"""
JSON API for the Order app
"""

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import generics
from rest_framework import filters

from django.conf.urls import url, include

from InvenTree.helpers import str2bool
from InvenTree.api import AttachmentMixin
from InvenTree.status_codes import PurchaseOrderStatus, SalesOrderStatus

from part.models import Part
from company.models import SupplierPart

from .models import PurchaseOrder, PurchaseOrderLineItem
from .models import PurchaseOrderAttachment
from .serializers import POSerializer, POLineItemSerializer, POAttachmentSerializer

from .models import SalesOrder, SalesOrderLineItem
from .models import SalesOrderAttachment
from .serializers import SalesOrderSerializer, SOLineItemSerializer, SOAttachmentSerializer


class POList(generics.ListCreateAPIView):
    """ API endpoint for accessing a list of PurchaseOrder objects

    - GET: Return list of PO objects (with filters)
    - POST: Create a new PurchaseOrder object
    """

    queryset = PurchaseOrder.objects.all()
    serializer_class = POSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['supplier_detail'] = str2bool(self.request.query_params.get('supplier_detail', False))
        except AttributeError:
            pass

        # Ensure the request context is passed through
        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    def get_queryset(self, *args, **kwargs):

        queryset = super().get_queryset(*args, **kwargs)

        queryset = queryset.prefetch_related(
            'supplier',
            'lines',
        )

        queryset = POSerializer.annotate_queryset(queryset)

        return queryset

    def filter_queryset(self, queryset):

        # Perform basic filtering
        queryset = super().filter_queryset(queryset)

        params = self.request.query_params

        # Filter by 'outstanding' status
        outstanding = params.get('outstanding', None)

        if outstanding is not None:
            outstanding = str2bool(outstanding)

            if outstanding:
                queryset = queryset.filter(status__in=PurchaseOrderStatus.OPEN)
            else:
                queryset = queryset.exclude(status__in=PurchaseOrderStatus.OPEN)

        # Filter by 'overdue' status
        overdue = params.get('overdue', None)

        if overdue is not None:
            overdue = str2bool(overdue)

            if overdue:
                queryset = queryset.filter(PurchaseOrder.OVERDUE_FILTER)
            else:
                queryset = queryset.exclude(PurchaseOrder.OVERDUE_FILTER)

        # Special filtering for 'status' field
        status = params.get('status', None)

        if status is not None:
            # First attempt to filter by integer value
            queryset = queryset.filter(status=status)

        # Attempt to filter by part
        part = params.get('part', None)

        if part is not None:
            try:
                part = Part.objects.get(pk=part)
                queryset = queryset.filter(id__in=[p.id for p in part.purchase_orders()])
            except (Part.DoesNotExist, ValueError):
                pass

        # Attempt to filter by supplier part
        supplier_part = params.get('supplier_part', None)

        if supplier_part is not None:
            try:
                supplier_part = SupplierPart.objects.get(pk=supplier_part)
                queryset = queryset.filter(id__in=[p.id for p in supplier_part.purchase_orders()])
            except (ValueError, SupplierPart.DoesNotExist):
                pass

        # Filter by 'date range'
        min_date = params.get('min_date', None)
        max_date = params.get('max_date', None)

        if min_date is not None and max_date is not None:
            queryset = PurchaseOrder.filterByDate(queryset, min_date, max_date)

        return queryset

    filter_backends = [
        DjangoFilterBackend,
        filters.SearchFilter,
        filters.OrderingFilter,
    ]

    filter_fields = [
        'supplier',
    ]

    search_fields = [
        'reference',
        'supplier__name',
        'supplier_reference',
        'description',
    ]

    ordering_fields = [
        'creation_date',
        'reference',
        'supplier__name',
        'target_date',
        'line_items',
        'status',
    ]

    ordering = '-creation_date'


class PODetail(generics.RetrieveUpdateAPIView):
    """ API endpoint for detail view of a PurchaseOrder object """

    queryset = PurchaseOrder.objects.all()
    serializer_class = POSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['supplier_detail'] = str2bool(self.request.query_params.get('supplier_detail', False))
        except AttributeError:
            pass

        # Ensure the request context is passed through
        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    def get_queryset(self, *args, **kwargs):

        queryset = super().get_queryset(*args, **kwargs)

        queryset = queryset.prefetch_related(
            'supplier',
            'lines',
        )

        queryset = POSerializer.annotate_queryset(queryset)

        return queryset


class POLineItemList(generics.ListCreateAPIView):
    """ API endpoint for accessing a list of POLineItem objects

    - GET: Return a list of PO Line Item objects
    - POST: Create a new PurchaseOrderLineItem object
    """

    queryset = PurchaseOrderLineItem.objects.all()
    serializer_class = POLineItemSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['part_detail'] = str2bool(self.request.query_params.get('part_detail', False))
        except AttributeError:
            pass

        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    filter_backends = [
        DjangoFilterBackend,
        filters.SearchFilter,
        filters.OrderingFilter
    ]

    ordering_fields = [
        'part__part__name',
        'part__MPN',
        'part__SKU',
        'reference',
        'quantity',
        'received',
    ]

    search_fields = [
        'part__part__name',
        'part__part__description',
        'part__MPN',
        'part__SKU',
        'reference',
    ]

    filter_fields = [
        'order',
        'part'
    ]


class POLineItemDetail(generics.RetrieveUpdateAPIView):
    """ API endpoint for detail view of a PurchaseOrderLineItem object """

    queryset = PurchaseOrderLineItem
    serializer_class = POLineItemSerializer


class SOAttachmentList(generics.ListCreateAPIView, AttachmentMixin):
    """
    API endpoint for listing (and creating) a SalesOrderAttachment (file upload)
    """

    queryset = SalesOrderAttachment.objects.all()
    serializer_class = SOAttachmentSerializer

    filter_fields = [
        'order',
    ]


class SOList(generics.ListCreateAPIView):
    """
    API endpoint for accessing a list of SalesOrder objects.

    - GET: Return list of SO objects (with filters)
    - POST: Create a new SalesOrder
    """

    queryset = SalesOrder.objects.all()
    serializer_class = SalesOrderSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['customer_detail'] = str2bool(self.request.query_params.get('customer_detail', False))
        except AttributeError:
            pass

        # Ensure the context is passed through to the serializer
        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    def get_queryset(self, *args, **kwargs):

        queryset = super().get_queryset(*args, **kwargs)

        queryset = queryset.prefetch_related(
            'customer',
            'lines'
        )

        queryset = SalesOrderSerializer.annotate_queryset(queryset)

        return queryset

    def filter_queryset(self, queryset):
        """
        Perform custom filtering operations on the SalesOrder queryset.
        """

        queryset = super().filter_queryset(queryset)

        params = self.request.query_params

        # Filter by 'outstanding' status
        outstanding = params.get('outstanding', None)

        if outstanding is not None:
            outstanding = str2bool(outstanding)

            if outstanding:
                queryset = queryset.filter(status__in=SalesOrderStatus.OPEN)
            else:
                queryset = queryset.exclude(status__in=SalesOrderStatus.OPEN)

        # Filter by 'overdue' status
        overdue = params.get('overdue', None)

        if overdue is not None:
            overdue = str2bool(overdue)

            if overdue:
                queryset = queryset.filter(SalesOrder.OVERDUE_FILTER)
            else:
                queryset = queryset.exclude(SalesOrder.OVERDUE_FILTER)

        status = params.get('status', None)

        if status is not None:
            queryset = queryset.filter(status=status)

        # Filter by "Part"
        # Only return SalesOrder which have LineItem referencing the part
        part = params.get('part', None)

        if part is not None:
            try:
                part = Part.objects.get(pk=part)
                queryset = queryset.filter(id__in=[so.id for so in part.sales_orders()])
            except (Part.DoesNotExist, ValueError):
                pass

        # Filter by 'date range'
        min_date = params.get('min_date', None)
        max_date = params.get('max_date', None)

        if min_date is not None and max_date is not None:
            queryset = SalesOrder.filterByDate(queryset, min_date, max_date)

        return queryset

    filter_backends = [
        DjangoFilterBackend,
        filters.SearchFilter,
        filters.OrderingFilter,
    ]

    filter_fields = [
        'customer',
    ]

    ordering_fields = [
        'creation_date',
        'reference',
        'customer__name',
        'customer_reference',
        'status',
        'target_date',
        'line_items',
        'shipment_date',
    ]

    search_fields = [
        'customer__name',
        'reference',
        'description',
        'customer_reference',
    ]

    ordering = '-creation_date'


class SODetail(generics.RetrieveUpdateAPIView):
    """
    API endpoint for detail view of a SalesOrder object.
    """

    queryset = SalesOrder.objects.all()
    serializer_class = SalesOrderSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['customer_detail'] = str2bool(self.request.query_params.get('customer_detail', False))
        except AttributeError:
            pass

        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    def get_queryset(self, *args, **kwargs):

        queryset = super().get_queryset(*args, **kwargs)

        queryset = queryset.prefetch_related('customer', 'lines')

        queryset = SalesOrderSerializer.annotate_queryset(queryset)

        return queryset


class SOLineItemList(generics.ListCreateAPIView):
    """
    API endpoint for accessing a list of SalesOrderLineItem objects.
    """

    queryset = SalesOrderLineItem.objects.all()
    serializer_class = SOLineItemSerializer

    def get_serializer(self, *args, **kwargs):

        try:
            kwargs['part_detail'] = str2bool(self.request.query_params.get('part_detail', False))
        except AttributeError:
            pass

        try:
            kwargs['order_detail'] = str2bool(self.request.query_params.get('order_detail', False))
        except AttributeError:
            pass

        try:
            kwargs['allocations'] = str2bool(self.request.query_params.get('allocations', False))
        except AttributeError:
            pass

        kwargs['context'] = self.get_serializer_context()

        return self.serializer_class(*args, **kwargs)

    def get_queryset(self, *args, **kwargs):

        queryset = super().get_queryset(*args, **kwargs)

        queryset = queryset.prefetch_related(
            'part',
            'part__stock_items',
            'allocations',
            'allocations__item__location',
            'order',
            'order__stock_items',
        )

        return queryset

    filter_backends = [
        DjangoFilterBackend,
        filters.SearchFilter,
        filters.OrderingFilter
    ]

    ordering_fields = [
        'part__name',
        'quantity',
        'reference',
    ]

    search_fields = [
        'part__name',
        'quantity',
        'reference',
    ]

    filter_fields = [
        'order',
        'part',
    ]


class SOLineItemDetail(generics.RetrieveUpdateAPIView):
    """ API endpoint for detail view of a SalesOrderLineItem object """

    queryset = SalesOrderLineItem.objects.all()
    serializer_class = SOLineItemSerializer


class POAttachmentList(generics.ListCreateAPIView, AttachmentMixin):
    """
    API endpoint for listing (and creating) a PurchaseOrderAttachment (file upload)
    """

    queryset = PurchaseOrderAttachment.objects.all()
    serializer_class = POAttachmentSerializer

    filter_fields = [
        'order',
    ]


order_api_urls = [
    # API endpoints for purchase orders
    url(r'^po/(?P<pk>\d+)/$', PODetail.as_view(), name='api-po-detail'),
    url(r'po/attachment/', include([
        url(r'^.*$', POAttachmentList.as_view(), name='api-po-attachment-list'),
    ])),
    url(r'^po/.*$', POList.as_view(), name='api-po-list'),

    # API endpoints for purchase order line items
    url(r'^po-line/(?P<pk>\d+)/$', POLineItemDetail.as_view(), name='api-po-line-detail'),
    url(r'^po-line/$', POLineItemList.as_view(), name='api-po-line-list'),

    # API endpoints for sales ordesr
    url(r'^so/(?P<pk>\d+)/$', SODetail.as_view(), name='api-so-detail'),
    url(r'so/attachment/', include([
        url(r'^.*$', SOAttachmentList.as_view(), name='api-so-attachment-list'),
    ])),

    url(r'^so/.*$', SOList.as_view(), name='api-so-list'),

    # API endpoints for sales order line items
    url(r'^so-line/(?P<pk>\d+)/$', SOLineItemDetail.as_view(), name='api-so-line-detail'),
    url(r'^so-line/$', SOLineItemList.as_view(), name='api-so-line-list'),
]