const express = require("express");
const router = express.Router();
const { query } = require("../db");
const { v4: uuidv4 } = require("uuid");

// GET all profiles
router.get("/", async (req, res) => {
  try {
    const result = await query("SELECT * FROM profiles ORDER BY name ASC");
    res.json({ success: true, profiles: result.rows });
  } catch (err) {
    console.error("Error fetching profiles:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to fetch profiles" });
  }
});

// GET single profile by ID
router.get("/:id", async (req, res) => {
  try {
    const result = await query("SELECT * FROM profiles WHERE id = $1", [
      req.params.id,
    ]);

    if (result.rows.length === 0) {
      return res
        .status(404)
        .json({ success: false, message: "Profile not found" });
    }

    // Also get profile's songs with their preferred keys
    const songsResult = await query(
      `
      SELECT s.*, psk.song_key as preferred_key
      FROM songs s
      INNER JOIN profile_songs ps ON s.id = ps.song_id
      LEFT JOIN profile_song_keys psk ON ps.profile_id = psk.profile_id AND ps.song_id = psk.song_id
      WHERE ps.profile_id = $1
      ORDER BY s.title ASC
    `,
      [req.params.id],
    );

    res.json({
      success: true,
      profile: result.rows[0],
      songs: songsResult.rows,
    });
  } catch (err) {
    console.error("Error fetching profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to fetch profile" });
  }
});

// POST create new profile
router.post("/", async (req, res) => {
  try {
    const {
      first_name,
      last_name,
      name,
      email,
      contact_number,
      notes,
      default_key,
    } = req.body;

    const profileName = name || `${first_name || ""} ${last_name || ""}`.trim();
    if (!profileName) {
      return res
        .status(400)
        .json({ success: false, message: "Name is required" });
    }

    const id = uuidv4();

    const result = await query(
      `INSERT INTO profiles (id, first_name, last_name, name, email, contact_number, notes, default_key)
       VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
       RETURNING *`,
      [
        id,
        first_name || "",
        last_name || "",
        profileName,
        email || "",
        contact_number || "",
        notes || "",
        default_key || "C",
      ],
    );

    res.status(201).json({ success: true, profile: result.rows[0] });
  } catch (err) {
    console.error("Error creating profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to create profile" });
  }
});

// PUT update profile
router.put("/:id", async (req, res) => {
  try {
    const {
      first_name,
      last_name,
      name,
      email,
      contact_number,
      notes,
      default_key,
    } = req.body;

    const result = await query(
      `UPDATE profiles 
       SET first_name = COALESCE($1, first_name),
           last_name = COALESCE($2, last_name),
           name = COALESCE($3, name),
           email = COALESCE($4, email),
           contact_number = COALESCE($5, contact_number),
           notes = COALESCE($6, notes),
           default_key = COALESCE($7, default_key)
       WHERE id = $8
       RETURNING *`,
      [
        first_name,
        last_name,
        name,
        email,
        contact_number,
        notes,
        default_key,
        req.params.id,
      ],
    );

    if (result.rows.length === 0) {
      return res
        .status(404)
        .json({ success: false, message: "Profile not found" });
    }

    res.json({ success: true, profile: result.rows[0] });
  } catch (err) {
    console.error("Error updating profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to update profile" });
  }
});

// DELETE profile
router.delete("/:id", async (req, res) => {
  try {
    const result = await query(
      "DELETE FROM profiles WHERE id = $1 RETURNING id",
      [req.params.id],
    );

    if (result.rows.length === 0) {
      return res
        .status(404)
        .json({ success: false, message: "Profile not found" });
    }

    res.json({ success: true, message: "Profile deleted" });
  } catch (err) {
    console.error("Error deleting profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to delete profile" });
  }
});

// POST add song to profile
router.post("/:id/songs/:songId", async (req, res) => {
  try {
    const { id, songId } = req.params;
    const { song_key } = req.body;

    const psId = uuidv4();

    // Add song to profile
    await query(
      `INSERT INTO profile_songs (id, profile_id, song_id) 
       VALUES ($1, $2, $3) 
       ON CONFLICT (profile_id, song_id) DO NOTHING`,
      [psId, id, songId],
    );

    // If key provided, set it
    if (song_key) {
      const pskId = uuidv4();
      await query(
        `INSERT INTO profile_song_keys (id, profile_id, song_id, song_key) 
         VALUES ($1, $2, $3, $4)
         ON CONFLICT (profile_id, song_id) DO UPDATE SET song_key = $4`,
        [pskId, id, songId, song_key],
      );
    }

    res.json({ success: true, message: "Song added to profile" });
  } catch (err) {
    console.error("Error adding song to profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to add song to profile" });
  }
});

// DELETE remove song from profile
router.delete("/:id/songs/:songId", async (req, res) => {
  try {
    const { id, songId } = req.params;

    await query(
      "DELETE FROM profile_songs WHERE profile_id = $1 AND song_id = $2",
      [id, songId],
    );
    await query(
      "DELETE FROM profile_song_keys WHERE profile_id = $1 AND song_id = $2",
      [id, songId],
    );

    res.json({ success: true, message: "Song removed from profile" });
  } catch (err) {
    console.error("Error removing song from profile:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to remove song from profile" });
  }
});

// GET profile count
router.get("/stats/count", async (req, res) => {
  try {
    const result = await query("SELECT COUNT(*) as count FROM profiles");
    res.json({ success: true, count: parseInt(result.rows[0].count) });
  } catch (err) {
    console.error("Error counting profiles:", err);
    res
      .status(500)
      .json({ success: false, message: "Failed to count profiles" });
  }
});

module.exports = router;