import { clsx } from "clsx";
import type { ClassValue } from "clsx";
import { extendTailwindMerge } from "tailwind-merge";
import type { CompleteOrEmpty } from "@plane/types";

// Support email can be configured by the application
export const getSupportEmail = (defaultEmail: string = ""): string => defaultEmail;

// Matches custom typography classes: text-h1-semibold, text-body-md-regular, text-caption-xs-medium, etc.
const isCustomTypography = (value: string) =>
  !/^(h[1-6]|body-(xs|sm|md)|caption-(xs|sm|md))-(regular|medium|semibold|bold)$/.test(value);

// Matches custom font size classes: text-9, text-10, text-11, text-12, text-13, text-14, text-16, text-18, text-20, text-24, text-28, text-32, text-40
const isCustomFontSize = (value: string) => /^(9|10|11|12|13|14|16|18|20|24|28|32|40)$/.test(value);

// Matches custom text color classes: text-primary, text-on-color, text-secondary, etc.
const CUSTOM_TEXT_COLORS = [
  "primary",
  "secondary",
  "tertiary",
  "placeholder",
  "disabled",
  "accent-primary",
  "accent-secondary",
  "on-color",
  "on-color-disabled",
  "inverse",
  "success",
  "success-primary",
  "success-secondary",
  "warning",
  "warning-primary",
  "warning-secondary",
  "danger",
  "danger-primary",
  "danger-secondary",
];
const isCustomTextColor = (value: string) => CUSTOM_TEXT_COLORS.includes(value);

const twMerge = extendTailwindMerge<"custom-typography" | "custom-text-color">({
  override: {
    classGroups: {
      // Override font-size to include custom numeric sizes and exclude custom typography/colors
      "font-size": [
        {
          text: [
            (value: string) => isCustomFontSize(value) || (!isCustomTypography(value) && !isCustomTextColor(value)),
          ],
        },
      ],
    },
  },
  extend: {
    classGroups: {
      // Custom typography in its own group
      "custom-typography": [{ text: [isCustomTypography] }],
      // Custom text colors in their own group (won't conflict with font sizes)
      "custom-text-color": [{ text: [isCustomTextColor] }],
    },
  },
});

export const cn = (...inputs: ClassValue[]) => twMerge(clsx(inputs));

/**
 * Extracts IDs from an array of objects with ID property
 */
export const extractIds = <T extends { id: string }>(items: T[]): string[] => items.map((item) => item.id);

/**
 * Checks if an ID exists and is valid within the provided list
 */
export const isValidId = (id: string | null | undefined, validIds: string[]): boolean => !!id && validIds.includes(id);

/**
 * Filters an array to only include valid IDs
 */
export const filterValidIds = (ids: string[], validIds: string[]): string[] =>
  ids.filter((id) => validIds.includes(id));

/**
 * Filters an array to include only valid IDs, returning both valid and invalid IDs
 */
export const partitionValidIds = (ids: string[], validIds: string[]): { valid: string[]; invalid: string[] } => {
  const valid: string[] = [];
  const invalid: string[] = [];

  ids.forEach((id) => {
    if (validIds.includes(id)) {
      valid.push(id);
    } else {
      invalid.push(id);
    }
  });

  return { valid, invalid };
};

/**
 * Checks if an object is complete (has properties) rather than empty.
 * This helps TypeScript narrow the type from CompleteOrEmpty<T> to T.
 *
 * @param obj The object to check, typed as CompleteOrEmpty<T>
 * @returns A boolean indicating if the object is complete (true) or empty (false)
 */
export const isComplete = <T>(obj: CompleteOrEmpty<T>): obj is T => {
  // Check if object is not null or undefined
  if (obj == null) return false;

  // Check if it's an object
  if (typeof obj !== "object") return false;

  // Check if it has any own properties
  return Object.keys(obj).length > 0;
};

export const convertRemToPixel = (rem: number): number => rem * 0.9 * 16;