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#![forbid(unsafe_code)]

use crate::cli::{help, SudoAction, SudoOptions};
use crate::common::{resolve::resolve_current_user, Context, Error};
use crate::log::dev_info;
use crate::system::timestamp::RecordScope;
use crate::system::{time::Duration, timestamp::SessionRecordFile, Process};
use pam::PamAuthenticator;
use pipeline::{Pipeline, PolicyPlugin};
use std::env;

mod diagnostic;
use diagnostic::diagnostic;
mod pam;
mod pipeline;

/// show warning message when SUDO_RS_IS_UNSTABLE is not set to the appropriate value
fn unstable_warning() {
    let check_var = std::env::var("SUDO_RS_IS_UNSTABLE").unwrap_or_else(|_| "".to_string());

    if check_var != "I accept that my system may break unexpectedly" {
        eprintln!(
            "WARNING!
Sudo-rs is in the early stages of development and could potentially break your system.
We recommend that you do not run this on any production environment. To turn off this
warning and start using sudo-rs set the environment variable SUDO_RS_IS_UNSTABLE to
the value `I accept that my system may break unexpectedly`. If you are unsure how to
do this then this software is not suited for you at this time."
        );

        std::process::exit(1);
    }
}

const VERSION: &str = env!("CARGO_PKG_VERSION");

#[derive(Default)]
pub(crate) struct SudoersPolicy {}

impl PolicyPlugin for SudoersPolicy {
    type PreJudgementPolicy = crate::sudoers::Sudoers;
    type Policy = crate::sudoers::Judgement;

    fn init(&mut self) -> Result<Self::PreJudgementPolicy, Error> {
        // TODO: move to global configuration
        let sudoers_path = "/etc/sudoers.test";

        let (sudoers, syntax_errors) = crate::sudoers::Sudoers::new(sudoers_path)
            .map_err(|e| Error::Configuration(format!("{e}")))?;

        for crate::sudoers::Error(pos, error) in syntax_errors {
            diagnostic!("{error}", sudoers_path @ pos);
        }

        Ok(sudoers)
    }

    fn judge(
        &mut self,
        pre: Self::PreJudgementPolicy,
        context: &Context,
    ) -> Result<Self::Policy, Error> {
        Ok(pre.check(
            &context.current_user,
            &context.hostname,
            crate::sudoers::Request {
                user: &context.target_user,
                group: &context.target_group,
                command: &context.command.command,
                arguments: &context.command.arguments,
            },
        ))
    }
}

fn sudo_process() -> Result<(), Error> {
    crate::log::SudoLogger::new("sudo: ").into_global_logger();

    dev_info!("development logs are enabled");

    let pipeline = Pipeline {
        policy: SudoersPolicy::default(),
        authenticator: PamAuthenticator::new_cli(),
    };

    // parse cli options
    match SudoOptions::from_env() {
        Ok(options) => match options.action {
            SudoAction::Help => {
                eprintln!("{}", help::long_help_message());
                std::process::exit(0);
            }
            SudoAction::Version => {
                eprintln!("sudo-rs {VERSION}");
                std::process::exit(0);
            }
            SudoAction::RemoveTimestamp => {
                let user = resolve_current_user()?;
                let mut record_file =
                    SessionRecordFile::open_for_user(&user.name, Duration::seconds(0))?;
                record_file.reset()?;
                Ok(())
            }
            SudoAction::ResetTimestamp => {
                if let Some(scope) = RecordScope::for_process(&Process::new()) {
                    let user = resolve_current_user()?;
                    let mut record_file =
                        SessionRecordFile::open_for_user(&user.name, Duration::seconds(0))?;
                    record_file.disable(scope, None)?;
                }
                Ok(())
            }
            SudoAction::Validate => pipeline.run_validate(options),
            SudoAction::Run(ref cmd) => {
                // special case for when no command is given
                if cmd.is_empty() && !options.shell && !options.login {
                    eprintln!("{}", help::USAGE_MSG);
                    std::process::exit(1);
                } else {
                    unstable_warning();

                    pipeline.run(options)
                }
            }
            SudoAction::List(_) => {
                unimplemented!();
            }
            SudoAction::Edit(_) => {
                unimplemented!();
            }
        },
        Err(e) => {
            eprintln!("{e}\n{}", help::USAGE_MSG);
            std::process::exit(1);
        }
    }
}

pub fn main() {
    match sudo_process() {
        Ok(()) => (),
        Err(error) => {
            diagnostic!("{error}");
            std::process::exit(1);
        }
    }
}