import os
import json
import numpy
from glob import iglob
from .apply_bpe import BPE
from ilstokenizer import tokenizer
import triton_python_backend_utils as pb_utils


class TritonPythonModel:
    def initialize(self, args):
        self.target_dtype, self.bpes = pb_utils.triton_string_to_numpy(
            pb_utils.get_output_config_by_name(
                json.loads(args["model_config"]), "INPUT_TEXT_TOKENIZED"
            )["data_type"]
        ), {
            fname.rsplit("/", maxsplit=1)[-1][: -len(".src")]: BPE(
                open(fname, "r", encoding="utf-8")
            )
            for fname in iglob(
                f"{os.path.dirname(os.path.abspath(__file__))}/bpe_src/*.src"
            )
        }

    def preprocess_text(self, text, source_lang, target_lang):
        return (
            f"<to-gu> {text} <to-gu>"
            if source_lang == "en" and target_lang == "gu"
            else text
        )

    def execute(self, requests):
        return [
            pb_utils.InferenceResponse(
                output_tensors=[
                    pb_utils.Tensor(
                        "INPUT_TEXT_TOKENIZED",
                        numpy.array(
                            [[tokenized_sent] for tokenized_sent in tokenized_sents],
                            dtype=self.target_dtype,
                        ),
                    )
                ]
            )
            for tokenized_sents in (
                (
                    self.bpes[
                        f"{input_language_id[0].decode('utf-8')}-{output_language_id[0].decode('utf-8')}"
                    ]
                    .segment(
                        self.preprocess_text(
                            tokenizer.tokenize(input_text[0].decode("utf-8").lower()),
                            input_language_id[0].decode("utf-8"),
                            output_language_id[0].decode("utf-8"),
                        )
                    )
                    .strip()
                    for input_text, input_language_id, output_language_id in zip(
                        input_texts.as_numpy(),
                        input_language_ids.as_numpy(),
                        output_language_ids.as_numpy(),
                    )
                )
                for input_texts, input_language_ids, output_language_ids in (
                    (
                        pb_utils.get_input_tensor_by_name(request, "INPUT_TEXT"),
                        pb_utils.get_input_tensor_by_name(request, "INPUT_LANGUAGE_ID"),
                        pb_utils.get_input_tensor_by_name(
                            request, "OUTPUT_LANGUAGE_ID"
                        ),
                    )
                    for request in requests
                )
            )
        ]

    def finalize(self):
        pass