"""
####################################################################################################
# Copyright Info :    Copyright (c) Davar Lab @ Hikvision Research Institute. All rights reserved.
# Filename       :    standard_roi_head_w_gcn.py
# Abstract       :    insert gcn module into standard roi head.

# Current Version:    1.0.0
# Date           :    2021-12-13
######################################################################################################
"""
import torch

from mmdet.core import bbox2result, bbox2roi
from mmdet.models.builder import HEADS
from mmdet.models.roi_heads.standard_roi_head import StandardRoIHead


@HEADS.register_module()
class StandardRoIHeadWGCN(StandardRoIHead):
    """Simplest base roi head including one bbox head and one mask head."""

    def forward_train(self,
                      x,
                      img_metas,
                      proposal_list,
                      gt_bboxes,
                      gt_labels,
                      gt_bboxes_ignore=None,
                      gt_masks=None):
        """
        Args:
            x (list[Tensor]): list of multi-level img features.
            img_metas (list[dict]): list of image info dict where each dict
                has: 'img_shape', 'scale_factor', 'flip', and may also contain
                'filename', 'ori_shape', 'pad_shape', and 'img_norm_cfg'.
                For details on the values of these keys see
                `mmdet/datasets/pipelines/formatting.py:Collect`.
            proposals (list[Tensors]): list of region proposals.
            gt_bboxes (list[Tensor]): Ground truth bboxes for each image with
                shape (num_gts, 4) in [tl_x, tl_y, br_x, br_y] format.
            gt_labels (list[Tensor]): class indices corresponding to each box
            gt_bboxes_ignore (None | list[Tensor]): specify which bounding
                boxes can be ignored when computing the loss.
            gt_masks (None | Tensor) : true segmentation masks for each box
                used if the architecture supports a segmentation task.

        Returns:
            dict[str, Tensor]: a dictionary of loss components
        """
        # assign gts and sample proposals
        if self.with_bbox or self.with_mask:
            num_imgs = len(img_metas)
            if gt_bboxes_ignore is None:
                gt_bboxes_ignore = [None for _ in range(num_imgs)]
            sampling_results = []
            for i in range(num_imgs):
                assign_result = self.bbox_assigner.assign(
                    proposal_list[i], gt_bboxes[i], gt_bboxes_ignore[i],
                    gt_labels[i])
                sampling_result = self.bbox_sampler.sample(
                    assign_result,
                    proposal_list[i],
                    gt_bboxes[i],
                    gt_labels[i],
                    feats=[lvl_feat[i][None] for lvl_feat in x])
                sampling_results.append(sampling_result)

        losses = dict()
        # bbox head forward and loss
        if self.with_bbox:
            bbox_results = self._bbox_forward_train(x, sampling_results,
                                                    gt_bboxes, gt_labels,
                                                    img_metas)
            losses.update(bbox_results['loss_bbox'])

        # mask head forward and loss
        if self.with_mask:
            mask_results = self._mask_forward_train(x, sampling_results,
                                                    bbox_results['bbox_feats'],
                                                    gt_masks, img_metas)
            losses.update(mask_results['loss_mask'])

        return losses

    def _bbox_forward(self, x, rois, img_metas=None):
        """Box head forward function used in both training and testing."""
        # TODO: a more flexible way to decide which feature maps to use
        bbox_feats = self.bbox_roi_extractor(
            x[:self.bbox_roi_extractor.num_inputs], rois)
        if self.with_shared_head:
            bbox_feats = self.shared_head(bbox_feats)
        cls_score, bbox_pred = self.bbox_head(bbox_feats, rois, img_metas)

        bbox_results = dict(
            cls_score=cls_score, bbox_pred=bbox_pred, bbox_feats=bbox_feats)
        return bbox_results

    def _bbox_forward_train(self, x, sampling_results, gt_bboxes, gt_labels,
                            img_metas):
        """Run forward function and calculate loss for box head in training."""
        rois = bbox2roi([res.bboxes for res in sampling_results])
        bbox_results = self._bbox_forward(x, rois, img_metas)

        bbox_targets = self.bbox_head.get_targets(sampling_results, gt_bboxes,
                                                  gt_labels, self.train_cfg)
        loss_bbox = self.bbox_head.loss(bbox_results['cls_score'],
                                        bbox_results['bbox_pred'],
                                        rois,
                                        *bbox_targets)

        bbox_results.update(loss_bbox=loss_bbox)
        return bbox_results

    def _mask_forward_train(self, x, sampling_results, bbox_feats, gt_masks,
                            img_metas):
        """Run forward function and calculate loss for mask head in
        training."""
        if not self.share_roi_extractor:
            pos_rois = bbox2roi([res.pos_bboxes for res in sampling_results])
            mask_results = self._mask_forward(x, pos_rois)
        else:
            pos_inds = []
            device = bbox_feats.device
            for res in sampling_results:
                pos_inds.append(
                    torch.ones(
                        res.pos_bboxes.shape[0],
                        device=device,
                        dtype=torch.uint8))
                pos_inds.append(
                    torch.zeros(
                        res.neg_bboxes.shape[0],
                        device=device,
                        dtype=torch.uint8))
            pos_inds = torch.cat(pos_inds)

            mask_results = self._mask_forward(
                x, pos_inds=pos_inds, bbox_feats=bbox_feats)

        mask_targets = self.mask_head.get_targets(sampling_results, gt_masks,
                                                  self.train_cfg)
        pos_labels = torch.cat([res.pos_gt_labels for res in sampling_results])
        loss_mask = self.mask_head.loss(mask_results['mask_pred'],
                                        mask_targets, pos_labels)

        mask_results.update(loss_mask=loss_mask, mask_targets=mask_targets)
        return mask_results

    def _mask_forward(self, x, rois=None, pos_inds=None, bbox_feats=None):
        """Mask head forward function used in both training and testing."""
        assert ((rois is not None) ^
                (pos_inds is not None and bbox_feats is not None))
        if rois is not None:
            mask_feats = self.mask_roi_extractor(
                x[:self.mask_roi_extractor.num_inputs], rois)
            if self.with_shared_head:
                mask_feats = self.shared_head(mask_feats)
        else:
            assert bbox_feats is not None
            mask_feats = bbox_feats[pos_inds]

        mask_pred = self.mask_head(mask_feats)
        mask_results = dict(mask_pred=mask_pred, mask_feats=mask_feats)
        return mask_results

    def simple_test(self,
                    x,
                    proposal_list,
                    img_metas,
                    proposals=None,
                    rescale=False):
        """Test without augmentation."""
        assert self.with_bbox, 'Bbox head must be implemented.'

        det_bboxes, det_labels = self.simple_test_bboxes(
            x, img_metas, proposal_list, self.test_cfg, rescale=rescale)
        if torch.onnx.is_in_onnx_export():
            if self.with_mask:
                segm_results = self.simple_test_mask(
                    x, img_metas, det_bboxes, det_labels, rescale=rescale)
                return det_bboxes, det_labels, segm_results
            else:
                return det_bboxes, det_labels

        bbox_results = [
            bbox2result(det_bboxes[i], det_labels[i],
                        self.bbox_head.num_classes)
            for i in range(len(det_bboxes))
        ]

        if not self.with_mask:
            return bbox_results
        else:
            segm_results = self.simple_test_mask(
                x, img_metas, det_bboxes, det_labels, rescale=rescale)
            return list(zip(bbox_results, segm_results))

    def simple_test_bboxes(self,
                           x,
                           img_metas,
                           proposals,
                           rcnn_test_cfg,
                           rescale=False):
        """Test only det bboxes without augmentation."""
        rois = bbox2roi(proposals)
        bbox_results = self._bbox_forward(x, rois, img_metas)
        img_shape = img_metas[0]['img_shape']
        scale_factor = img_metas[0]['scale_factor']
        det_bboxes, det_labels = self.bbox_head.get_bboxes(
            rois,
            bbox_results['cls_score'],
            bbox_results['bbox_pred'],
            img_shape,
            scale_factor,
            rescale=rescale,
            cfg=rcnn_test_cfg)
        return det_bboxes, det_labels
