from datetime import datetime, timezone
import os
import re
from typing import Any, Dict, List, Mapping, Optional
from openpyxl import load_workbook

from backend.app.db.connection import db_session
from backend.app.db.models.uploaded_file import (
    FileSourceEnum,
    UploadedFile,
)
from backend.pashub_fetcher.core_files import infer_file_type
from backend.pashub_fetcher.job import Job
from backend.pashub_fetcher.pashub_client import PashubClient, UnauthorizedError
from backend.pashub_fetcher.sharepoint_subfolders import SharepointSubfolders
from backend.pashub_fetcher.token_getter import get_token_from_local_storage
from utils.logger import setup_logger
from utils.s3 import upload_file_to_s3
from utils.sharepoint.domna_sharepoint_client import DomnaSharepointClient
from utils.sharepoint.domna_sites import DomnaSites


logger = setup_logger()


def extract_jobs(filepath: str) -> List[Job]:
    wb = load_workbook(filepath, data_only=True)
    ws = wb["watford warm homes (wave 3) mai"]

    HEADER_ROW = 3

    headers: Dict[str, int] = {}
    for col in range(1, ws.max_column + 1):
        value = str(ws.cell(row=HEADER_ROW, column=col).value)
        if value:
            headers[value.strip()] = col

    name_col = headers["Name"]
    link_col = headers["Pashub Link"]

    jobs: List[Job] = []

    for row in range(HEADER_ROW + 1, ws.max_row + 1):
        name = ws.cell(row=row, column=name_col).value
        link = ws.cell(row=row, column=link_col).value

        if not name or not link:
            continue

        match = re.search(r"/jobs/([0-9a-fA-F\-]+)/", str(link))
        if not match:
            continue

        jobs.append(
            {
                "id": match.group(1),
                "address": str(name),
            }
        )

    return jobs


def get_pashub_client(email: str, password: str) -> PashubClient:
    token = get_token_from_local_storage(email, password)
    logger.info("Token extracted successfully")
    return PashubClient(token=token)


def upload_job_to_sharepoint(
    sharepoint_client: DomnaSharepointClient,
    base_path: str,
    job: Job,
    job_files: List[str],
) -> None:
    job_path = f"{base_path}/{job['address']}"

    # Create main job folder
    sharepoint_client.makedir(job["address"], base_path)

    # Create subfolders
    for folder in SharepointSubfolders:
        sharepoint_client.makedir(folder.value, job_path)

    # Upload into assessment folder
    assessment_path = f"{job_path}/{SharepointSubfolders.ASSESSMENT.value}"

    for file_path in job_files:
        filename = file_path.split("/")[-1]

        sharepoint_client.upload_file(
            file_path,
            assessment_path,
            filename,
        )


def upload_job_to_s3_and_update_db(job_files: List[str], uprn: str) -> None:
    bucket = "retrofit-energy-assessments-dev"

    base_path = f"documents/uprn/{uprn}"

    uploaded_files: List[UploadedFile] = []

    for file_path in job_files:
        filename = os.path.basename(file_path)
        file_key = f"{base_path}/{filename}"

        upload_file_to_s3(file_path, bucket, file_key)

        # load row to db
        uploaded_files.append(
            UploadedFile(
                s3_file_bucket=bucket,
                s3_file_key=file_key,
                s3_upload_timestamp=datetime.now(timezone.utc),
                uprn=int(uprn),
                file_source=FileSourceEnum.PAS_HUB.value,
                file_type=infer_file_type(filename),
            )
        )

    with db_session() as session:
        session.add_all(uploaded_files)
        session.commit()

    pass


def process_job(
    job: Job,
    pashub_client: PashubClient,
    sharepoint_client: DomnaSharepointClient,
    base_path: str,
) -> List[str]:
    job_id = job["id"]

    uprn: Optional[str] = pashub_client.get_uprn_by_job_id(job_id)
    if uprn:
        logger.info(f"Got UPRN {uprn} for job {job_id}")
    else:
        logger.info(f"No UPRN found for job {job_id}")

    job_files: List[str] = pashub_client.get_core_evidence_files_by_job_id(job_id)

    if uprn:
        logger.info("Uploading files to s3")
        upload_job_to_s3_and_update_db(job_files, uprn)

        # add record of new file in db

    upload_job_to_sharepoint(sharepoint_client, base_path, job, job_files)

    return job_files


def handler(event: Mapping[str, Any], context: Any) -> None:
    BASE_DIR = os.path.dirname(os.path.dirname(__file__))
    filepath = os.path.join(BASE_DIR, "Watford_Warm_Homes_Wave_3_RA Downloads .xlsx")

    jobs: List[Job] = extract_jobs(filepath)
    logger.info("Successfully loaded jobs from spreadsheet")

    pas_hub_email = "random@test.com"
    pas_hub_password = "my_fake_password"

    pashub_client = get_pashub_client(pas_hub_email, pas_hub_password)

    sharepoint_client = DomnaSharepointClient(
        sharepoint_location=DomnaSites.SOCIAL_HOUSING_WAVE_3
    )

    BASE_PATH = "/Osmosis-ACD Projects/Watford Warm Homes/Watford Property Folders (Shared with Client)"

    saved_file_paths: List[str] = []

    for job in jobs:
        try:
            files = process_job(
                job,
                pashub_client,
                sharepoint_client,
                BASE_PATH,
            )
            saved_file_paths.extend(files)

        except UnauthorizedError:
            logger.warning("Token expired - refreshing")

            pashub_client = get_pashub_client(
                pas_hub_email,
                pas_hub_password,
            )

            # retry once
            files = process_job(
                job,
                pashub_client,
                sharepoint_client,
                BASE_PATH,
            )
            saved_file_paths.extend(files)

    logger.info(f"Saved {len(saved_file_paths)} files")


if __name__ == "__main__":
    event = {"Records": [{"body": "{}"}]}
    handler(event, None)