"""Execute real option-title call sites, coordinate transform and font metrics."""
import argparse
import unittest
from unicorn import UC_HOOK_CODE
from unicorn.x86_const import UC_X86_REG_EAX, UC_X86_REG_ECX, UC_X86_REG_EDI, UC_X86_REG_ESP, UC_X86_REG_EIP
import test_cjk_layout as engine

# From the source string's lookup return to the original draw return.
TITLE_SITES = [(0x4de8b7, 0x4de8e7), (0x4d747b, 0x4d74ab),
               (0x4ddaa3, 0x4ddad3), (0x4d9a0b, 0x4d9a3b)]


def title_position(site, text, resolution):
    uc, put, ints, font, stack, string, stop = engine.make_machine()
    manager = font - 0x3a8
    put(0x65af70, 0x2001000)
    put(0x2001008, 0x2002000)
    put(0x200105c, manager)
    put(0x2002514, *resolution)
    uc.mem_write(string, text.encode('gb2312') + b'\0')
    uc.reg_write(UC_X86_REG_ESP, stack)
    uc.reg_write(UC_X86_REG_EAX, string)
    uc.reg_write(UC_X86_REG_EDI, manager)
    uc.reg_write(UC_X86_REG_ECX, manager)
    # The caller pushed justification=0 before looking up its title.
    put(stack, 0)
    positions = []
    def draw(machine, address, size, data):
        sp = machine.reg_read(UC_X86_REG_ESP)
        ret, point = ints(sp, 2)
        positions.append(ints(point, 2))
        machine.reg_write(UC_X86_REG_ESP, sp + 24)
        machine.reg_write(UC_X86_REG_EIP, ret)
    uc.hook_add(UC_HOOK_CODE, draw, begin=0x4eab70, end=0x4eab70)
    uc.emu_start(site[0], site[1], count=10000)
    assert uc.reg_read(UC_X86_REG_EIP) == site[1]
    return positions


class TitleTests(unittest.TestCase):
    def test_all_option_titles_share_panel_center(self):
        for site in TITLE_SITES:
            for label, x in [('操作', 628), ('游戏选项', 616), ('Controls', 608)]:
                with self.subTest(site=hex(site[0]), label=label):
                    self.assertEqual(title_position(site, label, (800, 600)), [(x, 60)])

    def test_title_center_tracks_resolution_without_scaling_font_width(self):
        for resolution, expected in [((1280, 720), (1012, 72)),
                                     ((1920, 1080), (1524, 108))]:
            with self.subTest(resolution=resolution):
                self.assertEqual(title_position(TITLE_SITES[0], '操作', resolution), [expected])


if __name__ == '__main__':
    p = argparse.ArgumentParser()
    p.add_argument('--exe', default=engine.DEFAULT_EXE)
    args, rest = p.parse_known_args()
    engine.EXE_PATH = args.exe
    unittest.main(argv=[__file__] + rest)