#!/usr/bin/env python

import os
import re
import tempfile
from collections.abc import Iterator
from threading import Thread

import requests  # <-- For SERPHouse web search
import cv2
import gradio as gr
import spaces
import torch
from loguru import logger
from PIL import Image
from transformers import AutoProcessor, Gemma3ForConditionalGeneration, TextIteratorStreamer

# CSV/TXT 분석
import pandas as pd

# PDF 텍스트 추출
import PyPDF2

##############################################################################
# SERPHouse API key for web search
##############################################################################
SERPHOUSE_API_KEY = "V38CNn4HXpLtynJQyOeoUensTEYoFy8PBUxKpDqAW1pawT1vfJ2BWtPQ98h6"

##############################################################################
# [새로 추가] 사용자 메시지로부터 간단히 키워드 추출하는 함수 예시
# - 실제 환경에 맞게 stopwords, 형태소 분석 등 고도화 가능
##############################################################################
def extract_keywords(text: str, top_k: int = 5) -> str:
    # 1) 소문자로
    text = text.lower()
    # 2) 알파벳/숫자/공백 제외 문자 제거
    text = re.sub(r"[^a-z0-9\s]", "", text)
    # 3) 공백단위 토큰
    tokens = text.split()
    # 4) 우선은 앞에서 몇 개 토큰만 사용 (top_k=5)
    #    - 필요시 stopword 제거나 빈도수 계산 후 상위 k개 추출하도록 변경 가능
    key_tokens = tokens[:top_k]
    # 5) 공백으로 join
    return " ".join(key_tokens)

##############################################################################
# Simple function to call the SERPHouse Live endpoint
# https://api.serphouse.com/serp/live
##############################################################################
def do_web_search(query: str) -> str:
    """
    Calls SERPHouse live endpoint with the given query (q).
    Returns top-20 results' titles as a bullet list, or an error message.
    """
    try:
        url = "https://api.serphouse.com/serp/live"
        params = {
            "q": query,
            "domain": "google.com",
            "lang": "en",
            "device": "desktop",
            "serp_type": "web",
            "num_result": "20",  # [새로 추가] 상위 20개 결과
            "api_token": SERPHOUSE_API_KEY,
        }
        resp = requests.get(url, params=params, timeout=30)
        resp.raise_for_status()  # Raise an exception for 4xx/5xx errors
        data = resp.json()

        results = data.get("results", {})
        organic = results.get("results", {}).get("organic", [])
        if not organic:
            return "No web search results found."

        # 상위 20개 제목만 뽑아서 정리
        summary_lines = []
        for idx, item in enumerate(organic[:20], start=1):
            title = item.get("title", "No Title")
            summary_lines.append(f"{idx}. {title}")

        # 20개를 \n 으로 연결
        return "\n".join(summary_lines)
    except Exception as e:
        logger.error(f"Web search failed: {e}")
        return f"Web search failed: {str(e)}"


MAX_CONTENT_CHARS = 4000  # 너무 큰 파일을 막기 위해 최대 표시 4000자

model_id = os.getenv("MODEL_ID", "google/gemma-3-27b-it")
processor = AutoProcessor.from_pretrained(model_id, padding_side="left")
model = Gemma3ForConditionalGeneration.from_pretrained(
    model_id,
    device_map="auto",
    torch_dtype=torch.bfloat16,
    attn_implementation="eager"
)

MAX_NUM_IMAGES = int(os.getenv("MAX_NUM_IMAGES", "5"))


##################################################
# CSV, TXT, PDF 분석 함수
##################################################
def analyze_csv_file(path: str) -> str:
    try:
        df = pd.read_csv(path)
        if df.shape[0] > 50 or df.shape[1] > 10:
            df = df.iloc[:50, :10]
        df_str = df.to_string()
        if len(df_str) > MAX_CONTENT_CHARS:
            df_str = df_str[:MAX_CONTENT_CHARS] + "\n...(truncated)..."
        return f"**[CSV File: {os.path.basename(path)}]**\n\n{df_str}"
    except Exception as e:
        return f"Failed to read CSV ({os.path.basename(path)}): {str(e)}"


def analyze_txt_file(path: str) -> str:
    try:
        with open(path, "r", encoding="utf-8") as f:
            text = f.read()
        if len(text) > MAX_CONTENT_CHARS:
            text = text[:MAX_CONTENT_CHARS] + "\n...(truncated)..."
        return f"**[TXT File: {os.path.basename(path)}]**\n\n{text}"
    except Exception as e:
        return f"Failed to read TXT ({os.path.basename(path)}): {str(e)}"


def pdf_to_markdown(pdf_path: str) -> str:
    text_chunks = []
    try:
        with open(pdf_path, "rb") as f:
            reader = PyPDF2.PdfReader(f)
            max_pages = min(5, len(reader.pages))
            for page_num in range(max_pages):
                page = reader.pages[page_num]
                page_text = page.extract_text() or ""
                page_text = page_text.strip()
                if page_text:
                    if len(page_text) > MAX_CONTENT_CHARS // max_pages:
                        page_text = page_text[:MAX_CONTENT_CHARS // max_pages] + "...(truncated)"
                    text_chunks.append(f"## Page {page_num+1}\n\n{page_text}\n")
            if len(reader.pages) > max_pages:
                text_chunks.append(f"\n...(Showing {max_pages} of {len(reader.pages)} pages)...")
    except Exception as e:
        return f"Failed to read PDF ({os.path.basename(pdf_path)}): {str(e)}"

    full_text = "\n".join(text_chunks)
    if len(full_text) > MAX_CONTENT_CHARS:
        full_text = full_text[:MAX_CONTENT_CHARS] + "\n...(truncated)..."

    return f"**[PDF File: {os.path.basename(pdf_path)}]**\n\n{full_text}"


##################################################
# 이미지/비디오 업로드 제한 검사
##################################################
def count_files_in_new_message(paths: list[str]) -> tuple[int, int]:
    image_count = 0
    video_count = 0
    for path in paths:
        if path.endswith(".mp4"):
            video_count += 1
        elif re.search(r"\.(png|jpg|jpeg|gif|webp)$", path, re.IGNORECASE):
            image_count += 1
    return image_count, video_count


def count_files_in_history(history: list[dict]) -> tuple[int, int]:
    image_count = 0
    video_count = 0
    for item in history:
        if item["role"] != "user" or isinstance(item["content"], str):
            continue
        if isinstance(item["content"], list) and len(item["content"]) > 0:
            file_path = item["content"][0]
            if isinstance(file_path, str):
                if file_path.endswith(".mp4"):
                    video_count += 1
                elif re.search(r"\.(png|jpg|jpeg|gif|webp)$", file_path, re.IGNORECASE):
                    image_count += 1
    return image_count, video_count


def validate_media_constraints(message: dict, history: list[dict]) -> bool:
    media_files = []
    for f in message["files"]:
        if re.search(r"\.(png|jpg|jpeg|gif|webp)$", f, re.IGNORECASE) or f.endswith(".mp4"):
            media_files.append(f)

    new_image_count, new_video_count = count_files_in_new_message(media_files)
    history_image_count, history_video_count = count_files_in_history(history)
    image_count = history_image_count + new_image_count
    video_count = history_video_count + new_video_count

    if video_count > 1:
        gr.Warning("Only one video is supported.")
        return False
    if video_count == 1:
        if image_count > 0:
            gr.Warning("Mixing images and videos is not allowed.")
            return False
        if "<image>" in message["text"]:
            gr.Warning("Using <image> tags with video files is not supported.")
            return False
    if video_count == 0 and image_count > MAX_NUM_IMAGES:
        gr.Warning(f"You can upload up to {MAX_NUM_IMAGES} images.")
        return False
    
    if "<image>" in message["text"]:
        image_files = [f for f in message["files"] if re.search(r"\.(png|jpg|jpeg|gif|webp)$", f, re.IGNORECASE)]
        image_tag_count = message["text"].count("<image>")
        if image_tag_count != len(image_files):
            gr.Warning("The number of <image> tags in the text does not match the number of image files.")
            return False

    return True


##################################################
# 비디오 처리
##################################################
def downsample_video(video_path: str) -> list[tuple[Image.Image, float]]:
    vidcap = cv2.VideoCapture(video_path)
    fps = vidcap.get(cv2.CAP_PROP_FPS)
    total_frames = int(vidcap.get(cv2.CAP_PROP_FRAME_COUNT))
    frame_interval = max(int(fps), int(total_frames / 10))  
    frames = []

    for i in range(0, total_frames, frame_interval):
        vidcap.set(cv2.CAP_PROP_POS_FRAMES, i)
        success, image = vidcap.read()
        if success:
            image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
            pil_image = Image.fromarray(image)
            timestamp = round(i / fps, 2)
            frames.append((pil_image, timestamp))
            if len(frames) >= 5:
                break

    vidcap.release()
    return frames


def process_video(video_path: str) -> list[dict]:
    content = []
    frames = downsample_video(video_path)
    for frame in frames:
        pil_image, timestamp = frame
        with tempfile.NamedTemporaryFile(delete=False, suffix=".png") as temp_file:
            pil_image.save(temp_file.name)
            content.append({"type": "text", "text": f"Frame {timestamp}:"})
            content.append({"type": "image", "url": temp_file.name})
    logger.debug(f"{content=}")
    return content


##################################################
# interleaved <image> 처리
##################################################
def process_interleaved_images(message: dict) -> list[dict]:
    parts = re.split(r"(<image>)", message["text"])
    content = []
    image_index = 0
    
    image_files = [f for f in message["files"] if re.search(r"\.(png|jpg|jpeg|gif|webp)$", f, re.IGNORECASE)]
    
    for part in parts:
        if part == "<image>" and image_index < len(image_files):
            content.append({"type": "image", "url": image_files[image_index]})
            image_index += 1
        elif part.strip():
            content.append({"type": "text", "text": part.strip()})
        else:
            if isinstance(part, str) and part != "<image>":
                content.append({"type": "text", "text": part})
    return content


##################################################
# PDF + CSV + TXT + 이미지/비디오
##################################################
def is_image_file(file_path: str) -> bool:
    return bool(re.search(r"\.(png|jpg|jpeg|gif|webp)$", file_path, re.IGNORECASE))

def is_video_file(file_path: str) -> bool:
    return file_path.endswith(".mp4")

def is_document_file(file_path: str) -> bool:
    return (file_path.lower().endswith(".pdf") or 
            file_path.lower().endswith(".csv") or 
            file_path.lower().endswith(".txt"))

def process_new_user_message(message: dict) -> list[dict]:
    if not message["files"]:
        return [{"type": "text", "text": message["text"]}]

    video_files = [f for f in message["files"] if is_video_file(f)]
    image_files = [f for f in message["files"] if is_image_file(f)]
    csv_files = [f for f in message["files"] if f.lower().endswith(".csv")]
    txt_files = [f for f in message["files"] if f.lower().endswith(".txt")]
    pdf_files = [f for f in message["files"] if f.lower().endswith(".pdf")]

    content_list = [{"type": "text", "text": message["text"]}]

    for csv_path in csv_files:
        csv_analysis = analyze_csv_file(csv_path)
        content_list.append({"type": "text", "text": csv_analysis})

    for txt_path in txt_files:
        txt_analysis = analyze_txt_file(txt_path)
        content_list.append({"type": "text", "text": txt_analysis})

    for pdf_path in pdf_files:
        pdf_markdown = pdf_to_markdown(pdf_path)
        content_list.append({"type": "text", "text": pdf_markdown})

    if video_files:
        content_list += process_video(video_files[0])
        return content_list

    if "<image>" in message["text"] and image_files:
        interleaved_content = process_interleaved_images({"text": message["text"], "files": image_files})
        if content_list[0]["type"] == "text":
            content_list = content_list[1:]
        return interleaved_content + content_list
    else:
        for img_path in image_files:
            content_list.append({"type": "image", "url": img_path})

    return content_list


##################################################
# history -> LLM 메시지 변환
##################################################
def process_history(history: list[dict]) -> list[dict]:
    messages = []
    current_user_content: list[dict] = []
    for item in history:
        if item["role"] == "assistant":
            if current_user_content:
                messages.append({"role": "user", "content": current_user_content})
                current_user_content = []
            messages.append({"role": "assistant", "content": [{"type": "text", "text": item["content"]}]})
        else:
            content = item["content"]
            if isinstance(content, str):
                current_user_content.append({"type": "text", "text": content})
            elif isinstance(content, list) and len(content) > 0:
                file_path = content[0]
                if is_image_file(file_path):
                    current_user_content.append({"type": "image", "url": file_path})
                else:
                    current_user_content.append({"type": "text", "text": f"[File: {os.path.basename(file_path)}]"})

    if current_user_content:
        messages.append({"role": "user", "content": current_user_content})
        
    return messages


##################################################
# 메인 추론 함수
##################################################
@spaces.GPU(duration=120)
def run(
    message: dict,
    history: list[dict],
    system_prompt: str = "",
    max_new_tokens: int = 512,
    use_web_search: bool = False,
    web_search_query: str = "",
) -> Iterator[str]:

    if not validate_media_constraints(message, history):
        yield ""
        return

    try:
        # [새로 추가] web search 체크된 경우, 사용자가 입력한 "web_search_query" 대신
        #             사용자의 메시지에서 키워드를 추출하여 검색
        if use_web_search:
            user_text = message["text"]
            # 키워드 추출
            ws_query = extract_keywords(user_text, top_k=5)
            logger.info(f"[Auto WebSearch Keyword] {ws_query!r}")
            # 상위 20개 결과 가져오기
            ws_result = do_web_search(ws_query)
            # 검색된 20개 제목을 system 메시지에 추가
            system_search_content = f"[Search top-20 Titles Based on user prompt]\n{ws_result}\n"
            # system 메시지로 추가
            # (LLM이 이 정보를 참고하도록)
            if system_search_content.strip():
                history_system_msg = {
                    "role": "system",
                    "content": [{"type": "text", "text": system_search_content}]
                }
            else:
                history_system_msg = {
                    "role": "system",
                    "content": [{"type": "text", "text": "No web search results"}]
                }
        else:
            history_system_msg = None

        messages = []
        if system_prompt:
            messages.append({"role": "system", "content": [{"type": "text", "text": system_prompt}]})
        # 만약 web search가 있었다면, 그 결과를 추가 system 메시지로 삽입
        if history_system_msg:
            messages.append(history_system_msg)

        messages.extend(process_history(history))
        
        user_content = process_new_user_message(message)
        for item in user_content:
            if item["type"] == "text" and len(item["text"]) > MAX_CONTENT_CHARS:
                item["text"] = item["text"][:MAX_CONTENT_CHARS] + "\n...(truncated)..."
        
        messages.append({"role": "user", "content": user_content})

        inputs = processor.apply_chat_template(
            messages,
            add_generation_prompt=True,
            tokenize=True,
            return_dict=True,
            return_tensors="pt",
        ).to(device=model.device, dtype=torch.bfloat16)

        streamer = TextIteratorStreamer(processor, timeout=30.0, skip_prompt=True, skip_special_tokens=True)
        gen_kwargs = dict(
            inputs,
            streamer=streamer,
            max_new_tokens=max_new_tokens,
        )
        
        t = Thread(target=model.generate, kwargs=gen_kwargs)
        t.start()

        output = ""
        for new_text in streamer:
            output += new_text
            yield output
            
    except Exception as e:
        logger.error(f"Error in run: {str(e)}")
        yield f"죄송합니다. 오류가 발생했습니다: {str(e)}"



examples = [

    [
        {
            "text": "두 PDF 파일 내용을 비교하라.",
            "files": ["assets/additional-examples/pdf.pdf"],
            "files": [
                "assets/additional-examples/before.pdf",
                "assets/additional-examples/after.pdf",
            ],            
        }
    ],
    [
        {
            "text": "CSV 파일 내용을 요약, 분석하라",
            "files": ["assets/additional-examples/sample-csv.csv"],
        }
    ],    
    [
        {
            "text": "이 영상의 내용을 설명하라",
            "files": ["assets/additional-examples/tmp.mp4"],
        }
    ],    
    [
        {
            "text": "표지 내용을 설명하고 글자를 읽어주세요.",
            "files": ["assets/additional-examples/maz.jpg"],
        }
    ],    
    [
        {
            "text": "이미 이 영양제를 <image> 가지고 있고, 이 제품 <image>을 새로 사려 합니다. 함께 섭취할 때 주의해야 할 점이 있을까요?",
            "files": ["assets/additional-examples/pill1.png", "assets/additional-examples/pill2.png"],
        }
    ],    
    [
        {
            "text": "이 적분을 풀어주세요.",
            "files": ["assets/additional-examples/4.png"],
        }
    ],    
    [
        {
            "text": "이 티켓은 언제 발급된 것이고, 가격은 얼마인가요?",
            "files": ["assets/additional-examples/2.png"],
        }
    ],    
    [
        {
            "text": "이미지들의 순서를 바탕으로 짧은 이야기를 만들어 주세요.",
            "files": [
                "assets/sample-images/09-1.png",
                "assets/sample-images/09-2.png",
                "assets/sample-images/09-3.png",
                "assets/sample-images/09-4.png",
                "assets/sample-images/09-5.png",
            ],
        }
    ],
    [
        {
            "text": "이미지의 시각적 요소에서 영감을 받아 시를 작성해주세요.",
            "files": ["assets/sample-images/06-1.png", "assets/sample-images/06-2.png"],
        }
    ],
    [
        {
            "text": "동일한 막대 그래프를 그리는 matplotlib 코드를 작성해주세요.",
            "files": ["assets/additional-examples/barchart.png"],
        }
    ],    

    [
        {
            "text": "이 세계에서 살고 있을 생물들을 상상해서 묘사해주세요.",
            "files": ["assets/sample-images/08.png"],
        }
    ],


    [
        {
            "text": "이미지에 있는 텍스트를 그대로 읽어서 마크다운 형태로 적어주세요.",
            "files": ["assets/additional-examples/3.png"],
        }
    ],


    [
        {
            "text": "이 표지판에는 무슨 문구가 적혀 있나요?",
            "files": ["assets/sample-images/02.png"],
        }
    ],
    [
        {
            "text": "두 이미지를 비교해서 공통점과 차이점을 말해주세요.",
            "files": ["assets/sample-images/03.png"],
        }
    ],

]


css = """
body {
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
}
.gradio-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    margin: 40px auto;
    max-width: 1200px;
}
.gradio-container h1 {
    color: #333;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}
.fillable { 
    width: 95% !important; 
    max-width: unset !important;
}
#examples_container {
    margin: auto;
    width: 90%;
}
#examples_row {
    justify-content: center;
}
.sidebar {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}
button, .btn {
    background: linear-gradient(90deg, #ff8a00, #e52e71);
    border: none;
    color: #fff;
    padding: 12px 24px;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 1px;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.2s ease-in-out;
}
button:hover, .btn:hover {
    transform: scale(1.05);
}
"""

title_html = """
<h1 align="center" style="margin-bottom: 0.2em;"> 🤗 Vidraft-Gemma-3-27B </h1>
<p align="center" style="font-size:1.1em; color:#555;">
    Multimodal Chat Interface + Optional Web Search
</p>
"""

with gr.Blocks(css=css, title="Vidraft-Gemma-3-27B") as demo:
    gr.Markdown(title_html)

    with gr.Row():
        # Left Sidebar
        with gr.Column(scale=3, variant="panel"):
            gr.Markdown("### Menu / Options")
            with gr.Row():
                web_search_checkbox = gr.Checkbox(
                    label="Web Search",
                    value=False,
                    info="Check to enable a SERPHouse web search before the chat reply"
                )
            # [중요] web_search_text는 사실상 사용 안 함 (자동추출로 검색)
            web_search_text = gr.Textbox(
                lines=1,
                label="(Unused) Web Search Query",
                placeholder="No direct input needed"
            )

            gr.Markdown("---")
            gr.Markdown("#### System Prompt")
            system_prompt_box = gr.Textbox(
                lines=3,
                value=(
                    "You are a deeply thoughtful AI. Consider problems thoroughly and derive "
                    "correct solutions through systematic reasoning. Please answer in korean."
                ),
            )

            max_tokens_slider = gr.Slider(
                label="Max New Tokens",
                minimum=100,
                maximum=8000,
                step=50,
                value=2000,
            )

            gr.Markdown("<br><br>")

        with gr.Column(scale=7):
            chat = gr.ChatInterface(
                fn=run,
                type="messages",
                chatbot=gr.Chatbot(type="messages", scale=1, allow_tags=["image"]),
                textbox=gr.MultimodalTextbox(
                    file_types=[
                        ".webp", ".png", ".jpg", ".jpeg", ".gif",
                        ".mp4", ".csv", ".txt", ".pdf"
                    ],
                    file_count="multiple",
                    autofocus=True
                ),
                multimodal=True,
                additional_inputs=[
                    system_prompt_box,
                    max_tokens_slider,
                    web_search_checkbox,
                    web_search_text,  # 실제로는 사용 안함
                ],
                stop_btn=False,
                title="Vidraft-Gemma-3-27B",
                examples=examples,
                run_examples_on_click=False,
                cache_examples=False,
                css_paths=None,
                delete_cache=(1800, 1800),
            )

    with gr.Row(elem_id="examples_row"):
        with gr.Column(scale=12, elem_id="examples_container"):
            gr.Markdown("### Example Inputs (click to load)")
            gr.Examples(
                examples=examples,
                inputs=[],  # Gradio가 dataset에 연결할 inputs가 없으므로 빈 리스트
                cache_examples=False
            )

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