from django import http
from django.shortcuts import render, redirect

from qmsk.pngtile import pngtile

import pypngtile

import json
import os.path

def index (request, name):
    store = pngtile.STORE

    try:
        tree  = store.tree(name)
        items = store.items(name)
    except pngtile.NotFound:
        raise http.Http404
    except pngtile.InvalidImage:
        return http.HttpResponseBadRequest(name)
    except pngtile.UncachedImage:
        return http.HttpResponseBadRequest(name)
    except pngtile.Error as error:
        return http.HttpResponseServerError(str(error))
    except pypngtile.Error as error:
        return http.HttpResponseServerError(str(error))
    
    return render(request, 'qmsk.pngtile/index.html', dict(
        site_name   = u"...",
        name        = name,
        title       = store.title(name),
        breadcrumb  = store.breadcrumb(name),
        tree        = tree,
        index_items = sorted(items),
    ))

def image (request, name):
    store = pngtile.STORE

    try:
        image, name = store.open(name)
        tree  = store.tree(os.path.dirname(name))
    except pngtile.NotFound:
        raise http.Http404
    except pngtile.InvalidImage:
        return http.HttpResponseBadRequest(name)
    except pngtile.UncachedImage:
        return http.HttpResponseBadRequest(name)
    except pngtile.Error as error:
        return http.HttpResponseServerError(str(error))
    except pypngtile.Error as error:
        return http.HttpResponseServerError(str(error))

    image_info = image.info()

    map_config = dict(
        tiles_url       = store.tiles_url(name),
        tiles_mtime     = 0,

        tile_url        = '{tiles_url}?t={tiles_mtime}&x={x}&y={y}&zoom={z}',
        tile_size       = store.TILE_SIZE,
        tile_zoom       = store.TILE_ZOOM,

        image_url       = '{tiles_url}?w={w}&h={h}&x={x}&y={y}&zoom={z}',
        image_width     = image_info['img_width'],
        image_height    = image_info['img_height'],
    )
    
    return render(request, 'qmsk.pngtile/image.html', dict(
        site_name   = u"...",
        name        = name,
        title       = store.title(name),
        breadcrumb  = store.breadcrumb(name),
        tree        = tree,
        map_config  = json.dumps(map_config),
    ))