import { Button, Card, EmptyState, Textarea } from '../ui'
import { t } from '@/lib/i18n'
import type { Page } from '@/types/nostr'

export function PagesManager(params: {
  pages: Page[]
  onPageContentChange: (pageNumber: number, content: string) => void
  onPageTypeChange: (pageNumber: number, type: 'markdown' | 'image') => void
  onRemovePage: (pageNumber: number) => void
  onImageUpload: (file: File, pageNumber: number) => Promise<void>
}): React.ReactElement {
  if (params.pages.length === 0) {
    return <EmptyState title={t('page.empty')} className="py-6" />
  }
  return (
    <div className="space-y-4">
      <h3 className="text-lg font-semibold">{t('page.title')}</h3>
      {params.pages.map((page) => (
        <PageEditor
          key={page.number}
          page={page}
          onContentChange={(content) => params.onPageContentChange(page.number, content)}
          onTypeChange={(type) => params.onPageTypeChange(page.number, type)}
          onRemove={() => params.onRemovePage(page.number)}
          onImageUpload={async (file) => {
            await params.onImageUpload(file, page.number)
          }}
        />
      ))}
    </div>
  )
}

function PageEditor(params: {
  page: Page
  onContentChange: (content: string) => void
  onTypeChange: (type: 'markdown' | 'image') => void
  onRemove: () => void
  onImageUpload: (file: File) => Promise<void>
}): React.ReactElement {
  return (
    <Card variant="default" className="space-y-3">
      <PageEditorHeader page={params.page} onTypeChange={params.onTypeChange} onRemove={params.onRemove} />
      <PageEditorBody page={params.page} onContentChange={params.onContentChange} onImageUpload={params.onImageUpload} />
    </Card>
  )
}

function PageEditorHeader(params: { page: Page; onTypeChange: (type: 'markdown' | 'image') => void; onRemove: () => void }): React.ReactElement {
  return (
    <div className="flex items-center justify-between">
      <h4 className="font-semibold">
        {t('page.number', { number: params.page.number })} - {t(`page.type.${params.page.type}`)}
      </h4>
      <div className="flex items-center gap-2">
        <select
          value={params.page.type}
          onChange={(e) => params.onTypeChange(e.target.value as 'markdown' | 'image')}
          className="text-sm border rounded px-2 py-1"
        >
          <option value="markdown">{t('page.type.markdown')}</option>
          <option value="image">{t('page.type.image')}</option>
        </select>
        <Button
          type="button"
          variant="danger"
          size="small"
          onClick={params.onRemove}
          className="px-2 py-1 text-sm rounded bg-red-600 text-white hover:bg-red-700"
        >
          {t('page.remove')}
        </Button>
      </div>
    </div>
  )
}

function PageEditorBody(params: { page: Page; onContentChange: (content: string) => void; onImageUpload: (file: File) => Promise<void> }): React.ReactElement {
  if (params.page.type === 'markdown') {
    return (
      <Textarea
        value={params.page.content}
        onChange={(e: React.ChangeEvent<HTMLTextAreaElement>) => params.onContentChange(e.target.value)}
        placeholder={t('page.markdown.placeholder')}
        className="h-48 font-mono text-sm"
        rows={12}
      />
    )
  }
  return <PageEditorImageBody page={params.page} onContentChange={params.onContentChange} onImageUpload={params.onImageUpload} />
}

function PageEditorImageBody(params: { page: Page; onContentChange: (content: string) => void; onImageUpload: (file: File) => Promise<void> }): React.ReactElement {
  if (params.page.content) {
    return (
      <div className="relative">
        <img src={params.page.content} alt={t('page.image.alt', { number: params.page.number })} className="max-w-full h-auto rounded" />
        <Button
          type="button"
          variant="danger"
          size="small"
          onClick={() => params.onContentChange('')}
          className="absolute top-2 right-2 px-2 py-1 text-sm rounded bg-red-600 text-white hover:bg-red-700"
        >
          {t('page.image.remove')}
        </Button>
      </div>
    )
  }
  return <PageImageUploadButton onFileSelected={params.onImageUpload} />
}

function PageImageUploadButton(params: { onFileSelected: (file: File) => Promise<void> }): React.ReactElement {
  return (
    <label className="block cursor-pointer text-center">
      <span className="inline-flex items-center justify-center px-3 py-2 text-sm rounded bg-blue-600 text-white hover:bg-blue-700 transition-colors">
        {t('page.image.upload')}
      </span>
      <input
        type="file"
        accept=".png,.jpg,.jpeg,.webp"
        className="hidden"
        onChange={(e) => {
          const file = e.target.files?.[0]
          if (file) {
            void params.onFileSelected(file)
          }
        }}
      />
    </label>
  )
}

export function createPagesHandlers(params: {
  pages: Page[]
  onPagesChange: ((pages: Page[]) => void) | undefined
}): {
  addPage: (type: 'markdown' | 'image') => void
  setPageContent: (pageNumber: number, content: string) => void
  setPageType: (pageNumber: number, type: 'markdown' | 'image') => void
  removePage: (pageNumber: number) => void
} {
  const update = (next: Page[]): void => {
    params.onPagesChange?.(next)
  }
  return {
    addPage: (type: 'markdown' | 'image'): void => {
      if (!params.onPagesChange) {
        return
      }
      const newPage: Page = { number: params.pages.length + 1, type, content: '' }
      update([...params.pages, newPage])
    },
    setPageContent: (pageNumber: number, content: string): void => {
      if (!params.onPagesChange) {
        return
      }
      update(params.pages.map((p) => (p.number === pageNumber ? { ...p, content } : p)))
    },
    setPageType: (pageNumber: number, type: 'markdown' | 'image'): void => {
      if (!params.onPagesChange) {
        return
      }
      update(params.pages.map((p) => (p.number === pageNumber ? { ...p, type, content: '' } : p)))
    },
    removePage: (pageNumber: number): void => {
      if (!params.onPagesChange) {
        return
      }
      update(params.pages.filter((p) => p.number !== pageNumber).map((p, idx) => ({ ...p, number: idx + 1 })))
    },
  }
}