import { extend } from '../../vue';
import { NAME_FORM_SPINBUTTON } from '../../constants/components';
import { EVENT_NAME_CHANGE } from '../../constants/events';
import { PROP_TYPE_BOOLEAN_NUMBER, PROP_TYPE_STRING, PROP_TYPE_FUNCTION, PROP_TYPE_BOOLEAN, PROP_TYPE_ARRAY_STRING, PROP_TYPE_NUMBER_STRING } from '../../constants/props';
import { CODE_UP, CODE_DOWN, CODE_PAGEUP, CODE_PAGEDOWN, CODE_HOME, CODE_END } from '../../constants/key-codes';
import { SLOT_NAME_DECREMENT, SLOT_NAME_INCREMENT } from '../../constants/slots';
import { concat, arrayIncludes } from '../../utils/array';
import { attemptFocus, attemptBlur } from '../../utils/dom';
import { stopEvent, eventOnOff } from '../../utils/events';
import { identity } from '../../utils/identity';
import { isNull } from '../../utils/inspect';
import { isLocaleRTL } from '../../utils/locale';
import { mathFloor, mathMax, mathPow, mathRound } from '../../utils/math';
import { makeModelMixin } from '../../utils/model';
import { toFloat, toInteger } from '../../utils/number';
import { sortKeys, omit } from '../../utils/object';
import { makePropsConfigurable, makeProp, hasPropFunction } from '../../utils/props';
import { toString } from '../../utils/string';
import { attrsMixin } from '../../mixins/attrs';
import { props as props$3, formSizeMixin } from '../../mixins/form-size';
import { props as props$4, formStateMixin } from '../../mixins/form-state';
import { props as props$1, idMixin } from '../../mixins/id';
import { normalizeSlotMixin } from '../../mixins/normalize-slot';
import { props as props$2 } from '../../mixins/form-control';
import { BIconDash, BIconPlus } from '../../icons/icons';

// --- Constants ---

const {
  mixin: modelMixin,
  props: modelProps,
  prop: MODEL_PROP_NAME,
  event: MODEL_EVENT_NAME
} = makeModelMixin('value', {
  // Should this really be String, to match native number inputs?
  type: PROP_TYPE_BOOLEAN_NUMBER
});

// Default for spin button range and step
const DEFAULT_MIN = 1;
const DEFAULT_MAX = 100;
const DEFAULT_STEP = 1;

// Delay before auto-repeat in ms
const DEFAULT_REPEAT_DELAY = 500;
// Repeat interval in ms
const DEFAULT_REPEAT_INTERVAL = 100;
// Repeat rate increased after number of repeats
const DEFAULT_REPEAT_THRESHOLD = 10;
// Repeat speed multiplier (step multiplier, must be an integer)
const DEFAULT_REPEAT_MULTIPLIER = 4;
const KEY_CODES = [CODE_UP, CODE_DOWN, CODE_HOME, CODE_END, CODE_PAGEUP, CODE_PAGEDOWN];

// --- Props ---

const props = makePropsConfigurable(sortKeys({
  ...props$1,
  ...modelProps,
  ...omit(props$2, ['required', 'autofocus']),
  ...props$3,
  ...props$4,
  ariaControls: makeProp(PROP_TYPE_STRING),
  ariaLabel: makeProp(PROP_TYPE_STRING),
  formatterFn: makeProp(PROP_TYPE_FUNCTION),
  inline: makeProp(PROP_TYPE_BOOLEAN, false),
  labelDecrement: makeProp(PROP_TYPE_STRING, 'Decrement'),
  labelIncrement: makeProp(PROP_TYPE_STRING, 'Increment'),
  locale: makeProp(PROP_TYPE_ARRAY_STRING),
  max: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_MAX),
  min: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_MIN),
  placeholder: makeProp(PROP_TYPE_STRING),
  readonly: makeProp(PROP_TYPE_BOOLEAN, false),
  repeatDelay: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_REPEAT_DELAY),
  repeatInterval: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_REPEAT_INTERVAL),
  repeatStepMultiplier: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_REPEAT_MULTIPLIER),
  repeatThreshold: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_REPEAT_THRESHOLD),
  step: makeProp(PROP_TYPE_NUMBER_STRING, DEFAULT_STEP),
  vertical: makeProp(PROP_TYPE_BOOLEAN, false),
  wrap: makeProp(PROP_TYPE_BOOLEAN, false)
}), NAME_FORM_SPINBUTTON);

// --- Main Component ---

// @vue/component
const BFormSpinbutton = /*#__PURE__*/extend({
  name: NAME_FORM_SPINBUTTON,
  // Mixin order is important!
  mixins: [attrsMixin, idMixin, modelMixin, formSizeMixin, formStateMixin, normalizeSlotMixin],
  inheritAttrs: false,
  props,
  data() {
    return {
      localValue: toFloat(this[MODEL_PROP_NAME], null),
      hasFocus: false
    };
  },
  computed: {
    required() {
      return false;
    },
    spinId() {
      return this.safeId();
    },
    computedInline() {
      return this.inline && !this.vertical;
    },
    computedReadonly() {
      return this.readonly && !this.disabled;
    },
    computedRequired() {
      return this.required && !this.computedReadonly && !this.disabled;
    },
    computedStep() {
      return toFloat(this.step, DEFAULT_STEP);
    },
    computedMin() {
      return toFloat(this.min, DEFAULT_MIN);
    },
    computedMax() {
      // We round down to the nearest maximum step value
      const max = toFloat(this.max, DEFAULT_MAX);
      const step = this.computedStep;
      const min = this.computedMin;
      return mathFloor((max - min) / step) * step + min;
    },
    computedDelay() {
      const delay = toInteger(this.repeatDelay, 0);
      return delay > 0 ? delay : DEFAULT_REPEAT_DELAY;
    },
    computedInterval() {
      const interval = toInteger(this.repeatInterval, 0);
      return interval > 0 ? interval : DEFAULT_REPEAT_INTERVAL;
    },
    computedThreshold() {
      return mathMax(toInteger(this.repeatThreshold, DEFAULT_REPEAT_THRESHOLD), 1);
    },
    computedStepMultiplier() {
      return mathMax(toInteger(this.repeatStepMultiplier, DEFAULT_REPEAT_MULTIPLIER), 1);
    },
    computedPrecision() {
      // Quick and dirty way to get the number of decimals
      const step = this.computedStep;
      return mathFloor(step) === step ? 0 : (step.toString().split('.')[1] || '').length;
    },
    computedMultiplier() {
      return mathPow(10, this.computedPrecision || 0);
    },
    valueAsFixed() {
      const value = this.localValue;
      return isNull(value) ? '' : value.toFixed(this.computedPrecision);
    },
    computedLocale() {
      const locales = concat(this.locale).filter(identity);
      const nf = new Intl.NumberFormat(locales);
      return nf.resolvedOptions().locale;
    },
    computedRTL() {
      return isLocaleRTL(this.computedLocale);
    },
    defaultFormatter() {
      // Returns and `Intl.NumberFormat` formatter method reference
      const precision = this.computedPrecision;
      const nf = new Intl.NumberFormat(this.computedLocale, {
        style: 'decimal',
        useGrouping: false,
        minimumIntegerDigits: 1,
        minimumFractionDigits: precision,
        maximumFractionDigits: precision,
        notation: 'standard'
      });
      // Return the format method reference
      return nf.format;
    },
    computedFormatter() {
      const {
        formatterFn
      } = this;
      return hasPropFunction(formatterFn) ? formatterFn : this.defaultFormatter;
    },
    computedAttrs() {
      return {
        ...this.bvAttrs,
        role: 'group',
        lang: this.computedLocale,
        tabindex: this.disabled ? null : '-1',
        title: this.ariaLabel
      };
    },
    computedSpinAttrs() {
      const {
        spinId,
        localValue: value,
        computedRequired: required,
        disabled,
        state,
        computedFormatter
      } = this;
      const hasValue = !isNull(value);
      return {
        dir: this.computedRTL ? 'rtl' : 'ltr',
        ...this.bvAttrs,
        id: spinId,
        role: 'spinbutton',
        tabindex: disabled ? null : '0',
        'aria-live': 'off',
        'aria-label': this.ariaLabel || null,
        'aria-controls': this.ariaControls || null,
        // TODO: May want to check if the value is in range
        'aria-invalid': state === false || !hasValue && required ? 'true' : null,
        'aria-required': required ? 'true' : null,
        // These attrs are required for role spinbutton
        'aria-valuemin': toString(this.computedMin),
        'aria-valuemax': toString(this.computedMax),
        // These should be `null` if the value is out of range
        // They must also be non-existent attrs if the value is out of range or `null`
        'aria-valuenow': hasValue ? value : null,
        'aria-valuetext': hasValue ? computedFormatter(value) : null
      };
    }
  },
  watch: {
    [MODEL_PROP_NAME](value) {
      this.localValue = toFloat(value, null);
    },
    localValue(value) {
      this.$emit(MODEL_EVENT_NAME, value);
    },
    disabled(disabled) {
      if (disabled) {
        this.clearRepeat();
      }
    },
    readonly(readonly) {
      if (readonly) {
        this.clearRepeat();
      }
    }
  },
  created() {
    // Create non reactive properties
    this.$_autoDelayTimer = null;
    this.$_autoRepeatTimer = null;
    this.$_keyIsDown = false;
  },
  beforeDestroy() {
    this.clearRepeat();
  },
  /* istanbul ignore next */
  deactivated() {
    this.clearRepeat();
  },
  methods: {
    // --- Public methods ---
    focus() {
      if (!this.disabled) {
        attemptFocus(this.$refs.spinner);
      }
    },
    blur() {
      if (!this.disabled) {
        attemptBlur(this.$refs.spinner);
      }
    },
    // --- Private methods ---
    emitChange() {
      this.$emit(EVENT_NAME_CHANGE, this.localValue);
    },
    stepValue(direction) {
      // Sets a new incremented or decremented value, supporting optional wrapping
      // Direction is either +1 or -1 (or a multiple thereof)
      let value = this.localValue;
      if (!this.disabled && !isNull(value)) {
        const step = this.computedStep * direction;
        const min = this.computedMin;
        const max = this.computedMax;
        const multiplier = this.computedMultiplier;
        const wrap = this.wrap;
        // We ensure that the value steps like a native input
        value = mathRound((value - min) / step) * step + min + step;
        // We ensure that precision is maintained (decimals)
        value = mathRound(value * multiplier) / multiplier;
        // Handle if wrapping is enabled
        this.localValue = value > max ? wrap ? min : max : value < min ? wrap ? max : min : value;
      }
    },
    onFocusBlur(event) {
      this.hasFocus = this.disabled ? false : event.type === 'focus';
    },
    stepUp() {
      let multiplier = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
      const value = this.localValue;
      if (isNull(value)) {
        this.localValue = this.computedMin;
      } else {
        this.stepValue(+1 * multiplier);
      }
    },
    stepDown() {
      let multiplier = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
      const value = this.localValue;
      if (isNull(value)) {
        this.localValue = this.wrap ? this.computedMax : this.computedMin;
      } else {
        this.stepValue(-1 * multiplier);
      }
    },
    onKeydown(event) {
      const {
        keyCode,
        altKey,
        ctrlKey,
        metaKey
      } = event;
      /* istanbul ignore if */
      if (this.disabled || this.readonly || altKey || ctrlKey || metaKey) {
        return;
      }
      if (arrayIncludes(KEY_CODES, keyCode)) {
        // https://w3c.github.io/aria-practices/#spinbutton
        stopEvent(event, {
          propagation: false
        });
        /* istanbul ignore if */
        if (this.$_keyIsDown) {
          // Keypress is already in progress
          return;
        }
        this.resetTimers();
        if (arrayIncludes([CODE_UP, CODE_DOWN], keyCode)) {
          // The following use the custom auto-repeat handling
          this.$_keyIsDown = true;
          if (keyCode === CODE_UP) {
            this.handleStepRepeat(event, this.stepUp);
          } else if (keyCode === CODE_DOWN) {
            this.handleStepRepeat(event, this.stepDown);
          }
        } else {
          // These use native OS key repeating
          if (keyCode === CODE_PAGEUP) {
            this.stepUp(this.computedStepMultiplier);
          } else if (keyCode === CODE_PAGEDOWN) {
            this.stepDown(this.computedStepMultiplier);
          } else if (keyCode === CODE_HOME) {
            this.localValue = this.computedMin;
          } else if (keyCode === CODE_END) {
            this.localValue = this.computedMax;
          }
        }
      }
    },
    onKeyup(event) {
      // Emit a change event when the keyup happens
      const {
        keyCode,
        altKey,
        ctrlKey,
        metaKey
      } = event;
      /* istanbul ignore if */
      if (this.disabled || this.readonly || altKey || ctrlKey || metaKey) {
        return;
      }
      if (arrayIncludes(KEY_CODES, keyCode)) {
        stopEvent(event, {
          propagation: false
        });
        this.resetTimers();
        this.$_keyIsDown = false;
        this.emitChange();
      }
    },
    handleStepRepeat(event, stepper) {
      const {
        type,
        button
      } = event || {};
      if (!this.disabled && !this.readonly) {
        /* istanbul ignore if */
        if (type === 'mousedown' && button) {
          // We only respond to left (main === 0) button clicks
          return;
        }
        this.resetTimers();
        // Step the counter initially
        stepper(1);
        const threshold = this.computedThreshold;
        const multiplier = this.computedStepMultiplier;
        const delay = this.computedDelay;
        const interval = this.computedInterval;
        // Initiate the delay/repeat interval
        this.$_autoDelayTimer = setTimeout(() => {
          let count = 0;
          this.$_autoRepeatTimer = setInterval(() => {
            // After N initial repeats, we increase the incrementing step amount
            // We do this to minimize screen reader announcements of the value
            // (values are announced every change, which can be chatty for SR users)
            // And to make it easer to select a value when the range is large
            stepper(count < threshold ? 1 : multiplier);
            count++;
          }, interval);
        }, delay);
      }
    },
    onMouseup(event) {
      // `<body>` listener, only enabled when mousedown starts
      const {
        type,
        button
      } = event || {};
      /* istanbul ignore if */
      if (type === 'mouseup' && button) {
        // Ignore non left button (main === 0) mouse button click
        return;
      }
      stopEvent(event, {
        propagation: false
      });
      this.resetTimers();
      this.setMouseup(false);
      // Trigger the change event
      this.emitChange();
    },
    setMouseup(on) {
      // Enable or disabled the body mouseup/touchend handlers
      // Use try/catch to handle case when called server side
      try {
        eventOnOff(on, document.body, 'mouseup', this.onMouseup, false);
        eventOnOff(on, document.body, 'touchend', this.onMouseup, false);
      } catch {}
    },
    resetTimers() {
      clearTimeout(this.$_autoDelayTimer);
      clearInterval(this.$_autoRepeatTimer);
      this.$_autoDelayTimer = null;
      this.$_autoRepeatTimer = null;
    },
    clearRepeat() {
      this.resetTimers();
      this.setMouseup(false);
      this.$_keyIsDown = false;
    }
  },
  render(h) {
    const {
      spinId,
      localValue: value,
      computedInline: inline,
      computedReadonly: readonly,
      vertical,
      disabled,
      computedFormatter
    } = this;
    const hasValue = !isNull(value);
    const makeButton = (stepper, label, IconCmp, keyRef, shortcut, btnDisabled, slotName) => {
      const $icon = h(IconCmp, {
        props: {
          scale: this.hasFocus ? 1.5 : 1.25
        },
        attrs: {
          'aria-hidden': 'true'
        }
      });
      const scope = {
        hasFocus: this.hasFocus
      };
      const handler = event => {
        if (!disabled && !readonly) {
          stopEvent(event, {
            propagation: false
          });
          this.setMouseup(true);
          // Since we `preventDefault()`, we must manually focus the button
          attemptFocus(event.currentTarget);
          this.handleStepRepeat(event, stepper);
        }
      };
      return h('button', {
        staticClass: 'btn btn-sm border-0 rounded-0',
        class: {
          'py-0': !vertical
        },
        attrs: {
          tabindex: '-1',
          type: 'button',
          disabled: disabled || readonly || btnDisabled,
          'aria-disabled': disabled || readonly || btnDisabled ? 'true' : null,
          'aria-controls': spinId,
          'aria-label': label || null,
          'aria-keyshortcuts': shortcut || null
        },
        on: {
          mousedown: handler,
          touchstart: handler
        },
        key: keyRef || null,
        ref: keyRef
      }, [this.normalizeSlot(slotName, scope) || $icon]);
    };
    // TODO: Add button disabled state when `wrap` is `false` and at value max/min
    const $increment = makeButton(this.stepUp, this.labelIncrement, BIconPlus, 'inc', 'ArrowUp', false, SLOT_NAME_INCREMENT);
    const $decrement = makeButton(this.stepDown, this.labelDecrement, BIconDash, 'dec', 'ArrowDown', false, SLOT_NAME_DECREMENT);
    let $hidden = h();
    if (this.name && !disabled) {
      $hidden = h('input', {
        attrs: {
          type: 'hidden',
          name: this.name,
          form: this.form || null,
          // TODO: Should this be set to '' if value is out of range?
          value: this.valueAsFixed
        },
        key: 'hidden'
      });
    }
    const $spin = h(
    // We use 'output' element to make this accept a `<label for="id">` (Except IE)
    'output', {
      staticClass: 'flex-grow-1',
      class: {
        'd-flex': vertical,
        'align-self-center': !vertical,
        'align-items-center': vertical,
        'border-top': vertical,
        'border-bottom': vertical,
        'border-left': !vertical,
        'border-right': !vertical
      },
      attrs: this.computedSpinAttrs,
      key: 'output',
      ref: 'spinner'
    }, [h('bdi', hasValue ? computedFormatter(value) : this.placeholder || '')]);
    return h('div', {
      staticClass: 'b-form-spinbutton form-control',
      class: [{
        disabled,
        readonly,
        focus: this.hasFocus,
        'd-inline-flex': inline || vertical,
        'd-flex': !inline && !vertical,
        'align-items-stretch': !vertical,
        'flex-column': vertical
      }, this.sizeFormClass, this.stateClass],
      attrs: this.computedAttrs,
      on: {
        keydown: this.onKeydown,
        keyup: this.onKeyup,
        // We use capture phase (`!` prefix) since focus and blur do not bubble
        '!focus': this.onFocusBlur,
        '!blur': this.onFocusBlur
      }
    }, vertical ? [$increment, $hidden, $spin, $decrement] : [$decrement, $hidden, $spin, $increment]);
  }
});

export { BFormSpinbutton, props };
