import os
from random import random
os.environ["TOKENIZERS_PARALLELISM"] = "false"
import os.path as osp
from typing import List
import math
import time
import hashlib
import yaml
import argparse
import shutil
import re

import cv2
import numpy as np
import torch
torch._dynamo.config.cache_size_limit=64
from transformers import AutoTokenizer, T5EncoderModel, T5TokenizerFast
from PIL import Image, ImageEnhance
import torch.nn.functional as F
from torch.cuda.amp import autocast

from infinity.models.infinity import Infinity
from infinity.models.basic import *
import PIL.Image as PImage
from torchvision.transforms.functional import to_tensor
from infinity.utils.dynamic_resolution import dynamic_resolution_h_w, h_div_w_templates
from tqdm import tqdm

def extract_key_val(text):
    pattern = r'<(.+?):(.+?)>'
    matches = re.findall(pattern, text)
    key_val = {}
    for match in matches:
        key_val[match[0]] = match[1].lstrip()
    return key_val

def encode_prompt(text_tokenizer, text_encoder, prompt, enable_positive_prompt=False):
    if enable_positive_prompt:
        print(f'before positive_prompt aug: {prompt}')
        prompt = aug_with_positive_prompt(prompt)
        print(f'after positive_prompt aug: {prompt}')
    #print(f'prompt={prompt}')
    captions = [prompt]
    tokens = text_tokenizer(text=captions, max_length=512, padding='max_length', truncation=True, return_tensors='pt')  # todo: put this into dataset
    input_ids = tokens.input_ids.cuda(non_blocking=True)
    mask = tokens.attention_mask.cuda(non_blocking=True)
    text_features = text_encoder(input_ids=input_ids, attention_mask=mask)['last_hidden_state'].float()
    lens: List[int] = mask.sum(dim=-1).tolist()
    cu_seqlens_k = F.pad(mask.sum(dim=-1).to(dtype=torch.int32).cumsum_(0), (1, 0))
    Ltext = max(lens)    
    kv_compact = []
    for len_i, feat_i in zip(lens, text_features.unbind(0)):
        kv_compact.append(feat_i[:len_i])
    kv_compact = torch.cat(kv_compact, dim=0)
    text_cond_tuple = (kv_compact, lens, cu_seqlens_k, Ltext)
    return text_cond_tuple

def aug_with_positive_prompt(prompt):
    for key in ['man', 'woman', 'men', 'women', 'boy', 'girl', 'child', 'person', 'human', 'adult', 'teenager', 'employee', 
                'employer', 'worker', 'mother', 'father', 'sister', 'brother', 'grandmother', 'grandfather', 'son', 'daughter']:
        if key in prompt:
            prompt = prompt + '. very smooth faces, good looking faces, face to the camera, perfect facial features'
            break
    return prompt

def enhance_image(image):
    for t in range(1):
        contrast_image = image.copy()
        contrast_enhancer = ImageEnhance.Contrast(contrast_image)
        contrast_image = contrast_enhancer.enhance(1.05)  # 增强对比度
        color_image = contrast_image.copy()
        color_enhancer = ImageEnhance.Color(color_image)
        color_image = color_enhancer.enhance(1.05)  # 增强饱和度
    return color_image

def gen_one_img(
    infinity_test, 
    vae, 
    text_tokenizer,
    text_encoder,
    prompt, 
    cfg_list=[],
    tau_list=[],
    negative_prompt='',
    scale_schedule=None,
    top_k=900,
    top_p=0.97,
    cfg_sc=3,
    cfg_exp_k=0.0,
    cfg_insertion_layer=-5,
    vae_type=0,
    gumbel=0,
    softmax_merge_topk=-1,
    gt_leak=-1,
    gt_ls_Bl=None,
    g_seed=None,
    sampling_per_bits=1,
    enable_positive_prompt=0,
):
    sstt = time.time()
    if not isinstance(cfg_list, list):
        cfg_list = [cfg_list] * len(scale_schedule)
    if not isinstance(tau_list, list):
        tau_list = [tau_list] * len(scale_schedule)
    text_cond_tuple = encode_prompt(text_tokenizer, text_encoder, prompt, enable_positive_prompt)
    if negative_prompt:
        negative_label_B_or_BLT = encode_prompt(text_tokenizer, text_encoder, negative_prompt)
    else:
        negative_label_B_or_BLT = None
    #print(f'cfg: {cfg_list}, tau: {tau_list}')
    with torch.cuda.amp.autocast(enabled=True, dtype=torch.bfloat16, cache_enabled=True):
        stt = time.time()
        _, idx_bl_list, img_list, summed_codes = infinity_test.autoregressive_infer_cfg(
            vae=vae,
            scale_schedule=scale_schedule,
            label_B_or_BLT=text_cond_tuple, g_seed=g_seed,
            B=1, negative_label_B_or_BLT=negative_label_B_or_BLT, force_gt_Bhw=None,
            cfg_sc=cfg_sc, cfg_list=cfg_list, tau_list=tau_list, top_k=0, top_p=top_p,
            returns_vemb=1, ratio_Bl1=None, gumbel=gumbel, norm_cfg=False,
            cfg_exp_k=cfg_exp_k, cfg_insertion_layer=cfg_insertion_layer,
            vae_type=vae_type, softmax_merge_topk=softmax_merge_topk,
            ret_img=True, trunk_scale=1000,
            gt_leak=gt_leak, gt_ls_Bl=gt_ls_Bl, inference_mode=True,
            sampling_per_bits=sampling_per_bits,
        )
    #print(f"cost: {time.time() - sstt}, infinity cost={time.time() - stt}")
    img = img_list[0]
    return img, idx_bl_list, summed_codes

def get_prompt_id(prompt):
    md5 = hashlib.md5()
    md5.update(prompt.encode('utf-8'))
    prompt_id = md5.hexdigest()
    return prompt_id

def save_slim_model(infinity_model_path, save_file=None, device='cpu', key='gpt_fsdp'):
    print('[Save slim model]')
    full_ckpt = torch.load(infinity_model_path, map_location=device)
    infinity_slim = full_ckpt['trainer'][key]
    # ema_state_dict = cpu_d['trainer'].get('gpt_ema_fsdp', state_dict)
    if not save_file:
        save_file = osp.splitext(infinity_model_path)[0] + '-slim.pth'
    print(f'Save to {save_file}')
    torch.save(infinity_slim, save_file)
    print('[Save slim model] done')
    return save_file

def load_tokenizer(t5_path =''):
    print(f'[Loading tokenizer and text encoder]')
    text_tokenizer: T5TokenizerFast = AutoTokenizer.from_pretrained(t5_path, revision=None, legacy=True)
    text_tokenizer.model_max_length = 512
    text_encoder: T5EncoderModel = T5EncoderModel.from_pretrained(t5_path, torch_dtype=torch.float16)
    text_encoder.to('cuda')
    text_encoder.eval()
    text_encoder.requires_grad_(False)
    return text_tokenizer, text_encoder

def load_infinity(
    rope2d_each_sa_layer, 
    rope2d_normalized_by_hw, 
    use_scale_schedule_embedding, 
    pn, 
    use_bit_label, 
    add_lvl_embeding_only_first_block, 
    model_path='', 
    scale_schedule=None, 
    vae=None, 
    device='cuda', 
    model_kwargs=None,
    text_channels=2048,
    apply_spatial_patchify=0,
    use_flex_attn=False,
    bf16=False,
    checkpoint_type='torch',
):
    print(f'[Loading Infinity]')
    text_maxlen = 512
    with torch.cuda.amp.autocast(enabled=True, dtype=torch.bfloat16, cache_enabled=True), torch.no_grad():
        infinity_test: Infinity = Infinity(
            vae_local=vae, text_channels=text_channels, text_maxlen=text_maxlen,
            shared_aln=True, raw_scale_schedule=scale_schedule,
            checkpointing='full-block',
            customized_flash_attn=False,
            fused_norm=True,
            pad_to_multiplier=128,
            use_flex_attn=use_flex_attn,
            add_lvl_embeding_only_first_block=add_lvl_embeding_only_first_block,
            use_bit_label=use_bit_label,
            rope2d_each_sa_layer=rope2d_each_sa_layer,
            rope2d_normalized_by_hw=rope2d_normalized_by_hw,
            pn=pn,
            apply_spatial_patchify=apply_spatial_patchify,
            inference_mode=True,
            train_h_div_w_list=[1.0],
            **model_kwargs,
        ).to(device=device)
        print(f'[you selected Infinity with {model_kwargs=}] model size: {sum(p.numel() for p in infinity_test.parameters())/1e9:.2f}B, bf16={bf16}')

        if bf16:
            for block in infinity_test.unregistered_blocks:
                block.bfloat16()

        infinity_test.eval()
        infinity_test.requires_grad_(False)

        infinity_test.cuda()
        torch.cuda.empty_cache()

        print(f'[Load Infinity weights]')
        if checkpoint_type == 'torch':
            state_dict = torch.load(model_path, map_location=device)
            print(infinity_test.load_state_dict(state_dict))
        elif checkpoint_type == 'torch_shard':
            from transformers.modeling_utils import load_sharded_checkpoint
            load_sharded_checkpoint(infinity_test, model_path, strict=False)
        infinity_test.rng = torch.Generator(device=device)
        return infinity_test

def transform(pil_img, tgt_h, tgt_w):
    width, height = pil_img.size
    if width / height <= tgt_w / tgt_h:
        resized_width = tgt_w
        resized_height = int(tgt_w / (width / height))
    else:
        resized_height = tgt_h
        resized_width = int((width / height) * tgt_h)
    pil_img = pil_img.resize((resized_width, resized_height), resample=PImage.LANCZOS)
    # crop the center out
    arr = np.array(pil_img)
    crop_y = (arr.shape[0] - tgt_h) // 2
    crop_x = (arr.shape[1] - tgt_w) // 2
    im = to_tensor(arr[crop_y: crop_y + tgt_h, crop_x: crop_x + tgt_w])
    return im.add(im).add_(-1)

def joint_vi_vae_encode_decode(vae, image_path, scale_schedule, device, tgt_h, tgt_w):
    pil_image = Image.open(image_path).convert('RGB')
    inp = transform(pil_image, tgt_h, tgt_w)
    inp = inp.unsqueeze(0).to(device)
    scale_schedule = [(item[0], item[1], item[2]) for item in scale_schedule]
    t1 = time.time()
    h, z, _, all_bit_indices, _, infinity_input = vae.encode(inp, scale_schedule=scale_schedule)
    t2 = time.time()
    recons_img = vae.decode(z)[0]
    if len(recons_img.shape) == 4:
        recons_img = recons_img.squeeze(1)
    print(f'recons: z.shape: {z.shape}, recons_img shape: {recons_img.shape}')
    t3 = time.time()
    print(f'vae encode takes {t2-t1:.2f}s, decode takes {t3-t2:.2f}s')
    recons_img = (recons_img + 1) / 2
    recons_img = recons_img.permute(1, 2, 0).mul_(255).cpu().numpy().astype(np.uint8)
    gt_img = (inp[0] + 1) / 2
    gt_img = gt_img.permute(1, 2, 0).mul_(255).cpu().numpy().astype(np.uint8)
    print(recons_img.shape, gt_img.shape)
    return gt_img, recons_img, all_bit_indices

def load_visual_tokenizer(args):
    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    # load vae
    if args.vae_type in [14,16,18,20,24,32,64]:
        from infinity.models.bsq_vae.vae import vae_model
        schedule_mode = "dynamic"
        codebook_dim = args.vae_type
        codebook_size = 2**codebook_dim
        if args.apply_spatial_patchify:
            patch_size = 8
            encoder_ch_mult=[1, 2, 4, 4]
            decoder_ch_mult=[1, 2, 4, 4]
        else:
            patch_size = 16
            encoder_ch_mult=[1, 2, 4, 4, 4]
            decoder_ch_mult=[1, 2, 4, 4, 4]
        vae = vae_model(args.vae_path, schedule_mode, codebook_dim, codebook_size, patch_size=patch_size, 
                        encoder_ch_mult=encoder_ch_mult, decoder_ch_mult=decoder_ch_mult, test_mode=True).to(device)
    else:
        raise ValueError(f'vae_type={args.vae_type} not supported')
    return vae

def load_transformer(vae, args):
    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    model_path = args.model_path
    if args.checkpoint_type == 'torch': 
        # copy large model to local; save slim to local; and copy slim to nas; load local slim model
        if osp.exists(args.cache_dir):
            local_model_path = osp.join(args.cache_dir, 'tmp', model_path.replace('/', '_'))
        else:
            local_model_path = model_path
        if args.enable_model_cache:
            slim_model_path = model_path.replace('ar-', 'slim-')
            local_slim_model_path = local_model_path.replace('ar-', 'slim-')
            os.makedirs(osp.dirname(local_slim_model_path), exist_ok=True)
            print(f'model_path: {model_path}, slim_model_path: {slim_model_path}')
            print(f'local_model_path: {local_model_path}, local_slim_model_path: {local_slim_model_path}')
            if not osp.exists(local_slim_model_path):
                if osp.exists(slim_model_path):
                    print(f'copy {slim_model_path} to {local_slim_model_path}')
                    shutil.copyfile(slim_model_path, local_slim_model_path)
                else:
                    if not osp.exists(local_model_path):
                        print(f'copy {model_path} to {local_model_path}')
                        shutil.copyfile(model_path, local_model_path)
                    save_slim_model(local_model_path, save_file=local_slim_model_path, device=device)
                    print(f'copy {local_slim_model_path} to {slim_model_path}')
                    if not osp.exists(slim_model_path):
                        shutil.copyfile(local_slim_model_path, slim_model_path)
                        os.remove(local_model_path)
                        os.remove(model_path)
            slim_model_path = local_slim_model_path
        else:
            slim_model_path = model_path
        print(f'load checkpoint from {slim_model_path}')
    elif args.checkpoint_type == 'torch_shard':
        slim_model_path = model_path

    if args.model_type == 'infinity_2b':
        kwargs_model = dict(depth=32, embed_dim=2048, num_heads=2048//128, drop_path_rate=0.1, mlp_ratio=4, block_chunks=8) # 2b model
    elif args.model_type == 'infinity_8b':
        kwargs_model = dict(depth=40, embed_dim=3584, num_heads=28, drop_path_rate=0.1, mlp_ratio=4, block_chunks=8)
    elif args.model_type == 'infinity_layer12':
        kwargs_model = dict(depth=12, embed_dim=768, num_heads=8, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    elif args.model_type == 'infinity_layer16':
        kwargs_model = dict(depth=16, embed_dim=1152, num_heads=12, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    elif args.model_type == 'infinity_layer24':
        kwargs_model = dict(depth=24, embed_dim=1536, num_heads=16, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    elif args.model_type == 'infinity_layer32':
        kwargs_model = dict(depth=32, embed_dim=2080, num_heads=20, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    elif args.model_type == 'infinity_layer40':
        kwargs_model = dict(depth=40, embed_dim=2688, num_heads=24, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    elif args.model_type == 'infinity_layer48':
        kwargs_model = dict(depth=48, embed_dim=3360, num_heads=28, drop_path_rate=0.1, mlp_ratio=4, block_chunks=4)
    infinity = load_infinity(
        rope2d_each_sa_layer=args.rope2d_each_sa_layer, 
        rope2d_normalized_by_hw=args.rope2d_normalized_by_hw,
        use_scale_schedule_embedding=args.use_scale_schedule_embedding,
        pn=args.pn,
        use_bit_label=args.use_bit_label, 
        add_lvl_embeding_only_first_block=args.add_lvl_embeding_only_first_block, 
        model_path=slim_model_path, 
        scale_schedule=None, 
        vae=vae, 
        device=device, 
        model_kwargs=kwargs_model,
        text_channels=args.text_channels,
        apply_spatial_patchify=args.apply_spatial_patchify,
        use_flex_attn=args.use_flex_attn,
        bf16=args.bf16,
        checkpoint_type=args.checkpoint_type,
    )
    return infinity

def add_common_arguments(parser):
    parser.add_argument('--cfg', type=str, default='3')
    parser.add_argument('--tau', type=float, default=1)
    parser.add_argument('--pn', type=str, required=True, choices=['0.06M', '0.25M', '1M'])
    parser.add_argument('--model_path', type=str, required=True)
    parser.add_argument('--cfg_insertion_layer', type=int, default=0)
    parser.add_argument('--vae_type', type=int, default=1)
    parser.add_argument('--vae_path', type=str, default='')
    parser.add_argument('--add_lvl_embeding_only_first_block', type=int, default=0, choices=[0,1])
    parser.add_argument('--use_bit_label', type=int, default=1, choices=[0,1])
    parser.add_argument('--model_type', type=str, default='infinity_2b')
    parser.add_argument('--rope2d_each_sa_layer', type=int, default=1, choices=[0,1])
    parser.add_argument('--rope2d_normalized_by_hw', type=int, default=2, choices=[0,1,2])
    parser.add_argument('--use_scale_schedule_embedding', type=int, default=0, choices=[0,1])
    parser.add_argument('--sampling_per_bits', type=int, default=1, choices=[1,2,4,8,16])
    parser.add_argument('--text_encoder_ckpt', type=str, default='')
    parser.add_argument('--text_channels', type=int, default=2048)
    parser.add_argument('--apply_spatial_patchify', type=int, default=0, choices=[0,1])
    parser.add_argument('--h_div_w_template', type=float, default=1.000)
    parser.add_argument('--use_flex_attn', type=int, default=0, choices=[0,1])
    parser.add_argument('--enable_positive_prompt', type=int, default=0, choices=[0,1])
    parser.add_argument('--cache_dir', type=str, default='/dev/shm')
    parser.add_argument('--enable_model_cache', type=int, default=0, choices=[0,1])
    parser.add_argument('--checkpoint_type', type=str, default='torch')
    parser.add_argument('--seed', type=int, default=0)
    parser.add_argument('--bf16', type=int, default=1, choices=[0,1])
    


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    add_common_arguments(parser)
    parser.add_argument('--prompt_txt_file', type=str, default='')
    parser.add_argument('--save_folder', type=str, default='./generated')
    args = parser.parse_args()

    seed = args.seed
    random.seed(seed)
    np.random.seed(seed)
    torch.manual_seed(seed)
    torch.cuda.manual_seed_all(seed)
    
    # parse cfg
    args.cfg = list(map(float, args.cfg.split(',')))
    if len(args.cfg) == 1:
        args.cfg = args.cfg[0]
    
    # load text encoder
    text_tokenizer, text_encoder = load_tokenizer(t5_path =args.text_encoder_ckpt)
    # load vae
    vae = load_visual_tokenizer(args)
    # load infinity
    infinity = load_transformer(vae, args)
    
    scale_schedule = dynamic_resolution_h_w[args.h_div_w_template][args.pn]['scales']
    scale_schedule = [ (1, h, w) for (_, h, w) in scale_schedule]
    with open(args.prompt_txt_file, 'r') as f:
        lines = f.readlines()
        for line in tqdm(lines):
            prompt = line.strip()
            save_file = f'{args.save_folder}/{get_prompt_id(prompt)}.png'
            with autocast(dtype=torch.bfloat16):
                with torch.no_grad():
                    generated_image, idx_bld_list, summed_codes = gen_one_img(
                        infinity,
                        vae,
                        text_tokenizer,
                        text_encoder,
                        prompt,
                        g_seed=args.seed,
                        gt_leak=0,
                        gt_ls_Bl=None,
                        cfg_list=args.cfg,
                        tau_list=args.tau,
                        scale_schedule=scale_schedule,
                        cfg_insertion_layer=[args.cfg_insertion_layer],
                        vae_type=args.vae_type,
                        sampling_per_bits=args.sampling_per_bits,
                        enable_positive_prompt=args.enable_positive_prompt,
                    )
            os.makedirs(osp.dirname(osp.abspath(save_file)), exist_ok=True)
            cv2.imwrite(save_file, generated_image.cpu().numpy())
            torch.save(summed_codes.detach().cpu(), osp.splitext(save_file)[0] + '_summed_codes.pt')
            torch.save(idx_bld_list, osp.splitext(save_file)[0] + '_idx_bld.pt')
    #print(f'Save to {osp.abspath(save_file)}')
