import { JsonValue } from '@std/json'
import { ensureFile } from '@std/fs'
import piConfig from '../config.json' with { type: 'json' }

const { config, service, script, network, local } = injectEnv(piConfig)

const sh = `
#!/bin/sh

# configure id
sudo raspi-config nonint do_hostname ${config.host}
sudo useradd -m ${config.user}
echo -e "${config.password}\\n${config.password}" | passwd ${config.user}

# configure localization
sudo raspi-config nonint do_change_timezone ${local.timezone}
sudo raspi-config nonint do_configure_keyboard ${local.keyboard}
sudo raspi-config nonint do_wifi_country ${local.country}

# configure network
sudo raspi-config nonint do_wifi_ssid_passphrase ${network.ssid} ${network.password}

# configure services
sudo raspi-config nonint do_ssh 0 #(enable = 0, disable = 1)
echo -e "${service.ssh_key}" >> /home/${config.user}/.ssh/authorized_keys

# custom scripts
${script.join('\n')}
`

const fileName = './dist/prepare.sh'
await ensureFile(fileName)
await Deno.writeTextFile(fileName, sh)

function injectEnv<T extends Record<string, JsonValue>>(config: T): T {
	for (const key in config) {
		const value = config[key]
		if (typeof value === 'object') {
			config[key] = injectEnv(
				value as Record<string, JsonValue>,
			) as typeof value
		} else if (typeof value === 'string') {
			const variables = value.match(/{{\w+}}/g) ?? []
			for (const variable of variables) {
				const env = Deno.env.get(variable.slice(2, -2))
				if (env === undefined) {
					throw new Error(`env ${variable.slice(2, -2)} is not set`)
				}
				config[key] = value.replaceAll(variable, env) as typeof value
			}
		}
	}
	return config
}