use actix_web::{HttpRequest, HttpResponse, web};

use shanty_db::queries;

use crate::state::AppState;

use super::helpers::{authenticate, get_query_param, parse_subsonic_id};
use super::response::{self, SubsonicChild};

/// GET /rest/getPlaylists[.view]
pub async fn get_playlists(req: HttpRequest, state: web::Data<AppState>) -> HttpResponse {
    let (params, user) = match authenticate(&req, &state).await {
        Ok(v) => v,
        Err(resp) => return resp,
    };

    let playlists = queries::playlists::list(state.db.conn(), Some(user.id))
        .await
        .unwrap_or_default();

    let mut playlist_list: Vec<serde_json::Value> = Vec::new();
    for pl in &playlists {
        let track_count = queries::playlists::get_track_count(state.db.conn(), pl.id)
            .await
            .unwrap_or(0);

        // Calculate total duration
        let tracks = queries::playlists::get_tracks(state.db.conn(), pl.id)
            .await
            .unwrap_or_default();
        let duration: i32 = tracks
            .iter()
            .filter_map(|t| t.duration.map(|d| d as i32))
            .sum();

        let mut pl_json = serde_json::json!({
            "id": format!("pl-{}", pl.id),
            "name": pl.name,
            "owner": user.username,
            "public": false,
            "songCount": track_count,
            "duration": duration,
            "created": pl.created_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
            "changed": pl.updated_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
        });
        if let Some(ref desc) = pl.description {
            pl_json["comment"] = serde_json::json!(desc);
        }
        playlist_list.push(pl_json);
    }

    response::ok(
        &params.format,
        serde_json::json!({
            "playlists": {
                "playlist": playlist_list,
            }
        }),
    )
}

/// GET /rest/getPlaylist[.view]
pub async fn get_playlist(req: HttpRequest, state: web::Data<AppState>) -> HttpResponse {
    let (params, user) = match authenticate(&req, &state).await {
        Ok(v) => v,
        Err(resp) => return resp,
    };

    let id_str = match get_query_param(&req, "id") {
        Some(id) => id,
        None => {
            return response::error(
                &params.format,
                response::ERROR_MISSING_PARAM,
                "missing required parameter: id",
            );
        }
    };

    let (_prefix, playlist_id) = match parse_subsonic_id(&id_str) {
        Some(v) => v,
        None => {
            return response::error(
                &params.format,
                response::ERROR_NOT_FOUND,
                "invalid playlist id",
            );
        }
    };

    let playlist = match queries::playlists::get_by_id(state.db.conn(), playlist_id).await {
        Ok(p) => p,
        Err(_) => {
            return response::error(
                &params.format,
                response::ERROR_NOT_FOUND,
                "playlist not found",
            );
        }
    };

    let tracks = queries::playlists::get_tracks(state.db.conn(), playlist_id)
        .await
        .unwrap_or_default();

    let duration: i32 = tracks
        .iter()
        .filter_map(|t| t.duration.map(|d| d as i32))
        .sum();

    let entry_list: Vec<serde_json::Value> = tracks
        .iter()
        .map(|track| serde_json::to_value(SubsonicChild::from_track(track)).unwrap_or_default())
        .collect();

    let mut pl_json = serde_json::json!({
        "id": format!("pl-{}", playlist.id),
        "name": playlist.name,
        "owner": user.username,
        "public": false,
        "songCount": tracks.len(),
        "duration": duration,
        "created": playlist.created_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
        "changed": playlist.updated_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
        "entry": entry_list,
    });
    if let Some(ref desc) = playlist.description {
        pl_json["comment"] = serde_json::json!(desc);
    }

    response::ok(
        &params.format,
        serde_json::json!({
            "playlist": pl_json,
        }),
    )
}

/// GET /rest/createPlaylist[.view]
pub async fn create_playlist(req: HttpRequest, state: web::Data<AppState>) -> HttpResponse {
    let (params, user) = match authenticate(&req, &state).await {
        Ok(v) => v,
        Err(resp) => return resp,
    };

    let name = match get_query_param(&req, "name") {
        Some(n) => n,
        None => {
            return response::error(
                &params.format,
                response::ERROR_MISSING_PARAM,
                "missing required parameter: name",
            );
        }
    };

    // Collect songId params (can be repeated)
    let qs = req.query_string();
    let query_params: Vec<(String, String)> = serde_urlencoded::from_str(qs).unwrap_or_default();
    let track_ids: Vec<i32> = query_params
        .iter()
        .filter(|(k, _)| k == "songId")
        .filter_map(|(_, v)| parse_subsonic_id(v).map(|(_, id)| id))
        .collect();

    match queries::playlists::create(state.db.conn(), &name, None, Some(user.id), &track_ids).await
    {
        Ok(playlist) => {
            let tracks = queries::playlists::get_tracks(state.db.conn(), playlist.id)
                .await
                .unwrap_or_default();
            let duration: i32 = tracks
                .iter()
                .filter_map(|t| t.duration.map(|d| d as i32))
                .sum();
            let entry_list: Vec<serde_json::Value> = tracks
                .iter()
                .map(|track| {
                    serde_json::to_value(SubsonicChild::from_track(track)).unwrap_or_default()
                })
                .collect();

            let mut pl_json = serde_json::json!({
                "id": format!("pl-{}", playlist.id),
                "name": playlist.name,
                "owner": user.username,
                "public": false,
                "songCount": tracks.len(),
                "duration": duration,
                "created": playlist.created_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
                "changed": playlist.updated_at.format("%Y-%m-%dT%H:%M:%S").to_string(),
                "entry": entry_list,
            });
            if let Some(ref desc) = playlist.description {
                pl_json["comment"] = serde_json::json!(desc);
            }

            response::ok(
                &params.format,
                serde_json::json!({
                    "playlist": pl_json,
                }),
            )
        }
        Err(e) => response::error(
            &params.format,
            response::ERROR_GENERIC,
            &format!("failed to create playlist: {e}"),
        ),
    }
}

/// GET /rest/deletePlaylist[.view]
pub async fn delete_playlist(req: HttpRequest, state: web::Data<AppState>) -> HttpResponse {
    let (params, _user) = match authenticate(&req, &state).await {
        Ok(v) => v,
        Err(resp) => return resp,
    };

    let id_str = match get_query_param(&req, "id") {
        Some(id) => id,
        None => {
            return response::error(
                &params.format,
                response::ERROR_MISSING_PARAM,
                "missing required parameter: id",
            );
        }
    };

    let (_prefix, playlist_id) = match parse_subsonic_id(&id_str) {
        Some(v) => v,
        None => {
            return response::error(
                &params.format,
                response::ERROR_NOT_FOUND,
                "invalid playlist id",
            );
        }
    };

    match queries::playlists::delete(state.db.conn(), playlist_id).await {
        Ok(()) => response::ok(&params.format, serde_json::json!({})),
        Err(e) => response::error(
            &params.format,
            response::ERROR_GENERIC,
            &format!("failed to delete playlist: {e}"),
        ),
    }
}