// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::path::PathBuf;
use std::process::exit;

use clap::Parser;
use itertools::Itertools;

/// A fake editor, useful for testing
// It's overkill to use clap for a single argument, but we already use it in many other places...
#[derive(Parser, Debug)]
#[clap()]
struct Args {
    /// Path to the file to edit
    file: PathBuf,
}

fn main() {
    let args: Args = Args::parse();
    let edit_script_path = PathBuf::from(std::env::var_os("EDIT_SCRIPT").unwrap());
    let edit_script = String::from_utf8(std::fs::read(&edit_script_path).unwrap()).unwrap();
    for instruction in edit_script.split('\0') {
        let (command, payload) = instruction.split_once('\n').unwrap_or((instruction, ""));
        let parts = command.split(' ').collect_vec();
        match parts.as_slice() {
            [""] => {}
            ["fail"] => exit(1),
            ["write"] => {
                std::fs::write(&args.file, payload).unwrap();
            }
            _ => {
                eprintln!("unexpected command: {}", command);
                exit(1)
            }
        }
    }
}