// LICENSE : MIT
"use strict";
import { moduleInterop } from "@textlint/module-interop";
import { TextLintModuleResolver } from "../engine/textlint-module-resolver";
import { normalizeTextlintPresetSubRuleKey } from "@textlint/utils";
import { isPresetRuleKey } from "./config-util";

/**
 * Convert config of preset to rawRulesConfig flat path format.
 *
 * This function convert Preset nesting rule to flat path
 * ```
 * {
 *  "x" : true
 *  "preset-a" : { "rule-name": "value" }
 * }
 * ```
 * =>
 * ```
 * { "x": true }
 * { "a/rule-name": "value" }
 * ```
 *
 * @param rawRulesConfig
 * @returns {{string: string}}
 */
export function createFlatRulesConfigFromRawRulesConfig(rawRulesConfig: any) {
    if (!rawRulesConfig) {
        return {};
    }
    const rulesConfig: { [index: string]: any } = {};
    Object.keys(rawRulesConfig).forEach((key) => {
        if (isPresetRuleKey(key)) {
            // <preset>/<rule>
            const presetName = key;
            const presetRuleConfig = rawRulesConfig[key];
            Object.assign(
                rulesConfig,
                createFlatPresetRulesConfigFromRawPresetRuleConfig(presetRuleConfig, presetName)
            );
            return;
        }
        rulesConfig[key] = rawRulesConfig[key];
    });
    return rulesConfig;
}

/**
 * create flat `<plugin>/<rule>` option
 * @param {Object} [rulesConfig]
 * @param {string} presetName
 * @returns {Object}
 */
export function createFlatPresetRulesConfigFromRawPresetRuleConfig(
    rulesConfig: { [index: string]: string },
    presetName: string
): object {
    const mapped: { [index: string]: string } = {};
    // missing "rulesConfig"
    if (rulesConfig === undefined || typeof rulesConfig !== "object") {
        return mapped;
    }
    Object.keys(rulesConfig).forEach((ruleName) => {
        const normalizedKey = normalizeTextlintPresetSubRuleKey({ preset: presetName, rule: ruleName });
        mapped[normalizedKey] = rulesConfig[ruleName];
    });
    return mapped;
}

const hasOwnProperty = Object.prototype.hasOwnProperty;

/**
 *
 * @param presetNames
 * @param {TextLintModuleResolver} moduleResolver
 * @returns {{}}
 */
export function loadRulesConfigFromPresets(presetNames: string[] = [], moduleResolver: TextLintModuleResolver): {} {
    const presetRulesConfig = {};
    presetNames.forEach((presetName) => {
        const pkgPath = moduleResolver.resolvePresetPackageName(presetName);
        const preset = moduleInterop(require(pkgPath));
        if (!hasOwnProperty.call(preset, "rules")) {
            throw new Error(`${presetName} has not rules`);
        }
        if (!hasOwnProperty.call(preset, "rulesConfig")) {
            throw new Error(`${presetName} has not rulesConfig`);
        }
        // set config of <rule> to "<preset>/<rule>"
        Object.assign(
            presetRulesConfig,
            createFlatPresetRulesConfigFromRawPresetRuleConfig(preset.rulesConfig, presetName)
        );
    });
    return presetRulesConfig;
}