import * as permissions from '../types/permissions';
import User, { IUser } from '../types/user';
import {
    IAccessStore,
    IRole,
    IRoleWithPermissions,
    IUserPermission,
    IUserRole,
} from '../types/stores/access-store';
import { IUserStore } from '../types/stores/user-store';
import { Logger } from '../logger';
import { IUnleashStores } from '../types/stores';
import {
    IAvailablePermissions,
    ICustomRole,
    IPermission,
    IRoleData,
    IUserWithRole,
    RoleName,
    RoleType,
} from '../types/model';
import { IRoleStore } from 'lib/types/stores/role-store';
import NameExistsError from '../error/name-exists-error';
import { IEnvironmentStore } from 'lib/types/stores/environment-store';
import RoleInUseError from '../error/role-in-use-error';
import { roleSchema } from '../schema/role-schema';
import { CUSTOM_ROLE_TYPE } from '../util/constants';
import { DEFAULT_PROJECT } from '../types/project';
import InvalidOperationError from '../error/invalid-operation-error';

export const ALL_PROJECTS = '*';
export const ALL_ENVS = '*';

const { ADMIN } = permissions;

const PROJECT_ADMIN = [
    permissions.UPDATE_PROJECT,
    permissions.DELETE_PROJECT,
    permissions.CREATE_FEATURE,
    permissions.UPDATE_FEATURE,
    permissions.DELETE_FEATURE,
];

interface IRoleCreation {
    name: string;
    description: string;
    permissions?: IPermission[];
}

interface IRoleUpdate {
    id: number;
    name: string;
    description: string;
    permissions?: IPermission[];
}

const isProjectPermission = (permission) => PROJECT_ADMIN.includes(permission);

export class AccessService {
    private store: IAccessStore;

    private userStore: IUserStore;

    private roleStore: IRoleStore;

    private environmentStore: IEnvironmentStore;

    private logger: Logger;

    constructor(
        {
            accessStore,
            userStore,
            roleStore,
            environmentStore,
        }: Pick<
            IUnleashStores,
            'accessStore' | 'userStore' | 'roleStore' | 'environmentStore'
        >,
        { getLogger }: { getLogger: Function },
    ) {
        this.store = accessStore;
        this.userStore = userStore;
        this.roleStore = roleStore;
        this.environmentStore = environmentStore;
        this.logger = getLogger('/services/access-service.ts');
    }

    /**
     * Used to check if a user has access to the requested resource
     *
     * @param user
     * @param permission
     * @param projectId
     */
    async hasPermission(
        user: User,
        permission: string,
        projectId?: string,
        environment?: string,
    ): Promise<boolean> {
        this.logger.info(
            `Checking permission=${permission}, userId=${user.id}, projectId=${projectId}, environment=${environment}`,
        );

        try {
            const userP = await this.getPermissionsForUser(user);

            return userP
                .filter(
                    (p) =>
                        !p.project ||
                        p.project === projectId ||
                        p.project === ALL_PROJECTS,
                )
                .filter(
                    (p) =>
                        !p.environment ||
                        p.environment === environment ||
                        p.environment === ALL_ENVS,
                )
                .some(
                    (p) =>
                        p.permission === permission || p.permission === ADMIN,
                );
        } catch (e) {
            this.logger.error(
                `Error checking permission=${permission}, userId=${user.id} projectId=${projectId}`,
                e,
            );
            return Promise.resolve(false);
        }
    }

    async getPermissionsForUser(user: IUser): Promise<IUserPermission[]> {
        if (user.isAPI) {
            return user.permissions?.map((p) => ({
                permission: p,
            }));
        }
        return this.store.getPermissionsForUser(user.id);
    }

    async getPermissions(): Promise<IAvailablePermissions> {
        const bindablePermissions = await this.store.getAvailablePermissions();
        const environments = await this.environmentStore.getAll();

        const projectPermissions = bindablePermissions.filter((x) => {
            return x.type === 'project';
        });

        const environmentPermissions = bindablePermissions.filter((perm) => {
            return perm.type === 'environment';
        });

        const allEnvironmentPermissions = environments.map((env) => {
            return {
                name: env.name,
                permissions: environmentPermissions.map((permission) => {
                    return { environment: env.name, ...permission };
                }),
            };
        });

        return {
            project: projectPermissions,
            environments: allEnvironmentPermissions,
        };
    }

    async addUserToRole(
        userId: number,
        roleId: number,
        projectId: string,
    ): Promise<void> {
        return this.store.addUserToRole(userId, roleId, projectId);
    }

    async getRoleByName(roleName: string): Promise<IRole> {
        return this.roleStore.getRoleByName(roleName);
    }

    async setUserRootRole(
        userId: number,
        role: number | RoleName,
    ): Promise<void> {
        const newRootRole = await this.resolveRootRole(role);
        if (newRootRole) {
            try {
                await this.store.removeRolesOfTypeForUser(
                    userId,
                    RoleType.ROOT,
                );

                await this.store.addUserToRole(
                    userId,
                    newRootRole.id,
                    DEFAULT_PROJECT,
                );
            } catch (error) {
                throw new Error(
                    `Could not add role=${newRootRole.name} to userId=${userId}`,
                );
            }
        } else {
            throw new Error(`Could not find rootRole=${role}`);
        }
    }

    async getUserRootRoles(userId: number): Promise<IRole[]> {
        const userRoles = await this.store.getRolesForUserId(userId);
        return userRoles.filter((r) => r.type === RoleType.ROOT);
    }

    async removeUserFromRole(
        userId: number,
        roleId: number,
        projectId: string,
    ): Promise<void> {
        return this.store.removeUserFromRole(userId, roleId, projectId);
    }

    async updateUserProjectRole(
        userId: number,
        roleId: number,
        projectId: string,
    ): Promise<void> {
        return this.store.updateUserProjectRole(userId, roleId, projectId);
    }

    //This actually only exists for testing purposes
    async addPermissionToRole(
        roleId: number,
        permission: string,
        environment?: string,
    ): Promise<void> {
        if (isProjectPermission(permission) && !environment) {
            throw new Error(
                `ProjectId cannot be empty for permission=${permission}`,
            );
        }
        return this.store.addPermissionsToRole(
            roleId,
            [permission],
            environment,
        );
    }

    //This actually only exists for testing purposes
    async removePermissionFromRole(
        roleId: number,
        permission: string,
        environment?: string,
    ): Promise<void> {
        if (isProjectPermission(permission) && !environment) {
            throw new Error(
                `ProjectId cannot be empty for permission=${permission}`,
            );
        }
        return this.store.removePermissionFromRole(
            roleId,
            permission,
            environment,
        );
    }

    async getRoles(): Promise<IRole[]> {
        return this.roleStore.getRoles();
    }

    async getRole(id: number): Promise<IRoleWithPermissions> {
        const role = await this.store.get(id);
        const rolePermissions = await this.store.getPermissionsForRole(role.id);
        return {
            ...role,
            permissions: rolePermissions,
        };
    }

    async getRoleData(roleId: number): Promise<IRoleData> {
        const [role, rolePerms, users] = await Promise.all([
            this.store.get(roleId),
            this.store.getPermissionsForRole(roleId),
            this.getUsersForRole(roleId),
        ]);
        return { role, permissions: rolePerms, users };
    }

    async getProjectRoles(): Promise<IRole[]> {
        return this.roleStore.getProjectRoles();
    }

    async getRolesForProject(projectId: string): Promise<IRole[]> {
        return this.roleStore.getRolesForProject(projectId);
    }

    async getRolesForUser(userId: number): Promise<IRole[]> {
        return this.store.getRolesForUserId(userId);
    }

    async unlinkUserRoles(userId: number): Promise<void> {
        return this.store.unlinkUserRoles(userId);
    }

    async getUsersForRole(roleId: number): Promise<IUser[]> {
        const userIdList = await this.store.getUserIdsForRole(roleId);
        if (userIdList.length > 0) {
            return this.userStore.getAllWithId(userIdList);
        }
        return [];
    }

    async getProjectUsersForRole(
        roleId: number,
        projectId?: string,
    ): Promise<IUser[]> {
        const userIdList = await this.store.getProjectUserIdsForRole(
            roleId,
            projectId,
        );
        if (userIdList.length > 0) {
            return this.userStore.getAllWithId(userIdList);
        }
        return [];
    }

    // Move to project-service?
    async getProjectRoleUsers(
        projectId: string,
    ): Promise<[IRole[], IUserWithRole[]]> {
        const roles = await this.roleStore.getProjectRoles();

        const users = await Promise.all(
            roles.map(async (role) => {
                const projectUsers = await this.getProjectUsersForRole(
                    role.id,
                    projectId,
                );
                return projectUsers.map((u) => ({ ...u, roleId: role.id }));
            }),
        );
        return [roles, users.flat()];
    }

    async createDefaultProjectRoles(
        owner: IUser,
        projectId: string,
    ): Promise<void> {
        if (!projectId) {
            throw new Error('ProjectId cannot be empty');
        }

        const ownerRole = await this.roleStore.getRoleByName(RoleName.OWNER);

        // TODO: remove this when all users is guaranteed to have a unique id.
        if (owner.id) {
            this.logger.info(
                `Making ${owner.id} admin of ${projectId} via roleId=${ownerRole.id}`,
            );
            await this.store.addUserToRole(owner.id, ownerRole.id, projectId);
        }
    }

    async removeDefaultProjectRoles(
        owner: User,
        projectId: string,
    ): Promise<void> {
        this.logger.info(`Removing project roles for ${projectId}`);
        return this.roleStore.removeRolesForProject(projectId);
    }

    async getRootRoleForAllUsers(): Promise<IUserRole[]> {
        return this.roleStore.getRootRoleForAllUsers();
    }

    async getRootRoles(): Promise<IRole[]> {
        return this.roleStore.getRootRoles();
    }

    public async resolveRootRole(rootRole: number | RoleName): Promise<IRole> {
        const rootRoles = await this.getRootRoles();
        let role: IRole;
        if (typeof rootRole === 'number') {
            role = rootRoles.find((r) => r.id === rootRole);
        } else {
            role = rootRoles.find((r) => r.name === rootRole);
        }
        return role;
    }

    async getRootRole(roleName: RoleName): Promise<IRole> {
        const roles = await this.roleStore.getRootRoles();
        return roles.find((r) => r.name === roleName);
    }

    async getAllRoles(): Promise<ICustomRole[]> {
        return this.roleStore.getAll();
    }

    async createRole(role: IRoleCreation): Promise<ICustomRole> {
        const baseRole = {
            ...(await this.validateRole(role)),
            roleType: CUSTOM_ROLE_TYPE,
        };

        const rolePermissions = role.permissions;
        const newRole = await this.roleStore.create(baseRole);
        if (rolePermissions) {
            this.store.addEnvironmentPermissionsToRole(
                newRole.id,
                rolePermissions,
            );
        }
        return newRole;
    }

    async updateRole(role: IRoleUpdate): Promise<ICustomRole> {
        await this.validateRole(role, role.id);
        const baseRole = {
            id: role.id,
            name: role.name,
            description: role.description,
            roleType: CUSTOM_ROLE_TYPE,
        };
        const rolePermissions = role.permissions;
        const newRole = await this.roleStore.update(baseRole);
        if (rolePermissions) {
            this.store.wipePermissionsFromRole(newRole.id);
            this.store.addEnvironmentPermissionsToRole(
                newRole.id,
                rolePermissions,
            );
        }
        return newRole;
    }

    async deleteRole(id: number): Promise<void> {
        await this.validateRoleIsNotBuiltIn(id);

        const roleUsers = await this.getUsersForRole(id);

        if (roleUsers.length > 0) {
            throw new RoleInUseError(
                'Role is in use by more than one user. You cannot delete a role that is in use without first removing the role from the users.',
            );
        }

        return this.roleStore.delete(id);
    }

    async validateRoleIsUnique(
        roleName: string,
        existingId?: number,
    ): Promise<void> {
        const exists = await this.roleStore.nameInUse(roleName, existingId);
        if (exists) {
            throw new NameExistsError(
                `There already exists a role with the name ${roleName}`,
            );
        }
        return Promise.resolve();
    }

    async validateRoleIsNotBuiltIn(roleId: number): Promise<void> {
        const role = await this.store.get(roleId);
        if (role.type !== CUSTOM_ROLE_TYPE) {
            throw new InvalidOperationError(
                'You cannot change built in roles.',
            );
        }
    }

    async validateRole(
        role: IRoleCreation,
        existingId?: number,
    ): Promise<IRoleCreation> {
        const cleanedRole = await roleSchema.validateAsync(role);
        if (existingId) {
            await this.validateRoleIsNotBuiltIn(existingId);
        }
        await this.validateRoleIsUnique(role.name, existingId);
        return cleanedRole;
    }
}