component StrongPassword {
  props {
    size = "default"
    color = "primary"
    label = "Password"
    name = "password"
    value = ""
    placeholder = "Create a strong password"
    autocomplete = "new-password"
    minLength = 8
    specialCharactersSet = "!@#$%^&*()_+-=[]{}|;:,.<>?"
    requireLowercase = true
    requireUppercase = true
    requireNumber = true
    requireSpecialCharacter = true
    showRequirements = true
    presentation = "inline"
    hintText = "Use a unique password you do not use elsewhere."
    emptyLabel = "Enter a password"
    weakLabel = "Weak"
    fairLabel = "Fair"
    goodLabel = "Good"
    strongLabel = "Strong"
    disabled = false
    readonly = false
    required = false
    invalid = false
    validationMessage = ""
    class = ""
    @event input = function
    @event change = function
    @event strength = function
  }

  state password = value
  state detailsOpen = false

  functions {
    function hasMinimumLength() {
      return password.length >= Number(minLength)
    }

    function hasLowercase() {
      return password !== password.toUpperCase()
    }

    function hasUppercase() {
      return password !== password.toLowerCase()
    }

    function hasNumber() {
      return containsCharacterAt("0123456789", 0)
    }

    function hasSpecialCharacter() {
      return containsCharacterAt(specialCharactersSet, 0)
    }

    function containsCharacterAt(characters, index) {
      if (index >= characters.length) {
        return false
      }
      if (password.includes(characters[index])) {
        return true
      }
      return containsCharacterAt(characters, index + 1)
    }

    function score() {
      return (hasMinimumLength() ? 1 : 0) + (requireLowercase && hasLowercase() ? 1 : 0) + (requireUppercase && hasUppercase() ? 1 : 0) + (requireNumber && hasNumber() ? 1 : 0) + (requireSpecialCharacter && hasSpecialCharacter() ? 1 : 0)
    }

    function maximumScore() {
      return 1 + (requireLowercase ? 1 : 0) + (requireUppercase ? 1 : 0) + (requireNumber ? 1 : 0) + (requireSpecialCharacter ? 1 : 0)
    }

    function strengthPercent() {
      return Math.round(score() / maximumScore() * 100)
    }

    function strengthLevel() {
      if (!password) {
        return "empty"
      }
      if (strengthPercent() <= 25) {
        return "weak"
      }
      if (strengthPercent() <= 50) {
        return "fair"
      }
      if (strengthPercent() < 100) {
        return "good"
      }
      return "strong"
    }

    function strengthLabel() {
      if (strengthLevel() === "weak") {
        return weakLabel
      }
      if (strengthLevel() === "fair") {
        return fairLabel
      }
      if (strengthLevel() === "good") {
        return goodLabel
      }
      if (strengthLevel() === "strong") {
        return strongLabel
      }
      return emptyLabel
    }

  }

  view {
    <div
      class="wire-next wire-next--color-{color} wire-next--size-{size} wire-next--strong-password wire-next--strong-password-{presentation} {invalid ? 'wire-next--invalid' : ''} {disabled ? 'wire-next--disabled' : ''} {class}"
      data-wrn-strong-password
      data-strength="{password ? strengthLevel() : 'empty'}"
      data-score="{password ? score() : 0}"
    >
      <label for="{name}-strong-password">{label}</label>
      <div class="wire-next__strong-password-anchor">
        <input
          {...attrs}
          id="{name}-strong-password"
          type="password"
          name="{name}"
          value="{password}"
          placeholder="{placeholder}"
          autocomplete="{autocomplete}"
          minlength="{minLength}"
          disabled="{disabled}"
          readonly="{readonly}"
          required="{required}"
          aria-invalid="{invalid ? 'true' : 'false'}"
          aria-describedby="{validationMessage ? name + '-validation' : hintText ? name + '-hint' : ''}"
          @focus="detailsOpen = true"
          @blur="detailsOpen = false"
          @input="password = event.target.value; $emit('input', { value: password, score: score(), maximumScore: maximumScore(), percent: strengthPercent(), level: strengthLevel() }); $emit('strength', { value: password, score: score(), maximumScore: maximumScore(), percent: strengthPercent(), level: strengthLevel() })"
          @change="$emit('change', { value: password, score: score(), maximumScore: maximumScore(), percent: strengthPercent(), level: strengthLevel() })"
        />

        {#if presentation === "popover"}
          <div
            class="wire-next__strong-password-popover"
            data-open="{detailsOpen ? 'true' : 'false'}"
            role="status"
          >
            <div class="wire-next__strong-password-popover-arrow" aria-hidden="true"></div>
            <div class="wire-next__strong-password-details">
              <div class="wire-next__strong-password-summary">
                <span>Password strength</span>
                <strong>{password ? strengthLabel() : emptyLabel}</strong>
              </div>
              <div
                class="wire-next__strong-password-meter"
                role="progressbar"
                aria-label="Password strength"
                aria-valuemin="0"
                aria-valuemax="100"
                aria-valuenow="{password ? strengthPercent() : 0}"
              >
                <span style="width: {password ? strengthPercent() : 0}%"></span>
              </div>
              {#if showRequirements}
                <ul class="wire-next__strong-password-requirements">
                  <li data-met="{password && hasMinimumLength() ? 'true' : 'false'}">
                    <span aria-hidden="true"></span>At least {minLength} characters
                  </li>
                  {#if requireLowercase}<li data-met="{password && hasLowercase() ? 'true' : 'false'}"><span aria-hidden="true"></span>One lowercase letter</li>{/if}
                  {#if requireUppercase}<li data-met="{password && hasUppercase() ? 'true' : 'false'}"><span aria-hidden="true"></span>One uppercase letter</li>{/if}
                  {#if requireNumber}<li data-met="{password && hasNumber() ? 'true' : 'false'}"><span aria-hidden="true"></span>One number</li>{/if}
                  {#if requireSpecialCharacter}<li data-met="{password && hasSpecialCharacter() ? 'true' : 'false'}"><span aria-hidden="true"></span>One special character: {specialCharactersSet}</li>{/if}
                </ul>
              {/if}
              {#if hintText}<small id="{name}-hint">{hintText}</small>{/if}
            </div>
          </div>
        {/if}
      </div>

      {#if presentation !== "popover"}
        <div class="wire-next__strong-password-details">
          <div class="wire-next__strong-password-summary">
            <span>Password strength</span>
            <strong>{password ? strengthLabel() : emptyLabel}</strong>
          </div>
          <div
            class="wire-next__strong-password-meter"
            role="progressbar"
            aria-label="Password strength"
            aria-valuemin="0"
            aria-valuemax="100"
            aria-valuenow="{password ? strengthPercent() : 0}"
          >
            <span style="width: {password ? strengthPercent() : 0}%"></span>
          </div>
          {#if showRequirements}
            <ul class="wire-next__strong-password-requirements">
              <li data-met="{password && hasMinimumLength() ? 'true' : 'false'}"><span aria-hidden="true"></span>At least {minLength} characters</li>
              {#if requireLowercase}<li data-met="{password && hasLowercase() ? 'true' : 'false'}"><span aria-hidden="true"></span>One lowercase letter</li>{/if}
              {#if requireUppercase}<li data-met="{password && hasUppercase() ? 'true' : 'false'}"><span aria-hidden="true"></span>One uppercase letter</li>{/if}
              {#if requireNumber}<li data-met="{password && hasNumber() ? 'true' : 'false'}"><span aria-hidden="true"></span>One number</li>{/if}
              {#if requireSpecialCharacter}<li data-met="{password && hasSpecialCharacter() ? 'true' : 'false'}"><span aria-hidden="true"></span>One special character: {specialCharactersSet}</li>{/if}
            </ul>
          {/if}
          {#if hintText}<small id="{name}-hint">{hintText}</small>{/if}
        </div>
      {/if}

      <small id="{name}-validation" class="wire-next__validation" data-error="{name}">{validationMessage}</small>
    </div>
  }
}