import isPlainObject from 'is-plain-object';
import { getUserAgent } from 'universal-user-agent';

function lowercaseKeys(object) {
    if (!object) {
        return {};
    }
    return Object.keys(object).reduce((newObj, key) => {
        newObj[key.toLowerCase()] = object[key];
        return newObj;
    }, {});
}

function mergeDeep(defaults, options) {
    const result = Object.assign({}, defaults);
    Object.keys(options).forEach(key => {
        if (isPlainObject(options[key])) {
            if (!(key in defaults))
                Object.assign(result, { [key]: options[key] });
            else
                result[key] = mergeDeep(defaults[key], options[key]);
        }
        else {
            Object.assign(result, { [key]: options[key] });
        }
    });
    return result;
}

function merge(defaults, route, options) {
    if (typeof route === "string") {
        let [method, url] = route.split(" ");
        options = Object.assign(url ? { method, url } : { url: method }, options);
    }
    else {
        options = route || {};
    }
    // lowercase header names before merging with defaults to avoid duplicates
    options.headers = lowercaseKeys(options.headers);
    const mergedOptions = mergeDeep(defaults || {}, options);
    // mediaType.previews arrays are merged, instead of overwritten
    if (defaults && defaults.mediaType.previews.length) {
        mergedOptions.mediaType.previews = defaults.mediaType.previews
            .filter(preview => !mergedOptions.mediaType.previews.includes(preview))
            .concat(mergedOptions.mediaType.previews);
    }
    mergedOptions.mediaType.previews = mergedOptions.mediaType.previews.map((preview) => preview.replace(/-preview/, ""));
    return mergedOptions;
}

function addQueryParameters(url, parameters) {
    const separator = /\?/.test(url) ? "&" : "?";
    const names = Object.keys(parameters);
    if (names.length === 0) {
        return url;
    }
    return (url +
        separator +
        names
            .map(name => {
            if (name === "q") {
                return ("q=" +
                    parameters
                        .q.split("+")
                        .map(encodeURIComponent)
                        .join("+"));
            }
            return `${name}=${encodeURIComponent(parameters[name])}`;
        })
            .join("&"));
}

const urlVariableRegex = /\{[^}]+\}/g;
function removeNonChars(variableName) {
    return variableName.replace(/^\W+|\W+$/g, "").split(/,/);
}
function extractUrlVariableNames(url) {
    const matches = url.match(urlVariableRegex);
    if (!matches) {
        return [];
    }
    return matches.map(removeNonChars).reduce((a, b) => a.concat(b), []);
}

function omit(object, keysToOmit) {
    return Object.keys(object)
        .filter(option => !keysToOmit.includes(option))
        .reduce((obj, key) => {
        obj[key] = object[key];
        return obj;
    }, {});
}

// Based on https://github.com/bramstein/url-template, licensed under BSD
// TODO: create separate package.
//
// Copyright (c) 2012-2014, Bram Stein
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//  3. The name of the author may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/* istanbul ignore file */
function encodeReserved(str) {
    return str
        .split(/(%[0-9A-Fa-f]{2})/g)
        .map(function (part) {
        if (!/%[0-9A-Fa-f]/.test(part)) {
            part = encodeURI(part)
                .replace(/%5B/g, "[")
                .replace(/%5D/g, "]");
        }
        return part;
    })
        .join("");
}
function encodeUnreserved(str) {
    return encodeURIComponent(str).replace(/[!'()*]/g, function (c) {
        return ("%" +
            c
                .charCodeAt(0)
                .toString(16)
                .toUpperCase());
    });
}
function encodeValue(operator, value, key) {
    value =
        operator === "+" || operator === "#"
            ? encodeReserved(value)
            : encodeUnreserved(value);
    if (key) {
        return encodeUnreserved(key) + "=" + value;
    }
    else {
        return value;
    }
}
function isDefined(value) {
    return value !== undefined && value !== null;
}
function isKeyOperator(operator) {
    return operator === ";" || operator === "&" || operator === "?";
}
function getValues(context, operator, key, modifier) {
    var value = context[key], result = [];
    if (isDefined(value) && value !== "") {
        if (typeof value === "string" ||
            typeof value === "number" ||
            typeof value === "boolean") {
            value = value.toString();
            if (modifier && modifier !== "*") {
                value = value.substring(0, parseInt(modifier, 10));
            }
            result.push(encodeValue(operator, value, isKeyOperator(operator) ? key : ""));
        }
        else {
            if (modifier === "*") {
                if (Array.isArray(value)) {
                    value.filter(isDefined).forEach(function (value) {
                        result.push(encodeValue(operator, value, isKeyOperator(operator) ? key : ""));
                    });
                }
                else {
                    Object.keys(value).forEach(function (k) {
                        if (isDefined(value[k])) {
                            result.push(encodeValue(operator, value[k], k));
                        }
                    });
                }
            }
            else {
                const tmp = [];
                if (Array.isArray(value)) {
                    value.filter(isDefined).forEach(function (value) {
                        tmp.push(encodeValue(operator, value));
                    });
                }
                else {
                    Object.keys(value).forEach(function (k) {
                        if (isDefined(value[k])) {
                            tmp.push(encodeUnreserved(k));
                            tmp.push(encodeValue(operator, value[k].toString()));
                        }
                    });
                }
                if (isKeyOperator(operator)) {
                    result.push(encodeUnreserved(key) + "=" + tmp.join(","));
                }
                else if (tmp.length !== 0) {
                    result.push(tmp.join(","));
                }
            }
        }
    }
    else {
        if (operator === ";") {
            if (isDefined(value)) {
                result.push(encodeUnreserved(key));
            }
        }
        else if (value === "" && (operator === "&" || operator === "?")) {
            result.push(encodeUnreserved(key) + "=");
        }
        else if (value === "") {
            result.push("");
        }
    }
    return result;
}
function parseUrl(template) {
    return {
        expand: expand.bind(null, template)
    };
}
function expand(template, context) {
    var operators = ["+", "#", ".", "/", ";", "?", "&"];
    return template.replace(/\{([^\{\}]+)\}|([^\{\}]+)/g, function (_, expression, literal) {
        if (expression) {
            let operator = "";
            const values = [];
            if (operators.indexOf(expression.charAt(0)) !== -1) {
                operator = expression.charAt(0);
                expression = expression.substr(1);
            }
            expression.split(/,/g).forEach(function (variable) {
                var tmp = /([^:\*]*)(?::(\d+)|(\*))?/.exec(variable);
                values.push(getValues(context, operator, tmp[1], tmp[2] || tmp[3]));
            });
            if (operator && operator !== "+") {
                var separator = ",";
                if (operator === "?") {
                    separator = "&";
                }
                else if (operator !== "#") {
                    separator = operator;
                }
                return (values.length !== 0 ? operator : "") + values.join(separator);
            }
            else {
                return values.join(",");
            }
        }
        else {
            return encodeReserved(literal);
        }
    });
}

function parse(options) {
    // https://fetch.spec.whatwg.org/#methods
    let method = options.method.toUpperCase();
    // replace :varname with {varname} to make it RFC 6570 compatible
    let url = options.url.replace(/:([a-z]\w+)/g, "{+$1}");
    let headers = Object.assign({}, options.headers);
    let body;
    let parameters = omit(options, [
        "method",
        "baseUrl",
        "url",
        "headers",
        "request",
        "mediaType"
    ]);
    // extract variable names from URL to calculate remaining variables later
    const urlVariableNames = extractUrlVariableNames(url);
    url = parseUrl(url).expand(parameters);
    if (!/^http/.test(url)) {
        url = options.baseUrl + url;
    }
    const omittedParameters = Object.keys(options)
        .filter(option => urlVariableNames.includes(option))
        .concat("baseUrl");
    const remainingParameters = omit(parameters, omittedParameters);
    const isBinaryRequset = /application\/octet-stream/i.test(headers.accept);
    if (!isBinaryRequset) {
        if (options.mediaType.format) {
            // e.g. application/vnd.github.v3+json => application/vnd.github.v3.raw
            headers.accept = headers.accept
                .split(/,/)
                .map(preview => preview.replace(/application\/vnd(\.\w+)(\.v3)?(\.\w+)?(\+json)?$/, `application/vnd$1$2.${options.mediaType.format}`))
                .join(",");
        }
        if (options.mediaType.previews.length) {
            const previewsFromAcceptHeader = headers.accept.match(/[\w-]+(?=-preview)/g) || [];
            headers.accept = previewsFromAcceptHeader
                .concat(options.mediaType.previews)
                .map(preview => {
                const format = options.mediaType.format
                    ? `.${options.mediaType.format}`
                    : "+json";
                return `application/vnd.github.${preview}-preview${format}`;
            })
                .join(",");
        }
    }
    // for GET/HEAD requests, set URL query parameters from remaining parameters
    // for PATCH/POST/PUT/DELETE requests, set request body from remaining parameters
    if (["GET", "HEAD"].includes(method)) {
        url = addQueryParameters(url, remainingParameters);
    }
    else {
        if ("data" in remainingParameters) {
            body = remainingParameters.data;
        }
        else {
            if (Object.keys(remainingParameters).length) {
                body = remainingParameters;
            }
            else {
                headers["content-length"] = 0;
            }
        }
    }
    // default content-type for JSON if body is set
    if (!headers["content-type"] && typeof body !== "undefined") {
        headers["content-type"] = "application/json; charset=utf-8";
    }
    // GitHub expects 'content-length: 0' header for PUT/PATCH requests without body.
    // fetch does not allow to set `content-length` header, but we can set body to an empty string
    if (["PATCH", "PUT"].includes(method) && typeof body === "undefined") {
        body = "";
    }
    // Only return body/request keys if present
    return Object.assign({ method, url, headers }, typeof body !== "undefined" ? { body } : null, options.request ? { request: options.request } : null);
}

function endpointWithDefaults(defaults, route, options) {
    return parse(merge(defaults, route, options));
}

function withDefaults(oldDefaults, newDefaults) {
    const DEFAULTS = merge(oldDefaults, newDefaults);
    const endpoint = endpointWithDefaults.bind(null, DEFAULTS);
    return Object.assign(endpoint, {
        DEFAULTS,
        defaults: withDefaults.bind(null, DEFAULTS),
        merge: merge.bind(null, DEFAULTS),
        parse
    });
}

const VERSION = "0.0.0-development";

const userAgent = `octokit-endpoint.js/${VERSION} ${getUserAgent()}`;
const DEFAULTS = {
    method: "GET",
    baseUrl: "https://api.github.com",
    headers: {
        accept: "application/vnd.github.v3+json",
        "user-agent": userAgent
    },
    mediaType: {
        format: "",
        previews: []
    }
};

const endpoint = withDefaults(null, DEFAULTS);

export { endpoint };
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