// Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

import { isEqualWith } from 'lodash-es'
import { computed, ref, watch } from 'vue'

import { populateEditorNewLines } from '#shared/components/Form/fields/FieldEditor/utils.ts'
import type {
  FormValues,
  FormRef,
  FormSubmitData,
} from '#shared/components/Form/types.ts'
import { getNodeByName } from '#shared/components/Form/utils.ts'
import { useObjectAttributeFormData } from '#shared/entities/object-attributes/composables/useObjectAttributeFormData.ts'
import { useObjectAttributes } from '#shared/entities/object-attributes/composables/useObjectAttributes.ts'
import { useTicketUpdateMutation } from '#shared/entities/ticket/graphql/mutations/update.api.ts'
import type { TicketById } from '#shared/entities/ticket/types.ts'
import type { TicketArticleFormValues } from '#shared/entities/ticket-article/action/plugins/types.ts'
import type {
  TicketUpdateInput,
  TicketUpdateMetaInput,
} from '#shared/graphql/types.ts'
import { EnumObjectManagerObjects } from '#shared/graphql/types.ts'
import { MutationHandler } from '#shared/server/apollo/handler/index.ts'
import type { PartialRequired } from '#shared/types/utils.ts'
import { convertFilesToAttachmentInput } from '#shared/utils/files.ts'

import type { ComputedRef, ShallowRef } from 'vue'

type TicketArticleReceivedFormValues = PartialRequired<
  TicketArticleFormValues,
  // form always has these values
  'articleType' | 'body' | 'internal'
>

export const useTicketEdit = (
  ticket: ComputedRef<TicketById | undefined>,
  form: ShallowRef<FormRef | undefined>,
) => {
  const initialTicketValue = ref<FormValues>()
  const mutationUpdate = new MutationHandler(useTicketUpdateMutation({}))

  watch(
    ticket,
    (newTicket, oldTicket) => {
      if (!newTicket) {
        return
      }

      const ticketId = initialTicketValue.value?.id || newTicket.id
      const { internalId: ownerInternalId } = newTicket.owner

      initialTicketValue.value = {
        id: newTicket.id,
        owner_id: ownerInternalId === 1 ? null : ownerInternalId,
      }

      // We need only to reset the form, when really something was changed (updatedAt is not relevant for the form).
      if (
        !oldTicket ||
        isEqualWith(newTicket, oldTicket, (value1, value2, key) => {
          if (key === 'updatedAt') return true
        })
      ) {
        return
      }

      form.value?.resetForm(
        { values: initialTicketValue.value, object: newTicket },
        {
          // don't reset to new values, if user changes something
          // if ticket is different, it's probably navigation to another ticket,
          // so we can safely reset the form
          // TODO: navigation to another ticket is currently always a re-render of the form, because of the component key(=newTicket.id) or?
          resetDirty: ticketId !== newTicket.id,
        },
      )
    },
    { immediate: true },
  )

  const isTicketFormGroupValid = computed(() => {
    const ticketGroup = form.value?.formNode?.at('ticket')
    return !!ticketGroup?.context?.state.valid
  })

  const { attributesLookup: ticketObjectAttributesLookup } =
    useObjectAttributes(EnumObjectManagerObjects.Ticket)

  const processArticle = (
    formId: string,
    article: TicketArticleReceivedFormValues | undefined,
  ) => {
    if (!article) return null

    const contentType =
      getNodeByName(formId, 'body')?.context?.contentType || 'text/html'

    if (contentType === 'text/html') {
      article.body = populateEditorNewLines(article.body)
    }

    return {
      type: article.articleType,
      body: article.body,
      internal: article.internal,
      cc: article.cc,
      to: article.to,
      subject: article.subject,
      subtype: article.subtype,
      inReplyTo: article.inReplyTo,
      contentType,
      attachments: convertFilesToAttachmentInput(formId, article.attachments),
      security: article.security,
      timeUnit: article.timeUnit,
      accountedTimeTypeId: article.accountedTimeTypeId,
    }
  }

  const editTicket = async (
    formData: FormSubmitData,
    meta?: TicketUpdateMetaInput,
  ) => {
    if (!ticket.value || !form.value) return undefined

    if (!formData.owner_id) {
      formData.owner_id = 1
    }

    const { internalObjectAttributeValues, additionalObjectAttributeValues } =
      useObjectAttributeFormData(ticketObjectAttributesLookup.value, formData)

    const formArticle = formData.article as
      | TicketArticleReceivedFormValues
      | undefined
    const article = processArticle(form.value.formId, formArticle)

    const ticketMeta = meta || {}

    return mutationUpdate.send({
      ticketId: ticket.value.id,
      input: {
        ...internalObjectAttributeValues,
        objectAttributeValues: additionalObjectAttributeValues,
        article,
      } as TicketUpdateInput,
      meta: ticketMeta,
    })
  }

  return {
    initialTicketValue,
    isTicketFormGroupValid,
    editTicket,
  }
}