import {Authenticatable, AuthenticatableIdentifier} from '../../types'
import {OAuth2LoginConfig} from './OAuth2LoginController'
import {Awaitable, dataGetUnsafe, InvalidJSONStateError, JSONState} from '../../../util'

export class OAuth2User implements Authenticatable {
    protected displayField: string

    protected identifierField: string

    constructor(
        protected data: {[key: string]: any},
        config: OAuth2LoginConfig,
    ) {
        this.displayField = config.userEndpointResponseMapping?.display || 'name'
        this.identifierField = config.userEndpointResponseMapping?.identifier || 'id'
    }

    getDisplayIdentifier(): string {
        return String(dataGetUnsafe(this.data, this.displayField || 'name', ''))
    }

    getIdentifier(): AuthenticatableIdentifier {
        return String(dataGetUnsafe(this.data, this.identifierField || 'id', ''))
    }

    async dehydrate(): Promise<JSONState> {
        return {
            isOAuth2User: true,
            data: this.data,
            displayField: this.displayField,
            identifierField: this.identifierField,
        }
    }

    rehydrate(state: JSONState): Awaitable<void> {
        if (
            !state.isOAuth2User
            || typeof state.data !== 'object'
            || state.data === null
            || typeof state.displayField !== 'string'
            || typeof state.identifierField !== 'string'
        ) {
            throw new InvalidJSONStateError('OAuth2User state is invalid', { state })
        }

        this.data = state.data
        this.identifierField = state.identifierField
        this.displayField = state.identifierField
    }
}