#!/usr/bin/env python

import unittest
import random
import time

from argaze import GazeFeatures
from argaze.GazeAnalysis import DispersionBasedGazeMovementIdentifier

import numpy

def build_gaze_fixation(size: int, center: tuple, dispersion: float, start_time: float, min_time: float, max_time: float, validity: list = []):
    """ Generate N TimeStampedGazePsoitions dispersed around a center point for testing purpose.
        Timestamps are current time after random sleep (second).
        GazePositions are random values.
    """
    ts_gaze_positions = GazeFeatures.TimeStampedGazePositions()

    for i in range(0, size):

        # Check position validity
        valid = True
        if len(validity) > i:

             valid = validity[i]

        if valid:

            # Edit gaze position
            random_x = center[0] + dispersion * (random.random() - 0.5)
            random_y = center[1] + dispersion * (random.random() - 0.5)
            gaze_position = GazeFeatures.GazePosition((random_x, random_y))

        else:

            gaze_position = GazeFeatures.UnvalidGazePosition()

        # Store gaze position
        ts = time.time() - start_time
        ts_gaze_positions[ts] = gaze_position

        # Sleep a random time
        sleep_time = random.random() * (max_time - min_time) + min_time
        time.sleep(sleep_time)

    return ts_gaze_positions

class TestDispersionBasedGazeMovementIdentifierClass(unittest.TestCase):
    """Test DispersionBasedGazeMovementIdentifier class."""

    def test_fixation_identification(self):
        """Test DispersionBasedGazeMovementIdentifier fixation identification."""

        size = 10
        center = (0, 0)
        dispersion = 10
        start_time = time.time()
        min_time = 0.01
        max_time = 0.1
        
        ts_gaze_positions = build_gaze_fixation(size, center, dispersion, start_time, min_time, max_time)
        gaze_movement_identifier = DispersionBasedGazeMovementIdentifier.GazeMovementIdentifier(dispersion_threshold=dispersion, duration_threshold=min_time*2)
        ts_fixations, ts_saccades, ts_status = gaze_movement_identifier.identify(ts_gaze_positions)

        # Check result size
        self.assertEqual(len(ts_fixations), 1)
        self.assertEqual(len(ts_saccades), 0)
        self.assertEqual(len(ts_status), size)

        # Check fixation
        ts, fixation = ts_fixations.pop_first()

        self.assertEqual(len(fixation.positions.keys()), size)
        self.assertLessEqual(fixation.dispersion, dispersion)
        self.assertGreaterEqual(fixation.duration, size * min_time)
        self.assertLessEqual(fixation.duration, size * max_time)

    def test_fixation_and_saccade_identification(self):
        """Test DispersionBasedGazeMovementIdentifier fixation and saccade identification."""

        size = 10
        center_A = (0, 0)
        center_B = (50, 50)
        dispersion = 10
        start_time = time.time()
        min_time = 0.01
        max_time = 0.1
        
        ts_gaze_positions_A = build_gaze_fixation(size, center_A, dispersion, start_time, min_time, max_time)
        ts_gaze_positions_B = build_gaze_fixation(size, center_B, dispersion, start_time, min_time, max_time)

        ts_gaze_positions = ts_gaze_positions_A.append(ts_gaze_positions_B)

        gaze_movement_identifier = DispersionBasedGazeMovementIdentifier.GazeMovementIdentifier(dispersion_threshold=dispersion, duration_threshold=min_time*2)
        ts_fixations, ts_saccades, ts_status = gaze_movement_identifier.identify(ts_gaze_positions)

        # Check result size
        self.assertEqual(len(ts_fixations), 2)
        self.assertEqual(len(ts_saccades), 1)
        self.assertEqual(len(ts_status), size*2)

        # Check first fixation
        ts, fixation = ts_fixations.pop_first()

        self.assertEqual(len(fixation.positions.keys()), size)
        self.assertLessEqual(fixation.dispersion, dispersion)
        self.assertGreaterEqual(fixation.duration, size * min_time)
        self.assertLessEqual(fixation.duration, size * max_time)

        # Check first saccade
        ts, saccade = ts_saccades.pop_first()

        self.assertEqual(len(saccade.positions.keys()), 2)
        self.assertGreaterEqual(saccade.duration, min_time)
        self.assertLessEqual(saccade.duration, max_time)

        # Check second fixation
        ts, fixation = ts_fixations.pop_first()

        self.assertEqual(len(fixation.positions.keys()), size)
        self.assertLessEqual(fixation.dispersion, dispersion)
        self.assertGreaterEqual(fixation.duration, size * min_time)
        self.assertLessEqual(fixation.duration, size * max_time)

    def test_invalid_gaze_position(self):
        """Test DispersionBasedGazeMovementIdentifier fixation and saccade identification with invalid gaze position."""

        size = 10
        center = (0, 0)
        dispersion = 10
        start_time = time.time()
        min_time = 0.01
        max_time = 0.1
        validity = [True, True, True, True, False, False, True, True, True, True]
        
        ts_gaze_positions = build_gaze_fixation(size, center, dispersion, start_time, min_time, max_time, validity)

        gaze_movement_identifier = DispersionBasedGazeMovementIdentifier.GazeMovementIdentifier(dispersion_threshold=dispersion, duration_threshold=min_time*2)
        ts_fixations, ts_saccades, ts_status = gaze_movement_identifier.identify(ts_gaze_positions)

        # Check result size
        self.assertEqual(len(ts_fixations), 1)
        self.assertEqual(len(ts_saccades), 0)
        self.assertEqual(len(ts_status), size-2)

        # Check fixation
        ts, fixation = ts_fixations.pop_first()

        self.assertEqual(len(fixation.positions.keys()), size-2)
        self.assertLessEqual(fixation.dispersion, dispersion)
        self.assertGreaterEqual(fixation.duration, size * min_time)
        self.assertLessEqual(fixation.duration, size * max_time)
        
if __name__ == '__main__':

    unittest.main()