use crate::hashing;
use crate::repo;
use crate::token_stuff;

pub mod request {
    use serde::Deserialize;
    #[derive(Default, Deserialize, utoipa::ToSchema)]
    pub struct LoginRequest {
        pub username: String,
        pub password: String,
    }
}

pub mod response {
    use serde::Deserialize;
    #[derive(Default, Deserialize, utoipa::ToSchema)]
    pub struct LoginResponse {
        pub message: String,
        pub data: Vec<textsender_models::token::LoginResult>,
    }
}

/// Endpoint for a user login
#[utoipa::path(
    post,
    path = super::endpoints::LOGIN,
    request_body(
        content = request::LoginRequest,
        description = "Data required for a user to lgoin",
        content_type = "application/json"
    ),
    responses(
        (status = 201, description = "User login successful", body = response::LoginResponse),
        (status = 400, description = "Bad data", body = response::LoginResponse),
        (status = 500, description = "Something went wrong", body = response::LoginResponse)
    )
)]
pub async fn user_login(
    axum::Extension(pool): axum::Extension<sqlx::PgPool>,
    axum::Json(payload): axum::Json<request::LoginRequest>,
) -> (axum::http::StatusCode, axum::Json<response::LoginResponse>) {
    if payload.username.is_empty() || payload.password.is_empty() {
        let reason = if payload.username.is_empty() {
            String::from("Username not provided")
        } else {
            String::from("Password not provided")
        };

        (
            axum::http::StatusCode::BAD_REQUEST,
            axum::Json(response::LoginResponse {
                message: reason,
                data: Vec::new(),
            }),
        )
    } else {
        match repo::user::exists(&pool, &payload.username).await {
            Ok(exists) => {
                if !exists {
                    println!("User does not exists");
                    (
                        axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                        axum::Json(response::LoginResponse {
                            message: String::from("Unable to login"),
                            data: Vec::new(),
                        }),
                    )
                } else {
                    let user = match repo::user::get(&pool, &payload.username).await {
                        Ok(user) => user,
                        Err(_err) => {
                            return (
                                axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                                axum::Json(response::LoginResponse {
                                    message: String::from("Unable to login"),
                                    data: Vec::new(),
                                }),
                            );
                        }
                    };
                    let hashed_password = user.password.clone();

                    match hashing::verify_password(&payload.password, hashed_password) {
                        Ok(matches) => {
                            if matches {
                                // Create token
                                let key = textsender_models::envy::environment::get_secret_key()
                                    .await
                                    .value;
                                let (token_literal, duration) =
                                    token_stuff::create_token(&key, &user.id).unwrap();

                                if token_stuff::verify_token(&key, &token_literal) {
                                    let current_time = time::OffsetDateTime::now_utc();
                                    let _ =
                                        repo::user::update_last_login(&pool, &user, &current_time)
                                            .await;

                                    (
                                        axum::http::StatusCode::OK,
                                        axum::Json(response::LoginResponse {
                                            message: String::from("Successful"),
                                            data: vec![textsender_models::token::LoginResult {
                                                user_id: user.id,
                                                access_token: token_literal,
                                                token_type: String::from(
                                                    textsender_models::token::TOKEN_TYPE,
                                                ),
                                                expires_in: duration,
                                                ..Default::default()
                                            }],
                                        }),
                                    )
                                } else {
                                    (
                                        axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                                        axum::Json(response::LoginResponse {
                                            message: String::from("Invalid attempt"),
                                            data: Vec::new(),
                                        }),
                                    )
                                }
                            } else {
                                (
                                    axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                                    axum::Json(response::LoginResponse {
                                        message: String::from("Invalid attempt"),
                                        data: Vec::new(),
                                    }),
                                )
                            }
                        }
                        Err(err) => (
                            axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                            axum::Json(response::LoginResponse {
                                message: err.to_string(),
                                data: Vec::new(),
                            }),
                        ),
                    }
                }
            }
            Err(err) => (
                axum::http::StatusCode::INTERNAL_SERVER_ERROR,
                axum::Json(response::LoginResponse {
                    message: err.to_string(),
                    data: Vec::new(),
                }),
            ),
        }
    }
}