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use crate::core::now;
use crate::utils::Pausable;
use crate::{
    use_interval_fn_with_options, use_raf_fn_with_options, UseIntervalFnOptions, UseRafFnOptions,
};
use default_struct_builder::DefaultBuilder;
use leptos::*;
use std::rc::Rc;

/// Reactive current timestamp.
///
/// ## Demo
///
/// [Link to Demo](https://github.com/Synphonyte/leptos-use/tree/main/examples/use_timestamp)
///
/// ## Usage
///
/// ```
/// # use leptos::*;
/// # use leptos_use::use_timestamp;
/// #
/// # #[component]
/// # fn Demo() -> impl IntoView {
/// let timestamp = use_timestamp();
/// #
/// # view! { }
/// # }
/// ```
///
/// With controls:
///
/// ```
/// # use leptos::*;
/// # use leptos_use::{use_timestamp_with_controls, UseTimestampReturn};
/// #
/// # #[component]
/// # fn Demo() -> impl IntoView {
/// let UseTimestampReturn {
///     timestamp,
///     is_active,
///     pause,
///     resume,
/// } = use_timestamp_with_controls();
/// #
/// # view! { }
/// # }
/// ```
///
/// ## Server-Side Rendering
///
/// On the server this function will return a signal with the milliseconds since the Unix epoch.
/// But the signal will never update (as there's no `request_animation_frame` on the server).
pub fn use_timestamp() -> Signal<f64> {
    use_timestamp_with_controls().timestamp
}

/// Version of [`use_timestamp`] that takes a `UseTimestampOptions`. See [`use_timestamp`] for how to use.
pub fn use_timestamp_with_options(options: UseTimestampOptions) -> Signal<f64> {
    use_timestamp_with_controls_and_options(options).timestamp
}

/// Version of [`use_timestamp`] that returns controls. See [`use_timestamp`] for how to use.
pub fn use_timestamp_with_controls() -> UseTimestampReturn {
    use_timestamp_with_controls_and_options(UseTimestampOptions::default())
}

/// Version of [`use_timestamp`] that takes a `UseTimestampOptions` and returns controls. See [`use_timestamp`] for how to use.
pub fn use_timestamp_with_controls_and_options(options: UseTimestampOptions) -> UseTimestampReturn {
    let UseTimestampOptions {
        offset,
        immediate,
        interval,
        callback,
    } = options;

    let (ts, set_ts) = create_signal(now() + offset);

    let update = move || {
        set_ts.set(now() + offset);
    };

    let cb = {
        let callback = Rc::clone(&callback);

        move || {
            update();

            #[cfg(debug_assertions)]
            let prev = SpecialNonReactiveZone::enter();

            callback(ts.get_untracked());

            #[cfg(debug_assertions)]
            SpecialNonReactiveZone::exit(prev);
        }
    };

    match interval {
        TimestampInterval::RequestAnimationFrame => {
            let Pausable {
                pause,
                resume,
                is_active,
            } = use_raf_fn_with_options(
                move |_| cb(),
                UseRafFnOptions::default().immediate(immediate),
            );

            UseTimestampReturn {
                timestamp: ts.into(),
                is_active,
                pause: Rc::new(pause),
                resume: Rc::new(resume),
            }
        }

        TimestampInterval::Interval(interval) => {
            let Pausable {
                pause,
                resume,
                is_active,
            } = use_interval_fn_with_options(
                cb,
                interval,
                UseIntervalFnOptions::default().immediate(immediate),
            );

            UseTimestampReturn {
                timestamp: ts.into(),
                is_active,
                pause: Rc::new(pause),
                resume: Rc::new(resume),
            }
        }
    }
}

/// Options for [`use_timestamp_with_controls_and_options`].
#[derive(DefaultBuilder)]
pub struct UseTimestampOptions {
    /// Offset value in milliseconds that is added to the returned timestamp. Defaults to `0.0`.
    offset: f64,

    /// Whether to update the timestamp immediately. Defaults to `true`.
    immediate: bool,

    /// Update interval in milliseconds or `RequestAnimationFrame`. Defaults to `RequestAnimationFrame`.
    #[builder(into)]
    interval: TimestampInterval,

    /// Callback to be called whenever the timestamp is updated.
    callback: Rc<dyn Fn(f64)>,
}

/// Interval type for [`UseTimestampOptions`].
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum TimestampInterval {
    /// use [`use_raf_fn`] for updating the timestamp
    RequestAnimationFrame,

    /// use [`use_interval_fn`] for updating the timestamp
    Interval(u64),
}

impl From<u64> for TimestampInterval {
    fn from(value: u64) -> Self {
        Self::Interval(value)
    }
}

impl Default for UseTimestampOptions {
    fn default() -> Self {
        Self {
            offset: 0.0,
            immediate: true,
            interval: TimestampInterval::RequestAnimationFrame,
            callback: Rc::new(|_| {}),
        }
    }
}

/// Return type of [`use_timestamp_with_controls`].
pub struct UseTimestampReturn {
    /// The current timestamp
    pub timestamp: Signal<f64>,

    /// A Signal that indicates whether the timestamp updating is active. `false` when paused.
    pub is_active: Signal<bool>,

    /// Temporarily pause the timestamp from updating
    pub pause: Rc<dyn Fn()>,

    /// Resume the timestamp updating
    pub resume: Rc<dyn Fn()>,
}