import { createLogger } from '@sim/logger'
import { type NextRequest, NextResponse } from 'next/server'
import { asanaGetTaskContract } from '@/lib/api/contracts/tools/asana'
import { parseRequest } from '@/lib/api/server'
import { checkInternalAuth } from '@/lib/auth/hybrid'
import { validateAlphanumericId } from '@/lib/core/security/input-validation'
import { withRouteHandler } from '@/lib/core/utils/with-route-handler'

export const dynamic = 'force-dynamic'

const logger = createLogger('AsanaGetTaskAPI')

export const POST = withRouteHandler(async (request: NextRequest) => {
  try {
    const auth = await checkInternalAuth(request)
    if (!auth.success || !auth.userId) {
      return NextResponse.json({ error: auth.error || 'Unauthorized' }, { status: 401 })
    }

    const parsed = await parseRequest(asanaGetTaskContract, request, {})
    if (!parsed.success) return parsed.response
    const { accessToken, taskGid, workspace, project, limit } = parsed.data.body

    if (taskGid) {
      const taskGidValidation = validateAlphanumericId(taskGid, 'taskGid', 100)
      if (!taskGidValidation.isValid) {
        return NextResponse.json({ error: taskGidValidation.error }, { status: 400 })
      }

      const url = `https://app.asana.com/api/1.0/tasks/${taskGid}?opt_fields=gid,name,notes,completed,assignee,assignee.name,due_on,created_at,modified_at,created_by,created_by.name,resource_type,resource_subtype`

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

      if (!response.ok) {
        const errorText = await response.text()
        let errorMessage = `Asana API error: ${response.status} ${response.statusText}`

        try {
          const errorData = JSON.parse(errorText)
          const asanaError = errorData.errors?.[0]
          if (asanaError) {
            errorMessage = `${asanaError.message || errorMessage} (${asanaError.help || ''})`
          }
          logger.error('Asana API error:', {
            status: response.status,
            statusText: response.statusText,
            error: errorData,
          })
        } catch (_e) {
          logger.error('Asana API error (unparsed):', {
            status: response.status,
            statusText: response.statusText,
            error: errorText,
          })
        }

        return NextResponse.json(
          {
            success: false,
            error: errorMessage,
            details: errorText,
          },
          { status: response.status }
        )
      }

      const result = await response.json()
      const task = result.data

      return NextResponse.json({
        success: true,
        ts: new Date().toISOString(),
        gid: task.gid,
        resource_type: task.resource_type,
        resource_subtype: task.resource_subtype,
        name: task.name,
        notes: task.notes || '',
        completed: task.completed || false,
        assignee: task.assignee
          ? {
              gid: task.assignee.gid,
              name: task.assignee.name,
            }
          : undefined,
        created_by: task.created_by
          ? {
              gid: task.created_by.gid,
              resource_type: task.created_by.resource_type,
              name: task.created_by.name,
            }
          : undefined,
        due_on: task.due_on || undefined,
        created_at: task.created_at,
        modified_at: task.modified_at,
      })
    }

    if (!workspace && !project) {
      logger.error('Either taskGid or workspace/project must be provided')
      return NextResponse.json(
        { error: 'Either taskGid or workspace/project must be provided' },
        { status: 400 }
      )
    }

    const params = new URLSearchParams()

    if (project) {
      const projectValidation = validateAlphanumericId(project, 'project', 100)
      if (!projectValidation.isValid) {
        return NextResponse.json({ error: projectValidation.error }, { status: 400 })
      }
      params.append('project', project)
    } else if (workspace) {
      const workspaceValidation = validateAlphanumericId(workspace, 'workspace', 100)
      if (!workspaceValidation.isValid) {
        return NextResponse.json({ error: workspaceValidation.error }, { status: 400 })
      }
      params.append('workspace', workspace)
    }

    if (limit) {
      params.append('limit', String(limit))
    } else {
      params.append('limit', '50')
    }

    params.append(
      'opt_fields',
      'gid,name,notes,completed,assignee,assignee.name,due_on,created_at,modified_at,created_by,created_by.name,resource_type,resource_subtype'
    )

    const url = `https://app.asana.com/api/1.0/tasks?${params.toString()}`

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

    if (!response.ok) {
      const errorText = await response.text()
      let errorMessage = `Asana API error: ${response.status} ${response.statusText}`

      try {
        const errorData = JSON.parse(errorText)
        const asanaError = errorData.errors?.[0]
        if (asanaError) {
          errorMessage = `${asanaError.message || errorMessage} (${asanaError.help || ''})`
        }
        logger.error('Asana API error:', {
          status: response.status,
          statusText: response.statusText,
          error: errorData,
        })
      } catch (_e) {
        logger.error('Asana API error (unparsed):', {
          status: response.status,
          statusText: response.statusText,
          error: errorText,
        })
      }

      return NextResponse.json(
        {
          success: false,
          error: errorMessage,
          details: errorText,
        },
        { status: response.status }
      )
    }

    const result = await response.json()
    const tasks = result.data

    return NextResponse.json({
      success: true,
      ts: new Date().toISOString(),
      tasks: tasks.map((task: any) => ({
        gid: task.gid,
        resource_type: task.resource_type,
        resource_subtype: task.resource_subtype,
        name: task.name,
        notes: task.notes || '',
        completed: task.completed || false,
        assignee: task.assignee
          ? {
              gid: task.assignee.gid,
              name: task.assignee.name,
            }
          : undefined,
        created_by: task.created_by
          ? {
              gid: task.created_by.gid,
              resource_type: task.created_by.resource_type,
              name: task.created_by.name,
            }
          : undefined,
        due_on: task.due_on || undefined,
        created_at: task.created_at,
        modified_at: task.modified_at,
      })),
      next_page: result.next_page,
    })
  } catch (error) {
    logger.error('Error processing request:', error)
    return NextResponse.json(
      {
        error: 'Failed to retrieve Asana task(s)',
        details: (error as Error).message,
      },
      { status: 500 }
    )
  }
})