const Controller = require('libflitter/controller/Controller')

/*
 * Menu Controller
 * -------------------------------------------------------------
 * Put some description here!
 */
class Menu extends Controller {
    static get services() {
        return [...super.services, 'models']
    }

    async get_items(req, res) {
        const Page = this.models.get('api:Page')

        // Build the "My Tree" option
        const root_page = await req.user.get_root_page()
        const nodes = await this._build_menu_object(root_page)
        const menu = []

        menu.push({
            id: 0,
            name: 'My Info Tree',
            children: nodes,
            noDelete: true,
            virtual: true,
            type: 'branch',
        })

        // Get view only shared trees
        const view_only_trees = await Page.find({ shared_users_view: req.user._id })
        const view_only_nodes = []
        for ( const tree of view_only_trees ) {
            if ( !(await tree.is_accessible_by(req.user)) ) continue
            view_only_nodes.push({
                id: tree.UUID,
                name: tree.Name,
                children: await this._build_secure_menu_object(tree, req.user),
                level: await tree.access_level_for(req.user),
                type: 'page',
            })
        }

        // Get update, view shared trees
        const update_trees = await Page.find({ shared_users_update: req.user._id })
        const update_nodes = []
        for ( const tree of update_trees ) {
            if ( !(await tree.is_accessible_by(req.user)) ) continue
            update_nodes.push({
                id: tree.UUID,
                name: tree.Name,
                children: await this._build_secure_menu_object(tree, req.user),
                level: await tree.access_level_for(req.user),
                type: 'page',
            })
        }

        // Get update, view, manage shared trees
        const manage_trees = await Page.find({ shared_users_manage: req.user._id })
        const manage_nodes = []
        for ( const tree of manage_trees ) {
            if ( !(await tree.is_accessible_by(req.user)) ) continue
            manage_nodes.push({
                id: tree.UUID,
                name: tree.Name,
                children: await this._build_secure_menu_object(tree, req.user),
                level: await tree.access_level_for(req.user),
                type: 'page',
            })
        }

        menu.push({
            id: 0,
            name: 'Trees Shared With Me',
            children: [...view_only_nodes, ...update_nodes, ...manage_nodes],
            noDelete: true,
            noChildren: true,
            virtual: true,
            type: 'branch',
        })

        return res.api(menu)
    }

    async _build_menu_object(parent_node, arr= []) {
        const children = await this.models.get('api:Page').find({UUID: {$in: parent_node.ChildPageIds}})
        if ( children ) {
            for ( const child of children ) {
                arr.push({
                    id: child.UUID,
                    name: child.is_shared() ? child.Name + ' ⁽ˢʰᵃʳᵉᵈ⁾' : child.Name,
                    shared: child.is_shared(),
                    children: [...(await child.get_menu_items()), ...(await this._build_menu_object(child))],
                    type: 'page',
                })
            }
        }

        return arr
    }

    async _build_secure_menu_object(parent_node, user, arr = []) {
        const children = await parent_node.childPages
        if ( children ) {
            for ( const child of children ) {
                if ( !(await child.is_accessible_by(user)) ) continue
                arr.push({
                    id: child.UUID,
                    name: child.Name,
                    children: await this._build_secure_menu_object(child, user),
                    level: await child.access_level_for(user),
                    type: 'page',
                })
            }
        }
        return arr
    }

}

module.exports = exports = Menu