import json
import fitz  # PyMuPDF
import os
import fitz
from collections import Counter
import uuid
import re
def safe_json_loads(s: str):
    try:
        return json.loads(s)
    except json.JSONDecodeError as e:
        # 尝试修复常见问题
        s = s.replace("\\n", "\\\n").replace("\r", "\\r").replace("\t", "\\t")
        # 或者直接清理非法字符
        s = re.sub(r'[\x00-\x1f\x7f]', '', s)  # 移除控制字符
        try:
            return json.loads(s)
        except:
            raise e
        
def highlight_pdf_file(input_pdf_path, highlights, color=(1, 1, 0)):
    """
    在单个 PDF 文件的多个位置添加高亮注释，并返回处理后路径及最常出现的 page_idx。

    :param input_pdf_path: 输入 PDF 文件路径（字符串）
    :param highlights: 高亮区域列表，每个元素为 dict，格式：
                       {"page_idx": int, "bbox": [x0, y0, x1, y1]}
    :param output_dir: 输出目录路径。若为 None，则使用输入文件所在目录。
    :param color: 高亮颜色，RGB 元组，范围 0~1，例如黄色 (1, 1, 0)
    :return: tuple (output_pdf_path: str, most_common_page: int or None)
    """
    unique_id = uuid.uuid4()

    if not highlights:
        print("⚠️ 无高亮区域，跳过处理。")
        return input_pdf_path, None,None

    # 提取所有有效的 page_idx 用于统计
    valid_page_indices = []

    # 打开 PDF
    doc = fitz.open(input_pdf_path)

    for item in highlights:
        page_idx = item.get("page_idx")
        bbox = item.get("bbox")

        # 基本校验
        if page_idx is None or bbox is None:
            print(f"⚠️ 跳过高亮项（缺少 page_idx 或 bbox）: {item}")
            continue
        if not (0 <= page_idx < doc.page_count):
            print(f"⚠️ 页面索引 {page_idx} 超出范围（总页数: {doc.page_count}），跳过。")
            continue
        if len(bbox) != 4:
            print(f"⚠️ bbox 格式错误（需 [x0,y0,x1,y1]）: {bbox}，跳过。")
            continue

        try:
            page = doc[page_idx]
            highlight_annot = page.add_highlight_annot(bbox)
            highlight_annot.set_colors(stroke=color)
            highlight_annot.update()
            valid_page_indices.append(page_idx)  # 记录成功处理的 page_idx
        except Exception as e:
            print(f"❌ 在 page={page_idx}, bbox={bbox} 添加高亮失败: {e}")

    # 确定输出路径
    filename = os.path.basename(input_pdf_path)
    base, ext = os.path.splitext(filename)
    output_dir = "/app/files/uploads_v1"

    output_pdf_path = os.path.join(output_dir, f"{base}_{unique_id}{ext}")
    highlight_filename = f"{base}_{unique_id}{ext}"
    # 保存 PDF
    doc.save(output_pdf_path, garbage=3, deflate=True)
    doc.close()

    print(f"✅ 高亮完成！已保存至: {output_pdf_path}")

    # 统计最常出现的 page_idx
    most_common_page = None
    if valid_page_indices:
        counter = Counter(valid_page_indices)
        most_common_page, _ = counter.most_common(1)[0]

    return highlight_filename, most_common_page,filename


def get_content_bbox(data):
    content = ""
    highlight_list = []
    for ins in data:
        if "type" not in ins:
            continue

        if ins["type"] == "text":
            text_content = ins.get("text", "")
            content += text_content + "\n"
            bbox = ins.get("bbox", [])
            page_idx = ins.get("page_idx", -1)
            highlight_list.append({
                "page_idx": page_idx,
                "bbox": bbox
            })

        elif ins["type"] == "table":
            table_caption = ins.get("table_caption")
            table_body = ins.get("table_body")

            # 处理 table_caption：可能是 list 或 str
            caption_str = ""
            if table_caption:
                if isinstance(table_caption, list):
                    caption_str = "\n".join(str(c) for c in table_caption)
                else:
                    caption_str = str(table_caption)

            content += caption_str + "\n" + (table_body or "") + "\n"
            bbox = ins.get("bbox", [])
            page_idx = ins.get("page_idx", -1)
            highlight_list.append({
                "page_idx": page_idx,
                "bbox": bbox
            })

        elif ins["type"] == "image":
            image_caption = ins.get("image_caption", "")
            img_path = ins.get("img_path", "")

            # 关键修复：处理 image_caption 可能是 list 的情况
            if isinstance(image_caption, list):
                image_caption = "\n".join(str(item) for item in image_caption)
            elif not isinstance(image_caption, str):
                image_caption = str(image_caption)

            if isinstance(img_path, list):
                img_path = "\n".join(str(p) for p in img_path)
            elif not isinstance(img_path, str):
                img_path = str(img_path)

            if image_caption or img_path:
                content += image_caption + "\n" + img_path + "\n"
                bbox = ins.get("bbox", [])
                page_idx = ins.get("page_idx", -1)
                highlight_list.append({
                    "page_idx": page_idx,
                    "bbox": bbox
                })
        else:
            continue

    return content, highlight_list