import cv2
import re
import os
import glob
import time

from sys import byteorder
import binascii
import numpy as np

SYNTHS_PER_PROJECT = 15

def to_float_bytes(f):
    if byteorder == 'little':
        return np.array([ float(f) ], dtype='<f4').tobytes()
    else:
        return np.array([ float(f) ], dtype='>f4').tobytes()

def path2framenum(path):
    return int( os.path.splitext(os.path.basename( path ))[0] )

def search_key_dir(key_dir):
    frames = glob.glob( os.path.join(key_dir ,"[0-9]*.png"), recursive=False)
    
    frames = sorted(frames)
    
    basename = os.path.splitext(os.path.basename( frames[0] ))[0]
    
    key_list = [ path2framenum(key) for key in frames ]
    
    print("digits = " + str(len(basename)))
    print("keys = " + str(key_list))
    
    return len(basename), key_list


def search_video_dir(video_dir):
    frames = glob.glob( os.path.join(video_dir, "[0-9]*.png"), recursive=False)
    
    frames = sorted(frames)
    
    first = path2framenum( frames[0] )
    last = path2framenum( frames[-1] )
    
    return first, last

def export_project( project, proj_filename ):
    
    proj_path = os.path.join( project["proj_dir"] , proj_filename + ".ebs")
    
    with open(proj_path, 'wb') as f:
        # header
        f.write( binascii.unhexlify('45') )
        f.write( binascii.unhexlify('42') )
        f.write( binascii.unhexlify('53') )
        f.write( binascii.unhexlify('30') )
        f.write( binascii.unhexlify('35') )
        f.write( binascii.unhexlify('00') )
        
        # video
        f.write( len( project["video_dir"] + project["file_name"]).to_bytes(4, byteorder) )
        f.write( (project["video_dir"] + project["file_name"]).encode() )
        
        # mask
        if project["mask_dir"]:
            f.write( len( project["mask_dir"] + project["file_name"]).to_bytes(4, byteorder) )
            f.write( (project["mask_dir"] + project["file_name"]).encode() )
        else:
            f.write( int(0).to_bytes(4, byteorder) )
            
        # key
        f.write( len( project["key_dir"] + project["file_name"]).to_bytes(4, byteorder) )
        f.write( (project["key_dir"] + project["file_name"]).encode() )
        
        # mask on flag
        if project["mask_dir"]:
            f.write( int(1).to_bytes(1, byteorder) )
        else:
            f.write( int(0).to_bytes(1, byteorder) )
        
        
        # keyframe weight
        f.write( to_float_bytes( project["key_weight"] ) )
        
        # video weight
        f.write( to_float_bytes( project["video_weight"] ) )
        
        # mask weight
        f.write( to_float_bytes( project["mask_weight"] ) )
        
        # mapping
        f.write( to_float_bytes( project["adv_mapping"] ) )
        
        # de-flicker
        f.write( to_float_bytes( project["adv_de-flicker"] ) )
        
        # diversity
        f.write( to_float_bytes( project["adv_diversity"] ) )
        
        
        # num of synths
        f.write( len( project["synth_list"] ).to_bytes(4, byteorder) )
        
        # synth
        for synth in project["synth_list"]:
            # key frame
            f.write( int( synth["key"] ).to_bytes(4, byteorder) )
            # is start frame exist
            f.write( int(1).to_bytes(1, byteorder) )
            # is end frame exist
            f.write( int(1).to_bytes(1, byteorder) )
            # start frame
            f.write( int( synth["prev_key"] ).to_bytes(4, byteorder) )
            # end frame
            f.write( int( synth["next_key"] ).to_bytes(4, byteorder) )
            
            # out path
            path =  "out-" + str(synth["key"]).zfill( project["number_of_digits"] ) + project["file_name"]
            f.write( len(path).to_bytes(4, byteorder) )
            f.write( path.encode() )
            
        # ?
        f.write( binascii.unhexlify('56') )
        f.write( binascii.unhexlify('30') )
        f.write( binascii.unhexlify('32') )
        f.write( binascii.unhexlify('00') )
        
        # synthesis detail
        f.write( int( project["adv_detail"] ).to_bytes(1, byteorder) )
        
        # padding
        f.write( binascii.unhexlify('00') )
        f.write( binascii.unhexlify('00') )
        f.write( binascii.unhexlify('00') )
        
        # use gpu
        f.write( int( project["adv_gpu"] ).to_bytes(1, byteorder) )
        
        # ?
        f.write( binascii.unhexlify('00') )
        f.write( binascii.unhexlify('00') )
        f.write( binascii.unhexlify('F0') )
        f.write( binascii.unhexlify('41') )
        f.write( binascii.unhexlify('C0') )
        f.write( binascii.unhexlify('02') )
        f.write( binascii.unhexlify('00') )
        f.write( binascii.unhexlify('00') )


def rename_keys(key_dir):
    imgs = glob.glob(os.path.join(key_dir, "*.png"), recursive=False)
    
    if not imgs:
        print('no files in %s' % key_dir)
        return
    
    p = re.compile(r'([0-9]+).*\.png')
    
    for img in imgs:
        
        filename = os.path.basename(img)
        
        m = p.fullmatch(filename)
        
        if m:
            f = m.group(1) + ".png"
            dirname = os.path.dirname(img)
            os.rename(img, os.path.join(dirname, f))

def ebsynth_utility_stage5(dbg, project_args, is_invert_mask):
    dbg.print("stage5")
    dbg.print("")
    
    project_dir, _, frame_path, frame_mask_path, _, img2img_key_path, img2img_upscale_key_path = project_args

    if not os.path.isdir(project_dir):
        dbg.print('project_dir : no such dir %s' % project_dir)
        return
    if not os.path.isdir(frame_path):
        dbg.print('frame_path : no such dir %s' % frame_path)
        return

    no_upscale = False

    if not os.path.isdir(img2img_upscale_key_path):
        dbg.print('img2img_upscale_key_path : no such dir %s' % img2img_upscale_key_path)
        if not os.path.isdir(img2img_key_path):
            return
        
        sample_img2img_key = glob.glob( os.path.join(img2img_key_path , "*.png" ) )[0]
        img_height1, img_width1, _ = cv2.imread(sample_img2img_key).shape
        sample_frame = glob.glob( os.path.join(frame_path , "*.png" ) )[0]
        img_height2, img_width2, _ = cv2.imread(sample_frame).shape

        if img_height1 != img_height2 or img_width1 != img_width2:
            return
        
        dbg.print('The size of frame and img2img_key matched. use %s instead' % img2img_key_path)
        img2img_upscale_key_path = img2img_key_path
        no_upscale = True

    else:
        rename_keys(img2img_upscale_key_path)
    
    number_of_digits, keys = search_key_dir( img2img_upscale_key_path )
    
    if number_of_digits == -1:
        dbg.print('no key frame')
        return
    
    first_frame, last_frame = search_video_dir( frame_path )
    
    ### add next key
    synth_list = []
    next_key = last_frame
    
    for key in keys[::-1]:
        synth_list.append( { "next_key": next_key })
        next_key = key
        
    synth_list = synth_list[::-1]
    prev_key = first_frame
    
    ### add key / prev key
    for i, key in enumerate(keys):
        synth_list[i]["key"] = key
        synth_list[i]["prev_key"] = prev_key
        prev_key = key
    
    project = {
        "proj_dir" : project_dir if is_invert_mask == False else os.path.join(project_dir, "inv"),
        "file_name" : "/[" + "#" *  number_of_digits + "].png",
        "number_of_digits" : number_of_digits,
        
        "key_dir" : "img2img_upscale_key" if no_upscale == False else "img2img_key",
        "video_dir" : "video_frame" if is_invert_mask == False else "../video_frame",
        "mask_dir" : "video_mask" if is_invert_mask == False else "inv_video_mask",
        "key_weight" : 1.0,
        "video_weight" : 4.0,
        "mask_weight" : 1.0,
        "adv_mapping" : 10.0,
        "adv_de-flicker" : 1.0,
        "adv_diversity" : 3500.0,
        "adv_detail" : 1,   # high
        "adv_gpu" : 1,      # use gpu
    }

    if not frame_mask_path:
        # no mask
        project["mask_dir"] = ""

    proj_base_name = time.strftime("%Y%m%d-%H%M%S")
    if is_invert_mask:
        proj_base_name = "inv_" + proj_base_name

    tmp=[]
    proj_index = 0
    for i, synth in enumerate(synth_list):
        tmp.append(synth)
        if (i % SYNTHS_PER_PROJECT == SYNTHS_PER_PROJECT-1):
            project["synth_list"] = tmp
            proj_file_name = proj_base_name + "_" + str(proj_index).zfill(5)
            export_project( project, proj_file_name )
            proj_index += 1
            tmp = []
            dbg.print("exported : " + proj_file_name + ".ebs" )
    
    if tmp:
        project["synth_list"] = tmp
        proj_file_name = proj_base_name + "_" + str(proj_index).zfill(5)
        export_project( project, proj_file_name )
        proj_index += 1
        dbg.print("exported : " + proj_file_name + ".ebs" )
    
    dbg.print("")
    dbg.print("completed.")