import { ReactNode, useState } from 'react'
import { formatDateForDisplay } from '@/utils/dates'
import { useTranslation } from '@/i18n'
import type { DayOverride, DayOverrideCreateRequest } from '@/types'

export interface DayOverridesInputProps {
  overrides: DayOverride[]
  isLoading?: boolean
  onAdd: (req: DayOverrideCreateRequest) => Promise<void>
  onRemove: (id: string) => Promise<void>
  workspaceId: string
}

export function DayOverridesInput({
  overrides,
  isLoading = false,
  onAdd,
  onRemove,
  workspaceId,
}: DayOverridesInputProps): ReactNode {
  const { t, locale } = useTranslation()
  const [date, setDate] = useState('')
  const [isWorkingDay, setIsWorkingDay] = useState(true)
  const [note, setNote] = useState('')
  const [isSubmitting, setIsSubmitting] = useState(false)

  const handleAddOverride = async (e: React.FormEvent) => {
    e.preventDefault()
    if (!date) return

    try {
      setIsSubmitting(true)
      await onAdd({
        workspaceId,
        date,
        isWorkingDay,
        note: note || null,
      })
      setDate('')
      setIsWorkingDay(true)
      setNote('')
    } finally {
      setIsSubmitting(false)
    }
  }

  const handleRemove = async (id: string) => {
    try {
      await onRemove(id)
    } catch {
      // Error handling is done in parent
    }
  }

  const sortedOverrides = [...overrides].sort((a, b) => new Date(a.date).getTime() - new Date(b.date).getTime())

  return (
    <div data-testid="day-overrides-input" className="day-overrides-input">
      {overrides.length === 0 ? (
        <div className="day-overrides-input__empty">
          <p>{t('dayOverridesInput.empty')}</p>
        </div>
      ) : (
        <div className="day-overrides-input__list">
          <ul className="day-overrides-input__items">
            {sortedOverrides.map((override) => (
              <li key={override.id} className="day-overrides-input__item" data-testid={`override-item-${override.id}`}>
                <div className="day-overrides-input__item-header">
                  <div className="day-overrides-input__item-date">
                    <strong>{formatDateForDisplay(override.date, locale)}</strong>
                  </div>
                  <div className="day-overrides-input__item-status">
                    <span className={`day-overrides-input__status day-overrides-input__status--${override.isWorkingDay ? 'working' : 'off'}`}>
                      {override.isWorkingDay ? t('dayOverridesInput.workingStatus') : t('dayOverridesInput.offStatus')}
                    </span>
                  </div>
                </div>
                {override.note && (
                  <div className="day-overrides-input__item-note">
                    {t('dayOverridesInput.noteLabel', { note: override.note })}
                  </div>
                )}
                <button
                  type="button"
                  onClick={() => handleRemove(override.id)}
                  disabled={isSubmitting || isLoading}
                  className="btn btn--danger btn--sm btn--block"
                  data-testid={`remove-override-${override.id}`}
                >
                  {t('common.delete')}
                </button>
              </li>
            ))}
          </ul>
        </div>
      )}

      <form onSubmit={handleAddOverride} className="day-overrides-input__form" data-testid="add-override-form">
        <h3>{t('dayOverridesInput.addSectionTitle')}</h3>

        <div className="field day-overrides-input__form-group">
          <label htmlFor="override-date" className="field__label">
            {t('dayOverridesInput.dateLabel')}
          </label>
          <input
            id="override-date"
            type="date"
            value={date}
            onChange={(e) => setDate(e.target.value)}
            required
            disabled={isSubmitting || isLoading}
            data-testid="override-date-input"
            className="field__control"
          />
        </div>

        <div className="day-overrides-input__form-group">
          <fieldset className="day-overrides-input__radio-group">
            <legend>{t('dayOverridesInput.statusLegend')}</legend>
            <label className="day-overrides-input__radio-label">
              <input
                type="radio"
                name="status"
                value="working"
                checked={isWorkingDay}
                onChange={() => setIsWorkingDay(true)}
                disabled={isSubmitting || isLoading}
                data-testid="override-working-radio"
              />
              <span>{t('dayOverridesInput.workingStatus')}</span>
            </label>
            <label className="day-overrides-input__radio-label">
              <input
                type="radio"
                name="status"
                value="off"
                checked={!isWorkingDay}
                onChange={() => setIsWorkingDay(false)}
                disabled={isSubmitting || isLoading}
                data-testid="override-off-radio"
              />
              <span>{t('dayOverridesInput.offStatus')}</span>
            </label>
          </fieldset>
        </div>

        <div className="field day-overrides-input__form-group">
          <label htmlFor="override-note" className="field__label">
            {t('dayOverridesInput.noteFieldLabel')}
          </label>
          <input
            id="override-note"
            type="text"
            placeholder={t('dayOverridesInput.notePlaceholder')}
            value={note}
            onChange={(e) => setNote(e.target.value)}
            maxLength={280}
            disabled={isSubmitting || isLoading}
            data-testid="override-note-input"
            className="field__control"
          />
          <small className="day-overrides-input__char-count">
            {t('dayOverridesInput.charCount', { count: note.length })}
          </small>
        </div>

        <button
          type="submit"
          disabled={isSubmitting || isLoading || !date}
          className="btn btn--primary btn--block"
          data-testid="add-override-button"
        >
          {isSubmitting ? t('dayOverridesInput.addingButton') : t('dayOverridesInput.addButton')}
        </button>
      </form>
    </div>
  )
}