import fs from 'fs'
import readline from 'readline'
import * as neo4j from 'neo4j-driver'
import { nextTick } from 'process'

const line$ = (path: string) => readline.createInterface({
    input: fs.createReadStream(path),
    crlfDelay: Infinity
})

const templateGTnode = (args:any) => {
    let tmp = 'CREATE (gt:GoTerm {'
    Object.keys(args).forEach((dd:any,ii:number) => {
        const delim = ii === 0 ? '' : ', '
        tmp += `${delim}${dd}: "${args[dd].replace(/"/g,'')}"`
    })
    tmp += '})'
    return tmp
}

const templateEdge = (from:string, to:string) => {
    return `MATCH (from:GoTerm {id: '${from}'})
    MATCH (to:GoTerm {id: '${to}'})
    MERGE (from)-[rel:is_a]->(to)`
}

const templateSymbol = (args:any) => {
    let tmp = 'CREATE (sy:Symbol {'
    Object.keys(args).forEach((dd:any,ii:number) => {
        const delim = ii === 0 ? '' : ', '
        tmp += `${delim}${dd}: "${args[dd]}"`
    })
    tmp += `})`
    return tmp
}

const templateEdgeGoa = (fromSymbol:string, toGoTerm:string, relName:string, args:any) => {
    const tmpArgs = Object.keys(args).reduce((p,c)=> p += `${c}: "${args[c]}", `, "").slice(0, -2)
    return `MATCH (from:Symbol {name: '${fromSymbol}'})
    MATCH (to:GoTerm {id: '${toGoTerm}'})
    MERGE (from)-[rel:${relName} {${tmpArgs}}]->(to)`
}

const readObo = async (oboPath:string) => {
    let delim = false
    const vertexes = []
    const edges = []
    let result = {} as {[key:string]: any}
    for await (const line of line$(oboPath)) {
        if (line === '[Term]') {
            delim = true
        } else if (line === '' && delim) {
            delim = false
            vertexes.push(templateGTnode(result))
            if(result?.is_a) {
                if (/^GO:[0-9]*/.test(result.is_a)) {
                    edges.push(templateEdge(result.id, result.is_a.match(/^GO:[0-9]*/)[0]))
                }
            }
            result = {}
        }
        else if (delim) result[line.split(': ')[0]] = line.split(': ')[1].replace("\"","")
    }
    return {vertexes, edges}
}

const readGoa = async (goaPath:string) => {
    const header = [
        'database', 'ID', 'Symbol', 'Qualifier', 
        'GO_Term', 'Evidence', 'Evidence_Code', 
        'With', 'From','Name', 'Alternative_symbols', 
        'Class', 'Taxon', 'Date', 'Origin'
    ]
    
    const vertexes = []
    const edges = []
    const allSymbols = {} as any
    for await (const line of line$(goaPath)) {
        if(/^[^!]/.test(line)) {
            const obj:any = line.split('\t').filter((e:any)=>e).reduce((p,c,i) => ({...p, [header[i]] : /*separator.test(c) ? c.split('|') :*/ c}), {})
            if (typeof allSymbols[obj.Symbol] === 'undefined') {
                vertexes.push(templateSymbol({
                    name: obj.Symbol,
                    class: obj.Class,
                    fullName: obj.Name, 
                    alternativeName: obj.Alternative_symbols,
                    taxon: obj.Taxon,
                    goaID: obj.ID, 
                    goaDB: obj.Origin
                }))
                allSymbols[obj.Symbol] = ''
            }
            edges.push(templateEdgeGoa(obj.Symbol, obj.GO_Term, obj.Qualifier.replace("|","-"), {
                goaEvidence: obj.Evidence,
                goaEvidenceCode: obj.Evidence_Code,
                goaWith: obj.With,
                goaFrom: obj.From,
                goaDate: obj.Date
            }))
        }
    }
    return {vertexes, edges}
}

const runNeo = (session:any, sql:string) => {
    return new Promise<void>((resolve, reject) => {
        try {
            session.run(sql).then((result:any) => resolve(result)).catch((err:any) => reject(err))
        } catch (error) {
            reject(error)
        }
    })
}

(async()=>{
    const oboPath   = '/home/thomas/NGS/ref/GO/go-basic.obo'
    const goaPath   = '/home/thomas/NGS/ref/GO/goa_human.gaf'

    var driver = neo4j.driver(
        'neo4j://localhost',
        neo4j.auth.basic('neo4j', '123456')
    )
    var session = driver.session()

    // OBO
    /*
    const rr = await readObo(oboPath)
    for (const v of rr.vertexes) {
        console.log('Inserting OBO vertexes...');
        await runNeo(session, v)
    }
    for (const e of rr.edges) {
        console.log('Inserting OBO edges...');
        await runNeo(session, e)
    }
    */

    // GOA
    const goaAll = await readGoa(goaPath)
    console.log(goaAll.edges[0]);
    
    // for (const v of goaAll.vertexes) {
    //     console.log('Inserting GOA vertexes...');
    //     await runNeo(session, v)
    // }
    for (const e of goaAll.edges) {
        // console.log('Inserting GOA edges...');
        await runNeo(session, e)
    }
    await driver.close()
})()