import { extend, REF_FOR_KEY } from '../../vue';
import { NAME_TIME } from '../../constants/components';
import { EVENT_NAME_CONTEXT } from '../../constants/events';
import { CODE_LEFT, CODE_RIGHT } from '../../constants/key-codes';
import { PROP_TYPE_STRING, PROP_TYPE_BOOLEAN, PROP_TYPE_ARRAY_STRING, PROP_TYPE_NUMBER_STRING } from '../../constants/props';
import { RX_TIME } from '../../constants/regex';
import { concat } from '../../utils/array';
import { createDateFormatter, createDate } from '../../utils/date';
import { attemptFocus, getActiveElement, contains, attemptBlur, requestAF } from '../../utils/dom';
import { stopEvent } from '../../utils/events';
import { identity } from '../../utils/identity';
import { isUndefinedOrNull, isNull } from '../../utils/inspect';
import { looseEqual } from '../../utils/loose-equal';
import { isLocaleRTL } from '../../utils/locale';
import { makeModelMixin } from '../../utils/model';
import { toInteger } from '../../utils/number';
import { sortKeys, pick } from '../../utils/object';
import { makePropsConfigurable, makeProp } from '../../utils/props';
import { toString } from '../../utils/string';
import { props as props$1, idMixin } from '../../mixins/id';
import { normalizeSlotMixin } from '../../mixins/normalize-slot';
import { props as props$2, BFormSpinbutton } from '../form-spinbutton/form-spinbutton';
import { BIconChevronUp, BIconCircleFill } from '../../icons/icons';

// BTime control (not form input control)

// --- Constants ---

const {
  mixin: modelMixin,
  props: modelProps,
  prop: MODEL_PROP_NAME,
  event: MODEL_EVENT_NAME
} = makeModelMixin('value', {
  type: PROP_TYPE_STRING,
  defaultValue: ''
});
const NUMERIC = 'numeric';

// --- Helper methods ---

const padLeftZeros = value => `00${value || ''}`.slice(-2);
const parseHMS = value => {
  value = toString(value);
  let [hh, mm, ss] = [null, null, null];
  if (RX_TIME.test(value)) {
    [hh, mm, ss] = value.split(':').map(v => toInteger(v, null));
  }
  return {
    hours: isUndefinedOrNull(hh) ? null : hh,
    minutes: isUndefinedOrNull(mm) ? null : mm,
    seconds: isUndefinedOrNull(ss) ? null : ss,
    ampm: isUndefinedOrNull(hh) || hh < 12 ? 0 : 1
  };
};
const formatHMS = function (_ref) {
  let {
    hours,
    minutes,
    seconds
  } = _ref;
  let requireSeconds = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  if (isNull(hours) || isNull(minutes) || requireSeconds && isNull(seconds)) {
    return '';
  }
  const hms = [hours, minutes, requireSeconds ? seconds : 0];
  return hms.map(padLeftZeros).join(':');
};

// --- Props ---

const props = makePropsConfigurable(sortKeys({
  ...props$1,
  ...modelProps,
  ...pick(props$2, ['labelIncrement', 'labelDecrement']),
  // ID of label element
  ariaLabelledby: makeProp(PROP_TYPE_STRING),
  disabled: makeProp(PROP_TYPE_BOOLEAN, false),
  footerTag: makeProp(PROP_TYPE_STRING, 'footer'),
  headerTag: makeProp(PROP_TYPE_STRING, 'header'),
  hidden: makeProp(PROP_TYPE_BOOLEAN, false),
  hideHeader: makeProp(PROP_TYPE_BOOLEAN, false),
  // Explicitly force 12 or 24 hour time
  // Default is to use resolved locale for 12/24 hour display
  // Tri-state: `true` = 12, `false` = 24, `null` = auto
  hour12: makeProp(PROP_TYPE_BOOLEAN, null),
  labelAm: makeProp(PROP_TYPE_STRING, 'AM'),
  labelAmpm: makeProp(PROP_TYPE_STRING, 'AM/PM'),
  labelHours: makeProp(PROP_TYPE_STRING, 'Hours'),
  labelMinutes: makeProp(PROP_TYPE_STRING, 'Minutes'),
  labelNoTimeSelected: makeProp(PROP_TYPE_STRING, 'No time selected'),
  labelPm: makeProp(PROP_TYPE_STRING, 'PM'),
  labelSeconds: makeProp(PROP_TYPE_STRING, 'Seconds'),
  labelSelected: makeProp(PROP_TYPE_STRING, 'Selected time'),
  locale: makeProp(PROP_TYPE_ARRAY_STRING),
  minutesStep: makeProp(PROP_TYPE_NUMBER_STRING, 1),
  readonly: makeProp(PROP_TYPE_BOOLEAN, false),
  secondsStep: makeProp(PROP_TYPE_NUMBER_STRING, 1),
  // If `true`, show the second spinbutton
  showSeconds: makeProp(PROP_TYPE_BOOLEAN, false)
}), NAME_TIME);

// --- Main component ---

// @vue/component
const BTime = /*#__PURE__*/extend({
  name: NAME_TIME,
  mixins: [idMixin, modelMixin, normalizeSlotMixin],
  props,
  data() {
    const parsed = parseHMS(this[MODEL_PROP_NAME] || '');
    return {
      // Spin button models
      modelHours: parsed.hours,
      modelMinutes: parsed.minutes,
      modelSeconds: parsed.seconds,
      modelAmpm: parsed.ampm,
      // Internal flag to enable aria-live regions
      isLive: false
    };
  },
  computed: {
    computedHMS() {
      const hours = this.modelHours;
      const minutes = this.modelMinutes;
      const seconds = this.modelSeconds;
      return formatHMS({
        hours,
        minutes,
        seconds
      }, this.showSeconds);
    },
    resolvedOptions() {
      // Resolved locale options
      const locale = concat(this.locale).filter(identity);
      const options = {
        hour: NUMERIC,
        minute: NUMERIC,
        second: NUMERIC
      };
      if (!isUndefinedOrNull(this.hour12)) {
        // Force 12 or 24 hour clock
        options.hour12 = !!this.hour12;
      }
      const dtf = new Intl.DateTimeFormat(locale, options);
      const resolved = dtf.resolvedOptions();
      const hour12 = resolved.hour12 || false;
      // IE 11 doesn't resolve the hourCycle, so we make
      // an assumption and fall back to common values
      const hourCycle = resolved.hourCycle || (hour12 ? 'h12' : 'h23');
      return {
        locale: resolved.locale,
        hour12,
        hourCycle
      };
    },
    computedLocale() {
      return this.resolvedOptions.locale;
    },
    computedLang() {
      return (this.computedLocale || '').replace(/-u-.*$/, '');
    },
    computedRTL() {
      return isLocaleRTL(this.computedLang);
    },
    computedHourCycle() {
      // h11, h12, h23, or h24
      // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Locale/hourCycle
      // h12 - Hour system using 1–12. Corresponds to 'h' in patterns. The 12 hour clock, with midnight starting at 12:00 am
      // h23 - Hour system using 0–23. Corresponds to 'H' in patterns. The 24 hour clock, with midnight starting at 0:00
      // h11 - Hour system using 0–11. Corresponds to 'K' in patterns. The 12 hour clock, with midnight starting at 0:00 am
      // h24 - Hour system using 1–24. Corresponds to 'k' in pattern. The 24 hour clock, with midnight starting at 24:00
      // For h12 or h24, we visually format 00 hours as 12
      return this.resolvedOptions.hourCycle;
    },
    is12Hour() {
      return !!this.resolvedOptions.hour12;
    },
    context() {
      return {
        locale: this.computedLocale,
        isRTL: this.computedRTL,
        hourCycle: this.computedHourCycle,
        hour12: this.is12Hour,
        hours: this.modelHours,
        minutes: this.modelMinutes,
        seconds: this.showSeconds ? this.modelSeconds : 0,
        value: this.computedHMS,
        formatted: this.formattedTimeString
      };
    },
    valueId() {
      return this.safeId() || null;
    },
    computedAriaLabelledby() {
      return [this.ariaLabelledby, this.valueId].filter(identity).join(' ') || null;
    },
    timeFormatter() {
      // Returns a formatter function reference
      // The formatter converts the time to a localized string
      const options = {
        hour12: this.is12Hour,
        hourCycle: this.computedHourCycle,
        hour: NUMERIC,
        minute: NUMERIC,
        timeZone: 'UTC'
      };
      if (this.showSeconds) {
        options.second = NUMERIC;
      }
      // Formats the time as a localized string
      return createDateFormatter(this.computedLocale, options);
    },
    numberFormatter() {
      // Returns a formatter function reference
      // The formatter always formats as 2 digits and is localized
      const nf = new Intl.NumberFormat(this.computedLocale, {
        style: 'decimal',
        minimumIntegerDigits: 2,
        minimumFractionDigits: 0,
        maximumFractionDigits: 0,
        notation: 'standard'
      });
      return nf.format;
    },
    formattedTimeString() {
      const hours = this.modelHours;
      const minutes = this.modelMinutes;
      const seconds = this.showSeconds ? this.modelSeconds || 0 : 0;
      if (this.computedHMS) {
        return this.timeFormatter(createDate(Date.UTC(0, 0, 1, hours, minutes, seconds)));
      }
      return this.labelNoTimeSelected || ' ';
    },
    spinScopedSlots() {
      const h = this.$createElement;
      return {
        increment: _ref2 => {
          let {
            hasFocus
          } = _ref2;
          return h(BIconChevronUp, {
            props: {
              scale: hasFocus ? 1.5 : 1.25
            },
            attrs: {
              'aria-hidden': 'true'
            }
          });
        },
        decrement: _ref3 => {
          let {
            hasFocus
          } = _ref3;
          return h(BIconChevronUp, {
            props: {
              flipV: true,
              scale: hasFocus ? 1.5 : 1.25
            },
            attrs: {
              'aria-hidden': 'true'
            }
          });
        }
      };
    }
  },
  watch: {
    [MODEL_PROP_NAME](newValue, oldValue) {
      if (newValue !== oldValue && !looseEqual(parseHMS(newValue), parseHMS(this.computedHMS))) {
        const {
          hours,
          minutes,
          seconds,
          ampm
        } = parseHMS(newValue);
        this.modelHours = hours;
        this.modelMinutes = minutes;
        this.modelSeconds = seconds;
        this.modelAmpm = ampm;
      }
    },
    computedHMS(newValue, oldValue) {
      if (newValue !== oldValue) {
        this.$emit(MODEL_EVENT_NAME, newValue);
      }
    },
    context(newValue, oldValue) {
      if (!looseEqual(newValue, oldValue)) {
        this.$emit(EVENT_NAME_CONTEXT, newValue);
      }
    },
    modelAmpm(newValue, oldValue) {
      if (newValue !== oldValue) {
        const hours = isNull(this.modelHours) ? 0 : this.modelHours;
        this.$nextTick(() => {
          if (newValue === 0 && hours > 11) {
            // Switched to AM
            this.modelHours = hours - 12;
          } else if (newValue === 1 && hours < 12) {
            // Switched to PM
            this.modelHours = hours + 12;
          }
        });
      }
    },
    modelHours(newHours, oldHours) {
      if (newHours !== oldHours) {
        this.modelAmpm = newHours > 11 ? 1 : 0;
      }
    }
  },
  created() {
    this.$nextTick(() => {
      this.$emit(EVENT_NAME_CONTEXT, this.context);
    });
  },
  mounted() {
    this.setLive(true);
  },
  /* istanbul ignore next */
  activated() {
    this.setLive(true);
  },
  /* istanbul ignore next */
  deactivated() {
    this.setLive(false);
  },
  beforeDestroy() {
    this.setLive(false);
  },
  methods: {
    // Public methods
    focus() {
      if (!this.disabled) {
        // We focus the first spin button
        attemptFocus(this.$refs.spinners[0]);
      }
    },
    blur() {
      if (!this.disabled) {
        const activeElement = getActiveElement();
        if (contains(this.$el, activeElement)) {
          attemptBlur(activeElement);
        }
      }
    },
    // Formatters for the spin buttons
    formatHours(hh) {
      const hourCycle = this.computedHourCycle;
      // We always store 0-23, but format based on h11/h12/h23/h24 formats
      hh = this.is12Hour && hh > 12 ? hh - 12 : hh;
      // Determine how 00:00 and 12:00 are shown
      hh = hh === 0 && hourCycle === 'h12' ? 12 : hh === 0 && hourCycle === 'h24' ? /* istanbul ignore next */24 : hh === 12 && hourCycle === 'h11' ? /* istanbul ignore next */0 : hh;
      return this.numberFormatter(hh);
    },
    formatMinutes(mm) {
      return this.numberFormatter(mm);
    },
    formatSeconds(ss) {
      return this.numberFormatter(ss);
    },
    formatAmpm(ampm) {
      // These should come from label props???
      // `ampm` should always be a value of `0` or `1`
      return ampm === 0 ? this.labelAm : ampm === 1 ? this.labelPm : '';
    },
    // Spinbutton on change handlers
    setHours(value) {
      this.modelHours = value;
    },
    setMinutes(value) {
      this.modelMinutes = value;
    },
    setSeconds(value) {
      this.modelSeconds = value;
    },
    setAmpm(value) {
      this.modelAmpm = value;
    },
    onSpinLeftRight() {
      let event = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
      const {
        type,
        keyCode
      } = event;
      if (!this.disabled && type === 'keydown' && (keyCode === CODE_LEFT || keyCode === CODE_RIGHT)) {
        stopEvent(event);
        const spinners = this.$refs.spinners || [];
        let index = spinners.map(cmp => !!cmp.hasFocus).indexOf(true);
        index = index + (keyCode === CODE_LEFT ? -1 : 1);
        index = index >= spinners.length ? 0 : index < 0 ? spinners.length - 1 : index;
        attemptFocus(spinners[index]);
      }
    },
    setLive(on) {
      if (on) {
        this.$nextTick(() => {
          requestAF(() => {
            this.isLive = true;
          });
        });
      } else {
        this.isLive = false;
      }
    }
  },
  render(h) {
    var _this = this;
    // If hidden, we just render a placeholder comment
    /* istanbul ignore if */
    if (this.hidden) {
      return h();
    }
    const {
      disabled,
      readonly,
      computedLocale: locale,
      computedAriaLabelledby: ariaLabelledby,
      labelIncrement,
      labelDecrement,
      valueId,
      focus: focusHandler
    } = this;
    const spinIds = [];

    // Helper method to render a spinbutton
    const makeSpinbutton = function (handler, key, classes) {
      let spinbuttonProps = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
      const id = _this.safeId(`_spinbutton_${key}_`) || null;
      spinIds.push(id);
      return h(BFormSpinbutton, {
        class: classes,
        props: {
          id,
          placeholder: '--',
          vertical: true,
          required: true,
          disabled,
          readonly,
          locale,
          labelIncrement,
          labelDecrement,
          wrap: true,
          ariaControls: valueId,
          min: 0,
          ...spinbuttonProps
        },
        scopedSlots: _this.spinScopedSlots,
        on: {
          // We use `change` event to minimize SR verbosity
          // As the spinbutton will announce each value change
          // and we don't want the formatted time to be announced
          // on each value input if repeat is happening
          change: handler
        },
        key,
        ref: 'spinners',
        [REF_FOR_KEY]: true
      });
    };

    // Helper method to return a "colon" separator
    const makeColon = () => {
      return h('div', {
        staticClass: 'd-flex flex-column',
        class: {
          'text-muted': disabled || readonly
        },
        attrs: {
          'aria-hidden': 'true'
        }
      }, [h(BIconCircleFill, {
        props: {
          shiftV: 4,
          scale: 0.5
        }
      }), h(BIconCircleFill, {
        props: {
          shiftV: -4,
          scale: 0.5
        }
      })]);
    };
    let $spinners = [];

    // Hours
    $spinners.push(makeSpinbutton(this.setHours, 'hours', 'b-time-hours', {
      value: this.modelHours,
      max: 23,
      step: 1,
      formatterFn: this.formatHours,
      ariaLabel: this.labelHours
    }));

    // Spacer
    $spinners.push(makeColon());

    // Minutes
    $spinners.push(makeSpinbutton(this.setMinutes, 'minutes', 'b-time-minutes', {
      value: this.modelMinutes,
      max: 59,
      step: this.minutesStep || 1,
      formatterFn: this.formatMinutes,
      ariaLabel: this.labelMinutes
    }));
    if (this.showSeconds) {
      // Spacer
      $spinners.push(makeColon());
      // Seconds
      $spinners.push(makeSpinbutton(this.setSeconds, 'seconds', 'b-time-seconds', {
        value: this.modelSeconds,
        max: 59,
        step: this.secondsStep || 1,
        formatterFn: this.formatSeconds,
        ariaLabel: this.labelSeconds
      }));
    }

    // AM/PM ?
    // depends on client settings, shouldn't be rendered on server
    if (this.isLive && this.is12Hour) {
      // TODO:
      //   If locale is RTL, unshift this instead of push?
      //   And switch class `ml-2` to `mr-2`
      //   Note some LTR locales (i.e. zh) also place AM/PM to the left
      $spinners.push(makeSpinbutton(this.setAmpm, 'ampm', 'b-time-ampm', {
        value: this.modelAmpm,
        max: 1,
        formatterFn: this.formatAmpm,
        ariaLabel: this.labelAmpm,
        // We set `required` as `false`, since this always has a value
        required: false
      }));
    }

    // Assemble spinners
    $spinners = h('div', {
      staticClass: 'd-flex align-items-center justify-content-center mx-auto',
      attrs: {
        role: 'group',
        tabindex: disabled || readonly ? null : '-1',
        'aria-labelledby': ariaLabelledby
      },
      on: {
        keydown: this.onSpinLeftRight,
        click: /* istanbul ignore next */event => {
          if (event.target === event.currentTarget) {
            focusHandler();
          }
        }
      }
    }, $spinners);

    // Selected type display
    const $value = h('output', {
      staticClass: 'form-control form-control-sm text-center',
      class: {
        disabled: disabled || readonly
      },
      attrs: {
        id: valueId,
        role: 'status',
        for: spinIds.filter(identity).join(' ') || null,
        tabindex: disabled ? null : '-1',
        'aria-live': this.isLive ? 'polite' : 'off',
        'aria-atomic': 'true'
      },
      on: {
        // Transfer focus/click to focus hours spinner
        click: focusHandler,
        focus: focusHandler
      }
    }, [h('bdi', this.formattedTimeString), this.computedHMS ? h('span', {
      staticClass: 'sr-only'
    }, ` (${this.labelSelected}) `) : '']);
    const $header = h(this.headerTag, {
      staticClass: 'b-time-header',
      class: {
        'sr-only': this.hideHeader
      }
    }, [$value]);
    const $content = this.normalizeSlot();
    const $footer = $content ? h(this.footerTag, {
      staticClass: 'b-time-footer'
    }, $content) : h();
    return h('div', {
      staticClass: 'b-time d-inline-flex flex-column text-center',
      attrs: {
        role: 'group',
        lang: this.computedLang || null,
        'aria-labelledby': ariaLabelledby || null,
        'aria-disabled': disabled ? 'true' : null,
        'aria-readonly': readonly && !disabled ? 'true' : null
      }
    }, [$header, $spinners, $footer]);
  }
});

export { BTime, props };
