<?php

namespace Modules\Core\Shipping\Models;

use Illuminate\Database\Eloquent\Casts\AsArrayObject;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Lunar\Models\Order;
use Lunar\Shipping\Facades\Shipping;

class Shipment extends Model
{
    /** Created from our admin through the carrier's API. */
    public const SOURCE_CREATED = 'created';

    /** An integrated carrier's voucher whose number staff typed in (API down, or the courier's own voucher). */
    public const SOURCE_MANUAL_VOUCHER = 'manual_voucher';

    /** A carrier with no integration (the `manual` shipping driver); tracked by hand. */
    public const SOURCE_MANUAL = 'manual';

    /** Pulled from a carrier's own voucher list; may not be linked to an order yet. */
    public const SOURCE_SYNCED = 'synced';

    protected $guarded = [];

    protected $casts = [
        'meta' => AsArrayObject::class,
        'label_printed_at' => 'datetime',
        'cancelled_at' => 'datetime',
    ];

    public function order(): BelongsTo
    {
        return $this->belongsTo(Order::class);
    }

    public function manifest(): BelongsTo
    {
        return $this->belongsTo(Manifest::class);
    }

    public function shipmentInfo(): HasMany
    {
        return $this->hasMany(ShipmentInfo::class);
    }

    public function latestShipmentInfo(): ?ShipmentInfo
    {
        return $this->shipmentInfo()->latest('occurred_at')->first();
    }

    /**
     * The carrier's display name: a manual carrier's own name (snapshotted
     * from its shipping method), otherwise the shipping driver's name().
     */
    public function carrierLabel(): string
    {
        if (filled($this->meta['carrier_name'] ?? null)) {
            return $this->meta['carrier_name'];
        }

        $driver = collect(Shipping::getSupportedDrivers())->get($this->carrier);

        return $driver?->name() ?? ucwords(str_replace('-', ' ', $this->carrier));
    }

    /**
     * A link to the carrier's own tracking page — manual carriers only.
     * Integrated carriers' history is synced, so customers follow it on
     * our own order page instead.
     */
    public function trackingUrl(): ?string
    {
        $template = $this->meta['tracking_url'] ?? null;

        if ($this->source !== self::SOURCE_MANUAL || blank($template) || blank($this->tracking_reference)) {
            return null;
        }

        return str_replace('{number}', rawurlencode($this->tracking_reference), $template);
    }

    public function isCancelled(): bool
    {
        return $this->cancelled_at !== null;
    }

    /**
     * A return voucher (coming back to us), from a carrier's list. Its
     * checkpoints must never drive the order's own status.
     */
    public function isReturn(): bool
    {
        return (bool) ($this->meta['is_return'] ?? false);
    }

    /**
     * Whether this shipment's carrier checkpoints should move its order's
     * status (dispatched / delivered / delivery failed).
     */
    public function drivesOrderStatus(): bool
    {
        return $this->order_id !== null && ! $this->isReturn() && ! $this->isCancelled();
    }

    /**
     * Only shipments created through the carrier's API have a label to
     * print — manual carriers, typed-in vouchers and synced ones don't.
     */
    public function hasCarrierLabel(): bool
    {
        return $this->source === self::SOURCE_CREATED && ! $this->isCancelled();
    }

    /**
     * Cancelling a manual carrier's shipment or a typed-in voucher is a
     * local record change only — there's nothing to cancel at the carrier
     * through the API.
     */
    public function cancelsLocallyOnly(): bool
    {
        return in_array($this->source, [self::SOURCE_MANUAL, self::SOURCE_MANUAL_VOUCHER, self::SOURCE_SYNCED], true);
    }

    /**
     * This parcel's place in a multi-parcel send, for display — e.g.
     * "Main voucher · parcel 1 of 3" or "Parcel 2 of 3 · of NZ000987399GR".
     * Null for a single-parcel shipment.
     *
     * Read from what's already stored: the piece numbers in meta (sends
     * created as multi-parcel), else parent_reference (the main voucher's
     * number, set on issued extra parcels — also ACS multi-part vouchers).
     */
    public function parcelDescription(): ?string
    {
        $piece = $this->meta['piece'] ?? null;
        $pieces = $this->meta['pieces'] ?? null;

        if ($piece && $pieces > 1) {
            if ((int) $piece === 1) {
                return "Main voucher · parcel 1 of {$pieces}";
            }

            $main = $this->parent_reference ?? 'the main voucher (not issued yet)';

            return "Parcel {$piece} of {$pieces} · of {$main}";
        }

        if (filled($this->parent_reference)) {
            return "Extra parcel · of {$this->parent_reference}";
        }

        if (filled($this->tracking_reference)
            && static::where('parent_reference', $this->tracking_reference)->exists()) {
            return 'Main voucher';
        }

        return null;
    }
}