#!/usr/bin/env python3

"""
Loads triples into the knowledge graph.
"""

import asyncio
import argparse
import os
import time
import rdflib
import json
from websockets.asyncio.client import connect

from trustgraph.log_level import LogLevel

default_url = os.getenv("TRUSTGRAPH_URL", 'ws://localhost:8088/')
default_user = 'trustgraph'
default_collection = 'default'

class Loader:

    def __init__(
            self,
            files,
            flow,
            user,
            collection,
            document_id,
            url = default_url,
    ):

        if not url.endswith("/"):
            url += "/"

        url = url + f"api/v1/flow/{flow}/import/triples"

        self.url = url

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

    async def run(self):

        try:

            async with connect(self.url) as ws:
                for file in self.files:
                    await self.load_file(file, ws)

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

    async def load_file(self, file, ws):

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

        def Value(value, is_uri):
            return { "v": value, "e": is_uri }

        triples = []

        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)

            req = {
                "metadata": {
                    "id": self.document_id,
                    "metadata": [],
                    "user": self.user,
                    "collection": self.collection
                },
                "triples": [
                    {
                        "s": s,
                        "p": p,
                        "o": o,
                    }
                ]
            }

            await ws.send(json.dumps(req))

def main():

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

    parser.add_argument(
        '-u', '--api-url',
        default=default_url,
        help=f'API URL (default: {default_url})',
    )

    parser.add_argument(
        '-i', '--document-id',
        required=True,
        help=f'Document ID)',
    )

    parser.add_argument(
        '-f', '--flow-id',
        default="default",
        help=f'Flow ID (default: default)'
    )

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

    args = parser.parse_args()

    while True:

        try:
            p = Loader(
                document_id = args.document_id,
                url = args.api_url,
                flow = args.flow_id,
                files = args.files,
                user = args.user,
                collection = args.collection,
            )

            asyncio.run(p.run())

            print("File loaded.")
            break

        except Exception as e:

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

        time.sleep(10)

main()