# Description: 
# 1. 读取指定文件夹下的所有txt文件
# 2. 逐行读取文件内容，根据一定规则过滤行
# 3. 一定概率将过滤后的文件写入新文件
# 4. 将其他未处理的文件移动到out文件夹
# 5. 输出日志
 
import os
import argparse
from datetime import datetime 
import re 
from pathlib import Path
import shutil

def list_files(dir_path):
    file_list = []
    for root, dirs, files in os.walk(dir_path):
        for file in files:
            file_list.append(os.path.join(root, file))
    return file_list


def get_files_in_directory(dir_path): 
    files_and_folders = os.listdir(dir_path)
 
    files = [file for file in files_and_folders if os.path.isfile(os.path.join(dir_path, file))]

    return files


def read_file_by_line(file_path):
    try:
        with open(file_path, 'r', errors='ignore') as file:
            lines = file.readlines()
            return lines
    except FileNotFoundError:
        print(f"文件 '{file_path}' 不存在")

summary_line_count = 0
catched_line_count = 0
handled_line_count = 0
handled_file_count = 0

lines_nessary_catched = []  
lines_optional_catched = []

is_missed = False
is_empty = False

def find_non_empty_line(lines, index, direction):
    if direction == 'next':
        step = 1
    elif direction == 'previous':
        step = -1
    else:
        return None

    new_index = index + step
    while new_index >= 0 and new_index < len(lines):
        if lines[new_index].strip() != '':
            return lines[new_index]
        new_index += step

    return None

def filter_lines(file_path, output_success_files):
    global summary_line_count 
    global lines_nessary_catched 
    global lines_optional_catched 
    global is_missed
    global is_empty

    if True:
        tags = ["图", "来源", "请参阅"]
        tail_tags = ["走势", "趋势"]
        except_signs = ['。','.....']
    else:
        tags = ["图", "来源"]
        tail_tags = []

        except_signs = []
    
    lines_nessary_catched = []
    lines_optional_catched = []

    lines = read_file_by_line(file_path)
    for line in lines:
        summary_line_count += 1 
        # 如果行中包含关键字
        for tag in tags:
           found = False
           if tag in line:
            # except_signs 不在其中，避免遗漏长文段内容与目录
            if not any(except_tag in line for except_tag in except_signs):
                found = True
                append_to_necessary_array(lines.index(line))
                break 
            if found:
                continue 
        for tail_tag in tail_tags:
            if line.endswith(tail_tag):
            # except_signs 不在其中，避免遗漏长文段内容与目录
                if not any(except_tag in line for except_tag in except_signs):
                    found = True 
                    append_to_necessary_array(lines.index(line)) 
                    break 
            if found:
                continue
        # 如果行是纯数字、带逗号的数字、带小数点的数字，或者是百分比数字，且上一个内容行或下一个内容行也满足条件，大概率是无意义内容，如果上下行是空格，则再往前或往后查询一行
        opt_regix = r'^[,\.\%-]*\d+[,\.\%-]*$'
        if re.match(opt_regix, line.strip()):
            index = lines.index(line)
            if index == 0:
                next_line = find_non_empty_line(lines, index, 'next')
                if next_line and re.match(opt_regix, next_line.strip()):
                    append_to_optional_array(index) 
                    continue 
            elif index == len(lines) - 1:
                previous_line = find_non_empty_line(lines, index, 'previous')
                if previous_line and re.match(opt_regix, previous_line.strip()):
                    append_to_optional_array(index) 
                    continue
            else:
                next_line = find_non_empty_line(lines, index, 'next')
                previous_line = find_non_empty_line(lines, index, 'previous')
                if (next_line and re.match(opt_regix, next_line.strip())) or (previous_line and re.match(opt_regix, previous_line.strip())):
                    append_to_optional_array(index) 
                    continue

    # 对 lines_optional_catched 和 lines_nessary_catched 进行去重
    lines_optional_catched = list(set(lines_optional_catched))
    lines_nessary_catched = list(set(lines_nessary_catched))

    if len(lines) > 0: 
        is_empty = False
        if(len(lines_optional_catched)/( len(lines)) >= 0.02):
            is_missed = True 
        else:
            is_missed = False
            delete_catched_lines(file_path, output_success_files)
    else:
        is_empty = True
        is_missed = True
    return set(lines_nessary_catched) | set(lines_optional_catched)

def remove_output_next_level(file_path):
    # 将文件路径转换为Path对象
    path = Path(file_path) 
    # 找到"output"在路径中的位置
    output_index = path.parts.index('output') 
    # 删除"output"后的一级结构
    new_parts = path.parts[:output_index+1] + path.parts[output_index+2:] 
    # 将新的路径部分连接起来
    new_path = Path(os.path.join(*new_parts)) 
    return str(new_path)

def delete_catched_lines(file_path, output_success_files):
    global lines_nessary_catched
    global handled_line_count
    global handled_file_count 
    global is_missed
    
    handled_file_count += 1
    handled_line_count += len(lines_nessary_catched)

    with open(file_path, 'r', errors='ignore') as file:
        read_lines = file.readlines()
        if len(read_lines) == 0:
            is_missed = True
            return  
        
    output_success_file = convert_with_relative_path(remove_output_next_level(file_path), output_success_files, False)
    lines = set(lines_nessary_catched) | set(lines_optional_catched)
    with open(output_success_file, 'w', errors='ignore') as file:
        for line in read_lines:
            if read_lines.index(line) not in lines:
                    file.write(line) 

    # 如果文件处理后为空，不保存这个文件
    if os.path.getsize(output_success_file) == 0:
        os.remove(output_success_file)
        is_missed = True
        print(f"文件 {file_path} 处理后为空，已删除\n")

def convert_with_relative_path(path, output_path, is_dir=True):
    global input_dir_path

    # Get the relative path of the file
    relative_path = os.path.relpath(path, os.path.dirname(input_dir_path))
    output_path = os.path.join(output_path, relative_path)

    # Create the directory if it does not exist
    if not os.path.exists(output_path):
        if is_dir:
            os.makedirs(output_path)
        else :
            os.makedirs(os.path.dirname(output_path), exist_ok=True)

    return output_path
    # shutil.copy(path, output_path)

def append_to_necessary_array(line):
    global catched_line_count
    global lines_nessary_catched 
    catched_line_count += 1
    lines_nessary_catched.append(line) 

def append_to_optional_array(line):
    global catched_line_count
    global lines_optional_catched
    catched_line_count += 1
    lines_optional_catched.append(line)

input_dir_path = ""

def process(dir_path, output_dir_path): 
    global is_missed
    global handled_file_count
    global input_dir_path

    input_dir_path = dir_path
    output_success_files = os.path.join(output_dir_path, "success_files")
    output_failed_files = os.path.join(output_dir_path, "failed_files")

    os.makedirs(output_dir_path, exist_ok=True)
    os.makedirs(output_failed_files, exist_ok=True)

    files = list_files(dir_path)  
    output_name = "filter_lines.txt"
     
    summary_file_count = 0
    catched_file_count = 0
    handled_file_count = 0    
    too_big_file_count = 0
    
    global catched_line_count

    collected_file_count = 0
    empty_file_count = 0

    output_path = os.path.join(output_dir_path, output_name)
    
    with open(os.path.join(dir_path, output_path) , "a") as output_txt:
        output_txt.write(f"{dir_path}\n")
        for file in files:
            if not file.endswith(".txt") and not os.path.basename(file).startswith("filter_lines"):
                continue    
            
            lines_catched = filter_lines(file, output_success_files) 
            summary_file_count += 1
            if is_empty:
                empty_file_count += 1
                print(f"文件 {file} 为空，当前 {empty_file_count} 个空文件\n")
                continue
            # 如果文件大于2M，直接处理为失败，过大的文件会引起超长时间的处理
            if os.path.getsize(file) > 2 * 1024 * 1024: 
                output_failed_file = convert_with_relative_path(remove_output_next_level(file), output_failed_files, False)
                # 将file复制到output_failed_files 
                shutil.copy(file, output_failed_file)
                summary_file_count += 1 
                too_big_file_count += 1
                print(f"文件 {file} 大于2M，不处理\n")
                continue   
            if lines_catched:
                catched_file_count += 1

                if is_missed:
                    output_failed_file = convert_with_relative_path(remove_output_next_level(file), output_failed_files, False)
                    # 将file复制到output_failed_files 
                    shutil.copy(file, output_failed_file)
                    
                    collected_file_count += 1
            # 每循环1000次，打印一次日志
            if summary_file_count % 1000 == 0:
                print(f"已扫描txt文件 {summary_file_count} 个，其中有问题的文件 {catched_file_count} 个，已处理 {handled_file_count} 个，已收集 {collected_file_count} 个问题文件。\n")
                print(f"已扫描行数 {summary_line_count} 行，其中有问题的行数 {catched_line_count} 行，已处理 {handled_line_count} 行\n")

        print(f"已扫描txt文件 {summary_file_count} 个，其中有问题的文件 {catched_file_count} 个，已处理 {handled_file_count} 个，已收集 {collected_file_count} 个问题文件。\n")
        print(f"已扫描行数 {summary_line_count} 行，其中有问题的行数 {catched_line_count} 行，已处理 {handled_line_count} 行\n")
        # 写入日志
        output_txt.write(f"\n===============================================\n \n")
        output_txt.write(f"已扫描文件 {summary_file_count} 个，其中有问题的文件 {catched_file_count} 个，已处理 {handled_file_count} 个，已收集 {collected_file_count} 个问题文件, 空文件 {empty_file_count} 个。\n \n")
        output_txt.write(f"已扫描行数 {summary_line_count} 行，其中有问题的行数 {catched_line_count} 行，已处理 {handled_line_count} 行\n \n")
        # 写入文件和行的处理率（已处理x / 有问题y）
        file_process_rate = 0
        line_process_rate = 0
        if catched_file_count > 0:
            file_process_rate = handled_file_count / catched_file_count
        if catched_line_count > 0:
            line_process_rate = handled_line_count / catched_line_count
        output_txt.write(f"文件处理率 {file_process_rate} 行处理率 {line_process_rate}\n \n")


if __name__ == "__main__":
    
    parser = argparse.ArgumentParser(description='批量转档程序')
    parser.add_argument("--input", type=str, nargs='+', help='输入文件夹根路径')
    parser.add_argument("--output", type=str, help='输出文件夹根路径')  

    args = parser.parse_args()

    if not args.input:
        parser.print_help()
     
    input_dir_paths = args.input
    output_dir_path = args.output
    for input_dir_path in input_dir_paths:
        process(input_dir_path, output_dir_path)