use clap::Parser;
use s3::creds::Credentials;
use s3::{Bucket, Region};

/// GeneIT backend API
#[derive(Parser, Debug, Clone)]
#[clap(author, version, about, long_about = None)]
pub struct AppConfig {
    /// Listen address
    #[clap(short, long, env, default_value = "0.0.0.0:8000")]
    pub listen_address: String,

    /// Website origin
    #[clap(short, long, env, default_value = "http://localhost:3000")]
    pub website_origin: String,

    /// Proxy IP, might end with a star "*"
    #[clap(short, long, env)]
    pub proxy_ip: Option<String>,

    /// PostgreSQL database host
    #[clap(long, env, default_value = "localhost")]
    db_host: String,

    /// PostgreSQL database port
    #[clap(long, env, default_value_t = 5432)]
    db_port: u16,

    /// PostgreSQL username
    #[clap(long, env, default_value = "user")]
    db_username: String,

    /// PostgreSQL password
    #[clap(long, env, default_value = "pass")]
    db_password: String,

    /// PostgreSQL database name
    #[clap(long, env, default_value = "geneit")]
    db_name: String,

    /// Redis connection hostname
    #[clap(long, env, default_value = "localhost")]
    redis_hostname: String,

    /// Redis connection port
    #[clap(long, env, default_value_t = 6379)]
    redis_port: u16,

    /// Redis database number
    #[clap(long, env, default_value_t = 0)]
    redis_db_number: i64,

    /// Redis username
    #[clap(long, env)]
    redis_username: Option<String>,

    /// Redis password
    #[clap(long, env, default_value = "secretredis")]
    redis_password: String,

    /// Mail sender
    #[clap(long, env, default_value = "geneit@example.com")]
    pub mail_sender: String,

    /// SMTP relay
    #[clap(long, env, default_value = "localhost")]
    pub smtp_relay: String,

    /// SMTP port
    #[clap(long, env, default_value_t = 1025)]
    pub smtp_port: u16,

    /// SMTP use TLS to connect to relay
    #[clap(long, env)]
    pub smtp_tls: bool,

    /// SMTP username
    #[clap(long, env)]
    pub smtp_username: Option<String>,

    /// SMTP password
    #[clap(long, env)]
    pub smtp_password: Option<String>,

    /// Password reset URL
    #[clap(long, env, default_value = "APP_ORIGIN/reset_password#TOKEN")]
    pub reset_password_url: String,

    /// Delete account URL
    #[clap(long, env, default_value = "APP_ORIGIN/delete_account#TOKEN")]
    pub delete_account_url: String,

    /// URL where the OpenID configuration can be found
    #[arg(
        long,
        env,
        default_value = "http://localhost:9001/.well-known/openid-configuration"
    )]
    pub oidc_configuration_url: String,

    /// Disable OpenID authentication
    #[arg(long, env)]
    pub disable_oidc: bool,

    /// OpenID provider name
    #[arg(long, env, default_value = "3rd party provider")]
    pub oidc_provider_name: String,

    /// OpenID client ID
    #[arg(long, env, default_value = "foo")]
    pub oidc_client_id: String,

    /// OpenID client secret
    #[arg(long, env, default_value = "bar")]
    pub oidc_client_secret: String,

    /// OpenID login redirect URL
    #[arg(long, env, default_value = "APP_ORIGIN/oidc_cb")]
    oidc_redirect_url: String,

    /// S3 Bucket name
    #[arg(long, env, default_value = "geneit-data")]
    s3_bucket_name: String,

    /// S3 region (if not using Minio)
    #[arg(long, env, default_value = "eu-central-1")]
    s3_region: String,

    /// S3 API endpoint
    #[arg(long, env, default_value = "http://localhost:9000")]
    s3_endpoint: String,

    /// S3 access key
    #[arg(long, env, default_value = "topsecret")]
    s3_access_key: String,

    /// S3 secret key
    #[arg(long, env, default_value = "topsecret")]
    s3_secret_key: String,

    /// S3 skip auto create bucket if not existing
    #[arg(long, env)]
    pub s3_skip_auto_create_bucket: bool,
}

lazy_static::lazy_static! {
    static ref ARGS: AppConfig = {
        AppConfig::parse()
    };
}

impl AppConfig {
    /// Get parsed command line arguments
    pub fn get() -> &'static AppConfig {
        &ARGS
    }

    /// Get full db connection chain
    pub fn db_connection_chain(&self) -> String {
        format!(
            "postgres://{}:{}@{}:{}/{}",
            self.db_username, self.db_password, self.db_host, self.db_port, self.db_name
        )
    }

    /// Get Redis connection configuration
    pub fn redis_connection_config(&self) -> redis::ConnectionInfo {
        redis::ConnectionInfo {
            addr: redis::ConnectionAddr::Tcp(self.redis_hostname.clone(), self.redis_port),
            redis: redis::RedisConnectionInfo {
                db: self.redis_db_number,
                username: self.redis_username.clone(),
                password: Some(self.redis_password.clone()),
            },
        }
    }

    /// Get password reset URL
    pub fn get_password_reset_url(&self, token: &str) -> String {
        self.reset_password_url
            .replace("APP_ORIGIN", &self.website_origin)
            .replace("TOKEN", token)
    }

    /// Get account delete URL
    pub fn get_account_delete_url(&self, token: &str) -> String {
        self.delete_account_url
            .replace("APP_ORIGIN", &self.website_origin)
            .replace("TOKEN", token)
    }

    /// Get OpenID providers configuration
    pub fn openid_providers(&self) -> Vec<OIDCProvider<'_>> {
        if self.disable_oidc {
            return vec![];
        }

        vec![OIDCProvider {
            id: "first_prov",
            client_id: self.oidc_client_id.as_str(),
            client_secret: self.oidc_client_secret.as_str(),
            configuration_url: self.oidc_configuration_url.as_str(),
            name: self.oidc_provider_name.as_str(),
        }]
    }

    /// Get OIDC callback URL
    pub fn oidc_redirect_url(&self) -> String {
        self.oidc_redirect_url
            .replace("APP_ORIGIN", &self.website_origin)
    }

    /// Get s3 credentials
    pub fn s3_credentials(&self) -> anyhow::Result<Credentials> {
        Ok(Credentials::new(
            Some(&self.s3_access_key),
            Some(&self.s3_secret_key),
            None,
            None,
            None,
        )?)
    }

    /// Get S3 bucket
    pub fn s3_bucket(&self) -> anyhow::Result<Bucket> {
        Ok(Bucket::new(
            &self.s3_bucket_name,
            Region::Custom {
                region: self.s3_region.to_string(),
                endpoint: self.s3_endpoint.to_string(),
            },
            self.s3_credentials()?,
        )?
        .with_path_style())
    }
}

#[derive(Debug, Clone, serde::Serialize)]
pub struct OIDCProvider<'a> {
    pub id: &'a str,
    #[serde(skip_serializing)]
    pub client_id: &'a str,
    #[serde(skip_serializing)]
    pub client_secret: &'a str,
    #[serde(skip_serializing)]
    pub configuration_url: &'a str,
    pub name: &'a str,
}