# Copyright (C) 2014 Andrey Antukh <niwi@niwi.be>
# Copyright (C) 2014 Jesús Espino <jespinog@gmail.com>
# Copyright (C) 2014 David Barragán <bameda@dbarragan.com>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import uuid
import os.path as path
from unidecode import unidecode

from django.template.defaultfilters import slugify
from django.contrib.contenttypes.models import ContentType

from taiga.projects.history.services import make_key_from_model_object
from taiga.projects.references import sequences as seq
from taiga.projects.references import models as refs
from taiga.projects.services import find_invited_user

from . import serializers

_errors_log = {}


def get_errors(clear=True):
    _errors = _errors_log.copy()
    if clear:
        _errors_log.clear()
    return _errors


def add_errors(section, errors):
    if section in _errors_log:
        _errors_log[section].append(errors)
    else:
        _errors_log[section] = [errors]


def project_to_dict(project):
    return serializers.ProjectExportSerializer(project).data


def store_project(data):
    project_data = {}
    for key, value in data.items():
        excluded_fields = [
            "default_points", "default_us_status", "default_task_status",
            "default_priority", "default_severity", "default_issue_status",
            "default_issue_type", "memberships", "points", "us_statuses",
            "task_statuses", "issue_statuses", "priorities", "severities",
            "issue_types", "userstorycustomattributes", "taskcustomattributes",
            "issuecustomattributes", "roles", "milestones", "wiki_pages",
            "wiki_links", "notify_policies", "user_stories", "issues", "tasks",
        ]
        if key not in excluded_fields:
            project_data[key] = value

    serialized = serializers.ProjectExportSerializer(data=project_data)
    if serialized.is_valid():
        serialized.object._importing = True
        serialized.object.save()
        return serialized
    add_errors("project", serialized.errors)
    return None


def _store_choice(project, data, field, serializer):
    serialized = serializer(data=data)
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        serialized.save()
        return serialized.object
    add_errors(field, serialized.errors)
    return None


def store_choices(project, data, field, serializer):
    result = []
    for choice_data in data.get(field, []):
        result.append(_store_choice(project, choice_data, field, serializer))
    return result


def _store_custom_attribute(project, data, field, serializer):
    serialized = serializer(data=data)
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        serialized.save()
        return serialized.object
    add_errors(field, serialized.errors)
    return None


def store_custom_attributes(project, data, field, serializer):
    result = []
    for custom_attribute_data in data.get(field, []):
        result.append(_store_custom_attribute(project, custom_attribute_data, field, serializer))
    return result

def store_custom_attributes_values(obj, data_values, obj_field, serializer_class):
    data = {
        obj_field: obj.id,
        "values": data_values,
    }

    serializer = serializer_class(data=data)
    if serializer.is_valid():
        serializer.save()
        return serializer

    add_errors("custom_attributes_values", serializer.errors)
    return None


def _use_id_instead_name_as_key_in_custom_attributes_values(custom_attributes, values):
    ret = {}
    for attr in custom_attributes:
        value = values.get(attr["name"], None)
        if value is not None:
            ret[str(attr["id"])] = value

    return ret


def store_role(project, role):
    serialized = serializers.RoleExportSerializer(data=role)
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        serialized.save()
        return serialized
    add_errors("roles", serialized.errors)
    return None


def store_roles(project, data):
    results = []
    for role in data.get("roles", []):
        results.append(store_role(project, role))
    return results


def store_default_choices(project, data):
    def helper(project, field, related, data):
        if field in data:
            value = related.all().get(name=data[field])
        else:
            value = related.all().first()
        setattr(project, field, value)

    helper(project, "default_points", project.points, data)
    helper(project, "default_issue_type", project.issue_types, data)
    helper(project, "default_issue_status", project.issue_statuses, data)
    helper(project, "default_us_status", project.us_statuses, data)
    helper(project, "default_task_status", project.task_statuses, data)
    helper(project, "default_priority", project.priorities, data)
    helper(project, "default_severity", project.severities, data)
    project._importing = True
    project.save()


def store_membership(project, membership):
    serialized = serializers.MembershipExportSerializer(data=membership, context={"project": project})
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        if not serialized.object.token:
            serialized.object.token = str(uuid.uuid1())
        serialized.object.user = find_invited_user(serialized.object.email,
                                                   default=serialized.object.user)
        serialized.save()
        return serialized

    add_errors("memberships", serialized.errors)
    return None


def store_memberships(project, data):
    results = []
    for membership in data.get("memberships", []):
        results.append(store_membership(project, membership))
    return results


def store_task(project, data):
    if "status" not in data and project.default_task_status:
        data["status"] = project.default_task_status.name

    serialized = serializers.TaskExportSerializer(data=data, context={"project": project})
    if serialized.is_valid():
        serialized.object.project = project
        if serialized.object.owner is None:
            serialized.object.owner = serialized.object.project.owner
        serialized.object._importing = True
        serialized.object._not_notify = True

        serialized.save()

        if serialized.object.ref:
            sequence_name = refs.make_sequence_name(project)
            if not seq.exists(sequence_name):
                seq.create(sequence_name)
            seq.set_max(sequence_name, serialized.object.ref)
        else:
            serialized.object.ref, _ = refs.make_reference(serialized.object, project)
            serialized.object.save()

        for task_attachment in data.get("attachments", []):
            store_attachment(project, serialized.object, task_attachment)

        for history in data.get("history", []):
            store_history(project, serialized.object, history)

        custom_attributes_values = data.get("custom_attributes_values", None)
        if custom_attributes_values:
            custom_attributes = serialized.object.project.taskcustomattributes.all().values('id', 'name')
            custom_attributes_values = _use_id_instead_name_as_key_in_custom_attributes_values(custom_attributes,
                                                                                               custom_attributes_values)
            store_custom_attributes_values(serialized.object, custom_attributes_values,
                                           "task", serializers.TaskCustomAttributesValuesExportSerializer)

        return serialized

    add_errors("tasks", serialized.errors)
    return None


def store_milestone(project, milestone):
    serialized = serializers.MilestoneExportSerializer(data=milestone, project=project)
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        serialized.save()

        for task_without_us in milestone.get("tasks_without_us", []):
            task_without_us["user_story"] = None
            store_task(project, task_without_us)
        return serialized

    add_errors("milestones", serialized.errors)
    return None


def store_attachment(project, obj, attachment):
    serialized = serializers.AttachmentExportSerializer(data=attachment)
    if serialized.is_valid():
        serialized.object.content_type = ContentType.objects.get_for_model(obj.__class__)
        serialized.object.object_id = obj.id
        serialized.object.project = project
        if serialized.object.owner is None:
            serialized.object.owner = serialized.object.project.owner
        serialized.object._importing = True
        serialized.object.size = serialized.object.attached_file.size
        serialized.object.name = path.basename(serialized.object.attached_file.name).lower()
        serialized.save()
        return serialized
    add_errors("attachments", serialized.errors)
    return serialized


def store_history(project, obj, history):
    serialized = serializers.HistoryExportSerializer(data=history, context={"project": project})
    if serialized.is_valid():
        serialized.object.key = make_key_from_model_object(obj)
        if serialized.object.diff is None:
            serialized.object.diff = []
        serialized.object._importing = True
        serialized.save()
        return serialized
    add_errors("history", serialized.errors)
    return serialized


def store_wiki_page(project, wiki_page):
    wiki_page["slug"] = slugify(unidecode(wiki_page.get("slug", "")))
    serialized = serializers.WikiPageExportSerializer(data=wiki_page)
    if serialized.is_valid():
        serialized.object.project = project
        if serialized.object.owner is None:
            serialized.object.owner = serialized.object.project.owner
        serialized.object._importing = True
        serialized.object._not_notify = True
        serialized.save()

        for attachment in wiki_page.get("attachments", []):
            store_attachment(project, serialized.object, attachment)

        for history in wiki_page.get("history", []):
            store_history(project, serialized.object, history)

        return serialized

    add_errors("wiki_pages", serialized.errors)
    return None


def store_wiki_link(project, wiki_link):
    serialized = serializers.WikiLinkExportSerializer(data=wiki_link)
    if serialized.is_valid():
        serialized.object.project = project
        serialized.object._importing = True
        serialized.save()
        return serialized

    add_errors("wiki_links", serialized.errors)
    return None


def store_role_point(project, us, role_point):
    serialized = serializers.RolePointsExportSerializer(data=role_point, context={"project": project})
    if serialized.is_valid():
        serialized.object.user_story = us
        serialized.save()
        return serialized.object
    add_errors("role_points", serialized.errors)
    return None


def store_user_story(project, data):
    if "status" not in data and project.default_us_status:
        data["status"] = project.default_us_status.name

    data_data = {key: value for key, value in data.items() if key not in ["role_points", "custom_attributes_values"]}
    serialized = serializers.UserStoryExportSerializer(data=data_data, context={"project": project})

    if serialized.is_valid():
        serialized.object.project = project
        if serialized.object.owner is None:
            serialized.object.owner = serialized.object.project.owner
        serialized.object._importing = True
        serialized.object._not_notify = True

        serialized.save()

        if serialized.object.ref:
            sequence_name = refs.make_sequence_name(project)
            if not seq.exists(sequence_name):
                seq.create(sequence_name)
            seq.set_max(sequence_name, serialized.object.ref)
        else:
            serialized.object.ref, _ = refs.make_reference(serialized.object, project)
            serialized.object.save()

        for us_attachment in data.get("attachments", []):
            store_attachment(project, serialized.object, us_attachment)

        for role_point in data.get("role_points", []):
            store_role_point(project, serialized.object, role_point)

        for history in data.get("history", []):
            store_history(project, serialized.object, history)

        custom_attributes_values = data.get("custom_attributes_values", None)
        if custom_attributes_values:
            custom_attributes = serialized.object.project.userstorycustomattributes.all().values('id', 'name')
            custom_attributes_values = _use_id_instead_name_as_key_in_custom_attributes_values(custom_attributes,
                                                                                               custom_attributes_values)
            store_custom_attributes_values(serialized.object, custom_attributes_values,
                                      "user_story", serializers.UserStoryCustomAttributesValuesExportSerializer)

        return serialized

    add_errors("user_stories", serialized.errors)
    return None


def store_issue(project, data):
    serialized = serializers.IssueExportSerializer(data=data, context={"project": project})

    if "type" not in data and project.default_issue_type:
        data["type"] = project.default_issue_type.name

    if "status" not in data and project.default_issue_status:
        data["status"] = project.default_issue_status.name

    if "priority" not in data and project.default_priority:
        data["priority"] = project.default_priority.name

    if "severity" not in data and project.default_severity:
        data["severity"] = project.default_severity.name

    if serialized.is_valid():
        serialized.object.project = project
        if serialized.object.owner is None:
            serialized.object.owner = serialized.object.project.owner
        serialized.object._importing = True
        serialized.object._not_notify = True

        serialized.save()

        if serialized.object.ref:
            sequence_name = refs.make_sequence_name(project)
            if not seq.exists(sequence_name):
                seq.create(sequence_name)
            seq.set_max(sequence_name, serialized.object.ref)
        else:
            serialized.object.ref, _ = refs.make_reference(serialized.object, project)
            serialized.object.save()

        for attachment in data.get("attachments", []):
            store_attachment(project, serialized.object, attachment)

        for history in data.get("history", []):
            store_history(project, serialized.object, history)

        custom_attributes_values = data.get("custom_attributes_values", None)
        if custom_attributes_values:
            custom_attributes = serialized.object.project.issuecustomattributes.all().values('id', 'name')
            custom_attributes_values = _use_id_instead_name_as_key_in_custom_attributes_values(custom_attributes,
                                                                                               custom_attributes_values)
            store_custom_attributes_values(serialized.object, custom_attributes_values,
                                           "issue", serializers.IssueCustomAttributesValuesExportSerializer)

        return serialized

    add_errors("issues", serialized.errors)
    return None