import { NodeSpec, MarkSpec, Schema } from 'prosemirror-model'
import { AnyConfig, Extensions } from '../types'
import { NodeConfig, MarkConfig } from '..'
import splitExtensions from './splitExtensions'
import getAttributesFromExtensions from './getAttributesFromExtensions'
import getRenderedAttributes from './getRenderedAttributes'
import isEmptyObject from '../utilities/isEmptyObject'
import injectExtensionAttributesToParseRule from './injectExtensionAttributesToParseRule'
import callOrReturn from '../utilities/callOrReturn'
import getExtensionField from './getExtensionField'

function cleanUpSchemaItem<T>(data: T) {
  return Object.fromEntries(Object.entries(data).filter(([key, value]) => {
    if (key === 'attrs' && isEmptyObject(value)) {
      return false
    }

    return value !== null && value !== undefined
  })) as T
}

export default function getSchemaByResolvedExtensions(extensions: Extensions): Schema {
  const allAttributes = getAttributesFromExtensions(extensions)
  const { nodeExtensions, markExtensions } = splitExtensions(extensions)
  const topNode = nodeExtensions.find(extension => getExtensionField(extension, 'topNode'))?.name

  const nodes = Object.fromEntries(nodeExtensions.map(extension => {
    const extensionAttributes = allAttributes.filter(attribute => attribute.type === extension.name)
    const context = {
      name: extension.name,
      options: extension.options,
    }

    const extraNodeFields = extensions.reduce((fields, e) => {
      const extendNodeSchema = getExtensionField<AnyConfig['extendNodeSchema']>(
        e,
        'extendNodeSchema',
        context,
      )

      return {
        ...fields,
        ...(extendNodeSchema ? extendNodeSchema(extension) : {}),
      }
    }, {})

    const schema: NodeSpec = cleanUpSchemaItem({
      ...extraNodeFields,
      content: callOrReturn(getExtensionField<NodeConfig['content']>(extension, 'content', context)),
      marks: callOrReturn(getExtensionField<NodeConfig['marks']>(extension, 'marks', context)),
      group: callOrReturn(getExtensionField<NodeConfig['group']>(extension, 'group', context)),
      inline: callOrReturn(getExtensionField<NodeConfig['inline']>(extension, 'inline', context)),
      atom: callOrReturn(getExtensionField<NodeConfig['atom']>(extension, 'atom', context)),
      selectable: callOrReturn(getExtensionField<NodeConfig['selectable']>(extension, 'selectable', context)),
      draggable: callOrReturn(getExtensionField<NodeConfig['draggable']>(extension, 'draggable', context)),
      code: callOrReturn(getExtensionField<NodeConfig['code']>(extension, 'code', context)),
      defining: callOrReturn(getExtensionField<NodeConfig['defining']>(extension, 'defining', context)),
      isolating: callOrReturn(getExtensionField<NodeConfig['isolating']>(extension, 'isolating', context)),
      attrs: Object.fromEntries(extensionAttributes.map(extensionAttribute => {
        return [extensionAttribute.name, { default: extensionAttribute?.attribute?.default }]
      })),
    })

    const parseHTML = callOrReturn(getExtensionField<NodeConfig['parseHTML']>(extension, 'parseHTML', context))

    if (parseHTML) {
      schema.parseDOM = parseHTML
        .map(parseRule => injectExtensionAttributesToParseRule(parseRule, extensionAttributes))
    }

    const renderHTML = getExtensionField<NodeConfig['renderHTML']>(extension, 'renderHTML', context)

    if (renderHTML) {
      schema.toDOM = node => renderHTML({
        node,
        HTMLAttributes: getRenderedAttributes(node, extensionAttributes),
      })
    }

    return [extension.name, schema]
  }))

  const marks = Object.fromEntries(markExtensions.map(extension => {
    const extensionAttributes = allAttributes.filter(attribute => attribute.type === extension.name)
    const context = {
      name: extension.name,
      options: extension.options,
    }

    const extraMarkFields = extensions.reduce((fields, e) => {
      const extendMarkSchema = getExtensionField<AnyConfig['extendMarkSchema']>(
        e,
        'extendMarkSchema',
        context,
      )

      return {
        ...fields,
        ...(extendMarkSchema ? extendMarkSchema(extension) : {}),
      }
    }, {})

    const schema: MarkSpec = cleanUpSchemaItem({
      ...extraMarkFields,
      inclusive: callOrReturn(getExtensionField<NodeConfig['inclusive']>(extension, 'inclusive', context)),
      excludes: callOrReturn(getExtensionField<NodeConfig['excludes']>(extension, 'excludes', context)),
      group: callOrReturn(getExtensionField<NodeConfig['group']>(extension, 'group', context)),
      spanning: callOrReturn(getExtensionField<NodeConfig['spanning']>(extension, 'spanning', context)),
      attrs: Object.fromEntries(extensionAttributes.map(extensionAttribute => {
        return [extensionAttribute.name, { default: extensionAttribute?.attribute?.default }]
      })),
    })

    const parseHTML = callOrReturn(getExtensionField<MarkConfig['parseHTML']>(extension, 'parseHTML', context))

    if (parseHTML) {
      schema.parseDOM = parseHTML
        .map(parseRule => injectExtensionAttributesToParseRule(parseRule, extensionAttributes))
    }

    const renderHTML = getExtensionField<MarkConfig['renderHTML']>(extension, 'renderHTML', context)

    if (renderHTML) {
      schema.toDOM = mark => renderHTML({
        mark,
        HTMLAttributes: getRenderedAttributes(mark, extensionAttributes),
      })
    }

    return [extension.name, schema]
  }))

  return new Schema({
    topNode,
    nodes,
    marks,
  })
}