import os
import json
import json_repair
import re
import fitz
import pandas as pd
from utils.gpt_utils import chat
from utils.pdf_util import PDFUtil
from utils.sql_query_util import query_document_fund_mapping
from utils.logger import logger
from utils.biz_utils import add_slash_to_text_as_regex, clean_text


class DataExtraction:
    def __init__(
        self,
        doc_id: str,
        pdf_file: str,
        output_data_folder: str,
        page_text_dict: dict,
        datapoint_page_info: dict,
        document_mapping_info_df: pd.DataFrame,
    ) -> None:
        self.doc_id = doc_id
        self.pdf_file = pdf_file
        if output_data_folder is None or len(output_data_folder) == 0:
            output_data_folder = r"/data/emea_ar/output/extract_data/docs/"
        os.makedirs(output_data_folder, exist_ok=True)

        self.output_data_json_folder = os.path.join(output_data_folder, "json/")
        os.makedirs(self.output_data_json_folder, exist_ok=True)

        self.output_data_excel_folder = os.path.join(output_data_folder, "excel/")
        os.makedirs(self.output_data_excel_folder, exist_ok=True)

        if page_text_dict is None or len(page_text_dict.keys()) == 0:
            self.page_text_dict = self.get_pdf_page_text_dict()
        else:
            self.page_text_dict = page_text_dict
        if document_mapping_info_df is None or len(document_mapping_info_df) == 0:
            self.document_mapping_info_df = query_document_fund_mapping(doc_id)
        else:
            self.document_mapping_info_df = document_mapping_info_df
        self.datapoint_page_info = datapoint_page_info
        self.page_nums_with_datapoints = self.get_page_nums_from_datapoint_page_info()

        self.datapoints = self.get_datapoints_from_datapoint_page_info()
        self.instructions_config = self.get_instructions_config()
        self.datapoint_level_config = self.get_datapoint_level()
        self.datapoint_name_config = self.get_datapoint_name()

    def get_instructions_config(self) -> dict:
        instructions_config_file = r"./instructions/data_extraction_prompts_config.json"
        with open(instructions_config_file, "r", encoding="utf-8") as f:
            instructions_config = json.load(f)
        return instructions_config

    def get_datapoint_level(self) -> dict:
        datapoint_level_file = r"./configuration/datapoint_level.json"
        with open(datapoint_level_file, "r", encoding="utf-8") as f:
            datapoint_level = json.load(f)
        return datapoint_level

    def get_datapoint_name(self) -> dict:
        datapoint_name_file = r"./configuration/datapoint_name.json"
        with open(datapoint_name_file, "r", encoding="utf-8") as f:
            datapoint_name = json.load(f)
        return datapoint_name

    def get_pdf_page_text_dict(self) -> dict:
        pdf_util = PDFUtil(self.pdf_file)
        success, text, page_text_dict = pdf_util.extract_text()
        return page_text_dict

    def get_datapoints_from_datapoint_page_info(self) -> list:
        datapoints = list(self.datapoint_page_info.keys())
        if "doc_id" in datapoints:
            datapoints.remove("doc_id")
        return datapoints

    def get_page_nums_from_datapoint_page_info(self) -> list:
        page_nums_with_datapoints = []
        for datapoint, page_nums in self.datapoint_page_info.items():
            if datapoint == "doc_id":
                continue
            page_nums_with_datapoints.extend(page_nums)
        page_nums_with_datapoints = list(set(page_nums_with_datapoints))
        # sort the page numbers
        page_nums_with_datapoints.sort()
        return page_nums_with_datapoints

    def extract_data(self) -> dict:
        """
        keys are
         doc_id, page_index, datapoint, value, raw_fund_name, fund_id, fund_name, raw_share_name, share_id, share_name
        """
        data_list = []
        pdf_page_count = len(self.page_text_dict.keys())
        handled_page_num_list = []
        for page_num, page_text in self.page_text_dict.items():
            if page_num in handled_page_num_list:
                continue
            page_datapoints = self.get_datapoints_by_page_num(page_num)
            if len(page_datapoints) == 0:
                continue
            extract_data = self.extract_data_by_page(
                page_num,
                page_text,
                page_datapoints,
                need_exclude=False,
                exclude_data=None,
            )
            data_list.append(extract_data)

            page_data_list = extract_data.get("extract_data", {}).get("data", [])

            current_page_data_count = len(page_data_list)
            if current_page_data_count > 0:
                count = 1
                # some pdf documents have multiple pages for the same data
                # and the next page may without table header with data point keywords.
                # the purpose is try to get data from the next page
                current_text = page_text
                
                while count < 3:
                    try:
                        next_page_num = page_num + count
                        if next_page_num >= pdf_page_count:
                            break
                        next_datapoints = page_datapoints
                        if next_page_num in self.page_nums_with_datapoints:
                            should_continue = False
                            next_datapoints = self.get_datapoints_by_page_num(next_page_num)
                            if len(next_datapoints) == 0:
                                should_continue = True
                            else:
                                for next_datapoint in next_datapoints:
                                    if next_datapoint not in page_datapoints:
                                        should_continue = True
                                        break
                                next_datapoints.extend(page_datapoints)
                                # remove duplicate datapoints
                                next_datapoints = list(set(next_datapoints))
                            if not should_continue:
                                break
                        next_page_text = self.page_text_dict.get(next_page_num, "")
                        target_text = current_text + next_page_text
                        # try to get data by current page_datapoints
                        next_page_extract_data = self.extract_data_by_page(
                            next_page_num,
                            target_text,
                            next_datapoints,
                            need_exclude=True,
                            exclude_data=page_data_list,
                        )
                        next_page_data_list = next_page_extract_data.get(
                            "extract_data", {}
                        ).get("data", [])
                        
                        if next_page_data_list is not None and len(next_page_data_list) > 0:
                            for current_page_data in page_data_list:
                                if current_page_data in next_page_data_list:
                                    next_page_data_list.remove(current_page_data)
                            next_page_extract_data["extract_data"][
                                "data"
                            ] = next_page_data_list
                            data_list.append(next_page_extract_data)
                            handled_page_num_list.append(next_page_num)
                        else:
                            break
                        count += 1
                    except Exception as e:
                        logger.error(f"Error in extracting data from next page: {e}")
                        break

        json_data_file = os.path.join(
            self.output_data_json_folder, f"{self.doc_id}.json"
        )
        with open(json_data_file, "w", encoding="utf-8") as f:
            json.dump(data_list, f, ensure_ascii=False, indent=4)

        data_df = pd.DataFrame(data_list)
        data_df.reset_index(drop=True, inplace=True)
        excel_data_file = os.path.join(
            self.output_data_excel_folder, f"{self.doc_id}.xlsx"
        )
        with pd.ExcelWriter(excel_data_file) as writer:
            data_df.to_excel(writer, sheet_name="extract_data", index=False)

        return data_list

    def extract_data_by_page(
        self,
        page_num: int,
        page_text: str,
        page_datapoints: list,
        need_exclude: bool = False,
        exclude_data: list = None,
    ) -> dict:
        """
        keys are
         doc_id, page_index, datapoint, value, raw_fund_name, fund_id, fund_name, raw_share_name, share_id, share_name
        """
        logger.info(f"Extracting data from page {page_num}")
        instructions = self.get_instructions_by_datapoints(
            page_text, page_datapoints, need_exclude, exclude_data
        )
        response, with_error = chat(
            instructions, response_format={"type": "json_object"}
        )
        if with_error:
            logger.error(f"Error in extracting tables from page")
            return ""
        try:
            data = json.loads(response)
        except:
            try:
                data = json_repair.loads(response)
            except:
                data = {"data": []}
        data_dict = {"doc_id": self.doc_id}
        data_dict["page_index"] = page_num
        data_dict["datapoints"] = ", ".join(page_datapoints)
        data_dict["page_text"] = page_text
        data_dict["instructions"] = instructions
        data_dict["raw_answer"] = response
        data_dict["extract_data"] = data
        return data_dict

    def get_datapoints_by_page_num(self, page_num: int) -> list:
        datapoints = []
        for datapoint in self.datapoints:
            if page_num in self.datapoint_page_info[datapoint]:
                datapoints.append(datapoint)
        return datapoints

    def get_instructions_by_datapoints(
        self,
        page_text: str,
        datapoints: list,
        need_exclude: bool = False,
        exclude_data: list = None,
    ) -> str:
        """
        Get instructions to extract data from the page by the datapoints
        Below is the instructions sections:
        summary: string
        reported_name by datapoints: dict
        data_business_features: dict
            common: list
            investment_level by datapoints: dict
            data_value_range by datapoints: dict
            special_rule by datapoints: dict
        special_cases: dict
            common: list
                title
                contents
            special_case by datapoints: list
                title
                contents
        output_requirement
            common: list
            fund_level: list
            share_level: dict
                fund_name: list
                share_name: list
                ogc_value: list
                ter_value: list
                performance_fee_value: list
        end
        """
        instructions = [f"Context:\n{page_text}\n\nInstructions:\n"]
        datapoint_name_list = []
        for datapoint in datapoints:
            datapoint_name = self.datapoint_name_config.get(datapoint, "")
            datapoint_name_list.append(datapoint_name)

        summary = self.instructions_config.get("summary", "\n")
        instructions.append(summary.format(", ".join(datapoint_name_list)))
        instructions.append("\n")

        instructions.append("Datapoints Reported name:\n")
        reported_name_info = self.instructions_config.get("reported_name", {})
        for datapoint in datapoints:
            reported_name = reported_name_info.get(datapoint, "")
            instructions.append(reported_name)
            instructions.append("\n")
        instructions.append("\n")

        instructions.append("Data business features:\n")
        data_business_features = self.instructions_config.get(
            "data_business_features", {}
        )
        common = "\n".join(data_business_features.get("common", []))
        instructions.append(common)
        instructions.append("\n")

        instructions.append("Datapoints investment level:\n")
        investment_level_info = data_business_features.get("investment_level", {})
        for datapoint in datapoints:
            investment_level = investment_level_info.get(datapoint, "")
            instructions.append(investment_level)
            instructions.append("\n")
        instructions.append("\n")

        instructions.append("Datapoints value range:\n")
        data_value_range_info = data_business_features.get("data_value_range", {})
        for datapoint in datapoints:
            data_value_range = data_value_range_info.get(datapoint, "")
            instructions.append(data_value_range)
            instructions.append("\n")
        instructions.append("\n")

        special_rule_info = data_business_features.get("special_rule", {})
        with_special_rule_title = False
        for datapoint in datapoints:
            special_rule_list = special_rule_info.get(datapoint, [])
            if len(special_rule_list) > 0:
                if not with_special_rule_title:
                    instructions.append("Special rule:\n")
                    with_special_rule_title = True
                special_rule = "\n".join(special_rule_list)
                instructions.append(special_rule)
                instructions.append("\n\n")
        instructions.append("\n")

        instructions.append("Special cases:\n")
        special_cases = self.instructions_config.get("special_cases", {})
        special_cases_common_list = special_cases.get("common", [])
        for special_cases_common in special_cases_common_list:
            title = special_cases_common.get("title", "")
            instructions.append(title)
            instructions.append("\n")
            contents_list = special_cases_common.get("contents", [])
            contents = "\n".join(contents_list)
            instructions.append(contents)
            instructions.append("\n\n")

        for datapoint in datapoints:
            special_case_list = special_cases.get(datapoint, [])
            for special_case in special_case_list:
                title = special_case.get("title", "")
                instructions.append(title)
                instructions.append("\n")
                contents_list = special_case.get("contents", [])
                contents = "\n".join(contents_list)
                instructions.append(contents)
                instructions.append("\n\n")
            instructions.append("\n")

        instructions.append("Output requirement:\n")
        output_requirement = self.instructions_config.get("output_requirement", {})
        output_requirement_common_list = output_requirement.get("common", [])
        instructions.append("\n".join(output_requirement_common_list))
        instructions.append("\n")

        share_datapoint_value_example = {}
        share_level_config = output_requirement.get("share_level", {})

        example_list = []
        for datapoint in datapoints:
            investment_level = self.datapoint_level_config.get(datapoint, "")
            if investment_level == "fund_level":
                fund_level_example_list = output_requirement.get("fund_level", [])
                for example in fund_level_example_list:
                    try:
                        sub_example_list = json.loads(example)
                    except:
                        sub_example_list = json_repair.loads(example)
                    example_list.extend(sub_example_list)
            elif investment_level == "share_level":
                share_datapoint_value_example[datapoint] = share_level_config.get(
                    f"{datapoint}_value", []
                )

        share_datapoint_list = list(share_datapoint_value_example.keys())
        instructions.append(f"Example:\n")
        if len(share_datapoint_list) > 0:
            fund_name_example_list = share_level_config.get("fund_name", [])
            share_name_example_list = share_level_config.get("share_name", [])

            for index in range(len(fund_name_example_list)):
                example_dict = {
                    "fund name": fund_name_example_list[index],
                    "share name": share_name_example_list[index],
                }
                for share_datapoint in share_datapoint_list:
                    share_datapoint_values = share_datapoint_value_example[
                        share_datapoint
                    ]
                    if index < len(share_datapoint_values):
                        example_dict[share_datapoint] = share_datapoint_values[index]
                example_list.append(example_dict)
        example_data = {"data": example_list}
        instructions.append(json.dumps(example_data, ensure_ascii=False, indent=4))
        instructions.append("\n")
        instructions.append("\n")

        end_list = self.instructions_config.get("end", [])
        instructions.append("\n".join(end_list))
        instructions.append("\n")

        if need_exclude and exclude_data is not None and isinstance(exclude_data, list):
            instructions.append("Please exclude below data from output:\n")
            instructions.append(json.dumps(exclude_data, ensure_ascii=False, indent=4))
            instructions.append("\n")
            instructions.append("\n")
        instructions.append("Answer:\n")

        instructions_text = "".join(instructions)
        return instructions_text