import requests
import pandas as pd
import datetime
import io
from uuid import uuid4
import ics
from typing import Tuple

from utils import split_csv_row

doc_uuid = "1iSA5LsNdarYqrZRxE76lE2VkEsoQksIu6rFG7VAfCNQ"

planning_gid = "1001381542"
creneau_gid = "1884137958"
benevole_gid = "2065754071"


def build_sheet_url(doc_id, sheet_id):
    return f"https://docs.google.com/spreadsheets/d/{doc_id}/export?format=csv&gid={sheet_id}"


def downloadAndSave(doc_ui, sheet_gid, fname):
    url = build_sheet_url(doc_ui, sheet_gid)
    print("Downloading " + fname)
    rep = requests.get(url)
    with open(fname, "wb") as f:
        f.write(rep.content)


def getPlanningDataFrame(csv_filename, starting_date, skip_column=3):
    list_creneau = []
    with io.open(csv_filename, "r", encoding="utf-8") as f:
        datas = [split_csv_row(s.replace("\n", "")) for s in f.readlines()]

    def getDate(day: str):
        s = day.lower()
        if s.startswith("jeudi"):
            return starting_date
        elif s.startswith("vendredi"):
            return starting_date + datetime.timedelta(days=1)
        elif s.startswith("samedi"):
            return starting_date + datetime.timedelta(days=2)
        elif s.startswith("dimanche"):
            return starting_date + datetime.timedelta(days=3)
        elif s.startswith("lundi"):
            return starting_date + datetime.timedelta(days=4)

    def getTime(time_str: str):
        l = time_str.split("h")
        hours = int(l[0])
        if hours < 5:
            hours += 24
        if len(l) > 1 and l[1] != "":
            return datetime.timedelta(hours=hours, minutes=int(l[1]))
        else:
            return datetime.timedelta(hours=hours)

    def getStartEnd(time_str: str):
        l = time_str.split("-")
        if len(l) == 2:
            return getTime(l[0]), getTime(l[1])
        else:
            start = getTime(time_str.split("+")[0])
            return start, start + datetime.timedelta(hours=1)

    # Parse headers
    headers = datas[skip_column : skip_column + 2]
    days = headers[0]
    hours = headers[1]
    column_to_dates = {}
    assert len(hours) == len(hours)
    for i in range(skip_column, len(days)):
        days[i] = getDate(days[i])
        start, end = getStartEnd(hours[i])
        column_to_dates[i] = {"start": days[i] + start, "end": days[i] + end}

    list_creneau = []
    for i in range(5, len(datas)):
        row = datas[i]
        current_benevole_name = ""
        current_time = None
        for j in range(skip_column, len(row)):
            if (current_benevole_name != "") and (
                row[j] == "" or row[j] != current_benevole_name
            ):
                new_creneau = {
                    "id": uuid4(),
                    "description_id": row[0],
                    "nom": row[1],
                    "benevole_nom": current_benevole_name,
                    "ligne": i + 1,
                    **current_time,
                }
                list_creneau.append(new_creneau)
                current_benevole_name = ""
                current_time = None
            if row[j] != "":
                current_benevole_name = row[j]
                if current_time is None:
                    current_time = column_to_dates[j].copy()
                else:
                    current_time["end"] = column_to_dates[j]["end"]
        if current_benevole_name != "":
            new_creneau = {
                "id": uuid4(),
                "nom": row[1],
                "benevole_nom": current_benevole_name,
                **current_time,
                "ligne": i + 1,
            }
            list_creneau.append(new_creneau)

    print(f"{len(list_creneau)} créneaux trouvés")
    return pd.DataFrame.from_dict(list_creneau)


def getContactDataFrame(csv_filename: str, skiprows: int = 2) -> pd.DataFrame:
    df_contact = pd.read_csv(csv_filename, skiprows=skiprows)
    column_to_drop = [name for name in df_contact.columns if "Unnamed" in name]
    df_contact.drop(column_to_drop, axis=1, inplace=True)

    # Filter out empty name
    df_contact = df_contact[~df_contact.Nom.isnull()]
    df_contact.reset_index()
    return df_contact


def getCreneauDataFrame(csv_filename: str) -> pd.DataFrame:
    df_creneau = pd.read_csv(csv_filename)
    df_creneau.columns = ["nom", "lieu", "description", "responsable"]
    return df_creneau


def getDataFrameFromGsheet(
    doc_uuid: str,
    planning_id="1001381542",
    creneau_id="1884137958",
    benevole_id="2065754071",
    suffix="",
    starting_date=datetime.datetime(2021, 9, 8),
) -> Tuple[pd.DataFrame, pd.DataFrame, pd.DataFrame]:
    fname_planning = f"./data/planning{suffix}.csv"
    fname_creneau = f"./data/creneau{suffix}.csv"
    fname_contact = f"./data/benevole{suffix}.csv"
    downloadAndSave(doc_uuid, planning_id, fname_planning)
    downloadAndSave(doc_uuid, creneau_id, fname_creneau)
    downloadAndSave(doc_uuid, benevole_id, fname_contact)
    return (
        getPlanningDataFrame(fname_planning, starting_date),
        getCreneauDataFrame(fname_creneau),
        getContactDataFrame(fname_contact),
    )