import { createLogger } from '@sim/logger'
import { type NextRequest, NextResponse } from 'next/server'
import { confluencePageChildrenContract } from '@/lib/api/contracts/selectors/confluence'
import { parseRequest } from '@/lib/api/server'
import { checkSessionOrInternalAuth } from '@/lib/auth/hybrid'
import { validateAlphanumericId, validateJiraCloudId } from '@/lib/core/security/input-validation'
import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
import { getConfluenceCloudId } from '@/tools/confluence/utils'
import { parseAtlassianErrorMessage } from '@/tools/jira/utils'

const logger = createLogger('ConfluencePageChildrenAPI')

export const dynamic = 'force-dynamic'

/**
 * Get child pages of a specific Confluence page.
 * Uses GET /wiki/api/v2/pages/{id}/children
 */
export const POST = withRouteHandler(async (request: NextRequest) => {
  try {
    const auth = await checkSessionOrInternalAuth(request)
    if (!auth.success || !auth.userId) {
      return NextResponse.json({ error: auth.error || 'Unauthorized' }, { status: 401 })
    }

    const parsed = await parseRequest(confluencePageChildrenContract, request, {})
    if (!parsed.success) return parsed.response

    const {
      domain,
      accessToken,
      pageId,
      cloudId: providedCloudId,
      limit,
      cursor,
    } = parsed.data.body

    if (!domain) {
      return NextResponse.json({ error: 'Domain is required' }, { status: 400 })
    }

    if (!accessToken) {
      return NextResponse.json({ error: 'Access token is required' }, { status: 400 })
    }

    if (!pageId) {
      return NextResponse.json({ error: 'Page ID is required' }, { status: 400 })
    }

    const pageIdValidation = validateAlphanumericId(pageId, 'pageId', 255)
    if (!pageIdValidation.isValid) {
      return NextResponse.json({ error: pageIdValidation.error }, { status: 400 })
    }

    const cloudId = providedCloudId || (await getConfluenceCloudId(domain, accessToken))

    const cloudIdValidation = validateJiraCloudId(cloudId, 'cloudId')
    if (!cloudIdValidation.isValid) {
      return NextResponse.json({ error: cloudIdValidation.error }, { status: 400 })
    }

    const queryParams = new URLSearchParams()
    queryParams.append('limit', String(Math.min(limit, 250)))

    if (cursor) {
      queryParams.append('cursor', cursor)
    }

    const url = `https://api.atlassian.com/ex/confluence/${cloudId}/wiki/api/v2/pages/${pageId}/children?${queryParams.toString()}`

    logger.info(`Fetching child pages for page ${pageId}`)

    const response = await fetch(url, {
      method: 'GET',
      headers: {
        Accept: 'application/json',
        Authorization: `Bearer ${accessToken}`,
      },
    })

    if (!response.ok) {
      const errorText = await response.text()
      logger.error('Confluence API error response:', {
        status: response.status,
        statusText: response.statusText,
        error: errorText,
      })
      return NextResponse.json(
        { error: parseAtlassianErrorMessage(response.status, response.statusText, errorText) },
        { status: response.status }
      )
    }

    const data = await response.json()

    const children = (data.results || []).map((page: any) => ({
      id: page.id,
      title: page.title,
      status: page.status ?? null,
      spaceId: page.spaceId ?? null,
      childPosition: page.childPosition ?? null,
      webUrl: page._links?.webui ?? null,
    }))

    return NextResponse.json({
      children,
      parentId: pageId,
      nextCursor: data._links?.next
        ? new URL(data._links.next, 'https://placeholder').searchParams.get('cursor')
        : null,
    })
  } catch (error) {
    logger.error('Error getting child pages:', error)
    return NextResponse.json(
      { error: (error as Error).message || 'Internal server error' },
      { status: 500 }
    )
  }
})
