#!/usr/bin/python3
# -*- coding: utf-8 -*-
# Copyright (c) 2016  Red Hat, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# Written by Petr Šabata <contyk@redhat.com>
#            Matt Prahl <mprahl@redhat.com>

""" The module build orchestrator for Modularity, API.
This is the implementation of the orchestrator's public RESTful API.
"""

from flask import request, jsonify
from flask.views import MethodView
import json
import logging
import modulemd
import os
import rida.auth
import rida.logger
import rida.scm
import shutil
import tempfile
from rida import app, conf, db, log
from rida import models
from rida.utils import pagination_metadata, filter_module_builds
from rida.errors import (
    ValidationError, Unauthorized, UnprocessableEntity, Conflict, NotFound)


class ModuleBuildAPI(MethodView):

    def get(self, id):
        if id is None:
            # Lists all tracked module builds
            p_query = filter_module_builds(request)

            json_data = {
                'meta': pagination_metadata(p_query)
            }

            verbose_flag = request.args.get('verbose', 'false')

            if verbose_flag.lower() == 'true' or verbose_flag == '1':
                json_data['items'] = [item.api_json() for item in p_query.items]
            else:
                json_data['items'] = [{'id': item.id, 'state': item.state} for
                                      item in p_query.items]

            return jsonify(json_data), 200
        else:
            # Lists details for the specified module builds
            module = models.ModuleBuild.query.filter_by(id=id).first()

            if module:
                return jsonify(module.api_json()), 200
            else:
                raise NotFound('No such module found.')

    def post(self):
        username = rida.auth.get_username(request.environ)
        rida.auth.assert_is_packager(username, fas_kwargs=dict(
            base_url=conf.fas_url,
            username=conf.fas_username,
            password=conf.fas_password))

        try:
            r = json.loads(request.get_data().decode("utf-8"))
        except:
            raise ValidationError('Invalid JSON submitted')

        if "scmurl" not in r:
            raise ValidationError('Missing scmurl')

        url = r["scmurl"]
        if not any(url.startswith(prefix) for prefix in conf.scmurls):
            raise Unauthorized("The submitted scmurl is not allowed")

        yaml = ""
        td = None
        try:
            td = tempfile.mkdtemp()
            scm = rida.scm.SCM(url, conf.scmurls)
            cod = scm.checkout(td)
            cofn = os.path.join(cod, (scm.name + ".yaml"))

            with open(cofn, "r") as mmdfile:
                yaml = mmdfile.read()
        finally:
            try:
                if td is not None:
                    shutil.rmtree(td)
            except Exception as e:
                log.warning(
                    "Failed to remove temporary directory {!r}: {}".format(
                        td, str(e)))

        mmd = modulemd.ModuleMetadata()
        try:
            mmd.loads(yaml)
        except:
            raise UnprocessableEntity('Invalid modulemd')

        if models.ModuleBuild.query.filter_by(name=mmd.name,
                                              version=mmd.version,
                                              release=mmd.release).first():
            raise Conflict('Module already exists')

        module = models.ModuleBuild.create(
            db.session,
            conf,
            name=mmd.name,
            version=mmd.version,
            release=mmd.release,
            modulemd=yaml,
            scmurl=url,
            username=username
        )

        for pkgname, pkg in mmd.components.rpms.packages.items():
            try:
                if pkg.get("repository") and not conf.rpms_allow_repository:
                    raise Unauthorized(
                        "Custom component repositories aren't allowed")
                if pkg.get("cache") and not conf.rpms_allow_cache:
                    raise Unauthorized("Custom component caches aren't allowed")
                if not pkg.get("repository"):
                    pkg["repository"] = conf.rpms_default_repository + pkgname
                if not pkg.get("cache"):
                    pkg["cache"] = conf.rpms_default_cache + pkgname
                if not pkg.get("commit"):
                    try:
                        pkg["commit"] = rida.scm.SCM(
                            pkg["repository"]).get_latest()
                    except Exception as e:
                        raise UnprocessableEntity(
                            "Failed to get the latest commit: %s" % pkgname)
            except Exception:
                module.transition(conf, models.BUILD_STATES["failed"])
                db.session.add(module)
                db.session.commit()
                raise

            full_url = pkg["repository"] + "?#" + pkg["commit"]

            if not rida.scm.SCM(full_url).is_available():
                raise UnprocessableEntity("Cannot checkout %s" % pkgname)

            build = models.ComponentBuild(
                module_id=module.id,
                package=pkgname,
                format="rpms",
                scmurl=full_url,
            )
            db.session.add(build)

        module.modulemd = mmd.dumps()
        module.transition(conf, models.BUILD_STATES["wait"])
        db.session.add(module)
        db.session.commit()
        logging.info("%s submitted build of %s-%s-%s", username, mmd.name,
                     mmd.version, mmd.release)
        return jsonify(module.json()), 201


def register_v1_api():
    """ Registers version 1 of Rida API. """
    module_view = ModuleBuildAPI.as_view('module_builds')
    app.add_url_rule('/rida/1/module-builds/', defaults={'id': None},
                     view_func=module_view, methods=['GET'])
    app.add_url_rule('/rida/1/module-builds/', view_func=module_view,
                     methods=['POST'])
    app.add_url_rule('/rida/1/module-builds/<int:id>', view_func=module_view,
                     methods=['GET'])

register_v1_api()