"""FastAPI route definitions for Bridge V1.2 with UTF-8 support."""
from __future__ import annotations

import sys
from pathlib import Path

from fastapi import APIRouter, HTTPException, Request

import adapters as adapter_registry
from core.run_manager import RunManager
from models.schemas import CreateRunRequest, HealthResponse, RunResponse, RunStatus
from policy.guard import check as policy_check

def safe_print(text):
    """Print with UTF-8 encoding fallback for Windows CP1252."""
    try:
        print(text)
    except UnicodeEncodeError:
        sys.stdout.buffer.write(text.encode('utf-8', errors='replace'))
        sys.stdout.buffer.write(b'\n')

RUNS_DIR = Path(__file__).resolve().parents[1] / "runs"
_manager = RunManager(RUNS_DIR)

router = APIRouter()

@router.get("/health", response_model=HealthResponse)
def health():
    """Returns server status and per-adapter mode (real/stub)."""
    import os
    from adapters import openai_adapter
    from controller.decision_model import DECISION_MODE
    
    print(f"[ENCODING DEBUG] sys.getdefaultencoding() = {sys.getdefaultencoding()}")
    print(f"[ENCODING DEBUG] sys.getfilesystemencoding() = {sys.getfilesystemencoding()}")
    print(f"[ENCODING DEBUG] LANG = {os.environ.get('LANG', 'NOT SET')}")
    print(f"[ENCODING DEBUG] PYTHONIOENCODING = {os.environ.get('PYTHONIOENCODING', 'NOT SET')}")
    
    return HealthResponse(
        status="ok",
        adapters=adapter_registry.available(),
        openai_mode=openai_adapter.mode(),
        decision_backend=DECISION_MODE,
        ollama_model=os.environ.get("OLLAMA_MODEL", "qwen2.5:7b"),
    )


@router.post("/runs", response_model=RunResponse, status_code=201)
def create_run(body: CreateRunRequest):
    """One-shot run: create -> instruct -> execute -> persist -> done|forced.
    
    The response is the final completed state — status is never 'running'
    when this endpoint returns.
    
    FORCE AGENT ROUTING: All requests are forced to use 'agent' adapter.
    No fallback, no alternative adapters, no direct LLM calls.
    """
    safe_print("=== RUNS ENDPOINT CALLED ===")
    safe_print("=== FORCE AGENT ROUTING ENABLED ===")
    
    # Force agent adapter - ignore request body adapter
    forced_adapter = "agent"
    safe_print(f"=== USING ADAPTER: {forced_adapter} ===")
    
    # Handle greetings directly - no need to run agent
    goal_lower = body.goal.strip().lower()
    greetings = {
        "привет": "Привет! Я Agent Maxim. Напиши, что хочешь найти - я помогу!",
        "hi": "Hi! I'm Agent Maxim. What would you like to find?",
        "hello": "Hello! I'm Agent Maxim. What would you like to find?",
        "здравствуй": "Здравствуй! Я Agent Maxim. Напиши, что хочешь найти - я помогу!",
        "приветик": "Приветик! Чем могу помочь?",
        "йо": "Йо! Чем могу помочь?",
        "прив": "Прив! Что ищем?",
        "здорово": "Здорово! Чем могу помочь?",
        "йоу": "Йоу! Что хочешь найти?",
    }
    
    if goal_lower in greetings:
        from datetime import datetime, timezone
        now = datetime.now(timezone.utc).isoformat()
        safe_print(f"=== GREETING DETECTED: {goal_lower} - returning quick response ===")
        return RunResponse(
            run_id=body.run_id or "greeting",
            goal=body.goal,
            status="done",
            adapter=forced_adapter,
            adapter_mode="greeting",
            instruction=body.goal,
            response=greetings[goal_lower],
            error=None,
            exit_code=0,
            created_at=now,
            updated_at=now,
        )
    
    # DEBUG: Log encoding details
    safe_print(f"[ENCODING DEBUG] Raw goal: {body.goal}")
    safe_print(f"[ENCODING DEBUG] Repr goal: {repr(body.goal)}")
    safe_print(f"[ENCODING DEBUG] Goal type: {type(body.goal)}")
    safe_print(f"[ENCODING DEBUG] Goal bytes: {body.goal.encode('utf-8')}")
    
    # DEBUG: Log adapter info
    safe_print(f"[FORCE ROUTING] Requested adapter: {body.adapter}")
    safe_print(f"[FORCE ROUTING] Forced adapter: {forced_adapter}")
    safe_print(f"[FORCE ROUTING] No fallback, no alternatives - agent only")
    
    adapter_mod = adapter_registry.get(forced_adapter)
    if adapter_mod is None:
        safe_print("=== RETURNING RESPONSE (ERROR) ===")
        raise HTTPException(
            status_code=500,
            detail=f"Agent adapter not available - this should never happen",
        )

    try:
        state = _manager.execute_run(
            goal=body.goal,
            adapter_name=forced_adapter,
            adapter_fn=adapter_mod.execute,  # type: ignore[attr-defined]
            guard_fn=policy_check,
            run_id=body.run_id,
        )
    except ValueError as exc:
        safe_print("=== RETURNING RESPONSE (ERROR) ===")
        raise HTTPException(status_code=409, detail=str(exc)) from exc

    safe_print("=== RETURNING RESPONSE (SUCCESS) ===")
    return RunResponse(**state)


@router.get("/runs/{run_id}", response_model=RunResponse)
def get_run(run_id: str):
    """Retrieve persisted run state."""
    state = _manager.get_run(run_id)
    if state is None:
        raise HTTPException(status_code=404, detail=f"run '{run_id}' not found")
    return RunResponse(**state)


@router.post("/runs/{run_id}/cancel")
def cancel_run(run_id: str):
    """Cancel a running or pending run."""
    state = _manager.get_run(run_id)
    if state is None:
        raise HTTPException(status_code=404, detail=f"run '{run_id}' not found")
    
    _manager.cancel_run(run_id)
    return {"message": f"run '{run_id}' cancellation requested"}