import { DX_CLASSNAMES, MULTIVALUE_DELIMITER } from '@/constants/app.constant'
import '@/utils/registerDevExtremeEditors'
import { executeEditorScript } from '@/utils/editorScriptRuntime'
import {
  Form as FormDx,
  type FormRef,
  GroupItem as GroupItemDx,
  SimpleItem as SimpleItemDx,
} from 'devextreme-react/form'
import type { FieldDataChangedEvent, GroupItem } from 'devextreme/ui/form'
import { Dispatch, ReactNode, RefObject, useCallback, useEffect, useRef, useState } from 'react'
import { GridBoxEditorComponent } from './editors/GridBoxEditorComponent'
import { ImageUploadEditorComponent } from './editors/ImageUploadEditorComponent'
import { ImageViewerEditorComponent } from './editors/ImageViewerEditorComponent'
import { TagBoxEditorComponent } from './editors/TagBoxEditorComponent'
import { RowMode, SimpleItemWithColData } from './types'
import { PlatformEditorTypes } from '@/proxy/form/models'
import { useLocalization } from '@/utils/hooks/useLocalization'
import {
  getValueByField,
  setFormEditorReadOnly,
  shouldRunEditorScriptOnContentReady,
  translateCaption,
} from '../list/shared/editingForm'
import { isTouchLikeDevice } from '../list/shared/editPopup'
import { flattenFormGroups, getCascadeParentFields } from './shared/formItems'

/** Kendi render'ını yapan platform editörleri. */
const CUSTOM_EDITOR_TYPES = [
  PlatformEditorTypes.dxTagBox,
  PlatformEditorTypes.dxGridBox,
  PlatformEditorTypes.dxImageUpload,
  PlatformEditorTypes.dxImageViewer,
] as const

const FormDevExpress = (props: {
  listFormCode: string
  isSubForm?: boolean
  mode: RowMode
  refForm: RefObject<FormRef | null>
  formData: any
  formItems: GroupItem[]
  setFormData: Dispatch<any>
}) => {
  const { listFormCode, isSubForm, mode, refForm, formData, formItems, setFormData } = props
  const { translate } = useLocalization()

  const formDataRef = useRef(formData)
  const formItemsRef = useRef(formItems)
  const formInstanceRef = useRef<any | undefined>(undefined)
  const lastContentReadyScriptKeyRef = useRef<string | undefined>(undefined)
  const didAutoFocusRef = useRef(false)
  const [runtimeReadOnlyFields, setRuntimeReadOnlyFields] = useState<Record<string, boolean>>({})
  const runtimeReadOnlyFieldsRef = useRef<Record<string, boolean>>({})

  formDataRef.current = formData
  formItemsRef.current = formItems

  useEffect(() => {
    runtimeReadOnlyFieldsRef.current = runtimeReadOnlyFields
  }, [runtimeReadOnlyFields])

  useEffect(() => {
    didAutoFocusRef.current = false
  }, [listFormCode, mode])

  const getFieldKey = (formItem: SimpleItemWithColData) =>
    String(formItem.dataField || formItem.name || '').toLowerCase()

  const setRuntimeEditorReadOnly = (field: string, readOnly: boolean) => {
    const key = String(field || '').toLowerCase()
    if (!key || runtimeReadOnlyFieldsRef.current[key] === readOnly) {
      return
    }

    runtimeReadOnlyFieldsRef.current = { ...runtimeReadOnlyFieldsRef.current, [key]: readOnly }
    setRuntimeReadOnlyFields(runtimeReadOnlyFieldsRef.current)
  }

  const getRuntimeEditorReadOnly = (formItem: SimpleItemWithColData) => {
    const key = getFieldKey(formItem)
    return Object.prototype.hasOwnProperty.call(runtimeReadOnlyFields, key)
      ? runtimeReadOnlyFields[key]
      : undefined
  }

  const applyEditorReadOnly = (form: any, field: string, readOnly: boolean) => {
    setRuntimeEditorReadOnly(field, readOnly)
    setFormEditorReadOnly(formInstanceRef.current ?? form, field, readOnly)
  }

  /** Editör script'i / özel editör değişikliklerini forma ve state'e yazar. */
  const commitFormData = useCallback(
    (patch: Record<string, any>, form?: any) => {
      const nextFormData = { ...(formDataRef.current || {}), ...patch }
      formDataRef.current = nextFormData

      const targetForm = form ?? formInstanceRef.current
      targetForm?.option?.('formData', nextFormData)
      Object.keys(patch).forEach((field) => {
        targetForm?.getEditor?.(field)?.option?.('value', patch[field])
      })

      setFormData(nextFormData)
      return nextFormData
    },
    [setFormData],
  )

  const runEditorScript = (formItem: SimpleItemWithColData, eventValue: any) => {
    if (!formItem?.editorScript) return

    const form = formInstanceRef.current
    const dataField = formItem.dataField
    const nextFormData = {
      ...(formDataRef.current || {}),
      ...(form?.option?.('formData') || {}),
      ...(dataField ? { [dataField]: eventValue } : {}),
    }
    formDataRef.current = nextFormData

    try {
      executeEditorScript(formItem.editorScript, {
        formData: nextFormData,
        e: { component: form, dataField, scriptEvent: 'valueChanged', value: eventValue },
        editor: { dataField, component: form },
        runtimeSetEditorReadOnly: (field: string, readOnly: boolean) =>
          applyEditorReadOnly(form, field, readOnly),
        setFormData: (newData: any) => commitFormData(newData || {}, form),
      })
    } catch (err) {
      console.error('Script execution failed for', formItem.name, err)
    }
  }

  /** Özel editörlerin ortak değer değişimi akışı. */
  const handleCustomEditorChange = (formItem: SimpleItemWithColData, value: any) => {
    if (!formItem.dataField) return
    formDataRef.current = { ...formDataRef.current, [formItem.dataField]: value }
    setFormData(formDataRef.current)
    runEditorScript(formItem, value)
  }

  const getEditorOptions = (formItem: SimpleItemWithColData, index?: number) => {
    const runtimeReadOnly = getRuntimeEditorReadOnly(formItem)
    const previousOnValueChanged = formItem.editorOptions?.onValueChanged
    const configuredButtons = formItem.editorOptions?.buttons

    return {
      ...(index !== undefined && mode !== 'view' && !isTouchLikeDevice()
        ? { autoFocus: index === 1 }
        : {}),
      ...(formItem.editorType === 'dxDateBox'
        ? { useMaskBehavior: true, openOnFieldClick: true, showClearButton: true }
        : {}),
      ...(formItem.colData?.placeHolder
        ? { placeholder: translate('::' + formItem.colData.placeHolder) }
        : {}),
      ...formItem.editorOptions,
      ...(runtimeReadOnly !== undefined ? { readOnly: runtimeReadOnly } : {}),
      ...(mode === 'view' ? { readOnly: true } : {}),
      ...(formItem.editorScript
        ? {
            onValueChanged: (e: any) => {
              previousOnValueChanged?.(e)
              if (formItem.dataField) {
                commitFormData({ [formItem.dataField]: e?.value })
              }
              runEditorScript(formItem, e?.value)
            },
          }
        : {}),
      ...(configuredButtons?.length
        ? {
            buttons: configuredButtons.map((button: any) => {
              // Yapılandırmadan string olarak gelen onClick bir kez fonksiyona çevrilir.
              if (typeof button?.options?.onClick !== 'string') return button

              const originalClick = eval(`(${button.options.onClick})`)
              return {
                ...button,
                options: {
                  ...button.options,
                  onClick: (e: any) =>
                    originalClick({
                      ...e,
                      formData: formDataRef.current,
                      fieldName: formItem.dataField,
                      mode,
                    }),
                },
              }
            }),
          }
        : {}),
    }
  }

  const getFormItemKey = (formItem: SimpleItemWithColData, index: number) =>
    `formItem-${formItem.dataField || formItem.name || index}-${String(
      getRuntimeEditorReadOnly(formItem),
    )}`

  // Cascading alanlarda formItems yenilendiğinde editör dataSource'larını güncelle.
  useEffect(() => {
    const form = refForm.current?.instance()
    if (!form) return

    flattenFormGroups(formItems).forEach((item) => {
      if (!item.colData?.lookupDto?.dataSourceType || !item.editorOptions?.dataSource) return

      try {
        form.getEditor(item.dataField!)?.option('dataSource', item.editorOptions.dataSource)
      } catch (err) {
        // Editör henüz oluşmamış olabilir.
        console.debug('Editor update skipped for', item.dataField, err)
      }
    })
  }, [formItems, refForm])

  /** Parent alanı boş olan cascade alanlarını devre dışı bırakır. */
  const updateCascadeDisabledStates = useCallback(() => {
    const form = refForm.current?.instance()
    if (!form || mode === 'view') return

    flattenFormGroups(formItemsRef.current).forEach((item) => {
      const parentFields = getCascadeParentFields(item)
      if (!parentFields.length) return

      try {
        const editor = form.getEditor(item.dataField!)
        if (!editor) return

        editor.option(
          'disabled',
          item.editorOptions?.disabled === true ||
            parentFields.some((parentField) => !formDataRef.current?.[parentField]),
        )
      } catch (err) {
        console.debug('Cascade disabled update skipped for', item.dataField, err)
      }
    })
  }, [mode, refForm])

  useEffect(() => {
    updateCascadeDisabledStates()
  }, [formData, updateCascadeDisabledStates])

  // contentReady sırasında yapılan yazmalar yeni bir contentReady doğurabilir.
  const contentReadyRunningRef = useRef(false)

  /**
   * Form açılışında çalışması gereken script'leri yürütür: salt-okunur
   * kararları ve `@runOnOpen` işaretli varsayılan değer kuralları.
   */
  const runReadOnlyScripts = useCallback(
    (form: any) => {
      if (!form || contentReadyRunningRef.current) return

      const currentFormData = {
        ...(formDataRef.current || {}),
        ...(form?.option?.('formData') || {}),
      }
      formDataRef.current = currentFormData

      contentReadyRunningRef.current = true
      try {
        flattenFormGroups(formItemsRef.current)
          .filter((formItem) => shouldRunEditorScriptOnContentReady(formItem.editorScript))
          .forEach((formItem) => {
            try {
              executeEditorScript(formItem.editorScript!, {
                formData: currentFormData,
                e: {
                  component: form,
                  dataField: formItem.dataField,
                  scriptEvent: 'contentReady',
                  value: getValueByField(currentFormData, formItem.dataField),
                },
                editor: { dataField: formItem.dataField, component: form },
                runtimeSetEditorReadOnly: (field: string, readOnly: boolean) =>
                  applyEditorReadOnly(form, field, readOnly),
                // Açılışta yazma artık destekleniyor; varsayılan değer üreten
                // script'ler bu sayede çalışabiliyor.
                setFormData: (newData: any) => commitFormData(newData || {}, form),
              })
            } catch (err) {
              console.error('Script execution failed on contentReady for', formItem.name, err)
            }
          })
      } finally {
        contentReadyRunningRef.current = false
      }
    },
    // applyEditorReadOnly ref tabanlıdır; her render'da yeniden oluşması sorun değil.
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [],
  )

  useEffect(() => {
    const form = formInstanceRef.current
    if (!form || mode === 'view' || !formData || !formItems?.length) return

    const scriptFields = flattenFormGroups(formItemsRef.current)
      .filter((formItem) => shouldRunEditorScriptOnContentReady(formItem.editorScript))
      .map((formItem) => formItem.dataField)
      .join(MULTIVALUE_DELIMITER)

    if (!scriptFields) return

    const scriptKey = `${mode}|${scriptFields}|${JSON.stringify(formData)}`
    if (lastContentReadyScriptKeyRef.current === scriptKey) return

    lastContentReadyScriptKeyRef.current = scriptKey
    setTimeout(() => runReadOnlyScripts(form), 0)
  }, [formData, formItems, mode, runReadOnlyScripts])

  /** Platform editörünün render fonksiyonunu döner. */
  const renderCustomEditor = (formItem: SimpleItemWithColData): ReactNode => {
    const value = formData[formItem.dataField!]
    const editorOptions = getEditorOptions(formItem)
    const onChange = (next: any) => handleCustomEditorChange(formItem, next)

    switch (formItem.editorType2) {
      case PlatformEditorTypes.dxTagBox:
        return (
          <TagBoxEditorComponent
            value={value || []}
            setDefaultValue={false}
            values={formData}
            options={formItem.tagBoxOptions}
            col={formItem.colData}
            onValueChanged={onChange}
            editorOptions={editorOptions}
          />
        )
      case PlatformEditorTypes.dxGridBox:
        return (
          <GridBoxEditorComponent
            value={value || []}
            values={formData}
            options={formItem.gridBoxOptions}
            col={formItem.colData}
            onValueChanged={onChange}
            editorOptions={editorOptions}
          />
        )
      case PlatformEditorTypes.dxImageUpload:
        return (
          <ImageUploadEditorComponent
            value={value}
            options={formItem.imageUploadOptions}
            onValueChanged={onChange}
            editorOptions={editorOptions}
          />
        )
      case PlatformEditorTypes.dxImageViewer:
        return (
          <ImageViewerEditorComponent
            value={value}
            options={formItem.imageUploadOptions}
            editorOptions={editorOptions}
          />
        )
      default:
        return null
    }
  }

  const renderFormItem = (formItem: SimpleItemWithColData, index: number) => {
    const key = getFormItemKey(formItem, index)
    const label = {
      text: translate('::' + formItem.colData?.captionName),
      className: 'font-semibold',
    }

    if (!CUSTOM_EDITOR_TYPES.includes(formItem.editorType2 as any)) {
      return (
        <SimpleItemDx
          cssClass="font-semibold"
          key={key}
          {...formItem}
          editorOptions={getEditorOptions(formItem, index)}
          label={{ text: label.text }}
        />
      )
    }

    // Görsel editörleri DevExtreme'in bilmediği alan tiplerini yaymamak için
    // yalnızca gerekli alanlarla oluşturulur.
    const isImageEditor =
      formItem.editorType2 === PlatformEditorTypes.dxImageUpload ||
      formItem.editorType2 === PlatformEditorTypes.dxImageViewer
    const itemProps = isImageEditor
      ? {
          dataField: formItem.dataField,
          name: formItem.name,
          colSpan: formItem.colSpan,
          isRequired: formItem.isRequired,
        }
      : formItem

    return (
      <SimpleItemDx
        cssClass="font-semibold"
        key={key}
        {...itemProps}
        render={() => renderCustomEditor(formItem)}
        label={label}
      />
    )
  }

  return (
    <FormDx
      ref={refForm}
      className={`${DX_CLASSNAMES} ${!isSubForm ? 'px-2' : ''} pb-2`}
      formData={formData}
      onFieldDataChanged={(e: FieldDataChangedEvent) => {
        if (!e.dataField) return

        // DevExtreme değeri formData nesnesine yerinde yazar; o durumda hasChanges false kalır ve
        // state yenilenmez. Script'ler formDataRef'ten çalıştığı için ref her değişimde güncellenir,
        // yoksa sonraki commit script'siz alanların değerini (ör. lookup seçimi) eski kopyayla ezerdi.
        formDataRef.current = { ...formDataRef.current, [e.dataField]: e.value }

        const newFormData = { ...formData, [e.dataField]: e.value }
        let hasChanges = !Object.is(formData?.[e.dataField], e.value)

        // Parent alan değiştiğinde bağımlı (cascade) alanları temizle.
        flattenFormGroups(formItemsRef.current)
          .filter((item) => getCascadeParentFields(item).includes(e.dataField!))
          .forEach((child) => {
            if (!Object.is(newFormData[child.dataField!], null)) {
              newFormData[child.dataField!] = null
              hasChanges = true
            }
          })

        if (hasChanges) {
          formDataRef.current = newFormData
          setFormData(newFormData)
        }

        // Editör güncellemesi tamamlandıktan sonra devre dışı durumlarını yenile.
        setTimeout(updateCascadeDisabledStates, 0)
      }}
      onContentReady={(e) => {
        formInstanceRef.current = e.component
        runReadOnlyScripts(e.component)

        const firstItem = (e.component.option('items') as any[])?.[0]?.items?.[0]
        if (
          !didAutoFocusRef.current &&
          firstItem?.dataField &&
          mode !== 'view' &&
          !isTouchLikeDevice()
        ) {
          didAutoFocusRef.current = true
          e.component.getEditor(firstItem.dataField)?.focus()
        }
      }}
    >
      {formItems.map((formGroupItem, groupIndex) => (
        <GroupItemDx
          key={'formGroupItem-' + groupIndex}
          colCount={formGroupItem.colCount}
          colSpan={formGroupItem.colSpan}
          caption={translateCaption(translate, formGroupItem.caption)}
        >
          {(formGroupItem.items as SimpleItemWithColData[])
            ?.filter((formItem) => {
              if (mode === 'edit') return formItem.allowEditing !== false
              if (mode === 'new') return formItem.allowAdding !== false
              return true
            })
            .map(renderFormItem)}
        </GroupItemDx>
      ))}
    </FormDx>
  )
}

export default FormDevExpress