import os, sys
import numpy as np
import time
from datetime import datetime

def file_fliter(folder:str, file_ext:str, sort_format = None):

    files_List = os.listdir(folder)
    target_files = []

    # flitered by file extention name
    for file in files_List:
        if file.split('.')[-1] == file_ext:
            target_files.append(file)

    if sort_format is not None:
        # sort the list by the sort_format
        target_files.sort(key=sort_format)

    return target_files

def get_skip_rows(path):
    with open(path,"r") as ply_file:
        count = 0
        # read the line
        for line in ply_file.readlines():
            # strip the str of the header
            flag = line.strip()
            if  flag == "end_header":
                return count + 1
            else:
                if count >= 50:
                    return None
                count += 1
    return None

def read_ply(path:str):
    start_line = get_skip_rows(path)
    if start_line is not None:
        ply_array = np.loadtxt(path,skiprows=start_line)
    else:
        ply_array = None
    return ply_array


def write_ply(data:np.array,folder:str,name:str):
    file = os.path.join(folder,name+".ply")
    n_p = data.shape[0]
    n_cols = data.shape[1]

    if n_cols == 3:
        header = ["ply\nformat ascii 1.0\n",
            "comment write_ply generated\n",
            f"element vertex {n_p}\n",
            "property float x\n",
            "property float y\n",
            "property float z\n",
            "end_header"]
        fmt = '%.6f','%.6f','%.6f'

    elif n_cols == 6:
        header = ["ply\nformat ascii 1.0\n",
            "comment write_ply generated\n",
            f"element vertex {n_p}\n",
            "property float x\n",
            "property float y\n",
            "property float z\n",
            "property uchar red\n",
            "property uchar green\n",
            "property uchar blue\n",
            "end_header"]
        fmt = '%.6f','%.6f','%.6f','%d','%d','%d'
    np.savetxt(file,data,
                delimiter=" ",
                header="".join(header),
                comments="",
                fmt=fmt)
    print(f"{time.asctime()} | {name}.ply have been saved with {n_p} points!")



def update_folder_for_today(folder_tree:dict[str,str]):
    """
    "sup_folder" + "today" +"sub_folder" >> "today_folder"
    """
    try:
        sup = folder_tree["sup_folder"]
        sub = folder_tree["sub_folder"]

        today = datetime.now().strftime('%Y-%m-%d')
        today_folder = os.path.join(sup,today,sub)

        folder_tree["today"] = today
        folder_tree["today_folder"] = today_folder
    except Exception as e:
        raise ValueError(f"{e}")


if __name__ == "__main__":
    ply_array = read_ply('src\\microwave\\demo\\demoData\\2522.ply')
    
    print(type(ply_array))
    print(ply_array)