icydb-schema 0.93.2

use crate::node::{validate_memory_id_in_range, validate_memory_id_not_reserved};
use crate::prelude::*;
use std::collections::BTreeMap;

//
// Canister
//

#[derive(CandidType, Clone, Debug, Serialize)]
pub struct Canister {
    def: Def,
    memory_min: u8,
    memory_max: u8,
    pub commit_memory_id: u8,
}

impl Canister {
    #[must_use]
    pub const fn new(def: Def, memory_min: u8, memory_max: u8, commit_memory_id: u8) -> Self {
        Self {
            def,
            memory_min,
            memory_max,
            commit_memory_id,
        }
    }

    #[must_use]
    pub const fn def(&self) -> &Def {
        &self.def
    }

    #[must_use]
    pub const fn memory_min(&self) -> u8 {
        self.memory_min
    }

    #[must_use]
    pub const fn memory_max(&self) -> u8 {
        self.memory_max
    }

    #[must_use]
    pub const fn commit_memory_id(&self) -> u8 {
        self.commit_memory_id
    }
}

impl MacroNode for Canister {
    fn as_any(&self) -> &dyn std::any::Any {
        self
    }
}

impl ValidateNode for Canister {
    fn validate(&self) -> Result<(), ErrorTree> {
        let mut errs = ErrorTree::new();
        let schema = schema_read();

        let canister_path = self.def().path();
        let mut seen_ids = BTreeMap::<u8, String>::new();

        validate_memory_id_in_range(
            &mut errs,
            "commit_memory_id",
            self.commit_memory_id(),
            self.memory_min(),
            self.memory_max(),
        );
        validate_memory_id_not_reserved(&mut errs, "commit_memory_id", self.commit_memory_id());

        assert_unique_memory_id(
            self.commit_memory_id(),
            format!("Canister `{}`.commit_memory_id", self.def().path()),
            &canister_path,
            &mut seen_ids,
            &mut errs,
        );

        // Check all Store nodes for this canister
        for (path, store) in schema.filter_nodes::<Store>(|node| node.canister() == canister_path) {
            assert_unique_memory_id(
                store.data_memory_id(),
                format!("Store `{path}`.data_memory_id"),
                &canister_path,
                &mut seen_ids,
                &mut errs,
            );

            assert_unique_memory_id(
                store.index_memory_id(),
                format!("Store `{path}`.index_memory_id"),
                &canister_path,
                &mut seen_ids,
                &mut errs,
            );
        }

        errs.result()
    }
}

fn assert_unique_memory_id(
    memory_id: u8,
    slot: String,
    canister_path: &str,
    seen_ids: &mut BTreeMap<u8, String>,
    errs: &mut ErrorTree,
) {
    if let Some(existing) = seen_ids.get(&memory_id) {
        err!(
            errs,
            "duplicate memory_id `{}` used in canister `{}`: {} conflicts with {}",
            memory_id,
            canister_path,
            existing,
            slot
        );
    } else {
        seen_ids.insert(memory_id, slot);
    }
}

impl VisitableNode for Canister {
    fn route_key(&self) -> String {
        self.def().path()
    }
}

//
// TESTS
//

#[cfg(test)]
mod tests {
    use crate::build::schema_write;

    use super::*;

    fn insert_canister(path_module: &'static str, ident: &'static str) -> Canister {
        let canister = Canister::new(Def::new(path_module, ident), 0, 255, 254);
        schema_write().insert_node(SchemaNode::Canister(canister.clone()));

        canister
    }

    fn insert_store(
        path_module: &'static str,
        ident: &'static str,
        canister_path: &'static str,
        data_memory_id: u8,
        index_memory_id: u8,
    ) {
        schema_write().insert_node(SchemaNode::Store(Store::new(
            Def::new(path_module, ident),
            ident,
            canister_path,
            data_memory_id,
            index_memory_id,
        )));
    }

    #[test]
    fn validate_rejects_memory_id_collision_between_stores() {
        let canister = insert_canister("schema_store_collision", "Canister");
        let canister_path = "schema_store_collision::Canister";

        insert_store("schema_store_collision", "StoreA", canister_path, 10, 11);
        insert_store("schema_store_collision", "StoreB", canister_path, 12, 10); // collision

        let err = canister
            .validate()
            .expect_err("memory-id collision must fail");

        let rendered = err.to_string();
        assert!(
            rendered.contains("duplicate memory_id `10`"),
            "expected duplicate memory-id error, got: {rendered}"
        );
    }

    #[test]
    fn validate_accepts_unique_memory_ids() {
        let canister = insert_canister("schema_store_unique", "Canister");
        let canister_path = "schema_store_unique::Canister";

        insert_store("schema_store_unique", "StoreA", canister_path, 30, 31);
        insert_store("schema_store_unique", "StoreB", canister_path, 32, 33);

        canister.validate().expect("unique memory IDs should pass");
    }

    #[test]
    fn validate_rejects_reserved_commit_memory_id() {
        let canister = Canister::new(Def::new("schema_reserved_commit", "Canister"), 0, 255, 255);
        schema_write().insert_node(SchemaNode::Canister(canister.clone()));

        let err = canister
            .validate()
            .expect_err("reserved commit memory id must fail");

        let rendered = err.to_string();
        assert!(
            rendered.contains("reserved for stable-structures internals"),
            "expected reserved-id error, got: {rendered}"
        );
    }
}