import axios, { AxiosInstance } from 'axios';
import { store } from '@/state';
import { Model } from '@/api/definitions';

const http: AxiosInstance = axios.create({
    timeout: 20000,
    headers: {
        'X-Requested-With': 'XMLHttpRequest',
        Accept: 'application/json',
        'Content-Type': 'application/json',
    },
});

http.interceptors.request.use(req => {
    const cookies = document.cookie.split(';').reduce((obj, val) => {
        const [ key, value ] = val.trim().split('=').map(decodeURIComponent);

        return { ...obj, [key]: value };
    }, {} as Record<string, string>);

    req.headers['X-XSRF-TOKEN'] = cookies['XSRF-TOKEN'] || 'nil';

    return req;
});

http.interceptors.request.use(req => {
    if (!req.url?.endsWith('/resources')) {
        store.getActions().progress.startContinuous();
    }

    return req;
});

http.interceptors.response.use(resp => {
    if (!resp.request?.url?.endsWith('/resources')) {
        store.getActions().progress.setComplete();
    }

    return resp;
}, error => {
    store.getActions().progress.setComplete();

    throw error;
});

export default http;

/**
 * Converts an error into a human readable response. Mostly just a generic helper to
 * make sure we display the message from the server back to the user if we can.
 */
export function httpErrorToHuman (error: any): string {
    if (error.response && error.response.data) {
        let { data } = error.response;

        // Some non-JSON requests can still return the error as a JSON block. In those cases, attempt
        // to parse it into JSON so we can display an actual error.
        if (typeof data === 'string') {
            try {
                data = JSON.parse(data);
            } catch (e) {
                // do nothing, bad json
            }
        }

        if (data.errors && data.errors[0] && data.errors[0].detail) {
            return data.errors[0].detail;
        }

        // Errors from wings directory, mostly just for file uploads.
        if (data.error && typeof data.error === 'string') {
            return data.error;
        }
    }

    return error.message;
}

export interface FractalResponseData {
    object: string;
    attributes: {
        [k: string]: any;
        relationships?: Record<string, FractalResponseData | FractalResponseList>;
    };
}

export interface FractalResponseList {
    object: 'list';
    data: FractalResponseData[];
}

export interface FractalPaginatedResponse extends FractalResponseList {
    meta: {
        pagination: {
            total: number;
            count: number;
            /* eslint-disable camelcase */
            per_page: number;
            current_page: number;
            total_pages: number;
            /* eslint-enable camelcase */
        };
    };
}

export interface PaginatedResult<T> {
    items: T[];
    pagination: PaginationDataSet;
}

export interface PaginationDataSet {
    total: number;
    count: number;
    perPage: number;
    currentPage: number;
    totalPages: number;
}

export function getPaginationSet (data: any): PaginationDataSet {
    return {
        total: data.total,
        count: data.count,
        perPage: data.per_page,
        currentPage: data.current_page,
        totalPages: data.total_pages,
    };
}

type QueryBuilderFilterValue = string | number | boolean | null;

export interface QueryBuilderParams<FilterKeys extends string = string, SortKeys extends string = string> {
    filters?: {
        [K in FilterKeys]?: QueryBuilderFilterValue | Readonly<QueryBuilderFilterValue[]>;
    };
    sorts?: {
        [K in SortKeys]?: -1 | 0 | 1 | 'asc' | 'desc' | null;
    };
}

/**
 * Helper function that parses a data object provided and builds query parameters
 * for the Laravel Query Builder package automatically. This will apply sorts and
 * filters deterministically based on the provided values.
 */
export const withQueryBuilderParams = (data?: QueryBuilderParams): Record<string, unknown> => {
    if (!data) return {};

    const filters = Object.keys(data.filters || {}).reduce((obj, key) => {
        const value = data.filters?.[key];

        return !value || value === '' ? obj : { ...obj, [`filter[${key}]`]: value };
    }, {} as NonNullable<QueryBuilderParams['filters']>);

    const sorts = Object.keys(data.sorts || {}).reduce((arr, key) => {
        const value = data.sorts?.[key];
        if (!value || ![ 'asc', 'desc', 1, -1 ].includes(value)) {
            return arr;
        }

        return [ ...arr, (value === -1 || value === 'desc' ? '-' : '') + key ];
    }, [] as string[]);

    return {
        ...filters,
        sorts: !sorts.length ? undefined : sorts.join(','),
    };
};

type TransformerFunc = (data: FractalResponseData) => Model;

export const toPaginatedSet = <T extends TransformerFunc> (
    response: FractalPaginatedResponse,
    transformer: T,
): PaginatedResult<ReturnType<T>> => ({
        items: response.data.map(transformer) as ReturnType<T>[],
        pagination: getPaginationSet(response.meta.pagination),
    });