import crypto from "node:crypto";
import { extractRubricFromImage } from "../services/aiService.js";
import { findRubricByImageHash, saveRubric } from "../services/rubricService.js";

export const uploadRubric = async (req, res) => {
  try {
    if (!req.file) {
      return res.status(400).json({ error: "No file uploaded" });
    }

    const imageHash = crypto.createHash("sha256").update(req.file.buffer).digest("hex");
    const cached = await findRubricByImageHash(imageHash);
    if (cached) {
      return res.json({
        ...cached,
        cached: true
      });
    }

    const extracted = await extractRubricFromImage(req.file);
    if (!extracted?.isValidRubric || !Array.isArray(extracted.rubric) || extracted.rubric.length === 0) {
      return res.status(400).json({ error: "rubric is invalid" });
    }

    const rubric = extracted.rubric;
    const saved = await saveRubric({
      rubric,
      imageHash,
      ownerUid: req.user?.uid || null
    });

    res.json({
      ...saved,
      cached: false
    });

  } catch (err) {
    res.status(500).json({
      error: "Failed to process rubric",
      message: err.message
    });
  }
};