use axum::{
  Json,
  extract::{Path, State},
};
use pinakes_core::model::{CollectionKind, MediaId};
use uuid::Uuid;

use crate::{
  dto::{
    AddMemberRequest,
    CollectionResponse,
    CreateCollectionRequest,
    MediaResponse,
  },
  error::ApiError,
  state::AppState,
};

pub async fn create_collection(
  State(state): State<AppState>,
  Json(req): Json<CreateCollectionRequest>,
) -> Result<Json<CollectionResponse>, ApiError> {
  if req.name.is_empty() || req.name.len() > 255 {
    return Err(ApiError(
      pinakes_core::error::PinakesError::InvalidOperation(
        "collection name must be 1-255 characters".into(),
      ),
    ));
  }
  if let Some(ref desc) = req.description
    && desc.len() > 10_000
  {
    return Err(ApiError(
      pinakes_core::error::PinakesError::InvalidOperation(
        "description exceeds 10000 characters".into(),
      ),
    ));
  }
  let kind = match req.kind.as_str() {
    "virtual" => CollectionKind::Virtual,
    _ => CollectionKind::Manual,
  };
  let col = pinakes_core::collections::create_collection(
    &state.storage,
    &req.name,
    kind,
    req.description.as_deref(),
    req.filter_query.as_deref(),
  )
  .await?;

  state.emit_plugin_event(
    "CollectionCreated",
    &serde_json::json!({
        "id": col.id.to_string(),
        "name": col.name,
    }),
  );

  Ok(Json(CollectionResponse::from(col)))
}

pub async fn list_collections(
  State(state): State<AppState>,
) -> Result<Json<Vec<CollectionResponse>>, ApiError> {
  let cols = state.storage.list_collections().await?;
  Ok(Json(
    cols.into_iter().map(CollectionResponse::from).collect(),
  ))
}

pub async fn get_collection(
  State(state): State<AppState>,
  Path(id): Path<Uuid>,
) -> Result<Json<CollectionResponse>, ApiError> {
  let col = state.storage.get_collection(id).await?;
  Ok(Json(CollectionResponse::from(col)))
}

pub async fn delete_collection(
  State(state): State<AppState>,
  Path(id): Path<Uuid>,
) -> Result<Json<serde_json::Value>, ApiError> {
  state.storage.delete_collection(id).await?;

  state.emit_plugin_event(
    "CollectionDeleted",
    &serde_json::json!({"id": id.to_string()}),
  );

  Ok(Json(serde_json::json!({"deleted": true})))
}

pub async fn add_member(
  State(state): State<AppState>,
  Path(collection_id): Path<Uuid>,
  Json(req): Json<AddMemberRequest>,
) -> Result<Json<serde_json::Value>, ApiError> {
  pinakes_core::collections::add_member(
    &state.storage,
    collection_id,
    MediaId(req.media_id),
    req.position.unwrap_or(0),
  )
  .await?;
  Ok(Json(serde_json::json!({"added": true})))
}

pub async fn remove_member(
  State(state): State<AppState>,
  Path((collection_id, media_id)): Path<(Uuid, Uuid)>,
) -> Result<Json<serde_json::Value>, ApiError> {
  pinakes_core::collections::remove_member(
    &state.storage,
    collection_id,
    MediaId(media_id),
  )
  .await?;
  Ok(Json(serde_json::json!({"removed": true})))
}

pub async fn get_members(
  State(state): State<AppState>,
  Path(collection_id): Path<Uuid>,
) -> Result<Json<Vec<MediaResponse>>, ApiError> {
  let items =
    pinakes_core::collections::get_members(&state.storage, collection_id)
      .await?;
  let roots = state.config.read().await.directories.roots.clone();
  Ok(Json(
    items
      .into_iter()
      .map(|item| MediaResponse::new(item, &roots))
      .collect(),
  ))
}