from pathlib import Path

from fastapi import APIRouter, Depends, Query
from fastapi.responses import FileResponse
from sqlalchemy.orm import Session

from app.core.response import ApiResponse, ok
from app.core.user_context import UserContext, get_user_context
from app.db.session import get_db
from app.schemas.evaluation import EvaluationDetailResponse, EvaluationListResponse, ExportPdfResponse
from app.services.evaluation_service import EvaluationService
from app.services.pdf_export_service import PdfExportService

router = APIRouter()


@router.get("", response_model=ApiResponse[EvaluationListResponse])
def list_evaluations(
    page: int = Query(default=1, ge=1, description="页码，从 1 开始"),
    page_size: int = Query(default=10, ge=1, le=100, description="每页数量，最大 100"),
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """历史评价：基于 user_id 查询完整训练后的评价记录。"""
    return ok(EvaluationService(db).list_history(ctx.user_id, page=page, page_size=page_size))


@router.get("/{evaluation_id}", response_model=ApiResponse[EvaluationDetailResponse])
def get_evaluation_detail(
    evaluation_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """评价详情：校验 user_id 后返回完整评价报告。"""
    return ok(EvaluationService(db).get_detail(evaluation_id, ctx.user_id))


@router.post("/{evaluation_id}/export-pdf", response_model=ApiResponse[ExportPdfResponse])
def export_pdf(
    evaluation_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """PDF 导出：生成评价报告 PDF 并保存导出记录。"""
    export = PdfExportService(db).export(evaluation_id, ctx.user_id)
    db.commit()
    return ok(ExportPdfResponse(export_id=export.id, file_path=export.file_path))


@router.get("/{evaluation_id}/download-pdf", response_class=FileResponse)
def download_pdf(
    evaluation_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """PDF 下载：校验评价归属后生成报告，并以文件流方式触发浏览器下载。"""
    export = PdfExportService(db).export(evaluation_id, ctx.user_id)
    db.commit()
    file_path = Path(export.file_path)
    return FileResponse(
        path=file_path,
        media_type="application/pdf",
        filename=file_path.name,
    )