"""Audio Labeling Tool — Streamlit Application Entry Point."""

import base64
import logging
import os

import streamlit as st

from admin_panel import render_admin_panel
from auth import authenticate, login, logout
from audio_loader import copy_to_clean, load_audio_bytes
from config import load_config
from csv_persistence import save_label
from models import LabelRecord
from reference import load_reference
from resume import build_file_list, compute_resume_index
from skip_persistence import save_skip

# --- Logging Setup ---
LOG_DIR = os.environ.get("LOG_DIR", "/app/logs")
os.makedirs(LOG_DIR, exist_ok=True)

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
    handlers=[
        logging.FileHandler(os.path.join(LOG_DIR, "app.log")),
        logging.StreamHandler(),
    ],
)
logger = logging.getLogger(__name__)

# --- Page Config ---
st.set_page_config(page_title="Audio Labeling Tool", layout="wide")


def init_session_state():
    """Initialize session state defaults."""
    if "authenticated" not in st.session_state:
        st.session_state["authenticated"] = False
    if "username" not in st.session_state:
        st.session_state["username"] = None
    if "role" not in st.session_state:
        st.session_state["role"] = None


def render_login():
    """Render the login view."""
    st.title("Audio Labeling Tool")
    st.subheader("Login")

    username = st.text_input("Username", key="login_username")
    password = st.text_input("Password", type="password", key="login_password")

    if st.button("Login"):
        if not username or not password:
            st.error("Please enter both username and password.")
            return

        try:
            role = authenticate(username, password)
            if role:
                login(username, role)
                st.rerun()
            else:
                st.error("Invalid username or password.")
        except Exception:
            st.error("Invalid username or password.")


def get_labeler_config(username: str) -> dict:
    """Get the configuration for the current labeler."""
    config = load_config()
    return config["labelers"][username]


def initialize_labeling_session(username: str):
    """Initialize the labeling session: build file list, load reference, compute resume."""
    if "file_list" in st.session_state:
        return  # Already initialized

    labeler_cfg = get_labeler_config(username)
    audio_folder = labeler_cfg["audio_folder"]
    reference_json = labeler_cfg["reference_json"]
    output_dir = labeler_cfg["output_dir"]
    csv_path = os.path.join(output_dir, f"{username}_metadata.csv")

    # Build file list
    file_list = build_file_list(audio_folder)
    st.session_state["file_list"] = file_list
    st.session_state["audio_folder"] = audio_folder
    st.session_state["csv_path"] = csv_path
    st.session_state["output_dir"] = output_dir
    st.session_state["clean_audios_dir"] = labeler_cfg["clean_audios_dir"]

    # Load reference JSON
    try:
        reference = load_reference(reference_json)
        st.session_state["reference"] = reference
        st.session_state["reference_error"] = None
    except (FileNotFoundError, ValueError) as e:
        st.session_state["reference"] = {}
        st.session_state["reference_error"] = str(e)

    # Compute resume index
    resume_index = compute_resume_index(file_list, csv_path, username)
    st.session_state["current_index"] = resume_index


def render_audio_player(audio_bytes: bytes):
    """Render HTML5 audio player with speed control."""
    audio_b64 = base64.b64encode(audio_bytes).decode("utf-8")
    audio_html = f"""
    <audio id="audio-player" controls style="width: 100%;">
        <source src="data:audio/wav;base64,{audio_b64}" type="audio/wav">
        Your browser does not support the audio element.
    </audio>
    <script>
        var audio = document.getElementById('audio-player');
        var rate = document.getElementById('playback-rate');
        if (rate) {{
            audio.playbackRate = parseFloat(rate.value);
        }}
    </script>
    """
    st.markdown(audio_html, unsafe_allow_html=True)


def render_labeling_ui():
    """Render the main labeling interface."""
    username = st.session_state["username"]

    # Header with logout
    col_title, col_logout = st.columns([4, 1])
    with col_title:
        st.title("Audio Labeling Tool")
    with col_logout:
        if st.button("Logout"):
            logout()
            st.rerun()

    # Initialize session
    initialize_labeling_session(username)

    # Check for reference loading error
    if st.session_state.get("reference_error"):
        st.error(
            "Reference file is corrupted or missing. Please contact admin."
        )
        st.stop()

    file_list = st.session_state["file_list"]
    current_index = st.session_state["current_index"]
    audio_folder = st.session_state["audio_folder"]
    reference = st.session_state["reference"]

    # Handle completion
    if not file_list:
        st.warning("No audio files found in your assigned folder.")
        st.stop()

    if current_index >= len(file_list):
        st.success("All items have been labeled! You're done.")
        if st.button("← Go to last item"):
            st.session_state["current_index"] = len(file_list) - 1
            st.rerun()
        st.stop()

    # Current file info
    current_filename = file_list[current_index]

    # Position indicator
    st.markdown(f"**{current_index + 1} / {len(file_list)}** — `{current_filename}`")

    # Audio player
    try:
        audio_bytes = load_audio_bytes(audio_folder, current_filename)
        render_audio_player(audio_bytes)
    except FileNotFoundError:
        st.error(f"Audio file not found: {current_filename}. Please contact admin.")

    # Speed control
    speed = st.select_slider(
        "Playback Speed",
        options=[0.5, 0.75, 1.0, 1.25, 1.5, 2.0],
        value=1.0,
        key="speed_slider",
    )
    # Update playback rate via JS
    st.markdown(
        f"""<script>
        var audio = document.getElementById('audio-player');
        if (audio) {{ audio.playbackRate = {speed}; }}
        </script>""",
        unsafe_allow_html=True,
    )

    st.divider()

    # Transcription
    default_transcription = reference.get(current_filename, "")
    if not default_transcription and current_filename not in reference:
        st.warning(f"No transcription found for: {current_filename}")

    transcription = st.text_area(
        "Transcription",
        value=default_transcription,
        height=100,
        key=f"transcription_{current_index}",
    )

    # Metadata
    col_gender, col_pii = st.columns(2)
    with col_gender:
        gender = st.radio(
            "Gender",
            options=["male", "female"],
            key=f"gender_{current_index}",
        )
    with col_pii:
        pii = st.checkbox("Contains PII", key=f"pii_{current_index}")

    st.divider()

    # Navigation and action buttons
    col_prev, col_next, col_apply, col_skip = st.columns(4)

    with col_prev:
        prev_disabled = current_index <= 0
        if st.button("← Previous", disabled=prev_disabled):
            st.session_state["current_index"] = current_index - 1
            st.rerun()

    with col_next:
        next_disabled = current_index >= len(file_list) - 1
        if st.button("Next →", disabled=next_disabled):
            st.session_state["current_index"] = current_index + 1
            st.rerun()

    with col_apply:
        if st.button("✓ Apply", type="primary"):
            # Build record
            record = LabelRecord(
                source=current_filename,
                transcription=transcription,
                gender=gender,
                pii=pii,
                labeler=username,
            )

            csv_path = st.session_state["csv_path"]
            clean_audios_dir = st.session_state["clean_audios_dir"]

            try:
                # Save to CSV
                save_label(record, csv_path)
                # Copy audio to clean folder
                copy_to_clean(audio_folder, current_filename, clean_audios_dir)
                # Advance pointer only on success
                st.session_state["current_index"] = current_index + 1
                st.rerun()
            except IOError as e:
                st.error(str(e))
                # Pointer NOT advanced

    with col_skip:
        skip_disabled = current_index >= len(file_list) - 1
        if st.button("Skip ✗", disabled=skip_disabled):
            st.session_state["show_skip_reason"] = True
            st.rerun()

    # Skip reason dialog
    if st.session_state.get("show_skip_reason", False):
        st.divider()
        st.markdown("**Why are you skipping this audio?**")

        config = load_config()
        skip_reasons = config.get("skip_reasons", ["Other"])

        reason_choice = st.selectbox(
            "Select reason",
            options=skip_reasons,
            key=f"skip_reason_select_{current_index}",
        )

        custom_reason = ""
        if reason_choice == "Other":
            custom_reason = st.text_input(
                "Please specify:", key=f"skip_custom_reason_{current_index}"
            )

        col_confirm, col_cancel = st.columns(2)
        with col_confirm:
            if st.button("Confirm Skip"):
                final_reason = custom_reason if reason_choice == "Other" else reason_choice
                if reason_choice == "Other" and not custom_reason.strip():
                    st.error("Please provide a reason.")
                else:
                    shared_output_dir = config["shared_output_dir"]
                    skip_csv_path = os.path.join(shared_output_dir, "skipped_audios.csv")
                    try:
                        save_skip(username, current_filename, final_reason, skip_csv_path)
                        st.session_state["show_skip_reason"] = False
                        st.session_state["current_index"] = current_index + 1
                        st.rerun()
                    except IOError as e:
                        st.error(str(e))

        with col_cancel:
            if st.button("Cancel"):
                st.session_state["show_skip_reason"] = False
                st.rerun()


def main():
    """Main application entry point."""
    init_session_state()

    if st.session_state["authenticated"]:
        role = st.session_state.get("role")
        if role == "admin":
            render_admin_panel()
        else:
            render_labeling_ui()
    else:
        render_login()


if __name__ == "__main__":
    main()