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use super::{ffi, DataHandle, Entity, World};
use std::collections::HashMap;

/// Helper struct to get reflection data from the host.
pub struct WorldReflection {
    _id: DataHandle,

    strings: HashMap<ffi::DataHandle, String>,
    parameters: HashMap<ffi::DataHandle, Vec<ffi::ParameterMetaDataEntry>>,
    components: Vec<ffi::ComponentMetaDataEntry>,
}

impl WorldReflection {
    /// Creates a `WorldReflection`.
    pub fn create() -> Self {
        let data = World::create_data(ffi::CreateDataType::ComponentsMetaData, &[]);
        let mut strings = HashMap::new();
        let mut parameters_all = HashMap::new();

        let root = data.read::<ffi::ComponentsMetaDataEntry>();
        let components = DataHandle::from_ffi(root.components);
        let components = components.read_vec::<ffi::ComponentMetaDataEntry>();
        for c in &components {
            let parameters = DataHandle::from_ffi(c.parameters);
            let parameters = parameters.read_vec::<ffi::ParameterMetaDataEntry>();
            let c_name = DataHandle::from_ffi(c.name).read_str();
            let _ = strings.insert(c.name, c_name);

            for p in &parameters {
                let p_name = DataHandle::from_ffi(p.name).read_str();
                let _ = strings.insert(p.name, p_name);
            }

            let _ = parameters_all.insert(c.parameters, parameters);
        }

        Self {
            _id: data,
            strings,
            parameters: parameters_all,
            components,
        }
    }

    /// Get the world reflection singleton
    pub fn get() -> &'static Self {
        unsafe {
            static mut REFLECTION: Option<WorldReflection> = None;

            if REFLECTION.is_none() {
                REFLECTION = Some(Self::create());
            }
            REFLECTION.as_ref().unwrap()
        }
    }

    /// Gets the reflected components
    pub fn components(&self) -> &[ffi::ComponentMetaDataEntry] {
        &self.components
    }

    /// Gets the reflected components for a specific entity
    pub fn components_for_entity(&self, entity: Entity) -> Vec<ffi::ComponentMetaDataEntry> {
        let components = World::get_components_vec(entity);
        let mut ret_components = self.components.clone();
        ret_components.retain(|c| components.contains(&c.component_type));
        ret_components
    }

    /// Gets the reflected parameters
    pub fn parameters(&self, data: ffi::DataHandle) -> &[ffi::ParameterMetaDataEntry] {
        if let Some(parameters) = self.parameters.get(&data) {
            parameters
        } else {
            &[]
        }
    }

    /// Gets a string
    pub fn string(&self, data: ffi::DataHandle) -> &str {
        if let Some(string) = self.strings.get(&data) {
            string
        } else {
            ""
        }
    }

    /// Gets information about a specific parameter
    pub fn parameter(
        &self,
        component_type: ffi::ComponentType,
        parameter_id: u32,
    ) -> Option<&ffi::ParameterMetaDataEntry> {
        for component in self.components() {
            if component_type == component.component_type {
                for p in self.parameters(component.parameters) {
                    if p.parameter_id == parameter_id {
                        return Some(p);
                    }
                }
            }
        }

        None
    }
}