const Controller = require('libflitter/controller/Controller')
const Page = require('../../../models/api/Page.model')
const Node = require('../../../models/api/Node.model')
const Database = require('../../../models/api/db/Database.model')
const ColumnDef = require('../../../models/api/db/ColumnDef.model')
const DBEntry = require('../../../models/api/db/DBEntry.model')

/*
 * Database Controller
 * -------------------------------------------------------------
 * Put some description here!
 */
class FormDatabase extends Controller {

    async create_new(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const db = new Database({
            Name: req.body.name ? req.body.name : 'New Database',
            NodeId: node.UUID,
            PageId: page.UUID,
        })

        await db.save()

        req.user.allow(`database:${db.UUID}`);
        await req.user.save()

        return res.api(db)
    }

    async get_config(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user) ) return req.security.deny()

        return res.api(db)
    }

    async get_columns(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user) ) return req.security.deny()

        const columns = await ColumnDef.find({ DatabaseId: db.UUID })
        return res.api(columns)
    }

    async set_columns(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user, 'update') ) return req.security.deny()

        const existing_columns = await ColumnDef.find({ DatabaseId: db.UUID })
        const assoc_columns = []
        existing_columns.forEach(col => assoc_columns[col.UUID] = col)

        const update_columns = []
        for ( const col of req.body.columns ) {
            if ( col.UUID && assoc_columns[col.UUID] ) {
                assoc_columns[col.UUID].headerName = col.headerName
                assoc_columns[col.UUID].field = col.field
                assoc_columns[col.UUID].DatabaseId = db.UUID
                assoc_columns[col.UUID].Type = col.Type
                await assoc_columns[col.UUID].save()
                update_columns.push(assoc_columns[col.UUID])
            } else {
                const new_col = new ColumnDef({
                    headerName: col.headerName,
                    field: col.field,
                    DatabaseId: db.UUID,
                    Type: col.Type,
                })

                await new_col.save()
                update_columns.push(new_col)
            }
        }

        for ( const col of existing_columns ) {
            if ( !update_columns.includes(col) ) {
                await col.delete()
            }
        }

        return res.api(update_columns)
    }

    async get_data(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user) ) return req.security.deny()

        const entries = await DBEntry.find({DatabaseId: db.UUID})
        entries.forEach(entry => entry.RowData.UUID = entry.UUID)

        return res.api(entries)
    }

    async set_data(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user) ) return req.security.deny()

        await DBEntry.deleteMany({DatabaseId: db.UUID})

        const new_recs = []
        for ( const rec of req.body ) {
            const data = {DatabaseId: db.UUID}
            if ( rec.UUID ) data.UUID = rec.UUID
            delete rec.UUID
            data.RowData = rec

            const dbe = new DBEntry(data)
            await dbe.save()
            dbe.RowData.UUID = dbe.UUID
            new_recs.push(dbe)
        }
        return res.api(new_recs)
    }

    async drop_database(req, res) {
        const PageId = req.params.PageId

        let page = await Page.findOne({UUID: PageId})
        if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
        if ( !page.accessible_by(req.user) ) return req.security.deny()

        const NodeId = req.params.NodeId

        let node = await Node.findOne({UUID: NodeId})
        if ( !node ) return res.status(404).message('Node not found with that ID.').api({})

        const DatabaseId = req.params.DatabaseId
        const db = await Database.findOne({UUID: DatabaseId})
        if ( !db ) return res.status(404).message('Database not found with that ID.').api({})
        if ( !db.accessible_by(req.user) ) return req.security.deny()

        await DBEntry.deleteMany({DatabaseId: db.UUID})
        await db.delete()
        return res.api({})
    }

}

module.exports = exports = FormDatabase