use rocket::{
    form::{Form, FromForm},
    get, post,
    request::FlashMessage,
    response::{Flash, Redirect},
    uri,
};
use rocket_dyn_templates::{tera::Context, Template};

use peach_lib::config_manager;

use crate::error::PeachWebError;
use crate::routes::authentication::Authenticated;
use crate::utils;

// HELPERS AND ROUTES FOR /settings/admin

/// Administrator settings menu.
#[get("/")]
pub fn admin_menu(flash: Option<FlashMessage>, _auth: Authenticated) -> Template {
    // retrieve current ui theme
    let theme = utils::get_theme();

    let mut context = Context::new();
    context.insert("theme", &theme);
    context.insert("back", &Some("/settings".to_string()));
    context.insert("title", &Some("Administrator Settings".to_string()));

    // check to see if there is a flash message to display
    if let Some(flash) = flash {
        context.insert("flash_name", &Some(flash.kind().to_string()));
        context.insert("flash_msg", &Some(flash.message().to_string()));
    };

    Template::render("settings/admin/menu", &context.into_json())
}

// HELPERS AND ROUTES FOR /settings/admin/configure

/// View and delete currently configured admin.
#[get("/configure")]
pub fn configure_admin(flash: Option<FlashMessage>, _auth: Authenticated) -> Template {
    // retrieve current ui theme
    let theme = utils::get_theme();

    let mut context = Context::new();
    context.insert("theme", &theme);
    context.insert("back", &Some("/settings/admin".to_string()));
    context.insert("title", &Some("Configure Admin".to_string()));

    // check to see if there is a flash message to display
    if let Some(flash) = flash {
        context.insert("flash_name", &Some(flash.kind().to_string()));
        context.insert("flash_msg", &Some(flash.message().to_string()));
    };

    // load the peach configuration vector
    match config_manager::load_peach_config() {
        Ok(config) => {
            // retrieve the vector of ssb admin ids
            let ssb_admin_ids = config.ssb_admin_ids;
            context.insert("ssb_admin_ids", &ssb_admin_ids);
        }
        // if load fails, overwrite the flash_name and flash_msg
        Err(e) => {
            context.insert("flash_name", &Some("error".to_string()));
            context.insert(
                "flash_msg",
                &Some(format!("Failed to load Peach config: {}", e)),
            );
        }
    }

    Template::render("settings/admin/configure_admin", &context.into_json())
}

// HELPERS AND ROUTES FOR /settings/admin/add

#[derive(Debug, FromForm)]
pub struct AddAdminForm {
    pub ssb_id: String,
}

pub fn save_add_admin_form(admin_form: AddAdminForm) -> Result<(), PeachWebError> {
    let _result = config_manager::add_ssb_admin_id(&admin_form.ssb_id)?;

    // if the previous line didn't throw an error then it was a success
    Ok(())
}

#[post("/add", data = "<add_admin_form>")]
pub fn add_admin_post(add_admin_form: Form<AddAdminForm>, _auth: Authenticated) -> Flash<Redirect> {
    let result = save_add_admin_form(add_admin_form.into_inner());
    let url = uri!("/settings/admin/configure");
    match result {
        Ok(_) => Flash::success(Redirect::to(url), "Added SSB administrator"),
        Err(e) => Flash::error(Redirect::to(url), format!("Failed to add new admin: {}", e)),
    }
}

// HELPERS AND ROUTES FOR /settings/admin/delete

#[derive(Debug, FromForm)]
pub struct DeleteAdminForm {
    pub ssb_id: String,
}

#[post("/delete", data = "<delete_admin_form>")]
pub fn delete_admin_post(
    delete_admin_form: Form<DeleteAdminForm>,
    _auth: Authenticated,
) -> Flash<Redirect> {
    let result = config_manager::delete_ssb_admin_id(&delete_admin_form.ssb_id);
    let url = uri!("/settings/admin", configure_admin);
    match result {
        Ok(_) => Flash::success(Redirect::to(url), "Removed SSB administrator"),
        Err(e) => Flash::error(
            Redirect::to(url),
            format!("Failed to remove admin id: {}", e),
        ),
    }
}