackbarNotification = false;
            };
        },
        notification: function(text) {
            this.snackbarNotification = text;
            this.showSnackbarNotification = true;
        },
        performTokenRemoval: async function() {
            const res = await fetch(`${window.location.origin}/api/v1/users/browser/token/clear`, {
                method: 'POST',
                credentials: 'include'
            });

            if (res.status === 200) {
                this.loggedInUser = {};
                this.snackbarEditButton('Home', () => {
                    window.location.href = `${window.location.origin}`;
                    this.resetSnackbarButton();
                    this.showSnackbarNotification = false;
                });
                this.successfulLogin = true;
                this.notification('Successfully logged out');
            } else {
                this.resetSnackbarButton();
                this.notification('Could not log out');
            }
        },
        navigateHome: function() {
            window.location.href = `${window.location.origin}`;
        },
        performTokenCreation: async function() {
            const res = await fetch(`${window.location.origin}/api/v1/users/token/create`, {
                method: 'POST',
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json'
                },
                credentials: 'include',
                body: JSON.stringify({
                    username: this.usernameInput,
                    password: this.passwordInput,
                    alsoSetCookie: true
                })
            });

            const json = await res.json();
            
            if (json.error || res.status !== 200) {
                this.resetSnackbarButton();
                this.notification(getLoginMessageFromError(json));
                return;
            } else {
                document.cookie = `token=${json.token}; HTTPOnly=true; max-age=10800`;
                this.successfulLogin = true;
                this.snackbarEditButton('Home', () => {
                    this.navigateHome();
                    this.resetSnackbarButton();
                    this.showSnackbarNotification = false;
                });
                this.notification(`Successfully logged into account "${json.user.username}"`);
                this.loggedInUser = { username: json.user.username, _id: json.user._id };
                return;
            }
        },
        performAccountCreation: async function() {
            const res = await fetch(`${window.location.origin}/api/v1/users/account/create`, {
                method: 'POST',
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    username: this.usernameInput,
                    email: this.emailInput,
                    password: this.passwordInput
                })
            });

            const json = await res.json();
            
            console.log(json);

            if (json.error || res.status !== 200) {
                this.resetSnackbarButton();
                this.notification(getSignupMessageFromError(json));
                return;
            } else {
                this.snackbarEditButton('Login', () => {
                    this.mode = 'LOGIN';
                    this.resetSnackbarButton();
                    this.showSnackbarNotification = false;
                });
                this.notification(`Account "${json.user.username}" successfully created`);
                return;
            }
        }
    }
});