mod files;
mod history;
mod metadata;
mod settings;

use renamr_core::format::ExpressionFormat;
use renamr_core::matching::{self, EpisodeGuess, MovieGuess};
use renamr_core::rename::{self, RenamePlanItem, RenameResult};
use renamr_core::string_bindings;
use std::collections::HashMap;
use tauri::AppHandle;

/// Renders a naming-scheme expression against a set of binding values.
/// This is the Tauri-facing entry point into the core format engine, used by the
/// rename-preview panel in the UI so users see live results as they edit a pattern.
#[tauri::command]
fn render_expression(expression: String, bindings: HashMap<String, String>) -> Result<String, String> {
    let compiled = ExpressionFormat::compile(&expression).map_err(|e| e.to_string())?;
    compiled
        .format(&string_bindings(bindings))
        .map_err(|e| e.to_string())
}

/// Guesses a season/episode number pair (and series name) from a filename using local
/// regex patterns only - no network calls, no metadata lookup. Returns `None` when the
/// filename doesn't carry a recognizable season/episode marker (movies, already-clean
/// names, etc).
#[tauri::command]
fn guess_episode(filename: String) -> Option<EpisodeGuess> {
    matching::guess_episode(&filename)
}

/// Guesses a movie title (and release year, if present) from a filename using local
/// regex/heuristic patterns only - no network calls. Callers should try
/// `guess_episode` first and only fall back to this when it returns `None`; see
/// `matching::guess_movie` for why.
#[tauri::command]
fn guess_movie(filename: String) -> Option<MovieGuess> {
    matching::guess_movie(&filename)
}

/// Executes a batch of planned on-disk renames (optionally moving files into
/// subfolders - see `renamr_core::rename`; conflicting targets are always skipped,
/// never overwritten). The UI is expected to have already shown the user the full
/// old-path/new-path plan and gotten explicit confirmation before calling this.
/// Runs off the main thread since real filesystem I/O shouldn't block the UI.
///
/// Every successfully-renamed item is recorded to the rename history log afterward
/// (see `history::record_batch`) so it can be undone later from the History panel.
#[tauri::command]
async fn execute_rename(app: AppHandle, items: Vec<RenamePlanItem>) -> Vec<RenameResult> {
    let results = tauri::async_runtime::spawn_blocking(move || rename::execute_renames(&items))
        .await
        .unwrap_or_default();
    history::record_batch(&app, &results);
    results
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    tauri::Builder::default()
        .plugin(tauri_plugin_dialog::init())
        .invoke_handler(tauri::generate_handler![
            render_expression,
            guess_episode,
            guess_movie,
            execute_rename,
            metadata::fetch_metadata,
            metadata::fetch_movie_metadata,
            settings::get_tmdb_token,
            settings::save_tmdb_token,
            history::list_rename_history,
            history::undo_rename_batch,
            files::pick_files,
            files::pick_folder,
            files::expand_dropped_paths,
        ])
        .run(tauri::generate_context!())
        .expect("error while running Renamr");
}