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/*
 * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
 * Copyright 2018 SmartBear Software
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.openapitools.codegen.cmd;

import io.airlift.airline.Command;
import io.airlift.airline.Option;

import io.swagger.parser.OpenAPIParser;
import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.parser.core.models.SwaggerParseResult;
import org.openapitools.codegen.utils.ModelUtils;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

@Command(name = "validate", description = "Validate specification")
public class Validate implements Runnable {

    @Option(name = {"-i", "--input-spec"}, title = "spec file", required = true,
            description = "location of the OpenAPI spec, as URL or file (required)")
    private String spec;

    @Option(name = { "--recommend"}, title = "recommend spec improvements")
    private Boolean recommend;

    @Override
    public void run() {
        System.out.println("Validating spec (" + spec + ")");

        SwaggerParseResult result = new OpenAPIParser().readLocation(spec, null, null);
        List messageList = result.getMessages();
        Set errors = new HashSet(messageList);
        Set warnings = new HashSet();

        StringBuilder sb = new StringBuilder();
        OpenAPI specification = result.getOpenAPI();

        if (Boolean.TRUE.equals(recommend)) {
            if (specification != null) {
                // Add information about unused models to the warnings set.
                List unusedModels = ModelUtils.getUnusedSchemas(specification);
                if (unusedModels != null) {
                    unusedModels.forEach(name -> warnings.add("Unused model: " + name));
                }
            }
        }

        if (errors.size() > 0) {
            sb.append("Errors:").append(System.lineSeparator());
            errors.forEach(msg ->
                    sb.append("\t-").append(msg).append(System.lineSeparator())
            );
        }

        if (!warnings.isEmpty()) {
            sb.append("Warnings: ").append(System.lineSeparator());
            warnings.forEach(msg ->
                    sb.append("\t-").append(msg).append(System.lineSeparator())
            );
        }

        if (!errors.isEmpty()) {
            sb.append(System.lineSeparator());
            sb.append("[error] Spec has ").append(errors.size()).append(" errors.");
            System.err.println(sb.toString());
            System.exit(1);
        } else if (!warnings.isEmpty()) {
            sb.append(System.lineSeparator());
            sb.append("[info] Spec has ").append(warnings.size()).append(" recommendation(s).");
        } else {
            // we say "issues" here rather than "errors" to account for both errors and issues.
            sb.append("No validation issues detected.");
        }

        System.out.println(sb.toString());
    }
}