package com.rthoni.intellij.codefromds.business;

import com.intellij.database.psi.DbDataSource;
import com.intellij.openapi.project.Project;
import com.rthoni.intellij.codefromds.dbo.GenerateOptions;
import com.rthoni.intellij.codefromds.dbo.TableSelection;
import org.json.JSONObject;
import org.jtwig.JtwigModel;
import org.jtwig.JtwigTemplate;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;

/**
 * Created by robin on 11/15/16.
 */
public abstract class Generator {

    public static void saveOptions(GenerateOptions options) throws Exception
    {
        HashMap<String, Object> map = options.toMap();
        JSONObject obj = new JSONObject(map);
        FileOutputStream file = new FileOutputStream(options.getConfigAbsolutePath());
        file.write(obj.toString(4).getBytes());
        file.close();
    }

    public static GenerateOptions loadOptions(String configPath) throws Exception
    {
        String data = Files.readAllLines(Paths.get(configPath), StandardCharsets.UTF_8).stream().reduce("", (s1, s2) -> s1 + s2 + "\n");

        JSONObject obj = new JSONObject(data);
        String src = obj.getJSONObject("selection").getString("source");

        DbDataSource dataSource = Helper.findDataSource(src);
        if (dataSource == null) {
            throw new Exception("Data source " + src + " not found");
        }

        GenerateOptions options = new GenerateOptions(dataSource);
        options.setConfigAbsolutePath(configPath);
        options.fromJson(obj);
        return options;
    }

    public static void generateFile(String templatePath, String outputFile, GenerateOptions options, TableSelection table) throws IOException
    {
        String data = Helper.readFile(templatePath);

        FileOutputStream file = new FileOutputStream(outputFile);

        JtwigTemplate template = JtwigTemplate.inlineTemplate(data);
        JtwigModel model = JtwigModel.newModel().with("options", options).with("table", table);

        template.render(model, file);

        file.close();
    }

    public static void generate(GenerateOptions options, Project project) throws IOException
    {
        String modelsAbsolutePath = Helper.getAbsolutePath(project, options.getModelsRelativePath());
        String dataSourceTemplateAbsolutePath = Helper.getAbsolutePath(project, options.getDataSourceTemplateRelativePath());
        String modelsTemplateAbsolutePath = Helper.getAbsolutePath(project, options.getModelsTemplateRelativePath());

        generateFile(dataSourceTemplateAbsolutePath, modelsAbsolutePath + File.separator +
                "Database." + options.getFilesExtension(), options, null);
        for (TableSelection table : options.getSelection().getTables()) {
            if (!table.hasNone()) {
                generateFile(modelsTemplateAbsolutePath, modelsAbsolutePath + File.separator +
                        table.getTable().getName() + "." + options.getFilesExtension(), options, table);
            }
        }
    }
}