import { NextRequest, NextResponse } from 'next/server';
import { Pool } from 'pg';

const pool = new Pool({
  connectionString: process.env.DATABASE_URL || 'postgresql://vixtix:vixtix_secret@localhost:5433/vixtix',
});

function serializeRow(row: Record<string, any>): Record<string, any> {
  const toCamel = (str: string) => str.replace(/_([a-z])/g, (_, c) => c.toUpperCase());
  const result: Record<string, any> = {};
  for (const [key, value] of Object.entries(row)) {
    const camelKey = toCamel(key);
    if (value instanceof Date && !isNaN(value.getTime())) {
      if (value.getUTCHours() === 0 && value.getUTCMinutes() === 0 && value.getUTCSeconds() === 0 && value.getUTCMilliseconds() === 0) {
        const year = value.getUTCFullYear();
        const month = String(value.getUTCMonth() + 1).padStart(2, '0');
        const day = String(value.getUTCDate()).padStart(2, '0');
        result[camelKey] = `${year}-${month}-${day}`;
      } else {
        result[camelKey] = value.toISOString();
      }
    } else {
      result[camelKey] = value;
    }
  }
  return result;
}

export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url);
  const projectId = searchParams.get('project');

  try {
    let whereClause = 'parent_task_id IS NULL';
    let params: any[] = [];
    let paramIndex = 1;

    if (projectId) {
      whereClause += ` AND project_id = $${paramIndex++}`;
      params.push(projectId);
    }

    const result = await pool.query(
      `SELECT t.*, p.color as project_color, p.name as project_name
       FROM tasks t
       LEFT JOIN projects p ON t.project_id = p.id
       WHERE ${whereClause}
       ORDER BY t.sort_order`,
      params
    );

    const rows = result.rows.map(serializeRow);
    const grouped = {
      todo: rows.filter((t: any) => t.status === 'todo'),
      in_progress: rows.filter((t: any) => t.status === 'in_progress'),
      done: rows.filter((t: any) => t.status === 'done'),
    };

    return NextResponse.json(grouped);
  } catch (error) {
    console.error('Error fetching kanban data:', error);
    return NextResponse.json({ error: 'Failed to fetch kanban data' }, { status: 500 });
  }
}