mod api;

use lazy_static::lazy_static;
use okapi::openapi3::{Object, Responses, SecurityRequirement, SecurityScheme, SecuritySchemeData};
use rocket::{
    fairing, fairing::AdHoc, http::Status, request, request::FromRequest, response,
    response::Responder, serde, Build, Request, Rocket,
};
use rocket_db_pools::{sqlx, Database};
use rocket_okapi::{
    gen::OpenApiGenerator,
    mount_endpoints_and_merged_docs, openapi, openapi_get_routes,
    rapidoc::*,
    request::{OpenApiFromRequest, RequestHeaderInput},
    response::OpenApiResponderInner,
    settings::{OpenApiSettings, UrlObject},
    swagger_ui::{make_swagger_ui, SwaggerUIConfig},
};

#[macro_use]
extern crate rocket;

use schemars::JsonSchema;
use thiserror::Error;

/*
const API_KEYS: [&'static str; 3] = [
    "7de10bf6-278d-11ed-ad60-a8a15919d1b3",
    "89eb06e0-278d-11ed-9b29-a8a15919d1b3",
    "8a35ba14-278d-11ed-a200-a8a15919d1b3",
];
*/

lazy_static! {
    static ref API_KEYS: Vec<String> = {
        serde_json::from_str(
            &std::fs::read_to_string("api_keys.json").expect("api_keys.json does not exist"),
        )
        .expect("api_keys.json is not valid")
    };
}

#[derive(Error, Debug)]
pub enum PartyError {
    #[error("user `{0}` does not exist")]
    UserNotFound(i64),
    #[error("unknown error: {0}")]
    Unknown(String),
    #[error("invalid parameter: {0}")]
    InvalidParameter(String),
    #[error("uuid error {source:?}")]
    UuidError {
        #[from]
        source: uuid::Error,
    },
    #[error("sqlx error {source:?}")]
    SqlxError {
        #[from]
        source: sqlx::Error,
    },
}

impl OpenApiResponderInner for PartyError {
    fn responses(
        _gen: &mut rocket_okapi::gen::OpenApiGenerator,
    ) -> rocket_okapi::Result<okapi::openapi3::Responses> {
        Ok(okapi::openapi3::Responses::default())
    }
}

impl<'r, 'o: 'r> Responder<'r, 'o> for PartyError {
    fn respond_to(self, req: &'r Request<'_>) -> response::Result<'o> {
        match self {
            Self::UserNotFound(_) => Status::NotFound,
            _ => Status::InternalServerError,
        }
        .respond_to(req)
    }
}

/// # Ordering
///
/// Ordering of data in an array, ascending or descending
#[derive(Clone, Debug, FromFormField, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum Ordering {
    #[field(value = "desc")]
    Desc,
    #[field(value = "asc")]
    Asc,
}

impl ToString for Ordering {
    fn to_string(&self) -> String {
        match self {
            Self::Desc => "DESC",
            Self::Asc => "ASC",
        }
        .into()
    }
}

#[derive(Database)]
#[database("party")]
pub struct Db(sqlx::SqlitePool);

#[derive(Clone, Copy, Debug)]
pub struct ApiKey;

#[rocket::async_trait]
impl<'r> FromRequest<'r> for ApiKey {
    type Error = ApiKey;

    async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, Self::Error> {
        if req
            .headers()
            .get("X-API-Key")
            .any(|k| API_KEYS.contains(&String::from(k)))
        {
            request::Outcome::Success(ApiKey)
        } else {
            request::Outcome::Failure((Status::Unauthorized, ApiKey))
        }
    }
}

impl<'a> OpenApiFromRequest<'a> for ApiKey {
    fn from_request_input(
        _gen: &mut OpenApiGenerator,
        _name: String,
        _required: bool,
    ) -> rocket_okapi::Result<RequestHeaderInput> {
        // Setup global requirement for Security scheme
        let security_scheme = SecurityScheme {
            description: Some("Requires an API key to access".to_owned()),
            // Setup data requirements.
            // This can be part of the `header`, `query` or `cookie`.
            // In this case the header `x-api-key: mykey` needs to be set.
            data: SecuritySchemeData::ApiKey {
                name: "x-api-key".to_owned(),
                location: "header".to_owned(),
            },
            extensions: Object::default(),
        };
        // Add the requirement for this route/endpoint
        // This can change between routes.
        let mut security_req = SecurityRequirement::new();
        // Each security requirement needs to be met before access is allowed.
        security_req.insert("ApiKeyAuth".to_owned(), Vec::new());
        // These vvvvvvv-----^^^^^^^^^^ values need to match exactly!
        Ok(RequestHeaderInput::Security(
            "ApiKeyAuth".to_owned(),
            security_scheme,
            security_req,
        ))
    }
}

#[openapi]
#[get("/")]
fn index() -> String {
    format!("Hello, world!")
}

fn get_docs() -> SwaggerUIConfig {
    SwaggerUIConfig {
        url: "../api/openapi.json".to_owned(),
        ..Default::default()
    }
}

async fn run_migrations(rocket: Rocket<Build>) -> fairing::Result {
    match Db::fetch(&rocket) {
        Some(db) => match sqlx::migrate!("db/migrations").run(&**db).await {
            Ok(_) => {
                println!("Migrations completed");
                Ok(rocket)
            }
            Err(e) => {
                error!("Failed to initialize SQLx database: {}", e);
                Err(rocket)
            }
        },
        None => Err(rocket),
    }
}

#[launch]
fn rocket() -> _ {
    println!("{:#?}", API_KEYS.len());
    let mut building_rocket = rocket::build()
        .attach(Db::init())
        .attach(AdHoc::try_on_ignite("SQLx Migrations", run_migrations))
        .mount("/", routes![index])
        .mount("/swagger", make_swagger_ui(&get_docs()))
        .mount(
            "/rapidoc/",
            make_rapidoc(&RapiDocConfig {
                general: GeneralConfig {
                    spec_urls: vec![UrlObject::new("General", "../api/openapi.json")],
                    ..Default::default()
                },
                hide_show: HideShowConfig {
                    allow_spec_url_load: false,
                    allow_spec_file_load: false,
                    ..Default::default()
                },
                ..Default::default()
            }),
        );

    let openapi_settings = OpenApiSettings::default();
    mount_endpoints_and_merged_docs! {
        building_rocket, "/api".to_owned(), openapi_settings,
        "/user" => api::user::get_routes_and_docs(&openapi_settings),
    };

    building_rocket
}