Vue.use(VueMaterial.default);

const getCreatePostError = (json) => {
    switch (json.message) {
        case 'ERROR_REQUEST_INVALID_DATA': {
            switch (json.errors[0].param) {
                case 'title': {
                    return 'Invalid title. Must be between 3 and 32 characters.';
                }
                case 'body': {
                    return 'Invalid content. Must be between 3 and 1000 characters';
                }
                case 'category': {
                    return 'Invalid category. Something went wrong.';
                }
                default: {
                    return 'Invalid value sent to server. Something went wrong.';
                }
            }
        }

        case 'ERROR_CATEGORY_NOT_FOUND': {
            return 'The category you tried to post to no longer exists.';
        }

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

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

const getCreateCategoryError = (json) => {
    switch (json.message) {
        case 'ERROR_REQUEST_INVALID_DATA': {
            switch (json.errors[0].param) {
                case 'title': {
                    return 'Invalid title. Title must be between 3 and 32 characters.';
                }
            }
        }

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

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

class GatewayConnection {
    constructor() {
        this.isConnected = false;
        this.socket = null;
    }
}

GatewayConnection.prototype.connect = function(token) {
    console.log('[*] [gateway] [handshake] Trying to connect to gateway');
    this.socket = io('/gateway', {
        query: {
            token
        },
        transports: ['websocket']
    });

    this.socket.on('hello', () => {
        console.log('[*] [gateway] [handshake] Got hello from server, sending yoo...');
        this.socket.emit('yoo');
    });

    this.socket.on('error', (e) => {
        console.log('[E] [gateway] Gateway error', e);
        this.isConnected = false;
    });
    this.socket.on('disconnectNotification', (e) => {
        console.log('[E] [gateway] Received disconnect notfication', e);
        this.isConnected = false;
    });
    this.socket.on('disconnect', (e) => {
        console.log('[E] [gateway] Disconnected from gateway: ', e);
        this.isConnected = false;
    });
};

const app = new Vue({
    el: '#app',
    data: {
        showSnackbarNotification: false,
        snackbarNotification: '',
        snackbarNotificationDuration: 999999,
        snackbarButtonText: 'Ok',
        loggedInUser: {},
        showApp: false,
        menuVisible: false,
        selection: {
            category: {
                title: '',
                browsing: false,
                _id: undefined,
                isCategory: false
            },
            posts: []
        },
        cardButtons: [],
        dialog: {
            show: {
                createPost: false,
                createCategory: false
            },
            text: {
                createPost: {
                    title: '',
                    body: ''
                },
                createCategory: {
                    title: ''
                }
            }
        },
        viewingProfile: {
            show: false,
            _id: '',
            username: '',
            role: ''
        },
        gateway: new GatewayConnection()
    },
    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.showApp = true;
                this.performGatewayConnection();
                this.browseCategories();
            } else {
                this.showApp = false;
                this.snackbarEditButton('Manage', () => {
                    window.location.href = `${window.location.origin}/auth.html`;
                    this.resetSnackbarButton();
                    this.showSnackbarNotification = false;
                });
                this.notification('Your account does not have the required permissions to enter this page');
            }
        } else {
            this.showApp = false;
            this.snackbarEditButton('Manage', () => {
                window.location.href = `${window.location.origin}/auth.html`;
                this.resetSnackbarButton();
                this.showSnackbarNotification = false;
            });
            this.notification('You are not logged in or your session is invalid');
        }
    },
    methods: {
        navigateToAccountManager() {
            window.location.href = `${window.location.origin}/auth.html`;
        },
        snackbarButtonAction: function() {
            this.showSnackbarNotification = false;
        },
        snackbarButtonClick: function() {
            this.snackbarButtonAction();
        },
        snackbarEditButton: function(buttonText="Ok", action) {
            this.snackbarButtonText = buttonText;
            this.snackbarButtonAction = action;
        },
        resetSnackbarButton: function() {
            this.snackbarButtonText = 'Ok';
            this.snackbarButtonAction = () => {
                this.showSnackbarNotification = false;
            };
        },
        notification: function(text) {
            this.snackbarNotification = text;
            this.showSnackbarNotification = true;
        },
        performGatewayConnection: function() {
            // TODO: again, the thing im doing with the token is not very secure, since its being sent by the current user info endpoint and is also being send through query parameters
            this.gateway.connect(this.loggedInUser.token);
        },
        button: function(text, click) {
            this.cardButtons.push({ text, click });
        },
        refresh: function() {
            if (this.selection.category.title === 'categories' && this.selection.category.isCategory === false) {
                this.browseCategories();
            } else {
                this.browse(this.selection.category);
            }
        },
        viewProfile: async function(id) {
            // TODO: this just returns the username for now
            const res = await fetch(`${window.location.origin}/api/v1/users/user/${id}/info`, {
                method: 'GET',
                headers: {
                    'Accept': 'application/json',
                },
                credentials: 'include'
            });

            if (res.status === 200) {
                const json = await res.json();
                this.viewingProfile.username = json.user.username;
                this.viewingProfile._id = json.user._id;
                this.viewingProfile.role = json.user.role;
                this.viewingProfile.show = true;
            } else {
                this.resetSnackbarButton();
                this.notification('Failed to fetch user data');
            }
        },
        stopBrowsing: function() {
            this.selection.category = {
                title: '',
                browsing: false,
                _id: undefined,
                isCategory: false
            };
            this.selection.posts = [];
            this.cardButtons = [];
        },
        showCreatePostDialog: function() {
            if (!this.selection.category.isCategory) {
                this.resetSnackbarButton();
                this.notification('You are not in a category');
                return;
            }

            this.dialog.show.createPost = true;
        },
        createPost: async function() {
            if (!this.selection.category.isCategory) {
                this.resetSnackbarButton();
                this.notification('You are not in a category');
                return;
            }

            const category = this.selection.category;
            const input = this.dialog.text.createPost;

            const res = await fetch(`${window.location.origin}/api/v1/content/post/create`, {
                method: 'POST',
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json'
                },
                credentials: 'include',
                body: JSON.stringify({
                    category: category._id,
                    title: input.title,
                    body: input.body
                })
            });

            if (res.status !== 200) {
                if (res.status === 401 || res.status === 403) {
                    this.resetSnackbarButton();
                    this.notification('You are not allowed to do that');
                    return;
                }
                if (res.status === 429) {
                    this.resetSnackbarButton();
                    this.notification('Chill! You are posting too much!');
                    return;
                }

                const json = await res.json();
                this.resetSnackbarButton();
                this.notification(getCreatePostError(json));
                return;
            } else {
                this.resetSnackbarButton();
                this.notification('Successfully created post');
                this.dialog.show.createPost = false;
                this.browse(this.selection.category);
                return;
            }
        },
        createCategory: async function() {
            const input = this.dialog.text.createCategory;

            const res = await fetch(`${window.location.origin}/api/v1/content/category/create`, {
                method: 'POST',
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json'
                },
                credentials: 'include',
                body: JSON.stringify({
                    title: input.title
                })
            });

            if (res.status !== 200) {
                if (res.status === 401 || res.status === 403) {
                    this.resetSnackbarButton();
                    this.notification('You are not allowed to do that');
                    return;
                }
                if (res.status === 429) {
                    this.resetSnackbarButton();
                    this.notification('Chill! You are posting too much!');
                    return;
                }

                const json = await res.json();
                this.resetSnackbarButton();
                this.notification(getCreateCategoryError(json));
                return;
            } else {
                this.resetSnackbarButton();
                this.notification('Successfully created category');
                this.dialog.show.createCategory = false;
                this.browseCategories();
                return;
            }
        },
        browse: async function(category) {
            const { _id, title } = category;

            const res = await fetch(`${window.location.origin}/api/v1/content/category/${_id}/info`, {
                method: 'GET',
                headers: {
                    'Accept': 'application/json',
                },
                credentials: 'include'
            });

            if (res.status === 200) {
                const json = await res.json();

                this.selection.category.title = title;
                this.selection.category._id = _id;
                this.selection.category.browsing = true;
                this.selection.category.isCategory = true;
                this.selection.posts = [];

                this.cardButtons = [];

                for (let i = 0; i < json.category.posts.length; i++) {
                    const v = json.category.posts[i];
                    this.selection.posts.push({ title: v.title, body: v.body, _id: v._id, creator: v.creator });
                }
            } else {
                this.resetSnackbarButton();
                this.notification('Failed to fetch category');
            }
        },
        openChatForCategory: async function(categoryId) {

        },
        browseCategories: async function() {
            const res = await fetch(`${window.location.origin}/api/v1/content/category/list?count=50`, {
                method: 'GET',
                headers: {
                    'Accept': 'application/json',
                },
                credentials: 'include'
            });

            if (res.status === 200) {
                const json = await res.json();

                this.selection.category.title = 'categories';
                this.selection.category.browsing = true;
                this.selection.category.isCategory = false;
                this.selection.posts = [];

                this.cardButtons = [];

                this.button('Chat', (post) => {
                    this.browse(post);
                });
                this.button('View', (post) => {
                    this.browse(post);
                });

                for (let i = 0; i < json.categories.length; i++) {
                    const v = json.categories[i];
                    this.selection.posts.push({ title: v.title, body: '', _id: v._id, creator: v.creator });
                }
            } else {
                this.resetSnackbarButton();
                this.notification('Failed to fetch category list');
            }
        }
    }
});