"""
Several preprocessor classes.
Author: md
"""

from preprocessor.base import BasePreprocessorConfig, BasePreprocessor
from const import (
    DIALOGUE_SUMMARY,
    DIALOGUE_CONTEXT_TO_RESPONSE_GENERATION,
    DIALOG,
    KNOWLEDGE,
    UTTERANCE,
    ROLES,
    EMOTION_RECOGNITION,
    VALUE,
    ABSA,
    CHARACTER_IDENTIFICATION,
    DIALOGUE_STATE_TRACKING,
    DOCUMENT_GROUNDED_CONVERSATION,
    TEXT2SQL,
    SLOT_FILLING,
    ROLE_RELATION_RECOGNITION,
    QUESTION_IN_CONTEXT_REWRITING,
    NATURAL_LANGUAGE_INFERENCE,
    MACHINE_READING_COMPREHENSION,
    MULTIPLE_CHOICE_QUESTION_ANSWERING,
    INTENT_DETECTION,
    DATA_TO_TEXT,
    CHIT_CHAT,
    TRAIN_SPLIT,
)
from typing import Dict, List, Callable
from copy import deepcopy


class SerialConfig(BasePreprocessorConfig):
    def __init__(
        self,
        input_dir: str,
        output_dir: str,
        task: str,
        task_bos_token: str = "<s>",
        knowledge_bos_token: str = "[EK]",
        prompt_bos_token: str = "[C]",
        use_role: bool = True,
        turn_sep: str = None,
        roles_to_build_example: List = None,
        dev_and_test_roles_to_build_example: List = None,
        prompt_func: Callable = None,
        knowledge_func: Callable = None,
        label_func: Callable = None,
        turn_knowledge_func: Callable = None,
        roles_in_history: List[List] = None,
        cur_turn_process_func: Callable = None,
        all_turns_process_func: Callable = None,
        multi_ref_sep: str = None,
        *args,
        **kwargs,
    ) -> None:
        super().__init__(input_dir, output_dir, task, *args, **kwargs)

        self.use_role = use_role
        self.turn_sep = turn_sep
        self.roles_to_build_example = roles_to_build_example
        self.prompt_func = prompt_func
        self.task_bos_token = task_bos_token
        self.knowledge_bos_token = knowledge_bos_token
        self.prompt_bos_token = prompt_bos_token
        self.knowledge_func = knowledge_func
        self.label_func = label_func
        self.turn_knowledge_func = turn_knowledge_func
        self.roles_in_history = roles_in_history
        self.multi_ref_sep = multi_ref_sep
        self.dev_and_test_roles_to_build_example = dev_and_test_roles_to_build_example
        self.cur_turn_process_func = cur_turn_process_func
        self.all_turns_process_func = all_turns_process_func


def concat_roles(roles):
    return ", ".join(roles)


def concat_dial_history(config: SerialConfig, history: List[Dict]):
    # utterance_list = [
    #     f"{concat_roles(turn[ROLES])}: {turn[UTTERANCE].strip()}"
    #     if config.use_role
    #     else turn[UTTERANCE].strip()
    #     for turn in history
    # ]

    utterance_list = []
    for turn in history:
        if (
            config.roles_in_history is not None
            and turn[ROLES] not in config.roles_in_history
        ):
            continue

        if config.use_role:
            utterance_list.append(
                f"{concat_roles(turn[ROLES])}: {turn[UTTERANCE].strip()}"
            )
        else:
            utterance_list.append(turn[UTTERANCE].strip())

    if not utterance_list:
        return "None"

    turn_sep = " "
    if config.turn_sep is not None:
        turn_sep = f" {config.turn_sep} "

    return turn_sep.join(utterance_list)


def concat_history_knowledge_prompt(
    config: SerialConfig, history: str, knowledge: str = "", prompt: str = ""
):
    """Concat `history`, `knowledge` and `prompt`.

    NOTE: the order is fixed now.
    """
    text = ""

    if config.task_bos_token is not None:
        text = f"{config.task_bos_token} "

    text += history

    if knowledge is not None:
        text += f" {config.knowledge_bos_token} {knowledge}"

    if prompt is not None:
        text += f" {config.prompt_bos_token} {prompt}"

    return text


def clean(text):
    return text.replace("\r\n", " ").replace("\n", " ").replace("\r", " ")


def add_prefix_to_label(prefix, split, label):
    tgt = f"{prefix} {label}" if split == "train" else label
    return tgt


class SerialPreprocessor(BasePreprocessor):
    def __init__(self, config: SerialConfig) -> None:
        super().__init__(config)

    def extract_knowledge(self, example: Dict):
        if self.config.knowledge_func is None:
            knowledge = None

        elif (
            KNOWLEDGE not in example
            or not self.config.knowledge_func.__code__.co_argcount
        ):
            knowledge = self.config.knowledge_func()
        else:
            knowledge = self.config.knowledge_func(example[KNOWLEDGE][VALUE])

        return knowledge

    def preprocess_for_dialogue_level(self, split: str, example: Dict, knowledge: str):
        label = self.config.label_func(example)
        tgt = add_prefix_to_label(self.config.task_bos_token, split, label)

        history = concat_dial_history(self.config, example[DIALOG])

        if self.config.prompt_func is None:
            prompt = ""
        elif not self.config.prompt_func.__code__.co_argcount:
            prompt = self.config.prompt_func()

        src = concat_history_knowledge_prompt(self.config, history, knowledge, prompt)

        return [{"src": clean(src), "tgt": clean(tgt)}]

    def preprocess_for_label_level(self, split: str, example: Dict, knowledge: str):
        label_generator = self.config.label_func(example)

        examples = []
        for turn_id, label, extra_args in label_generator:
            tgt = add_prefix_to_label(self.config.task_bos_token, split, label)

            hist = deepcopy(example[DIALOG])
            if self.config.all_turns_process_func is not None:
                hist[turn_id] = self.config.all_turns_process_func(
                    hist[turn_id], *extra_args
                )

            history = concat_dial_history(self.config, hist)

            if self.config.prompt_func is None:
                prompt = ""
            elif not self.config.prompt_func.__code__.co_argcount:
                prompt = self.config.prompt_func()

            src = concat_history_knowledge_prompt(
                self.config, history, knowledge, prompt
            )

            examples.append({"src": clean(src), "tgt": clean(tgt)})

        return examples

    def get_label(
        self, turn, include_current_turn, turn_idx, split, origin_knowledge=None
    ):
        # skip the roles not requiring to build examples
        if (
            split != TRAIN_SPLIT
            and self.config.dev_and_test_roles_to_build_example is not None
        ):
            roles_to_build_example = self.config.dev_and_test_roles_to_build_example
        else:
            roles_to_build_example = self.config.roles_to_build_example
        if (
            roles_to_build_example is not None
            and turn[ROLES] not in roles_to_build_example
        ):
            return None

        # skip the first turn if not including current turn
        if not include_current_turn and turn_idx == 0:
            return None

        if self.config.task != DIALOGUE_STATE_TRACKING:
            try:
                label = self.config.label_func(turn, split=split)
            except:
                label = self.config.label_func(turn, origin_knowledge, split=split)
        else:
            label = self.config.label_func(
                turn, self.ontologies[split], do_train=(split == TRAIN_SPLIT)
            )

        return label

    def preprocess_for_turn_level(
        self,
        split: str,
        example: Dict,
        knowledge: str,
        include_current_turn=False,
        origin_knowledge=None,
    ):
        examples = []
        multiref = []
        for turn_idx, turn in enumerate(example[DIALOG]):
            label = self.get_label(
                turn, include_current_turn, turn_idx, split, origin_knowledge
            )

            if label is None:
                continue

            multiref.append(label)
            # requre to merge and arrive at the final consecutive label
            if (
                self.config.multi_ref_sep is not None
                and split != "train"
                and turn_idx < len(example[DIALOG]) - 1
                and self.get_label(
                    example[DIALOG][turn_idx + 1],
                    include_current_turn,
                    turn_idx + 1,
                    split,
                )
                is not None
            ):
                continue

            if self.config.multi_ref_sep is not None and split != "train":
                label = self.config.multi_ref_sep.join(multiref)

            tgt = add_prefix_to_label(self.config.task_bos_token, split, label)

            end = (turn_idx + 1) if include_current_turn else turn_idx

            hist = deepcopy(example[DIALOG][:end])
            if self.config.cur_turn_process_func is not None:
                hist[-1] = self.config.cur_turn_process_func(hist[-1])

            history = concat_dial_history(self.config, hist)

            if self.config.prompt_func is None:
                prompt = ""
            elif not self.config.prompt_func.__code__.co_argcount:
                prompt = self.config.prompt_func()

            if self.config.turn_knowledge_func is not None:
                knowledge_to_use = self.config.turn_knowledge_func(knowledge, turn)
            else:
                knowledge_to_use = knowledge

            src = concat_history_knowledge_prompt(
                self.config, history, knowledge_to_use, prompt
            )

            examples.append({"src": clean(src), "tgt": clean(tgt)})

            multiref = []

        return examples

    def preprocess_line(self, split: str, example: Dict) -> List[Dict]:
        knowledge = self.extract_knowledge(example)

        # 1. Dialogue Summary
        if self.config.task == DIALOGUE_SUMMARY:
            return self.preprocess_for_dialogue_level(split, example, knowledge)

        # 2. Emotion Recognition
        if self.config.task == EMOTION_RECOGNITION:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 3. Dialogue Context-to-Text Generation
        if self.config.task == DIALOGUE_CONTEXT_TO_RESPONSE_GENERATION:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=False
            )

        # 4. ABSA
        if self.config.task.startswith(ABSA):
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 5. Character Identification
        if self.config.task == CHARACTER_IDENTIFICATION:
            # return self.preprocess_for_turn_level(
            #     split, example, knowledge, include_current_turn=True
            # )
            # return self.preprocess_for_dialogue_level(split, example, knowledge)
            return self.preprocess_for_label_level(split, example, knowledge)

        # 6. Dialogue State Tracking
        if self.config.task == DIALOGUE_STATE_TRACKING:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 7. Document Grounded Conversation
        if self.config.task == DOCUMENT_GROUNDED_CONVERSATION:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=False
            )

        # 8. Text2SQL
        if self.config.task == TEXT2SQL:
            seq_examples = self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

            for idx in range(len(seq_examples)):
                seq_examples[idx]["db_id"] = knowledge["db_id"]

            return seq_examples

        # 9. Slot Filling
        if self.config.task == SLOT_FILLING:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 10. Relation Recognition
        if self.config.task == ROLE_RELATION_RECOGNITION:
            return self.preprocess_for_dialogue_level(split, example, knowledge)

        # 11. Question in Context Rewriting
        if self.config.task == QUESTION_IN_CONTEXT_REWRITING:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 12. Natural Language Inference
        if self.config.task == NATURAL_LANGUAGE_INFERENCE:
            return self.preprocess_for_turn_level(
                split,
                example,
                knowledge,
                include_current_turn=True,
                origin_knowledge=example[KNOWLEDGE][VALUE],
            )

        # 13. Machine Reading Comprehension
        if self.config.task == MACHINE_READING_COMPREHENSION:
            return self.preprocess_for_turn_level(split, example, knowledge)

        # 14. Multiple Choice Question Answering
        if self.config.task == MULTIPLE_CHOICE_QUESTION_ANSWERING:
            return self.preprocess_for_turn_level(
                split,
                example,
                knowledge,
                include_current_turn=True,
                origin_knowledge=example[KNOWLEDGE][VALUE],
            )

        # 15. Intent Detection
        if self.config.task == INTENT_DETECTION:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 16. Data-to-Text
        if self.config.task == DATA_TO_TEXT:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

        # 17. Chit-Chat
        if self.config.task == CHIT_CHAT:
            return self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=False
            )

        if self.config.task == "Semantic Parsing":
            seq_examples = self.preprocess_for_turn_level(
                split, example, knowledge, include_current_turn=True
            )

            return seq_examples