import sys
import os
import pandas as pd
import json
import gradio as gr
from typing import List, Tuple, Union, Generator
import hashlib
import shutil
import re
from datetime import datetime
from concurrent.futures import ThreadPoolExecutor, as_completed

# Setup directories
persistent_dir = "/data/hf_cache"
os.makedirs(persistent_dir, exist_ok=True)

model_cache_dir = os.path.join(persistent_dir, "txagent_models")
tool_cache_dir = os.path.join(persistent_dir, "tool_cache")
file_cache_dir = os.path.join(persistent_dir, "cache")
report_dir = os.path.join(persistent_dir, "reports")

for d in [model_cache_dir, tool_cache_dir, file_cache_dir, report_dir]:
    os.makedirs(d, exist_ok=True)

os.environ["HF_HOME"] = model_cache_dir
os.environ["TRANSFORMERS_CACHE"] = model_cache_dir

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "src")))
from txagent.txagent import TxAgent

MAX_MODEL_TOKENS = 32768
MAX_CHUNK_TOKENS = 8192
MAX_NEW_TOKENS = 2048
PROMPT_OVERHEAD = 500

def clean_response(text: str) -> str:
    text = re.sub(r"\[.*?\]|\bNone\b", "", text, flags=re.DOTALL)
    text = re.sub(r"\n{3,}", "\n\n", text)
    text = re.sub(r"[^\n#\-\*\w\s\.,:\(\)]+", "", text)
    return text.strip()

def estimate_tokens(text: str) -> int:
    return len(text) // 3.5 + 1

def extract_text_from_excel(file_obj: Union[str, os.PathLike, 'file']) -> str:
    all_text = []
    try:
        xls = pd.ExcelFile(file_obj)
    except Exception as e:
        raise ValueError(f"❌ Error reading Excel file: {e}")
    for sheet_name in xls.sheet_names:
        df = xls.parse(sheet_name).astype(str).fillna("")
        rows = df.apply(lambda row: " | ".join([cell for cell in row if cell.strip()]), axis=1)
        sheet_text = [f"[{sheet_name}] {line}" for line in rows if line.strip()]
        all_text.extend(sheet_text)
    return "\n".join(all_text)

def split_text_into_chunks(text: str, max_tokens: int = MAX_CHUNK_TOKENS, max_chunks: int = 30) -> List[str]:
    effective_max = max_tokens - PROMPT_OVERHEAD
    lines, chunks, curr_chunk, curr_tokens = text.split("\n"), [], [], 0
    for line in lines:
        t = estimate_tokens(line)
        if curr_tokens + t > effective_max:
            if curr_chunk:
                chunks.append("\n".join(curr_chunk))
            if len(chunks) >= max_chunks:
                break
            curr_chunk, curr_tokens = [line], t
        else:
            curr_chunk.append(line)
            curr_tokens += t
    if curr_chunk and len(chunks) < max_chunks:
        chunks.append("\n".join(curr_chunk))
    return chunks

def build_prompt_from_text(chunk: str) -> str:
    return f"""
### Unstructured Clinical Records

Analyze the following clinical notes and provide a detailed, concise summary focusing on:
- Diagnostic Patterns
- Medication Issues
- Missed Opportunities
- Inconsistencies
- Follow-up Recommendations

---

{chunk}

---
Respond in well-structured bullet points with medical reasoning.
"""

def init_agent():
    tool_path = os.path.join(tool_cache_dir, "new_tool.json")
    if not os.path.exists(tool_path):
        shutil.copy(os.path.abspath("data/new_tool.json"), tool_path)
    agent = TxAgent(
        model_name="mims-harvard/TxAgent-T1-Llama-3.1-8B",
        rag_model_name="mims-harvard/ToolRAG-T1-GTE-Qwen2-1.5B",
        tool_files_dict={"new_tool": tool_path},
        force_finish=True,
        enable_checker=True,
        step_rag_num=4,
        seed=100
    )
    agent.init_model()
    return agent

def stream_report_wrapper(agent):
    def wrapped(file: Union[str, 'file'], full_output: str) -> Generator:
        accumulated_text = ""
        try:
            if file is None:
                yield "❌ Please upload a valid Excel file.", None, ""
                return

            if hasattr(file, "read"):
                text = extract_text_from_excel(file)
            elif isinstance(file, str) and os.path.exists(file):
                text = extract_text_from_excel(file)
            else:
                raise ValueError("❌ Invalid or missing file.")

            chunks = split_text_into_chunks(text)

            for i, chunk in enumerate(chunks):
                prompt = build_prompt_from_text(chunk)
                partial = ""
                for res in agent.run_gradio_chat(
                    message=prompt, history=[], temperature=0.2,
                    max_new_tokens=MAX_NEW_TOKENS, max_token=MAX_MODEL_TOKENS,
                    call_agent=False, conversation=[]
                ):
                    if isinstance(res, str):
                        partial += res
                    elif hasattr(res, "content"):
                        partial += res.content
                cleaned = clean_response(partial)
                accumulated_text += f"\n\n📄 **Chunk {i+1}**:\n{cleaned}"
                yield accumulated_text, None, ""

            summary_prompt = f"Summarize this analysis in a final structured report:\n\n" + accumulated_text
            final_report = ""
            for res in agent.run_gradio_chat(
                message=summary_prompt, history=[], temperature=0.2,
                max_new_tokens=MAX_NEW_TOKENS, max_token=MAX_MODEL_TOKENS,
                call_agent=False, conversation=[]
            ):
                if isinstance(res, str):
                    final_report += res
                elif hasattr(res, "content"):
                    final_report += res.content

            cleaned = clean_response(final_report)
            accumulated_text += f"\n\n📊 **Final Summary**:\n{cleaned}"
            report_path = os.path.join(report_dir, f"report_{datetime.now().strftime('%Y%m%d_%H%M%S')}.md")
            with open(report_path, 'w') as f:
                f.write(f"# 🧠 Final Patient Report\n\n{cleaned}")

            yield accumulated_text, report_path, cleaned

        except Exception as e:
            yield f"❌ Error: {str(e)}", None, ""

    return wrapped

def create_ui(agent):
    with gr.Blocks(css="""
        body {
            background: #10141f;
            color: #ffffff;
            font-family: 'Inter', sans-serif;
            margin: 0;
            padding: 0;
        }
        .gradio-container {
            padding: 30px;
            width: 100vw;
            max-width: 100%;
            border-radius: 0;
            background-color: #1a1f2e;
        }
        .output-markdown {
            background-color: #131720;
            border-radius: 12px;
            padding: 20px;
            min-height: 600px;
            overflow-y: auto;
            border: 1px solid #2c3344;
        }
        .gr-button {
            background: linear-gradient(135deg, #4b4ced, #37b6e9);
            color: white;
            font-weight: 500;
            border: none;
            padding: 10px 20px;
            border-radius: 8px;
            transition: background 0.3s ease;
        }
        .gr-button:hover {
            background: linear-gradient(135deg, #37b6e9, #4b4ced);
        }
    """) as demo:
        gr.Markdown("""# 🧠 Clinical Reasoning Assistant
Upload clinical Excel records below and click **Analyze** to generate a medical summary.
""")
        file_upload = gr.File(label="Upload Excel File", file_types=[".xlsx"])
        analyze_btn = gr.Button("Analyze")
        report_output_markdown = gr.Markdown(elem_classes="output-markdown")
        report_file = gr.File(label="Download Report", visible=False)
        full_output = gr.State(value="")

        streaming_fn = stream_report_wrapper(agent)

        def run_streaming(file, state):
            return streaming_fn(file, state)

        analyze_btn.click(
            fn=run_streaming,
            inputs=[file_upload, full_output],
            outputs=[report_output_markdown, report_file, full_output]
        )

    return demo

if __name__ == "__main__":
    try:
        agent = init_agent()
        demo = create_ui(agent)
        demo.launch(server_name="0.0.0.0", server_port=7860, allowed_paths=["/data/hf_cache/reports"], share=False)
    except Exception as e:
        print(f"Error: {str(e)}")
        sys.exit(1)