<?php
/**
 * Enhanced Comments API
 * 
 * POST /api/comments_enhanced.php?action=post - Post comment/reply
 * POST /api/comments_enhanced.php?action=react - Add reaction
 * POST /api/comments_enhanced.php?action=unreact - Remove reaction
 * POST /api/comments_enhanced.php?action=edit - Edit comment
 * POST /api/comments_enhanced.php?action=pin - Pin comment
 * GET /api/comments_enhanced.php?action=list&video_id=X - Get threaded comments
 * GET /api/comments_enhanced.php?action=replies&comment_id=X - Get replies
 */

require_once dirname(__DIR__) . '/f_core/config.boot.php';
require_once dirname(__DIR__) . '/f_core/f_classes/class.comments_enhanced.php';

header('Content-Type: application/json');

session_start();
$current_user_id = $_SESSION['user_id'] ?? null;
$comments = new VCommentsEnhanced();

$action = $_GET['action'] ?? $_POST['action'] ?? 'list';

switch ($action) {
    case 'list':
        $video_id = $_GET['video_id'] ?? null;
        $limit = intval($_GET['limit'] ?? 50);
        $offset = intval($_GET['offset'] ?? 0);
        $sort = $_GET['sort'] ?? 'top'; // top, newest, oldest
        
        if (!$video_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Video ID required']);
            exit;
        }
        
        $data = $comments->getThreadedComments($video_id, $limit, $offset, $sort);
        echo json_encode(['success' => true, 'comments' => $data]);
        break;
        
    case 'replies':
        $comment_id = $_GET['comment_id'] ?? null;
        $limit = intval($_GET['limit'] ?? 10);
        
        if (!$comment_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Comment ID required']);
            exit;
        }
        
        $data = $comments->getReplies($comment_id, $limit);
        echo json_encode(['success' => true, 'replies' => $data]);
        break;
        
    case 'post':
        if (!$current_user_id) {
            http_response_code(401);
            echo json_encode(['success' => false, 'error' => 'Authentication required']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $video_id = $input['video_id'] ?? null;
        $comment_text = $input['comment'] ?? null;
        $parent_comment_id = $input['parent_comment_id'] ?? null;
        
        if (!$video_id || !$comment_text) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Video ID and comment text required']);
            exit;
        }
        
        $comment_id = $comments->postComment($video_id, $current_user_id, $comment_text, $parent_comment_id);
        
        echo json_encode(['success' => true, 'comment_id' => $comment_id]);
        break;
        
    case 'react':
        if (!$current_user_id) {
            http_response_code(401);
            echo json_encode(['success' => false, 'error' => 'Authentication required']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $comment_id = $input['comment_id'] ?? null;
        $reaction_type = $input['reaction_type'] ?? 'like';
        
        if (!$comment_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Comment ID required']);
            exit;
        }
        
        $comments->addReaction($comment_id, $current_user_id, $reaction_type);
        
        echo json_encode(['success' => true]);
        break;
        
    case 'unreact':
        if (!$current_user_id) {
            http_response_code(401);
            echo json_encode(['success' => false, 'error' => 'Authentication required']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $comment_id = $input['comment_id'] ?? null;
        $reaction_type = $input['reaction_type'] ?? 'like';
        
        if (!$comment_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Comment ID required']);
            exit;
        }
        
        $comments->removeReaction($comment_id, $current_user_id, $reaction_type);
        
        echo json_encode(['success' => true]);
        break;
        
    case 'edit':
        if (!$current_user_id) {
            http_response_code(401);
            echo json_encode(['success' => false, 'error' => 'Authentication required']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $comment_id = $input['comment_id'] ?? null;
        $new_text = $input['comment'] ?? null;
        
        if (!$comment_id || !$new_text) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Comment ID and new text required']);
            exit;
        }
        
        $success = $comments->editComment($comment_id, $current_user_id, $new_text);
        
        if ($success) {
            echo json_encode(['success' => true]);
        } else {
            http_response_code(403);
            echo json_encode(['success' => false, 'error' => 'Permission denied']);
        }
        break;
        
    case 'pin':
        if (!$current_user_id) {
            http_response_code(401);
            echo json_encode(['success' => false, 'error' => 'Authentication required']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $comment_id = $input['comment_id'] ?? null;
        
        if (!$comment_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Comment ID required']);
            exit;
        }
        
        $success = $comments->pinComment($comment_id, $current_user_id);
        
        if ($success) {
            echo json_encode(['success' => true]);
        } else {
            http_response_code(403);
            echo json_encode(['success' => false, 'error' => 'Permission denied']);
        }
        break;
        
    default:
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Invalid action']);
}