#
# SPDX-FileCopyrightText: Hadad <hadad@linuxmail.org>
# SPDX-License-Identifier: Apache-2.0
#

import asyncio
import httpx
import json
import random
import uuid

from src.config import *
from src.cores.server import fetch_response_stream_async
from src.cores.session import ensure_stop_event, get_model_key

async def chat_with_model_async(history, user_input, model_display, sess, custom_prompt, deep_search):
    """
    Core async function to interact with AI model.
    Prepares message history, system instructions, and optionally integrates deep search results.
    Tries multiple backend hosts and keys with fallback.
    Yields streamed responses for UI updates.
    """
    ensure_stop_event(sess)
    sess.stop_event.clear()
    sess.cancel_token["cancelled"] = False
    if not LINUX_SERVER_PROVIDER_KEYS or not LINUX_SERVER_HOSTS:
        yield ("content", RESPONSES["RESPONSE_3"])  # No providers available
        return
    if not hasattr(sess, "session_id") or not sess.session_id:
        sess.session_id = str(uuid.uuid4())
    model_key = get_model_key(model_display, MODEL_MAPPING, DEFAULT_MODEL_KEY)
    cfg = MODEL_CONFIG.get(model_key, DEFAULT_CONFIG)
    msgs = []
    # If deep search enabled and using primary model, prepend deep search instructions and results
    if deep_search and model_display == MODEL_CHOICES[0]:
        msgs.append({"role": "system", "content": DEEP_SEARCH_INSTRUCTIONS})
        try:
            async with httpx.AsyncClient() as client:
                payload = {
                    "query": user_input,
                    "topic": "general",
                    "search_depth": "basic",
                    "chunks_per_source": 5,
                    "max_results": 5,
                    "time_range": None,
                    "days": 7,
                    "include_answer": True,
                    "include_raw_content": False,
                    "include_images": False,
                    "include_image_descriptions": False,
                    "include_domains": [],
                    "exclude_domains": []
                }
                r = await client.post(DEEP_SEARCH_PROVIDER_HOST, headers={"Authorization": f"Bearer {DEEP_SEARCH_PROVIDER_KEY}"}, json=payload)
                sr_json = r.json()
                msgs.append({"role": "system", "content": json.dumps(sr_json)})
        except Exception:
            # Fail silently if deep search fails
            pass
        msgs.append({"role": "system", "content": INTERNAL_AI_INSTRUCTIONS})
    elif model_display == MODEL_CHOICES[0]:
        # For primary model without deep search, use internal instructions
        msgs.append({"role": "system", "content": INTERNAL_AI_INSTRUCTIONS})
    else:
        # For other models, use default instructions
        msgs.append({"role": "system", "content": custom_prompt or SYSTEM_PROMPT_MAPPING.get(model_key, SYSTEM_PROMPT_DEFAULT)})
    # Append conversation history alternating user and assistant messages
    msgs.extend([{"role": "user", "content": u} for u, _ in history])
    msgs.extend([{"role": "assistant", "content": a} for _, a in history if a])
    # Append current user input
    msgs.append({"role": "user", "content": user_input})
    # Shuffle provider hosts and keys for load balancing and fallback
    candidates = [(h, k) for h in LINUX_SERVER_HOSTS for k in LINUX_SERVER_PROVIDER_KEYS]
    random.shuffle(candidates)
    # Try each host-key pair until a successful response is received
    for h, k in candidates:
        stream_gen = fetch_response_stream_async(h, k, model_key, msgs, cfg, sess.session_id, sess.stop_event, sess.cancel_token)
        got_responses = False
        async for chunk in stream_gen:
            if sess.stop_event.is_set() or sess.cancel_token["cancelled"]:
                return
            got_responses = True
            yield chunk
        if got_responses:
            return
    # If no response from any provider, yield fallback message
    yield ("content", RESPONSES["RESPONSE_2"])