use anyhow::Result;

mod common;

use common::common_args::*;
use common::process::*;
use common::program::*;
use common::target::*;

//------------------------------------------

const USAGE: &str = "cache_metadata_size 0.9.0
Estimate the size of the metadata device needed for a given configuration.

USAGE:
    cache_metadata_size [OPTIONS] <--device-size <SECTORS> --block-size <SECTORS> | --nr-blocks <NUM>>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
        --block-size <SECTORS>      Specify the size of each cache block
        --device-size <SECTORS>     Specify total size of the fast device used in the cache
        --max-hint-width <BYTES>    Specity the per-block hint width [default: 4]
        --nr-blocks <NUM>           Specify the number of cache blocks";

//------------------------------------------

struct CacheMetadataSize;

impl<'a> Program<'a> for CacheMetadataSize {
    fn name() -> &'a str {
        "cache_metadata_size"
    }

    fn cmd<I>(args: I) -> Command
    where
        I: IntoIterator,
        I::Item: Into<std::ffi::OsString>,
    {
        cache_metadata_size_cmd(args)
    }

    fn usage() -> &'a str {
        USAGE
    }

    fn arg_type() -> ArgType {
        ArgType::InputArg
    }

    fn bad_option_hint(option: &str) -> String {
        msg::bad_option_hint(option)
    }
}

//------------------------------------------

test_accepts_help!(CacheMetadataSize);
test_accepts_version!(CacheMetadataSize);
test_rejects_bad_option!(CacheMetadataSize);

//------------------------------------------

#[test]
fn no_args() -> Result<()> {
    let _stderr = run_fail(cache_metadata_size_cmd([""; 0]))?;
    Ok(())
}

#[test]
fn device_size_only() -> Result<()> {
    let _stderr = run_fail(cache_metadata_size_cmd(args!["--device-size", "204800"]))?;
    Ok(())
}

#[test]
fn block_size_only() -> Result<()> {
    let _stderr = run_fail(cache_metadata_size_cmd(args!["--block-size", "128"]))?;
    Ok(())
}

/*
#[test]
fn conradictory_info_fails() -> Result<()> {
    let stderr = run_fail(cache_metadata_size_cmd(
        args![
            "--device-size",
            "102400",
            "--block-size",
            "1000",
            "--nr-blocks",
            "6"
        ],
    ))?;
    assert_eq!(stderr, "Contradictory arguments given, --nr-blocks doesn't match the --device-size and --block-size.");
    Ok(())
}

#[test]
fn all_args_agree() -> Result<()> {
    let out = run_ok_raw(cache_metadata_size_cmd(
        args![
            "--device-size",
            "102400",
            "--block-size",
            "100",
            "--nr-blocks",
            "1024"
        ],
    ))?;
    let stdout = std::str::from_utf8(&out.stdout[..])
        .unwrap()
        .trim_end_matches(|c| c == '\n' || c == '\r')
        .to_string();
    assert_eq!(stdout, "8248 sectors");
    assert_eq!(out.stderr.len(), 0);
    Ok(())
}
*/

#[test]
fn dev_size_and_nr_blocks_conflicts() -> Result<()> {
    run_fail(cache_metadata_size_cmd(args![
        "--device-size",
        "102400",
        "--nr-blocks",
        "1024"
    ]))?;
    Ok(())
}

#[test]
fn block_size_and_nr_blocks_conflicts() -> Result<()> {
    run_fail(cache_metadata_size_cmd(args![
        "--block-size",
        "100",
        "--nr-blocks",
        "1024"
    ]))?;
    Ok(())
}

#[test]
fn nr_blocks_alone() -> Result<()> {
    let out = run_ok_raw(cache_metadata_size_cmd(args!["--nr-blocks", "1024"]))?;
    let stdout = std::str::from_utf8(&out.stdout[..])
        .unwrap()
        .trim_end_matches(|c| c == '\n' || c == '\r')
        .to_string();
    assert_eq!(stdout, "8248 sectors");
    assert_eq!(out.stderr.len(), 0);
    Ok(())
}

#[test]
fn dev_size_and_block_size_succeeds() -> Result<()> {
    let out = run_ok_raw(cache_metadata_size_cmd(args![
        "--device-size",
        "102400",
        "--block-size",
        "100"
    ]))?;
    let stdout = std::str::from_utf8(&out.stdout[..])
        .unwrap()
        .trim_end_matches(|c| c == '\n' || c == '\r')
        .to_string();
    assert_eq!(stdout, "8248 sectors");
    assert_eq!(out.stderr.len(), 0);
    Ok(())
}

#[test]
fn large_nr_blocks() -> Result<()> {
    let out = run_ok_raw(cache_metadata_size_cmd(args!["--nr-blocks", "67108864"]))?;
    let stdout = std::str::from_utf8(&out.stdout[..])
        .unwrap()
        .trim_end_matches(|c| c == '\n' || c == '\r')
        .to_string();
    assert_eq!(stdout, "3678208 sectors");
    assert_eq!(out.stderr.len(), 0);
    Ok(())
}

//------------------------------------------