<?php

namespace App\Services;

use App\Mail\MembershipActivatedMail;
use App\Mail\PaymentApprovedByAccountantMail;
use App\Mail\PaymentApprovedByCashierMail;
use App\Mail\PaymentFullyApprovedMail;
use App\Mail\PaymentRejectedMail;
use App\Models\Member;
use App\Models\MembershipPayment;
use App\Models\User;
use App\Support\AuditLogger;
use Illuminate\Support\Facades\Mail;

/**
 * Service for handling MembershipPayment verification workflow.
 *
 * Workflow: Cashier → Accountant → Chair
 */
class PaymentVerificationService
{
    /**
     * Approve by Cashier (first tier)
     */
    public function approveByCashier(MembershipPayment $payment, User $user, ?string $notes = null): array
    {
        if (! $payment->canBeApprovedByCashier()) {
            return ['success' => false, 'message' => '此付款無法在此階段由出納審核。'];
        }

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_CASHIER,
            'verified_by_cashier_id' => $user->id,
            'cashier_verified_at' => now(),
            'notes' => $notes ?? $payment->notes,
        ]);

        AuditLogger::log('payment.approved_by_cashier', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => $user->id,
        ]);

        // Notify member
        $this->notifyMember($payment, PaymentApprovedByCashierMail::class);

        // Notify accountants
        $this->notifyRole($payment, 'verify_payments_accountant', PaymentApprovedByCashierMail::class);

        return [
            'success' => true,
            'message' => '出納已審核。已送交會計審核。',
        ];
    }

    /**
     * Approve by Accountant (second tier)
     */
    public function approveByAccountant(MembershipPayment $payment, User $user, ?string $notes = null): array
    {
        if (! $payment->canBeApprovedByAccountant()) {
            return ['success' => false, 'message' => '此付款無法在此階段由會計審核。'];
        }

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_ACCOUNTANT,
            'verified_by_accountant_id' => $user->id,
            'accountant_verified_at' => now(),
            'notes' => $notes ?? $payment->notes,
        ]);

        AuditLogger::log('payment.approved_by_accountant', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => $user->id,
        ]);

        // Notify member
        $this->notifyMember($payment, PaymentApprovedByAccountantMail::class);

        // Notify chairs
        $this->notifyRole($payment, 'verify_payments_chair', PaymentApprovedByAccountantMail::class);

        return [
            'success' => true,
            'message' => '會計已審核。已送交主席審核。',
        ];
    }

    /**
     * Approve by Chair (final tier)
     */
    public function approveByChair(MembershipPayment $payment, User $user, ?string $notes = null): array
    {
        if (! $payment->canBeApprovedByChair()) {
            return ['success' => false, 'message' => '此付款無法在此階段由主席審核。'];
        }

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_CHAIR,
            'verified_by_chair_id' => $user->id,
            'chair_verified_at' => now(),
            'notes' => $notes ?? $payment->notes,
        ]);

        AuditLogger::log('payment.approved_by_chair', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => $user->id,
        ]);

        // Activate membership
        $activationResult = $this->activateMembership($payment);

        // Notify member of full approval
        $this->notifyMember($payment, PaymentFullyApprovedMail::class);

        if ($activationResult) {
            $this->notifyMember($payment, MembershipActivatedMail::class);
        }

        return [
            'success' => true,
            'message' => '主席已審核。付款驗證完成，會員資格已啟用。',
            'membershipActivated' => $activationResult,
        ];
    }

    /**
     * Reject payment at any stage
     */
    public function reject(MembershipPayment $payment, User $user, string $reason): array
    {
        if ($payment->isRejected()) {
            return ['success' => false, 'message' => '此付款已被拒絕。'];
        }

        $payment->update([
            'status' => MembershipPayment::STATUS_REJECTED,
            'rejected_by_user_id' => $user->id,
            'rejected_at' => now(),
            'rejection_reason' => $reason,
        ]);

        AuditLogger::log('payment.rejected', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'rejected_by' => $user->id,
            'reason' => $reason,
        ]);

        // Notify member
        $this->notifyMember($payment, PaymentRejectedMail::class);

        return [
            'success' => true,
            'message' => '付款已拒絕。',
        ];
    }

    /**
     * Activate membership after payment is fully approved
     */
    protected function activateMembership(MembershipPayment $payment): bool
    {
        $member = $payment->member;

        if (! $member) {
            return false;
        }

        // Only activate if member is pending
        if ($member->membership_status !== Member::STATUS_PENDING) {
            return false;
        }

        // Calculate membership dates
        $startDate = now();
        $expiryDate = now()->addYear();

        $member->update([
            'membership_status' => Member::STATUS_ACTIVE,
            'membership_started_at' => $startDate,
            'membership_expires_at' => $expiryDate,
        ]);

        AuditLogger::log('member.activated_via_payment', $member, [
            'payment_id' => $payment->id,
            'started_at' => $startDate,
            'expires_at' => $expiryDate,
        ]);

        return true;
    }

    /**
     * Notify member with given mail class
     */
    protected function notifyMember(MembershipPayment $payment, string $mailClass): void
    {
        if ($payment->member && $payment->member->email) {
            Mail::to($payment->member->email)->queue(new $mailClass($payment));
        }
    }

    /**
     * Notify users with given permission
     */
    protected function notifyRole(MembershipPayment $payment, string $permission, string $mailClass): void
    {
        $users = User::permission($permission)->get();
        foreach ($users as $user) {
            Mail::to($user->email)->queue(new $mailClass($payment));
        }
    }
}