import { HttpParameterCodec } from '@angular/common/http';

export interface ConfigurationParameters {
    /**
     *  @deprecated Since 5.0. Use credentials instead
     */
    apiKeys?: {[ key: string ]: string};
    username?: string;
    password?: string;
    /**
     *  @deprecated Since 5.0. Use credentials instead
     */
    accessToken?: string | (() => string);
    basePath?: string;
    withCredentials?: boolean;
    encoder?: HttpParameterCodec;
    /**
     * The keys are the names in the securitySchemes section of the OpenAPI
     * document. They should map to the value used for authentication
     * minus any standard prefixes such as 'Basic' or 'Bearer'.
     */
    credentials?: {[ key: string ]: string | (() => string | undefined)};
}

export class Configuration {
    /**
     *  @deprecated Since 5.0. Use credentials instead
     */
    apiKeys?: {[ key: string ]: string};
    username?: string;
    password?: string;
    /**
     *  @deprecated Since 5.0. Use credentials instead
     */
    accessToken?: string | (() => string);
    basePath?: string;
    withCredentials?: boolean;
    encoder?: HttpParameterCodec;
    /**
     * The keys are the names in the securitySchemes section of the OpenAPI
     * document. They should map to the value used for authentication
     * minus any standard prefixes such as 'Basic' or 'Bearer'.
     */
    credentials: {[ key: string ]: string | (() => string | undefined)};

    constructor(configurationParameters: ConfigurationParameters = {}) {
        this.apiKeys = configurationParameters.apiKeys;
        this.username = configurationParameters.username;
        this.password = configurationParameters.password;
        this.accessToken = configurationParameters.accessToken;
        this.basePath = configurationParameters.basePath;
        this.withCredentials = configurationParameters.withCredentials;
        this.encoder = configurationParameters.encoder;
        if (configurationParameters.credentials) {
            this.credentials = configurationParameters.credentials;
        }
        else {
            this.credentials = {};
        }

        // init default API_TOKEN credential
        if (!this.credentials['API_TOKEN']) {
            this.credentials['API_TOKEN'] = () => {
                return typeof this.accessToken === 'function'
                    ? this.accessToken()
                    : this.accessToken;
            };
        }
    }

    /**
     * Select the correct content-type to use for a request.
     * Uses {@link Configuration#isJsonMime} to determine the correct content-type.
     * If no content type is found return the first found type if the contentTypes is not empty
     * @param contentTypes - the array of content types that are available for selection
     * @returns the selected content-type or <code>undefined</code> if no selection could be made.
     */
    public selectHeaderContentType (contentTypes: string[]): string | undefined {
        if (contentTypes.length === 0) {
            return undefined;
        }

        const type = contentTypes.find((x: string) => this.isJsonMime(x));
        if (type === undefined) {
            return contentTypes[0];
        }
        return type;
    }

    /**
     * Select the correct accept content-type to use for a request.
     * Uses {@link Configuration#isJsonMime} to determine the correct accept content-type.
     * If no content type is found return the first found type if the contentTypes is not empty
     * @param accepts - the array of content types that are available for selection.
     * @returns the selected content-type or <code>undefined</code> if no selection could be made.
     */
    public selectHeaderAccept(accepts: string[]): string | undefined {
        if (accepts.length === 0) {
            return undefined;
        }

        const type = accepts.find((x: string) => this.isJsonMime(x));
        if (type === undefined) {
            return accepts[0];
        }
        return type;
    }

    /**
     * Check if the given MIME is a JSON MIME.
     * JSON MIME examples:
     *   application/json
     *   application/json; charset=UTF8
     *   APPLICATION/JSON
     *   application/vnd.company+json
     * @param mime - MIME (Multipurpose Internet Mail Extensions)
     * @return True if the given MIME is JSON, false otherwise.
     */
    public isJsonMime(mime: string): boolean {
        const jsonMime: RegExp = new RegExp('^(application\/json|[^;/ \t]+\/[^;/ \t]+[+]json)[ \t]*(;.*)?$', 'i');
        return mime !== null && (jsonMime.test(mime) || mime.toLowerCase() === 'application/json-patch+json');
    }

    public lookupCredential(key: string): string | undefined {
        const value = this.credentials[key];
        return typeof value === 'function'
            ? value()
            : value;
    }
}