import { DynamicModule, Module, Global, Provider } from '@nestjs/common';
import { HttpModule, HttpService } from '@nestjs/axios';
import { AsyncConfiguration, Configuration, ConfigurationFactory } from './configuration';

import { DefaultRotowireNbaApiService } from './api/default.service';

//@Global()
@Module({
    imports: [HttpModule],
    exports: [
        DefaultRotowireNbaApiService
    ],
    providers: [
        DefaultRotowireNbaApiService
    ]
})
export class ApiModule {
    public static forRoot(configurationFactory: () => Configuration): DynamicModule {
        return {
            module: ApiModule,
            providers: [{ provide: Configuration, useFactory: configurationFactory }]
        };
    }

    /**
     * Register the module asynchronously.
     */
    static forRootAsync(options: AsyncConfiguration): DynamicModule {
        const providers = [...this.createAsyncProviders(options)];
        return {
            module: ApiModule,
            imports: options.imports || [],
            providers,
            exports: providers,
        };
    }

    private static createAsyncProviders(options: AsyncConfiguration): Provider[] {
        if (options.useExisting || options.useFactory) {
            return [this.createAsyncConfigurationProvider(options)];
        }
        return [
            this.createAsyncConfigurationProvider(options),
            {
                provide: options.useClass,
                useClass: options.useClass,
            },
        ];
    }

    private static createAsyncConfigurationProvider(
        options: AsyncConfiguration,
    ): Provider {
        if (options.useFactory) {
            return {
                provide: Configuration,
                useFactory: options.useFactory,
                inject: options.inject || [],
            };
        }
        return {
            provide: Configuration,
            useFactory: async (optionsFactory: ConfigurationFactory) =>
                await optionsFactory.createConfiguration(),
            inject: [options.useExisting || options.useClass],
        };
    }

    constructor(httpService: HttpService) { }
}