const express = require("express");
const Report = require("../models/Report");
const auth = require("../middleware/auth");
const { asyncHandler } = require("../middleware/errorHandler");
const {
  createReportValidation,
  reportIdValidation,
} = require("../middleware/validators/reportValidator");
const { upload, handleUploadError } = require("../middleware/upload");
const { uploadImage, deleteImage } = require("../config/cloudinary");

const router = express.Router();

// Get all reports (with pagination)
router.get(
  "/",
  asyncHandler(async (req, res) => {
    const { paginate, buildPaginatedResponse } = require("../middleware/pagination");

    // Parse pagination params
    const page = parseInt(req.query.page) || 1;
    const limit = Math.min(parseInt(req.query.limit) || 10, 100);
    const skip = (page - 1) * limit;

    const reports = await Report.find()
      .sort({ createdAt: -1 })
      .skip(skip)
      .limit(limit)
      .populate("street", ["name"])
      .populate("user", ["name", "profilePicture"]);

    const totalCount = await Report.countDocuments();

    res.json(buildPaginatedResponse(reports, totalCount, page, limit));
  }),
);

// Create a report with optional image
router.post(
  "/",
  auth,
  upload.single("image"),
  handleUploadError,
  createReportValidation,
  asyncHandler(async (req, res) => {
    const { street, issue } = req.body;

    const reportData = {
      street,
      user: req.user.id,
      issue,
    };

    // Upload image if provided
    if (req.file) {
      const result = await uploadImage(
        req.file.buffer,
        "adopt-a-street/reports",
      );
      reportData.imageUrl = result.url;
      reportData.cloudinaryPublicId = result.publicId;
    }

    const newReport = new Report(reportData);
    const report = await newReport.save();

    // Populate user and street data
    await report.populate([
      { path: "user", select: "name profilePicture" },
      { path: "street", select: "name" },
    ]);

    res.json(report);
  }),
);

// Add image to existing report
router.post(
  "/:id/image",
  auth,
  upload.single("image"),
  handleUploadError,
  reportIdValidation,
  asyncHandler(async (req, res) => {
    const report = await Report.findById(req.params.id);
    if (!report) {
      return res.status(404).json({ msg: "Report not found" });
    }

    // Verify user owns the report
    if (report.user.toString() !== req.user.id) {
      return res.status(403).json({ msg: "Not authorized" });
    }

    if (!req.file) {
      return res.status(400).json({ msg: "No image file provided" });
    }

    // Delete old image if exists
    if (report.cloudinaryPublicId) {
      await deleteImage(report.cloudinaryPublicId);
    }

    // Upload new image
    const result = await uploadImage(
      req.file.buffer,
      "adopt-a-street/reports",
    );

    report.imageUrl = result.url;
    report.cloudinaryPublicId = result.publicId;
    await report.save();

    res.json(report);
  }),
);

// Resolve a report
router.put(
  "/:id",
  auth,
  reportIdValidation,
  asyncHandler(async (req, res) => {
    const report = await Report.findById(req.params.id);
    if (!report) {
      return res.status(404).json({ msg: "Report not found" });
    }

    report.status = "resolved";

    await report.save();

    res.json(report);
  }),
);

module.exports = router;