from collections import Counter
from pathlib import Path
import re


REPO = Path(__file__).resolve().parent.parent


def read(path: Path) -> str:
    return path.read_text(encoding="utf-8")


def extract_locale_block(src: str, locale_key: str) -> str:
    start_match = re.search(rf"\b{re.escape(locale_key)}\s*:\s*\{{", src)
    assert start_match, f"{locale_key} locale block not found"

    start = start_match.end() - 1  # "{"
    depth = 0
    in_single = False
    in_double = False
    in_backtick = False
    escape = False

    for i in range(start, len(src)):
        ch = src[i]

        if escape:
            escape = False
            continue

        if in_single:
            if ch == "\\":
                escape = True
            elif ch == "'":
                in_single = False
            continue

        if in_double:
            if ch == "\\":
                escape = True
            elif ch == '"':
                in_double = False
            continue

        if in_backtick:
            if ch == "\\":
                escape = True
            elif ch == "`":
                in_backtick = False
            continue

        if ch == "'":
            in_single = True
            continue
        if ch == '"':
            in_double = True
            continue
        if ch == "`":
            in_backtick = True
            continue

        if ch == "{":
            depth += 1
            continue
        if ch == "}":
            depth -= 1
            if depth == 0:
                return src[start + 1 : i]

    raise AssertionError(f"{locale_key} locale block braces are not balanced")


def test_chinese_locale_block_exists():
    src = read(REPO / "static" / "i18n.js")
    assert "\n  zh: {" in src
    assert "_lang: 'zh'" in src
    assert "_speech: 'zh-CN'" in src


def test_chinese_locale_includes_representative_translations():
    src = read(REPO / "static" / "i18n.js")
    expected = [
        "settings_title: '\\u8bbe\\u7f6e'",
        "login_title: '\\u767b\\u5f55'",
        "approval_heading: '需要审批'",
        "tab_tasks: '任务'",
        "tab_profiles: '配置'",
        "session_time_just_now: '刚刚'",
        "onboarding_title: '欢迎使用 Hermes Web UI'",
        "onboarding_complete: '引导完成'",
    ]
    for entry in expected:
        assert entry in src


def test_chinese_locale_covers_english_keys():
    src = read(REPO / "static" / "i18n.js")
    key_pattern = re.compile(r"^\s{4}([a-zA-Z0-9_]+):", re.MULTILINE)
    en_keys = set(key_pattern.findall(extract_locale_block(src, "en")))
    zh_keys = set(key_pattern.findall(extract_locale_block(src, "zh")))

    missing = sorted(en_keys - zh_keys)
    assert not missing, f"Chinese locale missing keys: {missing}"


def test_chinese_locale_has_no_duplicate_keys():
    src = read(REPO / "static" / "i18n.js")
    key_pattern = re.compile(r"^\s{4}([a-zA-Z0-9_]+):", re.MULTILINE)
    keys = key_pattern.findall(extract_locale_block(src, "zh"))
    duplicates = sorted(k for k, count in Counter(keys).items() if count > 1)
    assert not duplicates, f"Chinese locale has duplicate keys: {duplicates}"