import os
import tempfile
import tkinter as tk
import unittest
from pathlib import Path
from types import SimpleNamespace

import pymupdf

from copienator_gui.cut_helper import CutHelper, PAGE_GAP
from copienator_gui.manual_resolution import ManualResolutionPanel


@unittest.skipUnless(os.environ.get("DISPLAY"), "requires a display")
class CutHelperTests(unittest.TestCase):
    def test_cut_button_drag_to_page_gap_and_enter_only_produces_command(self):
        with tempfile.TemporaryDirectory() as temporary:
            directory = Path(temporary)
            source = directory / "Copies" / "Copie16" / "A.pdf"
            source.parent.mkdir(parents=True)
            with pymupdf.open() as document:
                for height in (200, 400):
                    page = document.new_page(width=300, height=height)
                    page.insert_text((20, 40), "Student answer")
                document.save(source)
            manual = directory / "manual_resolutions.txt"
            manual.write_text("Copie16 A -> B|\n")
            original = source.read_bytes()
            root = tk.Tk()
            try:
                panel = ManualResolutionPanel(root, lambda: directory)
                panel.pack()
                root.update()
                self.assertEqual(len(panel.cut_buttons), 1)
                panel.cut_buttons[0].invoke()
                helper = next(child for child in panel.winfo_children() if isinstance(child, CutHelper))
                helper.canvas.yview_moveto(0)
                root.update()
                helper.move_bar(SimpleNamespace(y=200 * helper.scale + PAGE_GAP / 2))
                self.assertIn("entre les pages 1 et 2", helper.caption.get())
                helper.keep.set(2)
                helper.mode.set("x")
                helper.focus_force()
                root.update()
                helper.event_generate("<Return>")
                root.update()
                self.assertFalse(helper.winfo_exists())
                self.assertEqual(panel.cut_result.get(), "Copie16 A c{33.333333}2x B|")
                panel.copy_cut_command()
                self.assertEqual(root.clipboard_get(), panel.cut_result.get())
                self.assertEqual(source.read_bytes(), original)
                self.assertEqual(manual.read_text(), "Copie16 A -> B|\n")
                panel.reload()
                self.assertEqual(len(panel.cut_buttons), 1)
            finally:
                root.destroy()