import * as plugins from '../plugins.js';
import { Reception } from './classes.reception.js';
import { UserInvitation } from './classes.userinvitation.js';
import { Organization } from './classes.organization.js';
import { User } from './classes.user.js';
import { Role } from './classes.role.js';

export class UserInvitationManager {
  public receptionRef: Reception;
  public get db() {
    return this.receptionRef.db.smartdataDb;
  }
  public typedrouter = new plugins.typedrequest.TypedRouter();

  public CUserInvitation = plugins.smartdata.setDefaultManagerForDoc(this, UserInvitation);

  constructor(receptionRefArg: Reception) {
    this.receptionRef = receptionRefArg;
    this.receptionRef.typedrouter.addTypedRouter(this.typedrouter);

    this.setupHandlers();
  }

  private setupHandlers() {
    // Create invitation
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_CreateInvitation>(
        'createInvitation',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const email = requestArg.email.toLowerCase().trim();

          // Check if user with this email already exists
          const existingUser = await this.receptionRef.userManager.CUser.getInstance({
            data: { email },
          });
          if (existingUser) {
            // User already exists - just add them to the org directly
            const existingRole = await this.receptionRef.roleManager.CRole.getInstance({
              data: {
                userId: existingUser.id,
                organizationId: requestArg.organizationId,
              },
            });
            if (existingRole) {
              return {
                success: false,
                isNew: false,
                message: 'User is already a member of this organization.',
              };
            }
            // Add user to org with the specified roles
            await this.receptionRef.roleManager.modifyRoleForUserAtOrg({
              action: 'create',
              userId: existingUser.id,
              organizationId: requestArg.organizationId,
              roles: requestArg.roles,
            });
            return {
              success: true,
              isNew: false,
              message: 'Existing user has been added to the organization.',
            };
          }

          // Check if invitation already exists for this email
          let invitation = await this.CUserInvitation.getInstance({
            data: { email },
          });

          let isNew = false;
          if (invitation) {
            // Add org to existing invitation
            await invitation.addOrganization(requestArg.organizationId, user.id, requestArg.roles);
          } else {
            // Create new invitation
            invitation = await UserInvitation.createNewInvitation(
              email,
              requestArg.organizationId,
              user.id,
              requestArg.roles
            );
            isNew = true;
          }

          // Send invitation email
          await this.sendInvitationEmail(invitation, requestArg.organizationId);

          return {
            success: true,
            invitation: await invitation.createSavableObject(),
            isNew,
          };
        }
      )
    );

    // Get org invitations
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_GetOrgInvitations>(
        'getOrgInvitations',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const allInvitations = await this.CUserInvitation.getInstances({});
          const orgInvitations = allInvitations.filter(inv =>
            inv.data.status === 'pending' &&
            !inv.isExpired() &&
            inv.data.organizationRefs.some(ref => ref.organizationId === requestArg.organizationId)
          );

          return {
            invitations: await Promise.all(orgInvitations.map(inv => inv.createSavableObject())),
          };
        }
      )
    );

    // Get org members
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_GetOrgMembers>(
        'getOrgMembers',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsMemberOfOrg(user.id, requestArg.organizationId);

          const roles = await this.receptionRef.roleManager.CRole.getInstances({
            data: { organizationId: requestArg.organizationId },
          });

          const members: Array<{
            user: plugins.idpInterfaces.data.IUser;
            role: plugins.idpInterfaces.data.IRole;
          }> = [];

          for (const role of roles) {
            const memberUser = await this.receptionRef.userManager.CUser.getInstance({
              id: role.data.userId,
            });
            if (memberUser) {
              members.push({
                user: await memberUser.createSavableObject(),
                role: await role.createSavableObject(),
              });
            }
          }

          return { members };
        }
      )
    );

    // Cancel invitation
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_CancelInvitation>(
        'cancelInvitation',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const invitation = await this.CUserInvitation.getInstance({ id: requestArg.invitationId });
          if (!invitation) {
            return { success: false, message: 'Invitation not found.' };
          }

          await invitation.removeOrganization(requestArg.organizationId);

          return { success: true };
        }
      )
    );

    // Resend invitation
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_ResendInvitation>(
        'resendInvitation',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const invitation = await this.CUserInvitation.getInstance({ id: requestArg.invitationId });
          if (!invitation) {
            return { success: false, message: 'Invitation not found.' };
          }

          await invitation.regenerateToken();
          await this.sendInvitationEmail(invitation, requestArg.organizationId);

          return { success: true, message: 'Invitation resent.' };
        }
      )
    );

    // Remove member
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_RemoveMember>(
        'removeMember',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          // Cannot remove yourself if you're the only owner
          const role = await this.receptionRef.roleManager.CRole.getInstance({
            data: {
              userId: requestArg.userId,
              organizationId: requestArg.organizationId,
            },
          });

          if (!role) {
            return { success: false, message: 'Member not found.' };
          }

          // Check if trying to remove an owner
          if (role.data.roles.includes('owner')) {
            // Count owners
            const allRoles = await this.receptionRef.roleManager.CRole.getInstances({
              data: { organizationId: requestArg.organizationId },
            });
            const ownerCount = allRoles.filter(r => r.data.roles.includes('owner')).length;
            if (ownerCount <= 1) {
              return {
                success: false,
                message: 'Cannot remove the last owner. Transfer ownership first.',
              };
            }
          }

          await role.delete();

          // Remove org from user's connectedOrgs
          const memberUser = await this.receptionRef.userManager.CUser.getInstance({
            id: requestArg.userId,
          });
          if (memberUser && memberUser.data.connectedOrgs) {
            memberUser.data.connectedOrgs = memberUser.data.connectedOrgs.filter(
              orgId => orgId !== requestArg.organizationId
            );
            await memberUser.save();
          }

          return { success: true };
        }
      )
    );

    // Update member roles
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_UpdateMemberRoles>(
        'updateMemberRoles',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const role = await this.receptionRef.roleManager.CRole.getInstance({
            data: {
              userId: requestArg.userId,
              organizationId: requestArg.organizationId,
            },
          });

          if (!role) {
            return { success: false, message: 'Member not found.' };
          }

          // If removing owner role, check we're not removing the last owner
          if (role.data.roles.includes('owner') && !requestArg.roles.includes('owner')) {
            const allRoles = await this.receptionRef.roleManager.CRole.getInstances({
              data: { organizationId: requestArg.organizationId },
            });
            const ownerCount = allRoles.filter(r => r.data.roles.includes('owner')).length;
            if (ownerCount <= 1) {
              return {
                success: false,
                message: 'Cannot remove owner role from the last owner.',
              };
            }
          }

          role.data.roles = requestArg.roles;
          await role.save();

          return { success: true, role: await role.createSavableObject() };
        }
      )
    );

    // Transfer ownership
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_TransferOwnership>(
        'transferOwnership',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);

          // Verify current user is an owner
          const currentUserRole = await this.receptionRef.roleManager.CRole.getInstance({
            data: {
              userId: user.id,
              organizationId: requestArg.organizationId,
            },
          });
          if (!currentUserRole || !currentUserRole.data.roles.includes('owner')) {
            throw new plugins.typedrequest.TypedResponseError(
              'Only owners can transfer ownership.'
            );
          }

          // Get new owner's role
          const newOwnerRole = await this.receptionRef.roleManager.CRole.getInstance({
            data: {
              userId: requestArg.newOwnerId,
              organizationId: requestArg.organizationId,
            },
          });
          if (!newOwnerRole) {
            return { success: false, message: 'New owner must be a member of the organization.' };
          }

          // Add owner role to new owner
          if (!newOwnerRole.data.roles.includes('owner')) {
            newOwnerRole.data.roles.push('owner');
            await newOwnerRole.save();
          }

          // Remove owner role from current user (but keep other roles)
          currentUserRole.data.roles = currentUserRole.data.roles.filter(r => r !== 'owner');
          if (currentUserRole.data.roles.length === 0) {
            currentUserRole.data.roles = ['admin']; // Demote to admin
          }
          await currentUserRole.save();

          return { success: true };
        }
      )
    );

    // Get invitation by token
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_GetInvitationByToken>(
        'getInvitationByToken',
        async (requestArg) => {
          const invitation = await this.CUserInvitation.getInstance({
            data: { token: requestArg.token },
          });

          if (!invitation) {
            return { isExpired: true, requiresRegistration: false };
          }

          if (invitation.isExpired()) {
            return { isExpired: true, requiresRegistration: false };
          }

          // Get organization names
          const organizations: Array<{ id: string; name: string }> = [];
          for (const ref of invitation.data.organizationRefs) {
            const org = await this.receptionRef.organizationmanager.COrganization.getInstance({
              id: ref.organizationId,
            });
            if (org) {
              organizations.push({ id: org.id, name: org.data.name });
            }
          }

          // Check if user with this email exists
          const existingUser = await this.receptionRef.userManager.CUser.getInstance({
            data: { email: invitation.data.email },
          });

          return {
            invitation: await invitation.createSavableObject(),
            organizations,
            isExpired: false,
            requiresRegistration: !existingUser,
          };
        }
      )
    );

    // Accept invitation
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_AcceptInvitation>(
        'acceptInvitation',
        async (requestArg) => {
          const invitation = await this.CUserInvitation.getInstance({
            data: { token: requestArg.token },
          });

          if (!invitation) {
            return { success: false, message: 'Invalid invitation token.' };
          }

          if (invitation.isExpired()) {
            return { success: false, message: 'This invitation has expired.' };
          }

          const user = await this.receptionRef.userManager.CUser.getInstance({
            id: requestArg.userId,
          });
          if (!user) {
            return { success: false, message: 'User not found.' };
          }

          // Create roles for each organization
          const organizations: plugins.idpInterfaces.data.IOrganization[] = [];
          const roles: plugins.idpInterfaces.data.IRole[] = [];

          for (const ref of invitation.data.organizationRefs) {
            // Check if role already exists
            let role = await this.receptionRef.roleManager.CRole.getInstance({
              data: {
                userId: user.id,
                organizationId: ref.organizationId,
              },
            });

            if (!role) {
              role = await this.receptionRef.roleManager.modifyRoleForUserAtOrg({
                action: 'create',
                userId: user.id,
                organizationId: ref.organizationId,
                roles: ref.roles,
              });
            }

            roles.push(await role.createSavableObject());

            const org = await this.receptionRef.organizationmanager.COrganization.getInstance({
              id: ref.organizationId,
            });
            if (org) {
              // Add role to org's roleIds if not already there
              if (!org.data.roleIds.includes(role.id)) {
                org.data.roleIds.push(role.id);
                await org.save();
              }
              organizations.push(await org.createSavableObject());
            }

            // Update user's connectedOrgs
            if (!user.data.connectedOrgs) {
              user.data.connectedOrgs = [];
            }
            if (!user.data.connectedOrgs.includes(ref.organizationId)) {
              user.data.connectedOrgs.push(ref.organizationId);
            }
          }

          await user.save();
          await invitation.accept(user.id);

          return { success: true, organizations, roles };
        }
      )
    );

    // Bulk create invitations
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<plugins.idpInterfaces.request.IReq_BulkCreateInvitations>(
        'bulkCreateInvitations',
        async (requestArg) => {
          const user = await this.receptionRef.userManager.getUserByJwtValidation(requestArg.jwt);
          await this.verifyUserIsAdminOfOrg(user.id, requestArg.organizationId);

          const org = await this.receptionRef.organizationmanager.COrganization.getInstance({
            id: requestArg.organizationId,
          });
          const orgName = org?.data.name || 'an organization';

          const results: Array<{
            email: string;
            success: boolean;
            status: 'invited' | 'already_member' | 'invalid_email' | 'error';
            message?: string;
          }> = [];
          const summary = {
            total: 0,
            invited: 0,
            alreadyMembers: 0,
            invalid: 0,
            errors: 0,
          };

          // Deduplicate emails in the batch
          const processedEmails = new Set<string>();

          for (const inv of requestArg.invitations) {
            summary.total++;
            const email = inv.email?.toLowerCase().trim();

            // Validate email format
            if (!email || !this.isValidEmail(email)) {
              results.push({
                email: inv.email || '',
                success: false,
                status: 'invalid_email',
                message: 'Invalid email format',
              });
              summary.invalid++;
              continue;
            }

            // Skip duplicates within batch
            if (processedEmails.has(email)) {
              results.push({
                email,
                success: false,
                status: 'invalid_email',
                message: 'Duplicate email in batch',
              });
              summary.invalid++;
              continue;
            }
            processedEmails.add(email);

            try {
              // Check if user with this email already exists
              const existingUser = await this.receptionRef.userManager.CUser.getInstance({
                data: { email },
              });

              if (existingUser) {
                // Check if already a member
                const existingRole = await this.receptionRef.roleManager.CRole.getInstance({
                  data: {
                    userId: existingUser.id,
                    organizationId: requestArg.organizationId,
                  },
                });

                if (existingRole) {
                  results.push({
                    email,
                    success: false,
                    status: 'already_member',
                    message: 'Already a member of this organization',
                  });
                  summary.alreadyMembers++;
                  continue;
                }

                // Add existing user to org
                const roles = inv.roles?.length ? inv.roles : requestArg.defaultRoles;
                await this.receptionRef.roleManager.modifyRoleForUserAtOrg({
                  action: 'create',
                  userId: existingUser.id,
                  organizationId: requestArg.organizationId,
                  roles,
                });
                results.push({
                  email,
                  success: true,
                  status: 'invited',
                  message: 'Existing user added to organization',
                });
                summary.invited++;
                continue;
              }

              // Check if invitation already exists
              let invitation = await this.CUserInvitation.getInstance({
                data: { email },
              });

              const roles = inv.roles?.length ? inv.roles : requestArg.defaultRoles;

              if (invitation) {
                // Add org to existing invitation
                await invitation.addOrganization(requestArg.organizationId, user.id, roles);
              } else {
                // Create new invitation
                invitation = await UserInvitation.createNewInvitation(
                  email,
                  requestArg.organizationId,
                  user.id,
                  roles
                );
              }

              // Send invitation email
              await this.receptionRef.receptionMailer.sendInvitationEmail(
                email,
                orgName,
                invitation.data.token,
                this.receptionRef.options.baseUrl
              );

              results.push({
                email,
                success: true,
                status: 'invited',
              });
              summary.invited++;
            } catch (error: any) {
              results.push({
                email,
                success: false,
                status: 'error',
                message: error.message || 'Unknown error',
              });
              summary.errors++;
            }
          }

          return { success: true, results, summary };
        }
      )
    );
  }

  /**
   * Find invitation by email
   */
  public async getInvitationByEmail(email: string): Promise<UserInvitation | null> {
    return this.CUserInvitation.getInstance({
      data: { email: email.toLowerCase().trim() },
    });
  }

  /**
   * Get pending invitations for an email (for registration flow)
   */
  public async getPendingInvitationsForEmail(email: string): Promise<UserInvitation | null> {
    const invitation = await this.getInvitationByEmail(email);
    if (invitation && invitation.data.status === 'pending' && !invitation.isExpired()) {
      return invitation;
    }
    return null;
  }

  /**
   * Clean up expired invitations
   */
  public async cleanupExpiredInvitations(): Promise<number> {
    const allInvitations = await this.CUserInvitation.getInstances({
      data: { status: 'pending' },
    });

    let cleanedCount = 0;
    for (const invitation of allInvitations) {
      if (invitation.isExpired()) {
        invitation.data.status = 'expired';
        await invitation.save();
        cleanedCount++;
      }
    }

    return cleanedCount;
  }

  /**
   * Send invitation email
   */
  private async sendInvitationEmail(
    invitation: UserInvitation,
    organizationId: string
  ): Promise<void> {
    const org = await this.receptionRef.organizationmanager.COrganization.getInstance({
      id: organizationId,
    });
    const orgName = org?.data.name || 'an organization';

    await this.receptionRef.receptionMailer.sendInvitationEmail(
      invitation.data.email,
      orgName,
      invitation.data.token,
      this.receptionRef.options.baseUrl
    );
  }

  /**
   * Verify user is admin/owner of organization
   */
  private async verifyUserIsAdminOfOrg(userId: string, organizationId: string): Promise<void> {
    const role = await this.receptionRef.roleManager.CRole.getInstance({
      data: { userId, organizationId },
    });

    if (!role) {
      throw new plugins.typedrequest.TypedResponseError('Not a member of this organization.');
    }

    const hasAdminRole = role.data.roles.some(r =>
      ['owner', 'admin'].includes(r)
    );

    if (!hasAdminRole) {
      throw new plugins.typedrequest.TypedResponseError(
        'You do not have permission to perform this action.'
      );
    }
  }

  /**
   * Verify user is member of organization
   */
  private async verifyUserIsMemberOfOrg(userId: string, organizationId: string): Promise<void> {
    const role = await this.receptionRef.roleManager.CRole.getInstance({
      data: { userId, organizationId },
    });

    if (!role) {
      throw new plugins.typedrequest.TypedResponseError('Not a member of this organization.');
    }
  }

  /**
   * Validate email format
   */
  private isValidEmail(email: string): boolean {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
  }
}