const fs = require('fs')
const path = require('path')
const process = require('child_process')

/// List of configs to clean.
const configPaths = [
    '../../engine/launcher/src/main/resources/META-INF/native-image/org/enso/launcher',
    '../../lib/scala/project-manager/src/main/resources/META-INF/native-image/org/enso/projectmanager',
]

/// Checks if the entry is ephemeral (contains a pointer in its name).
function isEntryEphemeralClass(entry) {
    const name = entry['name']
    if (name === undefined) {
        return false
    }
    return name.indexOf('/0x00') >= 0
}

/// Sorts the list of entries in a predictable order.
function sortEntries(entries) {
    const copy = Array.from(entries)
    copy.sort((first, second) => {
        const firstName = first['name']
        const secondName = second['name']
        if (firstName !== undefined && secondName !== undefined) {
            return firstName < secondName
        } else if (firstName === undefined && secondName === undefined) {
            return JSON.stringify(first) < JSON.stringify(second)
        } else {
            return firstName === undefined
        }
    })
    return copy
}

/// Removes ephemeral classes from the reflection config and ensures it has a
/// stable order of entries.
function cleanReflectionConfig(reflectConfigPath) {
    const data = fs.readFileSync(reflectConfigPath, 'utf-8')
    const parsed = JSON.parse(data)
    const withoutEphemeral = parsed.filter(entry => !isEntryEphemeralClass(entry))
    const sorted = sortEntries(withoutEphemeral)
    const serialized = JSON.stringify(sorted)
    const hasChanges = serialized !== JSON.stringify(parsed)
    if (hasChanges) {
        fs.writeFileSync(reflectConfigPath, serialized)
        console.log('Rewritten ' + reflectConfigPath)
    } else {
        console.log('No changes in ' + reflectConfigPath)
    }
}

/// Runs prettier on the provided path.
function runPrettier(configPath) {
    console.log('Running prettier for ' + configPath)
    process.spawn('npx', ['prettier', '--write', configPath], {
        stdio: 'inherit',
    })
}

configPaths.forEach(function (configPath) {
    cleanReflectionConfig(path.join(configPath, 'reflect-config.json'))
    runPrettier(configPath)
})