import type { MarkConfig, NodeConfig } from '../index.js'
import type { AnyConfig, Attribute, Attributes, ExtensionAttribute, Extensions } from '../types.js'
import { getExtensionField } from './getExtensionField.js'
import { splitExtensions } from './splitExtensions.js'

/**
 * Get a list of all extension attributes defined in `addAttribute` and `addGlobalAttribute`.
 * @param extensions List of extensions
 */
export function getAttributesFromExtensions(extensions: Extensions): ExtensionAttribute[] {
  const extensionAttributes: ExtensionAttribute[] = []
  const { nodeExtensions, markExtensions } = splitExtensions(extensions)
  const nodeAndMarkExtensions = [...nodeExtensions, ...markExtensions]
  const defaultAttribute: Required<Omit<Attribute, 'validate'>> & Pick<Attribute, 'validate'> = {
    default: null,
    validate: undefined,
    rendered: true,
    renderHTML: null,
    parseHTML: null,
    keepOnSplit: true,
    isRequired: false,
  }

  extensions.forEach(extension => {
    const context = {
      name: extension.name,
      options: extension.options,
      storage: extension.storage,
      extensions: nodeAndMarkExtensions,
    }

    const addGlobalAttributes = getExtensionField<AnyConfig['addGlobalAttributes']>(
      extension,
      'addGlobalAttributes',
      context,
    )

    if (!addGlobalAttributes) {
      return
    }

    const globalAttributes = addGlobalAttributes()

    globalAttributes.forEach(globalAttribute => {
      globalAttribute.types.forEach(type => {
        Object.entries(globalAttribute.attributes).forEach(([name, attribute]) => {
          extensionAttributes.push({
            type,
            name,
            attribute: {
              ...defaultAttribute,
              ...attribute,
            },
          })
        })
      })
    })
  })

  nodeAndMarkExtensions.forEach(extension => {
    const context = {
      name: extension.name,
      options: extension.options,
      storage: extension.storage,
    }

    const addAttributes = getExtensionField<NodeConfig['addAttributes'] | MarkConfig['addAttributes']>(
      extension,
      'addAttributes',
      context,
    )

    if (!addAttributes) {
      return
    }

    // TODO: remove `as Attributes`
    const attributes = addAttributes() as Attributes

    Object.entries(attributes).forEach(([name, attribute]) => {
      const mergedAttr = {
        ...defaultAttribute,
        ...attribute,
      }

      if (typeof mergedAttr?.default === 'function') {
        mergedAttr.default = mergedAttr.default()
      }

      if (mergedAttr?.isRequired && mergedAttr?.default === undefined) {
        delete mergedAttr.default
      }

      extensionAttributes.push({
        type: extension.name,
        name,
        attribute: mergedAttr,
      })
    })
  })

  return extensionAttributes
}