#!/usr/bin/env python3

"""
Loads Graph embeddings into TrustGraph processing.

FIXME: This hasn't been updated following API gateway change.
"""

import pulsar
from pulsar.schema import JsonSchema
from trustgraph.schema import Triples, Triple, Value, Metadata
import argparse
import os
import time
import pyarrow as pa
import rdflib

from trustgraph.log_level import LogLevel

default_user = 'trustgraph'
default_collection = 'default'
default_pulsar_host = os.getenv("PULSAR_HOST", 'pulsar://localhost:6650')
default_pulsar_api_key = os.getenv("PULSAR_API_KEY", None)

default_output_queue = triples_store_queue

class Loader:

    def __init__(
            self,
            pulsar_host,
            output_queue,
            log_level,
            files,
            user,
            collection,
            pulsar_api_key=None,
    ):

        if pulsar_api_key:
            auth = pulsar.AuthenticationToken(pulsar_api_key)
            self.client = pulsar.Client(
				pulsar_host,
				authentication=auth,
				logger=pulsar.ConsoleLogger(log_level.to_pulsar())
            )
        else:
            self.client = pulsar.Client(
				pulsar_host,
				logger=pulsar.ConsoleLogger(log_level.to_pulsar())
            )

        self.producer = self.client.create_producer(
            topic=output_queue,
            schema=JsonSchema(Triples),
            chunking_enabled=True,
        )

        self.files = files
        self.user = user
        self.collection = collection

    def run(self):

        try:

            for file in self.files:
                self.load_file(file)

        except Exception as e:
            print(e, flush=True)

    def load_file(self, file):

        g = rdflib.Graph()
        g.parse(file, format="turtle")

        for e in g:
            s = Value(value=str(e[0]), is_uri=True)
            p = Value(value=str(e[1]), is_uri=True)
            if type(e[2]) == rdflib.term.URIRef:
                o = Value(value=str(e[2]), is_uri=True)
            else:
                o = Value(value=str(e[2]), is_uri=False)

            r = Triples(
                metadata=Metadata(
                    id=None,
                    metadata=[],
                    user=self.user,
                    collection=self.collection,
                ),
                triples=[ Triple(s=s, p=p, o=o) ]
            )

            self.producer.send(r)

    def __del__(self):
        self.client.close()

def main():

    parser = argparse.ArgumentParser(
        prog='tg-load-turtle',
        description=__doc__,
    )

    parser.add_argument(
        '-p', '--pulsar-host',
        default=default_pulsar_host,
        help=f'Pulsar host (default: {default_pulsar_host})',
    )

    parser.add_argument(
        '-f', '--flow-id',
        default="default",
        help=f'Flow ID (default: default)'
    )
    
    parser.add_argument(
        '--pulsar-api-key',
        default=default_pulsar_api_key,
        help=f'Pulsar API key',
    )

    parser.add_argument(
        '-o', '--output-queue',
        default=default_output_queue,
        help=f'Output queue (default: {default_output_queue})'
    )

    parser.add_argument(
        '-u', '--user',
        default=default_user,
        help=f'User ID (default: {default_user})'
    )

    parser.add_argument(
        '-c', '--collection',
        default=default_collection,
        help=f'Collection ID (default: {default_collection})'
    )

    parser.add_argument(
        '-l', '--log-level',
        type=LogLevel,
        default=LogLevel.ERROR,
        choices=list(LogLevel),
        help=f'Output queue (default: info)'
    )

    parser.add_argument(
        'files', nargs='+',
        help=f'Turtle files to load'
    )

    args = parser.parse_args()

    while True:

        try:
            p = Loader(
                pulsar_host=args.pulsar_host,
                pulsar_api_key=args.pulsar_api_key,
                output_queue=args.output_queue,
                log_level=args.log_level,
                files=args.files,
                user=args.user,
                collection=args.collection,
            )

            p.run()

            print("File loaded.")
            break

        except Exception as e:

            print("Exception:", e, flush=True)
            print("Will retry...", flush=True)

        time.sleep(10)

print("Not implemented.")
#main()