<?php

namespace App\Models;

use App\Models\Concerns\HasUuid;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\UniqueConstraintViolationException;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;

class Customer extends Model
{
    /** Comparable form: spaces and punctuation are cosmetic in a VAT number. */
    public static function normaliseVatId(?string $value): string
    {
        return strtoupper(preg_replace('/[\s.-]+/', '', (string) $value) ?? '');
    }

    public function normalisedVatId(): string
    {
        return self::normaliseVatId($this->vat_id);
    }

    /**
     * True only for the value that was actually checked. Binding it to the
     * value rather than to a flag means editing the field cannot inherit the
     * old confirmation, whichever code path does the editing.
     */
    public function hasVerifiedVatId(): bool
    {
        // Both sides normalised: a verifier that stores the number in display
        // form ("DE 811 907 980") must not invalidate a genuine confirmation.
        return $this->vat_id_verified_at !== null
            && $this->normalisedVatId() !== ''
            && $this->normalisedVatId() === self::normaliseVatId($this->vat_id_verified_value);
    }

    /** @use HasFactory<\Database\Factories\CustomerFactory> */
    use HasFactory, HasUuid;

    protected $fillable = [
        'user_id', 'name', 'contact_name', 'email', 'phone', 'vat_id', 'vat_id_verified_at', 'vat_id_verified_value', 'billing_address',
        'locale', 'stripe_customer_id', 'status', 'closed_at',
        'brand_display_name', 'brand_logo_path', 'brand_primary_color', 'brand_accent_color',
    ];

    protected function casts(): array
    {
        return ['closed_at' => 'datetime', 'vat_id_verified_at' => 'datetime'];
    }

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

    /**
     * Resolve branding: customer values where set, else CluPilot defaults. Used
     * for previews and snapshotted into the provisioning run so retries are
     * deterministic. NULL is stored for "unset" — defaults are never copied in.
     *
     * @return array{display_name:string,logo_path:?string,primary_color:string,accent_color:string,is_default:bool}
     */
    public function brandingResolved(): array
    {
        $defaults = (array) config('provisioning.branding_defaults');

        return [
            'display_name' => $this->brand_display_name ?: ($defaults['display_name'] ?? 'CluPilot'),
            'logo_path' => $this->brand_logo_path ?: ($defaults['logo_path'] ?? null),
            'primary_color' => $this->brand_primary_color ?: ($defaults['primary_color'] ?? '#f97316'),
            'accent_color' => $this->brand_accent_color ?: ($defaults['accent_color'] ?? '#c2560a'),
            'is_default' => $this->brand_display_name === null
                && $this->brand_logo_path === null
                && $this->brand_primary_color === null
                && $this->brand_accent_color === null,
        ];
    }

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

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

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

    /**
     * Find or create the portal login account for this customer and link it.
     * Race-safe against the unique email index. Never links an operator
     * account by construction, not by a runtime check: operators live in
     * `operators`, on their own guard, and are never rows in `users` at all
     * (see R21) — there is no longer an admin `users` row this could find.
     */
    public function ensureUser(): User
    {
        if ($this->user) {
            return $this->user;
        }

        if (($existing = User::query()->where('email', $this->email)->first()) !== null) {
            $this->update(['user_id' => $existing->id]);

            return $existing;
        }

        try {
            $user = User::query()->create([
                'email' => $this->email,
                'name' => $this->name,
                'password' => Hash::make(Str::random(40)),
            ]);
        } catch (UniqueConstraintViolationException) {
            // Concurrent first-time creation — re-fetch and link the winner.
            $user = User::query()->where('email', $this->email)->firstOrFail();
        }

        $this->update(['user_id' => $user->id]);

        return $user->refresh();
    }
}