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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use super::{
    elem_type::ImmOrPNode,
    interface::{IBoolean, INode, ISelector},
    ivalue::IValue,
    node_base::{NodeAttributeBase, NodeBase, NodeElementBase},
    store::{CacheStore, IntegerId, NodeId, NodeStore, ValueStore},
    Device, GenApiError, GenApiResult, ValueCtxt,
};

#[derive(Debug, Clone)]
pub struct BooleanNode {
    pub(crate) attr_base: NodeAttributeBase,
    pub(crate) elem_base: NodeElementBase,

    pub(crate) streamable: bool,
    pub(crate) value: ImmOrPNode<IntegerId>,
    pub(crate) on_value: i64,
    pub(crate) off_value: i64,
    pub(crate) p_selected: Vec<NodeId>,
}

impl BooleanNode {
    #[must_use]
    pub fn value_elem(&self) -> ImmOrPNode<IntegerId> {
        self.value
    }

    #[must_use]
    pub fn on_value(&self) -> i64 {
        self.on_value
    }

    #[must_use]
    pub fn off_value(&self) -> i64 {
        self.off_value
    }

    #[must_use]
    pub fn p_selected(&self) -> &[NodeId] {
        &self.p_selected
    }
}

impl INode for BooleanNode {
    fn node_base(&self) -> NodeBase {
        NodeBase::new(&self.attr_base, &self.elem_base)
    }

    fn streamable(&self) -> bool {
        self.streamable
    }
}

impl IBoolean for BooleanNode {
    #[tracing::instrument(skip(self, device, store, cx),
                          level = "trace",
                          fields(node = store.name_by_id(self.node_base().id()).unwrap()))]
    fn value<T: ValueStore, U: CacheStore>(
        &self,
        device: &mut impl Device,
        store: &impl NodeStore,
        cx: &mut ValueCtxt<T, U>,
    ) -> GenApiResult<bool> {
        let value = self.value.value(device, store, cx)?;
        if value == self.on_value {
            Ok(true)
        } else if value == self.off_value {
            Ok(false)
        } else {
            Err(GenApiError::invalid_node(
                "the internal integer value cannot be interpreted as boolean".into(),
            ))
        }
    }

    #[tracing::instrument(skip(self, device, store, cx),
                          level = "trace",
                          fields(node = store.name_by_id(self.node_base().id()).unwrap()))]
    fn set_value<T: ValueStore, U: CacheStore>(
        &self,
        value: bool,
        device: &mut impl Device,
        store: &impl NodeStore,
        cx: &mut ValueCtxt<T, U>,
    ) -> GenApiResult<()> {
        cx.invalidate_cache_by(self.node_base().id());
        let value = if value { self.on_value } else { self.off_value };
        self.value.set_value(value, device, store, cx)
    }

    #[tracing::instrument(skip(self, device, store, cx),
                          level = "trace",
                          fields(node = store.name_by_id(self.node_base().id()).unwrap()))]
    fn is_readable<T: ValueStore, U: CacheStore>(
        &self,
        device: &mut impl Device,
        store: &impl NodeStore,
        cx: &mut ValueCtxt<T, U>,
    ) -> GenApiResult<bool> {
        Ok(self.elem_base.is_readable(device, store, cx)?
            && self.value.is_readable(device, store, cx)?)
    }

    #[tracing::instrument(skip(self, device, store, cx),
                          level = "trace",
                          fields(node = store.name_by_id(self.node_base().id()).unwrap()))]
    fn is_writable<T: ValueStore, U: CacheStore>(
        &self,
        device: &mut impl Device,
        store: &impl NodeStore,
        cx: &mut ValueCtxt<T, U>,
    ) -> GenApiResult<bool> {
        Ok(self.elem_base.is_writable(device, store, cx)?
            && self.value.is_writable(device, store, cx)?)
    }
}

impl ISelector for BooleanNode {
    fn selecting_nodes(&self, _store: &impl NodeStore) -> GenApiResult<&[NodeId]> {
        Ok(self.p_selected())
    }
}