const PoliciesPage = require("../models/policiesPage");
const AUDIT_ACTIONS = require("../constants/auditAction");
const {
  baseConfig: policiesConfig,
  createPoliciesSectionEditorConfig,
} = require("../utils/contentEditors/policiesConfig");
const createPageContentController = require("./_createPageContentController");
const createRenderSingletonPageView = require("./_renderSingletonPageView");
const writeAuditLog = require("../audit/writeAuditLog");
const diffObject = require("../audit/diffObject");
const jsonHelper = require("../utils/jsonHelper");

function formatLastUpdated(date = new Date()) {
  return `Last updated: ${new Intl.DateTimeFormat("en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
  }).format(date)}`;
}

function withLastUpdated(payload) {
  return {
    ...payload,
    hero: {
      ...(payload.hero || {}),
      lastUpdated: formatLastUpdated(),
    },
  };
}

const baseController = createPageContentController({
  model: PoliciesPage,
  modelName: "PoliciesPage",
  auditAction: AUDIT_ACTIONS.UPDATE_POLICIES,
  editorConfig: policiesConfig,
  preparePayload: withLastUpdated,
});

module.exports = {
  ...baseController,
  async index(req, res) {
    try {
      return await createRenderSingletonPageView({
        model: PoliciesPage,
        editorConfig: policiesConfig,
        view: "admin/policies/index",
      })(req, res);
    } catch (error) {
      console.error("policies index error:", error);
      req.flash("error_msg", "Error loading Policies Management");
      return req.session.save(() => res.redirect("/admin/dashboard"));
    }
  },

  async editSections(req, res) {
    try {
      const doc = await PoliciesPage.getSingle();
      const data = doc.toObject();
      const policy = (data.policies || []).find(
        (item) => item.id === req.params.policyId,
      );

      if (!policy) {
        req.flash("error_msg", "Policy not found");
        return req.session.save(() => res.redirect("/admin/policies"));
      }

      const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";
      const backendUrl =
        process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
      const editorConfig = createPoliciesSectionEditorConfig(
        policy,
        data.policies || [],
      );

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

  async updateSections(req, res) {
    try {
      const payload =
        typeof req.body.pageJson === "string"
          ? JSON.parse(req.body.pageJson)
          : req.body.pageJson || {};
      const doc = await PoliciesPage.getSingle();
      const beforeData = JSON.parse(JSON.stringify(doc.toObject()));
      const policyIndex = (doc.policies || []).findIndex(
        (item) => item.id === req.params.policyId,
      );

      if (policyIndex === -1) {
        req.flash("error_msg", "Policy not found");
        return req.session.save(() => res.redirect("/admin/policies"));
      }

      doc.policies[policyIndex].sections = Array.isArray(payload.sections)
        ? payload.sections
        : [];
      doc.hero = {
        ...(doc.hero || {}),
        lastUpdated: formatLastUpdated(),
      };
      doc.markModified("policies");
      doc.markModified("hero");
      await doc.save();

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

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

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

      req.flash("success_msg", "Policy sections updated successfully");
      return req.session.save(() =>
        res.redirect(`/admin/policies/${req.params.policyId}/section`),
      );
    } catch (error) {
      console.error("policies section update error:", error);
      req.flash("error_msg", `Error updating policy sections: ${error.message}`);
      return req.session.save(() =>
        res.redirect(`/admin/policies/${req.params.policyId}/section`),
      );
    }
  },
};