#!/usr/bin/env python3
"""Minimal Streamlit interface for the EchoPilot ReAct agent."""

from __future__ import annotations

import tempfile
import uuid
from pathlib import Path
from typing import Dict, List, Tuple

import streamlit as st

from agents import get_intelligent_agent
from config import Config
from utils.video_utils import convert_video_to_h264

PROJECT_ROOT = Path(__file__).resolve().parent


@st.cache_resource(show_spinner=False)
def load_agent():
    IntelligentAgent, _ = get_intelligent_agent()
    return IntelligentAgent(device=Config.DEVICE)


def _persist_upload(upload) -> Tuple[Path, Path]:
    """Write uploaded file to a temporary directory and return its path."""
    suffix = Path(upload.name or "input.mp4").suffix or ".mp4"
    temp_dir = Path(tempfile.mkdtemp(prefix="echopilot_"))
    video_path = temp_dir / f"input{suffix}"
    with open(video_path, "wb") as handle:
        handle.write(upload.getbuffer())
    return video_path, temp_dir


def _extract_key_metrics(response) -> List[Tuple[str, str]]:
    metrics: List[Tuple[str, str]] = []
    results = response.execution_result.results or {}
    tool_results: Dict[str, Dict] = results.get("tool_results") or {}
    measurement = tool_results.get("echo_measurement_prediction")
    if isinstance(measurement, dict) and measurement.get("status") == "success":
        entries = measurement.get("measurements") or []
        if entries:
            data = entries[0].get("measurements", {})

            def _format_metric(key: str, label: str, precision: int = 1):
                info = data.get(key)
                if not isinstance(info, dict):
                    return
                value = info.get("value")
                unit = info.get("unit", "")
                if value is None:
                    return
                try:
                    value_str = f"{float(value):.{precision}f}"
                except (TypeError, ValueError):
                    value_str = str(value)
                unit_str = f" {unit}".strip()
                metrics.append((label, f"{value_str}{unit_str}"))

            for key, label in [
                ("ejection_fraction", "Ejection Fraction"),
                ("EF", "Ejection Fraction"),
            ]:
                if key in data:
                    _format_metric(key, label, precision=1)
                    break

            if "pulmonary_artery_pressure_continuous" in data:
                _format_metric("pulmonary_artery_pressure_continuous", "Pulmonary Artery Pressure", precision=1)
            if "dilated_ivc" in data:
                _format_metric("dilated_ivc", "IVC Diameter", precision=2)
    return metrics


def main() -> None:
    st.set_page_config(page_title="EchoPilot Agent", page_icon="🫀", layout="wide")
    st.title("EchoPilot · Echocardiography Co-Pilot")
    st.caption("Upload a study, ask a focused question, and EchoPilot will run the appropriate tools to answer.")

    upload_col, info_col = st.columns([2, 1])
    with upload_col:
        uploaded_video = st.file_uploader(
            "Echo video file",
            type=["mp4", "mov", "m4v", "avi", "wmv"],
            help="Standard ultrasound formats are supported.",
        )
        default_question = "Estimate the ejection fraction and note any major abnormalities."
        query = st.text_area("Clinical question", value=default_question, height=120)
    with info_col:
        st.markdown("### How it works")
        st.write(
            "- EchoPilot uses a ReAct loop to decide which tools to call.\n"
            "- It may segment chambers, compute EchoPrime measurements, or run disease classifiers.\n"
            "- Results are summarized below; raw tool logs are hidden for clarity."
        )

    response = None
    display_video: Path | None = None

    run_clicked = st.button("Run Analysis", type="primary", use_container_width=True, disabled=not uploaded_video or not query.strip())
    if run_clicked:
        agent = load_agent()
        video_path, temp_dir = _persist_upload(uploaded_video)
        temp_display_dir = PROJECT_ROOT / "temp"
        temp_display_dir.mkdir(parents=True, exist_ok=True)
        display_target = temp_display_dir / f"display_{uuid.uuid4().hex}.mp4"
        display_video = Path(convert_video_to_h264(str(video_path), str(display_target)))

        with st.spinner("EchoPilot is analyzing the study..."):
            response = agent.process_query(query.strip(), str(video_path))

        # Clean up the original upload to save disk space
        if temp_dir.exists():
            for item in temp_dir.iterdir():
                item.unlink(missing_ok=True)
            temp_dir.rmdir()

    if response:
        st.success("Analysis complete")
        metrics = _extract_key_metrics(response)

        container = st.container()
        video_col, metrics_col = container.columns([2, 1])
        if display_video and display_video.exists():
            with video_col:
                st.video(str(display_video))
        if metrics:
            with metrics_col:
                st.markdown("#### Key Measurements")
                for label, value in metrics:
                    st.metric(label, value)

        st.divider()
        st.markdown("#### EchoPilot Response")
        st.chat_message("user").write(query.strip())
        st.chat_message("assistant").write(response.response_text)


if __name__ == "__main__":
    main()