<?php

namespace App\Http\Controllers\Email;

use App\Http\Controllers\Controller;
use App\Models\EmailSetting;
use App\Models\User;
use App\Services\Billing\BillingClient;
use App\Services\Identity\IdentityClient;
use App\Services\Mailbox\MailboxClient;
use App\Services\Payment\WalletPaymentService;
use App\Support\MailboxPricing;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

/**
 * Account — Wallet, Billing, Settings. Money is read from the one platform
 * UserWallet via the Billing API (tagged 'email'); funding is platform-level, so
 * "Add funds" deep-links to the account portal. Settings are email-local prefs.
 */
class AccountController extends Controller
{
    public function __construct(
        private WalletPaymentService $wallet,
        private BillingClient $billing,
        private MailboxClient $mailboxes,
        private IdentityClient $identity,
    ) {}

    private function topupUrl(): string
    {
        return 'https://'.config('app.account_domain').'/wallet';
    }

    /** Wallet: balance + email spend summary + add-funds link. */
    public function wallet(): View
    {
        $account = ladill_account();
        [$balanceMinor, $ledger] = $this->billingSnapshot($account?->public_id);

        return view('email.account.wallet', [
            'balanceMinor' => $balanceMinor,
            'spentMinor' => (int) ($ledger['spent_minor'] ?? 0),
            'creditedMinor' => (int) ($ledger['credited_minor'] ?? 0),
            'topupUrl' => $this->topupUrl(),
        ]);
    }

    /** Billing: wallet snapshot + recurring paid-mailbox subscriptions. */
    public function billing(): View
    {
        $account = ladill_account();
        [$balanceMinor, $ledger] = $this->billingSnapshot($account?->public_id);

        $paidMailboxes = [];
        $monthlyTotalMinor = 0;
        try {
            foreach ($this->mailboxes->forUser((string) $account?->public_id) as $m) {
                if (! ($m['is_paid'] ?? false)) {
                    continue;
                }
                $m['price_minor'] = MailboxPricing::priceMinorFor((int) ($m['quota_mb'] ?? 0));
                $m['quota_label'] = MailboxPricing::label((int) ($m['quota_mb'] ?? 0));
                $monthlyTotalMinor += $m['price_minor'];
                $paidMailboxes[] = $m;
            }
        } catch (\Throwable $e) {
            report($e);
        }

        return view('email.account.billing', [
            'balanceMinor' => $balanceMinor,
            'spentMinor' => (int) ($ledger['spent_minor'] ?? 0),
            'creditedMinor' => (int) ($ledger['credited_minor'] ?? 0),
            'paidMailboxes' => $paidMailboxes,
            'monthlyTotalMinor' => $monthlyTotalMinor,
            'topupUrl' => $this->topupUrl(),
        ]);
    }

    public function settings(): View
    {
        $account = ladill_account();
        $settings = EmailSetting::firstOrNew(['user_id' => $account?->id]);
        ['linkStatus' => $linkStatus, 'mailboxOptions' => $mailboxOptions, 'showMailboxLinkUi' => $showMailboxLinkUi] = $this->mailboxLinkContext($account);

        return view('email.account.settings', [
            'account' => $account,
            'settings' => $settings,
            'linkStatus' => $linkStatus,
            'mailboxOptions' => $mailboxOptions,
            'showMailboxLinkUi' => $showMailboxLinkUi,
        ]);
    }

    public function linkMailbox(Request $request): RedirectResponse
    {
        $account = ladill_account();

        $data = $request->validate([
            'mailbox_address' => ['required', 'email', 'max:255'],
        ]);

        try {
            $result = $this->identity->linkMailbox(
                (string) $account->public_id,
                $data['mailbox_address'],
            );
        } catch (\Illuminate\Http\Client\RequestException $e) {
            $message = (string) $e->response?->json('message', '');
            if ($message !== '') {
                return redirect()->route('account.settings')->with('error', $message);
            }

            report($e);

            return redirect()->route('account.settings')->with('error', 'Could not link mailbox. Try again in a moment, or contact support if this keeps happening.');
        } catch (\Throwable $e) {
            report($e);

            return redirect()->route('account.settings')->with('error', 'Could not link mailbox. Try again in a moment, or contact support if this keeps happening.');
        }

        $request->session()->forget('mailbox_link_banner_dismissed');

        $connectUrl = (string) ($result['webmail_connect_url'] ?? '');
        if ($connectUrl === '') {
            $connectUrl = rtrim((string) config('services.ladill_webmail.url', 'https://mail.ladill.com'), '/').'/sso/connect';
        }

        return redirect()->away($connectUrl);
    }

    public function unlinkMailbox(Request $request): RedirectResponse
    {
        $account = ladill_account();

        try {
            $this->identity->unlinkMailbox((string) $account->public_id);
        } catch (\Illuminate\Http\Client\RequestException $e) {
            $message = (string) $e->response?->json('message', '');
            if ($message !== '') {
                return redirect()->route('account.settings')->with('error', $message);
            }

            report($e);

            return redirect()->route('account.settings')->with('error', 'Could not unlink mailbox. Try again in a moment.');
        } catch (\Throwable $e) {
            report($e);

            return redirect()->route('account.settings')->with('error', 'Could not unlink mailbox. Try again in a moment.');
        }

        $request->session()->forget('mailbox_link_banner_dismissed');

        return redirect()->route('account.settings')->with('success', 'Mailbox unlinked from your Ladill account.');
    }

    /** @return array{linkStatus: array<string, mixed>, mailboxOptions: array<int, array<string, mixed>>, showMailboxLinkUi: bool} */
    private function mailboxLinkContext(?User $account): array
    {
        $linkStatus = ['show_reminder' => false];
        $mailboxOptions = [];

        if (! $account?->public_id) {
            return [
                'linkStatus' => $linkStatus,
                'mailboxOptions' => $mailboxOptions,
                'showMailboxLinkUi' => false,
            ];
        }

        try {
            $mailboxOptions = $this->mailboxes->forUser((string) $account->public_id);
        } catch (\Throwable $e) {
            report($e);
        }

        try {
            $linkStatus = $this->identity->mailboxLinkStatus((string) $account->public_id);
        } catch (\Throwable $e) {
            report($e);
            $linkStatus = $this->localMailboxLinkStatus($account, $mailboxOptions);
        }

        $showMailboxLinkUi = (bool) ($linkStatus['linked_mailbox'] ?? null)
            || ($linkStatus['show_reminder'] ?? false)
            || $this->localNeedsMailboxLink($account, $mailboxOptions, $linkStatus);

        return [
            'linkStatus' => $linkStatus,
            'mailboxOptions' => $mailboxOptions,
            'showMailboxLinkUi' => $showMailboxLinkUi,
        ];
    }

    /** @param  array<int, array<string, mixed>>  $mailboxOptions */
    private function localNeedsMailboxLink(User $account, array $mailboxOptions, array $linkStatus): bool
    {
        if ($linkStatus['linked_mailbox'] ?? null) {
            return false;
        }

        $email = strtolower(trim($account->email ?? ''));
        if ($email === '') {
            return false;
        }

        foreach ($mailboxOptions as $mailbox) {
            if (strtolower((string) ($mailbox['address'] ?? '')) === $email) {
                return false;
            }
        }

        return count($mailboxOptions) > 0;
    }

    /** @param  array<int, array<string, mixed>>  $mailboxOptions */
    /** @return array<string, mixed> */
    private function localMailboxLinkStatus(User $account, array $mailboxOptions): array
    {
        $needsLink = $this->localNeedsMailboxLink($account, $mailboxOptions, []);

        return [
            'show_reminder' => $needsLink,
            'stage' => count($mailboxOptions) > 0 ? 'needs_link' : 'needs_mailbox',
            'linked_mailbox' => null,
            'account_email' => $account->email,
        ];
    }

    public function updateSettings(Request $request): RedirectResponse
    {
        $account = ladill_account();

        $data = $request->validate([
            'default_quota_mb' => ['nullable', 'integer', 'min:256', 'max:153600'],
            'notify_email' => ['nullable', 'email', 'max:255'],
            'product_updates' => ['nullable', 'boolean'],
        ]);

        EmailSetting::updateOrCreate(
            ['user_id' => $account->id],
            [
                'default_quota_mb' => $data['default_quota_mb'] ?? null,
                'notify_email' => $data['notify_email'] ?? null,
                'product_updates' => $request->boolean('product_updates'),
            ],
        );

        return redirect()->route('account.settings')->with('success', 'Settings saved.');
    }

    /**
     * @return array{0:int,1:array<string,mixed>} [balanceMinor, ledger]
     */
    private function billingSnapshot(?string $publicId): array
    {
        if (! $publicId) {
            return [0, []];
        }

        try {
            return [
                $this->wallet->balanceMinor(ladill_account()),
                $this->billing->serviceLedger($publicId, (string) config('billing.service', 'email')),
            ];
        } catch (\Throwable $e) {
            report($e);

            return [0, []];
        }
    }
}