"""网页生成器 — 读取数据库，生成静态 HTML 展示页面。"""

import os
import json
import db

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
TEMPLATE_PATH = os.path.join(BASE_DIR, "templates", "index.html")
STYLE_PATH = os.path.join(BASE_DIR, "static", "style.css")
OUTPUT_DIR = os.path.join(BASE_DIR, "output")
OUTPUT_PATH = os.path.join(OUTPUT_DIR, "index.html")


def _escape(text):
    """简单的 HTML 转义。"""
    if not text:
        return ""
    return (str(text)
            .replace("&", "&")
            .replace("<", "&lt;")
            .replace(">", "&gt;")
            .replace('"', "&quot;"))


def _render_book_card(book):
    """渲染单本书的 HTML 卡片。"""
    cover = book.get("cover_url") or ""
    cover_html = (f'<img class="card-cover" src="{_escape(cover)}" alt="封面" loading="lazy">'
                  if cover
                  else '<div class="card-cover card-cover--placeholder">📖</div>')

    rating_html = ""
    if book.get("rating"):
        stars = "★" * book["rating"] + "☆" * (5 - book["rating"])
        rating_html = f'<div class="card-rating personal">{stars}</div>'

    scores = []
    if book.get("douban_score"):
        scores.append(f'<span class="score douban">豆瓣 {book["douban_score"]}</span>')
    if book.get("goodreads_score"):
        scores.append(f'<span class="score goodreads">GR {book["goodreads_score"]}</span>')
    scores_html = f'<div class="card-scores">{"".join(scores)}</div>' if scores else ""

    tags_html = ""
    if book.get("tags"):
        tag_spans = "".join(
            f'<span class="tag" data-tag="{_escape(t.strip())}">{_escape(t.strip())}</span>'
            for t in book["tags"].split(",") if t.strip()
        )
        tags_html = f'<div class="card-tags">{tag_spans}</div>'

    meta_parts = []
    if book.get("author"):
        meta_parts.append(f'{_escape(book["author"])}')
    if book.get("translator"):
        meta_parts.append(f'译: {_escape(book["translator"])}')
    if book.get("publisher"):
        meta_parts.append(f'{_escape(book["publisher"])}')
    if book.get("pub_date"):
        meta_parts.append(f'{_escape(book["pub_date"])}')
    meta_html = f'<div class="card-meta">{" · ".join(meta_parts)}</div>' if meta_parts else ""

    notes_html = ""
    if book.get("notes"):
        notes_html = f'<div class="card-notes">{_escape(book["notes"])}</div>'

    dates = []
    if book.get("start_date"):
        dates.append(f'开始: {_escape(book["start_date"])}')
    if book.get("finish_date"):
        dates.append(f'完成: {_escape(book["finish_date"])}')
    dates_html = f'<div class="card-dates">{" · ".join(dates)}</div>' if dates else ""

    format_badge = "📱 电子书" if book.get("format") == "ebook" else "📕 纸质书"

    return f"""
    <div class="book-card" data-status="{_escape(book.get('status', ''))}"
         data-format="{_escape(book.get('format', ''))}"
         data-tags="{_escape(book.get('tags', ''))}">
        {cover_html}
        <div class="card-body">
            <h3 class="card-title">{_escape(book.get('title', ''))}</h3>
            {meta_html}
            {rating_html}
            {scores_html}
            {tags_html}
            {notes_html}
            {dates_html}
            <div class="card-format">{format_badge}</div>
        </div>
    </div>"""


def build():
    """生成静态 HTML 页面，返回输出路径。"""
    os.makedirs(OUTPUT_DIR, exist_ok=True)

    books = db.list_books()
    stats = db.get_stats()
    all_tags = db.get_all_tags()

    cards_html = "\n".join(_render_book_card(b) for b in books)

    # 读取 CSS
    with open(STYLE_PATH, "r", encoding="utf-8") as f:
        css = f.read()

    # 读取模板并填充
    with open(TEMPLATE_PATH, "r", encoding="utf-8") as f:
        template = f.read()

    # 统计数据
    total = stats["total"]
    reading = stats["by_status"].get("reading", 0)
    read = stats["by_status"].get("read", 0)
    to_read = stats["by_status"].get("to-read", 0)
    paper = stats["by_format"].get("paper", 0)
    ebook = stats["by_format"].get("ebook", 0)

    # 标签按钮
    tag_buttons = "".join(
        f'<button class="tag-btn" data-tag="{_escape(t)}">{_escape(t)}</button>'
        for t in all_tags
    )

    html = (template
            .replace("{{CSS}}", css)
            .replace("{{TOTAL}}", str(total))
            .replace("{{READING}}", str(reading))
            .replace("{{READ}}", str(read))
            .replace("{{TO_READ}}", str(to_read))
            .replace("{{PAPER}}", str(paper))
            .replace("{{EBOOK}}", str(ebook))
            .replace("{{TAG_BUTTONS}}", tag_buttons)
            .replace("{{BOOK_CARDS}}", cards_html))

    with open(OUTPUT_PATH, "w", encoding="utf-8") as f:
        f.write(html)

    # 复制封面图片不处理（直接使用 URL）
    return OUTPUT_PATH