/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as eslint from 'eslint';
const noBadGDPRComment: eslint.Rule.RuleModule = {
    create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
        return {
            ['Program'](node) {
                for (const comment of (node as eslint.AST.Program).comments) {
                    if (comment.type !== 'Block' || !comment.loc) {
                        continue;
                    }
                    if (!comment.value.includes('__GDPR__')) {
                        continue;
                    }

                    const dataStart = comment.value.indexOf('\n');
                    const data = comment.value.substring(dataStart);

                    let gdprData: { [key: string]: object } | undefined;

                    try {
                        const jsonRaw = `{ ${data} }`;
                        gdprData = JSON.parse(jsonRaw);
                    } catch (e) {
                        context.report({
                            loc: { start: comment.loc.start, end: comment.loc.end },
                            message: 'GDPR comment is not valid JSON',
                        });
                    }

                    if (gdprData) {
                        const len = Object.keys(gdprData).length;
                        if (len !== 1) {
                            context.report({
                                loc: { start: comment.loc.start, end: comment.loc.end },
                                message: `GDPR comment must contain exactly one key, not ${Object.keys(gdprData).join(
                                    ', ',
                                )}`,
                            });
                        }
                    }
                }
            },
        };
    },
};

module.exports = {
    rules: {
        'no-bad-gdpr-comment': noBadGDPRComment, // Ensure correct structure
    },
};