import { useState, useCallback, useContext } from 'react'
import PropTypes from 'prop-types'
import {
  Flex,
  Alert,
  Card,
  Spin,
  Splitter,
  Button,
  Modal,
  Segmented,
  Popover,
  Typography
} from 'antd'
import { LoadingOutlined, CaretDownOutlined } from '@ant-design/icons'
import ExclamationOctagonIcon from '../../Icons/ExclamationOctagonIcon.jsx'
import CheckCircleIcon from '../../Icons/CheckCircleIcon.jsx'
import MagicWandIcon from '../../Icons/MagicWandIcon.jsx'
import ObjectProperty from '../common/ObjectProperty.jsx'
import TemplatePreview from './TemplatePreview.jsx'
import DataTree from './DataTree.jsx'
import { ApiServerContext } from '../context/ApiServerContext.jsx'

const { Text } = Typography

const monoStyle = {
  whiteSpace: 'pre',
  display: 'block',
  fontFamily: 'monospace'
}

const EJSErrorFormatter = ({ message }) => {
  const renderLine = (line, index) => {
    const errorLineMatch = line.match(/^(\s*)>>\s*(\d+)\|(.*)$/)
    if (errorLineMatch) {
      const [, indent, lineNum, content] = errorLineMatch
      return (
        <Text key={index} style={monoStyle}>
          {indent}
          <span style={{ color: 'var(--color-error)' }}>{'>>'}</span> {lineNum}|
          {content || '\u00A0'}
        </Text>
      )
    }

    const contextLineMatch = line.match(/^(\s+)(\d+)\|(.*)$/)
    if (contextLineMatch) {
      const [, indent, lineNum, content] = contextLineMatch
      return (
        <Text key={index} style={monoStyle}>
          {indent}
          <span style={{ opacity: 0.5 }}>{lineNum}</span>|{content || '\u00A0'}
        </Text>
      )
    }

    if (/^ejs:\d+/.test(line)) {
      return (
        <Text key={index} style={{ ...monoStyle, opacity: 0.75 }}>
          {line}
        </Text>
      )
    }

    return (
      <Text key={index} style={monoStyle}>
        {line || '\u00A0'}
      </Text>
    )
  }

  return <Flex vertical>{message.split('\n').map(renderLine)}</Flex>
}

EJSErrorFormatter.propTypes = {
  message: PropTypes.string.isRequired
}

const parseEjsErrorLines = (message) => {
  if (!message || typeof message !== 'string') {
    return []
  }

  const lines = new Set()
  const headerMatch = message.match(/^ejs:(\d+)/m)
  if (headerMatch) {
    lines.add(Number(headerMatch[1]))
  }

  for (const match of message.matchAll(/^\s*>>\s*(\d+)\|/gm)) {
    lines.add(Number(match[1]))
  }

  return [...lines]
}

const TemplateEditor = ({
  objectData,
  loading,
  collapseState,
  isEditing,
  style,
  form,
  setObjectData
}) => {
  const { fetchTemplateFormat } = useContext(ApiServerContext)
  const [testObjectOpen, setTestObjectOpen] = useState(false)
  const [testObjectViewMode, setTestObjectViewMode] = useState('Tree')
  const [previewMessage, setPreviewMessage] = useState('No issues found.')
  const [previewError, setPreviewError] = useState(false)
  const [errorLines, setErrorLines] = useState([])
  const [formatLoading, setFormatLoading] = useState(false)
  //const isMobile = useMediaQuery({ maxWidth: 768 })

  const handlePreviewMessage = useCallback((message, isError) => {
    if (isError) {
      setPreviewMessage(
        <Flex gap={'small'} align={'center'} justify={'space-between'}>
          Compile error.
          <Popover
            content={<EJSErrorFormatter message={message} />}
            trigger={['hover', 'click']}
            placement='bottomRight'
            arrow={false}
            overlayStyle={{ minWidth: '560px' }}
          >
            <Button
              type={'text'}
              size={'small'}
              icon={
                <CaretDownOutlined
                  style={{
                    marginLeft: '0.5px',
                    marginBottom: '2.5px',
                    fontSize: '12.5px'
                  }}
                />
              }
            />
          </Popover>
        </Flex>
      )
    } else {
      setPreviewMessage(message)
    }

    setPreviewError(isError)
    setErrorLines(isError ? parseEjsErrorLines(message) : [])
  }, [])

  const handleFormatCode = useCallback(async () => {
    const content = form?.getFieldValue?.('content') ?? objectData?.content
    if (content == null || typeof content !== 'string') {
      return
    }

    setFormatLoading(true)
    try {
      const result = await fetchTemplateFormat(content)
      if (result?.error) {
        handlePreviewMessage(result.error, true)
        return
      }

      if (result?.content == null) {
        return
      }

      form?.setFieldValue?.('content', result.content)
      setObjectData?.((prev) => ({
        ...prev,
        content: result.content
      }))
    } finally {
      setFormatLoading(false)
    }
  }, [
    form,
    objectData?.content,
    fetchTemplateFormat,
    handlePreviewMessage,
    setObjectData
  ])

  return (
    <>
      <Splitter className={'farmcontrol-splitter'} vertical={true}>
        {collapseState.preview == true && (
          <Splitter.Panel style={{ height: '100%' }}>
            <Spin spinning={loading} indicator={<LoadingOutlined />}>
              <Card
                spinning={loading}
                style={style}
                styles={{ body: { height: '100%', padding: '22px' } }}
              >
                <TemplatePreview
                  objectData={objectData?.testObject}
                  documentTemplate={objectData}
                  loading={loading}
                  isEditing={isEditing}
                  style={style}
                  onTestObjectOpen={() => setTestObjectOpen(true)}
                  onPreviewMessage={handlePreviewMessage}
                  showTestObject={true}
                />
              </Card>
            </Spin>
          </Splitter.Panel>
        )}
        {collapseState.editor == true && (
          <Splitter.Panel>
            <Spin spinning={loading} indicator={<LoadingOutlined />}>
              <Card
                style={style}
                styles={{ body: { height: '100%', padding: '22px' } }}
              >
                <Flex vertical gap={'middle'} style={{ height: '100%' }}>
                  <Flex gap={'small'} align={'stretch'}>
                    <Alert
                      message={previewMessage}
                      showIcon
                      style={{
                        padding: '4px 5px 4px 8px',
                        flex: '1 1 auto',
                        minWidth: 0
                      }}
                      icon={
                        previewError ? (
                          <ExclamationOctagonIcon />
                        ) : (
                          <CheckCircleIcon />
                        )
                      }
                      type={previewError ? 'error' : 'success'}
                    />
                    {isEditing && (
                      <Button
                        icon={<MagicWandIcon />}
                        loading={formatLoading}
                        disabled={loading || formatLoading}
                        onClick={handleFormatCode}
                      />
                    )}
                  </Flex>

                  <div
                    style={{
                      width: '100%',
                      height: '100%',
                      flex: '1 1 auto',
                      minHeight: 0
                    }}
                  >
                    <ObjectProperty
                      style={{
                        width: '100%',
                        height: '100%',
                        flex: '1 1 auto',
                        minHeight: 0
                      }}
                      useFormItem={false}
                      name={'content'}
                      height='100%'
                      type='codeBlock'
                      language={'fcTemplateLang'}
                      objectData={objectData}
                      onChange={(value) => {
                        form?.setFieldValue?.('content', value)
                        setObjectData?.((prev) => ({
                          ...prev,
                          content: value
                        }))
                      }}
                      isEditing={isEditing}
                      autoCompleteObject={objectData?.testObject}
                      errorLines={errorLines}
                    />
                  </div>
                </Flex>
              </Card>
            </Spin>
          </Splitter.Panel>
        )}
      </Splitter>
      <Modal
        open={testObjectOpen}
        closeIcon={null}
        width={800}
        footer={
          <Button
            onClick={() => {
              setTestObjectOpen(false)
            }}
          >
            Close
          </Button>
        }
      >
        <Flex gap={'small'} vertical>
          <div>
            <Segmented
              options={['Tree', 'Code']}
              value={testObjectViewMode}
              onChange={(value) => setTestObjectViewMode(value)}
              size='small'
            />
          </div>
          <div
            style={{
              maxHeight: 'calc(var(--unit-100vh) - 280px)',
              overflowY: 'scroll'
            }}
          >
            {testObjectViewMode == 'Code' && (
              <ObjectProperty
                type={'codeBlock'}
                name='testObject'
                language='json'
                objectData={objectData}
                isEditing={true}
              />
            )}
            {testObjectViewMode == 'Tree' && (
              <DataTree
                data={objectData?.testObject}
                defaultExpandAll={true}
                showValueCopy={false}
                showKeyCopy={true}
              />
            )}
          </div>
        </Flex>
      </Modal>
    </>
  )
}

TemplateEditor.propTypes = {
  loading: PropTypes.bool,
  objectData: PropTypes.object,
  collapseState: PropTypes.object,
  isEditing: PropTypes.bool,
  style: PropTypes.object,
  form: PropTypes.object,
  setObjectData: PropTypes.func
}

export default TemplateEditor