use derive::FromVec;
use heromodels::db::Db;
use macros::{
    register_authorized_create_by_id_fn, register_authorized_delete_by_id_fn,
    register_authorized_get_by_id_fn, register_authorized_list_fn,
};
use rhai::plugin::*;
use rhai::{CustomType, Dynamic, Engine, EvalAltResult, Module, Position, TypeBuilder};
use serde::Serialize;
use serde_json;
use std::mem;
use std::sync::Arc;

use heromodels::db::hero::OurDB;
use heromodels::db::Collection as DbCollectionTrait;
use heromodels::models::library::collection::Collection as RhaiCollection;
use heromodels::models::library::items::{
    Book as RhaiBook, Image as RhaiImage, Markdown as RhaiMarkdown, Pdf as RhaiPdf,
    Slide as RhaiSlide, Slideshow as RhaiSlideshow, TocEntry as RhaiTocEntry,
};

/// Registers a `.json()` method for any type `T` that implements the required traits.
fn register_json_method<T>(engine: &mut Engine)
where
    T: CustomType + Clone + Serialize,
{
    let to_json_fn = |obj: &mut T| -> Result<String, Box<EvalAltResult>> {
        match serde_json::to_string_pretty(obj) {
            Ok(json_str) => Ok(json_str),
            Err(e) => Err(format!("Failed to serialize to JSON: {}", e).into()),
        }
    };
    engine.register_fn("json", to_json_fn);
}

// Wrapper types for arrays
#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "CollectionArray")]
pub struct RhaiCollectionArray(pub Vec<RhaiCollection>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "ImageArray")]
pub struct RhaiImageArray(pub Vec<RhaiImage>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "PdfArray")]
pub struct RhaiPdfArray(pub Vec<RhaiPdf>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "MarkdownArray")]
pub struct RhaiMarkdownArray(pub Vec<RhaiMarkdown>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "BookArray")]
pub struct RhaiBookArray(pub Vec<RhaiBook>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "SlideshowArray")]
pub struct RhaiSlideshowArray(pub Vec<RhaiSlideshow>);

#[derive(Debug, Clone, Serialize, CustomType, FromVec)]
#[rhai_type(name = "TocEntryArray")]
pub struct RhaiTocEntryArray(pub Vec<RhaiTocEntry>);

#[export_module]
mod rhai_library_module {
    use super::*;

    // --- Collection Functions ---
    #[rhai_fn(name = "new_collection", return_raw)]
    pub fn new_collection() -> Result<RhaiCollection, Box<EvalAltResult>> {
        Ok(RhaiCollection::new())
    }

    #[rhai_fn(name = "collection_title", return_raw)]
    pub fn collection_title(
        collection: &mut RhaiCollection,
        title: String,
    ) -> Result<RhaiCollection, Box<EvalAltResult>> {
        let owned = std::mem::take(collection);
        *collection = owned.title(title);
        Ok(collection.clone())
    }

    #[rhai_fn(name = "collection_description", return_raw)]
    pub fn collection_description(
        collection: &mut RhaiCollection,
        description: String,
    ) -> Result<RhaiCollection, Box<EvalAltResult>> {
        let owned = std::mem::take(collection);
        *collection = owned.description(description);
        Ok(collection.clone())
    }

    #[rhai_fn(name = "get_collection_id")]
    pub fn get_collection_id(collection: &mut RhaiCollection) -> i64 {
        collection.id() as i64
    }

    #[rhai_fn(name = "get_collection_title")]
    pub fn get_collection_title(collection: &mut RhaiCollection) -> String {
        collection.title().clone()
    }

    // --- Image Functions ---
    #[rhai_fn(name = "new_image", return_raw)]
    pub fn new_image() -> Result<RhaiImage, Box<EvalAltResult>> {
        Ok(RhaiImage::new())
    }

    #[rhai_fn(name = "image_title", return_raw)]
    pub fn image_title(
        image: &mut RhaiImage,
        title: String,
    ) -> Result<RhaiImage, Box<EvalAltResult>> {
        let owned = std::mem::take(image);
        *image = owned.title(title);
        Ok(image.clone())
    }

    #[rhai_fn(name = "get_image_id")]
    pub fn get_image_id(image: &mut RhaiImage) -> i64 {
        image.id() as i64
    }

    // Additional functions would continue here...
}

pub fn register_library_rhai_module(engine: &mut Engine) {
    let mut module = exported_module!(rhai_library_module);

    register_json_method::<RhaiCollection>(engine);
    register_json_method::<RhaiImage>(engine);
    register_json_method::<RhaiPdf>(engine);
    register_json_method::<RhaiMarkdown>(engine);
    register_json_method::<RhaiBook>(engine);
    register_json_method::<RhaiSlideshow>(engine);
    register_json_method::<RhaiTocEntry>(engine);
    register_json_method::<RhaiCollectionArray>(engine);

    register_authorized_create_by_id_fn!(
        module: &mut module,
        rhai_fn_name: "save_collection",
        resource_type_str: "Collection",
        rhai_return_rust_type: heromodels::models::library::collection::Collection
    );

    register_authorized_get_by_id_fn!(
        module: &mut module,
        rhai_fn_name: "get_collection",
        resource_type_str: "Collection",
        rhai_return_rust_type: heromodels::models::library::collection::Collection
    );

    engine.register_global_module(module.into());
}