<?php

namespace MintyPHP\Module\Helpdesk\Service;

/**
 * Service for loading debtor detail data (master data, contacts, tickets).
 *
 * Provides both a combined loadDetail() method (legacy) and individual
 * methods for async loading via data endpoints.
 */
class DebitorDetailService
{
    public function __construct(
        private readonly BcODataGateway $bcODataGateway,
        private readonly HelpdeskSettingsGateway $settingsGateway
    ) {
    }

    /**
     * Load only the customer master data (1 OData call).
     *
     * Used by the main page load — contacts and tickets are loaded async.
     *
     * @return array{status: string, customer?: array<string, mixed>, error?: string}
     */
    public function loadCustomer(string $customerNo): array
    {
        $customerNo = trim($customerNo);
        if ($customerNo === '') {
            return ['status' => 'not_found'];
        }

        if (!$this->settingsGateway->isConfigured()) {
            return ['status' => 'not_configured', 'error' => 'BC connection not configured'];
        }

        try {
            $customer = $this->bcODataGateway->getCustomer($customerNo);
        } catch (\Throwable) {
            return ['status' => 'error', 'error' => 'BC connection failed'];
        }

        if ($customer === null) {
            return ['status' => 'not_found'];
        }

        return [
            'status' => 'success',
            'customer' => $customer,
        ];
    }

    /**
     * Load contacts for a customer (for async data endpoint).
     *
     * @return array{ok: bool, contacts?: array<int, array<string, mixed>>, error?: string}
     */
    public function loadContacts(string $customerNo, string $customerName): array
    {
        $customerNo = trim($customerNo);
        $customerName = trim($customerName);

        if ($customerNo === '' || $customerName === '') {
            return ['ok' => false, 'error' => 'Missing customer number or name'];
        }

        if (!$this->settingsGateway->isConfigured()) {
            return ['ok' => false, 'error' => 'BC connection not configured'];
        }

        try {
            $contacts = $this->bcODataGateway->getContactsForCustomer($customerNo, $customerName);
        } catch (\Throwable $e) {
            return ['ok' => false, 'error' => $e->getMessage()];
        }

        return ['ok' => true, 'contacts' => $contacts];
    }

    /**
     * Load tickets for a customer (for async data endpoint).
     *
     * @return array{ok: bool, tickets?: array<int, array<string, mixed>>, error?: string}
     */
    public function loadTickets(string $customerNo, string $customerName): array
    {
        $customerNo = trim($customerNo);
        $customerName = trim($customerName);

        if ($customerNo === '' || $customerName === '') {
            return ['ok' => false, 'error' => 'Missing customer number or name'];
        }

        if (!$this->settingsGateway->isConfigured()) {
            return ['ok' => false, 'error' => 'BC connection not configured'];
        }

        try {
            $tickets = $this->bcODataGateway->getTicketsForCustomer($customerNo, $customerName);
        } catch (\Throwable $e) {
            return ['ok' => false, 'error' => $e->getMessage()];
        }

        return ['ok' => true, 'tickets' => $tickets];
    }

    /**
     * Load a summary of ticket KPIs for a customer (exact counts, not sampled).
     *
     * @return array{ok: bool, total?: int, open?: int, last_activity?: string, error?: string}
     */
    public function loadTicketSummary(string $customerNo, string $customerName): array
    {
        $result = $this->loadTickets($customerNo, $customerName);

        if (!$result['ok']) {
            return $result;
        }

        return self::summarizeTickets($result['tickets'] ?? []);
    }

    /**
     * Aggregate ticket KPIs from a raw ticket array.
     *
     * Used by both the service method and the data endpoint (which has its own cache layer).
     *
     * @param array<int, array<string, mixed>> $tickets
     * @return array{ok: true, total: int, open: int, last_activity: string}
     */
    public static function summarizeTickets(array $tickets): array
    {
        $closedStates = ['Erledigt', 'Resolved', 'Closed', 'Geschlossen'];

        $openCount = 0;
        $lastActivity = '';

        foreach ($tickets as $ticket) {
            $state = (string) ($ticket['Ticket_State'] ?? '');
            if (!in_array($state, $closedStates, true)) {
                $openCount++;
            }

            $activityDate = (string) ($ticket['Last_Activity_Date'] ?? '');
            if ($activityDate !== '' && $activityDate !== '0001-01-01T00:00:00Z' && $activityDate > $lastActivity) {
                $lastActivity = $activityDate;
            }
        }

        return [
            'ok' => true,
            'total' => count($tickets),
            'open' => $openCount,
            'last_activity' => $lastActivity,
        ];
    }

    /**
     * Load activity log for a ticket (for async data endpoint).
     *
     * @return array{ok: bool, log?: array<int, array<string, mixed>>, error?: string}
     */
    public function loadTicketLog(string $ticketNo): array
    {
        $ticketNo = trim($ticketNo);

        if ($ticketNo === '') {
            return ['ok' => false, 'error' => 'Missing ticket number'];
        }

        if (!$this->settingsGateway->isConfigured()) {
            return ['ok' => false, 'error' => 'BC connection not configured'];
        }

        try {
            $log = $this->bcODataGateway->getTicketLog($ticketNo);
        } catch (\Throwable $e) {
            return ['ok' => false, 'error' => $e->getMessage()];
        }

        return ['ok' => true, 'log' => $log];
    }

    /**
     * Load full detail for a debtor: master data, contacts, and tickets.
     *
     * @deprecated Use loadCustomer() + async endpoints for contacts/tickets instead.
     *
     * @return array{status: string, customer?: array<string, mixed>, contacts?: array<int, array<string, mixed>>, tickets?: array<int, array<string, mixed>>, error?: string, contactsError?: string, ticketsError?: string}
     */
    public function loadDetail(string $customerNo): array
    {
        $customerNo = trim($customerNo);
        if ($customerNo === '') {
            return ['status' => 'not_found'];
        }

        if (!$this->settingsGateway->isConfigured()) {
            return ['status' => 'not_configured', 'error' => 'BC connection not configured'];
        }

        try {
            $customer = $this->bcODataGateway->getCustomer($customerNo);
        } catch (\Throwable) {
            return ['status' => 'error', 'error' => 'BC connection failed'];
        }

        if ($customer === null) {
            return ['status' => 'not_found'];
        }

        // Load contacts — BC contacts are linked via Company_Name, not customer number.
        // IntegrationCustomerNo is not filterable in BC OData, so we use the customer name.
        $contacts = [];
        $contactsError = '';
        $customerName = (string) ($customer['Name'] ?? '');
        try {
            $contacts = $this->bcODataGateway->getContactsForCustomer($customerNo, $customerName);
        } catch (\Throwable $e) {
            $contactsError = $e->getMessage();
        }

        // Load tickets via PBI_FP_Tickets entity which supports server-side filtering.
        $tickets = [];
        $ticketsError = '';
        try {
            $tickets = $this->bcODataGateway->getTicketsForCustomer($customerNo, $customerName);
        } catch (\Throwable $e) {
            $ticketsError = $e->getMessage();
        }

        return [
            'status' => 'success',
            'customer' => $customer,
            'contacts' => $contacts,
            'tickets' => $tickets,
            'contactsError' => $contactsError,
            'ticketsError' => $ticketsError,
        ];
    }
}