"use client";

import { createContext, useContext, useEffect, useMemo, type ReactNode } from "react";

export type ExperienceBrandTokens = {
  accent?: string;
  accentSoft?: string;
  success?: string;
  warning?: string;
  danger?: string;
};

export type ExperienceDirection = "rtl" | "ltr";

type ThemeContextValue = {
  direction: ExperienceDirection;
  brand: ExperienceBrandTokens;
  tenantThemeId?: string | null;
};

const ExperienceThemeContext = createContext<ThemeContextValue>({
  direction: "rtl",
  brand: {},
  tenantThemeId: null,
});

export function useExperienceTheme() {
  return useContext(ExperienceThemeContext);
}

/** Applies tenant/brand CSS variables on a scoped subtree; inherits platform light/dark. */
export function ExperienceThemeProvider({
  children,
  direction = "rtl",
  brand,
  tenantThemeId,
  className,
}: {
  children: ReactNode;
  direction?: ExperienceDirection;
  brand?: ExperienceBrandTokens;
  tenantThemeId?: string | null;
  className?: string;
}) {
  const value = useMemo(
    () => ({
      direction,
      brand: brand ?? {},
      tenantThemeId: tenantThemeId ?? null,
    }),
    [direction, brand, tenantThemeId]
  );

  useEffect(() => {
    const root = document.documentElement;
    root.setAttribute("data-experience-dir", direction);
  }, [direction]);

  const style: React.CSSProperties = {
    direction,
    ...(brand?.accent ? { ["--experience-accent" as string]: brand.accent } : {}),
    ...(brand?.accentSoft ? { ["--experience-accent-soft" as string]: brand.accentSoft } : {}),
    ...(brand?.success ? { ["--experience-success" as string]: brand.success } : {}),
    ...(brand?.warning ? { ["--experience-warning" as string]: brand.warning } : {}),
    ...(brand?.danger ? { ["--experience-danger" as string]: brand.danger } : {}),
  };

  return (
    <ExperienceThemeContext.Provider value={value}>
      <div
        className={className}
        data-experience-theme={tenantThemeId ?? "default"}
        data-experience-dir={direction}
        style={style}
      >
        {children}
      </div>
    </ExperienceThemeContext.Provider>
  );
}