import random
import gradio as gr
import numpy as np
import spaces
import torch
from diffusers import AutoPipelineForText2Image, AutoencoderKL, EulerDiscreteScheduler
from compel import Compel, ReturnedEmbeddingsType

import re

# =====================================
# Prompt weights
# =====================================
import torch
import re
def parse_prompt_attention(text):
    re_attention = re.compile(r"""
      \\\(|
      \\\)|
      \\\[|
      \\]|
      \\\\|
      \\|
      \(|
      \[|
      :([+-]?[.\d]+)\)|
      \)|
      ]|
      [^\\()\[\]:]+|
      :
      """, re.X)

    res = []
    round_brackets = []
    square_brackets = []

    round_bracket_multiplier = 1.1
    square_bracket_multiplier = 1 / 1.1

    def multiply_range(start_position, multiplier):
        for p in range(start_position, len(res)):
            res[p][1] *= multiplier

    for m in re_attention.finditer(text):
        text = m.group(0)
        weight = m.group(1)

        if text.startswith('\\'):
            res.append([text[1:], 1.0])
        elif text == '(':
            round_brackets.append(len(res))
        elif text == '[':
            square_brackets.append(len(res))
        elif weight is not None and len(round_brackets) > 0:
            multiply_range(round_brackets.pop(), float(weight))
        elif text == ')' and len(round_brackets) > 0:
            multiply_range(round_brackets.pop(), round_bracket_multiplier)
        elif text == ']' and len(square_brackets) > 0:
            multiply_range(square_brackets.pop(), square_bracket_multiplier)
        else:
            parts = re.split(re.compile(r"\s*\bBREAK\b\s*", re.S), text)
            for i, part in enumerate(parts):
                if i > 0:
                    res.append(["BREAK", -1])
                res.append([part, 1.0])

    for pos in round_brackets:
        multiply_range(pos, round_bracket_multiplier)

    for pos in square_brackets:
        multiply_range(pos, square_bracket_multiplier)

    if len(res) == 0:
        res = [["", 1.0]]

    # merge runs of identical weights
    i = 0
    while i + 1 < len(res):
        if res[i][1] == res[i + 1][1]:
            res[i][0] += res[i + 1][0]
            res.pop(i + 1)
        else:
            i += 1

    return res

def prompt_attention_to_invoke_prompt(attention):
    tokens = []
    for text, weight in attention:
        # Round weight to 2 decimal places
        weight = round(weight, 2)
        if weight == 1.0:
            tokens.append(text)
        elif weight < 1.0:
            if weight < 0.8:
                tokens.append(f"({text}){weight}")
            else:
                tokens.append(f"({text})-" + "-" * int((1.0 - weight) * 10))
        else:
            if weight < 1.3:
                tokens.append(f"({text})" + "+" * int((weight - 1.0) * 10))
            else:
                tokens.append(f"({text}){weight}")
    return "".join(tokens)

def concat_tensor(t):
    t_list = torch.split(t, 1, dim=0)
    t = torch.cat(t_list, dim=1)
    return t

def merge_embeds(prompt_chanks, compel):
    num_chanks = len(prompt_chanks)
    if num_chanks != 0:
        power_prompt = 1/(num_chanks*(num_chanks+1)//2)
        prompt_embs = compel(prompt_chanks)
        t_list = list(torch.split(prompt_embs, 1, dim=0))
        for i in range(num_chanks):
            t_list[-(i+1)] = t_list[-(i+1)] * ((i+1)*power_prompt)
        prompt_emb = torch.stack(t_list, dim=0).sum(dim=0)
    else:
        prompt_emb = compel('')
    return prompt_emb

def detokenize(chunk, actual_prompt):
    chunk[-1] = chunk[-1].replace('</w>', '')
    chanked_prompt = ''.join(chunk).strip()
    while '</w>' in chanked_prompt:
        if actual_prompt[chanked_prompt.find('</w>')] == ' ':
            chanked_prompt = chanked_prompt.replace('</w>', ' ', 1)
        else:
            chanked_prompt = chanked_prompt.replace('</w>', '', 1)
    actual_prompt = actual_prompt.replace(chanked_prompt,'')
    return chanked_prompt.strip(), actual_prompt.strip()

def tokenize_line(line, tokenizer): # split into chunks
    actual_prompt = line.lower().strip()
    actual_tokens = tokenizer.tokenize(actual_prompt)
    max_tokens = tokenizer.model_max_length - 2
    comma_token = tokenizer.tokenize(',')[0]

    chunks = []
    chunk = []
    for item in actual_tokens:
        chunk.append(item)
        if len(chunk) == max_tokens:
            if chunk[-1] != comma_token:
                for i in range(max_tokens-1, -1, -1):
                    if chunk[i] == comma_token:
                        actual_chunk, actual_prompt = detokenize(chunk[:i+1], actual_prompt)
                        chunks.append(actual_chunk)
                        chunk = chunk[i+1:]
                        break
                else:
                    actual_chunk, actual_prompt = detokenize(chunk, actual_prompt)
                    chunks.append(actual_chunk)
                    chunk = []
            else:
                actual_chunk, actual_prompt = detokenize(chunk, actual_prompt)
                chunks.append(actual_chunk)
                chunk = []
    if chunk:
        actual_chunk, _ = detokenize(chunk, actual_prompt)
        chunks.append(actual_chunk)

    return chunks

def get_embed_new(prompt, pipeline, compel, only_convert_string=False, compel_process_sd=False):

    if compel_process_sd:
        return merge_embeds(tokenize_line(prompt, pipeline.tokenizer), compel)
    else:
        # fix bug weights conversion excessive emphasis
        prompt = prompt.replace("((", "(").replace("))", ")").replace("\\", "\\\\\\")

    # Convert to Compel
    attention = parse_prompt_attention(prompt)
    global_attention_chanks = []

    for att in attention:
        for chank in att[0].split(','):
            temp_prompt_chanks = tokenize_line(chank, pipeline.tokenizer)
            for small_chank in temp_prompt_chanks:
                temp_dict = {
                    "weight": round(att[1], 2),
                    "lenght": len(pipeline.tokenizer.tokenize(f'{small_chank},')),
                    "prompt": f'{small_chank},'
                }
                global_attention_chanks.append(temp_dict)

    max_tokens = pipeline.tokenizer.model_max_length - 2
    global_prompt_chanks = []
    current_list = []
    current_length = 0
    for item in global_attention_chanks:
        if current_length + item['lenght'] > max_tokens:
            global_prompt_chanks.append(current_list)
            current_list = [[item['prompt'], item['weight']]]
            current_length = item['lenght']
        else:
            if not current_list:
                current_list.append([item['prompt'], item['weight']])
            else:
                if item['weight'] != current_list[-1][1]:
                    current_list.append([item['prompt'], item['weight']])
                else:
                    current_list[-1][0] += f" {item['prompt']}"
            current_length += item['lenght']
    if current_list:
        global_prompt_chanks.append(current_list)

    if only_convert_string:
        return ' '.join([prompt_attention_to_invoke_prompt(i) for i in global_prompt_chanks])

    return merge_embeds([prompt_attention_to_invoke_prompt(i) for i in global_prompt_chanks], compel)

def add_comma_after_pattern_ti(text):
    pattern = re.compile(r'\b\w+_\d+\b')
    modified_text = pattern.sub(lambda x: x.group() + ',', text)
    return modified_text
    
if not torch.cuda.is_available():
    DESCRIPTION += "\n<p>你现在运行在CPU上 但是此项目只支持GPU.</p>"

MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 4096

if torch.cuda.is_available():
    vae = AutoencoderKL.from_pretrained("madebyollin/sdxl-vae-fp16-fix", torch_dtype=torch.float16)
    pipe = AutoPipelineForText2Image.from_pretrained(
        "Menyu/noobai-xl-vpred-v0_6",
        vae=vae,
        torch_dtype=torch.float16,
        use_safetensors=True,
        add_watermarker=False
    )
    pipe.scheduler = EulerDiscreteScheduler.from_config(pipe.scheduler.config)
    pipe.scheduler.register_to_config(
        prediction_type="v_prediction",
        rescale_betas_zero_snr=True,
    )
    pipe.to("cuda")

def randomize_seed_fn(seed: int, randomize_seed: bool) -> int:
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    return seed

@spaces.GPU
def infer(
    prompt: str,
    negative_prompt: str = "lowres, {bad}, error, fewer, extra, missing, worst quality, jpeg artifacts, bad quality, watermark, unfinished, displeasing, chromatic aberration, signature, extra digits, artistic error, username, scan, [abstract]",
    use_negative_prompt: bool = True,
    seed: int = 7,
    width: int = 832,
    height: int = 1216,
    guidance_scale: float = 3,
    num_inference_steps: int = 30,
    randomize_seed: bool = True,
    use_resolution_binning: bool = True,
    progress=gr.Progress(track_tqdm=True),
):
    seed = int(randomize_seed_fn(seed, randomize_seed))
    generator = torch.Generator().manual_seed(seed)
    # 初始化 Compel 实例
    compel = Compel(
        tokenizer=[pipe.tokenizer, pipe.tokenizer_2],
        text_encoder=[pipe.text_encoder, pipe.text_encoder_2],
        returned_embeddings_type=ReturnedEmbeddingsType.PENULTIMATE_HIDDEN_STATES_NON_NORMALIZED,
        requires_pooled=[False, True],
        truncate_long_prompts=False
    )
    # 在 infer 函数中调用 get_embed_new
    if not use_negative_prompt:
        negative_prompt = ""
    prompt = get_embed_new(prompt, pipe, compel, only_convert_string=True)
    negative_prompt = get_embed_new(negative_prompt, pipe, compel, only_convert_string=True)
    conditioning, pooled = compel([prompt, negative_prompt]) # 必须同时处理来保证长度相等
    
    # 在调用 pipe 时，使用新的参数名称（确保参数名称正确）
    image = pipe(
        prompt_embeds=conditioning[0:1],
        pooled_prompt_embeds=pooled[0:1],
        negative_prompt_embeds=conditioning[1:2],
        negative_pooled_prompt_embeds=pooled[1:2],
        width=width,
        height=height,
        guidance_scale=guidance_scale,
        num_inference_steps=num_inference_steps,
        generator=generator,
        use_resolution_binning=use_resolution_binning,
    ).images[0]
    return image, seed

examples = [
    "nahida (genshin impact)",
    "klee (genshin impact)",
]

css = '''
.gradio-container{max-width: 560px !important}
h1{text-align:center}
footer {
    visibility: hidden
}
'''

with gr.Blocks(css=css) as demo:
    gr.Markdown("""# 梦羽的模型生成器
        ### 快速生成NoobAIXL V预测0.6版本的模型图片""")
    with gr.Group():
        with gr.Row():
            prompt = gr.Text(
                label="关键词",
                show_label=False,
                max_lines=5,
                placeholder="输入你要的图片关键词",
                container=False,
            )
            run_button = gr.Button("生成", scale=0, variant="primary")
        result = gr.Image(label="Result", show_label=False, format="png")
    with gr.Accordion("高级选项", open=False):
        with gr.Row():
            use_negative_prompt = gr.Checkbox(label="使用反向词条", value=True)
            negative_prompt = gr.Text(
                label="反向词条",
                max_lines=5,
                lines=4,
                placeholder="输入你要排除的图片关键词",
                value="lowres, {bad}, error, fewer, extra, missing, worst quality, jpeg artifacts, bad quality, watermark, unfinished, displeasing, chromatic aberration, signature, extra digits, artistic error, username, scan, [abstract]",
                visible=True,
            )
        seed = gr.Slider(
            label="种子",
            minimum=0,
            maximum=MAX_SEED,
            step=1,
            value=0,
        )
        randomize_seed = gr.Checkbox(label="随机种子", value=True)
        with gr.Row(visible=True):
            width = gr.Slider(
                label="宽度",
                minimum=512,
                maximum=MAX_IMAGE_SIZE,
                step=64,
                value=832,
            )
            height = gr.Slider(
                label="高度",
                minimum=512,
                maximum=MAX_IMAGE_SIZE,
                step=64,
                value=1216,
            )
        with gr.Row():
            guidance_scale = gr.Slider(
                label="Guidance Scale",
                minimum=0.1,
                maximum=10,
                step=0.1,
                value=5.0,
            )
            num_inference_steps = gr.Slider(
                label="生成步数",
                minimum=1,
                maximum=50,
                step=1,
                value=28,
            )

    gr.Examples(
        examples=examples,
        inputs=prompt,
        outputs=[result, seed],
        fn=infer
    )

    use_negative_prompt.change(
        fn=lambda x: gr.update(visible=x),
        inputs=use_negative_prompt,
        outputs=negative_prompt,
    )

    gr.on(
        triggers=[prompt.submit, run_button.click],
        fn=infer,
        inputs=[
            prompt,
            negative_prompt,
            use_negative_prompt,
            seed,
            width,
            height,
            guidance_scale,
            num_inference_steps,
            randomize_seed,
        ],
        outputs=[result, seed],
    )

if __name__ == "__main__":
    demo.launch()