const { dirname } = require('path');
const appDir = dirname(require.main.filename);
const fs = require('fs')
const langs = ["en", "es"]
const default_lang = "es"

function  createCommonPath(router, path, renderParams = {
}, cb = () => {}){
    const defaultParams = {
        view: path,
    }
    const split_path = defaultParams.view.split('/')
    const default_name = split_path[split_path.length-1]
    defaultParams.name = default_name
    defaultParams.stylesheet = renderParams.view === undefined ? '/public/styles/' + defaultParams.view + '/index' + '.css' : '/public/styles/' + renderParams.view + '/index' + '.css'

    const possiblePathLogic = appDir + '/src/router/common_path_logic/' + defaultParams.view + '.js'
    if (fs.existsSync(possiblePathLogic)){
        cb = require(possiblePathLogic)
    }

    const possibleSettingsPath = '/src/router/common_path_settings/' + path + '.json'
    
    let renderOptions = {...defaultParams, ...renderParams}

    if (fs.existsSync(appDir + possibleSettingsPath)){
        const fileGeneralParams = JSON.parse(fs.readFileSync(appDir + possibleSettingsPath))
        renderOptions = {
            ...renderOptions,
            ...fileGeneralParams
        }
    }
    renderOptions.lang = default_lang
    renderOptions.langPath = ""
    renderOptions = {
        ...renderOptions,
        ...getTlPartials(default_lang, path)
    }
    createPath('/' + path, cb, renderOptions, router)
    for(let l in langs){
        if(langs[l] == default_lang){
            continue
        } 
        const otherLangRender = {...renderOptions, ...getTlPartials(langs[l], path)}
        otherLangRender.lang = langs[l]
        otherLangRender.langPath = '/' + langs[l]
        createPath(otherLangRender.langPath + '/' + path, cb, otherLangRender, router)
    }
}

function createPath(path, cb, renderOptions, router){
    router.get(path, async (req, res) => {
        const cb_params = await cb(req, res)
        const finalOptions = {...renderOptions, ...cb_params}
        res.render(finalOptions.view, finalOptions)
    })
}

function getTlPartials(lang, path){
    try{
        const partialsDic = {}
        const tlPath = "translations/" + lang + '/' + path
        const filenames = fs.readdirSync(appDir + '/views/partials' + '/' + tlPath)
        filenames.forEach(f => {
            const viewName = f.split('.hbs')[0]
            partialsDic["tl_" + viewName] = tlPath + '/' + viewName
        })
        return partialsDic
    }catch(e){
        
    }
}

module.exports = createCommonPath