<?php

namespace Modules\Tms\Services;

use Modules\Maintenance\Models\Equipment;
use Modules\Maintenance\Models\FieldMission;
use Modules\Maintenance\Models\InspectionVisit;
use Modules\Maintenance\Models\MissionCrewMember;
use Modules\Maintenance\Models\Overhaul;
use Modules\Maintenance\Models\RebuildProject;
use Modules\Maintenance\Models\WorkOrder;
use Modules\Tms\Models\Driver;
use Modules\Tms\Models\Shipment;
use Modules\Tms\Utils\TmsUtil;

class TmsMissionSyncService
{
    public function __construct(protected TmsUtil $tmsUtil) {}

    public function resolveProjectIdFromMission(FieldMission $mission): ?int
    {
        if ($mission->source_id && $mission->source_type !== 'standalone') {
            $projectId = match ($mission->source_type) {
                'overhaul' => Overhaul::where('business_id', $mission->business_id)->find($mission->source_id)?->project_id,
                'rebuild' => RebuildProject::where('business_id', $mission->business_id)->find($mission->source_id)?->project_id,
                'work_order' => WorkOrder::where('business_id', $mission->business_id)->find($mission->source_id)?->project_id,
                'inspection_visit' => InspectionVisit::where('business_id', $mission->business_id)->find($mission->source_id)?->project_id,
                default => null,
            };

            if ($projectId) {
                return (int) $projectId;
            }
        }

        if ($mission->equipment_id) {
            return Equipment::where('business_id', $mission->business_id)
                ->find($mission->equipment_id)?->project_id;
        }

        return null;
    }

    public function findShipmentForMission(FieldMission $mission): ?Shipment
    {
        return Shipment::where('business_id', $mission->business_id)
            ->where('source_type', 'field_mission')
            ->where('source_id', $mission->id)
            ->where('status', '!=', 'cancelled')
            ->orderByDesc('id')
            ->first();
    }

    public function resolveDriverId(FieldMission $mission): ?int
    {
        $mission->loadMissing('crewMembers');

        $driverCrew = $mission->crewMembers->first(fn (MissionCrewMember $m) => $m->role === 'driver' && $m->user_id);

        if ($driverCrew?->user_id) {
            $driver = Driver::where('business_id', $mission->business_id)
                ->where('user_id', $driverCrew->user_id)
                ->where('is_active', true)
                ->first();

            if ($driver) {
                return (int) $driver->id;
            }
        }

        if ($mission->lead_user_id) {
            $driver = Driver::where('business_id', $mission->business_id)
                ->where('user_id', $mission->lead_user_id)
                ->where('is_active', true)
                ->first();

            return $driver ? (int) $driver->id : null;
        }

        return null;
    }

    public function resolveMissionDestination(FieldMission $mission): ?string
    {
        if (! empty($mission->destination_site)) {
            return $mission->destination_site;
        }

        $mission->loadMissing('destinationLocation');
        $loc = $mission->destinationLocation;

        if (! $loc) {
            return null;
        }

        return trim(implode(' ', array_filter([
            $loc->name,
            $loc->landmark ?? null,
            $loc->city ?? null,
        ]))) ?: null;
    }

    public function buildCargoDescription(FieldMission $mission): string
    {
        $mission->loadMissing(['items.sparePart']);

        $parts = $mission->items
            ->map(fn ($item) => $item->part_name ?: $item->sparePart?->name)
            ->filter()
            ->take(5)
            ->values()
            ->all();

        if (empty($parts)) {
            return $mission->title;
        }

        return $mission->title.' — '.implode(', ', $parts);
    }

    public function syncMissionFromShipment(Shipment $shipment): void
    {
        if ($shipment->source_type !== 'field_mission' || ! $shipment->source_id) {
            return;
        }

        $settings = $this->tmsUtil->getTmsSettings((int) $shipment->business_id);
        if (empty($settings['sync_mission_status'])) {
            return;
        }

        if (! class_exists(FieldMission::class)) {
            return;
        }

        $mission = FieldMission::where('business_id', $shipment->business_id)
            ->find($shipment->source_id);

        if (! $mission || in_array($mission->status, ['closed', 'cancelled'], true)) {
            return;
        }

        $missionStatus = match ($shipment->status) {
            'in_transit' => 'dispatched',
            'delivered' => 'on_site',
            'cancelled' => 'cancelled',
            default => null,
        };

        if (! $missionStatus) {
            return;
        }

        $order = [
            'draft' => 0,
            'planned' => 1,
            'dispatched' => 2,
            'on_site' => 3,
            'returning' => 4,
            'closed' => 5,
            'cancelled' => 6,
        ];

        if (($order[$missionStatus] ?? 0) <= ($order[$mission->status] ?? 0)) {
            return;
        }

        $updates = ['status' => $missionStatus];

        if ($missionStatus === 'dispatched' && ! $mission->actual_departure_at) {
            $updates['actual_departure_at'] = $shipment->pickup_at ?? now();
        }

        $mission->update($updates);
    }
}