from enum import Enum

import cv2


class MethodAveragePrecision(Enum):
    """
    Class representing if the coordinates are relative to the
    image size or are absolute values.

        Developed by: Rafael Padilla
        Last modification: Apr 28 2018
    """
    EveryPointInterpolation = 1
    ElevenPointInterpolation = 2


class CoordinatesType(Enum):
    """
    Class representing if the coordinates are relative to the
    image size or are absolute values.

        Developed by: Rafael Padilla
        Last modification: Apr 28 2018
    """
    Relative = 1
    Absolute = 2


class BBType(Enum):
    """
    Class representing if the bounding box is groundtruth or not.

        Developed by: Rafael Padilla
        Last modification: May 24 2018
    """
    GroundTruth = 1
    Detected = 2


class BBFormat(Enum):
    """
    Class representing the format of a bounding box.
    It can be (X,Y,width,height) => XYWH
    or (X1,Y1,X2,Y2) => XYX2Y2

        Developed by: Rafael Padilla
        Last modification: May 24 2018
    """
    XYWH = 1
    XYX2Y2 = 2


def convertToRelativeValues(size, box):
    """Convert absolute box coordinates to relative ones.

    Args:
        size (tuple of int): (width, height) of the image
        box (tuple of int): (X1, X2, Y1, Y2) of the bounding box
    """
    dw = 1. / (size[0])
    dh = 1. / (size[1])
    cx = (box[1] + box[0]) / 2.0
    cy = (box[3] + box[2]) / 2.0
    w = box[1] - box[0]
    h = box[3] - box[2]
    x = cx * dw
    y = cy * dh
    w = w * dw
    h = h * dh
    return (x, y, w, h)


def convertToAbsoluteValues(size, box):
    """Convert relative box coordinates to absolute ones.
    Args:
        size (tuple of int): (width, height) of the image
        box (tuple of int): (centerX, centerY, w, h) of the bounding box relative to the image
    """
    xIn = round(((2 * float(box[0]) - float(box[2])) * size[0] / 2))
    yIn = round(((2 * float(box[1]) - float(box[3])) * size[1] / 2))
    xEnd = xIn + round(float(box[2]) * size[0])
    yEnd = yIn + round(float(box[3]) * size[1])
    if xIn < 0:
        xIn = 0
    if yIn < 0:
        yIn = 0
    if xEnd >= size[0]:
        xEnd = size[0] - 1
    if yEnd >= size[1]:
        yEnd = size[1] - 1
    return (xIn, yIn, xEnd, yEnd)


def add_bb_into_image(image, bb, color=(255, 0, 0), thickness=2, label=None):
    r = int(color[0])
    g = int(color[1])
    b = int(color[2])

    font = cv2.FONT_HERSHEY_SIMPLEX
    fontScale = 0.5
    fontThickness = 1

    x1, y1, x2, y2 = bb.getAbsoluteBoundingBox(BBFormat.XYX2Y2)
    x1 = int(x1)
    y1 = int(y1)
    x2 = int(x2)
    y2 = int(y2)
    cv2.rectangle(image, (x1, y1), (x2, y2), (b, g, r), thickness)
    # Add label
    if label is not None:
        # Get size of the text box
        (tw, th) = cv2.getTextSize(label, font, fontScale, fontThickness)[0]
        # Top-left coord of the textbox
        (xin_bb, yin_bb) = (x1 + thickness, y1 - th + int(12.5 * fontScale))
        # Checking position of the text top-left (outside or inside the bb)
        if yin_bb - th <= 0:  # if outside the image
            yin_bb = y1 + th  # put it inside the bb
        r_Xin = x1 - int(thickness / 2)
        r_Yin = y1 - th - int(thickness / 2)
        # Draw filled rectangle to put the text in it
        cv2.rectangle(image, (r_Xin, r_Yin - thickness), (r_Xin + tw + \
                      thickness * 3, r_Yin + th + int(12.5 * fontScale)), (b, g, r), -1)
        cv2.putText(image, label, (xin_bb, yin_bb), font, fontScale,
                    (0, 0, 0), fontThickness, cv2.LINE_AA)
    return image