///
/// Copyright © 2016-2026 The Thingsboard Authors
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///

import { Component, DestroyRef, forwardRef, Input, OnChanges, OnInit, SimpleChanges } from '@angular/core';
import {
  AbstractControl,
  ControlValueAccessor,
  FormBuilder,
  NG_VALIDATORS,
  NG_VALUE_ACCESSOR,
  ValidationErrors,
  Validator,
  ValidatorFn,
  Validators
} from '@angular/forms';
import { TimeUnit, timeUnitTranslations } from '@home/components/rule-node/rule-node-config.models';
import { isDefinedAndNotNull, isNumeric } from '@core/utils';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { coerceBoolean, coerceNumber } from '@shared/decorators/coercion';
import { DAY, HOUR, MINUTE, SECOND } from '@shared/models/time/time.models';
import { MatFormFieldAppearance, SubscriptSizing } from '@angular/material/form-field';

interface TimeUnitInputModel {
  time: number;
  timeUnit: TimeUnit
}

@Component({
    selector: 'tb-time-unit-input',
    templateUrl: './time-unit-input.component.html',
    providers: [{
            provide: NG_VALUE_ACCESSOR,
            useExisting: forwardRef(() => TimeUnitInputComponent),
            multi: true
        }, {
            provide: NG_VALIDATORS,
            useExisting: forwardRef(() => TimeUnitInputComponent),
            multi: true
        }],
    standalone: false
})
export class TimeUnitInputComponent implements ControlValueAccessor, Validator, OnInit, OnChanges {

  @Input()
  labelText: string;

  @Input()
  hintText: string;

  @Input()
  @coerceBoolean()
  required: boolean;

  @Input()
  requiredText: string;

  @Input()
  @coerceNumber()
  minTime = 0;

  @Input()
  minErrorText: string;

  @Input()
  @coerceNumber()
  maxTime: number;

  @Input()
  maxErrorText: string;

  @Input()
  @coerceNumber()
  stepMultipleOf: number;

  @Input()
  stepMultipleOfErrorText: string;

  @Input()
  subscriptSizing: SubscriptSizing = 'fixed';

  @Input()
  appearance: MatFormFieldAppearance = 'fill';

  @Input()
  @coerceBoolean()
  inlineField: boolean;

  @Input()
  @coerceBoolean()
  sameWidthInputs: boolean = false;

  @Input()
  containerClass: string | string[] | Record<string, boolean | undefined | null> = "flex gap-4";

  timeUnits = Object.values(TimeUnit).filter(item => item !== TimeUnit.MILLISECONDS) as TimeUnit[];

  timeUnitTranslations = timeUnitTranslations;

  timeInputForm = this.fb.group({
    time: [0],
    timeUnit: [TimeUnit.SECONDS]
  });

  private timeIntervalsInSec = new Map<TimeUnit, number>([
    [TimeUnit.DAYS, DAY/SECOND],
    [TimeUnit.HOURS, HOUR/SECOND],
    [TimeUnit.MINUTES, MINUTE/SECOND],
    [TimeUnit.SECONDS, SECOND/SECOND],
  ]);

  minValueValidator = 0;

  private modelValue: number;

  private propagateChange: (value: any) => void = () => {};

  constructor(private fb: FormBuilder,
              private destroyRef: DestroyRef) {
  }

  ngOnInit() {
    if (isDefinedAndNotNull(this.maxTime)) {
      this.updatedAllowTimeUnitInterval(this.maxTime);
    }

    this.refreshTimeValidators();

    this.timeInputForm.get('timeUnit').valueChanges.pipe(
      takeUntilDestroyed(this.destroyRef)
    ).subscribe(() => {
      this.refreshTimeValidators();
      this.timeInputForm.get('time').markAsTouched({onlySelf: true});
    });

    this.timeInputForm.valueChanges.pipe(
      takeUntilDestroyed(this.destroyRef)
    ).subscribe(value => {
      this.updatedModel(value);
    });
  }

  get minValue(): number {
    return Math.ceil(this.minTime / this.timeIntervalsInSec.get(this.timeInputForm.get('timeUnit').value));
  }

  get hasError(): string {
    if (this.timeInputForm.get('time').hasError('required') && this.requiredText) {
      return this.requiredText;
    } else if (this.timeInputForm.get('time').hasError('min') && this.minErrorText) {
      return this.minErrorText;
    } else if (this.timeInputForm.get('time').hasError('max') && this.maxErrorText) {
      return this.maxErrorText;
    } else if (this.timeInputForm.get('time').hasError('stepMultipleOf') && this.stepMultipleOfErrorText) {
      return this.stepMultipleOfErrorText;
    }
  }

  ngOnChanges(changes: SimpleChanges): void {
    for (const propName of Object.keys(changes)) {
      const change = changes[propName];
      if (!change.firstChange && change.currentValue !== change.previousValue) {
        if (propName === 'maxTime') {
          if (isDefinedAndNotNull(this.maxTime)) {
            this.timeUnits = Object.values(TimeUnit).filter(item => item !== TimeUnit.MILLISECONDS) as TimeUnit[];
            this.updatedAllowTimeUnitInterval(this.maxTime);
          }
        }
        if (['minTime', 'maxTime', 'required', 'stepMultipleOf'].includes(propName)) {
          this.refreshTimeValidators();
        }
      }
    }
  }

  registerOnChange(fn: any) {
    this.propagateChange = fn;
  }

  registerOnTouched(_fn: any) {
  }

  setDisabledState(isDisabled: boolean) {
    if (isDisabled) {
      this.timeInputForm.disable({emitEvent: false});
    } else {
      this.timeInputForm.enable({emitEvent: false});
      if(!this.timeInputForm.valid) {
        setTimeout(() => this.updatedModel(this.timeInputForm.value, true))
      }
    }
  }

  writeValue(sec: number) {
    if (sec !== this.modelValue) {
      if (isDefinedAndNotNull(sec) && isNumeric(sec) && Number(sec) !== 0) {
        this.timeInputForm.patchValue(this.parseTime(sec), {emitEvent: true});
        this.modelValue = sec;
      } else {
        this.timeInputForm.patchValue({
          time: 0,
          timeUnit: TimeUnit.SECONDS
        }, {emitEvent: false});
        this.modelValue = 0;
      }
    }
  }

  validate(): ValidationErrors | null {
    return this.timeInputForm.disabled || this.timeInputForm.valid ? null : {
      timeInput: false
    };
  }

  private updatedModel(value: Partial<TimeUnitInputModel>, forceUpdated = false) {
    const time = isDefinedAndNotNull(value.time) ? value.time * this.timeIntervalsInSec.get(value.timeUnit) : null;
    if (this.modelValue !== time || forceUpdated) {
      this.modelValue = time;
      this.propagateChange(time);
    }
  }

  private parseTime(value: number): TimeUnitInputModel {
    for (const [timeUnit, timeValue] of this.timeIntervalsInSec) {
      const calc = value / timeValue;
      if (Number.isInteger(calc)) {
        return {
          time: calc,
          timeUnit: timeUnit
        }
      }
    }
  }

  private createStepMultipleOfValidator(): ValidatorFn {
    return (control: AbstractControl): ValidationErrors | null => {
      const time = control.value;
      if (!isDefinedAndNotNull(time) || !isNumeric(time)) {
        return null;
      }
      const numericTime = Number(time);
      if (numericTime === 0) {
        return null;
      }

      const timeUnit = control.parent?.get('timeUnit')?.value as TimeUnit;
      if (!timeUnit) {
        return null;
      }

      const unitInSec = this.timeIntervalsInSec.get(timeUnit);
      const totalTimeInSec = numericTime * unitInSec;
      const multipleOfVal = this.stepMultipleOf;

      let isValid: boolean;
      if (totalTimeInSec < multipleOfVal) {
        isValid = (multipleOfVal % totalTimeInSec === 0);
      } else {
        isValid = (totalTimeInSec % multipleOfVal === 0);
      }
      return isValid ? null : { stepMultipleOf: true };
    };
  }

  private updatedAllowTimeUnitInterval(maxTime: number) {
    const maxTimeMs = maxTime * SECOND;
    this.timeUnits = Object.values(TimeUnit).filter(item => item !== TimeUnit.MILLISECONDS) as TimeUnit[];
    if (maxTimeMs < MINUTE) {
      this.timeUnits = this.timeUnits.filter(item => item !== TimeUnit.MINUTES && item !== TimeUnit.HOURS && item !== TimeUnit.DAYS);
    } else if (maxTimeMs < HOUR) {
      this.timeUnits = this.timeUnits.filter(item => item !== TimeUnit.HOURS && item !== TimeUnit.DAYS);
    } else if (maxTimeMs < DAY) {
      this.timeUnits = this.timeUnits.filter(item => item !== TimeUnit.DAYS);
    }
  }

  private refreshTimeValidators() {
    const timeControl = this.timeInputForm.get('time');
    if (!timeControl) return;

    const currentUnit = this.timeInputForm.get('timeUnit')?.value as TimeUnit;
    if (!currentUnit) return;

    const secondsInUnit = this.timeIntervalsInSec.get(currentUnit) ?? 1;
    const validators: ValidatorFn[] = [Validators.pattern(/^\d*$/)];

    if (this.required) {
      validators.push(Validators.required);
    }

    if (isDefinedAndNotNull(this.minTime)) {
      this.minValueValidator = Math.ceil(this.minTime / secondsInUnit);
      validators.push(Validators.min(this.minValueValidator));
    } else {
      this.minValueValidator = 0;
      validators.push(Validators.min(this.minValueValidator));
    }

    if (isDefinedAndNotNull(this.maxTime)) {
      const maxInCurrentUnit = Math.floor(this.maxTime / secondsInUnit);
      validators.push(Validators.max(maxInCurrentUnit));
    }

    if (isDefinedAndNotNull(this.stepMultipleOf) && this.stepMultipleOf > 0) {
      validators.push(this.createStepMultipleOfValidator());
    }

    timeControl.setValidators(validators);
    timeControl.updateValueAndValidity({ onlySelf: true, emitEvent: false });
  }
}