import type { ShallowRef, ExtractPropTypes, InjectionKey, Ref } from 'vue';
import { provide, defineComponent, unref, inject, watch, shallowRef } from 'vue';
import CacheEntity from './Cache';
import type { Linter } from './linters/interface';
import type { Transformer } from './transformers/interface';
import { arrayType, booleanType, objectType, someType, stringType, withInstall } from '../type';
import initDefaultProps from '../props-util/initDefaultProps';
export const ATTR_TOKEN = 'data-token-hash';
export const ATTR_MARK = 'data-css-hash';
export const ATTR_DEV_CACHE_PATH = 'data-dev-cache-path';

// Mark css-in-js instance in style element
export const CSS_IN_JS_INSTANCE = '__cssinjs_instance__';
export const CSS_IN_JS_INSTANCE_ID = Math.random().toString(12).slice(2);

export function createCache() {
  if (typeof document !== 'undefined' && document.head && document.body) {
    const styles = document.body.querySelectorAll(`style[${ATTR_MARK}]`) || [];
    const { firstChild } = document.head;

    Array.from(styles).forEach(style => {
      (style as any)[CSS_IN_JS_INSTANCE] =
        (style as any)[CSS_IN_JS_INSTANCE] || CSS_IN_JS_INSTANCE_ID;

      // Not force move if no head
      document.head.insertBefore(style, firstChild);
    });

    // Deduplicate of moved styles
    const styleHash: Record<string, boolean> = {};
    Array.from(document.querySelectorAll(`style[${ATTR_MARK}]`)).forEach(style => {
      const hash = style.getAttribute(ATTR_MARK)!;
      if (styleHash[hash]) {
        if ((style as any)[CSS_IN_JS_INSTANCE] === CSS_IN_JS_INSTANCE_ID) {
          style.parentNode?.removeChild(style);
        }
      } else {
        styleHash[hash] = true;
      }
    });
  }

  return new CacheEntity();
}

export type HashPriority = 'low' | 'high';

export interface StyleContextProps {
  autoClear?: boolean;
  /** @private Test only. Not work in production. */
  mock?: 'server' | 'client';
  /**
   * Only set when you need ssr to extract style on you own.
   * If not provided, it will auto create <style /> on the end of Provider in server side.
   */
  cache: CacheEntity;
  /** Tell children that this context is default generated context */
  defaultCache: boolean;
  /** Use `:where` selector to reduce hashId css selector priority */
  hashPriority?: HashPriority;
  /** Tell cssinjs where to inject style in */
  container?: Element | ShadowRoot;
  /** Component wil render inline  `<style />` for fallback in SSR. Not recommend. */
  ssrInline?: boolean;
  /** Transform css before inject in document. Please note that `transformers` do not support dynamic update */
  transformers?: Transformer[];
  /**
   * Linters to lint css before inject in document.
   * Styles will be linted after transforming.
   * Please note that `linters` do not support dynamic update.
   */
  linters?: Linter[];
}

const StyleContextKey: InjectionKey<ShallowRef<Partial<StyleContextProps>>> =
  Symbol('StyleContextKey');

export type UseStyleProviderProps = Partial<StyleContextProps> | Ref<Partial<StyleContextProps>>;
const defaultStyleContext: StyleContextProps = {
  cache: createCache(),
  defaultCache: true,
  hashPriority: 'low',
};
export const useStyleInject = () => {
  return inject(StyleContextKey, shallowRef({ ...defaultStyleContext }));
};
export const useStyleProvider = (props: UseStyleProviderProps) => {
  const parentContext = useStyleInject();
  const context = shallowRef<Partial<StyleContextProps>>({ ...defaultStyleContext });
  watch(
    [props, parentContext],
    () => {
      const mergedContext: Partial<StyleContextProps> = {
        ...parentContext.value,
      };
      const propsValue = unref(props);
      Object.keys(propsValue).forEach(key => {
        const value = propsValue[key];
        if (propsValue[key] !== undefined) {
          mergedContext[key] = value;
        }
      });

      const { cache } = propsValue;
      mergedContext.cache = mergedContext.cache || createCache();
      mergedContext.defaultCache = !cache && parentContext.value.defaultCache;
      context.value = mergedContext;
    },
    { immediate: true },
  );
  provide(StyleContextKey, context);
  return context;
};
export const styleProviderProps = () => ({
  autoClear: booleanType(),
  /** @private Test only. Not work in production. */
  mock: stringType<'server' | 'client'>(),
  /**
   * Only set when you need ssr to extract style on you own.
   * If not provided, it will auto create <style /> on the end of Provider in server side.
   */
  cache: objectType<CacheEntity>(),
  /** Tell children that this context is default generated context */
  defaultCache: booleanType(),
  /** Use `:where` selector to reduce hashId css selector priority */
  hashPriority: stringType<HashPriority>(),
  /** Tell cssinjs where to inject style in */
  container: someType<Element | ShadowRoot>(),
  /** Component wil render inline  `<style />` for fallback in SSR. Not recommend. */
  ssrInline: booleanType(),
  /** Transform css before inject in document. Please note that `transformers` do not support dynamic update */
  transformers: arrayType<Transformer[]>(),
  /**
   * Linters to lint css before inject in document.
   * Styles will be linted after transforming.
   * Please note that `linters` do not support dynamic update.
   */
  linters: arrayType<Linter[]>(),
});
export type StyleProviderProps = Partial<ExtractPropTypes<ReturnType<typeof styleProviderProps>>>;
export const StyleProvider = withInstall(
  defineComponent({
    name: 'AStyleProvider',
    inheritAttrs: false,
    props: initDefaultProps(styleProviderProps(), defaultStyleContext),
    setup(props, { slots }) {
      useStyleProvider(props);
      return () => slots.default?.();
    },
  }),
);

export default {
  useStyleInject,
  useStyleProvider,
  StyleProvider,
};