import { Plugin } from '@nocobase/server';
import { resolve } from 'path';
import { availableActionResource } from './actions/available-actions';
import { roleCollectionsResource } from './actions/role-collections';
import { RoleResourceActionModel } from './model/RoleResourceActionModel';
import { RoleResourceModel } from './model/RoleResourceModel';
import { RoleModel } from './model/RoleModel';

export interface AssociationFieldAction {
  associationActions: string[];
  targetActions?: string[];
}

interface AssociationFieldActions {
  [availableActionName: string]: AssociationFieldAction;
}

export interface AssociationFieldsActions {
  [associationType: string]: AssociationFieldActions;
}

export class GrantHelper {
  resourceTargetActionMap = new Map<string, string[]>();
  targetActionResourceMap = new Map<string, string[]>();

  constructor() {}
}

export class PluginACL extends Plugin {
  associationFieldsActions: AssociationFieldsActions = {};

  grantHelper = new GrantHelper();

  get acl() {
    return this.app.acl;
  }

  registerAssociationFieldAction(associationType: string, value: AssociationFieldActions) {
    this.associationFieldsActions[associationType] = value;
  }

  registerAssociationFieldsActions() {
    this.registerAssociationFieldAction('linkTo', {
      view: {
        associationActions: ['list', 'get'],
      },
      create: {
        associationActions: ['add'],
        targetActions: ['view'],
      },
      update: {
        associationActions: ['add', 'remove', 'toggle'],
        targetActions: ['view'],
      },
    });

    this.registerAssociationFieldAction('attachments', {
      view: {
        associationActions: ['list', 'get'],
      },
      add: {
        associationActions: ['upload', 'add'],
      },
      update: {
        associationActions: ['update', 'add', 'remove', 'toggle'],
      },
    });

    this.registerAssociationFieldAction('subTable', {
      view: {
        associationActions: ['list', 'get'],
      },
      create: {
        associationActions: ['create'],
      },
      update: {
        associationActions: ['update', 'destroy'],
      },
    });
  }

  async writeResourceToACL(resourceModel: RoleResourceModel, transaction) {
    await resourceModel.writeToACL({
      acl: this.acl,
      associationFieldsActions: this.associationFieldsActions,
      transaction: transaction,
      grantHelper: this.grantHelper,
    });
  }

  async writeActionToACL(actionModel: RoleResourceActionModel, transaction) {
    const resource = actionModel.get('resource') as RoleResourceModel;
    const role = this.acl.getRole(resource.get('roleName') as string);
    await actionModel.writeToACL({
      acl: this.acl,
      role,
      resourceName: resource.get('name') as string,
      associationFieldsActions: this.associationFieldsActions,
      grantHelper: this.grantHelper,
    });
  }

  async writeRolesToACL() {
    const roles = (await this.app.db.getRepository('roles').find({
      appends: ['resources', 'resources.actions'],
    })) as RoleModel[];
    for (const role of roles) {
      role.writeToAcl({ acl: this.acl });
      for (const resource of role.get('resources') as RoleResourceModel[]) {
        await this.writeResourceToACL(resource, null);
      }
    }
  }

  async beforeLoad() {
    this.app.db.registerModels({
      RoleResourceActionModel,
      RoleResourceModel,
      RoleModel,
    });

    this.registerAssociationFieldsActions();

    this.app.resourcer.define(availableActionResource);
    this.app.resourcer.define(roleCollectionsResource);

    this.app.db.on('roles.afterSave', async (model, options) => {
      const { transaction } = options;

      model.writeToAcl({
        acl: this.acl,
      });

      // model is default
      if (model.get('default')) {
        await this.app.db.getRepository('roles').update({
          values: {
            default: false,
          },
          filter: {
            'name.$ne': model.get('name'),
          },
          hooks: false,
          transaction,
        });
      }
    });

    this.app.db.on('roles.afterDestroy', (model) => {
      const roleName = model.get('name');
      this.acl.removeRole(roleName);
    });

    this.app.db.on('rolesResources.afterSaveWithAssociations', async (model: RoleResourceModel, options) => {
      await this.writeResourceToACL(model, options.transaction);
    });

    this.app.db.on('rolesResourcesActions.afterUpdateWithAssociations', async (model, options) => {
      const { transaction } = options;
      const resource = await model.getResource({
        transaction,
      });

      await this.writeResourceToACL(resource, transaction);
    });

    this.app.db.on('rolesResources.afterDestroy', async (model, options) => {
      const role = this.acl.getRole(model.get('roleName'));
      role.revokeResource(model.get('name'));
    });

    this.app.db.on('collections.afterDestroy', async (model, options) => {
      const { transaction } = options;
      await this.app.db.getRepository('rolesResources').destroy({
        filter: {
          name: model.get('name'),
        },
        transaction,
      });
    });

    this.app.db.on('fields.afterCreate', async (model, options) => {
      const { transaction } = options;

      const collectionName = model.get('collectionName');
      const fieldName = model.get('name');

      const resourceActions = (await this.app.db.getRepository('rolesResourcesActions').find({
        filter: {
          'resource.name': collectionName,
        },
        transaction,
        appends: ['resource'],
      })) as RoleResourceActionModel[];

      for (const resourceAction of resourceActions) {
        const fields = resourceAction.get('fields') as string[];
        const newFields = [...fields, fieldName];

        await this.app.db.getRepository('rolesResourcesActions').update({
          filterByTk: resourceAction.get('id') as number,
          values: {
            fields: newFields,
          },
          transaction,
        });
      }
    });

    this.app.db.on('fields.afterDestroy', async (model, options) => {
      const collectionName = model.get('collectionName');
      const fieldName = model.get('name');

      const resourceActions = await this.app.db.getRepository('rolesResourcesActions').find({
        filter: {
          'resource.name': collectionName,
          'fields.$anyOf': [fieldName],
        },
        transaction: options.transaction,
      });

      for (const resourceAction of resourceActions) {
        const fields = resourceAction.get('fields') as string[];
        const newFields = fields.filter((field) => field != fieldName);

        await this.app.db.getRepository('rolesResourcesActions').update({
          filterByTk: resourceAction.get('id') as number,
          values: {
            fields: newFields,
          },
          transaction: options.transaction,
        });
      }
    });

    // sync database role data to acl
    this.app.on('beforeStart', async () => {
      await this.writeRolesToACL();
    });
  }

  async load() {
    await this.app.db.import({
      directory: resolve(__dirname, 'collections'),
    });

    this.app.resourcer.use(this.acl.middleware());
  }
}

export default PluginACL;