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import { json, type RequestEvent } from '@sveltejs/kit';
import { promises } from 'fs';

import prisma from '$lib/prisma';
import { tokenIsAvailable } from '$lib/utils';

/** @type {import('./$types').RequestHandler} */

export async function GET({ params, url } : RequestEvent) {
  const id = params.id;
  const filter = url.searchParams.get('filter') || 'new'
  const search = url.searchParams.get('search') || ''

  const gallery = await prisma.gallery.findFirst({
    where: {
      id,
    },
    select: {
      image: true,
      id: true,
      prompt: true,
      createdAt: true,
      user: {
        select: {
          id: true,
          name: true,
          sub: true,
          picture: true,
          preferred_username: true,
        }
      },
      comments: {
        select: {
          id: true,
          createdAt: true,
          text: true,
          user: {
            select: {
              id: true,
              name: true,
              sub: true,
              picture: true,
              preferred_username: true,
            }
          }
        }
      },
      model: {
        select: {
          image: true,
          id: true,
        }
      },
      reactions: {
        select: {
          id: true,
          emoji: true,
          userId: true,
          user: {
            select: {
              id: true,
              name: true,
              sub: true,
              picture: true,
              preferred_username: true,
            }
          }
        }
      }
    }
  })

  if (!gallery) {
    return json({
      error: {
        token: "Gallery not found"
      }
    }, { status: 404 })
  }

  const next = await prisma.gallery.findFirst({
    where: {
      isPublic: true,
      createdAt: {
        lt: gallery.createdAt
      },
      OR: [
        { prompt: { contains: search } },
      ],
    },
    orderBy: {
      ...(filter === 'new' ? {
        createdAt: 'desc'
      } : {
        reactions: {
          _count: 'desc'
        }
      }
      )
    },
    select: {
      id: true,
    }
  })

  const previous = await prisma.gallery.findFirst({
    where: {
      isPublic: true,
      createdAt: {
        gt: gallery.createdAt
      },
      OR: [
        { prompt: { contains: search } },
      ],
    },
    orderBy: {
      ...(filter === 'new' ? {
        createdAt: 'desc'
      } : {
        reactions: {
          _count: 'desc'
        }
      }
      )
    },
    select: {
      id: true,
    }
  })

  return json({
    gallery,
    next: next ? next.id : undefined,
    previous: previous ? previous.id : undefined,
  })
}

export async function DELETE({ params, cookies }: RequestEvent) {
  const id = params.id;

  const token = cookies.get('hf_access_token')
  if (!token) {
    return json({
      error: "You must be logged"
    }, { status: 401 })
  }

  const user = await tokenIsAvailable(token)
  if (!user) {
    return json({
      error: "Invalid token"
    }, { status: 401 })
  }
  
  const gallery = await prisma.gallery.findFirst({
    where: {
      id
    }
  })

  if (gallery?.userId !== user.sub && !process?.env?.SECRET_HF_ADMIN?.includes(user?.sub)) {
    return json({
      error: "You are not authorized to delete this gallery"
    }, { status: 401 })
  }

  if (!gallery) {
    return json({
      error: "Gallery not found"
    }, { status: 404 })
  }

  await prisma.gallery.delete({
    where: {
      id
    }
  })

  await promises.unlink(`${process.env.PUBLIC_FILE_UPLOAD_DIR}/${gallery?.image}`)

  return json({
    success: true
  })
}