# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2020, Kovid Goyal <kovid at kovidgoyal.net>
from __python__ import bound_methods, hash_literals

from dom import clear

def raise_fail(preamble, msg, call_site):
    if msg:
        msg = '. ' + msg
    else:
        msg = ''
    if call_site?.module_name:
        msg += f' [in module {call_site.module_name}:{call_site.line}:{call_site.col}]'
    raise AssertionError(preamble + msg)


def repr_of(a):
    if not a:
        return a
    q = a.outerHTML
    if q:
        return q.split('>')[0] + '>'
    if a.nodeType is Node.TEXT_NODE:
        return repr(a.nodeValue)
    return str(a)


def assert_equal(a, b, msg, call_site=None):

    def fail():
        ra = repr_of(a)
        rb = repr_of(b)
        p = f'{ra} != {rb}'
        raise_fail(p, msg, call_site)

    atype = jstype(a)
    btype = jstype(b)
    base_types = {'number': True, 'boolean': True, 'string': True, 'undefined': True}
    if base_types[atype] or base_types[btype] or a is None or b is None:
        if a is not b:
            fail()
        return
    if a.__eq__:
        if not a.__eq__(b):
            fail()
        return
    if a.isSameNode:
        if not a.isSameNode(b):
            fail()
        return
    if b.__eq__:
        if not b.__eq__(a):
            fail()
        return
    if b.isSameNode:
        if not b.isSameNode(a):
            fail()
        return
    if a.length? or b.length?:
        if a.length is not b.length:
            fail()
        for i in range(a.length):
            assert_equal(a[i], b[i])
        return
    if atype is 'object':
        for key in Object.keys(a):
            assert_equal(a[key], b[key])
    if btype is 'object':
        for key in Object.keys(b):
            assert_equal(a[key], b[key])

    if atype is not 'object' and btype is not 'object':
        fail()


def assert_true(x, msg, call_site=None):
    if not x:
        raise_fail(f'{x} is not truthy', msg, call_site)


def assert_false(x, msg, call_site=None):
    if x:
        raise_fail(f'{x} is truthy', msg, call_site)


def reset_dom():
    html = document.documentElement
    clear(html)
    head = document.createElement('head')
    body = document.createElement('body')
    html.appendChild(head)
    html.appendChild(body)


registered_tests = {}


def test(f):
    mod = f.__module__ or 'unknown_test_module'
    f.test_name = mod + '.' + f.name
    registered_tests[f.test_name] = f
    return f