"""The chat turn: assemble the prompt (lyra.mind) then speak + persist.

`mind.assemble()` runs the society of parts (perceive → route → compose →
deliberate) and hands back a ready message list + the active mode; `chat` runs the
tool/generation loop (the "speak" part) and persists the exchange. Keeping speak
here (not in mind) is deliberate — it's tangled with streaming and tool dispatch.
"""
from __future__ import annotations

from lyra import config, llm, logbus, memory, mind, modes, summary
from lyra import tools as toolkit
from lyra.llm import Backend

MAX_TOOL_ROUNDS = 5  # cap tool-call iterations per turn
# Backends that support function-calling. The MI50's llama.cpp server only does
# tools when launched with --jinja; until it is, keep tools to cloud so MI50 chat
# doesn't 500 on the tools param. Add "mi50" here once that flag is set.
TOOL_BACKENDS = {"cloud"}


def _resolve_model(backend: Backend, model_override: str | None, cfg) -> str:
    """Live chat uses the stronger chat_model on cloud; local/mi50 use their own.
    The UI's cloud-model picker only applies on the cloud backend."""
    model = {"local": cfg.local_model, "cloud": cfg.chat_model, "mi50": cfg.mi50_model}.get(
        backend, backend
    )
    if model_override and backend == "cloud":
        model = model_override
    return model


def _maybe_switch_mode(session_id: str, tool_name: str) -> None:
    """Keep the chat framing aligned with the live data: opening a poker session
    auto-flips this chat into Poker mode (next turn gets the card + full live tools).
    Manual UI switching still overrides anytime."""
    if tool_name == "start_session":
        memory.set_session_mode(session_id, modes.CASH.key)
        logbus.log("info", "mode auto-switch", session=session_id, mode=modes.CASH.key)


def respond(session_id: str, user_msg: str, backend: Backend = "cloud",
            model_override: str | None = None) -> str:
    """Produce Lyra's reply to a single user message and persist the exchange."""
    cfg = config.load()
    model = _resolve_model(backend, model_override, cfg)
    logbus.log("info", "chat request", session=session_id, backend=backend,
               model=model, embed=cfg.embed_backend)

    turn = mind.assemble(session_id, user_msg, backend, model)
    messages = turn.messages

    # Tool loop (speak): offer her tools (scoped to the mode); run any she calls and
    # feed results back until she returns a text reply.
    tool_specs = toolkit.specs(turn.mode.tools) if backend in TOOL_BACKENDS else None
    ctx = {"session_id": session_id, "backend": backend}
    reply = ""
    for _ in range(MAX_TOOL_ROUNDS):
        assistant_msg, tool_calls = llm.chat_call(
            messages, backend=backend, model=model, tools=tool_specs
        )
        if not tool_calls:
            reply = assistant_msg.get("content") or ""
            break
        messages.append(assistant_msg)  # her tool-call request
        for tc in tool_calls:
            result = toolkit.dispatch(tc["name"], tc["arguments"], ctx)
            logbus.log("info", "tool call", session=session_id, tool=tc["name"], result=result[:80])
            messages.append({"role": "tool", "tool_call_id": tc["id"], "content": result})
            _maybe_switch_mode(session_id, tc["name"])
    if not reply:
        reply = "(I got tangled using my tools there — say that again?)"
    logbus.log("info", "reply", session=session_id, chars=len(reply))

    memory.remember(session_id, "user", user_msg)
    memory.remember(session_id, "assistant", reply)
    summary.maybe_summarize_async(session_id)  # compact once enough new turns pile up
    return reply


def respond_stream(session_id: str, user_msg: str, backend: Backend = "cloud",
                   model_override: str | None = None):
    """Streaming generator version of `respond`.

    Yields ("delta", text) as content streams in, ("tool", name) when a tool runs,
    and a final ("done", reply). Persists the exchange — same side effects as `respond`.
    """
    cfg = config.load()
    model = _resolve_model(backend, model_override, cfg)
    logbus.log("info", "chat request (stream)", session=session_id, backend=backend,
               model=model, embed=cfg.embed_backend)

    turn = mind.assemble(session_id, user_msg, backend, model)
    messages = turn.messages
    tool_specs = toolkit.specs(turn.mode.tools) if backend in TOOL_BACKENDS else None
    ctx = {"session_id": session_id, "backend": backend}
    parts: list[str] = []
    for _ in range(MAX_TOOL_ROUNDS):
        assistant_msg = None
        tool_calls = None
        for ev, payload in llm.chat_call_stream(
            messages, backend=backend, model=model, tools=tool_specs
        ):
            if ev == "delta":
                parts.append(payload)
                yield ("delta", payload)
            elif ev == "message":
                assistant_msg = payload
            elif ev == "tool_calls":
                tool_calls = payload
        if not tool_calls:
            break
        messages.append(assistant_msg)  # her tool-call request
        for tc in tool_calls:
            result = toolkit.dispatch(tc["name"], tc["arguments"], ctx)
            logbus.log("info", "tool call", session=session_id, tool=tc["name"], result=result[:80])
            messages.append({"role": "tool", "tool_call_id": tc["id"], "content": result})
            _maybe_switch_mode(session_id, tc["name"])
            yield ("tool", tc["name"])

    reply = "".join(parts)
    if not reply:
        reply = "(I got tangled using my tools there — say that again?)"
        yield ("delta", reply)
    logbus.log("info", "reply", session=session_id, chars=len(reply))

    memory.remember(session_id, "user", user_msg)
    memory.remember(session_id, "assistant", reply)
    summary.maybe_summarize_async(session_id)
    yield ("done", reply)