use crate::db::{self, DbPool, Folder, ImageRecord};
use crate::indexer;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;
use tauri::{AppHandle, State};

pub type DbState = DbPool;

#[derive(Serialize)]
pub struct ImagesPage {
    pub images: Vec<ImageRecord>,
    pub total: i64,
    pub offset: i64,
    pub limit: i64,
}

#[derive(Deserialize)]
pub struct GetImagesParams {
    pub folder_id: Option<i64>,
    pub search: Option<String>,
    pub media_kind: Option<String>,
    pub favorites_only: Option<bool>,
    pub sort: Option<String>,
    pub offset: Option<i64>,
    pub limit: Option<i64>,
}

#[derive(Deserialize)]
pub struct UpdateImageDetailsParams {
    pub image_id: i64,
    pub favorite: Option<bool>,
    pub rating: Option<i64>,
}

#[tauri::command]
pub async fn add_folder(
    app: AppHandle,
    db: State<'_, DbState>,
    path: String,
) -> Result<Folder, String> {
    let folder_path = PathBuf::from(&path);

    if !folder_path.exists() || !folder_path.is_dir() {
        return Err("Path is not a valid directory".into());
    }

    let name = folder_path
        .file_name()
        .map(|n| n.to_string_lossy().to_string())
        .unwrap_or_else(|| path.clone());

    let folder_id = {
        let conn = db.get().map_err(|e| e.to_string())?;
        db::insert_folder(&conn, &path, &name).map_err(|e| e.to_string())?
    };

    let folders = {
        let conn = db.get().map_err(|e| e.to_string())?;
        db::get_folders(&conn).map_err(|e| e.to_string())?
    };

    let folder = folders
        .into_iter()
        .find(|f| f.id == folder_id)
        .ok_or("Folder not found after insert")?;

    indexer::index_folder(app, db.inner().clone(), folder_id, folder_path);

    Ok(folder)
}

#[tauri::command]
pub async fn get_folders(db: State<'_, DbState>) -> Result<Vec<Folder>, String> {
    let conn = db.get().map_err(|e| e.to_string())?;
    db::get_folders(&conn).map_err(|e| e.to_string())
}

#[tauri::command]
pub async fn remove_folder(db: State<'_, DbState>, folder_id: i64) -> Result<(), String> {
    let conn = db.get().map_err(|e| e.to_string())?;
    db::delete_folder(&conn, folder_id).map_err(|e| e.to_string())
}

#[tauri::command]
pub async fn get_images(
    db: State<'_, DbState>,
    params: GetImagesParams,
) -> Result<ImagesPage, String> {
    let conn = db.get().map_err(|e| e.to_string())?;

    let sort = params.sort.as_deref().unwrap_or("date_desc");
    let offset = params.offset.unwrap_or(0);
    let limit = params.limit.unwrap_or(100);
    let search = params.search.as_deref();
    let media_kind = params.media_kind.as_deref();
    let favorites_only = params.favorites_only.unwrap_or(false);

    let total = db::count_images(&conn, params.folder_id, search, media_kind, favorites_only)
        .map_err(|e| e.to_string())?;

    let images = db::get_images(
        &conn,
        params.folder_id,
        search,
        media_kind,
        favorites_only,
        sort,
        offset,
        limit,
    )
    .map_err(|e| e.to_string())?;

    Ok(ImagesPage {
        images,
        total,
        offset,
        limit,
    })
}

#[tauri::command]
pub async fn update_image_details(
    db: State<'_, DbState>,
    params: UpdateImageDetailsParams,
) -> Result<ImageRecord, String> {
    let conn = db.get().map_err(|e| e.to_string())?;
    db::update_image_details(&conn, params.image_id, params.favorite, params.rating)
        .map_err(|e| e.to_string())
}

#[tauri::command]
pub async fn reindex_folder(
    app: AppHandle,
    db: State<'_, DbState>,
    folder_id: i64,
) -> Result<(), String> {
    let folder_path = {
        let conn = db.get().map_err(|e| e.to_string())?;
        let folders = db::get_folders(&conn).map_err(|e| e.to_string())?;
        folders
            .into_iter()
            .find(|f| f.id == folder_id)
            .map(|f| PathBuf::from(f.path))
            .ok_or("Folder not found")?
    };

    indexer::index_folder(app, db.inner().clone(), folder_id, folder_path);
    Ok(())
}