import urllib
from google.oauth2.service_account import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError


SCOPES = ["https://www.googleapis.com/auth/spreadsheets.readonly"]


def get_spreatsheed_service(credentials):
    return build("sheets", "v4", credentials=credentials, cache_discovery=False)


def get_google_creds():
    creds = None
    creds = Credentials.from_service_account_file("credentials.json", scopes=SCOPES)
    return creds


def process_spreadsheet_data(rows):
    processed_data = []
    for row in rows:
        processed_row = convert_spreadsheet_data(row)
        processed_data.append(processed_row) if processed_row else None
    return processed_data


from datetime import datetime

from datetime import datetime

def convert_spreadsheet_data(data, default_year=None):
    """
    Convert spreadsheet row into structured data.
    Expected keys: day, date, plan, actual
    """

    # Skip header or invalid rows
    if not data.get("day") or not data["day"].isdigit():
        return None

    result = {}

    # Convert day
    result["day"] = int(data["day"])

    # Determine default year
    if default_year is None:
        default_year = datetime.now().year

    date_str = data.get("date", "").strip()

    # ---------- DATE HANDLING ----------
    # Accept formats like: "Nov 20", "Dec 3", "Jan 1"
    parsed_date = None

    if date_str:
        try:
            parsed_date = datetime.strptime(f"{date_str} {default_year}", "%b %d %Y")
        except ValueError:
            try:
                parsed_date = datetime.strptime(f"{date_str} {default_year}", "%B %d %Y")
            except:
                parsed_date = None

    # YEAR ROLLOVER (Dec → Jan next year)
    if parsed_date and parsed_date.month == 1 and "Dec" in data.get("date", ""):
        parsed_date = parsed_date.replace(year=default_year + 1)

    result["date"] = parsed_date

    # ---------- PERCENT HANDLING ----------
    def parse_percent(value):
        if not value:
            return 0.0
        v = value.strip().replace(",", ".").replace("%", "")
        try:
            return float(v) / 100.0
        except:
            return 0.0

    result["plan"] = parse_percent(data.get("plan", "0"))
    result["actual"] = parse_percent(data.get("actual", "0"))

    # Gap calculation
    result["gap"] = result["actual"] - result["plan"]

    return result



def fetch_all_sections(service, spreadsheet_id, sheet_name):
    # Fetch a wide range including columns A–L
    result = service.spreadsheets().values().get(
        spreadsheetId=spreadsheet_id,
        range=f"{sheet_name}!A5:M5000"
    ).execute()

    values = result.get("values", [])
    if not values:
        raise ValueError("No data found in sheet")

    data = []
    current_section = None
    current_subsystem = None
    

    for row in values:
        # Pad missing columns to avoid index errors
        row += [""] * (13 - len(row))

        colA, colB, colC, colD, colE, colF, colG, colH, colI, colJ, colK, colL, colM = row
        

        # Detect a SECTION — bold blue rows in Column C
        if colC and not colD and not colE:
            current_section = colC.strip()
            current_subsystem = None
            continue

        # Detect a SUBSYSTEM — indented header in Column D
        if colD and not colE:
            current_subsystem = colD.strip()
            continue

        # Detect a TASK — Column E populated
        if colE:
            task = colE.strip()
            pic = colF.strip()
            start_date = indo_formatted_date(colG.strip())
            finish_date = indo_formatted_date(colH.strip())
            duration = colI.strip()
            plan = colK.strip()
            actual = colL.strip()
            gap = colM.strip()

            data.append({
                "system": current_section,
                "subsystem": current_subsystem,
                "task": task,
                "PIC": pic,
                "start_date": start_date,
                "end_date": finish_date,
                "duration": int(duration),
                "plan": plan,
                "actual": actual,
                "gap": gap
            })

    return data


def indo_formatted_date(date_str, base_year=2025):
    """
    Convert short date like 'Nov 20', '30-Dec', 'Jan 1'
    into: 'Rabu, November 20, 2025'
    If month is January, year becomes 2026.
    """

    # Month mappings
    eng_to_indo_month = {
        "Jan": "Januari", "Feb": "Februari", "Mar": "Maret", "Apr": "April",
        "May": "Mei", "Jun": "Juni", "Jul": "Juli", "Aug": "Agustus",
        "Sep": "September", "Oct": "Oktober", "Nov": "November", "Dec": "Desember"
    }

    indo_days = {
        0: "Senin",
        1: "Selasa",
        2: "Rabu",
        3: "Kamis",
        4: "Jumat",
        5: "Sabtu",
        6: "Minggu"
    }

    # Normalize formats ("30-Dec" → "Dec 30")
    if "-" in date_str:
        d, m = date_str.split("-")
        date_str = f"{m} {d}"

    # Parse using English abbreviation
    try:
        dt = datetime.strptime(f"{date_str} {base_year}", "%b %d %Y")
    except:
        return None

    # Handle year rollover (Jan -> next year)
    if dt.month == 1:
        dt = dt.replace(year=base_year + 1)

    # Convert to Indonesian components
    day_name = indo_days[dt.weekday()]
    month_name = eng_to_indo_month[dt.strftime("%b")]

    return f"{day_name}, {month_name} {dt.day}, {dt.year}"