"""题目查询路由"""

from fastapi import APIRouter, Request, HTTPException, Query, Depends

from app.database import (
    get_connection, get_problem, search_problems, search_fts,
    update_problem_metadata, get_next_unannotated,
)
from app.routers.auth import verify_token
from app.services.renderer import render_docx_to_html

router = APIRouter(dependencies=[])


@router.get("/stats")
def get_stats(request: Request, _=Depends(verify_token)):
    """仪表盘统计"""
    from app.database import count_by_question_type, count_by_import_type, count_by_chapter
    config = request.app.state.config
    conn = get_connection(config.db_path)
    try:
        total_row = conn.execute("SELECT COUNT(*) FROM problems").fetchone()
        total = total_row[0] if total_row else 0
        return {
            "total": total,
            "by_question_type": count_by_question_type(conn),
            "by_import_type": count_by_import_type(conn),
            "by_chapter": count_by_chapter(conn),
        }
    finally:
        conn.close()


@router.get("/problems")
def list_problems(
    request: Request,
    chapter: str | None = Query(None),
    knowledge_code: str | None = Query(None),
    question_type: str | None = Query(None),
    import_type: str | None = Query(None),
    annotated: str | None = Query(None),
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=10000),
    _=Depends(verify_token),
):
    """题目列表（分页+筛选）"""
    config = request.app.state.config
    conn = get_connection(config.db_path)
    try:
        items, total = search_problems(
            conn, chapter=chapter, knowledge_code=knowledge_code,
            question_type=question_type, import_type=import_type,
            annotated=annotated, page=page, page_size=page_size
        )

        # Add body_preview for each item from FTS
        for item in items:
            row = conn.execute(
                "SELECT body FROM problems_fts WHERE problem_id = ?",
                (item["id"],)
            ).fetchone()
            if row and row["body"]:
                # Get first 80 chars, strip question number
                body = row["body"]
                # Strip question number like "1．"
                import re
                body = re.sub(r'^\d+[．.]\s*', '', body)
                item["body_preview"] = body[:80]
            else:
                item["body_preview"] = ""

        return {
            "items": items,
            "total": total,
            "page": page,
            "page_size": page_size,
        }
    finally:
        conn.close()


@router.get("/problems/{problem_id}")
def get_problem_detail(request: Request, problem_id: str, _=Depends(verify_token)):
    """题目详情（元数据 + 渲染 HTML）"""
    config = request.app.state.config
    conn = get_connection(config.db_path)
    try:
        problem = get_problem(conn, problem_id)
        if not problem:
            raise HTTPException(status_code=404, detail={
                "error": {"code": "not_found", "message": f"题目 {problem_id} 不存在"}
            })

        # 渲染 HTML
        docx_path = config.problems_dir / f"{problem_id}.docx"
        if docx_path.exists():
            problem["render_html"] = render_docx_to_html(docx_path, include_answer=True)
        else:
            problem["render_html"] = "<p>文件不存在</p>"

        return problem
    finally:
        conn.close()


@router.get("/problems/{problem_id}/render")
def render_problem(
    request: Request,
    problem_id: str,
    include_answer: bool = Query(True),
    _=Depends(verify_token),
):
    """渲染题目为 HTML（JSON 格式，用于 Android WebView）"""
    config = request.app.state.config
    docx_path = config.problems_dir / f"{problem_id}.docx"
    if not docx_path.exists():
        raise HTTPException(status_code=404, detail={
            "error": {"code": "not_found", "message": f"题目文件不存在: {problem_id}"}
        })

    html_fragment = render_docx_to_html(docx_path, include_answer=include_answer)
    full_html = _wrap_full_html(html_fragment, config.token)
    return {"html": full_html, "problem_id": problem_id}


@router.get("/problems/{problem_id}/view")
def view_problem(
    request: Request,
    problem_id: str,
    include_answer: bool = Query(True),
):
    """渲染题目为完整 HTML 页面（用 IFrame 加载，token 从 query string 获取）"""
    config = request.app.state.config
    token = request.query_params.get("token", "")
    if token != config.token:
        raise HTTPException(status_code=401, detail={
            "error": {"code": "unauthorized", "message": "Token 无效"}
        })

    docx_path = config.problems_dir / f"{problem_id}.docx"
    if not docx_path.exists():
        return _wrap_full_html("<p>题目文件不存在</p>", "")

    html_fragment = render_docx_to_html(docx_path, include_answer=include_answer)
    return HTMLResponse(content=_wrap_full_html(html_fragment, ""))


def _wrap_full_html(body: str, token: str = "") -> str:
    """将 pandoc HTML 片段包装成完整的 HTML 页面"""
    return f"""<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script>
  window.MathJax = {{
    tex: {{
      inlineMath: [['\\\\(', '\\\\)']],
      displayMath: [['\\\\[', '\\\\]']]
    }},
    svg: {{ fontCache: 'global' }}
  }};
</script>
<script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js" async></script>
<style>
  body {{
    font-family: '宋体', 'SimSun', 'Noto Serif CJK SC', 'STSong', serif;
    font-size: 18px;
    line-height: 2.0;
    color: #333;
    padding: 16px;
    max-width: 100%;
    overflow-x: hidden;
  }}
  img {{ max-width: 100%; height: auto; }}
  blockquote {{
    margin: 8px 0;
    padding: 4px 12px;
    border-left: 3px solid #e0e0e0;
    color: #555;
  }}
  p {{ margin: 6px 0; }}
</style>
</head>
<body>
{body}
<script>
  if (window.MathJax) {{
    MathJax.startup.promise.then(() => {{
      MathJax.typesetPromise();
    }});
  }}
</script>
</body>
</html>"""


from fastapi.responses import HTMLResponse


@router.get("/problems/next-unannotated")
def next_unannotated(
    request: Request,
    current_id: str | None = Query(None),
    direction: str = Query("next"),
    _=Depends(verify_token),
):
    """连续标注导航"""
    config = request.app.state.config
    conn = get_connection(config.db_path)
    try:
        problem = get_next_unannotated(conn, current_id, direction)
        return problem or {}
    finally:
        conn.close()


@router.put("/problems/{problem_id}/metadata")
def update_metadata(request: Request, problem_id: str, body: dict, _=Depends(verify_token)):
    """更新题目元数据"""
    config = request.app.state.config
    conn = get_connection(config.db_path)
    try:
        problem = get_problem(conn, problem_id)
        if not problem:
            raise HTTPException(status_code=404, detail={
                "error": {"code": "not_found", "message": f"题目 {problem_id} 不存在"}
            })

        update_problem_metadata(conn, problem_id, body)

        # 同时更新 docx 自定义属性
        docx_path = config.problems_dir / f"{problem_id}.docx"
        if docx_path.exists():
            _update_docx_props(docx_path, body)

        # 自动备份
        try:
            from app.services.backup import auto_backup
            auto_backup(config, changed_files=[str(config.problems_dir / f"{problem_id}.docx")])
        except Exception:
            pass

        return {"ok": True}
    finally:
        conn.close()


@router.put("/problems/{problem_id}/knowledge")
def update_knowledge(request: Request, problem_id: str, body: dict, _=Depends(verify_token)):
    """更新知识点编码"""
    config = request.app.state.config
    codes = body.get("knowledge_codes", [])
    conn = get_connection(config.db_path)
    try:
        problem = get_problem(conn, problem_id)
        if not problem:
            raise HTTPException(status_code=404, detail={
                "error": {"code": "not_found", "message": f"题目 {problem_id} 不存在"}
            })

        update_problem_metadata(conn, problem_id, {"knowledge_codes": codes})

        # 更新 docx 自定义属性
        import json
        docx_path = config.problems_dir / f"{problem_id}.docx"
        if docx_path.exists():
            _update_docx_props(docx_path, {"knowledge_codes": json.dumps(codes, ensure_ascii=False)})

        # 自动运行增量索引以更新章节
        from app.services.indexer import incremental_update
        incremental_update(config)

        # 自动备份
        try:
            from app.services.backup import auto_backup
            auto_backup(config, changed_files=[str(config.problems_dir / f"{problem_id}.docx")])
        except Exception:
            pass

        return {"ok": True}
    finally:
        conn.close()


@router.get("/search")
def search_problems_api(
    request: Request,
    q: str = Query(..., min_length=1),
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    _=Depends(verify_token),
):
    """全文搜索"""
    from app.services.search import search
    config = request.app.state.config
    return search(config, q, page, page_size)


def _update_docx_props(docx_path, fields: dict):
    """更新 docx 自定义属性"""
    from docx import Document
    import json
    try:
        doc = Document(str(docx_path))
        for key, value in fields.items():
            if isinstance(value, list):
                value = json.dumps(value, ensure_ascii=False)
            try:
                doc.custom_document_properties[key] = value
            except Exception:
                pass
        doc.save(str(docx_path))
    except Exception:
        pass