use crate::configuration::Configuration;
use std::fmt::Write;
use std::fs;
use std::io::{Error, Result};
use std::path::PathBuf;

pub fn status(configuration: &Configuration) -> Result<String> {
    let mut status_message = String::new();

    status_message.push_str("# Configuration\n");
    status_message.push_str("\n## Directories\n");

    // Main Configuration Locations
    status_message.push_str(&get_directory_stats(
        "Configuration",
        &configuration.config_directory,
    )?);
    status_message.push_str(&get_directory_stats("Data", &configuration.data_directory)?);
    status_message.push_str(&get_directory_stats(
        "Output",
        &configuration.output_directory,
    )?);

    status_message.push_str("\n## Blog Settings\n");
    writeln!(
        &mut status_message,
        "Number of posts to keep: {}",
        configuration.max_posts
    )
    .map_err(|_| Error::other("Unable to write status"))?;
    Ok(status_message)
}

fn get_directory_stats(label: &str, directory: &PathBuf) -> Result<String> {
    let mut status_message = String::new();

    write!(&mut status_message, "{}: {}. ", label, directory.display())
        .map_err(|_| Error::other("Unable to write status"))?;
    if directory.exists() {
        status_message.push_str("Exists ");
        if fs::read_dir(directory).is_ok() {
            status_message.push_str("and is readable.\n");
        } else {
            status_message.push_str("but is not readable.\n");
        }
    } else {
        status_message.push_str("Does not exist.\n");
    }

    Ok(status_message)
}

#[cfg(test)]
mod tests {
    use std::fs::{metadata, set_permissions};
    use std::path::PathBuf;

    #[cfg(unix)]
    use std::os::unix::fs::PermissionsExt;

    #[cfg(windows)]
    use std::os::windows::fs::PermissionsExt;

    

    use test_utilities::*;

    use super::*;

    #[test]
    fn get_directory_stats_detects_nonexistent_directories() {
        let test_dir = PathBuf::from("/krillinnoooootravez");

        if let Ok(output) = get_directory_stats("krillin", &test_dir) {
            assert!(output.contains("Does not exist."));
        } else {
            panic!("Could not get stats for directory that doesn't exist.");
        }
    }

    #[test]
    fn get_directory_detects_writability() {
        let test_dir = setup_test_dir();

        if let Ok(output) = get_directory_stats("yajirobe", &test_dir) {
            assert!(output.contains("Exists"));
            assert!(output.contains("is readable"));
        } else {
            panic!("Could not get stats for directory that doesn't exist.");
        }

        cleanup_test_dir(&test_dir);
    }

    #[test]
    fn get_directory_detects_lack_of_writability() {
        let test_dir = setup_test_dir();
        let metadata = metadata(&test_dir).expect("Could not fetch metadata for test dir");
        let mut permissions = metadata.permissions();

        #[cfg(unix)]
        {
            permissions.set_mode(0o311);
        }

        set_permissions(&test_dir, permissions.clone())
            .expect("Could not set read permissions on dir");

        if let Ok(output) = get_directory_stats("roshi", &test_dir) {
            assert!(output.contains("Exists"));
            assert!(output.contains("is not readable"));
        } else {
            panic!("Could not get stats for directory that doesn't exist.");
        }

        #[cfg(unix)]
        {
            permissions.set_mode(0o755);
        }

        set_permissions(&test_dir, permissions).expect("Could not reset permissions on dir");

        cleanup_test_dir(&test_dir);
    }
}