import { createLogger } from '@sim/logger'
import { type NextRequest, NextResponse } from 'next/server'
import { AuditAction, AuditResourceType, recordAudit } from '@/lib/audit/log'
import { getSession } from '@/lib/auth'
import { generateRequestId } from '@/lib/core/utils/request'
import { captureServerEvent } from '@/lib/posthog/server'
import {
  FileConflictError,
  listWorkspaceFiles,
  uploadWorkspaceFile,
  type WorkspaceFileScope,
} from '@/lib/uploads/contexts/workspace'
import { getUserEntityPermissions } from '@/lib/workspaces/permissions/utils'
import { verifyWorkspaceMembership } from '@/app/api/workflows/utils'

export const dynamic = 'force-dynamic'

const logger = createLogger('WorkspaceFilesAPI')

/**
 * GET /api/workspaces/[id]/files
 * List all files for a workspace (requires read permission)
 */
export async function GET(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
  const requestId = generateRequestId()
  const { id: workspaceId } = await params

  try {
    const session = await getSession()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Check workspace permissions (requires read)
    const userPermission = await verifyWorkspaceMembership(session.user.id, workspaceId)
    if (!userPermission) {
      logger.warn(
        `[${requestId}] User ${session.user.id} lacks permission for workspace ${workspaceId}`
      )
      return NextResponse.json({ error: 'Insufficient permissions' }, { status: 403 })
    }

    const scope = (new URL(request.url).searchParams.get('scope') ?? 'active') as WorkspaceFileScope
    if (!['active', 'archived', 'all'].includes(scope)) {
      return NextResponse.json({ error: 'Invalid scope' }, { status: 400 })
    }

    const files = await listWorkspaceFiles(workspaceId, { scope })

    logger.info(`[${requestId}] Listed ${files.length} files for workspace ${workspaceId}`)

    return NextResponse.json({
      success: true,
      files,
    })
  } catch (error) {
    logger.error(`[${requestId}] Error listing workspace files:`, error)
    return NextResponse.json(
      {
        success: false,
        error: error instanceof Error ? error.message : 'Failed to list files',
      },
      { status: 500 }
    )
  }
}

/**
 * POST /api/workspaces/[id]/files
 * Upload a new file to workspace storage (requires write permission)
 */
export async function POST(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
  const requestId = generateRequestId()
  const { id: workspaceId } = await params

  try {
    const session = await getSession()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Check workspace permissions (requires write)
    const userPermission = await getUserEntityPermissions(session.user.id, 'workspace', workspaceId)
    if (userPermission !== 'admin' && userPermission !== 'write') {
      logger.warn(
        `[${requestId}] User ${session.user.id} lacks write permission for workspace ${workspaceId}`
      )
      return NextResponse.json({ error: 'Insufficient permissions' }, { status: 403 })
    }

    const formData = await request.formData()
    const rawFile = formData.get('file')

    if (!rawFile || !(rawFile instanceof File)) {
      return NextResponse.json({ error: 'No file provided' }, { status: 400 })
    }

    const fileName = rawFile.name || 'untitled.md'

    const maxSize = 100 * 1024 * 1024
    if (rawFile.size > maxSize) {
      return NextResponse.json(
        { error: `File size exceeds 100MB limit (${(rawFile.size / (1024 * 1024)).toFixed(2)}MB)` },
        { status: 400 }
      )
    }

    const buffer = Buffer.from(await rawFile.arrayBuffer())

    const userFile = await uploadWorkspaceFile(
      workspaceId,
      session.user.id,
      buffer,
      fileName,
      rawFile.type || 'application/octet-stream'
    )

    logger.info(`[${requestId}] Uploaded workspace file: ${fileName}`)

    captureServerEvent(
      session.user.id,
      'file_uploaded',
      { workspace_id: workspaceId, file_type: rawFile.type || 'application/octet-stream' },
      { groups: { workspace: workspaceId } }
    )

    recordAudit({
      workspaceId,
      actorId: session.user.id,
      actorName: session.user.name,
      actorEmail: session.user.email,
      action: AuditAction.FILE_UPLOADED,
      resourceType: AuditResourceType.FILE,
      resourceId: userFile.id,
      resourceName: fileName,
      description: `Uploaded file "${fileName}"`,
      request,
    })

    return NextResponse.json({
      success: true,
      file: userFile,
    })
  } catch (error) {
    logger.error(`[${requestId}] Error uploading workspace file:`, error)

    const errorMessage = error instanceof Error ? error.message : 'Failed to upload file'
    const isDuplicate =
      error instanceof FileConflictError || errorMessage.includes('already exists')

    return NextResponse.json(
      {
        success: false,
        error: errorMessage,
        isDuplicate,
      },
      { status: isDuplicate ? 409 : 500 }
    )
  }
}
