# Content DB
# Copyright (C) 2018  rubenwardy
#
# 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 <https://www.gnu.org/licenses/>.


from flask import render_template, abort, request, redirect, url_for, flash
from flask_user import current_user
import flask_menu as menu

from . import bp

from app.models import *
from app.querybuilder import QueryBuilder
from app.tasks.importtasks import importRepoScreenshot
from app.utils import *

from flask_wtf import FlaskForm
from wtforms import *
from wtforms.validators import *
from wtforms.ext.sqlalchemy.fields import QuerySelectField, QuerySelectMultipleField
from sqlalchemy import or_, func
from sqlalchemy.orm import joinedload, subqueryload


@menu.register_menu(bp, ".mods", "Mods", order=11, endpoint_arguments_constructor=lambda: { 'type': 'mod' })
@menu.register_menu(bp, ".games", "Games", order=12, endpoint_arguments_constructor=lambda: { 'type': 'game' })
@menu.register_menu(bp, ".txp", "Texture Packs", order=13, endpoint_arguments_constructor=lambda: { 'type': 'txp' })
@menu.register_menu(bp, ".random", "Random", order=14, endpoint_arguments_constructor=lambda: { 'random': '1', 'lucky': '1' })
@bp.route("/packages/")
def list_all():
	qb    = QueryBuilder(request.args)
	query = qb.buildPackageQuery()
	title = qb.title

	query = query.options( \
			joinedload(Package.license), \
			joinedload(Package.media_license), \
			subqueryload(Package.tags))

	if qb.lucky:
		package = query.first()
		if package:
			return redirect(package.getDetailsURL())

		topic = qb.buildTopicQuery().first()
		if qb.search and topic:
			return redirect("https://forum.minetest.net/viewtopic.php?t=" + str(topic.topic_id))

	page  = get_int_or_abort(request.args.get("page"), 1)
	num   = min(40, get_int_or_abort(request.args.get("n"), 100))
	query = query.paginate(page, num, True)

	search = request.args.get("q")
	type_name = request.args.get("type")

	next_url = url_for("packages.list_all", type=type_name, q=search, page=query.next_num) \
			if query.has_next else None
	prev_url = url_for("packages.list_all", type=type_name, q=search, page=query.prev_num) \
			if query.has_prev else None

	authors = []
	if search:
		authors = User.query \
			.filter(or_(*[func.lower(User.username) == name.lower().strip() for name in search.split(" ")])) \
			.all()

		authors = [(author.username, search.lower().replace(author.username.lower(), "")) for author in authors]

	topics = None
	if qb.search and not query.has_next:
		qb.show_discarded = True
		topics = qb.buildTopicQuery().all()

	tags = Tag.query.all()
	return render_template("packages/list.html", \
			title=title, packages=query.items, topics=topics, \
			query=search, tags=tags, type=type_name, \
			authors = authors, \
			next_url=next_url, prev_url=prev_url, page=page, page_max=query.pages, packages_count=query.total)


def getReleases(package):
	if package.checkPerm(current_user, Permission.MAKE_RELEASE):
		return package.releases.limit(5)
	else:
		return package.releases.filter_by(approved=True).limit(5)


@bp.route("/packages/<author>/<name>/")
@is_package_page
def view(package):
	clearNotifications(package.getDetailsURL())

	alternatives = None
	if package.type == PackageType.MOD:
		alternatives = Package.query \
			.filter_by(name=package.name, type=PackageType.MOD, soft_deleted=False) \
			.filter(Package.id != package.id) \
			.order_by(db.desc(Package.score)) \
			.all()


	show_similar_topics = current_user == package.author or \
			package.checkPerm(current_user, Permission.APPROVE_NEW)

	similar_topics = None if not show_similar_topics else \
			ForumTopic.query \
				.filter_by(name=package.name) \
				.filter(ForumTopic.topic_id != package.forums) \
				.filter(~ db.exists().where(Package.forums==ForumTopic.topic_id)) \
				.order_by(db.asc(ForumTopic.name), db.asc(ForumTopic.title)) \
				.all()

	releases = getReleases(package)
	requests = [r for r in package.requests if r.status == 0]

	review_thread = package.review_thread
	if review_thread is not None and not review_thread.checkPerm(current_user, Permission.SEE_THREAD):
		review_thread = None

	topic_error = None
	topic_error_lvl = "warning"
	if not package.approved and package.forums is not None:
		errors = []
		if Package.query.filter_by(forums=package.forums, soft_deleted=False).count() > 1:
			errors.append("<b>Error: Another package already uses this forum topic!</b>")
			topic_error_lvl = "danger"

		topic = ForumTopic.query.get(package.forums)
		if topic is not None:
			if topic.author != package.author:
				errors.append("<b>Error: Forum topic author doesn't match package author.</b>")
				topic_error_lvl = "danger"

			if topic.wip:
				errors.append("Warning: Forum topic is in WIP section, make sure package meets playability standards.")
		elif package.type != PackageType.TXP:
			errors.append("Warning: Forum topic not found. This may happen if the topic has only just been created.")

		topic_error = "<br />".join(errors)


	threads = Thread.query.filter_by(package_id=package.id)
	if not current_user.is_authenticated:
		threads = threads.filter_by(private=False)
	elif not current_user.rank.atLeast(UserRank.EDITOR) and not current_user == package.author:
		threads = threads.filter(or_(Thread.private == False, Thread.author == current_user))


	return render_template("packages/view.html", \
			package=package, releases=releases, requests=requests, \
			alternatives=alternatives, similar_topics=similar_topics, \
			review_thread=review_thread, topic_error=topic_error, topic_error_lvl=topic_error_lvl, \
			threads=threads.all())


@bp.route("/packages/<author>/<name>/download/")
@is_package_page
def download(package):
	release = package.getDownloadRelease()

	if release is None:
		if "application/zip" in request.accept_mimetypes and \
				not "text/html" in request.accept_mimetypes:
			return "", 204
		else:
			flash("No download available.", "danger")
			return redirect(package.getDetailsURL())
	else:
		return redirect(release.getDownloadURL(), code=302)


class PackageForm(FlaskForm):
	name          = StringField("Name (Technical)", [InputRequired(), Length(1, 100), Regexp("^[a-z0-9_]+$", 0, "Lower case letters (a-z), digits (0-9), and underscores (_) only")])
	title         = StringField("Title (Human-readable)", [InputRequired(), Length(3, 100)])
	short_desc     = StringField("Short Description (Plaintext)", [InputRequired(), Length(1,200)])
	desc          = TextAreaField("Long Description (Markdown)", [Optional(), Length(0,10000)])
	type          = SelectField("Type", [InputRequired()], choices=PackageType.choices(), coerce=PackageType.coerce, default=PackageType.MOD)
	license       = QuerySelectField("License", [DataRequired()], allow_blank=True, query_factory=lambda: License.query.order_by(db.asc(License.name)), get_pk=lambda a: a.id, get_label=lambda a: a.name)
	media_license = QuerySelectField("Media License", [DataRequired()], allow_blank=True, query_factory=lambda: License.query.order_by(db.asc(License.name)), get_pk=lambda a: a.id, get_label=lambda a: a.name)
	provides_str  = StringField("Provides (mods included in package)", [Optional()])
	tags          = QuerySelectMultipleField('Tags', query_factory=lambda: Tag.query.order_by(db.asc(Tag.name)), get_pk=lambda a: a.id, get_label=lambda a: a.title)
	harddep_str   = StringField("Hard Dependencies", [Optional()])
	softdep_str   = StringField("Soft Dependencies", [Optional()])
	repo          = StringField("VCS Repository URL", [Optional(), URL()], filters = [lambda x: x or None])
	website       = StringField("Website URL", [Optional(), URL()], filters = [lambda x: x or None])
	issueTracker  = StringField("Issue Tracker URL", [Optional(), URL()], filters = [lambda x: x or None])
	forums	      = IntegerField("Forum Topic ID", [Optional(), NumberRange(0,999999)])
	submit	      = SubmitField("Save")

@bp.route("/packages/new/", methods=["GET", "POST"])
@bp.route("/packages/<author>/<name>/edit/", methods=["GET", "POST"])
@login_required
def create_edit(author=None, name=None):
	package = None
	form = None
	if author is None:
		form = PackageForm(formdata=request.form)
		author = request.args.get("author")
		if author is None or author == current_user.username:
			author = current_user
		else:
			author = User.query.filter_by(username=author).first()
			if author is None:
				flash("Unable to find that user", "danger")
				return redirect(url_for("packages.create_edit"))

			if not author.checkPerm(current_user, Permission.CHANGE_AUTHOR):
				flash("Permission denied", "danger")
				return redirect(url_for("packages.create_edit"))

	else:
		package = getPackageByInfo(author, name)
		if not package.checkPerm(current_user, Permission.EDIT_PACKAGE):
			return redirect(package.getDetailsURL())

		author = package.author

		form = PackageForm(formdata=request.form, obj=package)

	# Initial form class from post data and default data
	if request.method == "GET":
		if package is None:
			form.name.data   = request.args.get("bname")
			form.title.data  = request.args.get("title")
			form.repo.data   = request.args.get("repo")
			form.forums.data = request.args.get("forums")
			form.license.data = None
			form.media_license.data = None
		else:
			form.harddep_str.data  = ",".join([str(x) for x in package.getSortedHardDependencies() ])
			form.softdep_str.data  = ",".join([str(x) for x in package.getSortedOptionalDependencies() ])
			form.provides_str.data = MetaPackage.ListToSpec(package.provides)

	if request.method == "POST" and form.validate():
		wasNew = False
		if not package:
			package = Package.query.filter_by(name=form["name"].data, author_id=author.id).first()
			if package is not None:
				if package.soft_deleted:
					Package.query.filter_by(name=form["name"].data, author_id=author.id).delete()
				else:
					flash("Package already exists!", "danger")
					return redirect(url_for("packages.create_edit"))

			package = Package()
			package.author = author
			wasNew = True

		elif package.approved and package.name != form.name.data and \
				not package.checkPerm(current_user, Permission.CHANGE_NAME):
			flash("Unable to change package name", "danger")
			return redirect(url_for("packages.create_edit", author=author, name=name))

		else:
			triggerNotif(package.author, current_user,
					"{} edited".format(package.title), package.getDetailsURL())

		form.populate_obj(package) # copy to row

		if package.type== PackageType.TXP:
			package.license = package.media_license

		mpackage_cache = {}
		package.provides.clear()
		mpackages = MetaPackage.SpecToList(form.provides_str.data, mpackage_cache)
		for m in mpackages:
			package.provides.append(m)

		Dependency.query.filter_by(depender=package).delete()
		deps = Dependency.SpecToList(package, form.harddep_str.data, mpackage_cache)
		for dep in deps:
			dep.optional = False
			db.session.add(dep)

		deps = Dependency.SpecToList(package, form.softdep_str.data, mpackage_cache)
		for dep in deps:
			dep.optional = True
			db.session.add(dep)

		if wasNew and package.type == PackageType.MOD and not package.name in mpackage_cache:
			m = MetaPackage.GetOrCreate(package.name, mpackage_cache)
			package.provides.append(m)

		package.tags.clear()
		for tag in form.tags.raw_data:
			package.tags.append(Tag.query.get(tag))

		db.session.commit() # save

		next_url = package.getDetailsURL()
		if wasNew and package.repo is not None:
			task = importRepoScreenshot.delay(package.id)
			next_url = url_for("tasks.check", id=task.id, r=next_url)

		if wasNew and ("WTFPL" in package.license.name or "WTFPL" in package.media_license.name):
			next_url = url_for("flatpage", path="help/wtfpl", r=next_url)

		return redirect(next_url)

	package_query = Package.query.filter_by(approved=True, soft_deleted=False)
	if package is not None:
		package_query = package_query.filter(Package.id != package.id)

	enableWizard = name is None and request.method != "POST"
	return render_template("packages/create_edit.html", package=package, \
			form=form, author=author, enable_wizard=enableWizard, \
			packages=package_query.all(), \
			mpackages=MetaPackage.query.order_by(db.asc(MetaPackage.name)).all())

@bp.route("/packages/<author>/<name>/approve/", methods=["POST"])
@login_required
@is_package_page
def approve(package):
	if not package.checkPerm(current_user, Permission.APPROVE_NEW):
		flash("You don't have permission to do that.", "danger")

	elif package.approved:
		flash("Package has already been approved", "danger")

	else:
		package.approved = True

		screenshots = PackageScreenshot.query.filter_by(package=package, approved=False).all()
		for s in screenshots:
			s.approved = True

		triggerNotif(package.author, current_user,
				"{} approved".format(package.title), package.getDetailsURL())
		db.session.commit()

	return redirect(package.getDetailsURL())


@bp.route("/packages/<author>/<name>/remove/", methods=["GET", "POST"])
@login_required
@is_package_page
def remove(package):
	if request.method == "GET":
		return render_template("packages/remove.html", package=package)

	if "delete" in request.form:
		if not package.checkPerm(current_user, Permission.DELETE_PACKAGE):
			flash("You don't have permission to do that.", "danger")
			return redirect(package.getDetailsURL())

		package.soft_deleted = True

		url = url_for("users.profile", username=package.author.username)
		triggerNotif(package.author, current_user,
				"{} deleted".format(package.title), url)
		db.session.commit()

		flash("Deleted package", "success")

		return redirect(url)
	elif "unapprove" in request.form:
		if not package.checkPerm(current_user, Permission.UNAPPROVE_PACKAGE):
			flash("You don't have permission to do that.", "danger")
			return redirect(package.getDetailsURL())

		package.approved = False

		triggerNotif(package.author, current_user,
				"{} unapproved".format(package.title), package.getDetailsURL())
		db.session.commit()

		flash("Unapproved package", "success")

		return redirect(package.getDetailsURL())
	else:
		abort(400)



class PackageMaintainersForm(FlaskForm):
	maintainers_str  = StringField("Maintainers (Comma-separated)", [Optional()])
	submit	      = SubmitField("Save")


@bp.route("/packages/<author>/<name>/edit-maintainers/", methods=["GET", "POST"])
@login_required
@is_package_page
def edit_maintainers(package):
	if not package.checkPerm(current_user, Permission.EDIT_MAINTAINERS):
		flash("You do not have permission to edit maintainers", "danger")
		return redirect(package.getDetailsURL())

	form = PackageMaintainersForm(formdata=request.form)
	if request.method == "GET":
		form.maintainers_str.data = ", ".join([ x.username for x in package.maintainers if x != package.author ])

	if request.method == "POST" and form.validate():
		usernames = [x.strip().lower() for x in form.maintainers_str.data.split(",")]
		users = User.query.filter(func.lower(User.username).in_(usernames)).all()

		for user in users:
			if not user in package.maintainers:
				triggerNotif(user, current_user,
						"Added you as a maintainer of {}".format(package.title), package.getDetailsURL())

		for user in package.maintainers:
			if user != package.author and not user in users:
				triggerNotif(user, current_user,
						"Removed you as a maintainer of {}".format(package.title), package.getDetailsURL())

		package.maintainers.clear()
		package.maintainers.extend(users)
		package.maintainers.append(package.author)

		triggerNotif(package.author, current_user,
				"Edited {} maintainers".format(package.title), package.getDetailsURL())

		db.session.commit()

		return redirect(package.getDetailsURL())

	users = User.query.filter(User.rank >= UserRank.NEW_MEMBER).order_by(db.asc(User.username)).all()

	return render_template("packages/edit_maintainers.html", \
			package=package, form=form, users=users)


@bp.route("/packages/<author>/<name>/remove-self-maintainer/", methods=["POST"])
@login_required
@is_package_page
def remove_self_maintainers(package):
	if not current_user in package.maintainers:
		flash("You are not a maintainer", "danger")

	elif current_user == package.author:
		flash("Package owners cannot remove themselves as maintainers", "danger")

	else:
		package.maintainers.remove(current_user)

		triggerNotif(package.author, current_user,
				"Removed themself as a maintainer of {}".format(package.title), package.getDetailsURL())

		db.session.commit()

	return redirect(package.getDetailsURL())