"""
场景模板 API（独立路由，避免与 /api/v1/agents/{agent_id} 在部分部署中的匹配顺序问题）。
"""
from fastapi import APIRouter, Depends, status
from sqlalchemy.orm import Session
from typing import List
import logging

from app.core.database import get_db
from app.api.auth import get_current_user
from app.models.user import User
from app.models.agent import Agent
from app.core.exceptions import ValidationError, ConflictError
from app.services.workflow_validator import validate_workflow
from app.services.scene_templates import build_workflow_for_template, list_scene_template_meta
from app.api.agents import AgentResponse, SceneTemplateItem, AgentFromSceneTemplateCreate

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/v1/platform", tags=["platform-templates"])


@router.get("/scene-templates", response_model=List[SceneTemplateItem])
async def list_scene_templates_v1(current_user: User = Depends(get_current_user)):
    _ = current_user
    return list_scene_template_meta()


@router.post("/agents/from-template", response_model=AgentResponse, status_code=status.HTTP_201_CREATED)
async def create_agent_from_template_v1(
    body: AgentFromSceneTemplateCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    try:
        workflow_config = build_workflow_for_template(
            body.template_id, body.parameters or {}
        )
    except ValueError as e:
        raise ValidationError(str(e))

    validation_result = validate_workflow(
        workflow_config.get("nodes", []), workflow_config.get("edges", [])
    )
    if not validation_result["valid"]:
        raise ValidationError(
            "工作流配置验证失败: " + ", ".join(validation_result["errors"])
        )

    existing_agent = db.query(Agent).filter(
        Agent.name == body.name,
        Agent.user_id == current_user.id,
    ).first()
    if existing_agent:
        raise ConflictError(f"Agent名称 '{body.name}' 已存在")

    desc = body.description or f"自场景模板 {body.template_id} 创建"
    agent = Agent(
        name=body.name,
        description=desc,
        workflow_config=workflow_config,
        budget_config=body.budget_config,
        user_id=current_user.id,
        status="draft",
    )
    db.add(agent)
    db.commit()
    db.refresh(agent)
    logger.info(
        f"用户 {current_user.username} 从模板 {body.template_id} 创建 Agent: {agent.name} ({agent.id})"
    )
    return agent