const uuid = require('uuid').v4
const { Model } = require('flitter-orm')
const { NodeDescriptorType } = require('../../enum')

class Node extends Model {
    static get services() {
        return [...super.services, 'models']
    }

    static get schema() {
        return {
            uuid: { type: String, default: uuid },
            pied_name: String,
            pied_parent_path: { type: String, default: '/' },
            overlay_name: { type: String, default: 'mainline' },
            mtime: { type: Date, default: () => new Date },
            atime: { type: Date, default: () => new Date },
            ctime: { type: Date, default: () => new Date },
            mode: { type: Number, default: 33188 },
            size: { type: Number, default: 0 },

            descriptor_type: { type: String, default: NodeDescriptorType.File },
            uploaded_file_id: String,

            deleted: { type: Boolean, default: false },
            root: { type: Boolean, default: false },
        }
    }

    static path_parts(path) {
        const path_parts = path.split('/')
        const pied_name = path_parts.pop()
        let pied_parent_path = path_parts.join('/')
        if ( !pied_parent_path.startsWith('/') ) pied_parent_path = `/${pied_parent_path}`

        return [pied_parent_path, pied_name]
    }

    static async get_root() {
        let root = await this.findOne({
            deleted: false, root: true, pied_parent_path: '/', pied_name: '/',
        })

        if ( !root ) {
            root = new this({
                pied_name: '/',
                mode: 16877,
                root: true,
                descriptor_type: NodeDescriptorType.Directory,
            })

            await root.save()
        }

        return root
    }

    static async get_path(path, workspace = 'mainline') {
        const [pied_parent_path, pied_name] = this.path_parts(path)

        const nodes = await this.find({
            pied_name,
            pied_parent_path,
            overlay_name: {
                $in: [workspace, 'mainline'],
            },
            deleted: false,
            root: false,
        })

        if ( nodes.length === 1 ) {
            return nodes[0]
        }

        if ( nodes.length === 2 ) {
            return nodes.find(x => x.overlay_name === workspace)
        }
    }

    static async list_path(path, workspace = 'mainline') {
        const nodes = await this.find({
            pied_parent_path: path,
            overlay_name: workspace,
            // deleted: false,
            root: false,
        })

        const mainline_nodes = await this.find({
            pied_name: {
                $nin: nodes.map(x => x.pied_name),
            },
            pied_parent_path: path,
            overlay_name: 'mainline',
            deleted: false,
            root: false,
        })

        return [...nodes, ...mainline_nodes].filter(x => !x.deleted)
    }

    async uploaded_file() {
        if ( !this.uploaded_file_id ) return;

        const File = this.models.get('upload::File')
        return File.findById(this.uploaded_file_id)
    }

    async all_descendants(workspace = 'mainline') {
        const formatted_parent = `${this.pied_parent_path === '/' ? '/' : this.pied_parent_path + '/'}${this.pied_name}`
        const nodes = await this.constructor.find({
            pied_parent_path: {
                $regex: this.root ? `/.*` : `(?:${formatted_parent}/.*)|(?:${formatted_parent}$)`,
            },
            overlay_name: workspace,
            root: false,
            // deleted: false,
        })

        const mainline_nodes = await this.constructor.find({
            $and: [
                {
                    pied_parent_path: {
                        $regex: this.root ? `/.*` : `(?:${formatted_parent}/.*)|(?:${formatted_parent}$)`,
                    },
                    overlay_name: 'mainline',
                    root: false,
                    deleted: false,
                },
                ...nodes.map(node => {
                    return {
                        pied_parent_path: {
                            $ne: node.pied_parent_path,
                        },
                        pied_name: {
                            $ne: node.pied_name,
                        },
                    }
                })
            ],
        })

        return [...nodes, ...mainline_nodes].filter(x => !x.deleted)
    }

    to_api() {
        return {
            pied_name: this.pied_name,
            mtime: this.mtime,
            atime: this.atime,
            ctime: this.ctime,
            mode: this.mode,
            nlink: 1,
            uid: 0,  // TODO
            gid: 0,  // TODO
            size: this.size,
        }
    }
}

module.exports = exports = Node