import os
import rand

const vexe = @VEXE

fn testsuite_begin() {
    $if windows {
        skip_test('windows does not support envbang lines')
    }
    // Make sure, that we will be using the local v, instead of the globally installed one,
    // for the rest of the tests here:
    local_v_path := os.dir(vexe)
    old_path := os.getenv('PATH')
    os.setenv('PATH', '${local_v_path}:${old_path}', true)
    println('Changed PATH: ${os.getenv('PATH')}')
}

fn test_envbang_script_runs() {
    env_location := '/usr/bin/env'
    if !os.exists(env_location) {
        skip_test('${env_location} does not exist')
    }
    if !os.is_executable(env_location) {
        skip_test('${env_location} is not executable')
    }
    os.find_abs_path_of_executable('v') or { skip_test('v is not in PATH') }
    rndname := rand.ulid()
    rnd_vsh_script_path := os.real_path(os.join_path(os.cache_dir(), '${rndname}.vsh'))
    os.write_file(rnd_vsh_script_path, "#!${env_location} v
import os
println('hello')
println('@VEXE: ${vexe}')
println(os.args)
")!
    os.chmod(rnd_vsh_script_path, 0o700)!
    res := os.execute('${os.quoted_path(rnd_vsh_script_path)} abc 123 -option')
    assert res.exit_code == 0
    lines := res.output.split_into_lines()
    dump(lines)
    assert lines[0] == 'hello'
    assert lines[1].starts_with('@VEXE: ')
    assert os.real_path(lines[1].all_after('@VEXE: ')) == os.real_path(vexe)
    assert lines[2].ends_with(", 'abc', '123', '-option']")
    os.rm(rnd_vsh_script_path)!
}

fn test_envbang_script_accepts_existing_file_paths() {
    env_location := '/usr/bin/env'
    if !os.exists(env_location) {
        skip_test('${env_location} does not exist')
    }
    if !os.is_executable(env_location) {
        skip_test('${env_location} is not executable')
    }
    os.find_abs_path_of_executable('v') or { skip_test('v is not in PATH') }
    rndname := rand.ulid()
    rnd_vsh_script_path := os.real_path(os.join_path(os.cache_dir(), '${rndname}.vsh'))
    existing_path := os.real_path(os.join_path(os.cache_dir(), '${rndname}.txt'))
    os.write_file(rnd_vsh_script_path, "#!${env_location} v
import os
import flag

fn main() {
    mut fp := flag.new_flag_parser(os.args)
    fp.skip_executable()
    file_path := fp.string('path', `p`, '', 'The path to the file to read')
    fp.finalize() or {
        eprintln(err)
        exit(1)
    }
    println('File path: ' + file_path)
}
")!
    os.write_file(existing_path, 'hello')!
    os.chmod(rnd_vsh_script_path, 0o700)!
    res :=
        os.execute('${os.quoted_path(rnd_vsh_script_path)} --path ${os.quoted_path(existing_path)}')
    assert res.exit_code == 0
    assert res.output.trim_space() == 'File path: ${existing_path}'
    os.rm(rnd_vsh_script_path)!
    os.rm(existing_path)!
}

@[noreturn]
fn skip_test(reason string) {
    println('skipping test, because ${reason} .')
    exit(0)
}