<?php

require_once __DIR__ . '/auth_check.php';

mnt_require_permission('maintenance.manage');

try {
    $pdo = mnt_pdo();

    $id              = (int)($_POST['id'] ?? 0);
    $equipmentId     = (int)($_POST['equipment_id'] ?? 0);
    $code            = trim((string)($_POST['code'] ?? ''));
    $title           = trim((string)($_POST['title'] ?? ''));
    $description     = trim((string)($_POST['description'] ?? ''));
    $interventionType = (string)($_POST['intervention_type'] ?? 'scheduled');
    $executionType   = (string)($_POST['execution_type'] ?? 'internal');
    $isCritical      = !empty($_POST['is_critical']) ? 1 : 0;
    $frequencyUnit   = (string)($_POST['frequency_unit'] ?? 'month');
    $frequencyValue  = (int)($_POST['frequency_value'] ?? 0);
    $frequencyNote   = trim((string)($_POST['frequency_note'] ?? ''));
    $alertDays       = (int)($_POST['alert_days'] ?? 7);
    $assigneeId      = (int)($_POST['assignee_employee_id'] ?? 0);
    $supervisorId    = (int)($_POST['supervisor_employee_id'] ?? 0);
    $supplierId      = (int)($_POST['supplier_id'] ?? 0);
    $isActive        = isset($_POST['is_active']) ? (int)!empty($_POST['is_active']) : 1;
    $notes           = trim((string)($_POST['notes'] ?? ''));

    if ($title === '') {
        mnt_json_fail('Il titolo è obbligatorio.');
    }
    if (!array_key_exists($interventionType, mnt_intervention_types())) {
        mnt_json_fail('Tipo di intervento non valido.');
    }
    if (!array_key_exists($executionType, mnt_execution_types())) {
        mnt_json_fail('Tipo di esecuzione non valido.');
    }
    if (!array_key_exists($frequencyUnit, mnt_frequency_units())) {
        mnt_json_fail('Unità di frequenza non valida.');
    }
    if ($frequencyUnit !== 'on_demand' && $frequencyValue <= 0) {
        mnt_json_fail('Indica ogni quanto va eseguita la manutenzione, oppure scegli "Al bisogno".');
    }
    if ($executionType === 'external' && $supplierId <= 0) {
        mnt_json_fail('Per una manutenzione esterna indica il fornitore.');
    }

    if ($frequencyUnit === 'on_demand') {
        $frequencyValue = null;
    }

    $values = [
        'code'                   => $code ?: null,
        'title'                  => $title,
        'description'            => $description ?: null,
        'intervention_type'      => $interventionType,
        'execution_type'         => $executionType,
        'is_critical'            => $isCritical,
        'frequency_value'        => $frequencyValue,
        'frequency_unit'         => $frequencyUnit,
        'frequency_note'         => $frequencyNote ?: null,
        'alert_days'             => max(0, $alertDays),
        'assignee_employee_id'   => $assigneeId ?: null,
        'supervisor_employee_id' => $supervisorId ?: null,
        'supplier_id'            => $supplierId ?: null,
        'is_active'              => $isActive,
        'notes'                  => $notes ?: null,
    ];

    if ($id > 0) {
        $stmt = $pdo->prepare("SELECT equipment_id FROM maint_maintenances WHERE id = ?");
        $stmt->execute([$id]);
        $equipmentId = (int)$stmt->fetchColumn();

        if (!$equipmentId) {
            mnt_json_fail('Manutenzione non trovata.');
        }

        $assignments = [];
        foreach (array_keys($values) as $column) {
            $assignments[] = "$column = :$column";
        }

        $stmt = $pdo->prepare("UPDATE maint_maintenances SET " . implode(', ', $assignments) . " WHERE id = :id");
        $stmt->execute($values + ['id' => $id]);

        // frequency may have changed — the due date must follow
        mnt_recalc_maintenance($pdo, $id);
        mnt_log($pdo, 'maintenance_updated', $equipmentId, $id, null, $currentUserId, $values);

        mnt_json_ok(['id' => $id]);
    }

    if ($equipmentId <= 0) {
        mnt_json_fail('Attrezzatura non valida.');
    }

    $stmt = $pdo->prepare("SELECT id FROM inv_equipment WHERE id = ?");
    $stmt->execute([$equipmentId]);
    if (!$stmt->fetchColumn()) {
        mnt_json_fail('Attrezzatura non trovata.');
    }

    $values['equipment_id'] = $equipmentId;
    $values['created_by'] = $currentUserId;

    $columns = array_keys($values);
    $placeholders = array_map(fn($column) => ':' . $column, $columns);

    $stmt = $pdo->prepare(
        "INSERT INTO maint_maintenances (" . implode(', ', $columns) . ")
         VALUES (" . implode(', ', $placeholders) . ")"
    );
    $stmt->execute($values);

    $newId = (int)$pdo->lastInsertId();
    mnt_log($pdo, 'maintenance_created', $equipmentId, $newId, null, $currentUserId, $values);

    mnt_json_ok(['id' => $newId]);
} catch (Throwable $e) {
    mnt_json_fail('Errore: ' . $e->getMessage());
}