# Copyright (C) 2010 Google Inc. All rights reserved.

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import logging

import urllib

from google.appengine.api import users

from google.appengine.ext import blobstore

from google.appengine.ext import webapp

from google.appengine.ext.webapp import blobstore_handlers

from google.appengine.ext.webapp import template

from model.testfile import TestFile

PARAM_BUILDER = "builder"

PARAM_DIR = "dir"

PARAM_FILE = "file"

PARAM_NAME = "name"

PARAM_KEY = "key"

PARAM_TEST_TYPE = "testtype"

class DeleteFile(webapp.RequestHandler):

    """Delete test file for a given builder and name from datastore (metadata) and blobstore (file data)."""

    def get(self):

        key = self.request.get(PARAM_KEY)

        builder = self.request.get(PARAM_BUILDER)

        test_type = self.request.get(PARAM_TEST_TYPE)

        name = self.request.get(PARAM_NAME)

        logging.debug(

            "Deleting File, builder: %s, test_type: %s, name: %s, blob key: %s.",

            builder, test_type, name, key)

        TestFile.delete_file(key, builder, test_type, name, 100)

        # Display file list after deleting the file.

        self.redirect("/testfile?builder=%s&testtype=%s&name=%s"

            % (builder, test_type, name))

class GetFile(blobstore_handlers.BlobstoreDownloadHandler):

    """Get file content or list of files for given builder and name."""

    def _get_file_list(self, builder, test_type, name):

        """Get and display a list of files that matches builder and file name.

        Args:

            builder: builder name

            test_type: type of the test

            name: file name

        """

        files = TestFile.get_files(builder, test_type, name, 100)

        if not files:

            logging.info("File not found, builder: %s, test_type: %s, name: %s.",

                         builder, test_type, name)

            self.response.out.write("File not found")

            return

        template_values = {

            "admin": users.is_current_user_admin(),

            "builder": builder,

            "test_type": test_type,

            "name": name,

            "files": files,

        }

        self.response.out.write(template.render("templates/showfilelist.html",

                                                template_values))

    def _get_file_content(self, builder, test_type, name):

        """Return content of the file that matches builder and file name.

        Args:

            builder: builder name

            test_type: type of the test

            name: file name

        """

        files = TestFile.get_files(builder, test_type, name, 1)

        if not files:

            logging.info("File not found, builder: %s, test_type: %s, name: %s.",

                         builder, test_type, name)

            return

        blob_key = files[0].blob_key

        blob_info = blobstore.get(blob_key)

        if blob_info:

            self.send_blob(blob_info, "text/plain")

    def get(self):

        builder = self.request.get(PARAM_BUILDER)

        test_type = self.request.get(PARAM_TEST_TYPE)

        name = self.request.get(PARAM_NAME)

        dir = self.request.get(PARAM_DIR)

        logging.debug(

            "Getting files, builder: %s, test_type: %s, name: %s.",

            builder, test_type, name)

        # If parameter "dir" is specified or there is no builder or filename

        # specified in the request, return list of files, otherwise, return

        # file content.

        if dir or not builder or not name:

            return self._get_file_list(builder, test_type, name)

        else:

            return self._get_file_content(builder, test_type, name)

class GetUploadUrl(webapp.RequestHandler):

    """Get an url for uploading file to blobstore. A special url is required for each blobsotre upload."""

    def get(self):

        upload_url = blobstore.create_upload_url("/testfile/upload")

        logging.info("Getting upload url: %s.", upload_url)

        self.response.out.write(upload_url)

class Upload(blobstore_handlers.BlobstoreUploadHandler):

    """Upload file to blobstore."""

    def post(self):

        uploaded_files = self.get_uploads("file")

        if not uploaded_files:

            return self._upload_done([("Missing upload file field.")])

        builder = self.request.get(PARAM_BUILDER)

        if not builder:

            for blob_info in uploaded_files:

                blob_info.delete()

            return self._upload_done([("Missing builder parameter in upload request.")])

        test_type = self.request.get(PARAM_TEST_TYPE)

        logging.debug(

            "Processing upload request, builder: %s, test_type: %s.",

            builder, test_type)

        errors = []

        for blob_info in uploaded_files:

            tf = TestFile.update_file(builder, test_type, blob_info)

            if not tf:

                errors.append(

                    "Upload failed, builder: %s, test_type: %s, name: %s." %

                    (builder, test_type, blob_info.filename))

                blob_info.delete()

        return self._upload_done(errors)

    def _upload_done(self, errors):

        logging.info("upload done.")

        error_messages = []

        for error in errors:

            logging.info(error)

            error_messages.append("error=%s" % urllib.quote(error))

        if error_messages:

            redirect_url = "/uploadfail?%s" % "&".join(error_messages)

        else:

            redirect_url = "/uploadsuccess"

        logging.info(redirect_url)

        # BlobstoreUploadHandler requires redirect at the end.

        self.redirect(redirect_url)

class UploadForm(webapp.RequestHandler):

    """Show a form so user can submit a file to blobstore."""

    def get(self):

        upload_url = blobstore.create_upload_url("/testfile/upload")

        template_values = {

            "upload_url": upload_url,

        }

        self.response.out.write(template.render("templates/uploadform.html",

                                                template_values))

class UploadStatus(webapp.RequestHandler):

    """Return status of file uploading"""

    def get(self):

        logging.debug("Update status")

        if self.request.path == "/uploadsuccess":

            self.response.set_status(200)

            self.response.out.write("OK")

        else:

            errors = self.request.params.getall("error")

            if errors:

                messages = "FAIL: " + "; ".join(errors)

                logging.warning(messages)

                self.response.set_status(500, messages)

                self.response.out.write("FAIL")