from fastapi import APIRouter, HTTPException
from services.memory import (
    get_all_sessions,
    get_session,
    get_or_create_session,
    get_history,
    delete_session,
    update_session_title,
    update_session_persona,
    get_message_count,
    update_session_rpg,
    update_session_facts,
    update_session_global_plot,
    update_session_status_quo,
    update_session_genre,
    update_session_rpg_settings,
    get_quests,
    get_last_message_preview,
    fork_session,
)
from models.schemas import ForkSessionRequest, RebindPersonaRequest
from services.chat_prompt import get_system_prompt
from services.memory import rebind_session_persona
from services.personas import get_persona

router = APIRouter(prefix="/sessions", tags=["sessions"])


@router.get("/")
async def list_sessions():
    sessions = await get_all_sessions()
    result = []
    for s in sessions:
        count = await get_message_count(s["session_id"])
        preview = await get_last_message_preview(s["session_id"])
        result.append({**s, "message_count": count, "last_message_preview": preview})
    return result


@router.get("/{session_id}/quests")
async def list_quests(session_id: str):
    return await get_quests(session_id)


@router.get("/{session_id}")
async def get_session_route(session_id: str):
    s = await get_session(session_id)
    if not s:
        raise HTTPException(status_code=404, detail="Сессия не найдена")
    return s


@router.post("/{session_id}/rebind-persona")
async def rebind_persona(session_id: str, body: RebindPersonaRequest):
    session = await get_session(session_id)
    if not session:
        raise HTTPException(status_code=404, detail="Сессия не найдена")
    persona = await get_persona(body.persona_id)
    if not persona:
        raise HTTPException(status_code=400, detail="Персонаж не найден")

    hist = [] if body.clear_history else await get_history(session_id)
    static = await get_system_prompt(body.persona_id, hist, "")
    first_mes = (persona.get("first_mes") or "").strip() if body.clear_history else None

    try:
        await rebind_session_persona(
            session_id,
            body.persona_id,
            clear_history=body.clear_history,
            static_prompt=static,
            first_mes=first_mes or None,
        )
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))

    return {
        "persona_id": body.persona_id,
        "persona_name": persona.get("name", body.persona_id),
        "system_prompt_preview": static[:500],
        "clear_history": body.clear_history,
    }


@router.patch("/{session_id}")
async def patch_session(session_id: str, data: dict):
    create_pid = data.get("persona_id") if "persona_id" in data else None
    await get_or_create_session(session_id, create_pid)
    if "title" in data:
        await update_session_title(session_id, data["title"])
    if "persona_id" in data:
        await update_session_persona(session_id, data["persona_id"])
    if "rpg_enabled" in data:
        await update_session_rpg(session_id, bool(data["rpg_enabled"]))
    if "facts_json" in data:
        await update_session_facts(session_id, data["facts_json"])
    if "global_plot" in data:
        await update_session_global_plot(session_id, data["global_plot"])
    if "status_quo" in data:
        await update_session_status_quo(session_id, data["status_quo"])
    if "genre" in data:
        await update_session_genre(session_id, data["genre"])
    if "rpg_settings_json" in data:
        await update_session_rpg_settings(session_id, data["rpg_settings_json"])
    return {"status": "updated"}


@router.post("/{session_id}/fork")
async def fork_session_route(session_id: str, req: ForkSessionRequest):
    new_id = await fork_session(session_id, req.until_message_id)
    if not new_id:
        raise HTTPException(status_code=404, detail="Сессия не найдена")
    return {"session_id": new_id, "source_session_id": session_id}


@router.delete("/{session_id}")
async def remove_session(session_id: str):
    await delete_session(session_id)
    return {"status": "deleted", "session_id": session_id}