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use goblin::{self, Object};
use ignore::WalkBuilder;
use std::collections::HashMap;
use std::fs;
use std::path::{Path, PathBuf};

/// The main program wrapper.
pub struct MissingBlobs {
    recursive: bool,
}

impl MissingBlobs {
    /// Creates a new MissingBlobs builder.
    pub fn builder() -> MissingBlobsBuilder {
        MissingBlobsBuilder::default()
    }

    /// Searches for blobs in the given paths, and displays missing dependencies.
    pub fn run(&self, paths: &[&str]) {
        let file_paths: Vec<PathBuf> = if self.recursive {
            find_files_recursively(&paths)
        } else {
            find_files(&paths)
        };

        let blob_paths: Vec<&PathBuf> = file_paths
            .iter()
            .filter(|path| match path.extension() {
                // Assume that valid blobs have ".so" extension.
                Some(ext) => ext == "so",
                None => false,
            })
            .collect();

        let blobs_to_dependencies = get_dependencies(&blob_paths);
        let missing_blobs = identify_missing(&blobs_to_dependencies);
        display_missing_blobs(&missing_blobs);
    }
}

/// The MissingBlobs builder.
pub struct MissingBlobsBuilder {
    recursive: bool,
}

impl Default for MissingBlobsBuilder {
    fn default() -> Self {
        Self { recursive: false }
    }
}

impl MissingBlobsBuilder {
    /// Builds a MissingBlobs.
    pub fn build(&self) -> MissingBlobs {
        MissingBlobs {
            recursive: self.recursive,
        }
    }

    /// Sets whether to search paths recursively.
    pub fn recursive(mut self, enable: bool) -> Self {
        self.recursive = enable;
        self
    }
}

fn find_files(paths: &[&str]) -> Vec<PathBuf> {
    let dirs = paths
        .iter()
        .map(Path::new)
        .filter(|path| path.is_dir())
        .collect::<Vec<_>>();

    let file_paths: Vec<PathBuf> = dirs
        .iter()
        .map(|dir| fs::read_dir(dir).expect("Could not read directory."))
        .flat_map(|read_dir| {
            read_dir.map(|dir_entry| dir_entry.expect("Could not read directory entry.").path())
        })
        .collect();

    file_paths
}

fn find_files_recursively(paths: &[&str]) -> Vec<PathBuf> {
    let mut walker = WalkBuilder::new(paths[0]);
    for path in &paths[1..] {
        walker.add(path);
    }

    // Don't read from ignore configs
    walker
        .ignore(false)
        .git_ignore(false)
        .git_exclude(false)
        .git_global(false);

    walker
        .build()
        .map(|dir_entry| {
            dir_entry
                .expect("Could not read directory entry.")
                .into_path()
        })
        .collect()
}

fn get_dependencies(blob_paths: &[&PathBuf]) -> HashMap<String, Vec<String>> {
    let mut dependencies: HashMap<String, Vec<String>> = HashMap::new();

    blob_paths.iter().for_each(|path| {
        let filename = path
            .file_name()
            .expect("Could not get file name.")
            .to_str()
            .expect("Could not convert to string.")
            .to_owned();

        let buffer;
        match fs::read(&path) {
            Ok(b) => buffer = b,
            Err(_) => {
                eprintln!("Warning: Could not read file: {}", path.display());
                return;
            },
        }

        let obj = goblin::Object::parse(&buffer);

        if let Ok(Object::Elf(elf)) = obj {
            let deps: Vec<String> = elf.libraries.iter().map(|dep| dep.to_string()).collect();
            dependencies.insert(filename, deps);
        }
    });

    dependencies
}

fn identify_missing(
    blobs_to_dependencies: &HashMap<String, Vec<String>>,
) -> HashMap<String, Vec<String>> {
    let mut dependencies_to_blobs: HashMap<String, Vec<String>> = HashMap::new();
    blobs_to_dependencies.iter().for_each(|(blob, deps)| {
        deps.iter().for_each(
            |dependency| match dependencies_to_blobs.get_mut(dependency) {
                Some(dependants) => {
                    dependants.push(blob.to_owned());
                }
                None => {
                    dependencies_to_blobs.insert(dependency.to_owned(), vec![blob.to_owned()]);
                }
            },
        )
    });

    let mut missing_blobs: HashMap<String, Vec<String>> = HashMap::new();

    for dep in dependencies_to_blobs.keys() {
        if !blobs_to_dependencies.contains_key(dep) {
            // Dependency is not present.
            let missing_dep = dep.to_owned();
            let blobs_requiring_missing_dep = dependencies_to_blobs[dep].to_owned();
            missing_blobs.insert(missing_dep, blobs_requiring_missing_dep);
        }
    }

    missing_blobs
}

fn display_missing_blobs(missing_blobs: &HashMap<String, Vec<String>>) {
    for blob in missing_blobs.keys() {
        println!("{} required by: {}", blob, missing_blobs[blob].join("; "));
    }
}