"""导入主流程：下载 → 解析 → 清洗 → 切片 → embedding → Qdrant → AI 候选"""

import os
import uuid
from parser import download_file, parse_document
from chunker import chunk_document
from embedder import embed_batch
from indexer import upsert_points
from candidate_generator import generate_candidates
from api_client import (
    heartbeat as send_heartbeat,
    update_job_status,
    save_chunks,
    save_candidates,
    get_job_detail,
)


async def run_import(job: dict):
    """执行完整的文档导入流程"""
    job_id = job["id"]
    source_id = job.get("sourceId") or job.get("source_id")
    user_id = job["userId"] or job.get("user_id")
    kb_id = job["knowledgeBaseId"] or job.get("knowledge_base_id")
    file_id = job.get("fileId") or job.get("file_id")

    if not source_id:
        raise ValueError(f"任务 {job_id} 缺少 sourceId")

    # 获取 source 详情（从 NestJS）
    detail = await get_job_detail(job_id)
    source = (detail or {}).get("source", {}) if detail else {}
    mime_type = source.get("mimeType") or source.get("mime_type") or "text/plain"
    original_filename = source.get("originalFilename") or source.get("original_filename") or "unknown"

    tmp_dir = f"/data/tmp/imports/{job_id}"
    file_path = os.path.join(tmp_dir, original_filename)

    try:
        # 1. 下载文件
        await update_job_status(job_id, "DOWNLOADING", {"progress": 5})
        file_url = source.get("downloadUrl") or (detail or {}).get("downloadUrl", "")
        if file_url:
            await download_file(file_url, file_path)

        # 2. 解析
        await update_job_status(job_id, "PARSING", {"progress": 20})
        text = await parse_document(file_path, mime_type)

        # 如果文件不在本地（纯文本导入），直接从 source/import 中取文本
        if not text and (job.get("rawText") or source.get("rawText")):
            text = job.get("rawText", "") or source.get("rawText", "")

        if not text or len(text.strip()) < 10:
            raise ValueError("文档解析后内容过少，可能为空白或损坏文件")

        # 3. 清洗
        await update_job_status(job_id, "CLEANING", {"progress": 40, "textLength": len(text)})

        # 4. 切片
        await update_job_status(job_id, "CHUNKING", {"progress": 50})
        source_type = source.get("type") or "text"
        chunks = chunk_document(text, source_type)

        # 5. Embedding
        await update_job_status(job_id, "EMBEDDING", {"progress": 60})
        texts = [c["content"] for c in chunks]
        vectors = await embed_batch(texts)

        # 6. Qdrant 索引
        await update_job_status(job_id, "INDEXING", {"progress": 80})
        points = []
        chunk_records = []
        for i, (chunk, vec) in enumerate(zip(chunks, vectors)):
            chunk_id = f"chunk_{source_id}_{i}"
            points.append({
                "id": chunk_id,
                "vector": vec,
                "payload": {
                    "userId": user_id,
                    "knowledgeBaseId": kb_id,
                    "sourceId": source_id,
                    "chunkId": chunk_id,
                    "pageNumber": chunk.get("pageNumber"),
                    "sectionTitle": chunk.get("sectionTitle", ""),
                    "deleted": False,
                },
            })
            chunk_records.append({
                "userId": user_id,
                "knowledgeBaseId": kb_id,
                "sourceId": source_id,
                "content": chunk["content"],
                "chunkIndex": chunk["chunkIndex"],
                "pageNumber": chunk.get("pageNumber"),
                "sectionTitle": chunk.get("sectionTitle", ""),
                "tokenCount": len(chunk["content"]),
                "externalVectorId": chunk_id,
                "embeddingModel": "bge-m3",
                "embeddingStatus": "COMPLETED",
                "metadataJson": {"chunkType": chunk.get("chunkType", "text")},
            })

        await upsert_points(points)
        await save_chunks(chunk_records)

        # 7. 生成候选知识点
        await update_job_status(job_id, "GENERATING_CANDIDATES", {"progress": 90})
        candidates = await generate_candidates(text)
        if candidates:
            await save_candidates(user_id, kb_id, source_id, job_id, candidates)

        # 8. 完成
        await update_job_status(job_id, "COMPLETED", {"progress": 100})

    except Exception as e:
        await update_job_status(job_id, "FAILED_RETRYABLE", {
            "errorCode": "WORKER_ERROR",
            "errorMessage": str(e)[:500],
        })
        raise

    finally:
        # 清理临时文件
        if os.path.exists(tmp_dir):
            import shutil
            shutil.rmtree(tmp_dir, ignore_errors=True)