<?php

namespace App\Services\Mail;

use App\Models\Mailbox;
use App\Models\User;
use Illuminate\Support\Str;

/**
 * Every mailbox holder gets a Ladill account (users.email = mailbox address).
 * The Ladill login password matches the mailbox password so holders can sign in
 * to account.ladill.com with the same credentials they use for webmail/IMAP.
 */
class MailboxUserProvisioner
{
    public function __construct(private MailboxWebmailVault $vault) {}

    public function ensureForMailbox(Mailbox $mailbox, ?string $password = null): User
    {
        $user = $this->ensureForAddress((string) $mailbox->address, (string) $mailbox->display_name, $password);
        $this->syncHolderPassword($mailbox, $password);

        return $user;
    }

    public function ensureForAddress(string $address, string $displayName = '', ?string $password = null): User
    {
        $email = strtolower(trim($address));
        if ($email === '' || ! str_contains($email, '@')) {
            throw new \InvalidArgumentException('Invalid mailbox address.');
        }

        $attributes = [
            'name' => ($name = trim($displayName) ?: Str::headline(Str::before($email, '@'))),
            'first_name' => Str::before($name, ' '),
            'last_name' => trim(Str::after($name, ' ')) ?: '',
            'password' => $password ?? Str::random(40),
        ];

        $user = User::firstOrCreate(['email' => $email], $attributes);

        if (! $user->wasRecentlyCreated && $password !== null && $password !== '') {
            $user->password = $password;
            $user->save();
        }

        if ($user->email_verified_at === null) {
            $user->forceFill(['email_verified_at' => now()])->save();
        }

        return $user;
    }

    /**
     * Keep the Ladill account password aligned with the mailbox password.
     * Uses the plaintext when available; otherwise copies the stored bcrypt hash.
     */
    public function syncHolderPassword(Mailbox $mailbox, ?string $plaintextPassword = null): void
    {
        $email = strtolower(trim((string) $mailbox->address));
        if ($email === '' || ! str_contains($email, '@')) {
            return;
        }

        $user = User::query()->where('email', $email)->first();
        if (! $user) {
            return;
        }

        if ($plaintextPassword !== null && $plaintextPassword !== '') {
            $user->password = $plaintextPassword;
            $user->save();
            $this->vault->store($mailbox, $plaintextPassword);

            return;
        }

        $hash = (string) $mailbox->password_hash;
        if ($hash !== '') {
            $this->assignPasswordHash($user, $hash);
        }
    }

    public function provisionSilently(string $address, string $displayName = '', ?string $password = null): ?User
    {
        try {
            return $this->ensureForAddress($address, $displayName, $password);
        } catch (\Throwable $e) {
            report($e);

            return null;
        }
    }

    public function provisionMailboxSilently(Mailbox $mailbox, ?string $password = null): ?User
    {
        try {
            return $this->ensureForMailbox($mailbox, $password);
        } catch (\Throwable $e) {
            report($e);

            return null;
        }
    }

    private function assignPasswordHash(User $user, string $passwordHash): void
    {
        $user->getConnection()
            ->table($user->getTable())
            ->where($user->getKeyName(), $user->getKey())
            ->update(['password' => $passwordHash]);
    }
}