use anyhow::{Context, Error, Result, anyhow};
use clap::*;
use clap::error::ErrorKind;
use log::*;

use directories::ProjectDirs;

use keep::args::{Args, NumberOrString};
use keep::config::Settings;
use keep::db;
use keep::modes;

/**
 * Main function to handle command-line arguments and execute the appropriate mode.
 */
fn main() -> Result<(), Error> {
    use std::fs;
    let proj_dirs = ProjectDirs::from("gt0.ca", "Andrew Phillips", "Keep");

    let mut cmd = Args::command();
    let args = Args::parse();
    
    // Validate arguments based on mode
    if let Err(e) = args.validate() {
        cmd.error(ErrorKind::ValueValidation, e).exit();
    }

    stderrlog::new()
        .module(module_path!())
        .quiet(args.options.quiet)
        .verbosity(usize::from(args.options.verbose + 2))
        //.timestamp(stderrlog::Timestamp::Second)
        .init()
        .unwrap();

    debug!("MAIN: Start");

    // Determine default data directory
    let default_dir = match proj_dirs {
        Some(ref proj_dirs) => proj_dirs.data_dir().to_path_buf(),
        None => return Err(anyhow!("Unable to determine data directory")),
    };

    // Create unified settings using the new config system
    let settings = Settings::new(&args, default_dir)?;
    
    debug!("MAIN: Loaded settings: {:?}", settings);

    let ids = &mut Vec::new();
    let tags = &mut Vec::new();

    // For --info and --get modes, treat numeric strings as IDs
    for v in args.ids_or_tags.iter() {
        debug!("MAIN: Parsed value: {:?}", v);
        match v.clone() {
            NumberOrString::Number(num) => {
                debug!("MAIN: Adding to ids: {}", num);
                ids.push(num)
            },
            NumberOrString::Str(str) => {
                // For --info and --get, try to parse strings as numbers to treat them as IDs
                if args.mode.info || args.mode.get {
                    if let Ok(num) = str.parse::<i64>() {
                        debug!("MAIN: Adding parsed string to ids: {}", num);
                        ids.push(num);
                        continue;
                    } else if args.mode.info {
                        // --info only accepts numeric IDs
                        cmd.error(
                            ErrorKind::InvalidValue,
                            format!("--info requires numeric IDs, found: '{}'", str)
                        ).exit();
                    }
                }
                // If not a number, or not using --info/--get, treat as tag
                debug!("MAIN: Adding to tags: {}", str);
                tags.push(str)
            },
        }
    }
    tags.sort();
    tags.dedup();

    #[derive(PartialEq, Debug)]
    enum KeepModes {
        Unknown,
        Save,
        Get,
        Diff,
        List,
        Delete,
        Info,
        Status,
        Server,
        GenerateConfig,
    }

    let mut mode: KeepModes = KeepModes::Unknown;

    if args.mode.save {
        mode = KeepModes::Save;
    } else if args.mode.get {
        mode = KeepModes::Get;
    } else if args.mode.diff {
        mode = KeepModes::Diff;
    } else if args.mode.list {
        mode = KeepModes::List;
    } else if args.mode.delete {
        mode = KeepModes::Delete;
    } else if args.mode.info {
        mode = KeepModes::Info;
    } else if args.mode.status {
        mode = KeepModes::Status;
    } else if args.mode.server {
        mode = KeepModes::Server;
    } else if args.mode.generate_config {
        mode = KeepModes::GenerateConfig;
    }

    if mode == KeepModes::Unknown {
        if !ids.is_empty() {
            mode = KeepModes::Get;
        } else {
            mode = KeepModes::Save;
        }
    }

    // Validate output format usage
    if let Some(output_format_str) = &settings.output_format {
        if output_format_str != "table" && mode != KeepModes::Info && mode != KeepModes::Status && mode != KeepModes::List {
            cmd.error(
                ErrorKind::InvalidValue,
                "--output-format can only be used with --info, --status, or --list modes"
            ).exit();
        }
    }

    // Validate human-readable usage
    if settings.human_readable && mode != KeepModes::List && mode != KeepModes::Info {
        cmd.error(
            ErrorKind::InvalidValue,
            "--human-readable can only be used with --list and --info modes"
        ).exit();
    }

    // Validate server password usage
    if settings.server_password().is_some() && mode != KeepModes::Server {
        cmd.error(
            ErrorKind::InvalidValue,
            "--server-password can only be used with --server mode"
        ).exit();
    }

    debug!("MAIN: args: {:?}", args);
    debug!("MAIN: ids: {:?}", ids);
    debug!("MAIN: tags: {:?}", tags);
    debug!("MAIN: mode: {:?}", mode);
    debug!("MAIN: settings: {:?}", settings);

    unsafe {
        libc::umask(0o077);
    }

    let data_path = settings.dir.clone();
    let mut db_path = data_path.clone();
    db_path.push("keep-1.db");

    debug!("MAIN: Data directory: {:?}", data_path);
    debug!("MAIN: DB file: {:?}", db_path);

    // Ensure data directory exists
    fs::create_dir_all(&data_path)
        .with_context(|| format!("Unable to create data directory {:?}", data_path))?;

    // Initialize database
    let mut conn = db::open(db_path.clone())?;

    match mode {
        KeepModes::Save => modes::save::mode_save(&mut cmd, &settings, ids, tags, &mut conn, data_path),
        KeepModes::Get => modes::get::mode_get(&mut cmd, &settings, ids, tags, &mut conn, data_path),
        KeepModes::Diff => modes::diff::mode_diff(&mut cmd, &settings, &settings, ids, tags, &mut conn, data_path),
        KeepModes::List => modes::list::mode_list(&mut cmd, &settings, ids, tags, &mut conn, data_path),
        KeepModes::Delete => modes::delete::mode_delete(&mut cmd, &settings, &settings, ids, tags, &mut conn, data_path),
        KeepModes::Info => modes::info::mode_info(&mut cmd, &settings, ids, tags, &mut conn, data_path),
        KeepModes::Status => modes::status::mode_status(&mut cmd, &settings, data_path, db_path),
        KeepModes::Server => modes::server::mode_server(&mut cmd, &settings, &mut conn, data_path),
        KeepModes::GenerateConfig => modes::generate_config::mode_generate_config(&mut cmd, &settings),
        KeepModes::Unknown => unreachable!(),
    }
}