import { pool } from '../db.js';
import { displayName, hourlyRate } from './projects.js';
import { userFilter } from './access.js';

/*
 * Buchungen fuer Auswertungen laden - mit allem, was Dashboard, Reports,
 * Kundenansicht und Exporte brauchen, und mit dem Betrag je Buchung:
 *
 *   amount        abrechenbarer Betrag (Stunden x Stundensatz des Topfs);
 *                 nur fuer Projekte vom Typ "billable"
 *   fixed_amount  Festpreisprojekte: Stunden x virtueller Stundensatz
 *                 (Topfbudget / alle auf dem Topf gebuchten Stunden). Nur
 *                 intern, in Reports per Schalter zuschaltbar.
 */
export async function loadEntries(settings, { from, to, userIds = null, customerId, projectId, taskId, skipNonBillableProjects = false } = {}) {
  // Administratoren sind keine Mitarbeiter - ihre Zeiten zaehlen nirgends mit.
  const where = ["u.role <> 'admin'"];
  const params = [];
  if (from) {
    where.push('e.entry_date >= ?');
    params.push(from);
  }
  if (to) {
    where.push('e.entry_date <= ?');
    params.push(to);
  }
  const users = userFilter(userIds);
  where.push(users.sql);
  params.push(...users.params);
  if (customerId) {
    where.push('p.customer_id = ?');
    params.push(Number(customerId));
  }
  if (projectId) {
    where.push('e.project_id = ?');
    params.push(Number(projectId));
  }
  if (taskId) {
    where.push('e.task_id = ?');
    params.push(Number(taskId));
  }
  // Fuer Auswertungen, die nur das Kundengeschaeft zeigen sollen: interne
  // Projekte und Abwesenheiten bleiben draussen.
  if (skipNonBillableProjects) where.push("p.type <> 'non_billable'");

  const [rows] = await pool.query(
    `SELECT e.id, e.user_id, e.project_id, e.task_id, e.pot_id, e.entry_date, e.minutes, e.note, e.billable,
            e.created_at, e.updated_at,
            u.name AS user_name, u.color AS user_color, u.avatar AS user_avatar, u.is_external, u.company AS user_company, u.weekly_hours,
            u.manager_id,
            p.name AS project_name, p.code AS project_code, p.type AS project_type, p.billing_unit,
            p.rate AS project_rate,
            c.id AS customer_id, c.name AS customer_name, c.short_name AS customer_short, c.color AS customer_color,
            t.name AS task_name, t.rate AS task_rate,
            b.label AS pot_label, b.rate AS pot_rate, b.budget_amount AS pot_amount,
            b.order_number AS pot_order_number
       FROM pulse_time_entries e
       JOIN pulse_users u ON u.id = e.user_id
       JOIN pulse_projects p ON p.id = e.project_id
       JOIN pulse_customers c ON c.id = p.customer_id
       LEFT JOIN pulse_tasks t ON t.id = e.task_id
       LEFT JOIN pulse_budget_pots b ON b.id = e.pot_id
      WHERE ${where.join(' AND ')}
      ORDER BY e.entry_date, e.id`,
    params
  );

  // Virtueller Stundensatz braucht die Stunden des ganzen Topfs, nicht nur des Zeitraums.
  const fixedPots = [...new Set(rows.filter((r) => r.project_type === 'fixed' && r.pot_id).map((r) => r.pot_id))];
  const potMinutes = new Map();
  if (fixedPots.length) {
    const [usage] = await pool.query(
      `SELECT pot_id, SUM(minutes) AS minutes FROM pulse_time_entries WHERE pot_id IN (${fixedPots.map(() => '?').join(',')}) GROUP BY pot_id`,
      fixedPots
    );
    for (const u of usage) potMinutes.set(u.pot_id, Number(u.minutes));
  }

  return rows.map((r) => {
    const project = { name: r.project_name, code: r.project_code, billing_unit: r.billing_unit, type: r.project_type, rate: r.project_rate };
    const hours = r.minutes / 60;
    let amount = 0;
    let fixedAmount = 0;
    // Billable rechnet ueber den Satz des Topfs ab, Abruf ueber den am Projekt.
    // Traegt der Task einen eigenen Satz (z. B. "vor Ort"), gewinnt dieser.
    if (r.billable && (r.project_type === 'billable' || r.project_type === 'abruf')) {
      const rate = hourlyRate(
        r.project_type === 'abruf' ? null : { rate: r.pot_rate },
        project,
        settings,
        r.task_rate == null ? null : { rate: r.task_rate }
      );
      amount = rate ? hours * rate : 0;
    }
    if (r.billable && r.project_type === 'fixed' && r.pot_amount && potMinutes.get(r.pot_id)) {
      fixedAmount = (Number(r.pot_amount) / (potMinutes.get(r.pot_id) / 60)) * hours;
    }
    return {
      ...r,
      billable: Boolean(r.billable),
      is_external: Boolean(r.is_external),
      project_display: displayName(settings, project, { name: r.customer_name, short_name: r.customer_short }),
      amount: Math.round(amount * 100) / 100,
      fixed_amount: Math.round(fixedAmount * 100) / 100,
    };
  });
}