import { Maybe } from '@/core';
import { NativeBridgeService } from '@/core/services';
import { ToastService } from '@/core/services/toast.service';
import {
  IPayment,
  PosPaymentResult,
  TerminalSuccessPaymentPayload,
  TOrderPaymentTypes,
} from '@/domains/pos/modules/shop/models';
import { PosPaymentBridgeAbstract } from '@/domains/pos/modules/shop/services/payment-bridge.abstract';
import { PosPaymentBridgeService } from '@/domains/pos/modules/shop/services/payment-bridge.service';
import { AbstractFormDialog } from '@/shared/abstractClasses';
import { KeyValueComponent } from '@/shared/components';
import { SharedLightBottomsheetComponent } from '@/shared/components/dialog/light-bottomsheet.component';
import { FormFooterActionsComponent } from '@/shared/components/formFooterActions/form-footer-actions.component';
import { PriceInputComponent } from '@/shared/components/input/price-input.component';
import { UikitFieldComponent, UikitLabelComponent } from '@/uikit';
import { formatWithCurrency } from '@/utils';
import {
  Component,
  EventEmitter,
  inject,
  Input,
  Output,
  signal,
  SimpleChanges,
} from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { FormControl, FormsModule, ReactiveFormsModule, Validators } from '@angular/forms';
import { ButtonDirective } from 'primeng/button';
import { Select } from 'primeng/select';
import { SelectButton } from 'primeng/selectbutton';

@Component({
  selector: 'shared-invoice-payment-form-dialog',
  templateUrl: './form-dialog.component.html',
  imports: [
    FormsModule,
    ReactiveFormsModule,
    FormFooterActionsComponent,
    KeyValueComponent,
    ButtonDirective,
    SharedLightBottomsheetComponent,
    Select,
    UikitFieldComponent,
    SelectButton,
    UikitLabelComponent,
    PriceInputComponent,
  ],
  providers: [{ provide: PosPaymentBridgeAbstract, useExisting: PosPaymentBridgeService }],
})
export class PosPaymentFormDialogComponent extends AbstractFormDialog<IPayment, any> {
  @Input() totalAmount = 0;
  @Input() submitOrderLoading = false;
  @Input() isGoldGuild = false;
  @Input() isUnknownCustomer = false;
  @Output() onSubmitPayment = new EventEmitter<{
    payment: IPayment;
    settlementType: 'CASH' | 'CREDIT' | 'MIXED';
  }>();

  private readonly paymentBridge = inject(PosPaymentBridgeAbstract);
  private readonly nativeBridgeService = inject(NativeBridgeService);
  private readonly toastServices = inject(ToastService);

  readonly settlementTypeItems = [
    {
      label: 'نقدی',
      value: 'CASH',
    },
    {
      label: 'نسیه',
      value: 'CREDIT',
    },
    {
      label: 'نقدی / نسیه',
      value: 'MIXED',
    },
  ];

  readonly selectedSettlementType = signal<'CASH' | 'CREDIT' | 'MIXED'>('CASH');
  readonly remainedAmount = signal(0);
  setOffMax = signal(this.remainedAmount());
  cashMax = signal(this.remainedAmount());
  terminalsMax = signal([this.remainedAmount()]);

  payByTerminalSteps = signal(
    Array.from({ length: 10 }, (_, i) => ({
      value: i + 1,
      payed: false,
      info: {} as TerminalSuccessPaymentPayload,
      label: `${i + 1} مرحله‌ای`,
      amount: 0,
    }))
  );

  selectedPayByTerminalStep = signal(1);

  private restorePaymentCallback: Maybe<() => void> = null;

  private readonly injectedPaymentResultHandler = (payload: PosPaymentResult) => {
    if (payload.status === 'SUCCESS') {
      const paidStepId = this.resolvePaidStepId(payload);
      const terminalId = payload.data?.terminalId || '';
      const stan = payload.data?.stan || '';
      const rrn = payload.data?.rrn || '';
      const customerCardNo = payload.data?.customerCardNO || '';
      const transactionDateTime = payload.data?.transactionDateTime;

      const targetIndex = Math.max(0, paidStepId - 1);
      const prevSteps = this.payByTerminalSteps();
      const steps = [...prevSteps];
      const currentStep = steps[targetIndex];
      if (!currentStep) return;

      steps[targetIndex] = {
        ...currentStep,
        payed: true,
        amount: Number(this.terminalControls[targetIndex]?.value || currentStep.amount || 0),
        info: {
          customer_card_no: customerCardNo,
          description: payload.message || '',
          rrn,
          stan,
          terminal_id: terminalId,
          transaction_date_time: transactionDateTime ? new Date(transactionDateTime) : new Date(),
        },
      };

      this.payByTerminalSteps.set(steps);

      const terminalControl = this.terminalControls[targetIndex];
      if (terminalControl) {
        terminalControl.disable({ onlySelf: true, emitEvent: false });
      }
      const amount = Number(
        terminalControl?.value || this.extractAmountFromPaymentResult(payload) || 0
      );
      let successMessage = '';
      if (this.payByTerminalSteps()?.length > 1) {
        successMessage = `پرداخت مرحله ${paidStepId} به مبلغ ${formatWithCurrency(amount)} با موفقیت انجام شد.`;
      } else {
        successMessage = `پرداخت به مبلغ ${formatWithCurrency(amount)} با موفقیت انجام شد.`;
      }
      this.toastServices.success({
        text: successMessage,
      });
    } else {
      this.toastServices.error({ text: payload.message || 'پرداخت با دستگاه انجام نشد.' });
    }
  };

  ngAfterViewInit() {
    this.restorePaymentCallback = this.paymentBridge.registerPaymentResultListener(
      this.injectedPaymentResultHandler
    );
  }

  private initForm = () => {
    const form = this.fb.group({
      set_off: [0],
      cash: [0],
      terminals: this.fb.array([this.fb.control(0)]),
    });

    form.valueChanges.pipe(takeUntilDestroyed()).subscribe((value) => {
      const terminalTotal =
        (value.terminals || []).reduce((acc, curr) => (acc || 0) + (curr || 0), 0) || 0;

      const totalValue = (value.cash || 0) + (value.set_off || 0) + terminalTotal;
      const remainedAmount = this.totalAmount - totalValue;

      const setOffMax = remainedAmount + (value.set_off || 0);
      const cashMax = remainedAmount + (value.cash || 0);

      form.controls.set_off.clearValidators();
      form.controls.set_off.addValidators([Validators.max(setOffMax)]);
      if (!setOffMax) {
        form.controls.set_off.disable({
          onlySelf: true,
        });
      } else {
        form.controls.set_off.enable({
          onlySelf: true,
        });
      }

      form.controls.cash.clearValidators();
      form.controls.cash.addValidators([Validators.max(cashMax)]);
      if (!cashMax) {
        form.controls.cash.disable({
          onlySelf: true,
        });
      } else {
        form.controls.cash.enable({
          onlySelf: true,
        });
      }

      form.controls.terminals.controls.forEach((terminal, i) => {
        terminal.clearValidators();
        this.terminalsMax.update((max) => {
          const terminalMax = remainedAmount + (terminal.value || 0);
          terminal.addValidators([Validators.max(terminalMax)]);
          if (this.isTerminalStepPaid(i + 1)) {
            terminal.disable({
              onlySelf: true,
            });
          } else if (terminalMax) {
            terminal.enable({
              onlySelf: true,
            });
          } else {
            terminal.disable({
              onlySelf: true,
            });
          }
          return max.map((m, index) => (index === i ? terminalMax : m));
        });
      });

      this.remainedAmount.set(remainedAmount);
      this.cashMax.set(cashMax);
      this.setOffMax.set(setOffMax);
    });

    return form;
  };

  form = this.initForm();
  get terminalControls() {
    return this.form.controls.terminals.controls as FormControl<number | null>[];
  }

  changePayByTerminalSteps(steps: number) {
    const minSteps = this.getMinAllowedSteps();
    const normalizedSteps = Math.max(minSteps, Number(steps) || 1);
    if ((Number(steps) || 1) < minSteps) {
      this.toastServices.warn({
        text: `حداقل تعداد مراحل به دلیل پرداخت های انجام شده ${minSteps} است.`,
      });
    }
    this.selectedPayByTerminalStep.set(normalizedSteps);

    const terminals = this.form.controls.terminals;
    const currentLength = terminals.length;

    if (normalizedSteps > currentLength) {
      for (let i = currentLength; i < normalizedSteps; i += 1) {
        terminals.push(this.fb.control(0));
        const terminalMax = this.remainedAmount();
        this.form.controls.terminals.controls[i].addValidators([Validators.max(terminalMax)]);
        this.terminalsMax.update((max) => [...max, terminalMax]);
      }
      return;
    }

    if (normalizedSteps < currentLength) {
      const removedSum = terminals.controls
        .slice(normalizedSteps)
        .reduce((acc, control) => acc + (control.value || 0), 0);

      this.remainedAmount.update((value) => value + removedSum);

      while (terminals.length > normalizedSteps) {
        terminals.removeAt(terminals.length - 1);
      }

      // terminals.at(0)?.setValue(firstValue + removedSum);
    }
  }

  fillTerminalRemained(index: number) {
    this.fillRemained('TERMINAL', index);
  }

  fillRemained(type: TOrderPaymentTypes, _terminalIndex?: number) {
    switch (type) {
      case 'TERMINAL':
        const terminalIndex = _terminalIndex ?? 0;
        this.form.controls.terminals
          .at(terminalIndex)
          ?.setValue(
            (this.form.controls.terminals.at(terminalIndex)?.value || 0) + this.remainedAmount()
          );
        break;

      case 'CASH':
        this.form.controls.cash.setValue(
          (this.form.controls.cash.value || 0) + this.remainedAmount()
        );
        break;

      case 'SET_OFF':
        this.form.controls.set_off.setValue(
          (this.form.controls.set_off.value || 0) + this.remainedAmount()
        );
        break;
    }
  }

  override showSuccessMessage = false;

  private resetLimits() {
    const amount = Number(this.totalAmount || 0);
    this.remainedAmount.set(amount);
    this.cashMax.set(amount);
    this.setOffMax.set(amount);
    this.terminalsMax.set(this.terminalControls.map(() => amount));
  }

  override ngOnInit(): void {
    super.ngOnInit();
    this.resetLimits();
  }

  override ngOnChanges(changes: SimpleChanges): void {
    super.ngOnChanges(changes);
    if (changes['totalAmount']) {
      this.resetLimits();
    }
  }

  ngOnDestroy() {
    this.restorePaymentCallback?.();
  }

  override submitForm() {
    if (this.selectedSettlementType() === 'CASH') {
      if (this.remainedAmount() > 0) {
        return this.toastServices.warn({
          text: 'صورت‌حساب‌ تسویه نشده است. لطفا مبلغ پرداخت را کامل کنید..',
        });
      }
    }

    const rawPayment = this.form.getRawValue();

    const terminalPayments = this.payByTerminalSteps()
      .slice(0, this.selectedPayByTerminalStep())
      .filter((step) => step.payed)
      .map((step) => ({
        amount: Number(this.terminalControls[step.value - 1]?.value || step.amount || 0),
        terminal_id: step.info.terminal_id || '',
        stan: step.info.stan || '',
        rrn: step.info.rrn || '',
        response_code: '00',
        customer_card_no: step.info.customer_card_no || '',
        transaction_date_time: step.info.transaction_date_time || new Date(),
        description: step.info.description || '',
      }));

    const payment: IPayment = {
      cash: Number(rawPayment.cash || 0),
      set_off: Number(rawPayment.set_off || 0),
      terminals: terminalPayments,
    };

    const terminalPaymentIsDone = this.checkTerminalPayments();

    if (terminalPaymentIsDone) {
      this.onSubmitPayment.emit({
        payment,
        settlementType: this.selectedSettlementType(),
      });
    }
  }

  private checkTerminalPayments(): boolean {
    const pendingTerminalPayments = this.getPendingTerminalPayments();
    if (pendingTerminalPayments.length) {
      // if (this.nativeBridgeService.isEnabled()) {
      const nextPending = pendingTerminalPayments[0];
      this.payByTerminal(nextPending.stepId, nextPending.amount);
      this.toastServices.info({
        text: 'پس از تایید پرداخت هر مرحله، برای مرحله بعد دوباره روی ثبت پرداخت بزنید.',
        life: 3500,
      });
      // } else {
      //   this.toastServices.error({
      //     text: 'امکان ارتباط با دستگاه پرداخت میسر نیست.',
      //   });
      //   return false;
      // }

      return false;
    }

    return true;
  }

  private payByTerminal(id: number, amount: number) {
    // this.paymentBridge.emitPaymentResultForTest({
    //   status: 'SUCCESS',
    //   id: id.toString(),
    //   data: {
    //     customerCardNO: '123',
    //     responseCode: '2',
    //     rrn: 'rrn',
    //     stan: 'stan',
    //     terminalId: 'terminalId',
    //     transactionDateTime: new Date().toISOString(),
    //   },
    // });
    const payResult = this.nativeBridgeService.pay({
      amount,
      id: String(id),
    });
  }

  private isTerminalStepPaid(stepId: number): boolean {
    return this.payByTerminalSteps().some((step) => step.value === stepId && step.payed);
  }

  private getMinAllowedSteps() {
    const paidSteps = this.payByTerminalSteps()
      .slice(0, this.selectedPayByTerminalStep())
      .filter((step) => step.payed)
      .map((step) => step.value);
    return paidSteps.length ? Math.max(...paidSteps) : 1;
  }

  private getPendingTerminalPayments() {
    return this.terminalControls
      .map((control, index) => ({
        stepId: index + 1,
        amount: Number(control.value || 0),
      }))
      .filter(({ stepId, amount }) => amount > 0 && !this.isTerminalStepPaid(stepId));
  }

  private extractAmountFromPaymentResult(payload: unknown): number | null {
    if (!payload || typeof payload !== 'object') return null;
    const amount = (payload as { amount?: unknown }).amount;
    if (typeof amount === 'number' && Number.isFinite(amount)) {
      return amount;
    }
    return null;
  }

  private resolvePaidStepId(payload: PosPaymentResult): number {
    const rawId = Number(payload.id || 0);
    if (rawId > 0 && this.payByTerminalSteps().some((step) => step.value === rawId)) return rawId;

    const pendingStep = this.terminalControls.findIndex(
      (control, index) => Number(control.value || 0) > 0 && !this.isTerminalStepPaid(index + 1)
    );
    return pendingStep >= 0 ? pendingStep + 1 : 1;
  }
}