src/utils.py

import folium
import pandas as pd
from folium import plugins
from src.map_utils import legend_macro


EPICENTER_LOCATION = [31.12210171476489, -8.42945837915193]
BORDER_COLOR = "black"

def parse_gg_sheet(url):
    url = url.replace("edit#gid=", "export?format=csv&gid=")
    df = pd.read_csv(url, on_bad_lines="warn")
    return df

# Session for Requests
# session = requests.Session()
# @st.cache_data(persist=True)
# def parse_latlng_from_link(url):
#     try:
#         # extract latitude and longitude from gmaps link
#         if "@" not in url:
#             resp = session.head(url, allow_redirects=True)
#             url = resp.url
#         latlng = url.split("@")[1].split(",")[0:2]
#         return [float(latlng[0]), float(latlng[1])]
#     except Exception as e:
#         return None

def add_latlng_col(df, process_column):
    """Add a latlng column to the dataframe"""
    df = df.assign(latlng=df.iloc[:, process_column].apply(parse_latlng))
    return df

# parse latlng (column 4) to [lat, lng]
import re
def parse_latlng(latlng):
    if pd.isna(latlng):
        return None
        # lat, lng = latlng.split(",")
        # return [float(lat), float(lng)]

    try:
        # check if it matches (30.9529832, -7.1010705) or (30.9529832,-7.1010705)
        if re.match(r"\(\d+\.\d+,\s?-\d+\.\d+\)", latlng):
            lat, lng = latlng[1:-1].split(",")
            return [float(lat), float(lng)]
        # check of it matches 30.9529832, -7.1010705 or 30.9529832,-7.1010705
        elif re.match(r"\d+\.\d+,\s?-\d+\.\d+", latlng):
            lat, lng = latlng.split(",")
            return [float(lat), float(lng)]
        # check if it matches 30,9529832, -7,1010705 or 30,9529832,-7,1010705, match1=30,9529832 and match2=-7,1010705
        elif re.match(r"\d+,\d+,\s?-\d+,\d+", latlng):
            d1, d2, d3, d4 = latlng.split(",")
            return [float(".".join([d1, d2])), float(".".join([d3, d4]))]
    except Exception as e:
        print(f"Error parsing latlng: {latlng}  Reason: {e}")
        return None
    print(f"Error parsing latlng: {latlng}")
    return None

def add_epicentre_to_map(map_obj):
    # Removed the spinner to not confuse the users as the map is already loaded
    icon_epicentre = folium.plugins.BeautifyIcon(
        icon='star',
        border_color='#b3334f',
        background_color='#b3334f',
        text_color='white'
    )
    folium.Marker(location=EPICENTER_LOCATION, 
                  popup="Epicenter مركز الزلزال", 
                  icon=icon_epicentre).add_to(map_obj)


def add_danger_distances_to_map(map_obj):
    Danger_Distances_group = folium.FeatureGroup(name='Danger distances - earthquake magnitude 7 | مسافات الخطر - قوة الزلازل 7').add_to(map_obj)
    
    zones = [
        {"radius": 100000, "fill_opacity": 0.1, "weight": 1, "fill_color": "yellow", "tooltip": "50 to 100 km - Moderate risk area | منطقة خطر معتدلة"},
        {"radius": 50000, "fill_opacity": 0.1, "weight": 1, "fill_color": "orange", "tooltip": "30 to 50 km - High risk zone | منطقة عالية المخاطر"},
        {"radius": 30000, "fill_opacity": 0.2, "weight": 1, "fill_color": "#FF0000", "tooltip": "10 to 30 km - Very high risk zone | منطقة شديدة الخطورة"},
        {"radius": 10000, "fill_opacity": 0.2, "weight": 0.2, "fill_color": "#8B0000", "tooltip": "0 to 10km - direct impact zone | منطقة التأثير المباشر"}
    ]

    for zone in zones:
        folium.Circle(
            location=EPICENTER_LOCATION,
            radius=zone["radius"],
            color=BORDER_COLOR,
            weight=zone["weight"],
            fill_opacity=zone["fill_opacity"],
            opacity=zone["fill_opacity"],  # Assuming border opacity should match fill_opacity
            fill_color=zone["fill_color"],
            tooltip=zone["tooltip"],
        ).add_to(Danger_Distances_group)


def init_map():
    m = folium.Map(
        location=[31.228674, -7.992047],
        zoom_start=8.5,
        min_zoom=8.5,
        max_lat=35.628674,
        min_lat=29.628674,
        max_lon=-4.992047,
        min_lon=-10.992047,
        max_bounds=True,
    )
    # Add a search bar to the map
    plugins.Geocoder(
        collapsed=False,
        position="topright",
        placeholder="Search | البحث",
    ).add_to(m)

    # Add Fullscreen button to the map
    plugins.Fullscreen(
        position="topright",
        title="Expand me | تكبير الخريطة",
        title_cancel="Exit me | تصغير الخريطة",
        force_separate_button=True,
    ).add_to(m)

    # Satellite View from Mapbox
    tileurl = "https://marocmap.ikiker.com/maroc/{z}/{x}/{y}.png"
    folium.TileLayer(
        tiles=tileurl,
        attr="Maroc Map",
        name="Maroc Map",
        overlay=False,
        control=False,
    ).add_to(m)

    # Add danger zones
    add_epicentre_to_map(m)
    add_danger_distances_to_map(m)

    # Add a LayerControl to the map to toggle between layers (Satellite View and Default One)
    folium.LayerControl().add_to(m)

    # Macro to add legend
    m.get_root().add_child(legend_macro)
    return m