const express = require('express');
const db = require('../db');
const { requireAuth } = require('../auth');
const { resolveActingProfile } = require('../lib/account');
const { loadPosts, loadCommentsForPost } = require('../lib/queries');
const { canPost } = require('../lib/permissions');
const { isAllowedExternalUrl } = require('../lib/media');

const router = express.Router();
router.use(requireAuth);

// Helfer: aktives Profil aufloesen (profileId aus body/query)
async function acting(req) {
    const profileId = (req.body && req.body.profileId) || req.query.profileId;
    return resolveActingProfile(req.account, profileId);
}

// GET /api/feed?type=home|advertising&profileId=
router.get('/feed', async (req, res) => {
    const { profile } = await acting(req);
    const type = req.query.type === 'advertising' ? 'advertising'
               : req.query.type === 'home' ? 'home' : null;
    const posts = await loadPosts(profile ? profile.id : 0, type);
    res.json({ posts });
});

// POST /api/posts  {profileId, feedType, body, mediaUrl}
router.post('/posts', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });

    const feedType = String(req.body.feedType || '').trim();
    const body = String(req.body.body || '').trim().slice(0, 2000);
    const mediaUrl = String(req.body.mediaUrl || '').trim().slice(0, 500);

    if (!body && !mediaUrl) return res.status(400).json({ error: 'empty_post' });
    if (feedType !== 'home' && feedType !== 'advertising') return res.status(400).json({ error: 'invalid_feed' });
    if (!canPost(profile.profile_type, feedType)) return res.status(403).json({ error: 'not_allowed_here' });

    let mediaId = null;
    if (mediaUrl) {
        const check = isAllowedExternalUrl(mediaUrl);
        if (!check.ok) return res.status(400).json({ error: 'media_rejected', reason: check.reason });
        mediaId = await db.insert(
            'INSERT INTO bleeter_media (owner_profile_id, source_type, url) VALUES (?, ?, ?)',
            [profile.id, 'external_url', mediaUrl]
        );
    }

    await db.insert(
        'INSERT INTO bleeter_posts (author_profile_id, feed_type, body, media_id) VALUES (?, ?, ?, ?)',
        [profile.id, feedType, body, mediaId]
    );
    res.json({ ok: true });
});

// DELETE /api/posts/:id  {profileId}
router.delete('/posts/:id', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });
    const postId = Number(req.params.id);
    const post = await db.q1('SELECT author_profile_id FROM bleeter_posts WHERE id = ? AND deleted_at IS NULL AND self_deleted_at IS NULL', [postId]);
    if (!post) return res.status(404).json({ error: 'not_found' });
    if (Number(post.author_profile_id) !== Number(profile.id)) return res.status(403).json({ error: 'not_owner' });
    await db.exec('UPDATE bleeter_posts SET self_deleted_at = NOW() WHERE id = ?', [postId]);
    res.json({ ok: true });
});

// POST /api/posts/:id/like  {profileId}  -> toggle
router.post('/posts/:id/like', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });
    await toggleLike(profile.id, 'post', Number(req.params.id));
    res.json({ ok: true });
});

// POST /api/posts/:id/comments  {profileId, body}
router.post('/posts/:id/comments', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });
    const postId = Number(req.params.id);
    const body = String(req.body.body || '').trim().slice(0, 500);
    if (!body) return res.status(400).json({ error: 'empty_comment' });
    const post = await db.q1('SELECT id FROM bleeter_posts WHERE id = ? AND deleted_at IS NULL AND self_deleted_at IS NULL AND hidden_at IS NULL', [postId]);
    if (!post) return res.status(404).json({ error: 'not_found' });
    await db.insert('INSERT INTO bleeter_comments (post_id, author_profile_id, body) VALUES (?, ?, ?)', [postId, profile.id, body]);
    const comments = await loadCommentsForPost(postId, profile.id);
    res.json({ ok: true, comments });
});

// DELETE /api/comments/:id  {profileId}
router.delete('/comments/:id', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });
    const commentId = Number(req.params.id);
    const c = await db.q1('SELECT author_profile_id, post_id FROM bleeter_comments WHERE id = ? AND deleted_at IS NULL AND self_deleted_at IS NULL', [commentId]);
    if (!c) return res.status(404).json({ error: 'not_found' });
    if (Number(c.author_profile_id) !== Number(profile.id)) return res.status(403).json({ error: 'not_owner' });
    await db.exec('UPDATE bleeter_comments SET self_deleted_at = NOW() WHERE id = ?', [commentId]);
    res.json({ ok: true });
});

// POST /api/comments/:id/like  {profileId}  -> toggle
router.post('/comments/:id/like', async (req, res) => {
    const { profile } = await acting(req);
    if (!profile) return res.status(400).json({ error: 'no_profile' });
    await toggleLike(profile.id, 'comment', Number(req.params.id));
    res.json({ ok: true });
});

async function toggleLike(profileId, targetType, targetId) {
    const existing = await db.q1(
        'SELECT id FROM bleeter_likes WHERE profile_id = ? AND target_type = ? AND target_id = ?',
        [profileId, targetType, targetId]
    );
    if (existing) {
        await db.exec('DELETE FROM bleeter_likes WHERE id = ?', [existing.id]);
    } else {
        await db.exec(
            'INSERT IGNORE INTO bleeter_likes (profile_id, target_type, target_id) VALUES (?, ?, ?)',
            [profileId, targetType, targetId]
        );
    }
}

module.exports = router;