"use client"

import * as React from "react"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Badge } from "@/components/ui/badge"
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { AlertTriangle, Save, Mail, RefreshCw, Settings2, Code2, Lightbulb, Moon, Sun } from "lucide-react"
import { toast } from "sonner"
import { type TemplateWithVariables } from "@/db/schema"
import { previewTemplateAction, updateTemplateAction } from "../service"
import { useSession } from "next-auth/react"
import { HtmlCodeEditor } from "@/components/template-editor/html-code-editor"
import { formatHtml } from "@/lib/utils"

interface TemplateContentEditorProps {
    template: TemplateWithVariables
    onUpdate: (template: TemplateWithVariables) => void
}

export function TemplateContentEditor({ template, onUpdate }: TemplateContentEditorProps) {
    const [content, setContent] = React.useState(() => {
        return formatHtml(template.content)
    })
    const [subject, setSubject] = React.useState(template.subject || '')
    const [isLoading, setIsLoading] = React.useState(false)
    const [isPreviewLoading, setIsPreviewLoading] = React.useState(false)
    const [previewHtml, setPreviewHtml] = React.useState<string>("")
    const [previewSubject, setPreviewSubject] = React.useState<string>("")
    const [validationErrors, setValidationErrors] = React.useState<string[]>([])
    const [sampleData, setSampleData] = React.useState(template.sampleData || {})
    const [autoPreview, setAutoPreview] = React.useState(true)
    const [darkMode, setDarkMode] = React.useState(false) // 다크모드 상태 추가
    const { data: session } = useSession();

    React.useEffect(() => {
        if (template.content !== content) {
          const formatted = formatHtml(template.content)
          setContent(formatted)
        }
      }, [template.content])

    // HtmlCodeEditor ref
    const editorRef = React.useRef<{
        focus: () => void
        insertText: (text: string) => void
        getEditor: () => any
    }>(null)

    // 자동 미리보기 (디바운스) - 시간 늘림
    React.useEffect(() => {
        if (!autoPreview) return

        const timer = setTimeout(() => {
            handlePreview(true)
        }, 1500) // 1.5초로 증가

        return () => clearTimeout(timer)
    }, [content, subject, sampleData, autoPreview])

    // 실시간 검증
    React.useEffect(() => {
        validateContent(content, subject)
    }, [content, subject])

    // 변수 사용량 분석
    const analyzeVariableUsage = React.useCallback(() => {
        const templateVars = template.variables.map(v => v.variableName)
        const usedVars = new Set<string>()

        const combinedText = content + ' ' + subject
        const matches = combinedText.match(/\{\{\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*\}\}/g)
        if (matches) {
            matches.forEach(match => {
                const varName = match.replace(/\{\{\s*|\s*\}\}/g, '')
                usedVars.add(varName)
            })
        }

        const unusedVars = templateVars.filter(v => !usedVars.has(v))
        const undefinedVars = Array.from(usedVars).filter(v =>
            !templateVars.includes(v) &&
            !['t', 'siteName', 'companyName', 'i18n'].includes(v)
        )

        return { unusedVars, undefinedVars, usedVars: Array.from(usedVars) }
    }, [content, subject, template.variables])

    // 검증 함수
    const validateContent = (content: string, subject: string) => {
        const errors: string[] = []

        if (subject.length > 200) {
            errors.push('이메일 제목이 너무 깁니다 (200자 초과)')
        }

        const forbiddenChars = ['\n', '\r', '\t']
        forbiddenChars.forEach(char => {
            if (subject.includes(char)) {
                errors.push('이메일 제목에 개행 문자나 탭 문자를 사용할 수 없습니다')
            }
        })

        // HTML 기본 검증 추가
        if (content.trim()) {
            try {
                const parser = new DOMParser()
                const doc = parser.parseFromString(`<div>${content}</div>`, 'text/html')

                const parseError = doc.querySelector('parsererror')
                if (parseError) {
                    errors.push('유효하지 않은 HTML 구조가 감지되었습니다.')
                }
            } catch (error) {
                errors.push('HTML 구문 분석 중 오류가 발생했습니다.')
            }
        }

        const dangerousPatterns = [
            /\{\{\s*(constructor|prototype|__proto__|process|global|require|import|eval|Function)\s*\}\}/gi,
            /\{\{\s*.*\.(constructor|prototype|__proto__)\s*.*\}\}/gi,
        ]

        const combinedText = content + ' ' + subject
        for (const pattern of dangerousPatterns) {
            if (pattern.test(combinedText)) {
                errors.push('보안상 위험한 구문이 감지되었습니다.')
                break
            }
        }

        setValidationErrors(errors)
    }

    // 저장 함수
    const handleSave = async () => {
        if (validationErrors.length > 0) {
            toast.error('검증 오류를 먼저 해결해주세요.')
            return
        }

        setIsLoading(true)
        try {
            if (!session?.user?.id) {
                toast.error("로그인이 필요합니다")
                return
            }

            const result = await updateTemplateAction(template.slug, {
                subject,
                content,
                sampleData,
                updatedBy: Number(session.user.id)
            })

            if (result.success) {
                toast.success('템플릿이 저장되었습니다.')
                onUpdate({
                    ...template,
                    subject,
                    content,
                    sampleData,
                    version: template.version ? template.version + 1 :0
                })
            } else {
                toast.error(result.error || '저장에 실패했습니다.')
            }
        } catch (error) {
            toast.error('저장 중 오류가 발생했습니다.')
        } finally {
            setIsLoading(false)
        }
    }

    // 미리보기 생성
    const handlePreview = async (silent = false) => {
        if (!silent) setIsPreviewLoading(true)

        try {
            const result = await previewTemplateAction(
                template.slug,
                sampleData,
                content,
                subject // 주석 해제
            )


            if (result.success && result.data) {
                setPreviewHtml(result.data.html)
                setPreviewSubject(result.data.subjectHtml)
                if (!silent) toast.success('미리보기가 생성되었습니다.')
            } else {
                if (!silent) toast.error(result.error || '미리보기 생성에 실패했습니다.')
            }
        } catch (error) {
            if (!silent) toast.error('미리보기 생성 중 오류가 발생했습니다.')
        } finally {
            if (!silent) setIsPreviewLoading(false)
        }
    }

    // 변수 삽입 함수 - HtmlCodeEditor 지원
    const insertVariable = (variableName: string, targetField: 'subject' | 'content') => {
        const variable = `{{${variableName}}}`

        if (targetField === 'subject') {
            const input = document.querySelector('input[data-subject-input]') as HTMLInputElement
            if (input) {
                const start = input.selectionStart || 0
                const end = input.selectionEnd || 0
                const newValue = subject.substring(0, start) + variable + subject.substring(end)
                setSubject(newValue)

                setTimeout(() => {
                    input.focus()
                    input.setSelectionRange(start + variable.length, start + variable.length)
                }, 0)
            }
        } else {
            // HtmlCodeEditor에 변수 삽입
            if (editorRef.current) {
                editorRef.current.insertText(variable)
            }
        }
    }

    // HTML 템플릿 스니펫 삽입 - HtmlCodeEditor 지원
    const insertHtmlSnippet = (snippet: string) => {
        if (editorRef.current) {
            editorRef.current.insertText(snippet)
        }
    }

    // 샘플 데이터 업데이트
    const updateSampleData = (key: string, value: any) => {
        const newSampleData = { ...sampleData, [key]: value }
        setSampleData(newSampleData)
    }

    const variableAnalysis = analyzeVariableUsage()

    // HTML 스니펫들 - 개행 추가로 더 깔끔하게
    const htmlSnippets = [
        {
            name: '버튼',
            snippet: `\n<div style="text-align: center; margin: 20px 0;">
  <a href="{{buttonUrl}}" style="background-color: #007bff; color: white; padding: 12px 24px; text-decoration: none; border-radius: 5px; display: inline-block;">
    {{buttonText}}
  </a>
</div>\n`
        },
        {
            name: '구분선',
            snippet: `\n<hr style="border: none; border-top: 1px solid #eee; margin: 30px 0;">\n`
        },
        {
            name: '박스',
            snippet: `\n<div style="background-color: #f8f9fa; border: 1px solid #dee2e6; border-radius: 5px; padding: 20px; margin: 20px 0;">
  {{content}}
</div>\n`
        },
        {
            name: '이미지',
            snippet: `\n<div style="text-align: center; margin: 20px 0;">
  <img src="{{imageUrl}}" alt="{{imageAlt}}" style="max-width: 100%; height: auto;">
</div>\n`
        },
        {
            name: '2열 레이아웃',
            snippet: `\n<table width="100%" cellpadding="0" cellspacing="0" style="margin: 20px 0;">
  <tr>
    <td width="50%" style="padding: 10px;">
      {{leftContent}}
    </td>
    <td width="50%" style="padding: 10px;">
      {{rightContent}}
    </td>
  </tr>
</table>\n`
        },
        {
            name: '헤더',
            snippet: `\n<h2 style="color: #333; margin: 20px 0 10px 0; font-size: 24px;">{{title}}</h2>\n`
        }
    ]

    return (
        <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
            {/* 왼쪽: 편집 영역 */}
            <div className="space-y-6">
                {/* 상태 표시 */}
                <div className="flex items-center justify-between">
                    <div className="flex items-center gap-2">
                        {validationErrors.length > 0 && (
                            <Badge variant="destructive" className="gap-1">
                                <AlertTriangle className="h-3 w-3" />
                                {validationErrors.length}개 오류
                            </Badge>
                        )}

                        {variableAnalysis.undefinedVars.length > 0 && (
                            <Badge variant="secondary" className="gap-1">
                                <AlertTriangle className="h-3 w-3" />
                                {variableAnalysis.undefinedVars.length}개 미정의 변수
                            </Badge>
                        )}

                        <Badge variant="outline">
                            {variableAnalysis.usedVars.length}/{template.variables.length} 변수 사용 중
                        </Badge>
                    </div>

                    <div className="flex items-center gap-2">
                        <Button
                            variant="outline"
                            size="sm"
                            onClick={() => setDarkMode(!darkMode)}
                            title="다크모드 전환"
                        >
                            {darkMode ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
                        </Button>

                        <Button
                            variant="outline"
                            size="sm"
                            onClick={() => setAutoPreview(!autoPreview)}
                            className={autoPreview ? 'bg-blue-50' : ''}
                        >
                            <RefreshCw className={`mr-2 h-4 w-4 ${autoPreview ? 'text-blue-600' : ''}`} />
                            자동 미리보기
                        </Button>

                        <Button
                            size="sm"
                            onClick={handleSave}
                            disabled={isLoading || validationErrors.length > 0}
                        >
                            <Save className="mr-2 h-4 w-4" />
                            {isLoading ? '저장 중...' : '저장'}
                        </Button>
                    </div>
                </div>

                {/* 오류 표시 */}
                {validationErrors.length > 0 && (
                    <div className="bg-red-50 border border-red-200 rounded-lg p-4">
                        <div className="flex items-start gap-3">
                            <AlertTriangle className="h-5 w-5 text-red-600 mt-0.5" />
                            <div>
                                <h3 className="font-semibold text-red-800">검증 오류</h3>
                                <ul className="mt-2 text-sm text-red-700 space-y-1">
                                    {validationErrors.map((error, index) => (
                                        <li key={index}>• {error}</li>
                                    ))}
                                </ul>
                            </div>
                        </div>
                    </div>
                )}

                {/* 이메일 제목 편집 */}
                <Card>
                    <CardHeader>
                        <CardTitle className="flex items-center gap-2">
                            <Mail className="h-5 w-5" />
                            이메일 제목
                        </CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-4">
                        <div>
                            <Label htmlFor="subject">제목 템플릿</Label>
                            <Input
                                id="subject"
                                data-subject-input
                                value={subject}
                                onChange={(e) => setSubject(e.target.value)}
                                placeholder="예: {{userName}}님의 {{type}} 알림"
                                className="font-mono"
                            />
                        </div>

                        <div>
                            <Label className="text-sm font-medium">제목에 변수 삽입</Label>
                            <div className="flex flex-wrap gap-1 mt-2">
                                {template.variables.map(variable => (
                                    <Badge
                                        key={variable.id}
                                        variant="outline"
                                        className="cursor-pointer hover:bg-blue-50"
                                        onClick={() => insertVariable(variable.variableName, 'subject')}
                                    >
                                        {variable.variableName}
                                    </Badge>
                                ))}
                            </div>
                        </div>
                    </CardContent>
                </Card>

                {/* 변수 분석 결과 */}
                {(variableAnalysis.undefinedVars.length > 0 || variableAnalysis.unusedVars.length > 0) && (
                    <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
                        <h3 className="font-semibold text-blue-800 mb-3">변수 사용 분석</h3>

                        {variableAnalysis.undefinedVars.length > 0 && (
                            <div className="mb-3">
                                <h4 className="text-sm font-medium text-blue-700 mb-1">미정의 변수</h4>
                                <div className="flex flex-wrap gap-1">
                                    {variableAnalysis.undefinedVars.map(varName => (
                                        <Badge key={varName} variant="destructive" className="text-xs">
                                            {varName}
                                        </Badge>
                                    ))}
                                </div>
                            </div>
                        )}

                        {variableAnalysis.unusedVars.length > 0 && (
                            <div>
                                <h4 className="text-sm font-medium text-blue-700 mb-1">미사용 변수</h4>
                                <div className="flex flex-wrap gap-1">
                                    {variableAnalysis.unusedVars.map(varName => (
                                        <Badge key={varName} variant="secondary" className="text-xs">
                                            {varName}
                                        </Badge>
                                    ))}
                                </div>
                            </div>
                        )}
                    </div>
                )}

                {/* HTML 스니펫 도구 */}
                <Card>
                    <CardHeader>
                        <CardTitle className="flex items-center gap-2">
                            <Code2 className="h-5 w-5" />
                            빠른 HTML 삽입
                        </CardTitle>
                    </CardHeader>
                    <CardContent>
                        <div className="grid grid-cols-2 gap-2">
                            {htmlSnippets.map((snippet, index) => (
                                <Button
                                    key={index}
                                    variant="outline"
                                    size="sm"
                                    onClick={() => insertHtmlSnippet(snippet.snippet)}
                                    className="justify-start"
                                >
                                    {snippet.name}
                                </Button>
                            ))}
                        </div>
                    </CardContent>
                </Card>

                {/* HtmlCodeEditor로 교체된 HTML 편집기 */}
                <Card>
                    <CardHeader>
                        <CardTitle className="flex items-center gap-2">
                            <Code2 className="h-5 w-5" />
                            HTML 템플릿 편집
                        </CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-4">
                        {/* HtmlCodeEditor 사용 */}
                        <HtmlCodeEditor
                            ref={editorRef}
                            value={content}
                            onChange={setContent}
                            height="600px"
                            darkMode={darkMode}
                            placeholder="HTML 템플릿을 입력하세요..."
                        />

                        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                            {/* 변수 삽입 */}
                            <div className="bg-gray-50 p-4 rounded-lg">
                                <h4 className="font-medium text-gray-900 mb-2">변수 삽입</h4>
                                <div className="flex flex-wrap gap-1">
                                    {template.variables.map(variable => (
                                        <Badge
                                            key={variable.id}
                                            variant="outline"
                                            className="cursor-pointer hover:bg-blue-50"
                                            onClick={() => insertVariable(variable.variableName, 'content')}
                                        >
                                            {variable.variableName}
                                        </Badge>
                                    ))}
                                </div>
                            </div>

                            {/* 도움말 */}
                            <div className="bg-amber-50 p-4 rounded-lg">
                                <h4 className="font-medium text-amber-900 mb-2 flex items-center gap-1">
                                    <Lightbulb className="h-4 w-4" />
                                    이메일 HTML 팁
                                </h4>
                                <ul className="text-sm text-amber-800 space-y-1">
                                    <li>• 테이블 기반 레이아웃 사용</li>
                                    <li>• 인라인 CSS 스타일 권장</li>
                                    <li>• max-width: 600px 권장</li>
                                    <li>• 이미지에 alt 속성 필수</li>
                                </ul>
                            </div>
                        </div>
                    </CardContent>
                </Card>
            </div>

            {/* 오른쪽: 미리보기 영역 */}
            <div className="space-y-6">
                {/* 샘플 데이터 편집 */}
                <Card>
                    <CardHeader>
                        <CardTitle className="flex items-center gap-2">
                            <Settings2 className="h-5 w-5" />
                            샘플 데이터
                        </CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-3">
                        {template.variables.length > 0 ? (
                            <>
                                {template.variables.map(variable => (
                                    <div key={variable.id}>
                                        <Label className="text-sm">{variable.variableName}</Label>
                                        <Input
                                            value={sampleData[variable.variableName] || ''}
                                            onChange={(e) => updateSampleData(variable.variableName, e.target.value)}
                                            placeholder={variable.description || `${variable.variableName} 값 입력`}
                                            className="text-sm"
                                        />
                                    </div>
                                ))}

                                <Button
                                    variant="outline"
                                    size="sm"
                                    onClick={() => handlePreview(false)}
                                    disabled={isPreviewLoading}
                                    className="w-full mt-4"
                                >
                                    <RefreshCw className={`mr-2 h-4 w-4 ${isPreviewLoading ? 'animate-spin' : ''}`} />
                                    미리보기 새로고침
                                </Button>
                            </>
                        ) : (
                            <div className="text-center py-8 text-muted-foreground">
                                <p>변수가 없습니다.</p>
                                <p className="text-sm">변수 관리 탭에서 변수를 추가하세요.</p>
                            </div>
                        )}
                    </CardContent>
                </Card>

                {/* 미리보기 결과 */}
                <Card>
                    <CardHeader>
                        <CardTitle>미리보기</CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-4">
                        {/* 제목 미리보기 */}
                        {previewSubject && (
                            <div className="p-3 bg-blue-50 rounded-lg">
                                <Label className="text-sm font-medium text-blue-900">제목:</Label>
                                <p className="font-semibold text-blue-900 break-words">{previewSubject}</p>
                            </div>
                        )}

                        {/* 내용 미리보기 */}
                        {previewHtml ? (
                            <div className="border rounded-lg bg-white">
                                <iframe
                                    srcDoc={previewHtml}
                                    sandbox="allow-same-origin"
                                    className="w-full h-96 border-0 rounded-lg"
                                    title="Template Preview"
                                />
                            </div>
                        ) : (
                            <div className="flex items-center justify-center h-96 bg-gray-50 rounded-lg border-2 border-dashed border-gray-300">
                                <div className="text-center">
                                    <Mail className="h-12 w-12 text-gray-400 mx-auto mb-4" />
                                    <p className="text-gray-500 mb-2">템플릿을 편집하면 미리보기가 표시됩니다</p>
                                    <Button
                                        variant="outline"
                                        size="sm"
                                        onClick={() => handlePreview(false)}
                                        className="mt-2"
                                    >
                                        미리보기 생성
                                    </Button>
                                </div>
                            </div>
                        )}
                    </CardContent>
                </Card>
            </div>
        </div>
    )
}