"""Project Knowledge Graph API."""

from __future__ import annotations

from pathlib import Path
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel, Field
from sqlalchemy.ext.asyncio import AsyncSession

from ..core.response import success_response
from ..database import get_db
from ..dependencies.auth import get_current_user
from ..dependencies.tenant import get_tenant_id
from ..models import User
from ..services.auth import has_any_role
from ..services.project_knowledge_graph import ProjectKnowledgeGraphService

router = APIRouter(prefix="/ai-steward/knowledge-graph", tags=["AI Steward"])


class StructuredSyncRequest(BaseModel):
    limit: int = Field(default=1000, ge=1, le=5000)


class CodeScanRequest(BaseModel):
    base_dir: Optional[str] = Field(default=None, max_length=400)


class FeishuDeltaEnqueueRequest(BaseModel):
    limit: int = Field(default=500, ge=1, le=2000)


class EventProcessRequest(BaseModel):
    max_batch: int = Field(default=200, ge=1, le=1000)
    max_retry: int = Field(default=3, ge=0, le=10)


class IncrementalCycleRequest(BaseModel):
    delta_limit: int = Field(default=1000, ge=1, le=5000)
    event_batch: int = Field(default=200, ge=1, le=1000)
    code_scan_hours: int = Field(default=6, ge=1, le=168)
    code_scan_base_dir: Optional[str] = Field(default=None, max_length=400)


def _require_manager(user: User) -> None:
    if not has_any_role(str(user.role or ""), ["BOSS", "ADMIN"]):
        raise HTTPException(status_code=403, detail="仅管理员可操作知识图谱同步")


@router.get("/overview")
async def get_kg_overview(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _ = current_user
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.get_overview()
    return success_response(data)


@router.get("/sync-runs")
async def list_sync_runs(
    limit: int = Query(default=50, ge=1, le=200),
    run_type: Optional[str] = Query(default=None, max_length=40),
    status: Optional[str] = Query(default=None, max_length=20),
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.list_sync_runs(
        limit=int(limit),
        run_type=run_type,
        status=status,
    )
    return success_response(data)


@router.get("/sync-slo")
async def get_sync_slo(
    lookback_hours: int = Query(default=24, ge=1, le=24 * 30),
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.get_sync_slo(lookback_hours=int(lookback_hours))
    return success_response(data)


@router.post("/sync/structured")
async def sync_structured(
    body: StructuredSyncRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.sync_structured_entities(limit=int(body.limit))
    return success_response(data)


@router.post("/sync/codebase")
async def sync_codebase(
    body: CodeScanRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))

    root = Path("/app/backend").resolve()
    requested = Path(body.base_dir).resolve() if body.base_dir else root
    # 仅允许扫描 backend 根目录或其子目录
    if root not in requested.parents and requested != root:
        raise HTTPException(status_code=400, detail="base_dir 仅允许 /app/backend 范围内路径")

    try:
        data = await service.sync_codebase_snapshot(base_dir=str(requested))
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return success_response(data)


@router.post("/sync/feishu")
async def enqueue_feishu_delta(
    body: FeishuDeltaEnqueueRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.enqueue_feishu_delta_events(limit=int(body.limit))
    return success_response(data)


@router.post("/events/process")
async def process_ingest_events(
    body: EventProcessRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))
    data = await service.process_pending_events(
        max_batch=int(body.max_batch),
        max_retry=int(body.max_retry),
    )
    return success_response(data)


@router.post("/sync/incremental")
async def run_incremental_cycle(
    body: IncrementalCycleRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _require_manager(current_user)
    service = ProjectKnowledgeGraphService(db, tenant_id=int(getattr(current_user, "tenant_id", tenant_id) or tenant_id))

    root = Path("/app/backend").resolve()
    requested = Path(body.code_scan_base_dir).resolve() if body.code_scan_base_dir else None
    if requested is not None and root not in requested.parents and requested != root:
        raise HTTPException(status_code=400, detail="code_scan_base_dir 仅允许 /app/backend 范围内路径")

    data = await service.run_incremental_cycle(
        delta_limit=int(body.delta_limit),
        event_batch=int(body.event_batch),
        code_scan_hours=int(body.code_scan_hours),
        code_scan_base_dir=str(requested) if requested else None,
        run_source="manual_api",
    )
    return success_response(data)