const express = require("express");
const BibleVerse = require("../models/BibleVerse");

const router = express.Router();

const pickRandomVerse = async (filter) => {
  const results = await BibleVerse.aggregate([
    { $match: filter },
    { $sample: { size: 1 } },
  ]);
  return results[0] || null;
};

router.get("/today", async (req, res) => {
  try {
    const targetDate = req.query.date || new Date().toISOString().slice(0, 10);
    const datedVerse = await pickRandomVerse({
      active: true,
      date: targetDate,
    });
    if (datedVerse) {
      return res.json(datedVerse);
    }

    const undatedVerse = await pickRandomVerse({
      active: true,
      $or: [{ date: { $exists: false } }, { date: null }, { date: "" }],
    });
    if (undatedVerse) {
      return res.json(undatedVerse);
    }

    const anyVerse = await pickRandomVerse({ active: true });
    if (!anyVerse) {
      return res.status(404).json({ message: "No bible verses available" });
    }
    return res.json(anyVerse);
  } catch (error) {
    res.status(500).json({ message: "Failed to fetch bible verse" });
  }
});

router.get("/verses", async (req, res) => {
  try {
    const filter = {};
    if (req.query.active === "true") {
      filter.active = true;
    }
    const verses = await BibleVerse.find(filter).sort({
      date: -1,
      createdAt: -1,
    });
    res.json(verses);
  } catch (error) {
    res.status(500).json({ message: "Failed to fetch bible verses" });
  }
});

router.post("/verses", async (req, res) => {
  try {
    const verse = await BibleVerse.create(req.body);
    res.status(201).json(verse);
  } catch (error) {
    res.status(400).json({ message: "Failed to create bible verse" });
  }
});

router.put("/verses/:id", async (req, res) => {
  try {
    const verse = await BibleVerse.findByIdAndUpdate(req.params.id, req.body, {
      new: true,
    });
    if (!verse) {
      return res.status(404).json({ message: "Bible verse not found" });
    }
    res.json(verse);
  } catch (error) {
    res.status(400).json({ message: "Failed to update bible verse" });
  }
});

router.delete("/verses/:id", async (req, res) => {
  try {
    const verse = await BibleVerse.findByIdAndDelete(req.params.id);
    if (!verse) {
      return res.status(404).json({ message: "Bible verse not found" });
    }
    res.json({ ok: true });
  } catch (error) {
    res.status(400).json({ message: "Failed to delete bible verse" });
  }
});

module.exports = router;