/* Interface for MongoDB

Gemeinsam genutzt von readin (Live-API) und readarchive (CSV-Archiv).
Zusammengefuehrt aus den beiden zuvor getrennten Fassungen; wo sie sich
unterschieden, gilt:
  - MONGOAUTH wird als String verglichen. Die alte readarchive-Fassung
    pruefte nur auf truthy, dadurch schaltete auch MONGOAUTH=false die
    Authentifizierung ein.
  - writeDataArray(client, coll, data) nimmt den Collection-Namen direkt.
    readarchive baut ihn mit dataCollName(styp).
  - getallProperties liefert das Array selbst (readin-Fassung). Die
    readarchive-Fassung mit {error, properties} war dort ungenutzt.
*/
import { MongoClient } from 'mongodb'
import { logit, logerror } from './logit.js'
import { statistics } from './statistics.js'
import { DateTime } from 'luxon'

let DEVELOP = process.env.DEVELOP || 'false'

let MONGOHOST = process.env.MONGOHOST || 'localhost'
let MONGOPORT = process.env.MONGOPORT || 27017
let MONGOAUTH = process.env.MONGOAUTH || 'false'
let MONGOUSRP = process.env.MONGOUSRP || ''
let MONGOBASE = process.env.MONGOBASE || 'sensor_data'

let MONGO_URL = 'mongodb://' + MONGOHOST + ':' + MONGOPORT;  	// URL to mongo database
if (MONGOAUTH == 'true') {
    MONGO_URL = 'mongodb://' + MONGOUSRP + '@' + MONGOHOST + ':' + MONGOPORT + '/?authSource=admin';          // URL to mongo database
}

export const property_coll = 'properties'
const data_collection = 'sensors'

// Datencollection eines Sensortyps, z.B. dataCollName('noise') -> 'noise_sensors'
export const dataCollName = (styp) => {
    return styp + '_' + data_collection
}

const addandshowstatistics = (client, text, field, start) => {
    statistics[field] = DateTime.now().diff(start, ['seconds']).toObject().seconds
    logit(`Write ${text} to mongoDB: Time: ${statistics[field]} sec.`)
}

export const connectMongo = async () => {
    try {
        if(DEVELOP === 'true')  {
            logit(`Try to connect to ${MONGO_URL}`)
        } else {
            logit(`Try to connect to ${'mongodb://' + MONGOHOST + ':' + MONGOPORT}`)
        }
        let client = await MongoClient.connect(MONGO_URL)
        if ( DEVELOP === 'true') {
            logit(`Mongodbase connected to ${MONGO_URL}`)
        } else {
            logit('Mongodbase connected')
        }
        return client
    }
    catch (error) {
        throw (error)
    }
}

export const closeMongo = async (client) => {
    try {
        await client.close()
    }
    catch(error){
        throw(error)
    }
}

/* ***************************************************
// READ routines
******************************************************/

// Read properties from the database - oeffnet und schliesst selbst
export const readProperties = async (query, limit = 0) => {
    let ret = {err: null, properties: null}
    let client = await connectMongo()
    try {
        if ("sid" in query) {                               // if sid is given, read property for sid
            ret.properties = await client.db(MONGOBASE).collection(property_coll).findOne({_id: query.sid})
        } else {                                            // otherwise read props corresponding to query
            ret.properties = await client.db(MONGOBASE).collection(property_coll).find(query).limit(limit).toArray()
        }
    } catch (e) {
        ret.err = e
    }
    finally {
        client.close()
    }
    return ret
}

export const getallProperties = async (client) => {
    return await client.db(MONGOBASE).collection(property_coll)
        .find().sort({ _id: 1 }).toArray()
}

export const checkOneproperty = async (client, sid) => {
    return await client.db(MONGOBASE).collection(property_coll)
        .findOne({ _id: sid })
}

export const getOneproperty = async (client, sid) => {
    let ret = {error: false, errortext: '', property: null}
    try {
        ret.property = await client.db(MONGOBASE).collection(property_coll)
            .findOne({_id: sid})
    } catch (e) {
        ret =  {error: true, errortext: e}
    }
    return ret
}

export const getOneSensorOneday = async (client, sid, day, styp) => {
    let ret = {error: false, errortext: '', date: []}
    // muss dieselbe Zone benutzen wie die gespeicherten Zeitstempel (UTC),
    // sonst passt das Suchfenster nicht auf die Daten des Tages
    let d = DateTime.fromFormat(day, "yyyy-LL-dd", { zone: 'utc' })
    let start = d.startOf('day').toJSDate()
    let end = d.startOf('day').plus({day:1}).toJSDate()
    try {
        let erg = await client.db(MONGOBASE).collection(dataCollName(styp))
            .find({sensorid: sid, datetime: {$gte: start, $lt: end}},{sort: {datetime: 1}}).toArray()
        ret.data = erg
    } catch(e) {
        ret.error = true
        ret.errortext = e
    }
    return ret
}

export const getLocationIDs = async (client, stype) => {
    let ret = {error: false, errortext: '', locations: []}
    try {
        ret.locations = await client.db(MONGOBASE).collection(property_coll)
            .distinct('location.0.id', {type: stype})
    } catch (e) {
        ret.error = true
        ret.errortext = e
    }
    return ret
}

export const getTHPSensors = async (client, lid) => {
    let ret = {error: false, errortext: '', sensors: []}
    try {
        ret.sensors = await client.db(MONGOBASE).collection(property_coll)
            .findOne({type: 'thp', 'location.0.id': lid}, { projection: {_id: 1}})
    } catch (e) {
        ret.error = true
        ret.errortext = e
    }
    return ret
}

/* ***************************************************
// WRITE routines
******************************************************/

export const writeOneproperty = async (client, prop) => {
    try {
        let result = await client.db(MONGOBASE).collection(property_coll)
            .insertOne(prop)
    } catch (e) {
        if (e.code == 11000) {
            return false
        } else {
            throw (e)
        }
    }
    return true
}

export const writeProperties = async (client, props) => {
    let result
    let startAll = DateTime.now();
    let start
    let coll = client.db(MONGOBASE).collection(property_coll)
    if (props.new.length !== 0) {
        start = DateTime.now();
        try {
            result = await coll.insertMany(props.new)
        } catch (e) {
            logerror(`Write properties new   ${e}`)
        }
        logit(`Write ${props.new.length} properties NEW to mongoDB: Result: ${result.acknowledged}, Time: ${start.diffNow('seconds').toObject().seconds * -1} sec.`)
    }
    if (props.loc.length !== 0) {
        start = DateTime.now()
        try {
            for (let item of props.loc) {
                result = await coll.updateOne({ _id: item._id }, {
                    $set: { location_id: item.location_id },
                    $push: { location: { $each: [item.location[0]], $position: 0 } }
                })
            }
        } catch (e) {
            logerror(`Write properties location   ${e}`)
        }
        logit(`Write ${props.loc.length} properties LOC to mongoDB: Result: ${result.acknowledged}, Time: ${start.diffNow('seconds').toObject().seconds * -1} sec.`)
    }
    if (props.sname.length !== 0) {
        start = DateTime.now()
        try {
            for (let item of props.sname) {
                result = await coll.updateOne({ _id: item._id }, {
                    $push: { name: { $each: [item.name[0]], $position: 0 } }
                })
            }
        } catch (e) {
            logerror(`Write properties samename   ${e}`)
        }
        logit(`Write ${props.sname.length} properties NAME to mongoDB: Result: ${result.acknowledged}, Time: ${start.diffNow('seconds').toObject().seconds * -1} sec.`)
    }
    addandshowstatistics(client, 'properties', 'writePropsTime', startAll)
}

export const writeOneSensor = async (client, data, styp) => {
    let ret = {error: false, errortext: '', inserted: 1}
    try {
        await client.db(MONGOBASE).collection(dataCollName(styp))
            .insertOne(data)
    } catch (e) {
        ret.error = true
        ret.errortext = e
        ret.inserted = 0
    }
    return ret
}

export const writeDataArray = async (client, coll, data) => {
    let result
    let start = DateTime.now();
    try {
        result = await client.db(MONGOBASE).collection(coll)
            .insertMany(data, { ordered: false })
    } catch (e) {
        if (e.code !== 11000) {
            console.error(e)
        }
    }
    addandshowstatistics(client, `${data.length} entries for ${coll}`, `writeMongoData[${coll}]Time`, start)
}

export const writeStatistic = async (client, stat) => {
    let result
    let start = DateTime.now();
    let entry = { timestamp: new Date(), ...stat }
    try {
        result = await client.db(MONGOBASE).collection("statistics")
            .insertOne(entry)
    } catch (e) {
        console.error(e)
    }
    addandshowstatistics(client, `statistics`, `writeStatisticTime`, start)
}

export const bulkWrite = async (client, coll, data) => {
    let start = DateTime.now()
    let result
    try {
        result = await client.db(MONGOBASE).collection(coll)
            .bulkWrite(data, { ordered: false })
    } catch (e) {
        console.error(e)
    }
    addandshowstatistics(client, `Data for ${coll}`, `writeMongoProperties[${coll}]Time`, start)
    return result
}

export const bulkUpdateMapdata = async (client, data) => {
    let start = DateTime.now()
    let result
    try {
        result = await client.db(MONGOBASE).collection("mapdata")
            .bulkWrite(data, { ordered: false })
    } catch (e) {
        console.error(e)
    }
    logit(`Write MapData: Result: ${result}, Time: ${start.diffNow('second').toObject().seconds * -1} sec.`)
    return result
}

/* ***************************************************
// Wartung
******************************************************/

export const dropColl = async (client, coll) => {
    let start = DateTime.now()
    let result
    try {
        result = await client.db(MONGOBASE).collection(coll).drop()
    } catch (e) {
        console.error(e)
    }
    logit(`Drop collection ${coll}: Result: ${result}, Time: ${start.diffNow('second').toObject().seconds * -1} sec.`)
}

export const createIndex = async (client, coll) => {
    let result
    let start = DateTime.now()
    try {
        result = await client.db(MONGOBASE).collection(coll).createIndex({ "location.loc": "2dsphere" })
    } catch (e) {
        console.error(e)
    }
    logit(`Create-Index: Result: ${result}, Time: ${start.diffNow('second').toObject().seconds * -1} sec.`)
}