#!/usr/bin/env python
# License: GPLv3 Copyright: 2022, Kovid Goyal <kovid at kovidgoyal.net>


import json
import os
import shlex
import subprocess
import tempfile

from kitty.constants import kitty_tool_exe as kitty_tool

from . import BaseTest


class TestCompletion(BaseTest):

    def test_completion(self):
        with tempfile.TemporaryDirectory() as tdir:
            completion(self, tdir)


def has_words(*words):
    def t(self, result):
        q = set(words)
        for group in result.get('groups', ()):
            for m in group['matches']:
                if m['word'] in words:
                    q.discard(m['word'])
        self.assertFalse(q, f'Command line: {self.current_cmd!r}')
    return t


def all_words(*words):
    def t(self, result):
        expected = set(words)
        actual = set()

        for group in result.get('groups', ()):
            for m in group['matches']:
                actual.add(m['word'])
        self.assertEqual(expected, actual, f'Command line: {self.current_cmd!r}')
    return t


def completion(self: TestCompletion, tdir: str):
    all_cmds = []
    all_argv = []
    all_tests = []

    def add(cmdline: str, *tests):
        all_cmds.append(cmdline)
        new_word = cmdline.endswith(' ')
        if new_word:
            cmdline = cmdline[:-1]
        all_argv.append(shlex.split(cmdline))
        if new_word:
            all_argv[-1].append('')
        all_tests.append(tests)

    def run_tool():
        env = os.environ.copy()
        env['PATH'] = os.path.join(tdir, 'bin')
        cp = subprocess.run(
            [kitty_tool(), '__complete__', 'json'],
            check=True, stdout=subprocess.PIPE, cwd=tdir, input=json.dumps(all_argv).encode(), env=env
        )
        self.assertEqual(cp.returncode, 0, f'kitty-tool __complete__ failed with exit code: {cp.returncode}')
        return json.loads(cp.stdout)

    add('kitty ', has_words('@', '@ls'))
    add('kitty @ l', has_words('ls', 'last-used-layout', 'launch'))
    add('kitty @l', has_words('@ls', '@last-used-layout', '@launch'))

    def make_file(path, mode=None):
        with open(os.path.join(tdir, path), mode='x') as f:
            if mode is not None:
                os.chmod(f.fileno(), mode)

    os.mkdir(os.path.join(tdir, 'bin'))
    os.mkdir(os.path.join(tdir, 'sub'))
    make_file('bin/exe1', 0o700)
    make_file('bin/exe-not1')
    make_file('exe2', 0o700)
    make_file('exe-not2')
    make_file('sub/exe3', 0o700)
    make_file('sub/exe-not3')

    add('kitty x', all_words())
    add('kitty e', all_words('exe1'))
    add('kitty ./', all_words('./bin', './bin/exe1', './sub', './exe2', './sub/exe3'))
    add('kitty ./e', all_words('./exe2'))
    add('kitty ./s', all_words('./sub', './sub/exe3'))

    for cmd, tests, result in zip(all_cmds, all_tests, run_tool()):
        self.current_cmd = cmd
        for test in tests:
            test(self, result)