use anyhow::Result;

mod common;

use common::common_args::*;
use common::input_arg::*;
use common::output_option::*;
use common::test_dir::*;
use common::*;

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

const USAGE: &str = "Usage: thin_repair [options] {device|file}\n\
                     Options:\n  \
                       {-h|--help}\n  \
                       {-i|--input} <input metadata (binary format)>\n  \
                       {-o|--output} <output metadata (binary format)>\n  \
                       {--transaction-id} <natural>\n  \
                       {--data-block-size} <natural>\n  \
                       {--nr-data-blocks} <natural>\n  \
                       {-V|--version}";

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

struct ThinRepair;

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

    fn path() -> &'a str {
        THIN_REPAIR
    }

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

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

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

impl<'a> InputProgram<'a> for ThinRepair {
    fn mk_valid_input(td: &mut TestDir) -> Result<std::path::PathBuf> {
        mk_valid_md(td)
    }

    fn file_not_found() -> &'a str {
        cpp_msg::FILE_NOT_FOUND
    }

    fn missing_input_arg() -> &'a str {
        cpp_msg::MISSING_INPUT_ARG
    }

    fn corrupted_input() -> &'a str {
        "The following field needs to be provided on the command line due to corruption in the superblock"
    }
}

impl<'a> OutputProgram<'a> for ThinRepair {
    fn file_not_found() -> &'a str {
        cpp_msg::FILE_NOT_FOUND
    }

    fn missing_output_arg() -> &'a str {
        cpp_msg::MISSING_OUTPUT_ARG
    }
}

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

test_accepts_help!(ThinRepair);
test_accepts_version!(ThinRepair);
test_rejects_bad_option!(ThinRepair);

test_input_file_not_found!(ThinRepair);
test_input_cannot_be_a_directory!(ThinRepair);
test_corrupted_input_data!(ThinRepair);

test_missing_output_option!(ThinRepair);

//-----------------------------------------
// test output to a small file

// TODO: share with thin_restore

#[test]
fn dont_repair_xml() -> Result<()> {
    let mut td = TestDir::new()?;
    let md = mk_zeroed_md(&mut td)?;
    let xml = mk_valid_xml(&mut td)?;
    let xml_path = xml.to_str().unwrap();
    let md_path = md.to_str().unwrap();
    run_fail(THIN_REPAIR, &["-i", xml_path, "-o", md_path])?;
    Ok(())
}

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

// TODO: share with thin_dump

fn override_thing(flag: &str, val: &str, pattern: &str) -> Result<()> {
    let mut td = TestDir::new()?;
    let md1 = mk_valid_md(&mut td)?;
    let md2 = mk_zeroed_md(&mut td)?;
    let md1_path = md1.to_str().unwrap();
    let md2_path = md2.to_str().unwrap();
    let output = run_ok_raw(THIN_REPAIR, &[flag, val, "-i", md1_path, "-o", md2_path])?;
    assert_eq!(output.stderr.len(), 0);
    let md2_path = md2.to_str().unwrap();
    let output = run_ok(THIN_DUMP, &[md2_path])?;
    assert!(output.contains(pattern));
    Ok(())
}

#[test]
fn override_transaction_id() -> Result<()> {
    override_thing("--transaction-id", "2345", "transaction=\"2345\"")
}

#[test]
fn override_data_block_size() -> Result<()> {
    override_thing("--data-block-size", "8192", "data_block_size=\"8192\"")
}

#[test]
fn override_nr_data_blocks() -> Result<()> {
    override_thing("--nr-data-blocks", "234500", "nr_data_blocks=\"234500\"")
}

// FIXME: that's repair_superblock in thin_dump.rs
#[test]
fn superblock_succeeds() -> Result<()> {
    let mut td = TestDir::new()?;
    let md1 = mk_valid_md(&mut td)?;
    let md1_path = md1.to_str().unwrap();
    let original = run_ok_raw(
        THIN_DUMP,
        &[
            "--transaction-id=5",
            "--data-block-size=128",
            "--nr-data-blocks=4096000",
            md1_path,
        ],
    )?;
    assert_eq!(original.stderr.len(), 0);
    damage_superblock(&md1)?;
    let md2 = mk_zeroed_md(&mut td)?;
    let md2_path = md2.to_str().unwrap();
    run_ok(
        THIN_REPAIR,
        &[
            "--transaction-id=5",
            "--data-block-size=128",
            "--nr-data-blocks=4096000",
            "-i",
            md1_path,
            "-o",
            md2_path,
        ],
    )?;
    let repaired = run_ok_raw(THIN_DUMP, &[md2_path])?;
    assert_eq!(repaired.stderr.len(), 0);
    assert_eq!(original.stdout, repaired.stdout);
    Ok(())
}

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

// TODO: share with thin_dump

fn missing_thing(flag1: &str, flag2: &str, pattern: &str) -> Result<()> {
    let mut td = TestDir::new()?;
    let md1 = mk_valid_md(&mut td)?;
    damage_superblock(&md1)?;
    let md2 = mk_zeroed_md(&mut td)?;
    let stderr = run_fail(
        THIN_REPAIR,
        &[
            flag1,
            flag2,
            "-i",
            md1.to_str().unwrap(),
            "-o",
            md2.to_str().unwrap(),
        ],
    )?;
    assert!(stderr.contains(pattern));
    Ok(())
}

#[test]
fn missing_transaction_id() -> Result<()> {
    missing_thing(
        "--data-block-size=128",
        "--nr-data-blocks=4096000",
        "transaction id",
    )
}

#[test]
fn missing_data_block_size() -> Result<()> {
    missing_thing(
        "--transaction-id=5",
        "--nr-data-blocks=4096000",
        "data block size",
    )
}

#[test]
fn missing_nr_data_blocks() -> Result<()> {
    missing_thing(
        "--transaction-id=5",
        "--data-block-size=128",
        "nr data blocks",
    )
}

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