/**
 * Alpine.js Widget Components for Schema Forms
 *
 * Centralized widget component definitions for dynamic form rendering.
 * Each widget receives explicit parameters instead of context object for better traceability.
 */
document.addEventListener('alpine:init', () => {
  // Base widget factory with common functionality
  const baseWidget = (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    fieldName,
    data,
    schema,
    uiSchema,
    fieldErrors,
    mode,

    // Field schema access
    get fieldSchema() {
      return this.schema?.properties?.[this.fieldName] || {};
    },

    // Common metadata
    get label() {
      // Check uiSchema first (RJSF format)
      if (this.uiSchema?.[this.fieldName]?.['ui:label']) {
        return this.uiSchema[this.fieldName]['ui:label'];
      }
      // Fall back to schema title
      if (this.fieldSchema.title) {
        return this.fieldSchema.title;
      }
      // Default: format field name
      return this.fieldName.replace(/_/g, ' ').replace(/\b\w/g, c => c.toUpperCase());
    },
    get helpText() {
      return this.fieldSchema.description || '';
    },

    // Field-level unit extraction from uiSchema (RJSF format)
    get unit() {
      return this.uiSchema?.[this.fieldName]?.['ui:unit'] || null;
    },

    // Error handling
    get hasError() {
      return !!this.fieldErrors?.[this.fieldName];
    },
    get errors() {
      return this.fieldErrors?.[this.fieldName] || [];
    },

    // Mode checks
    get isViewMode() { return this.mode === 'view'; },
    get isEditMode() { return this.mode === 'edit'; },
  });

  // Text widget
  Alpine.data('textWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName] || ''; },
    set value(v) { this.data[this.fieldName] = v; },
  }));

  // Textarea widget
  Alpine.data('textareaWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName] || ''; },
    set value(v) { this.data[this.fieldName] = v; },
  }));

  // Number widget with unit support
  Alpine.data('numberWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName]; },
    set value(v) {
      this.data[this.fieldName] = v === '' || v === null ? null : parseFloat(v);
    },
    get hasValue() {
      return this.value !== null && this.value !== undefined && this.value !== '';
    },
    // Format value with unit for view mode
    get displayValue() {
      if (!this.hasValue) return '—';
      return this.unit ? `${this.value} ${this.unit}` : String(this.value);
    },
  }));

  // Select widget
  Alpine.data('selectWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName] || ''; },
    set value(v) { this.data[this.fieldName] = v; },
    get options() { return this.fieldSchema.enum || []; },
  }));

  // Checkbox widget
  Alpine.data('checkboxWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get checked() { return !!this.data[this.fieldName]; },
    set checked(v) { this.data[this.fieldName] = v; },
  }));

  // Interval widget with unit support
  Alpine.data('intervalWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get start() {
      return this.data[this.fieldName]?.start ?? null;
    },
    set start(v) {
      if (!this.data[this.fieldName]) this.data[this.fieldName] = {};
      this.data[this.fieldName].start = v === '' || v === null ? null : parseFloat(v);
    },
    get end() {
      return this.data[this.fieldName]?.end ?? null;
    },
    set end(v) {
      if (!this.data[this.fieldName]) this.data[this.fieldName] = {};
      this.data[this.fieldName].end = v === '' || v === null ? null : parseFloat(v);
    },
    // Format interval with unit for view mode
    get displayValue() {
      const s = this.start, e = this.end;
      const unitStr = this.unit ? ` ${this.unit}` : '';

      if (s !== null && e !== null) return `${s} – ${e}${unitStr}`;
      if (s !== null) return `≥ ${s}${unitStr}`;
      if (e !== null) return `≤ ${e}${unitStr}`;
      return '—';
    },

    get isSameValue() {
      return this.start !== null && this.start === this.end;
    },

    // Validation: start must be <= end
    get hasValidationError() {
      if (this.isViewMode) return false;
      const s = this.start;
      const e = this.end;
      // Only validate if both values are provided
      if (s !== null && e !== null && typeof s === 'number' && typeof e === 'number') {
        return s > e;
      }
      return false;
    },

    // Override hasError to include validation error
    get hasError() {
      return this.hasValidationError || !!this.fieldErrors?.[this.fieldName];
    },

    // Override errors to include validation error message
    get errors() {
      const serverErrors = this.fieldErrors?.[this.fieldName] || [];
      const validationErrors = this.hasValidationError
        ? ['Start value must be less than or equal to end value']
        : [];
      return [...validationErrors, ...serverErrors];
    },
  }));

  // PubMed link widget
  Alpine.data('pubmedWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName] || ''; },
    set value(v) { this.data[this.fieldName] = v; },
    get pubmedUrl() {
      return this.value ? `https://pubmed.ncbi.nlm.nih.gov/${this.value}` : null;
    },
  }));

  // Compound link widget
  Alpine.data('compoundWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),

    get value() { return this.data[this.fieldName] || ''; },
    set value(v) { this.data[this.fieldName] = v; },
  }));
});