use std::env::{set_current_dir as cd, set_var};
use structopt::StructOpt;
// For UNIX extended metadata

mod cli;
mod db;
mod dvcs;
mod log;
mod task;

use log::Context;

fn main() -> Result<(), std::io::Error> {
    // TODO: use StructOpt::from_iter_safe so we can hook on Cli error
    // to display additional unknown_arg error message.
    let cmd = cli::Cli::from_args();

    let mut context = Context::new();

    let basedir = cmd.basedir();
    context.insert("$i18n_basedir".to_string(), basedir.to_str().unwrap().to_string());

    let basedir = match basedir.canonicalize() {
        Ok(p) => {
            context.insert("$i18n_basedir".to_string(), p.to_str().unwrap().to_string());
            p
        },
        Err(_) => {
            log::error("missing_basedir", &context);
            std::process::exit(1);
        }
    };

    let basedir_str = basedir.to_str().unwrap().to_string();

    set_var("GITBUILDDIR", &basedir);

    let mut tasks = if cmd.tasks.is_empty() {
        log::info("no_task", &context);
        task::from_dir(&basedir, &context).expect("Could not load DB")
    } else {
        match task::from_dir_and_list(&basedir, cmd.tasks, &context) {
            Ok(t) => t,
            Err(task::MissingTask(t)) => {
                // Temporarily override the global context
                let mut context = context.clone();
                context.insert("$i18n_task".to_string(), t);
                log::error("unknown_arg", &context);
                std::process::exit(1);
            }
            
        }
    };

    // Reorder tasks alphanumerically
    tasks.sort_unstable_by_key(|t| t.name.clone());
    // Remove duplicates, in case a task was called along
    // the corresponding source URL (so we'd be tempted to call the task twice)
    tasks.dedup_by_key(|t| t.name.clone());

    for t in &tasks {
        t.debug("found_task");
    }

    let (config_folder, ignored_tasks) = task::config(&basedir);
    set_var("FORGEBUILDCONF", &config_folder);
    context.insert("$i18n_config".to_string(), config_folder.to_str().unwrap().to_string());
    log::info("config", &context);

    for task in &tasks {
        task.debug("start_proc");
        
        if ignored_tasks.contains(&task.name) {
            // Skip task which has CONFIG/task.ignore
            continue;
        }

        task.info("process");

        // Maybe the task has a source we should clone?
        if let Some(repo) = &task.repo {
            let source_dir = format!("{}/.{}", basedir_str, &task.name);
            if task.cloned == false {
                task.info("clone");
                if !repo.clone() {
                    task.error("clone_failed");
                    // Skip further processing
                    continue;
                }
                // New repo just cloned
                // TODO: submodule and submodule updates
                cd(&source_dir).expect("Failed to change working dir");

                // Checkout specific branch?
                task.checkout();
                task.run();
            } else {
                // So the cloned repo is already here maybe update?
                // Let's say there was an update and run
                //println!("Task {} already exists, run i t only if updates", task.name);
                cd(&source_dir).expect("Failed to change working dir");
                task.checkout();
                task.update_and_run(&cmd.force);
                //task.run();
            }
        } else {
            // No source, chaneg working dir to basedir
            cd(&basedir).expect("Failed to change working dir");
            //println!("Taks {} doesn't have a source, run it", task.name);
            task.run_once();
        }
    }
    Ok(())
}