import pandas

import folium

map = folium.Map(location=[39.11,-98.08], zoom_start=3, tiles = "Stamen Terrain") #this creates the base layer for the map

fg = folium.FeatureGroup(Name='My Map')#this is a way to keep your code organized because you can keep loading in features into a feature group.

#this is a base layer

######BEGINNING OF THE SECOND LAYER OF THE MAP -- THE VOLCANO MARKERS

fgv = folium.FeatureGroup(Name="Volcanos") #Creating a new feature group layer

volcanos = pandas.read_csv("course/section17map/volcanos.csv") #reading data on the USA volcanos

lat = list(volcanos["LAT"])#just taking the data from the LAT column and putting it into a native python list for use in a for loop

lon = list(volcanos["LON"])

elev = list(volcanos["ELEV"])

nam = list(volcanos["NAME"])

voltype = list(volcanos["TYPE"])

status = list(volcanos["STATUS"])

####Style points here

html = """

Volcano name:<a href="https://www.google.com/search?q=%%22%s%%22" target="_blank">%s</a><br>

Height: %s m

""" #need to reveiw html code

#<br> is a break

def colorproducer(el): #this is function that returns a differnet value depending on the elevation data in that element. Will run inside the for loop.

return 'blue'

for la, lo, el, name in zip(lat, lon, elev, nam): #when iterating through two lists you have to use the zip function

iframe = folium.IFrame(html=html % (name, name, el), width=200, height=100) #this iframe is used to load in an iframe that sets the visual aspects of the marker

fgv.add_child(folium.CircleMarker(location=[la,lo], popup=folium.Popup(iframe), fill_color=colorproducer(el), color='grey', fill_opacity='0.7'))#this is considered a "Child" of the map object. This is making a market on the map.

#######BEGINNING OF THE THIRD LAYER ON THE MAP - THE COUNTRY POLYGONS

fgp = folium.FeatureGroup(Name="Populations")

fgp.add_child(folium.GeoJson(data=open('course/section17map/world.json', 'r', encoding='utf-8-sig').read(), #This line of code is loading in the polygons #'r' is for read mode

#need encoding...research why...it was suggested by the error message

#new folium requires string input not a file so we use a .read() at the end of the open statement to get this

style_function = lambda x: {'fillColor':'yellow' if x['properties']['POP2005'] <=50000000 else #using a lambda functon to stylize. lambda is a unnamed function which works great for small tasks in code.

'orange' if x['properties']['POP2005'] <100000000

else 'purple' if x['properties']['POP2005'] <2000000

else 'blue' if x['properties']['POP2005'] <1000000000

else 'black'}))

#what it is going is running through every single part of the dictionary, where each country is its own dictionary that has data attached and saying in "properties"

#if the population is less than XXXX than change the fillColor to ''

map.add_child(fgp)

map.add_child(fgv)

map.add_child(fg)

map.add_child(folium.LayerControl())#layer control has to be added after the feature group

map.save("course/section17map/ImTheMap.html") #creates a file or overwrites existing html file