import { Metadata } from 'next'
import { notFound } from 'next/navigation'
import {
  Container,
  Typography,
  Box,
  Paper,
  Breadcrumbs,
  Link,
  Avatar
} from '@mui/material'
import {
  Home as HomeIcon,
  Article as ArticleIcon,
  CalendarToday as DateIcon
} from '@mui/icons-material'

interface PageData {
  id: string
  title: string
  slug: string
  content: string
  contentType: 'RICH_TEXT' | 'HTML' | 'MARKDOWN'
  excerpt?: string
  featuredImage?: string
  seoTitle?: string
  seoDescription?: string
  publishedAt: string
  updatedAt: string
}

interface PageProps {
  params: {
    locale: string
    slug: string
  }
}

async function getPageData(slug: string): Promise<PageData | null> {
  try {
    const response = await fetch(`${process.env.NEXTAUTH_URL || 'http://localhost:3010'}/api/pages/${slug}`, {
      next: { revalidate: 300 } // Revalidate every 5 minutes
    })

    if (!response.ok) {
      return null
    }

    const data = await response.json()
    return data.success ? data.data : null
  } catch (error) {
    console.error('Failed to fetch page:', error)
    return null
  }
}

export async function generateMetadata({ params }: PageProps): Promise<Metadata> {
  const page = await getPageData(params.slug)

  if (!page) {
    return {
      title: 'Page Not Found',
      description: 'The requested page could not be found.'
    }
  }

  return {
    title: page.seoTitle || page.title,
    description: page.seoDescription || page.excerpt || `Read ${page.title} on Biblical Guide`,
    openGraph: {
      title: page.seoTitle || page.title,
      description: page.seoDescription || page.excerpt,
      type: 'article',
      publishedTime: page.publishedAt,
      modifiedTime: page.updatedAt,
      ...(page.featuredImage && {
        images: [{
          url: page.featuredImage,
          alt: page.title
        }]
      })
    },
    twitter: {
      card: 'summary_large_image',
      title: page.seoTitle || page.title,
      description: page.seoDescription || page.excerpt,
      ...(page.featuredImage && {
        images: [page.featuredImage]
      })
    }
  }
}

function renderContent(content: string, contentType: string) {
  switch (contentType) {
    case 'HTML':
      return (
        <Box
          dangerouslySetInnerHTML={{ __html: content }}
          sx={{
            '& img': {
              maxWidth: '100%',
              height: 'auto',
              borderRadius: 1
            },
            '& p': {
              marginBottom: 2
            },
            '& h1, & h2, & h3, & h4, & h5, & h6': {
              marginTop: 3,
              marginBottom: 2
            },
            '& ul, & ol': {
              paddingLeft: 3
            },
            '& blockquote': {
              borderLeft: '4px solid',
              borderColor: 'primary.main',
              paddingLeft: 2,
              marginLeft: 0,
              fontStyle: 'italic',
              backgroundColor: 'grey.50',
              padding: 2,
              borderRadius: 1
            },
            '& code': {
              backgroundColor: 'grey.100',
              padding: '2px 4px',
              borderRadius: '4px',
              fontFamily: 'monospace'
            },
            '& pre': {
              backgroundColor: 'grey.100',
              padding: 2,
              borderRadius: 1,
              overflow: 'auto'
            }
          }}
        />
      )

    case 'MARKDOWN':
      // For now, render as plain text. In the future, you could add a markdown parser
      return (
        <Typography component="div" sx={{ whiteSpace: 'pre-wrap' }}>
          {content}
        </Typography>
      )

    default: // RICH_TEXT
      return (
        <Box
          dangerouslySetInnerHTML={{ __html: content }}
          sx={{
            '& img': {
              maxWidth: '100%',
              height: 'auto',
              borderRadius: 1
            },
            '& p': {
              marginBottom: 2
            },
            '& h1, & h2, & h3, & h4, & h5, & h6': {
              marginTop: 3,
              marginBottom: 2
            },
            '& ul, & ol': {
              paddingLeft: 3
            },
            '& blockquote': {
              borderLeft: '4px solid',
              borderColor: 'primary.main',
              paddingLeft: 2,
              marginLeft: 0,
              fontStyle: 'italic',
              backgroundColor: 'grey.50',
              padding: 2,
              borderRadius: 1
            }
          }}
        />
      )
  }
}

export default async function PageView({ params }: PageProps) {
  const page = await getPageData(params.slug)

  if (!page) {
    notFound()
  }

  const formatDate = (dateString: string) => {
    return new Date(dateString).toLocaleDateString(params.locale, {
      year: 'numeric',
      month: 'long',
      day: 'numeric'
    })
  }

  return (
    <Box sx={{ minHeight: '100vh', bgcolor: 'background.default' }}>
      <Container maxWidth="lg" sx={{ py: 4 }}>
        {/* Breadcrumbs */}
        <Breadcrumbs aria-label="breadcrumb" sx={{ mb: 3 }}>
          <Link
            underline="hover"
            sx={{ display: 'flex', alignItems: 'center' }}
            color="inherit"
            href={`/${params.locale}`}
          >
            <HomeIcon sx={{ mr: 0.5 }} fontSize="inherit" />
            Home
          </Link>
          <Typography
            color="text.primary"
            sx={{ display: 'flex', alignItems: 'center' }}
          >
            <ArticleIcon sx={{ mr: 0.5 }} fontSize="inherit" />
            {page.title}
          </Typography>
        </Breadcrumbs>

        <Paper sx={{ p: 4 }}>
          {/* Header */}
          <Box sx={{ mb: 4 }}>
            {/* Featured Image */}
            {page.featuredImage && (
              <Box sx={{ mb: 3 }}>
                <img
                  src={page.featuredImage}
                  alt={page.title}
                  style={{
                    width: '100%',
                    maxHeight: '400px',
                    objectFit: 'cover',
                    borderRadius: '8px'
                  }}
                />
              </Box>
            )}

            {/* Title */}
            <Typography
              variant="h3"
              component="h1"
              gutterBottom
              sx={{
                fontWeight: 700,
                color: 'text.primary',
                mb: 2
              }}
            >
              {page.title}
            </Typography>

            {/* Excerpt */}
            {page.excerpt && (
              <Typography
                variant="h6"
                color="text.secondary"
                sx={{
                  fontWeight: 400,
                  mb: 3,
                  fontStyle: 'italic'
                }}
              >
                {page.excerpt}
              </Typography>
            )}

            {/* Meta Information */}
            <Box sx={{
              display: 'flex',
              alignItems: 'center',
              gap: 2,
              mb: 4,
              pb: 2,
              borderBottom: '1px solid',
              borderColor: 'divider'
            }}>
              <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
                <DateIcon sx={{ fontSize: 16, color: 'text.secondary' }} />
                <Typography variant="caption" color="text.secondary">
                  Published {formatDate(page.publishedAt)}
                </Typography>
              </Box>
              {page.updatedAt !== page.publishedAt && (
                <Typography variant="caption" color="text.secondary">
                  • Updated {formatDate(page.updatedAt)}
                </Typography>
              )}
            </Box>
          </Box>

          {/* Content */}
          <Box sx={{
            typography: 'body1',
            lineHeight: 1.7,
            '& > *:first-of-type': { marginTop: 0 },
            '& > *:last-child': { marginBottom: 0 }
          }}>
            {renderContent(page.content, page.contentType)}
          </Box>
        </Paper>
      </Container>
    </Box>
  )
}