use crate::data::entity_manager::EntityManager;
use crate::data::user::User;
use crate::utils::string_utils::apply_env_vars;
use serde_json::Value;
use std::collections::HashMap;

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize, Eq, PartialEq)]
pub struct ClientID(pub String);

pub type AdditionalClaims = HashMap<String, Value>;

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
pub struct Client {
    /// The ID of the client
    pub id: ClientID,

    /// The human-readable name of the client
    pub name: String,

    /// A short description of the service provided by the client
    pub description: String,

    /// The secret used by the client to retrieve authenticated users information
    /// This value is absent if implicit authentication flow is used
    pub secret: Option<String>,

    /// The URI where the users should be redirected once authenticated
    pub redirect_uri: String,

    /// Specify if the client must be allowed by default for new account
    #[serde(default = "bool::default")]
    pub default: bool,

    /// Specify whether a client is granted to all users
    #[serde(default = "bool::default")]
    pub granted_to_all_users: bool,

    /// Specify whether recent Second Factor Authentication is required to access this client
    #[serde(default = "bool::default")]
    pub enforce_2fa_auth: bool,

    /// Additional claims to return with the id token
    claims_id_token: Option<AdditionalClaims>,

    /// Additional claims to return through the user info endpoint
    claims_user_info: Option<AdditionalClaims>,
}

impl PartialEq for Client {
    fn eq(&self, other: &Self) -> bool {
        self.id.eq(&other.id)
    }
}

impl Eq for Client {}

impl Client {
    /// Check if the client has a secret defined
    pub fn has_secret(&self) -> bool {
        self.secret.is_some()
    }

    /// Process a single claim value
    fn process_claim_string(&self, user: &User, str: &str) -> String {
        str.replace("{username}", &user.username)
            .replace("{mail}", &user.email)
            .replace("{first_name}", &user.first_name)
            .replace("{last_name}", &user.last_name)
            .replace("{uid}", &user.uid.0)
    }

    /// Recurse claims processing
    fn recurse_claims_processing(&self, user: &User, value: &Value) -> Value {
        match value {
            Value::String(s) => Value::String(self.process_claim_string(user, s)),
            Value::Array(arr) => Value::Array(
                arr.iter()
                    .map(|v| self.recurse_claims_processing(user, v))
                    .collect(),
            ),
            Value::Object(obj) => obj
                .iter()
                .map(|(k, v)| {
                    (
                        self.process_claim_string(user, k),
                        self.recurse_claims_processing(user, v),
                    )
                })
                .collect(),
            v => v.clone(),
        }
    }

    /// Process additional claims, processing placeholders
    fn process_additional_claims(
        &self,
        user: &User,
        claims: &Option<AdditionalClaims>,
    ) -> Option<AdditionalClaims> {
        let claims = claims.as_ref()?;

        let res = claims
            .iter()
            .map(|(k, v)| {
                (
                    self.process_claim_string(user, k),
                    self.recurse_claims_processing(user, v),
                )
            })
            .collect();

        Some(res)
    }

    /// Get additional claims for id_token for a successful authentication
    pub fn claims_id_token(&self, user: &User) -> Option<AdditionalClaims> {
        self.process_additional_claims(user, &self.claims_id_token)
    }

    /// Get additional claims for user info for a successful authentication
    pub fn claims_user_info(&self, user: &User) -> Option<AdditionalClaims> {
        self.process_additional_claims(user, &self.claims_user_info)
    }
}

pub type ClientManager = EntityManager<Client>;

impl EntityManager<Client> {
    pub fn find_by_id(&self, u: &ClientID) -> Option<Client> {
        for entry in self.iter() {
            if entry.id.eq(u) {
                return Some(entry.clone());
            }
        }
        None
    }

    /// Get the list of default clients.
    ///
    /// i.e. the clients that are granted to new accounts by default
    pub fn get_default_clients(&self) -> Vec<&Client> {
        self.iter().filter(|u| u.default).collect()
    }

    pub fn apply_environment_variables(&mut self) {
        for c in self.iter_mut() {
            c.id = ClientID(apply_env_vars(&c.id.0));
            c.name = apply_env_vars(&c.name);
            c.description = apply_env_vars(&c.description);
            c.secret = c.secret.as_deref().map(apply_env_vars);
            c.redirect_uri = apply_env_vars(&c.redirect_uri);
        }
    }
}