"""Builds an independent word bank: CEFR-J decides which words and at what
level, the downloaded word books supply the IPA and the Chinese gloss.

CEFR-J carries no glosses at all, so nothing here overrides it -- a word only
enters the bank if the level pool already contains it.
"""
import csv, glob, json, os, re, sys
import openpyxl

POOLS = '/Users/shenlei/Work/English/kouyu_english/tool/courses/pools'

# The books write parts of speech as `n.` / `vt.`; CEFR-J spells them out.
POS_MAP = {
    'n': 'noun', 'pron': 'pronoun', 'v': 'verb', 'vt': 'verb', 'vi': 'verb',
    'aux': 'verb', 'modal': 'verb', 'adj': 'adjective', 'adv': 'adverb',
    'prep': 'preposition', 'conj': 'conjunction', 'art': 'determiner',
    'det': 'determiner', 'num': 'number', 'int': 'interjection',
}


def load_pool():
    """{word form: (headword, pos set, level)} for A1..B1, content words only."""
    pool = {}
    for level in ('A1', 'A2', 'B1'):
        for row in csv.DictReader(open(f'{POOLS}/{level.lower()}-word-pool.csv')):
            if row.get('status') != 'pool' or row.get('function_word') == 'yes':
                continue
            head = row['headword'].strip()
            for form in re.split(r'[/,]', head):
                form = form.strip().lower()
                if not form:
                    continue
                entry = pool.setdefault(form, {'headword': head, 'pos': set(), 'level': level})
                if row.get('pos'):
                    entry['pos'].add(row['pos'].strip())
    return pool


def clean_gloss(raw, wanted_pos):
    """Picks one part of speech out of a stacked gloss and splits it into senses a
    beginner needs. The books ship dictionary dumps: `apple` arrives as
    "苹果，苹果树，苹果似的东西；[美俚]炸弹，手榴弹..."."""
    if not raw:
        return ''
    lines = [l.strip() for l in str(raw).split('\n') if l.strip()]
    picked = None
    for line in lines:
        m = re.match(r'^([a-z]+)\.\s*(.+)$', line, re.I)
        if not m:
            continue
        pos = POS_MAP.get(m.group(1).lower())
        if pos and wanted_pos and pos in wanted_pos:
            picked = m.group(2)
            break
        if picked is None:
            picked = m.group(2)
    if picked is None:
        picked = lines[0]
    senses = []
    for sense in re.split(r'[；;]', picked):
        sense = sense.strip()
        # `[美俚]炸弹` and `<美>支票` are register labels on a sense a learner
        # will never need; drop the whole sense, not just the label.
        if re.match(r'^\s*[\[<【]', sense):
            continue
        sense = re.sub(r'[（(][^）)]*[）)]', '', sense)
        sense = re.sub(r'[\[【][^\]】]*[\]】]', '', sense)
        # "苹果，苹果树，苹果似的东西" is one sense listed three ways.
        sense = re.split(r'[，,]', sense)[0].strip(' 。.、')
        if sense:
            senses.append(sense)
    return list(dict.fromkeys(senses))[:3]


def main():
    pool = load_pool()
    bank, seen, skipped = {}, 0, 0
    for path in sorted(glob.glob('src/*.xlsx')):
        source = os.path.basename(path)
        wb = openpyxl.load_workbook(path, read_only=True)
        for row in wb.worksheets[0].iter_rows(min_row=2, values_only=True):
            if not row or not row[0]:
                continue
            seen += 1
            word = str(row[0]).strip()
            key = word.lower()
            hit = pool.get(key)
            if hit is None:
                skipped += 1
                continue
            senses = clean_gloss(row[3] if len(row) > 3 else '', hit['pos'])
            if not senses:
                skipped += 1
                continue
            uk = str(row[1] or '').strip()
            us = str(row[2] or '').strip()
            prev = bank.get(key)
            # Keep the first hit, but let a later book fill in a missing IPA.
            if prev:
                if not prev['ipa'] and (us or uk):
                    prev['ipa'] = us or uk
                continue
            bank[key] = {
                'id': 'V-' + re.sub(r'[^a-z0-9]+', '-', key).strip('-'),
                'en': word,
                # One sense is what a quiz option should say; the rest are kept
                # for the word's detail line.
                'zh': senses[0],
                'more': '；'.join(senses[1:]),
                'ipa': us or uk,
                'level': hit['level'], 'source': source,
            }
        wb.close()

    out = [bank[k] for k in sorted(bank)]
    json.dump(out, open('wordbank.json', 'w'), ensure_ascii=False, indent=1)

    from collections import Counter
    by_level = Counter(w['level'] for w in out)
    print(f'读入词条 {seen}，未匹配/丢弃 {skipped}')
    print(f'词库产出 {len(out)}  ' + '  '.join(f'{k} {by_level[k]}' for k in ('A1', 'A2', 'B1')))
    for level in ('A1', 'A2', 'B1'):
        total = len({f for f, v in pool.items() if v['level'] == level})
        print(f'  {level} 词池覆盖 {by_level[level]}/{total} = {by_level[level]/total:.0%}')
    print(f'  无音标 {sum(1 for w in out if not w["ipa"])}')
    print('\n样例:')
    for w in out[:8]:
        print(f'  {w["en"]:12} {w["ipa"]:18} {w["zh"]:10} [{w["level"]}] {w["more"]}')


main()