import wx
from tilemanager import TileCoord

class MapCoord:
    def __init__(self, lat, lon, zoom):
        self.lat = lat
        self.lon = lon
        self.zoom = zoom

class MapManager:
    def __init__(self, tilemanager):
        self.tilemanager = tilemanager
        
        # The center of the map
        self.mappos = MapCoord(0.0, 0.0, 4.0)
    
    def tilecoords(self, lat, lon, zoom):
        '''Return the tile x and y positions as floats'''
        return 0., 0.
    
    def integerzoom(self):
        '''Choose the largest integer zoom level available at origo that is below/equal to the float'''
        sorted = list(self.tilemanager.zoomlevels)
        sorted.sort(reverse = True) # Largest first
        
        for zoomlevel in sorted:
            # It's better to scale up than down
            if zoomlevel > self.mappos.zoom:
                continue
            
            tilex, tiley = self.tilecoords(self.mappos.lat, self.mappos.lon, zoomlevel)
            if self.tilemanager.has_tile(TileCoord(tilex, tiley, zoomlevel)):
                return zoomlevel
        else:
            return 1
    
    def makemap(self, width, height):
        izoom = self.integerzoom()
        zoomratio = (2 ** self.mappos.zoom) / (2 ** izoom)
        
        canvas = wx.EmptyImage(width * zoomratio, height * zoomratio)
        
        return canvas.scale(width, height)