# ====================== BEGIN GPL LICENSE BLOCK ======================
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 3
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# ======================= END GPL LICENSE BLOCK ========================

import bpy
import addon_utils
import json
import urllib.request
import logging
import shutil
from bpy.props import StringProperty

logging.basicConfig(format='%(asctime)-15s %(levelname)8s %(name)s %(message)s',
                    level=logging.INFO)
log = logging.getLogger('networking')

class WM_OT_update_index(bpy.types.Operator):
    """Check for updated list of add-ons available for download"""
    bl_idname = "wm.update_index"
    bl_label = "Check for updated list of add-ons"

    def execute(self, context):
        # Download the index.json file
        try:
            req = urllib.request.urlopen("https://git.blender.org/gitweb/gitweb.cgi/"
                "blender-package-manager-addon.git/blob_plain/HEAD:/addons/index.json")
            index_file = req.read().decode('utf-8')
            req.close()
        except urllib.error.HTTPError as err:
            self.report({'ERROR'}, "Error requesting update: "
                + str(err.code) + " " + err.reason)
            return {'CANCELLED'}
        
        # Parse downloaded file
        try:
            addon_list = json.loads(index_file)
        except ValueError as err:
            self.report({'ERROR'}, "Error: JSON file could not parse.")
            log.warning("ValueError: %s", err)
            return {'CANCELLED'}
        
        # Get the add-on preferences
        prefs = bpy.context.user_preferences.addons.get("package_manager").preferences
            
        # Clear previous list of add-ons
        prefs.pm_addons.clear()
        prefs.pm_addons_index = 0
        
        user_path = bpy.utils.user_resource('SCRIPTS', path="addons")
        installed = addon_utils.modules()
        
        # Loop through every add-on in the parsed json
        for name, content in addon_list["addons"].items():
            # Skip add-ons not installed to USER directory
            # TODO: support above later
            for a in installed:
                if name == a.__name__ and user_path not in a.__file__:
                    log.warning("Not listing add-on %s, as it is installed to "
                                "location other than USER path", name)
                    break
            else:
                # Add new add-on to the list
                addon = prefs.pm_addons.add()

                self.load_addon_data(addon, name, content)
        
        return {'FINISHED'}
    
    def load_addon_data(self, addon, module_name, content):
        addon.name = content["name"]
        addon.blender = '.'.join(map(str, content["blender"]))
        addon.module_name = module_name
        
        if "author" in content:
            addon.author = content["author"]
        
        if "category" in content:
            addon.category = content["category"]
        
        if "description" in content:
            addon.description = content["description"]
        
        if "filename" in content:
            addon.filename = content["filename"]
        
        if "location" in content:
            addon.location = content["location"]
        
        if "source" in content:
            addon.source = content["source"]
        
        if "support" in content:
            addon.support = content["support"]
        
        if "tracker_url" in content:
            addon.tracker_url = content["tracker_url"]
        
        if "version" in content:
            # TODO: add multi-version functionality
            addon.version = '.'.join(map(str, content["version"]))
        
        if "wiki_url" in content:
            addon.wiki_url = content["wiki_url"]
        
        if "warning" in content:
            addon.warning = content["warning"]


class WM_OT_addon_download_install(bpy.types.Operator):
    """Download and install add-on"""
    bl_idname = "wm.addon_download_install"
    bl_label = "Download and install selected add-on"
    
    addon = bpy.props.StringProperty()

    def execute(self, context):
        if self.addon is None:
            return {'CANCELLED'}
        
        # Get the add-on preferences
        prefs = bpy.context.user_preferences.addons.get("package_manager").preferences
        for addon in prefs.pm_addons:
            if addon.module_name == self.addon:
                break
        else:
            print("failed :(")
            return {'CANCELLED'}
        
        # TODO: specify filetype
        
        if self.download(self.addon):
            if self.install(self.addon):
                return {'FINISHED'}
        
        return {'CANCELLED'}
    
    def download(self, addon, filetype=".py"):
        filename = addon + filetype
        
        download_path = bpy.utils.user_resource('SCRIPTS',
            path="addons/package_manager/download%s" % filetype)
        
        try:
            req = urllib.request.urlopen("http://localhost:8000/%s" % filename)
            with open(download_path, 'wb') as download_file:
                shutil.copyfileobj(req, download_file)
            req.close()
        except urllib.error.HTTPError as err:
            log.warning("Download failed with HTTPError: %s %s",
                        str(err.code), err.reason)
            return False
        
        return True

    def install(self, addon, filetype=".py"):
        filename = addon + filetype if filetype == ".py" else ""
        
        download_path = bpy.utils.user_resource('SCRIPTS',
            path="addons/package_manager/download%s" % filetype)
        addon_path = bpy.utils.user_resource('SCRIPTS', path="addons/%s" % filename)
        
        if filetype == ".py":
            shutil.move(download_path, addon_path)
        
        return True


def register():
    bpy.utils.register_class(WM_OT_update_index)
    bpy.utils.register_class(WM_OT_addon_download_install)

def unregister():
    bpy.utils.unregister_class(WM_OT_update_index)
    bpy.utils.unregister_class(WM_OT_addon_download_install)