import os
import json
import numpy
from itertools import islice
from argparse import Namespace
import triton_python_backend_utils as pb_utils
from onmt.translate.translator import build_translator


class TritonPythonModel:
    def initialize(self, args):
        current_path = os.path.dirname(os.path.abspath(__file__))
        self.source_lang, self.target_lang = input_lang, output_lang
        self.model_config = json.loads(args["model_config"])
        self.device_id = int(json.loads(args["model_instance_device_id"]))
        target_config = pb_utils.get_output_config_by_name(
            self.model_config, "OUTPUT_SENT"
        )
        self.target_dtype = pb_utils.triton_string_to_numpy(target_config["data_type"])
        try:
            self.translator = build_translator(
                Namespace(
                    tgt_prefix=False,
                    alpha=0.0,
                    batch_type="sents",
                    beam_size=15,
                    beta=-0.0,
                    block_ngram_repeat=0,
                    coverage_penalty="none",
                    data_type="text",
                    dump_beam="",
                    fp32=True,
                    gpu=self.device_id,
                    ignore_when_blocking=[],
                    length_penalty="none",
                    max_length=100,
                    max_sent_length=None,
                    min_length=0,
                    models=[f"{os.path.join(current_path, 'translator.pt')}"],
                    n_best=1,
                    output="/dev/null",
                    phrase_table="",
                    random_sampling_temp=1.0,
                    random_sampling_topk=1,
                    ratio=-0.0,
                    replace_unk=True,
                    report_align=False,
                    report_time=False,
                    seed=829,
                    stepwise_penalty=False,
                    tgt=None,
                    verbose=False,
                ),
                report_score=False,
            )
        except:
            self.translator = build_translator(
                Namespace(
                    tgt_prefix=False,
                    alpha=0.0,
                    batch_type="sents",
                    beam_size=15,
                    beta=-0.0,
                    block_ngram_repeat=0,
                    coverage_penalty="none",
                    data_type="text",
                    dump_beam="",
                    fp32=True,
                    gpu=-1,
                    ignore_when_blocking=[],
                    length_penalty="none",
                    max_length=100,
                    max_sent_length=None,
                    min_length=0,
                    models=[f"{os.path.join(current_path, 'translator.pt')}"],
                    n_best=1,
                    output="/dev/null",
                    phrase_table="",
                    random_sampling_temp=1.0,
                    random_sampling_topk=1,
                    ratio=-0.0,
                    replace_unk=True,
                    report_align=False,
                    report_time=False,
                    seed=829,
                    stepwise_penalty=False,
                    tgt=None,
                    verbose=False,
                ),
                report_score=False,
            )

    def clean_output(self, text):
        text = text.replace("@@ ", "")
        text = text.replace("\u200c", "")
        if text.startswith("<to-gu> "):
            text = text[8:]
        if text.endswith(" <to-gu>"):
            text = text[:-8]
        return text

    def execute(self, requests):
        source_list = [
            pb_utils.get_input_tensor_by_name(request, "INPUT_SENT_TOKENIZED")
            for request in requests
        ]
        bsize_list = [source.as_numpy().shape[0] for source in source_list]
        src_sentences = [
            s[0].decode("utf-8").strip().split(" ")
            for source in source_list
            for s in source.as_numpy()
        ]
        tgt_sentences = [
            self.clean_output(result[0])
            for result in self.translator.translate(src_sentences, batch_size=128)[1]
        ]
        responses = [
            pb_utils.InferenceResponse(
                output_tensors=[
                    pb_utils.Tensor(
                        "OUTPUT_SENT",
                        numpy.array(
                            [[s] for s in islice(tgt_sentences, bsize)], dtype="object"
                        ).astype(self.target_dtype),
                    )
                ]
            )
            for bsize in bsize_list
        ]
        return responses

    def finalize(self):
        del self.translator