import { CSSProperties } from 'react';
import { escapeHtml, escapeAttr, safeUrl, cssValue } from '../../utils/escape';

export type CtaVariant = 'primary' | 'outline' | 'ghost';

export interface CtaButton {
  text: string;
  href: string;
  variant?: CtaVariant;
  target?: '_blank';
}

export interface CtaStyleDefaults {
  primaryBg: string;
  primaryText: string;
  outlineText: string;
}

/**
 * Read the effective list of CTAs for a section, falling back to legacy
 * primary/secondary props when ctas[] is absent. New sections write ctas[]
 * directly; old sections keep rendering until the user touches the settings.
 */
export function normalizeCtas(props: {
  ctas?: CtaButton[];
  buttonText?: string;
  buttonHref?: string;
  secondaryButtonText?: string;
  secondaryButtonHref?: string;
}): CtaButton[] {
  if (Array.isArray(props.ctas) && props.ctas.length > 0) {
    return props.ctas.filter((c) => c && (c.text || c.href));
  }
  const legacy: CtaButton[] = [];
  if (props.buttonText) legacy.push({ text: props.buttonText, href: props.buttonHref || '#', variant: 'primary' });
  if (props.secondaryButtonText) legacy.push({ text: props.secondaryButtonText, href: props.secondaryButtonHref || '#', variant: 'outline' });
  return legacy;
}

export function ctaInlineStyle(cta: CtaButton, defaults: CtaStyleDefaults): CSSProperties {
  const variant = cta.variant || 'primary';
  switch (variant) {
    case 'outline':
      return {
        display: 'inline-block', padding: '14px 36px',
        backgroundColor: 'transparent', color: defaults.outlineText,
        textDecoration: 'none', borderRadius: '8px',
        fontWeight: 600, fontSize: '16px',
        border: `2px solid ${defaults.outlineText}`,
      };
    case 'ghost':
      return {
        display: 'inline-block', padding: '14px 24px',
        backgroundColor: 'transparent', color: defaults.outlineText,
        textDecoration: 'underline', borderRadius: '8px',
        fontWeight: 600, fontSize: '16px',
      };
    case 'primary':
    default:
      return {
        display: 'inline-block', padding: '14px 36px',
        backgroundColor: defaults.primaryBg, color: defaults.primaryText,
        textDecoration: 'none', borderRadius: '8px',
        fontWeight: 600, fontSize: '16px',
      };
  }
}

export function ctaCssString(cta: CtaButton, defaults: CtaStyleDefaults): string {
  const variant = cta.variant || 'primary';
  // Sanitized -- these are raw string-interpolation sinks into style="...".
  // Callers pass user-controlled design-token colors (e.g. HeroSimple's
  // buttonBgColor/buttonTextColor/textColor) through CtaStyleDefaults, so
  // sanitize once here rather than at every call site.
  const outlineText = cssValue(defaults.outlineText) || '#000000';
  const primaryBg = cssValue(defaults.primaryBg) || '#000000';
  const primaryText = cssValue(defaults.primaryText) || '#ffffff';
  switch (variant) {
    case 'outline':
      return `display:inline-block;padding:14px 36px;background-color:transparent;color:${outlineText};text-decoration:none;border-radius:8px;font-weight:600;font-size:16px;border:2px solid ${outlineText}`;
    case 'ghost':
      return `display:inline-block;padding:14px 24px;background-color:transparent;color:${outlineText};text-decoration:underline;border-radius:8px;font-weight:600;font-size:16px`;
    case 'primary':
    default:
      return `display:inline-block;padding:14px 36px;background-color:${primaryBg};color:${primaryText};text-decoration:none;border-radius:8px;font-weight:600;font-size:16px`;
  }
}

export function ctasToHtml(ctas: CtaButton[], defaults: CtaStyleDefaults): string {
  return ctas.map((c) => {
    const target = c.target === '_blank' ? ' target="_blank" rel="noopener noreferrer"' : '';
    return `<a href="${escapeAttr(safeUrl(c.href || '#'))}"${target} style="${ctaCssString(c, defaults)}">${escapeHtml(c.text || '')}</a>`;
  }).join('');
}