const AbstractGitState = require('./AbstractGitState')

class CheckoutState extends AbstractGitState {
    static get services() {
        return [...super.services, 'output']
    }

    async apply() {
        if ( !(await this.check()) ) {
            const repo = await this._repo()
            await repo.checkout(this._config.target)
        }
    }

    async check() {
        const repo = await this._repo()
        const target = await this._config.target
        try {
            if ( (await repo.current_branch()) === target ) return true
            if ( (await repo.current_ref()) === target ) return true
        } catch (e) {}
        return false
    }

    async reverse() {
        if ( this._config.revert_to ) {
            if ( await this.check() ) {
                const repo = await this._repo()
                await repo.checkout(this._config.revert_to)
            }
        } else {
            this.output.warn('Checkout state does not currently support automatic reversal. Specify the revert_to config key to enable.')
        }
    }

    failure_message() {
        return `The Git repo at "${this._config.path}" on host "${this._host.name}" is not checked out to the correct ref (${this._config.target}).`
    }

    check_message() {
        return this.failure_message()
    }
}

module.exports = exports = CheckoutState