const fs = require("fs");
const path = require("path");
const { env, exit } = require("process");
const expect = require("chai").expect;
const Ajv = require("ajv").default;
const ajv = new Ajv({allErrors: true});
require("ajv-errors")(ajv);

//let root, slug;
//let workingDirectory = path.join(root, slug);
//console.log(`👷‍♂️ Working with ‘${slug}’ slug.`);

const themeSchemaFile = ".gitlab/node_job/json_theme_schema.jsonc";
let wppManifest;
let validator;
let files;

function leftOuterJoin(leftArray, rightArray) {
    return leftArray.filter(function(el) {
        return this.indexOf(el) < 0; 
    }, rightArray);
}

function flatReferences(wppManifest) {
    allImageIds = [
        wppManifest.dayHighlight,
        wppManifest.nightHighlight,
        ...wppManifest.dayImageList, 
        ...wppManifest.nightImageList,
        ...(wppManifest.sunsetImageList || []),
        ...(wppManifest.sunriseImageList || [])
    ];
    return allImageIds.filter(el => el !== undefined).map(el => {
        return wppManifest.imageFilename.replace("*", el);
    });
}

describe('Mandatory Checks', function() {
    before(function() {
        slug = env.WPP_SLUG;
        expect(slug).to.be.a("string").that.is.not.empty;
        root = env.WPP_ROOT;
        expect(root).to.be.a("string").that.is.not.empty;
        workingDirectory = path.join(root, slug);
        files = fs.readdirSync(workingDirectory);
        expect(files).to.be.an('array').that.is.not.empty;
        validator = ajv.compile(JSON.parse(fs.readFileSync(themeSchemaFile, 'utf8')));
    }); 

    step('Manifest is an existing json file', function() {
        wppManifest = JSON.parse(fs.readFileSync(path.join(workingDirectory, "theme.json"), "utf8"));
    });

    step('Manifest passes the schema', function() {
        const isValid = validator(wppManifest);
        if(!isValid) expect.fail(`\n\t• ${validator.errors.map(el => {return el.message;}).join('\n\t• ')}`);
    });

    step('There are no missing files', function() {
        let references = flatReferences(wppManifest);
        references.push("theme.json");
        missings = leftOuterJoin(references, files);
        expect(missings, 
            `The following reference${(missings.length > 1)? "s": ""} from theme.json ${(missings.length > 1)? "are": "is"} missing in the pack. Consider adding ${(missings.length > 1)? "them": " it"} to the pack or removing the reference${(missings.length > 1)? "s": ""} from the theme.json:\n\t• ${missings.join('\n\t• ')}\n`
            ).to.be.lengthOf(0, );
    });

    step('There are no orphan files', function() {
        let references = flatReferences(wppManifest);
        orphans = leftOuterJoin(files.filter(x => x !== "theme.json"), references);
        expect(orphans,
            `The following orphan file${(orphans.length > 1)? "s are": " is"} not referenced in this theme.json. Consider removing the file${(orphans.length > 1)? "s": ""} or referencing ${(orphans.length > 1)? "them": "it"} in the theme.json:\n\t• ${orphans.join('\n\t• ')}\n`
            ).to.be.lengthOf(0);
    });

});