"""初稿 HTML 预览组装。

与 Word 初稿同构内容写入 `{skill_data}/html/draft-{id}.html`，宿主侧栏可预览；
重建走固定 Action id `render-html`（按台账全量重建，与生成时同一内核）。
"""

from __future__ import annotations

from typing import Any

from service.html_page_service import load_html_template, render_html_placeholders, write_html_page
from util.logging_config import get_skill_logger

_TEMPLATE_REL = "assets/html/draft-preview.html"


def _log():
    try:
        return get_skill_logger()
    except RuntimeError:
        return None


def _esc(value: Any) -> str:
    import html

    return html.escape(str(value if value is not None else "—"), quote=True)


def _sections_html(sections: dict[str, list[str]]) -> str:
    parts = []
    for title, paragraphs in (sections or {}).items():
        items = "".join(f"<p class='para{' placeholder' if p.startswith('[待补充') else ''}'>{_esc(p)}</p>" for p in paragraphs)
        parts.append(f"<div class='section'><h2>{_esc(title)}</h2>{items}</div>")
    return "".join(parts)


def build_preview_html(draft: dict[str, Any]) -> str:
    body = f"""
    <div class="verdict-line">
      <span class="tag tier-info">初稿</span>
      <span class="muted">项目 {_esc(draft.get("project_no"))} · 批次 {_esc(draft.get("batch_no"))}</span>
    </div>
    <div class="section"><h2>生成说明</h2>
      <p class="para">数据章节（完成情况/决算/成果清单）由台账自动生成，请逐项核对；叙事章节仅提供素材要点，须由项目负责人本人终审。</p>
    </div>
    {_sections_html(draft.get("sections") or {})}
    <footer>本预览与 Word 初稿同构；严禁引入台账之外的成果或结论。以本单位结题报告模板为准。</footer>
    """
    template = load_html_template(_TEMPLATE_REL)
    return render_html_placeholders(
        template,
        {
            "TITLE": f"结题报告初稿预览 · {draft.get('project_name') or draft.get('project_no') or ''}",
            "GENERATED_AT": "",
            "BODY": body,
        },
    )


def write_preview_for_kernel(*, draft: dict[str, Any], draft_id: int) -> str:
    """生成期写预览：按初稿记录编号命名，多次生成互不覆盖。"""
    html_text = build_preview_html(draft)
    log = _log()
    path = write_html_page(f"draft-{draft_id}.html", html_text)
    if log:
        log.info("draft_preview_written draft_id=%s project_no=%s path=%s stage=report", draft_id, draft.get("project_no"), path)
    return path


def build_preview_for_draft_id(draft_id: int) -> str:
    """按初稿记录 id 从台账全量重建 HTML 预览（与 Word 初稿同构，含决算/成果/占位章节）。"""
    from db.connection import get_conn
    from service.draft_service import build_draft_sections, query_pending_projects
    from service.ledger_service import list_achievements, list_expenses

    log = _log()
    if log:
        log.info("preview_render_start draft_id=%s stage=render", draft_id)
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT * FROM report_drafts WHERE id = ?", (draft_id,))
        row = cur.fetchone()
        if not row:
            raise ValueError(f"初稿记录不存在：{draft_id}")
        columns = [d[0] for d in cur.description]
        record = dict(zip(columns, row))
    finally:
        conn.close()

    project_no = str(record.get("project_no") or "")
    projects = query_pending_projects(project_no=project_no)
    project = projects[0] if projects else {
        "project_no": project_no,
        "project_name": str(record.get("project_name") or ""),
    }
    sections_data = build_draft_sections(
        project,
        list_achievements(project_no),
        list_expenses(project_no),
    )
    draft = {
        "project_no": project_no,
        "project_name": str(project.get("project_name") or record.get("project_name") or ""),
        "batch_no": str(record.get("batch_no") or ""),
        "sections": sections_data["sections"],
    }
    html_text = build_preview_html(draft)
    path = write_html_page(f"draft-{draft_id}.html", html_text)
    if log:
        log.info("preview_render_done draft_id=%s path=%s stage=render", draft_id, path)
    return path