"""
Atlas - Minimal VAD version based on Gradio's official pattern
"""

import gradio as gr
import asyncio
import logging
import tempfile
import numpy as np
import wave
import io
import time
import re
import ast
import json
import os
import sys
import atexit
import subprocess

from dataclasses import dataclass, field
from pathlib import Path
from typing import Optional, List, Dict, Tuple

from services.mcp_client import MCPClient
from services.audio_service import AudioService
from services.llm_service import LLMService
from services.screen_service import get_screen_service
from config.settings import Settings
from config.prompts import get_generic_prompt

from openai import OpenAI

logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)


# ============================================
# App State (like Gradio's official example)
# ============================================

@dataclass
class AppState:
    stream: Optional[np.ndarray] = None
    sampling_rate: int = 0
    pause_detected: bool = False
    started_talking: bool = False
    stopped: bool = False
    conversation: List[Dict] = field(default_factory=list)


# ============================================
# VAD Helper
# ============================================

def detect_pause(audio: np.ndarray, sr: int, state: AppState) -> bool:
    """Simple energy-based pause detection."""
    if audio is None or len(audio) < sr * 0.3:
        return False
    
    # Look at last 0.5 seconds
    window = int(sr * 0.5)
    recent = audio[-window:] if len(audio) >= window else audio
    
    # Energy
    recent_float = recent.astype(np.float32)
    if recent.dtype == np.int16:
        recent_float = recent_float / 32768.0
    energy = float(np.sqrt(np.mean(recent_float ** 2)))
    
    SILENCE_THRESHOLD = 0.01
    
    # If earlier was loud and now quiet = pause
    if len(audio) > window * 2:
        earlier = audio[:-window]
        earlier_float = earlier.astype(np.float32)
        if earlier.dtype == np.int16:
            earlier_float = earlier_float / 32768.0
        earlier_energy = float(np.sqrt(np.mean(earlier_float ** 2)))
        
        if earlier_energy > SILENCE_THRESHOLD * 2 and energy < SILENCE_THRESHOLD:
            logger.info(f"Pause: earlier={earlier_energy:.4f}, now={energy:.4f}")
            return True
    
    return False


def audio_to_wav_file(audio: np.ndarray, sr: int) -> str:
    """Save audio to temp WAV file."""
    audio_float = audio.astype(np.float32)
    max_val = np.max(np.abs(audio_float))
    if max_val > 0:
        audio_float = audio_float / max_val
    audio_int = (audio_float * 32767).astype(np.int16)
    
    tmp = tempfile.NamedTemporaryFile(delete=False, suffix=".wav")
    with wave.open(tmp.name, 'wb') as w:
        w.setnchannels(1)
        w.setsampwidth(2)
        w.setframerate(sr)
        w.writeframes(audio_int.tobytes())
    return tmp.name

# ============================================
# MCP
# ============================================

def start_mcp_server():
    """
    Start the local CRM MCP server (crm_mcp_server.py) in a background process.

    Controlled by Settings.mcp_auto_start (MCP_AUTO_START env var).
    """
    settings = Settings()
    if not getattr(settings, "mcp_auto_start", True):
        logger.info("MCP auto-start disabled via settings.")
        return None

    script_path = os.path.join(os.path.dirname(__file__), "crm_mcp_server.py")
    cmd = [sys.executable, script_path]

    try:
        proc = subprocess.Popen(
            cmd,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )
        logger.info(f"Started CRM MCP server (PID={proc.pid}) using: {cmd}")
    except Exception as e:
        logger.error(f"Failed to start CRM MCP server: {e}")
        return None

    # Ensure child process is cleaned up when app exits
    def _cleanup():
        if proc.poll() is None:
            logger.info("Stopping CRM MCP server...")
            try:
                proc.terminate()
            except Exception:
                pass

    atexit.register(_cleanup)
    return proc


# ============================================
# Chatbot
# ============================================


TOOL_CALL_RE = re.compile(
    r'^\s*([a-zA-Z_][\w]*)\s*\((.*)\)\s*$', re.DOTALL
)


def parse_tool_call(text: str):
    """
    Extract tool_name and kwargs from something like:
        tool_name(a=1, b="x")
    Works even if surrounded by chatter or code fences.
    """
    # Remove code fences
    cleaned = text.strip()
    if "```" in cleaned:
        parts = cleaned.split("```")
        if len(parts) >= 2:
            cleaned = parts[1]

    # Find last candidate line
    pattern = re.compile(r'^([a-zA-Z_]\w*)\s*\((.*)\)\s*$')
    for line in reversed(cleaned.splitlines()):
        line = line.strip()
        m = pattern.match(line)
        if not m:
            continue

        print(f"Tool call: {line}")

        name, args_src = m.groups()
        args_src = args_src.strip()

        # No args
        if not args_src:
            return name, {}

        try:
            func_src = f"def _f({args_src}): pass"
            module = ast.parse(func_src)
            func_def = module.body[0]          # ast.FunctionDef
            args = func_def.args

            kwargs = {}
            for arg, default in zip(args.args, args.defaults):
                key = arg.arg
                value = ast.literal_eval(default)
                kwargs[key] = value

            return name, kwargs

        except Exception as e:
            print("Argument parse error:", e)
            return None

    return None

class Chatbot:
    def __init__(self):
        self.settings = Settings()
        self.audio_service = AudioService(
            api_key=self.settings.hf_token,
            stt_provider="fal-ai",
            stt_model=self.settings.stt_model,
            tts_model=self.settings.tts_model,
        )
        self.llm_service = LLMService(
            api_key=self.settings.llm_api_key,
            model_name=self.settings.effective_model_name,
        )
        self.vision_client = OpenAI(
            base_url=self.settings.NEBIUS_BASE_URL,
            api_key=self.settings.NEBIUS_API_KEY
        )
        self.vision_model = self.settings.NEBIUS_MODEL
        self.screen_service = get_screen_service()
        self.history: list[dict] = []

        self.mcp = MCPClient()
        try:
            self.tools = self.mcp.list_tools()
        except Exception as e:
            # fail gracefully, tools just won’t be used
            logging.exception("Failed to load tools from MCP server: %s", e)
            self.tools = []

        self.tools_description = self._build_tools_description()

    def _build_tools_description(self) -> str:
        """Build a human-readable list of tools for the system prompt."""
        if not getattr(self, "tools", None):
            return "No tools are currently available."

        lines = []
        for t in self.tools:
            name = t.get("name", "unknown_tool")
            desc = t.get("description", "")
            props = t.get("inputSchema", {}).get("properties", {})
            args = ", ".join(
                f'{k}: {v.get("type", "string")}'
                for k, v in props.items()
            )
            lines.append(f"- {name}({args}) — {desc}")
        return "\n".join(lines)

    async def process(self, text: str, tts_enabled: bool = True) -> Tuple[str, Optional[str]]:
        if not text.strip():
            return "", None

        # ---------- Phase 1: ask model what to do ----------
        messages = self.llm_service.build_messages_with_tools(
            system_prompt=get_generic_prompt(),
            user_input=text,
            tools_description=self.tools_description,
            conversation_history=self.history,
        )

        first_reply = await self.llm_service.get_chat_completion(messages)

        # Try to parse a tool call from the reply
        tool_call = parse_tool_call(first_reply)
        tool_result_str = None

        if tool_call:
            tool_name, tool_args = tool_call
            try:
                result = self.mcp.call_tool(tool_name, tool_args)
                tool_result_str = (
                    f"Tool {tool_name} succeeded with arguments {tool_args}.\n"
                    f"Result (JSON):\n{json.dumps(result, indent=2)}"
                )
            except Exception as e:
                tool_result_str = f"Tool {tool_name} failed: {e}"

            # ---------- Phase 2: give tool result back to model ----------
            messages = self.llm_service.build_messages_with_tools(
                system_prompt=get_generic_prompt(),
                user_input=text,
                tools_description=self.tools_description,
                conversation_history=self.history,
                tool_results=tool_result_str,
            )
            reply = await self.llm_service.get_chat_completion(messages)
        else:
            # No tool call – just treat initial text as final answer
            reply = first_reply

        # Save final user + assistant messages in conversation history
        self.history.append({"role": "user", "content": text})
        self.history.append({"role": "assistant", "content": reply})

        # ---------- Optional: TTS ----------
        audio_path = None
        if tts_enabled:
            audio_bytes = await self.audio_service.text_to_speech(reply)
            if audio_bytes:
                tmp = tempfile.NamedTemporaryFile(delete=False, suffix=".wav")
                tmp.write(audio_bytes)
                tmp.close()
                audio_path = tmp.name

        return reply, audio_path


    async def transcribe(self, audio_path: str) -> str:
        return await self.audio_service.speech_to_text(audio_path)

    async def capture_screen(self, state: AppState, tts_enabled: bool) -> Tuple[List[Dict], Optional[str], AppState, str]:
        """Capture screen and send to vision model."""
        # Capture screenshot
        capture = self.screen_service.capture()
        if not capture:
            return state.conversation, None, state, "❌ Capture failed"
        
        logger.info(f"Screenshot captured: {capture.width}x{capture.height}")
        
        # Send to vision model
        try:
            response = await asyncio.get_event_loop().run_in_executor(
                None,
                lambda: self.vision_client.chat.completions.create(
                    model=self.vision_model,
                    messages=[{
                        "role": "user",
                        "content": [
                            {"type": "text", "text": "Ignore the ATLAS interface on the left-most side of the screen. Describe the content of the main window."},
                            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{capture.image_b64}"}}
                        ]
                    }]
                )
            )
            analysis = response.choices[0].message.content
        except Exception as e:
            logger.error(f"Vision error: {e}")
            return state.conversation, None, state, f"❌ {str(e)}"
        
        # Process through main LLM
        reply, audio_path = await self.process(f"[Screen analysis]: {analysis}", tts_enabled)
        
        state.conversation.append({"role": "user", "content": "[Screen captured]"})
        state.conversation.append({"role": "assistant", "content": f"Vision output: {reply}. Incorporate the data in your context. Do not call any tool yet, await for further instructions."})
        
        return state.conversation, audio_path, state, "📸 Done"

# Start MCP server as soon as this module is imported
mcp_proc = start_mcp_server()

# Give it a brief moment to bind to the port
time.sleep(1.0)

bot = None  # type: ignore


def tokens_present() -> bool:
    """Check whether required env vars are already available."""
    return bool(os.getenv("HF_TOKEN")) and bool(os.getenv("NEBIUS_API_KEY"))


ENV_PATH = Path(__file__).parent / ".env"

def upsert_env_var(key: str, value: str):
    """
    Update or append env var in .env file so it persists across runs.
    Simple key=value per line, no fancy parsing.
    """
    if not value:
        return

    lines = []
    if ENV_PATH.exists():
        lines = ENV_PATH.read_text(encoding="utf-8").splitlines()

    found = False
    for i, line in enumerate(lines):
        if line.startswith(f"{key}="):
            lines[i] = f"{key}={value}"
            found = True
            break

    if not found:
        lines.append(f"{key}={value}")

    ENV_PATH.write_text("\n".join(lines) + "\n", encoding="utf-8")


def ensure_bot_initialized() -> Optional[str]:
    """
    Initialize the global Chatbot if tokens are present.
    Returns an error message if tokens are missing, otherwise None.
    """
    global bot

    if bot is not None:
        return None

    hf_token = os.getenv("HF_TOKEN", "")
    if not hf_token or len(hf_token) <= 10:
        return "⚠️ HF_TOKEN missing or invalid. Please fill it in the Setup section."

    # Optional debug: see what we are about to use
    settings = Settings()
    logger.info(
        f"Initializing Chatbot with HF token prefix={settings.hf_token[:4]}..., len={len(settings.hf_token)}"
    )

    bot = Chatbot()
    return None


def save_tokens(hf_token: str, nebius_api_key: str) -> str:
    # basic sanity check
    if hf_token and not hf_token.strip().startswith("hf_"):
        return "❌ HF_TOKEN does not look like a Hugging Face token (should start with 'hf_')."

    if hf_token:
        os.environ["HF_TOKEN"] = hf_token.strip()
        upsert_env_var("HF_TOKEN", hf_token.strip())

    if nebius_api_key:
        os.environ["NEBIUS_API_KEY"] = nebius_api_key.strip()
        upsert_env_var("NEBIUS_API_KEY", nebius_api_key.strip())

    # NOW build Chatbot + LLMService with the *current* env
    err = ensure_bot_initialized()
    if err:
        return err
    return "✅ Tokens saved and assistant initialized. You can now use Atlas."

def check_tokens_on_load():
    if tokens_present():
        # env already has HF_TOKEN/NEBIUS_API_KEY: build Chatbot immediately
        err = ensure_bot_initialized()
        msg = "✅ Tokens loaded from .env. Atlas is ready." if not err else err

        return (
            gr.update(visible=False),  # hf_token_box
            gr.update(visible=False),  # nebius_key_box
            msg,
        )
    else:
        return (
            gr.update(visible=True),
            gr.update(visible=True),
            "⚠️ Please paste your HF_TOKEN and NEBIUS_API_KEY to start.",
        )


# ============================================
# Gradio Handlers
# ============================================

def process_audio(audio: tuple, state: AppState):
    """Process audio chunk. Return gr.Audio(recording=False) to stop."""
    if audio is None:
        return None, state
    
    sr, data = audio
    
    # Mono
    if data.ndim > 1:
        data = data.mean(axis=1)
    
    # Accumulate
    if state.stream is None:
        state.stream = data
        state.sampling_rate = sr
    else:
        state.stream = np.concatenate((state.stream, data))
    
    # Energy check
    data_float = data.astype(np.float32)
    if data.dtype == np.int16:
        data_float = data_float / 32768.0
    energy = float(np.sqrt(np.mean(data_float ** 2)))
    
    if energy > 0.015:
        state.started_talking = True
        logger.debug(f"Talking: energy={energy:.4f}")
    
    # Pause check
    state.pause_detected = detect_pause(state.stream, state.sampling_rate, state)
    
    if state.pause_detected and state.started_talking:
        logger.info("Pause detected - stopping recording")
        return gr.Audio(recording=False), state
    
    return None, state


async def respond(state: AppState, tts_enabled: bool):
    """Transcribe and respond when recording stops."""
    if bot is None:
        msg = "⚠️ Configure HF_TOKEN and NEBIUS_API_KEY in the Setup section before using voice."
        state.conversation.append({"role": "assistant", "content": msg})
        return None, AppState(conversation=state.conversation), state.conversation

    if state.stream is None or len(state.stream) < 1000:
        logger.info("No audio")
        return None, AppState(conversation=state.conversation), state.conversation
    
    logger.info(f"Processing {len(state.stream)} samples...")
    
    wav_path = audio_to_wav_file(state.stream, state.sampling_rate)
    transcript = await bot.transcribe(wav_path)
    logger.info(f"Transcript: {transcript}")
    
    if not transcript.strip():
        return None, AppState(conversation=state.conversation), state.conversation
    
    reply, audio_path = await bot.process(transcript, tts_enabled)
    
    state.conversation.append({"role": "user", "content": transcript})
    state.conversation.append({"role": "assistant", "content": reply})
    
    return audio_path, AppState(conversation=state.conversation), state.conversation


def start_recording(state: AppState):
    """Restart recording."""
    if not state.stopped:
        return gr.Audio(recording=True)
    return gr.Audio(recording=False)


async def send_text(text: str, state: AppState, tts_enabled: bool):
    if not text.strip():
        return state.conversation, None, state, ""

    if bot is None:
        msg = "⚠️ Configure HF_TOKEN and NEBIUS_API_KEY in the Setup section before chatting."
        state.conversation.append({"role": "assistant", "content": msg})
        return state.conversation, None, state, ""

    reply, audio_path = await bot.process(text, tts_enabled)
    state.conversation.append({"role": "user", "content": text})
    state.conversation.append({"role": "assistant", "content": reply})
    
    return state.conversation, audio_path, state, ""


async def capture_screen_handler(state: AppState, tts_enabled: bool):
    if bot is None:
        msg = "⚠️ Configure HF_TOKEN and NEBIUS_API_KEY in the Setup section before using screen capture."
        return state.conversation, None, state, msg

    return await bot.capture_screen(state, tts_enabled)


# ============================================
# UI
# ============================================

with gr.Blocks(title="ATLAS") as demo:
    gr.Markdown("### Atlas - CRM Voice Assistant")
    
    state = gr.State(value=AppState())
    
    with gr.Row():
        with gr.Column(scale=2):
            chatbot = gr.Chatbot(label="Conversation", height=400)
            
            with gr.Row():
                txt = gr.Textbox(placeholder="Type here your message...", label="Input", scale=4)
                send_btn = gr.Button("Send", scale=1)
        
        with gr.Column(scale=1):
            # 🔐 Setup section
            gr.Markdown("### Setup (API keys)")
            hf_token_box = gr.Textbox(
                placeholder="Paste your HuggingFace token (HF_TOKEN)",
                label="HF_TOKEN",
                type="password"
            )
            nebius_key_box = gr.Textbox(
                placeholder="Paste your Nebius API key (NEBIUS_API_KEY)",
                label="NEBIUS_API_KEY",
                type="password"
            )
            save_keys_btn = gr.Button("Save keys & initialize Atlas")
            setup_status = gr.Markdown("")

            gr.Markdown("---")
            gr.Markdown("### Speech module")
            
            mic = gr.Audio(
                sources=["microphone"],
                type="numpy",
                label="Microphone",
                streaming=True,
            )
            
            audio_out = gr.Audio(label="Response", autoplay=True, streaming=True)
            tts_toggle = gr.Checkbox(label="🔊 TTS Enabled", value=True)
            stop_btn = gr.Button("🛑 Stop", variant="stop")
            
            gr.Markdown("---")
            gr.Markdown("### 🖥️ Screen")
            capture_btn = gr.Button("📸 Capture Screen")
            screen_status = gr.Textbox(label="Status", value="Ready", interactive=False)

    
    # Stream -> detect pause -> stop
    mic.stream(
        process_audio,
        inputs=[mic, state],
        outputs=[mic, state],
        stream_every=0.5,
        time_limit=60,
    )
    
    # Stop -> transcribe -> respond -> restart
    mic.stop_recording(
        respond,
        inputs=[state, tts_toggle],
        outputs=[audio_out, state, chatbot],
    ).then(
        start_recording,
        inputs=[state],
        outputs=[mic],
    )
    
    stop_btn.click(
        lambda: (AppState(stopped=True), gr.Audio(recording=False)),
        outputs=[state, mic],
    )
    
    send_btn.click(send_text, inputs=[txt, state, tts_toggle], outputs=[chatbot, audio_out, state, txt])
    txt.submit(send_text, inputs=[txt, state, tts_toggle], outputs=[chatbot, audio_out, state, txt])
    
    # Screen capture
    capture_btn.click(
        capture_screen_handler,
        inputs=[state, tts_toggle],
        outputs=[chatbot, audio_out, state, screen_status]
    )

    # When app loads, show/hide token inputs based on env
    demo.load(
        fn=check_tokens_on_load,
        inputs=None,
        outputs=[hf_token_box, nebius_key_box, setup_status],
    )

    # When user clicks "Save keys"
    save_keys_btn.click(
        fn=save_tokens,
        inputs=[hf_token_box, nebius_key_box],
        outputs=[setup_status],
    )




if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",
        server_port=7860,
        theme=gr.themes.Default()
    )