const { addBaseUrlToImages } = require("../utils/imageHelper");
const jsonHelper = require("../utils/jsonHelper");
const writeAuditLog = require("../audit/writeAuditLog");
const diffObject = require("../audit/diffObject");

function createPageContentController({
  model,
  modelName,
  auditAction,
  editorConfig,
  normalizeForEditor,
  normalizeForApi,
  preparePayload,
}) {
  return {
    async index(req, res) {
      try {
        const doc = await model.getSingle();
        const rawData = doc.toObject();
        const data = normalizeForEditor ? normalizeForEditor(rawData, req) : rawData;
        const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";
        const backendUrl =
          process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;

        res.render("admin/pageContent/index", {
          layout: "layouts/main",
          title: editorConfig.title,
          subtitle: editorConfig.subtitle,
          data,
          editorConfig,
          activeTab: req.query.tab || editorConfig.tabs[0].key,
          frontendUrl,
          backendUrl,
          previewUrl: `${frontendUrl}${editorConfig.previewPath}`,
          currentPath: req.path,
          user: req.session.user,
        });
      } catch (error) {
        console.error(`${editorConfig.key} index error:`, error);
        req.flash("error_msg", `Error loading ${editorConfig.title}`);
        return req.session.save(() => res.redirect("/admin/dashboard"));
      }
    },

    async update(req, res) {
      try {
        const rawPayload =
          typeof req.body.pageJson === "string"
            ? JSON.parse(req.body.pageJson)
            : req.body.pageJson || {};

        const activeTab = req.body.activeTab || editorConfig.tabs[0].key;
        const doc = await model.getSingle();
        const beforeData = JSON.parse(JSON.stringify(doc.toObject()));
        const payload = preparePayload
          ? preparePayload(rawPayload, { req, doc, beforeData })
          : rawPayload;

        doc.set(payload);
        Object.keys(payload).forEach((key) => doc.markModified(key));
        await doc.save();

        const afterData = JSON.parse(JSON.stringify(doc.toObject()));
        const changes = diffObject(beforeData, afterData);

        if (changes.length > 0) {
          await writeAuditLog({
            model: modelName,
            documentId: doc._id,
            action: auditAction,
            before: beforeData,
            after: afterData,
            changes,
            req,
          });
        }

        // const finalData = await model
        //   .findOne()
        //   .select("-_id -__v -createdAt -updatedAt")
        //   .lean();
        // jsonHelper.writeJsonFile(editorConfig.dataFile, finalData);

        req.flash("success_msg", `${editorConfig.title} updated successfully`);
        return req.session.save(() =>
          res.redirect(`${editorConfig.routeBase}?tab=${activeTab}`),
        );
      } catch (error) {
        console.error(`${editorConfig.key} update error:`, error);
        req.flash(
          "error_msg",
          `Error updating ${editorConfig.title}: ${error.message}`,
        );
        return req.session.save(() =>
          res.redirect(
            `${editorConfig.routeBase}?tab=${req.body.activeTab || ""}`,
          ),
        );
      }
    },

    async api(req, res) {
      try {
        const doc = await model.getSingle();
        const rawData = doc.toObject();
        const backendUrl =
          process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
        const normalized = normalizeForApi ? normalizeForApi(rawData, req) : rawData;
        const processed = addBaseUrlToImages(normalized, backendUrl);
        return res.json(processed);
      } catch (error) {
        console.error(`${editorConfig.key} api error:`, error);
        return res
          .status(500)
          .json({ error: `Error loading ${editorConfig.key} data` });
      }
    },
  };
}

module.exports = createPageContentController;