import { db } from '@sim/db'
import {
  invitation,
  invitationWorkspaceGrant,
  member,
  permissions,
  user,
  workspace,
} from '@sim/db/schema'
import { createLogger } from '@sim/logger'
import { isOrgAdminRole } from '@sim/platform-authz/workspace'
import { and, eq, inArray, isNull, sql } from 'drizzle-orm'
import { type NextRequest, NextResponse } from 'next/server'
import { organizationParamsSchema } from '@/lib/api/contracts/organization'
import { getValidationErrorMessage } from '@/lib/api/server'
import { getSession } from '@/lib/auth'
import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
import { expireStalePendingInvitationsForOrganization } from '@/lib/invitations/core'

const logger = createLogger('OrganizationRosterAPI')

interface RosterWorkspaceAccess {
  workspaceId: string
  workspaceName: string
  permission: 'admin' | 'write' | 'read'
}

export const GET = withRouteHandler(
  async (_request: NextRequest, { params }: { params: Promise<{ id: string }> }) => {
    try {
      const session = await getSession()
      if (!session?.user?.id) {
        return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
      }

      const paramsResult = organizationParamsSchema.safeParse(await params)
      if (!paramsResult.success) {
        return NextResponse.json(
          { error: getValidationErrorMessage(paramsResult.error, 'Invalid route parameters') },
          { status: 400 }
        )
      }

      const { id: organizationId } = paramsResult.data

      const [callerMembership] = await db
        .select({ role: member.role })
        .from(member)
        .where(and(eq(member.organizationId, organizationId), eq(member.userId, session.user.id)))
        .limit(1)

      if (!callerMembership) {
        return NextResponse.json(
          { error: 'Forbidden - Not a member of this organization' },
          { status: 403 }
        )
      }

      if (callerMembership.role !== 'owner' && callerMembership.role !== 'admin') {
        return NextResponse.json(
          { error: 'Forbidden - Organization admin access required' },
          { status: 403 }
        )
      }

      await expireStalePendingInvitationsForOrganization(organizationId)

      const orgWorkspaces = await db
        .select({ id: workspace.id, name: workspace.name })
        .from(workspace)
        .where(and(eq(workspace.organizationId, organizationId), isNull(workspace.archivedAt)))

      const orgWorkspaceIds = orgWorkspaces.map((ws) => ws.id)
      const workspaceNameById = new Map(orgWorkspaces.map((ws) => [ws.id, ws.name]))

      const memberRows = await db
        .select({
          memberId: member.id,
          userId: member.userId,
          role: member.role,
          createdAt: member.createdAt,
          userName: user.name,
          userEmail: user.email,
          userImage: user.image,
        })
        .from(member)
        .innerJoin(user, eq(member.userId, user.id))
        .where(eq(member.organizationId, organizationId))

      const memberUserIds = memberRows.map((row) => row.userId)

      const memberPermissions =
        memberUserIds.length > 0 && orgWorkspaceIds.length > 0
          ? await db
              .select({
                userId: permissions.userId,
                workspaceId: permissions.entityId,
                permission: permissions.permissionType,
              })
              .from(permissions)
              .where(
                and(
                  eq(permissions.entityType, 'workspace'),
                  inArray(permissions.userId, memberUserIds),
                  inArray(permissions.entityId, orgWorkspaceIds)
                )
              )
          : []

      const permissionsByUser = new Map<string, RosterWorkspaceAccess[]>()
      for (const row of memberPermissions) {
        const list = permissionsByUser.get(row.userId) ?? []
        list.push({
          workspaceId: row.workspaceId,
          workspaceName: workspaceNameById.get(row.workspaceId) ?? 'Workspace',
          permission: row.permission,
        })
        permissionsByUser.set(row.userId, list)
      }

      const members = memberRows.map((row) => {
        const isOrgAdmin = isOrgAdminRole(row.role)
        return {
          memberId: row.memberId,
          userId: row.userId,
          role: row.role,
          createdAt: row.createdAt,
          name: row.userName,
          email: row.userEmail,
          image: row.userImage,
          workspaces: isOrgAdmin
            ? orgWorkspaces.map((ws) => ({
                workspaceId: ws.id,
                workspaceName: ws.name,
                permission: 'admin' as const,
              }))
            : (permissionsByUser.get(row.userId) ?? []),
        }
      })

      const externalPermissionRows =
        orgWorkspaceIds.length > 0
          ? await db
              .select({
                userId: user.id,
                userName: user.name,
                userEmail: user.email,
                userImage: user.image,
                workspaceId: permissions.entityId,
                permission: permissions.permissionType,
                createdAt: permissions.createdAt,
              })
              .from(permissions)
              .innerJoin(user, eq(permissions.userId, user.id))
              .leftJoin(
                member,
                and(eq(member.userId, user.id), eq(member.organizationId, organizationId))
              )
              .where(
                and(
                  eq(permissions.entityType, 'workspace'),
                  inArray(permissions.entityId, orgWorkspaceIds),
                  isNull(member.id)
                )
              )
          : []

      const externalMembersByUser = new Map<
        string,
        {
          memberId: string
          userId: string
          role: 'external'
          createdAt: Date
          name: string
          email: string
          image: string | null
          workspaces: RosterWorkspaceAccess[]
        }
      >()

      for (const row of externalPermissionRows) {
        const existing = externalMembersByUser.get(row.userId)
        const workspaceAccess: RosterWorkspaceAccess = {
          workspaceId: row.workspaceId,
          workspaceName: workspaceNameById.get(row.workspaceId) ?? 'Workspace',
          permission: row.permission,
        }

        if (existing) {
          existing.workspaces.push(workspaceAccess)
          if (row.createdAt < existing.createdAt) existing.createdAt = row.createdAt
          continue
        }

        externalMembersByUser.set(row.userId, {
          memberId: `external-${row.userId}`,
          userId: row.userId,
          role: 'external',
          createdAt: row.createdAt,
          name: row.userName,
          email: row.userEmail,
          image: row.userImage,
          workspaces: [workspaceAccess],
        })
      }

      const rosterMembers = [...members, ...externalMembersByUser.values()]

      const pendingInvitationRows = await db
        .select({
          id: invitation.id,
          email: invitation.email,
          role: invitation.role,
          kind: invitation.kind,
          membershipIntent: invitation.membershipIntent,
          createdAt: invitation.createdAt,
          expiresAt: invitation.expiresAt,
          inviteeName: user.name,
          inviteeImage: user.image,
        })
        .from(invitation)
        .leftJoin(user, sql`lower(${user.email}) = lower(${invitation.email})`)
        .where(and(eq(invitation.organizationId, organizationId), eq(invitation.status, 'pending')))

      const pendingInvitationIds = pendingInvitationRows.map((row) => row.id)
      const pendingGrants =
        pendingInvitationIds.length > 0
          ? await db
              .select({
                invitationId: invitationWorkspaceGrant.invitationId,
                workspaceId: invitationWorkspaceGrant.workspaceId,
                permission: invitationWorkspaceGrant.permission,
              })
              .from(invitationWorkspaceGrant)
              .where(inArray(invitationWorkspaceGrant.invitationId, pendingInvitationIds))
          : []

      const grantsByInvitation = new Map<string, RosterWorkspaceAccess[]>()
      for (const row of pendingGrants) {
        const list = grantsByInvitation.get(row.invitationId) ?? []
        list.push({
          workspaceId: row.workspaceId,
          workspaceName: workspaceNameById.get(row.workspaceId) ?? 'Workspace',
          permission: row.permission,
        })
        grantsByInvitation.set(row.invitationId, list)
      }

      const pendingInvitations = pendingInvitationRows.map((row) => ({
        id: row.id,
        email: row.email,
        role: row.membershipIntent === 'external' ? 'external' : row.role,
        kind: row.kind,
        membershipIntent: row.membershipIntent,
        createdAt: row.createdAt,
        expiresAt: row.expiresAt,
        inviteeName: row.inviteeName,
        inviteeImage: row.inviteeImage,
        workspaces: grantsByInvitation.get(row.id) ?? [],
      }))

      return NextResponse.json({
        success: true,
        data: {
          members: rosterMembers,
          pendingInvitations,
          workspaces: orgWorkspaces,
        },
      })
    } catch (error) {
      logger.error('Failed to fetch organization roster', { error })
      return NextResponse.json({ error: 'Failed to fetch organization roster' }, { status: 500 })
    }
  }
)