import os
from utils import read_tsv_file, parse, write_jsonl_file


def parse_slot_value_table(utterance, slot_labels):
    tokens = utterance.split(" ")
    slot_labels = slot_labels.split()
    start = -1
    record_slot = None
    slots = []
    for idx, slot in enumerate(slot_labels):
        if slot != "O":
            # start
            if start < 0:
                start = idx
                record_slot = slot
            # end
            if idx == (len(slot_labels) - 1) or slot_labels[idx + 1] == "O":
                slots.append((record_slot, start, idx + 1))
                start = -1

    svt = []
    prefix_lengths = [0]
    for token in tokens:
        prefix_lengths.append(prefix_lengths[-1] + len(token) + 1)

    for slot in slots:
        start = prefix_lengths[slot[1]]
        end = prefix_lengths[slot[2]] - 1
        assert utterance[start:end] == " ".join(tokens[slot[1] : slot[2]])

        svt.append(
            {
                "slot": slot[0],
                "values": [{"value": utterance[start:end], "start": start, "end": end}],
                "relation": "=",
            }
        )

    return svt


def preprocess(args, split):
    input_dir = args.input_dir

    for domain in os.listdir(input_dir):
        domain_dir = os.path.join(input_dir, domain)
        outdir = os.path.join(args.output_dir, domain)
        infile = os.path.join(domain_dir, f"{split}.tsv")
        outfile = os.path.join(outdir, f"{split}.jsonl")

        data = read_tsv_file(infile)
        processed_data = []

        for i in range(len(data)):
            row = data.iloc[i]
            utterance = str(row["utterance"])
            intent = str(row["intent"])
            slot_labels = str(row["slot-labels"])

            assert len(utterance.split(" ")) == len(
                slot_labels.split(" ")
            ), f"{utterance}\t{slot_labels}"
            utterance = utterance.replace("\n", "\\n")

            processed_data.append(
                {
                    "turn": "single",
                    "locale": "en",
                    "dialog": [
                        {
                            "roles": ["USER"],
                            "utterance": utterance,
                            "active_intents": [intent],
                            "slots_to_fill": {
                                "intent": intent,
                                "slot_value_table": parse_slot_value_table(
                                    utterance, slot_labels
                                ),
                            },
                        }
                    ],
                }
            )

        write_jsonl_file(processed_data, outfile)


if __name__ == "__main__":
    args = parse()
    preprocess(args, "train")
    preprocess(args, "dev")
    preprocess(args, "test")