import os
import json

# 检查文件编码
def checkEncoding(filepath):
    with open(filepath, "rb") as encode_check:
        encoding = encode_check.readline(3)
    if encoding == b"\xfe\xff\x00":
        return "utf_16_be"
    elif encoding == b"\xff\xfe0":
        return "utf_16_le"
    else:
        return "utf_8"

# 读取文本文件
def readTextFile(filepath):
    if os.path.exists(filepath):
        file_encoding = checkEncoding(filepath)
        try:
            with open(filepath, "rt", encoding=file_encoding) as f_in:
                return f_in.readlines()
        except:
            with open(filepath, "rt", encoding="latin_1") as f_in:
                return f_in.readlines()
    return None

# 处理单个LDR文件数据
def process_ldr_data(lines, label_mapping, label_inverse_mapping, label_frequency, label_counter):
    # 定位main_section范围
    startLine = 0
    endLine = 0
    lineCount = 0
    foundEnd = False
    main_section_lines = []
    
    for line in lines:
        parameters = line.strip().split()
        if len(parameters) > 2:
            if parameters[0] == "0" and parameters[1] == "FILE":
                if not foundEnd:
                    endLine = lineCount
                    if endLine > startLine:
                        main_section_lines.extend(lines[startLine:endLine])
                        foundEnd = True
                        break
                startLine = lineCount
                foundEnd = False

            if parameters[0] == "0" and parameters[1] == "NOFILE":
                endLine = lineCount
                foundEnd = True
                main_section_lines.extend(lines[startLine:endLine])
                break
        lineCount += 1

    if not foundEnd:
        endLine = len(lines)
        if endLine > startLine:
            main_section_lines.extend(lines[startLine:endLine])
    
    # 处理main_section中1开头的行
    for line in main_section_lines:
        if line.startswith('1'):
            parts = line.split()
            if len(parts) >= 15:
                part_filename = parts[14]
                if ".DAT" in part_filename:
                    part_filename = part_filename.replace(".DAT", ".dat")
                
                if part_filename not in label_mapping:
                    label_mapping[part_filename] = label_counter
                    label_inverse_mapping[label_counter] = part_filename
                    label_counter += 1
                
                current_label = label_mapping[part_filename]
                label_frequency[current_label] = label_frequency.get(current_label, 0) + 1

    return label_mapping, label_inverse_mapping, label_frequency, label_counter

# 处理文件夹中所有LDR文件
def process_all_ldr_in_folder(folder_path):
    overall_label_mapping = {}
    overall_label_inverse_mapping = {}
    overall_label_frequency = {}
    label_counter = 0

    for root, dirs, files in os.walk(folder_path):
        for file in files:
            if file.lower().endswith('.ldr'):
                file_path = os.path.join(root, file)
                print(f"正在处理: {file_path}")
                
                lines = readTextFile(file_path)
                if lines is None:
                    print(f"⚠️  无法读取文件 {file_path}，已跳过")
                    continue
                
                overall_label_mapping, overall_label_inverse_mapping, overall_label_frequency, label_counter = process_ldr_data(
                    lines, overall_label_mapping, overall_label_inverse_mapping, overall_label_frequency, label_counter)

    return overall_label_mapping, overall_label_inverse_mapping, overall_label_frequency

# 保存映射表和按频率排序的频率表
def save_results(label_mapping, label_inverse_mapping, label_frequency, output_dir):
    os.makedirs(output_dir, exist_ok=True)
    
    # 保存标签映射表
    with open(os.path.join(output_dir, 'label_mapping.json'), 'w', encoding='utf-8') as f:
        json.dump(label_mapping, f, indent=4, ensure_ascii=False)
    
    # 保存反向标签映射表
    with open(os.path.join(output_dir, 'label_inverse_mapping.json'), 'w', encoding='utf-8') as f:
        json.dump(label_inverse_mapping, f, indent=4, ensure_ascii=False)
    
    # 准备频率数据并按使用次数排序（从高到低）
    frequency_list = []
    for label_id, count in label_frequency.items():
        frequency_list.append({
            "label_id": label_id,
            "part_name": label_inverse_mapping.get(label_id, "未知零件"),
            "usage_count": count
        })
    
    # 按使用次数降序排序
    frequency_list.sort(key=lambda x: x["usage_count"], reverse=True)
    
    # 保存排序后的频率表
    with open(os.path.join(output_dir, 'label_frequency.json'), 'w', encoding='utf-8') as f:
        json.dump(frequency_list, f, indent=4, ensure_ascii=False)

# 主程序
if __name__ == "__main__":
    INPUT_FOLDER = '/public/home/wangshuo/gap/assembly/data/car_1k/subset_self/ldr_l30_rotrans_expand_wom'
    OUTPUT_FOLDER = '/public/home/wangshuo/gap/assembly/data/car_1k/subset_self'

    label_mapping, label_inverse_mapping, label_frequency = process_all_ldr_in_folder(INPUT_FOLDER)
    
    save_results(label_mapping, label_inverse_mapping, label_frequency, OUTPUT_FOLDER)
    print(f"\n✅ 处理完成！结果已保存到: {OUTPUT_FOLDER}")
    print(f"📊 统计摘要:")
    print(f"   - 总唯一标签数: {len(label_mapping)}")
    print(f"   - 总使用次数: {sum(label_frequency.values())}")
    print(f"   - label_frequency.json已按使用频率从高到低排序")