import { createLogger } from '@sim/logger'
import { authorizeWorkflowByWorkspacePermission } from '@sim/platform-authz/workflow'
import type { NextRequest } from 'next/server'
import {
  type ApiKeyAuthResult,
  authenticateApiKeyFromHeader,
  updateApiKeyLastUsed,
} from '@/lib/api-key/service'
import { type AuthResult, checkHybridAuth } from '@/lib/auth/hybrid'
import { getWorkflowById } from '@/lib/workflows/utils'

const logger = createLogger('WorkflowMiddleware')

export interface ValidationResult {
  error?: { message: string; status: number }
  workflow?: any
  auth?: AuthResult
}

export async function validateWorkflowAccess(
  request: NextRequest,
  workflowId: string,
  requireDeployment = true
): Promise<ValidationResult> {
  try {
    const workflow = await getWorkflowById(workflowId)
    if (!workflow) {
      return {
        error: {
          message: 'Workflow not found',
          status: 404,
        },
      }
    }

    if (!workflow.workspaceId) {
      return {
        error: {
          message:
            'This workflow is not attached to a workspace. Personal workflows are deprecated and cannot be accessed.',
          status: 403,
        },
      }
    }

    if (!requireDeployment) {
      const auth = await checkHybridAuth(request, { requireWorkflowId: false })
      if (!auth.success || !auth.userId) {
        return {
          error: {
            message: auth.error || 'Unauthorized',
            status: 401,
          },
        }
      }

      if (auth.apiKeyType === 'workspace' && auth.workspaceId !== workflow.workspaceId) {
        return {
          error: {
            message: 'API key is not authorized for this workspace',
            status: 403,
          },
        }
      }

      const authorization = await authorizeWorkflowByWorkspacePermission({
        workflowId,
        userId: auth.userId,
        action: 'read',
      })
      if (!authorization.allowed) {
        return {
          error: {
            message: authorization.message || 'Access denied',
            status: authorization.status,
          },
        }
      }

      return { workflow, auth }
    }

    if (requireDeployment) {
      if (!workflow.isDeployed) {
        return {
          error: {
            message: 'Workflow is not deployed',
            status: 403,
          },
        }
      }

      let apiKeyHeader = null
      for (const [key, value] of request.headers.entries()) {
        if (key.toLowerCase() === 'x-api-key' && value) {
          apiKeyHeader = value
          break
        }
      }

      if (!apiKeyHeader) {
        return {
          error: {
            message: 'Unauthorized: API key required',
            status: 401,
          },
        }
      }

      let validResult: ApiKeyAuthResult | null = null

      const workspaceResult = await authenticateApiKeyFromHeader(apiKeyHeader, {
        workspaceId: workflow.workspaceId as string,
        keyTypes: ['workspace', 'personal'],
      })

      if (workspaceResult.success) {
        validResult = workspaceResult
      }

      if (!validResult) {
        return {
          error: {
            message: 'Unauthorized: Invalid API key',
            status: 401,
          },
        }
      }

      if (validResult.keyId) {
        await updateApiKeyLastUsed(validResult.keyId)
      }
    }
    return { workflow }
  } catch (error) {
    logger.error('Validation error:', { error })
    return {
      error: {
        message: 'Internal server error',
        status: 500,
      },
    }
  }
}