// generate-console-pages.js

const fs = require('fs');
const yaml = require('js-yaml');

/**
 * This helper script, run by the technical writers, (re)generates markdown
 * documents for the Enterprise reference section. It assumes the existence
 * of `console-settings.yaml`, to be sourced as a build artifact from
 * pomerium/pomerium-console, and `pomerium-console_serve.yaml`, sourced from
 * running `pomerium-console gendocs.
 */


// Functions

/**
 * 
 * Import content from /docs/reference/settings.yaml when needed.
 */
const fromOSSettings = (dupe) => { //Where dupe is the name provided to the function in writeSubsection()
        //console.log(`dupe: ${dupe}`) // For Debugging
    const asArray = Object.entries(OSSettings)
        //console.log(asArray) // For Debugging
    return asArray.filter(x => x.name === dupe).doc
    //console.log(JSON.stringify(recursiveSearch([OSSettings], `${dupe}`)))  // One of several helper functions I tried and scrapped.
    //return console.log(asArray)
}


/**
 *  Import console environment/config options from `pomerium-console_serve.yaml`
 */
const writeConfigPage = (src) => {
        //console.log(`keys from src file: ` + JSON.stringify(src)) // For Debugging
    let path = './docs/enterprise/reference/config.md'
    console.log(`Generating environment variable docs...\n`)
    let frontmatter =
`---
title: Environment Variables
lang: en-US
meta:
    - name: keywords
      content: configuration options settings Pomerium enterprise console
---

# Pomerium Console Environment Variables

The keys listed below can be applied in Pomerium Console's \`config.yaml\` file, or applied as environment variables (in uppercase, replacing \`-\` with \`_\`).

`
    const keySection = (obj) => {
            //console.log(JSON.stringify(obj.name)) // For Debugging
        let header = `## ` + obj.name + '\n\n'
        let body =
`${obj.usage}

**Default value:** \`${obj.default_value ? obj.default_value : `none`}\`
`
        return header + body
    }

    let content = frontmatter + src.options.map(section => keySection(section)).join('\n')
    fs.writeFileSync(path, content)
}


/**
 * Read `console-settings.yaml` and write
 * markdown pages under `docs/enterprise/reference`.
*/
const writePage = (setting) => {
    let path = './docs/enterprise/reference/' + setting.name.replace(/\s/g, '-').toLowerCase() + ".md"
    console.log('Generating', path, "page")

    let frontmatter =
`---
title: ${setting.name}
lang: en-US
sidebarDepth: 2
meta:
    - name: keywords
      content: configuration options settings Pomerium enterprise console
---

`

    let header = '# ' + setting.name + '\n' + '\n'
    let body = setting.doc ? setting.doc.toString() + '\n' : ''
    let moreBody = setting.settings ? setting.settings.map(subsection => writeSubsection(subsection, 2)).join('') : ''
    let content = frontmatter + header + body + moreBody

    fs.writeFileSync(path, content)

}

/**
 * Called by writePage, this function
 * handles nested settings objects.
 */
const writeSubsection = (subsection, depth) => {
    let subContent = ''
    if (!subsection.name) {
        return
    }
    if (subsection.dupe) {
        subContent = fromOSSettings(subsection.name)
    }
    let header = '#'.repeat(depth) + ' ' + subsection.name + '\n' + '\n'
    subContent = subContent + (subsection.doc ? subsection.doc.toString() + '\n\n' : '')
    subsection.attributes ? subContent = subContent + subsection.attributes.toString() : null
    subsection.settings ? subContent = subContent + subsection.settings.map(turtles => writeSubsection(turtles, depth + 1)).join('') : ''
    return header + subContent
}

// Main

console.log("Reading console-settings.yaml")

let docs = yaml.load(fs.readFileSync('./docs/enterprise/console-settings.yaml', 'utf8'))
let keysFile = yaml.load(fs.readFileSync('./docs/enterprise/pomerium-console_serve.yaml', 'utf8'))
let OSSettings = yaml.load(fs.readFileSync('./docs/reference/settings.yaml', 'utf8'))
    //console.log(`OSSettings: ${JSON.stringify(OSSettings)}`) // For Debugging

writeConfigPage(keysFile)

docs.settings.map( setting => {
    writePage(setting)    
})