import {ProjectConfiguration} from "../project/project-configuration";
import * as path from 'path';
import {Logger} from "../logging/Logger";
import {FileInfo} from "html-pdf";
import ejs = require("ejs");
import pdf = require('html-pdf');

export namespace Renderer {
    interface Content {
        header: string;
        content: string;
        footer: string;
    }

    export async function render(projectPath: string): Promise<string> {
        const projectConfig: ProjectConfiguration = await ProjectConfiguration.read(projectPath);
        const payload = require(path.resolve(projectPath, 'data.js'));
        const content: Content = await renderTemplate(projectPath, projectConfig, payload);

        return generatePdf(content.content, path.resolve(process.cwd(), 'dist/out.pdf'));
    }

    async function renderTemplate(projectPath: string, config: ProjectConfiguration, payload: object): Promise<Content> {
        return {
            header: '',
            content: await renderEjs(path.resolve(projectPath, config.config.main), payload),
            footer: ''
        };
    }

    function renderEjs(file: string, payload: object): Promise<string> {
        return new Promise<string>(resolve => {
            ejs.renderFile(file, payload, {}, (err: Error, html: string) => {
                if (err) {
                    Logger.error('Could not render file :(');
                    Logger.error(err.name);
                    err.message.split('\n').forEach((line: string) => {
                        Logger.error(line);
                    })
                    err.stack.split('\n').forEach((line: string) => {
                        Logger.error(line);
                    })
                }
                resolve(html);
            });
        });
    }

    async function generatePdf(content: string, outPath: string): Promise<string> {
        return new Promise<string>(resolve => {
            pdf.create(content, {}).toFile(outPath, (err: Error, res: FileInfo) => {
                if (err) {
                    Logger.error('Oops! :(');
                    Logger.error(err.name);
                    Logger.error(err.message);
                }
                console.log(res);
                resolve(res.filename);
            });
        });
    }
}