# coding: utf-8
# copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import division

import os
import cv2
import numpy as np
from PIL import Image, ImageDraw
import math


def visualize_box_mask(im, results, labels, threshold=0.5):
    """
    Args:
        im (str/np.ndarray): path of image/np.ndarray read by cv2
        results (dict): include 'boxes': np.ndarray: shape:[N,6], N: number of box,
                        matix element:[class, score, x_min, y_min, x_max, y_max]
        labels (list): labels:['class1', ..., 'classn']
        threshold (float): Threshold of score.
    Returns:
        im (PIL.Image.Image): visualized image
    """
    if isinstance(im, str):
        im = Image.open(im).convert('RGB')
    else:
        im = Image.fromarray(im)
    if 'boxes' in results and len(results['boxes']) > 0:
        im = draw_box(im, results['boxes'], labels, threshold=threshold)
    return im


def get_color_map_list(num_classes):
    """
    Args:
        num_classes (int): number of class
    Returns:
        color_map (list): RGB color list
    """
    color_map = num_classes * [0, 0, 0]
    for i in range(0, num_classes):
        j = 0
        lab = i
        while lab:
            color_map[i * 3] |= (((lab >> 0) & 1) << (7 - j))
            color_map[i * 3 + 1] |= (((lab >> 1) & 1) << (7 - j))
            color_map[i * 3 + 2] |= (((lab >> 2) & 1) << (7 - j))
            j += 1
            lab >>= 3
    color_map = [color_map[i:i + 3] for i in range(0, len(color_map), 3)]
    return color_map


def draw_box(im, np_boxes, labels, threshold=0.5):
    """
    Args:
        im (PIL.Image.Image): PIL image
        np_boxes (np.ndarray): shape:[N,6], N: number of box,
                               matix element:[class, score, x_min, y_min, x_max, y_max]
        labels (list): labels:['class1', ..., 'classn']
        threshold (float): threshold of box
    Returns:
        im (PIL.Image.Image): visualized image
    """
    draw_thickness = min(im.size) // 320
    draw = ImageDraw.Draw(im)
    clsid2color = {}
    color_list = get_color_map_list(len(labels))
    expect_boxes = (np_boxes[:, 1] > threshold) & (np_boxes[:, 0] > -1)
    np_boxes = np_boxes[expect_boxes, :]

    for dt in np_boxes:
        clsid, bbox, score = int(dt[0]), dt[2:], dt[1]
        if clsid not in clsid2color:
            clsid2color[clsid] = color_list[clsid]
        color = tuple(clsid2color[clsid])

        if len(bbox) == 4:
            xmin, ymin, xmax, ymax = bbox
            print('class_id:{:d}, confidence:{:.4f}, left_top:[{:.2f},{:.2f}],'
                  'right_bottom:[{:.2f},{:.2f}]'.format(
                      int(clsid), score, xmin, ymin, xmax, ymax))
            # draw bbox
            draw.line(
                [(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin),
                 (xmin, ymin)],
                width=draw_thickness,
                fill=color)
        elif len(bbox) == 8:
            x1, y1, x2, y2, x3, y3, x4, y4 = bbox
            draw.line(
                [(x1, y1), (x2, y2), (x3, y3), (x4, y4), (x1, y1)],
                width=2,
                fill=color)
            xmin = min(x1, x2, x3, x4)
            ymin = min(y1, y2, y3, y4)

        # draw label
        text = "{} {:.4f}".format(labels[clsid], score)
        tw, th = draw.textsize(text)
        draw.rectangle(
            [(xmin + 1, ymin - th), (xmin + tw + 1, ymin)], fill=color)
        draw.text((xmin + 1, ymin - th), text, fill=(255, 255, 255))
    return im


def get_color(idx):
    idx = idx * 3
    color = ((37 * idx) % 255, (17 * idx) % 255, (29 * idx) % 255)
    return color


def plot_tracking(image,
                  tlwhs,
                  obj_ids,
                  scores=None,
                  frame_id=0,
                  fps=0.,
                  ids2names=[]):
    im = np.ascontiguousarray(np.copy(image))
    im_h, im_w = im.shape[:2]

    top_view = np.zeros([im_w, im_w, 3], dtype=np.uint8) + 255

    text_scale = max(1, image.shape[1] / 1600.)
    text_thickness = 2
    line_thickness = max(1, int(image.shape[1] / 500.))

    radius = max(5, int(im_w / 140.))
    cv2.putText(
        im,
        'frame: %d fps: %.2f num: %d' % (frame_id, fps, len(tlwhs)),
        (0, int(15 * text_scale)),
        cv2.FONT_HERSHEY_PLAIN,
        text_scale, (0, 0, 255),
        thickness=2)

    for i, tlwh in enumerate(tlwhs):
        x1, y1, w, h = tlwh
        intbox = tuple(map(int, (x1, y1, x1 + w, y1 + h)))
        obj_id = int(obj_ids[i])
        id_text = '{}'.format(int(obj_id))
        if ids2names != []:
            assert len(ids2names) == 1, "plot_tracking only supports single classes."
            id_text = '{}_'.format(ids2names[0]) + id_text
        _line_thickness = 1 if obj_id <= 0 else line_thickness
        color = get_color(abs(obj_id))
        cv2.rectangle(
            im, intbox[0:2], intbox[2:4], color=color, thickness=line_thickness)
        cv2.putText(
            im,
            id_text, (intbox[0], intbox[1] - 10),
            cv2.FONT_HERSHEY_PLAIN,
            text_scale, (0, 0, 255),
            thickness=text_thickness)

        if scores is not None:
            text = '{:.2f}'.format(float(scores[i]))
            cv2.putText(
                im,
                text, (intbox[0], intbox[1] + 10),
                cv2.FONT_HERSHEY_PLAIN,
                text_scale, (0, 255, 255),
                thickness=text_thickness)
    return im


def plot_tracking_dict(image,
                       num_classes,
                       tlwhs_dict,
                       obj_ids_dict,
                       scores_dict,
                       frame_id=0,
                       fps=0.,
                       ids2names=[]):
    im = np.ascontiguousarray(np.copy(image))
    im_h, im_w = im.shape[:2]

    top_view = np.zeros([im_w, im_w, 3], dtype=np.uint8) + 255

    text_scale = max(1, image.shape[1] / 1600.)
    text_thickness = 2
    line_thickness = max(1, int(image.shape[1] / 500.))

    radius = max(5, int(im_w / 140.))

    for cls_id in range(num_classes):
        tlwhs = tlwhs_dict[cls_id]
        obj_ids = obj_ids_dict[cls_id]
        scores = scores_dict[cls_id]
        cv2.putText(
            im,
            'frame: %d fps: %.2f num: %d' % (frame_id, fps, len(tlwhs)),
            (0, int(15 * text_scale)),
            cv2.FONT_HERSHEY_PLAIN,
            text_scale, (0, 0, 255),
            thickness=2)

        for i, tlwh in enumerate(tlwhs):
            x1, y1, w, h = tlwh
            intbox = tuple(map(int, (x1, y1, x1 + w, y1 + h)))
            obj_id = int(obj_ids[i])

            id_text = '{}'.format(int(obj_id))
            if ids2names != []:
                id_text = '{}_{}'.format(ids2names[cls_id], id_text)
            else:
                id_text = 'class{}_{}'.format(cls_id, id_text)

            _line_thickness = 1 if obj_id <= 0 else line_thickness
            color = get_color(abs(obj_id))
            cv2.rectangle(
                im,
                intbox[0:2],
                intbox[2:4],
                color=color,
                thickness=line_thickness)
            cv2.putText(
                im,
                id_text, (intbox[0], intbox[1] - 10),
                cv2.FONT_HERSHEY_PLAIN,
                text_scale, (0, 0, 255),
                thickness=text_thickness)

            if scores is not None:
                text = '{:.2f}'.format(float(scores[i]))
                cv2.putText(
                    im,
                    text, (intbox[0], intbox[1] + 10),
                    cv2.FONT_HERSHEY_PLAIN,
                    text_scale, (0, 255, 255),
                    thickness=text_thickness)
    return im