from typing import Any, Dict, List

from finnlp.data_sources.sec_filings.prepline_sec_filings.sec_document import (
    REPORT_TYPES,
    VALID_FILING_TYPES,
    SECDocument,
)
from finnlp.data_sources.sec_filings.prepline_sec_filings.sections import (
    ALL_SECTIONS,
    SECTIONS_10K,
    SECTIONS_10Q,
    SECTIONS_S1,
    section_string_to_enum,
    validate_section_names,
)
from finnlp.data_sources.sec_filings.utils import get_filing_urls_to_download

import re
import signal
from datetime import date
from enum import Enum
from typing import Optional
import requests
from ratelimit import limits, sleep_and_retry
import os

try:
    from unstructured.staging.base import convert_to_isd
except Exception:

    class Element:
        pass

    def convert_to_isd(elements: List[Element]) -> List[Dict[str, Any]]:
        """Represents the document elements as an Initial Structured Document (ISD)."""
        isd: List[Dict[str, str]] = []
        for element in elements:
            section = element.to_dict()
            isd.append(section)
        return isd


DATE_FORMAT_TOKENS = "%Y-%m-%d"
DEFAULT_BEFORE_DATE = date.today().strftime(DATE_FORMAT_TOKENS)
DEFAULT_AFTER_DATE = date(2000, 1, 1).strftime(DATE_FORMAT_TOKENS)


class timeout:
    def __init__(self, seconds=1, error_message="Timeout"):
        self.seconds = seconds
        self.error_message = error_message

    def handle_timeout(self, signum, frame):
        raise TimeoutError(self.error_message)

    def __enter__(self):
        try:
            signal.signal(signal.SIGALRM, self.handle_timeout)
            signal.alarm(self.seconds)
        except ValueError:
            pass

    def __exit__(self, type, value, traceback):
        try:
            signal.alarm(0)
        except ValueError:
            pass


# pipeline-api
def get_regex_enum(section_regex):
    """Get sections using regular expression

    Args:
        section_regex (str): regular expression for the section name

    Returns:
        CustomSECSection.CUSTOM: Custom regex section name
    """

    class CustomSECSection(Enum):
        CUSTOM = re.compile(section_regex)

        @property
        def pattern(self):
            return self.value

    return CustomSECSection.CUSTOM


class SECExtractor:
    def __init__(
        self,
        tickers: List[str],
        amount: int,
        filing_type: str,
        start_date: str = DEFAULT_AFTER_DATE,
        end_date: str = DEFAULT_BEFORE_DATE,
        sections: List[str] = ["_ALL"],
        include_amends: bool = True,
    ):
        """_summary_

        Args:
            tickers (List[str]): list of ticker
            amount (int): amount of documenteds
            filing_type (str): 10-K or 10-Q
            start_date (str, optional): start date of getting files. Defaults to DEFAULT_AFTER_DATE.
            end_date (str, optional): end date of getting files. Defaults to DEFAULT_BEFORE_DATE.
            sections (List[str], optional): sections required, check sections names. Defaults to ["_ALL"].
        """
        self.tickers = tickers
        self.amount = amount
        self.filing_type = filing_type
        self.start_date = start_date
        self.end_date = end_date
        self.sections = sections
        self.include_amends = include_amends

    def get_accession_numbers(self, tic: str) -> dict:
        """Get accession numbers and download URL for the SEC filing

        Args:
            tic (str): ticker symbol

        Returns:
            dict: final dictionary for all the urls and years mentioned
        """
        final_dict = {}
        filing_metadata = get_filing_urls_to_download(
            self.filing_type,
            tic,
            self.amount,
            self.start_date,
            self.end_date,
            include_amends=self.include_amends,
        )
        # fm.append(filing_metadata)
        acc_nums_yrs = [
            [
                self.get_year(fm.filing_details_url),
                fm.accession_number.replace("-", ""),
                fm.full_submission_url,
            ]
            for fm in filing_metadata
        ]
        for idx, fm in enumerate(acc_nums_yrs[:-1]):
            if fm[0] is None:
                fm[0] = acc_nums_yrs[idx + 1][0]
        for acy in acc_nums_yrs:
            if tic not in final_dict:
                final_dict.update({tic: []})
            final_dict[tic].append(
                {"year": acy[0], "accession_number": acy[1], "url": acy[2]}
            )
        return final_dict

    def get_year(self, filing_details: str) -> str:
        """Get the year for 10-K and year,month for 10-Q

        Args:
            filing_details (str): filing url

        Returns:
            str: year for 10-K and year,month for 10-Q
        """
        details = filing_details.split("/")[-1]
        if self.filing_type == "10-K":
            matches = re.findall("20\d{2}", details)
        elif self.filing_type == "10-Q":
            matches = re.findall("20\d{4}", details)

        if matches:
            return matches[-1]  # Return the first match
        else:
            return None  # In case no match is found

    def get_all_text(self, section, all_narratives):
        """Join all the text from a section

        Args:
            section (str): section name
            all_narratives (dict): dictionary of section names and text

        Returns:
            _type_: _description_
        """
        all_texts = []
        for text_dict in all_narratives[section]:
            for key, val in text_dict.items():
                if key == "text":
                    all_texts.append(val)
        return " ".join(all_texts)

    def get_text_from_url(self, url: str):
        """Get the text from filing document URL

        Args:
            url (str): url link

        Returns:
            _type_: all texts of sections and filing type of the document
        """
        text = self.get_filing(
            url, company="Unstructured Technologies", email="support@unstructured.io"
        )
        all_narratives, filing_type = self.pipeline_api(text, m_section=self.sections)
        all_narrative_dict = dict.fromkeys(all_narratives.keys())

        for section in all_narratives:
            all_narrative_dict[section] = self.get_all_text(section, all_narratives)

        return all_narrative_dict, filing_type

    def pipeline_api(self, text, m_section=[], m_section_regex=[]):
        """Unsturcured API to get the text

        Args:
            text (str): Text from the filing document URL
            m_section (list, optional): Section required. Defaults to [].
            m_section_regex (list, optional): Custom Section required using regex . Defaults to [].

        Raises:
            ValueError: Invalid document names
            ValueError: Invalid section names

        Returns:
                section and correspoding texts
        """
        validate_section_names(m_section)

        sec_document = SECDocument.from_string(text)
        if sec_document.filing_type not in VALID_FILING_TYPES:
            raise ValueError(
                f"SEC document filing type {sec_document.filing_type} is not supported,"
                f" must be one of {','.join(VALID_FILING_TYPES)}"
            )
        results = {}
        if m_section == [ALL_SECTIONS]:
            filing_type = sec_document.filing_type
            if filing_type in REPORT_TYPES:
                if filing_type.startswith("10-K"):
                    m_section = [enum.name for enum in SECTIONS_10K]
                elif filing_type.startswith("10-Q"):
                    m_section = [enum.name for enum in SECTIONS_10Q]
                else:
                    raise ValueError(f"Invalid report type: {filing_type}")

            else:
                m_section = [enum.name for enum in SECTIONS_S1]
        for section in m_section:
            results[section] = sec_document.get_section_narrative(
                section_string_to_enum[section]
            )

        for i, section_regex in enumerate(m_section_regex):
            regex_num = get_regex_enum(section_regex)
            with timeout(seconds=5):
                section_elements = sec_document.get_section_narrative(regex_num)
                results[f"REGEX_{i}"] = section_elements
        return {
            section: convert_to_isd(section_narrative)
            for section, section_narrative in results.items()
        }, sec_document.filing_type

    @sleep_and_retry
    @limits(calls=10, period=1)
    def get_filing(self, url: str, company: str, email: str) -> str:
        """Fetches the specified filing from the SEC EDGAR Archives. Conforms to the rate
        limits specified on the SEC website.
        ref: https://www.sec.gov/os/accessing-edgar-data"""
        session = self._get_session(company, email)
        response = session.get(url)
        response.raise_for_status()
        return response.text

    def _get_session(
        self, company: Optional[str] = None, email: Optional[str] = None
    ) -> requests.Session:
        """Creates a requests sessions with the appropriate headers set. If these headers are not
        set, SEC will reject your request.
        ref: https://www.sec.gov/os/accessing-edgar-data"""
        if company is None:
            company = os.environ.get("SEC_API_ORGANIZATION")
        if email is None:
            email = os.environ.get("SEC_API_EMAIL")
        assert company
        assert email
        session = requests.Session()
        session.headers.update(
            {
                "User-Agent": f"{company} {email}",
                "Content-Type": "text/html",
            }
        )
        return session