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"""Tests from interaction state machines"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "18/02/2016"


import unittest

from silx.gui.plot import Interaction


class TestInteraction(unittest.TestCase):
    def testClickOrDrag(self):
        """Minimalistic test for click or drag state machine."""
        events = []

        class TestClickOrDrag(Interaction.ClickOrDrag):
            def click(self, x, y, btn):
                events.append(("click", x, y, btn))

            def beginDrag(self, x, y, btn):
                events.append(("beginDrag", x, y, btn))

            def drag(self, x, y, btn):
                events.append(("drag", x, y, btn))

            def endDrag(self, start, end, btn):
                events.append(("endDrag", start, end, btn))

        clickOrDrag = TestClickOrDrag()

        # click
        clickOrDrag.handleEvent("press", 10, 10, Interaction.LEFT_BTN)
        self.assertEqual(len(events), 0)

        clickOrDrag.handleEvent("release", 10, 10, Interaction.LEFT_BTN)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0], ("click", 10, 10, Interaction.LEFT_BTN))

        # drag
        events = []
        clickOrDrag.handleEvent("press", 10, 10, Interaction.LEFT_BTN)
        self.assertEqual(len(events), 0)
        clickOrDrag.handleEvent("move", 15, 10)
        self.assertEqual(len(events), 2)  # Received beginDrag and drag
        self.assertEqual(events[0], ("beginDrag", 10, 10, Interaction.LEFT_BTN))
        self.assertEqual(events[1], ("drag", 15, 10, Interaction.LEFT_BTN))
        clickOrDrag.handleEvent("move", 20, 10)
        self.assertEqual(len(events), 3)
        self.assertEqual(events[-1], ("drag", 20, 10, Interaction.LEFT_BTN))
        clickOrDrag.handleEvent("release", 20, 10, Interaction.LEFT_BTN)
        self.assertEqual(len(events), 4)
        self.assertEqual(
            events[-1], ("endDrag", (10, 10), (20, 10), Interaction.LEFT_BTN)
        )
