"""Define API routes for compliance."""

from __future__ import annotations

import asyncio
import json
from pathlib import Path
from typing import AsyncGenerator

from fastapi import APIRouter, File, UploadFile
from fastapi.responses import StreamingResponse

from app.schemas.compliance import (
    AnalyzeResponse,
    ComplianceChatRequest,
)
from app.services.mock_data import (
    generate_task_id,
    get_mock_compliance_result,
    get_mock_compliance_chat_response,
)
# Keep route handlers close to their transport-layer wiring for easier auditing.


router = APIRouter(prefix="/compliance", tags=["合规分析"])

# Keep route handlers close to their transport-layer wiring for easier auditing.
tasks_store: dict[str, dict] = {}

# Store uploaded compliance files inside the local backend data directory.
RAW_DATA_DIR = Path(__file__).resolve().parents[3] / "data" / "raw"


@router.post("/analyze", response_model=AnalyzeResponse)
async def analyze_document(file: UploadFile = File(...)):
    """Handle analyze document."""
    # Keep route handlers close to their transport-layer wiring for easier auditing.
    task_id = generate_task_id()

    # Keep route handlers close to their transport-layer wiring for easier auditing.
    RAW_DATA_DIR.mkdir(parents=True, exist_ok=True)
    file_path = RAW_DATA_DIR / f"compliance_{task_id}_{file.filename}"

    content = await file.read()
    with file_path.open("wb") as f:
        f.write(content)

    # Keep route handlers close to their transport-layer wiring for easier auditing.
    tasks_store[task_id] = {
        "task_id": task_id,
        "file_path": str(file_path),
        "status": "processing",
        "result": None,
    }

    # Keep route handlers close to their transport-layer wiring for easier auditing.
    # Keep route handlers close to their transport-layer wiring for easier auditing.
    tasks_store[task_id]["status"] = "completed"
    tasks_store[task_id]["result"] = get_mock_compliance_result(task_id)

    return AnalyzeResponse(task_id=task_id)


@router.get("/result/{task_id}")
async def get_result(task_id: str):
    """Return result."""
    if task_id not in tasks_store:
        # Keep route handlers close to their transport-layer wiring for easier auditing.
        return get_mock_compliance_result(task_id)

    task = tasks_store[task_id]

    if task["status"] == "processing":
        return {"status": "processing", "message": "分析进行中"}

    return task["result"]


@router.post("/chat/{segment_id}")
async def compliance_chat(segment_id: int, request: ComplianceChatRequest):
    """Handle compliance chat."""
    # Keep route handlers close to their transport-layer wiring for easier auditing.
    intent_map = {
        1: "车身结构设计",
        2: "动力系统配置",
        3: "安全配置设计",
    }
    intent = intent_map.get(segment_id, "车身结构设计")

    async def generate() -> AsyncGenerator[str, None]:
        # Keep route handlers close to their transport-layer wiring for easier auditing.
        """Handle generate."""
        response = get_mock_compliance_chat_response(intent, request.query)

        # Keep route handlers close to their transport-layer wiring for easier auditing.
        sentences = response.split("\n\n")
        for sentence in sentences:
            if sentence.strip():
                chunks = sentence.split("\n")
                for chunk in chunks:
                    if chunk.strip():
                        await asyncio.sleep(0.05)
                        yield (
                            "event: message\n"
                            f"data: {json.dumps({'type': 'chunk', 'text': chunk + chr(10)}, ensure_ascii=False)}\n\n"
                        )

        yield f"event: message\ndata: {json.dumps({'type': 'done'}, ensure_ascii=False)}\n\n"

    return StreamingResponse(
        generate(),
        media_type="text/event-stream",
        headers={"Cache-Control": "no-cache", "Connection": "keep-alive", "X-Accel-Buffering": "no"},
    )