mod parser;
pub mod user_info;
pub mod vcs;

use crate::vcs::git;
use comfy_table::Table;
use humansize::{format_size, BINARY};
use parser::*;
use rustyline::{error::ReadlineError, DefaultEditor};
use std::{io, ops::ControlFlow};
use thiserror::Error;

pub fn run_command(user_input: &str) -> Result<ControlFlow<(), ()>, ShackleError> {
    match user_input.parse::<ShackleCommand>() {
        Err(parse_error) => {
            println!("{}", parse_error);
        }
        Ok(ShackleCommand::Exit) => {
            return Ok(ControlFlow::Break(()));
        }
        Ok(ShackleCommand::List(ListArgs { verbose })) => {
            let mut table = Table::new();
            if !verbose {
                table.set_header(vec!["path", "description"]);
                let listing = git::list()?;
                for meta in listing {
                    table.add_row(vec![meta.path.display().to_string(), meta.description]);
                }
            } else {
                table.set_header(vec!["path", "description", "size"]);
                let listing = git::list_verbose()?;
                for meta in listing {
                    table.add_row(vec![
                        meta.path.display().to_string(),
                        meta.description,
                        format_size(meta.size, BINARY),
                    ]);
                }
            }

            println!("{table}");
        }
        Ok(ShackleCommand::SetDescription(SetDescriptionArgs {
            directory,
            description,
        })) => {
            git::set_description(&directory, &description)?;
            println!("Successfully updated description");
        }
        Ok(ShackleCommand::SetBranch(SetBranchArgs { directory, branch })) => {
            git::set_branch(&directory, &branch)?;
            println!("Successfully updated branch");
        }
        Ok(ShackleCommand::Init(InitArgs {
            repo_name,
            group,
            description,
            branch,
        })) => {
            let init_result = git::init(&repo_name, &group, &description, &branch)?;
            println!("Successfully created \"{}\"", init_result.path.display());
        }
        Ok(ShackleCommand::Delete(DeleteArgs { directory })) => {
            if confirm_risky_action(format!(
                "Are you sure you want to delete \"{}\"?",
                directory.display()
            ))? {
                git::delete(&directory)?;
                println!("Successfully deleted \"{}\"", directory.display());
            } else {
                println!("Action cancelled");
            }
        }
        Ok(ShackleCommand::Housekeeping(HousekeepingArgs { directory })) => match directory {
            Some(directory) => {
                git::housekeeping(&directory)?;
                println!(
                    "Successfully did housekeeping on \"{}\"",
                    directory.display()
                );
            }
            None => {
                let list = git::list()?;
                for repo in list {
                    git::housekeeping(&repo.path)?;
                    println!(
                        "Successfully did housekeeping on \"{}\"",
                        repo.path.display()
                    );
                }
            }
        },
        Ok(ShackleCommand::GitUploadPack(upload_pack_args)) => {
            git::upload_pack(&upload_pack_args)?;
        }
        Ok(ShackleCommand::GitReceivePack(receive_pack_args)) => {
            git::receive_pack(&receive_pack_args)?;
        }
    }
    Ok(ControlFlow::Continue(()))
}

fn confirm_risky_action(prompt: String) -> Result<bool, ShackleError> {
    let mut rl = DefaultEditor::new()?;
    loop {
        let user_input = rl
            .readline(&format!("{} (yes/no) ", prompt))
            .map(|user_input| user_input.to_lowercase())?;

        match user_input.trim() {
            "" => {}
            "yes" => {
                return Ok(true);
            }
            "no" => {
                return Ok(false);
            }
            _ => {
                println!("Please answer 'yes' or 'no'.");
            }
        }
    }
}

#[derive(Error, Debug)]
pub enum ShackleError {
    #[error(transparent)]
    IoError(#[from] io::Error),
    #[error(transparent)]
    NixError(#[from] nix::errno::Errno),
    #[error(transparent)]
    GitError(#[from] git2::Error),
    #[error(transparent)]
    ReadlineError(#[from] ReadlineError),
    #[error("Could not get the current user name")]
    UserReadError,
    #[error("Path is not accessible")]
    InvalidDirectory,
    #[error("Unknown group")]
    InvalidGroup,
}