import re
import os
from utils import write_jsonl_file, parse
from utils import read_jsonl_file


def readfile(input_dir, filename):
    path = os.path.join(input_dir, filename)
    data = read_jsonl_file(path)
    return data


def is_space_language(language):
    if language in ["zh-CN", "ja-JP", "zh-TW"]:
        return False
    return True


def get_slot_value_table(utterance, language, origin):
    svt = []
    pattern = re.compile("\[(.*?)\]", re.S)
    svp_iter = re.finditer(pattern, utterance)

    delta_length = 0  # record the delta length caused by annotation
    prev_end = -1

    for svp in svp_iter:
        start = svp.start()
        end = svp.end()
        annotaed = utterance[start + 1 : end - 1]
        slot, value = map(lambda x: x.strip(), annotaed.split(":"))

        origin_start = start
        is_space = is_space_language(language)
        # offset 1 for non-space-seperated language
        if (
            not is_space
            and start > 0
            and utterance[start - 1] == " "
            and prev_end + 1 != start
        ):
            origin_start -= 1

        # offset the delta length
        origin_start -= delta_length
        origin_end = origin_start + len(value)

        if not is_space:
            if origin[origin_start:origin_end] != value:
                for delta_offset in range(-3, 4):
                    if (
                        origin[delta_offset + origin_start : delta_offset + origin_end]
                        == value
                    ):
                        origin_start += delta_offset
                        origin_end += delta_offset

                        break

            # update delta length
            if (
                origin_end < len(origin)
                and end < len(utterance)
                and origin[origin_end] == utterance[end]
            ):
                delta_length = end - origin_end

            else:
                delta_length = end - origin_end + 1

        else:
            # update delta length
            cur_delta_length = end - start - len(value)

            if not is_space:
                # head space
                if start > 0 and utterance[start - 1] == " ":
                    cur_delta_length += 1

                if end < len(utterance) and utterance[end] == " ":
                    cur_delta_length += 1

            delta_length += cur_delta_length

        assert origin[origin_start:origin_end] == value

        svt.append(
            {
                "slot": slot,
                "value": value,
                "start": origin_start,
                "end": origin_end,
                "relation": "equal_to",
            }
        )

        prev_end = end

    return svt


def preprocess(args):
    filenames = os.listdir(args.input_dir)
    data = {"train": [], "dev": [], "test": [], "MMNLU-22": []}

    total = 0
    for _ in filenames:
        total += 1

    cur = 0

    for filename in filenames:
        cur += 1
        print(f"preprocessing {filename} ({cur}/{total})")
        origin_data = readfile(args.input_dir, filename)
        for line in origin_data:
            partition = line["partition"]

            turn = dict()
            turn["role"] = "ROLE"
            turn["utterance"] = line["utt"]

            domain = None
            if "annot_utt" in line:
                domain = [line["scenario"]]
                bs = []
                goal = dict()
                goal["intent"] = line["intent"]  # format: {domain}_{intent}
                slot_value_table = get_slot_value_table(
                    line["annot_utt"], line["locale"], turn["utterance"]
                )
                goal["slot_value_table"] = slot_value_table
                goal["active_intent"] = line["intent"]
                bs.append(goal)

                turn["belief_state"] = [bs]
            else:
                turn["belief_state"] = []

            if domain is None:
                data[partition].append(
                    {"turn": "single", "locale": line["locale"], "dialog": [turn]}
                )
            else:
                data[partition].append(
                    {
                        "turn": "single",
                        "locale": line["locale"],
                        "dialog": [turn],
                        "domain": domain,
                    }
                )

    for partition in data:
        if data[partition]:
            write_jsonl_file(
                data[partition], os.path.join(args.output_dir, f"{partition}.jsonl")
            )


if __name__ == "__main__":
    args = parse()
    preprocess(args)