use crate::{
    key, client_management, config, schema::{self, RealmID}, server, token, user_management, UIDCError, group_management, token_management,
};
use clap::{Parser, Subcommand};
use microrm::prelude::*;

#[derive(Debug, Parser)]
#[clap(author, version, about, long_about = None)]
struct RootArgs {
    #[clap(short, long, default_value_t = String::from("uidc.db"))]
    /// Database path
    db: String,

    #[clap(short, long, default_value_t = String::from("primary"))]
    /// Which realm to use, for non-server only
    realm: String,

    #[clap(subcommand)]
    command: Command,
}

#[derive(Debug, Subcommand)]
enum Command {
    /// database initialization
    Init,
    /// OAuth2 client management
    Client(ClientArgs),
    /// general configuration
    Config(ConfigArgs),
    /// permissions grouping management
    Group(GroupArgs),
    /// key management
    Key(KeyArgs),
    /// run the actual OIDC server
    Server(ServerArgs),
    /// manual token generation and inspection
    Token(TokenArgs),
    /// role management
    Role(RoleArgs),
    /// user management
    User(UserArgs),
}

struct RunArgs {
    db: microrm::DB,
    realm_id: RealmID,
}

impl RootArgs {
    async fn run(&self) -> Result<(), UIDCError> {
        if let Command::Init = self.command {
            return self.init().await;
        }

        let db = microrm::DB::new(schema::schema(), &self.db, microrm::CreateMode::MustExist).map_err(|_| UIDCError::Abort("Error accessing database"))?;

        let realm_id = db.query_interface().get().by(schema::Realm::Shortname, self.realm.as_str()).one()?.ok_or(UIDCError::Abort("no such realm"))?.id();

        let ra = RunArgs { db: db, realm_id };

        match &self.command {
            Command::Init => unreachable!(),
            Command::Config(v) => v.run(ra).await,
            Command::Client(v) => v.run(ra).await,
            Command::Group(v) => v.run(ra).await,
            Command::Key(v) => v.run(ra).await,
            Command::Server(v) => v.run(ra).await,
            Command::Token(v) => v.run(ra).await,
            Command::Role(v) => v.run(ra).await,
            Command::User(v) => v.run(ra).await,
        }
    }

    async fn init(&self) -> Result<(), UIDCError> {
        // first check to see if the database is already vaguely set up
        let maybedb = microrm::DB::new(schema::schema(), &self.db, microrm::CreateMode::MustExist);

        if maybedb.is_ok() {
            return Err(UIDCError::Abort("Database already initialized, not overwriting!"));
        }

        log::info!("Initializing!");

        let db = microrm::DB::new(
            schema::schema(),
            &self.db,
            microrm::CreateMode::AllowNewDatabase,
        )
        .expect("Unable to initialize database!");

        // create primary realm
        db.query_interface()
            .add(&schema::Realm {
                shortname: "primary".to_string(),
            })?;
        Ok(())
    }
}

#[derive(Debug, Subcommand)]
enum KeyCommand {
    Inspect,
    Generate,
}

#[derive(Debug, Parser)]
struct KeyArgs {
    #[clap(subcommand)]
    command: KeyCommand,
}

impl KeyArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        match &self.command {
            KeyCommand::Inspect => {
                key::inspect(&args.db, args.realm_id)
            }
            KeyCommand::Generate => {
                key::generate(&args.db, args.realm_id)
            }
        }
    }
}

#[derive(Debug, Subcommand)]
enum ClientCommand {
    Create { name: String },
    List,
    Inspect { name: String },
}

#[derive(Debug, Parser)]
struct ClientArgs {
    #[clap(subcommand)]
    command: ClientCommand,
}

impl ClientArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        match &self.command {
            ClientCommand::Create { name } => {
                client_management::create(&args.db, args.realm_id, name)
            }
            ClientCommand::List => { todo!() }
            ClientCommand::Inspect { name } => {
                client_management::inspect(&args.db, args.realm_id, name)
            }
        }
    }
}

#[derive(Debug, Subcommand)]
enum ConfigCommand {
    Dump,
    Load { toml_path: String },
    Set { key: String, value: String },
}

#[derive(Debug, Parser)]
struct ConfigArgs {
    #[clap(subcommand)]
    command: ConfigCommand,
}

impl ConfigArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let qi = args.db.query_interface();

        match &self.command {
            ConfigCommand::Dump => {
                let config = config::Config::build_from(&qi, None);
                println!("config: {:?}", config);
            }
            ConfigCommand::Set { key, value } => {
                todo!()
            }
            ConfigCommand::Load { toml_path } => {
                let config = config::Config::build_from(&qi, Some(toml_path));
                config.save(&qi);
            }
        }
        Ok(())
    }
}

#[derive(Debug, Subcommand)]
enum GroupCommand {
    Create { group_name: String },
    Members { group_name: String },
    AttachRole { group_name: String, role_name: String },
    DetachRole { group_name: String, role_name: String },
    AttachUser { group_name: String, username: String },
    DetachUser { group_name: String, username: String },
}

#[derive(Debug, Parser)]
struct GroupArgs {
    #[clap(subcommand)]
    command: GroupCommand,
}

impl GroupArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let qi = args.db.query_interface();
        match &self.command {
            GroupCommand::Create { group_name } => {
                group_management::create_group(&qi, args.realm_id, group_name)?;
            },
            GroupCommand::Members { group_name } => {
                group_management::list_members(&qi, args.realm_id, group_name.as_str())?;
            },
            GroupCommand::AttachRole { group_name, role_name } => {
                group_management::attach_role(&qi, args.realm_id, group_name.as_str(), role_name.as_str())?;
            },
            GroupCommand::DetachRole { group_name, role_name } => {
                group_management::detach_role(&qi, args.realm_id, group_name.as_str(), role_name.as_str())?;
            },
            GroupCommand::AttachUser { group_name, username } => {
                group_management::attach_user(&qi, args.realm_id, group_name.as_str(), username.as_str())?;
            },
            GroupCommand::DetachUser { group_name, username } => {
                group_management::detach_user(&qi, args.realm_id, group_name.as_str(), username.as_str())?;
            }
        }
        Ok(())
    }
}

#[derive(Debug, Parser)]
struct ServerArgs {
    #[clap(short, long)]
    port: Option<u16>,
}

impl ServerArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let config = config::Config::build_from(&args.db.query_interface(), None);
        server::run_server(args.db, config, self.port.unwrap_or(2114)).await
    }
}

#[derive(Debug, Subcommand)]
enum TokenCommand {
    GenerateAuth {
        #[clap(short, long)]
        client: String,
        #[clap(short, long)]
        username: String,
        #[clap(short, long)]
        scopes: String,
    },
    GenerateRefresh {
        #[clap(short, long)]
        client: String,
        #[clap(short, long)]
        username: String,
        #[clap(short, long)]
        scopes: String,
    },
    Inspect {
        token: String,
    },
}

#[derive(Debug, Parser)]
struct TokenArgs {
    #[clap(subcommand)]
    command: TokenCommand,
}

impl TokenArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let config = config::Config::build_from(&args.db.query_interface(), None);
        let qi = args.db.query_interface();
        match &self.command {
            TokenCommand::GenerateAuth {
                client,
                username,
                scopes,
            } => {
                let token = token_management::create_auth_token(&qi, &config, args.realm_id, client.as_str(), username.as_str(), scopes.as_str())?;
                println!("{}", token);
                Ok(())
            }
            TokenCommand::GenerateRefresh {
                client,
                username,
                scopes,
            } => { todo!() }
            TokenCommand::Inspect { token } => { todo!() }
        }
    }
}

#[derive(Debug, Subcommand)]
enum RoleCommand {
    List,
    Create { name: String },
    Delete { name: String },
}

#[derive(Debug, Parser)]
struct RoleArgs {
    #[clap(subcommand)]
    command: RoleCommand,
}

impl RoleArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let qi = args.db.query_interface();
        // let config = config::Config::build_from(&qi, None);
        match &self.command {
            RoleCommand::List => {
                todo!()
            },
            RoleCommand::Create { name } => {
                let add_result = qi.add(&schema::Role {
                    realm: args.realm_id,
                    shortname: name.clone()
                });

                match add_result {
                    Ok(_role_id) => {
                        println!("Added role {}", name);
                    }
                    Err(_) => {
                        println!("Failed to add role {}!", name);
                    },
                }
            },
            RoleCommand::Delete { name } => {
                qi.delete().by(schema::Role::Realm, &args.realm_id).by(schema::Role::Shortname, name.as_str()).exec().unwrap();
            },
        }
        Ok(())
    }
}

#[derive(Debug, Subcommand)]
enum UserCommand {
    List,
    Create {
        username: String
    },
    Auth {
        username: String,

        #[clap(short = 'p', long, parse(from_occurrences))]
        change_password: usize,
    },
    Inspect {
        username: String,
    }
}

#[derive(Debug, Parser)]
struct UserArgs {
    #[clap(subcommand)]
    command: UserCommand,
}

impl UserArgs {
    async fn run(&self, args: RunArgs) -> Result<(), UIDCError> {
        let qi = args.db.query_interface();
        match &self.command {
            UserCommand::List => user_management::list(&qi, args.realm_id),
            UserCommand::Create { username } => {
                user_management::create(&qi, args.realm_id, username.as_str())
            }
            UserCommand::Auth { username, change_password } => user_management::change_auth(
                &qi,
                args.realm_id,
                username.as_str(),
                *change_password > 0,
            ),
            UserCommand::Inspect { username } => user_management::inspect(&qi, args.realm_id, username.as_str()),
        }
    }
}

pub fn invoked() {
    let args = RootArgs::parse();

    match smol::block_on(args.run()) {
        Ok(_) => (),
        Err(e) => {
            log::error!("Error occured while running command: {}", e);
        }
    }
}