All files / web/src/app/worksheets/shared/[id] page.tsx

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'use client'

import { css } from '@styled/css'
import { stack } from '@styled/patterns'
import { useParams, useRouter } from 'next/navigation'
import { useEffect, useState, useRef } from 'react'
import { PreviewCenter } from '@/app/create/worksheets/components/PreviewCenter'
import { ShareModal } from '@/app/create/worksheets/components/ShareModal'
import { WorksheetConfigProvider } from '@/app/create/worksheets/components/WorksheetConfigContext'
import type { WorksheetFormState } from '@/app/create/worksheets/types'
import { PageWithNav } from '@/components/PageWithNav'
import { useTheme } from '@/contexts/ThemeContext'
import { ResponsiveSharedLayout } from '../components/ResponsiveSharedLayout'
import { SharedWorksheetSummary } from '../components/SharedWorksheetSummary'

interface ShareData {
  id: string
  worksheetType: string
  config: WorksheetFormState
  createdAt: string
  views: number
  title: string | null
}

export default function SharedWorksheetPage() {
  const params = useParams()
  const router = useRouter()
  const shareId = params.id as string
  const { resolvedTheme } = useTheme()
  const isDark = resolvedTheme === 'dark'

  const [shareData, setShareData] = useState<ShareData | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [previewError, setPreviewError] = useState<{
    error: string
    details?: string
  } | null>(null)
  const [preview, setPreview] = useState<string[] | undefined>(undefined)
  const [showEditModal, setShowEditModal] = useState(false)
  const [showShareModal, setShowShareModal] = useState(false)

  // Track if we've already fetched to prevent duplicate API calls in StrictMode
  const hasFetchedRef = useRef(false)

  // Fetch shared worksheet data
  useEffect(() => {
    // Prevent duplicate fetches in React StrictMode
    if (hasFetchedRef.current) {
      return
    }

    const fetchShare = async () => {
      try {
        hasFetchedRef.current = true

        const response = await fetch(`/api/worksheets/share/${shareId}`)

        if (!response.ok) {
          if (response.status === 404) {
            setError('Shared worksheet not found')
          } else {
            setError('Failed to load shared worksheet')
          }
          return
        }

        const data = await response.json()
        console.log('[SharedWorksheetPage] Loaded share data:', {
          pages: data.config.pages,
          problemsPerPage: data.config.problemsPerPage,
          totalProblems: (data.config.pages || 0) * (data.config.problemsPerPage || 0),
          fullConfig: data.config,
        })
        setShareData(data)

        // Don't pre-fetch preview for large worksheets - let WorksheetPreview handle virtual loading
        // Only pre-fetch for small worksheets (≤5 pages) to improve initial load experience
        if (data.config.pages && data.config.pages <= 5) {
          console.log('[SharedWorksheetPage] Pre-fetching preview for small worksheet...')
          try {
            const previewResponse = await fetch('/api/worksheets/preview', {
              method: 'POST',
              headers: { 'Content-Type': 'application/json' },
              body: JSON.stringify({ config: data.config }),
            })

            if (previewResponse.ok) {
              const previewData = await previewResponse.json()
              if (previewData.success) {
                setPreview(previewData.pages)
              } else {
                // Preview generation failed - store error details
                setPreviewError({
                  error: previewData.error || 'Failed to generate preview',
                  details: previewData.details,
                })
              }
            } else {
              setPreviewError({
                error: 'Preview generation failed',
                details: `HTTP ${previewResponse.status}: ${previewResponse.statusText}`,
              })
            }
          } catch (err) {
            console.error('Failed to generate preview:', err)
            setPreviewError({
              error: 'Failed to generate preview',
              details: err instanceof Error ? err.message : String(err),
            })
          }
        } else {
          console.log(
            `[SharedWorksheetPage] Skipping pre-fetch for large worksheet (${data.config.pages} pages) - using virtual loading`
          )
        }
      } catch (err) {
        console.error('Error fetching shared worksheet:', err)
        setError('Failed to load shared worksheet')
      } finally {
        setLoading(false)
      }
    }

    fetchShare()
  }, [shareId])

  const handleOpenInEditor = async () => {
    if (!shareData) return

    // Save shared config to user's session (overwrites current settings)
    try {
      await fetch('/api/worksheets/settings', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          type: 'addition',
          config: shareData.config,
        }),
      })

      // Navigate to editor
      router.push('/create/worksheets')
    } catch (err) {
      console.error('Failed to save config:', err)
      // TODO: Show error toast
    }
  }

  if (loading) {
    return (
      <div
        className={css({
          minH: '100vh',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          bg: 'gray.50',
        })}
      >
        <div className={stack({ gap: '4', alignItems: 'center' })}>
          <div
            className={css({
              w: '16',
              h: '16',
              border: '4px solid',
              borderColor: 'gray.300',
              borderTopColor: 'brand.600',
              rounded: 'full',
              animation: 'spin 1s linear infinite',
            })}
          />
          <p className={css({ fontSize: 'lg', color: 'gray.600' })}>Loading shared worksheet...</p>
        </div>
      </div>
    )
  }

  if (error || !shareData) {
    return (
      <div
        className={css({
          minH: '100vh',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          bg: 'gray.50',
          p: '4',
        })}
      >
        <div
          className={css({
            maxW: 'md',
            w: 'full',
            bg: 'white',
            rounded: 'xl',
            shadow: 'xl',
            p: '8',
          })}
        >
          <div className={stack({ gap: '4', alignItems: 'center' })}>
            <div className={css({ fontSize: '4xl' })}>❌</div>
            <h1
              className={css({
                fontSize: '2xl',
                fontWeight: 'bold',
                color: 'gray.900',
              })}
            >
              {error || 'Not Found'}
            </h1>
            <p
              className={css({
                fontSize: 'md',
                color: 'gray.600',
                textAlign: 'center',
              })}
            >
              This shared worksheet link may have expired or been removed.
            </p>
            <button
              onClick={() => router.push('/create/worksheets')}
              className={css({
                px: '6',
                py: '3',
                bg: 'brand.600',
                color: 'white',
                fontSize: 'md',
                fontWeight: 'bold',
                rounded: 'lg',
                cursor: 'pointer',
                transition: 'all 0.2s',
                _hover: {
                  bg: 'brand.700',
                },
              })}
            >
              Create Your Own Worksheet
            </button>
          </div>
        </div>
      </div>
    )
  }

  return (
    <PageWithNav>
      <WorksheetConfigProvider
        formState={shareData.config}
        updateFormState={() => {}} // No-op for read-only
        isReadOnly={true}
      >
        <div
          data-component="shared-worksheet-studio"
          className={css({
            height: 'calc(100vh - var(--app-nav-height))',
            bg: isDark ? 'gray.900' : 'gray.50',
            overflow: 'hidden',
            display: 'flex',
            flexDirection: 'column',
          })}
        >
          {/* Read-only banner */}
          <div
            data-component="shared-mode-banner"
            className={css({
              bg: isDark ? 'blue.700' : 'blue.600',
              color: 'white',
              px: '6',
              py: '3',
              display: 'flex',
              alignItems: 'center',
              gap: '3',
              shadow: 'md',
              flexShrink: 0,
              borderBottom: '1px solid',
              borderColor: isDark ? 'blue.600' : 'blue.700',
            })}
          >
            <span className={css({ fontSize: 'xl' })}>🔗</span>
            <div>
              <div className={css({ fontWeight: 'bold', fontSize: 'md' })}>
                Shared Worksheet (Read-Only)
              </div>
              <div
                className={css({
                  fontSize: 'sm',
                  opacity: isDark ? '0.85' : '0.9',
                  color: isDark ? 'blue.100' : 'white',
                })}
              >
                {shareData.title || `Shared by someone • ${shareData.views} views`}
              </div>
            </div>
          </div>

          {/* Worksheet studio layout */}
          <ResponsiveSharedLayout
            config={shareData.config}
            isDark={isDark}
            sidebarContent={<SharedWorksheetSummary config={shareData.config} />}
            previewContent={
              previewError ? (
                <div
                  className={css({
                    h: 'full',
                    display: 'flex',
                    alignItems: 'center',
                    justifyContent: 'center',
                    p: '8',
                    bg: isDark ? 'gray.900' : 'gray.50',
                  })}
                >
                  <div
                    className={css({
                      maxW: '2xl',
                      bg: isDark ? 'gray.800' : 'white',
                      border: '2px solid',
                      borderColor: 'red.500',
                      rounded: 'xl',
                      p: '6',
                      shadow: 'xl',
                    })}
                  >
                    <div className={stack({ gap: '4' })}>
                      <div
                        className={css({
                          display: 'flex',
                          alignItems: 'center',
                          gap: '3',
                        })}
                      >
                        <span className={css({ fontSize: '3xl' })}>⚠️</span>
                        <h3
                          className={css({
                            fontSize: 'xl',
                            fontWeight: 'bold',
                            color: 'red.600',
                          })}
                        >
                          Preview Generation Failed
                        </h3>
                      </div>

                      <div
                        className={css({
                          p: '4',
                          bg: isDark ? 'gray.900' : 'red.50',
                          rounded: 'lg',
                          border: '1px solid',
                          borderColor: isDark ? 'gray.700' : 'red.200',
                        })}
                      >
                        <div
                          className={css({
                            fontSize: 'md',
                            fontWeight: 'semibold',
                            color: isDark ? 'red.400' : 'red.700',
                            mb: '2',
                          })}
                        >
                          {previewError.error}
                        </div>
                        {previewError.details && (
                          <div
                            className={css({
                              fontSize: 'sm',
                              color: isDark ? 'gray.400' : 'gray.700',
                              fontFamily: 'mono',
                              whiteSpace: 'pre-wrap',
                              wordBreak: 'break-word',
                            })}
                          >
                            {previewError.details}
                          </div>
                        )}
                      </div>

                      <div
                        className={css({
                          fontSize: 'sm',
                          color: isDark ? 'gray.400' : 'gray.600',
                        })}
                      >
                        <strong>What this means:</strong> This shared worksheet configuration cannot
                        be previewed because it's missing required data. This may happen if the
                        worksheet was shared before certain features were added to the system.
                      </div>
                    </div>
                  </div>
                </div>
              ) : (
                <PreviewCenter
                  formState={shareData.config}
                  initialPreview={preview}
                  onGenerate={async () => {
                    // Generate and download the worksheet
                    const response = await fetch('/api/create/worksheets/addition', {
                      method: 'POST',
                      headers: { 'Content-Type': 'application/json' },
                      body: JSON.stringify({
                        config: {
                          ...shareData.config,
                          date: new Date().toLocaleDateString('en-US', {
                            month: 'long',
                            day: 'numeric',
                            year: 'numeric',
                          }),
                        },
                      }),
                    })
                    if (response.ok) {
                      const blob = await response.blob()
                      const url = window.URL.createObjectURL(blob)
                      const a = document.createElement('a')
                      a.href = url
                      a.download = `worksheet-${shareData.id}.pdf`
                      document.body.appendChild(a)
                      a.click()
                      window.URL.revokeObjectURL(url)
                      document.body.removeChild(a)
                    }
                  }}
                  status="idle"
                  isReadOnly={true}
                  onShare={async () => {
                    setShowShareModal(true)
                  }}
                  onEdit={() => setShowEditModal(true)}
                />
              )
            }
          />

          {/* Share Modal */}
          <ShareModal
            isOpen={showShareModal}
            onClose={() => setShowShareModal(false)}
            worksheetType="addition"
            config={shareData.config}
            isDark={isDark}
          />

          {/* Edit Modal */}
          {showEditModal && (
            <div
              data-component="edit-modal"
              className={css({
                position: 'fixed',
                inset: 0,
                bg: 'rgba(0, 0, 0, 0.5)',
                display: 'flex',
                alignItems: 'center',
                justifyContent: 'center',
                zIndex: 50,
                p: '4',
              })}
              onClick={() => setShowEditModal(false)}
            >
              <div
                className={css({
                  bg: isDark ? 'gray.800' : 'white',
                  rounded: 'xl',
                  shadow: 'xl',
                  maxW: 'lg',
                  w: 'full',
                  p: '6',
                })}
                onClick={(e) => e.stopPropagation()}
              >
                <div className={stack({ gap: '4' })}>
                  <div>
                    <h2
                      className={css({
                        fontSize: '2xl',
                        fontWeight: 'bold',
                        color: isDark ? 'gray.100' : 'gray.900',
                        mb: '2',
                      })}
                    >
                      Edit This Worksheet?
                    </h2>
                    <p
                      className={css({
                        fontSize: 'md',
                        color: isDark ? 'gray.400' : 'gray.600',
                      })}
                    >
                      Opening this worksheet in the editor will{' '}
                      <strong
                        className={css({
                          color: isDark ? 'yellow.400' : 'orange.600',
                        })}
                      >
                        overwrite your current worksheet settings
                      </strong>
                      . Your current configuration will be replaced with this shared worksheet's
                      settings.
                    </p>
                  </div>

                  <div
                    className={css({
                      bg: isDark ? 'gray.700' : 'gray.50',
                      p: '4',
                      rounded: 'lg',
                      border: '2px solid',
                      borderColor: isDark ? 'gray.600' : 'gray.200',
                    })}
                  >
                    <div
                      className={css({
                        fontSize: 'sm',
                        color: isDark ? 'gray.300' : 'gray.700',
                      })}
                    >
                      <strong>💡 Tip:</strong> If you want to keep your current settings, you can:
                      <ul className={css({ mt: '2', ml: '4', listStyle: 'disc' })}>
                        <li>Download your current worksheet first</li>
                        <li>Open this shared worksheet in a different browser/window</li>
                      </ul>
                    </div>
                  </div>

                  <div
                    className={css({
                      display: 'flex',
                      gap: '3',
                      flexDirection: 'row-reverse',
                    })}
                  >
                    <button
                      data-action="confirm-edit"
                      onClick={handleOpenInEditor}
                      className={css({
                        px: '6',
                        py: '3',
                        bg: 'brand.600',
                        color: 'white',
                        fontSize: 'md',
                        fontWeight: 'bold',
                        rounded: 'lg',
                        cursor: 'pointer',
                        transition: 'all 0.2s',
                        _hover: {
                          bg: 'brand.700',
                        },
                      })}
                    >
                      Replace My Settings & Edit
                    </button>
                    <button
                      data-action="cancel-edit"
                      onClick={() => setShowEditModal(false)}
                      className={css({
                        px: '6',
                        py: '3',
                        bg: isDark ? 'gray.700' : 'gray.200',
                        color: isDark ? 'gray.300' : 'gray.700',
                        fontSize: 'md',
                        fontWeight: 'medium',
                        rounded: 'lg',
                        cursor: 'pointer',
                        transition: 'all 0.2s',
                        _hover: {
                          bg: isDark ? 'gray.600' : 'gray.300',
                        },
                      })}
                    >
                      Cancel
                    </button>
                  </div>
                </div>
              </div>
            </div>
          )}
        </div>
      </WorksheetConfigProvider>
    </PageWithNav>
  )
}