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//! Data for use in rbspy tests and benchmarks :-)

extern crate elf;
extern crate flate2;
extern crate libc;
extern crate remoteprocess;

use std::fs::File;
use std::io::{self, BufReader, Cursor, Read};
use std::path::Path;

use anyhow::{format_err, Context, Error};
use remoteprocess::{Error as ProcessError, ProcessMemory};

use self::flate2::bufread::GzDecoder;

/// Open data file `name`.
fn data_file<P: AsRef<Path>>(name: P) -> Result<File, Error> {
    let name = name.as_ref();
    let path = Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("data")
        .join(name);

    Ok(File::open(&path).context(format!("could not open data file `{}`", path.display()))?)
}

/// Get contents of gzipped data file `name`.
fn data_file_gz_contents<P: AsRef<Path>>(name: P) -> Result<Vec<u8>, Error> {
    let file = BufReader::new(data_file(&name)?);
    let mut data = vec![];
    GzDecoder::new(file)
        .read_to_end(&mut data)
        .context(format!(
            "failed to read gzipped data file `{}`",
            name.as_ref().display()
        ))?;

    Ok(data)
}

/// Load coredump from gzipped data file `name`.
fn load_coredump<P: AsRef<Path>>(name: P) -> Result<CoreDump, Error> {
    let data = data_file_gz_contents(&name)?;

    match elf::File::open_stream(&mut Cursor::new(data)) {
        Ok(elf_file) => Ok(CoreDump::from(elf_file)),
        Err(e) => Err(format_err!(
            "could not parse elf file `{}`: {:?}",
            name.as_ref().display(),
            e
        )),
    }
}

pub fn coredump_1_9_3() -> CoreDump {
    load_coredump("ruby-coredump-1.9.3.gz").unwrap()
}
pub fn coredump_2_1_6() -> CoreDump {
    load_coredump("ruby-coredump-2.1.6.gz").unwrap()
}
pub fn coredump_2_1_6_c_function() -> CoreDump {
    load_coredump("ruby-coredump-2.1.6_c_function.gz").unwrap()
}
pub fn coredump_2_4_0() -> CoreDump {
    load_coredump("ruby-coredump-2.4.0.gz").unwrap()
}
pub fn coredump_2_5_0() -> CoreDump {
    load_coredump("ruby-coredump-2.5.0.gz").unwrap()
}

pub fn coredump_2_7_2() -> CoreDump {
    load_coredump("ruby-coredump-2.7.2.gz").unwrap()
}

pub fn coredump_3_0_0() -> CoreDump {
    load_coredump("ruby-coredump-3.0.0.gz").unwrap()
}

pub fn coredump_3_1_0() -> CoreDump {
    load_coredump("ruby-coredump-3.1.0.gz").unwrap()
}

pub fn coredump_3_2_0() -> CoreDump {
    load_coredump("ruby-coredump-3.2.0.gz").unwrap()
}

/// Allows testing offline with a core dump of a Ruby process.
pub struct CoreDump {
    file: elf::File,
}

impl From<elf::File> for CoreDump {
    fn from(file: elf::File) -> CoreDump {
        CoreDump { file }
    }
}

impl ProcessMemory for CoreDump {
    fn read(&self, addr: usize, buf: &mut [u8]) -> Result<(), ProcessError> {
        let start = addr as u64;
        let end = (addr + buf.len()) as u64;
        match self.file.sections.iter().find(|section| {
            section.shdr.addr <= start && end <= section.shdr.addr + section.shdr.size
        }) {
            Some(sec) => {
                let start = addr - sec.shdr.addr as usize;
                let end = addr + buf.len() - sec.shdr.addr as usize;
                buf.copy_from_slice(&sec.data[start..end]);
                Ok(())
            }
            None => {
                let io_error = io::Error::from_raw_os_error(libc::EFAULT);

                Err(ProcessError::IOError(io_error))
            }
        }
    }
}