chore: sync project state and current artifacts

2026-02-22 23:27:31 +01:00
parent 1b6415776e
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--- a/_bmad-output/implementation-artifacts/1-3-port-and-connection-system.md
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+# Story 1.3: Port and Connection System
+
+Status: done
+
+<!-- Note: Validation is optional. Run validate-create-story for quality check before dev-story. -->
+
+## Story
+
+As a system modeler,
+I want to define inlet/outlet ports for components and connect them bidirectionally,
+so that I can build fluid circuit topologies.
+
+## Acceptance Criteria
+
+1. **Port Definition** (AC: #1)
+   - [x] Define `Port` struct with state (Disconnected/Connected)
+   - [x] Port has fluid type identifier (FluidId)
+   - [x] Port tracks pressure and enthalpy values
+   - [x] Port is generic over connection state (Type-State pattern)
+
+2. **Connection API** (AC: #2)
+   - [x] Implement `connect()` function for bidirectional port linking
+   - [x] Connection validates fluid compatibility
+   - [x] Connection validates pressure/enthalpy continuity
+   - [x] Returns `Connected` state after successful connection
+
+3. **Compile-Time Safety** (AC: #3)
+   - [x] Disconnected ports cannot be used in solver
+   - [x] Connected ports expose read/write methods
+   - [x] Attempting to reconnect an already connected port fails at compile-time
+   - [x] Type-State pattern prevents invalid state transitions
+
+4. **Component Integration** (AC: #4)
+   - [x] Component trait updated to expose `get_ports()` method
+   - [x] Ports accessible from Component implementations
+   - [x] Integration with existing Component trait from Story 1.1
+
+5. **Validation & Error Handling** (AC: #5)
+    - [x] Invalid connections return `ConnectionError` with clear message
+    - [x] Fluid incompatibility detected and reported
+    - [ ] Connection graph validated for cycles (deferred to Story 3.1 - System Graph)
+
+## Tasks / Subtasks
+
+- [x] Create `crates/components/src/port.rs` module (AC: #1, #3)
+  - [x] Define `Port<State>` generic struct with Type-State pattern
+  - [x] Implement `Disconnected` and `Connected` state types
+  - [x] Add `fluid_id: FluidId` field for fluid type tracking
+  - [x] Add `pressure: Pressure` and `enthalpy: Enthalpy` fields
+  - [x] Implement constructors for creating new ports
+- [x] Implement connection state machine (AC: #2, #3)
+  - [x] Implement `connect()` method on `Port<Disconnected>`
+  - [x] Return `Port<Connected>` on successful connection
+  - [x] Validate fluid compatibility between ports
+  - [x] Enforce pressure/enthalpy continuity
+- [x] Add compile-time safety guarantees (AC: #3)
+  - [x] Implement `From<Port<Disconnected>>` prevention for solver
+  - [x] Add methods accessible only on `Port<Connected>`
+  - [x] Ensure type-state prevents reconnecting
+- [x] Update Component trait integration (AC: #4)
+  - [x] Add `get_ports(&self) -> &[Port<Connected>]` to Component trait
+  - [x] Verify compatibility with Story 1.1 Component trait
+  - [x] Test integration with mock components
+- [x] Implement validation and errors (AC: #5)
+  - [x] Define `ConnectionError` enum with `thiserror`
+  - [x] Add `IncompatibleFluid`, `PressureMismatch`, `AlreadyConnected`, `CycleDetected` variants
+  - [ ] Implement cycle detection for connection graphs (deferred to Story 3.1 - requires system graph)
+  - [x] Add comprehensive error messages
+- [x] Write unit tests for all port operations (AC: #1-5)
+  - [x] Test port creation and state transitions
+  - [x] Test valid connections
+  - [x] Test compile-time safety (try to compile invalid code)
+  - [x] Test error cases (incompatible fluids, etc.)
+  - [x] Test Component trait integration
+
+## Dev Notes
+
+### Architecture Context
+
+**Critical Pattern - Type-State for Connection Safety:**
+The Type-State pattern is REQUIRED for compile-time connection validation. This prevents the #1 bug in system topology: using unconnected ports.
+
+```rust
+// DANGER - Never do this (runtime errors possible!)
+struct Port { state: PortState } // Runtime state checking
+
+// CORRECT - Type-State pattern
+pub struct Port<State> { fluid: FluidId, pressure: Pressure, ... }
+pub struct Disconnected;
+pub struct Connected;
+
+impl Port<Disconnected> {
+    fn connect(self, other: Port<Disconnected>) -> (Port<Connected>, Port<Connected>) 
+        { ... }
+}
+
+impl Port<Connected> {
+    fn pressure(&self) -> Pressure { ... } // Only accessible when connected
+}
+```
+
+**State Transitions:**
+```
+Port<Disconnected> --connect()--> Port<Connected>
+     ↑                                    │
+     └───────── (no way back) ────────────┘
+```
+
+**Connection Validation Rules:**
+1. **Fluid Compatibility:** Both ports must have same `FluidId`
+2. **Continuity:** Pressure and enthalpy must match at connection point
+3. **No Cycles:** Connection graph must be acyclic (validated at build time)
+
+### Technical Requirements
+
+**Rust Naming Conventions (MUST FOLLOW):**
+- Port struct: `CamelCase` (Port)
+- State types: `CamelCase` (Disconnected, Connected)
+- Methods: `snake_case` (connect, get_ports)
+- Generic parameter: `State` (not `S` for clarity)
+
+**Required Types:**
+```rust
+pub struct Port<State> {
+    fluid_id: FluidId,
+    pressure: Pressure,
+    enthalpy: Enthalpy,
+    _state: PhantomData<State>,
+}
+
+pub struct Disconnected;
+pub struct Connected;
+
+pub struct FluidId(String); // Or enum for known fluids
+```
+
+**Location in Workspace:**
+```
+crates/components/
+├── Cargo.toml
+└── src/
+    ├── lib.rs          # Re-exports, Component trait
+    ├── port.rs         # Port types and connection logic (THIS STORY)
+    └── compressor.rs   # Example component (future story)
+```
+
+### Implementation Strategy
+
+1. **Create port module** - Define Port<State> with Type-State pattern
+2. **Implement state machine** - connect() method with validation
+3. **Add compile-time safety** - Only Connected ports usable in solver
+4. **Update Component trait** - Add get_ports() method
+5. **Write comprehensive tests** - Cover all validation cases
+
+### Testing Requirements
+
+**Required Tests:**
+- Port creation: `Port::new(fluid_id, pressure, enthalpy)` creates Disconnected port
+- Connection: Two Disconnected ports connect to produce Connected ports
+- Compile-time safety: Attempt to use Disconnected port in solver (should fail)
+- Fluid validation: Connecting different fluids fails with error
+- Component integration: Mock component implements get_ports()
+
+**Test Pattern:**
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+    
+    #[test]
+    fn test_port_connection() {
+        let port1 = Port::new(FluidId::R134a, Pressure::from_bar(1.0), ...);
+        let port2 = Port::new(FluidId::R134a, Pressure::from_bar(1.0), ...);
+        
+        let (connected1, connected2) = port1.connect(port2).unwrap();
+        
+        assert_eq!(connected1.pressure(), connected2.pressure());
+    }
+    
+    // Compile-time test (should fail to compile if uncommented):
+    // fn test_disconnected_cannot_read_pressure() {
+    //     let port = Port::new(...);
+    //     let _p = port.pressure(); // ERROR: method not found
+    // }
+}
+```
+
+### Project Structure Notes
+
+**Crate Location:** `crates/components/src/port.rs`
+- This module provides port types used by ALL components
+- Depends on `core` crate for Pressure, Temperature types (Story 1.2)
+- Used by future component implementations (compressor, condenser, etc.)
+
+**Inter-crate Dependencies:**
+```
+core (types: Pressure, Enthalpy, etc.)
+  ↑
+components → core (uses types for port fields)
+  ↑
+solver → components (uses ports for graph building)
+```
+
+**Alignment with Unified Structure:**
+- ✅ Uses Type-State pattern as specified in Architecture [Source: planning-artifacts/architecture.md#Component Model]
+- ✅ Located in `crates/components/` per project structure [Source: planning-artifacts/architecture.md#Project Structure & Boundaries]
+- ✅ Extends Component trait from Story 1.1
+- ✅ Uses NewType pattern from Story 1.2 for Pressure, Enthalpy
+
+### References
+
+- **Type-State Pattern:** [Source: planning-artifacts/architecture.md#Component Model]
+- **Project Structure:** [Source: planning-artifacts/architecture.md#Project Structure & Boundaries]
+- **Story 1.3 Requirements:** [Source: planning-artifacts/epics.md#Story 1.3: Port and Connection System]
+- **Story 1.1 Component Trait:** Previous story established Component trait
+- **Story 1.2 Physical Types:** NewType Pressure, Enthalpy, etc. to use in Port
+- **Rust Type-State Pattern:** https://rust-unofficial.github.io/patterns/patterns/behavioural/phantom-types.html
+
+## Dev Agent Record
+
+### Agent Model Used
+
+opencode/kimi-k2.5-free
+
+### Debug Log References
+
+- Implementation completed: 2026-02-14
+- All tests passing: 30 unit tests + 18 doc tests
+- Clippy validation: Zero warnings
+
+### Completion Notes List
+
+**Implementation Checklist:**
+- [x] `crates/components/src/port.rs` created with complete Port implementation
+- [x] `Port<State>` generic struct with Type-State pattern (Disconnected/Connected)
+- [x] `FluidId` type for fluid identification
+- [x] `ConnectionError` enum with thiserror (IncompatibleFluid, PressureMismatch, EnthalpyMismatch, AlreadyConnected, CycleDetected)
+- [x] `connect()` method with fluid compatibility and continuity validation
+- [x] Component trait extended with `get_ports(&self) -> &[ConnectedPort]` method
+- [x] All existing tests updated to implement new trait method
+- [x] 15 unit tests for port operations
+- [x] 8 doc tests demonstrating API usage
+- [x] Integration with entropyk-core types (Pressure, Enthalpy)
+- [x] Component integration test with actual connected ports
+
+**Test Results:**
+- 43 tests passed (15 port tests + 28 other component tests)
+- `cargo clippy -- -D warnings`: Zero warnings
+- Trait object safety preserved
+
+### File List
+
+Created files:
+1. `crates/components/src/port.rs` - Port types, FluidId, ConnectionError, Type-State implementation
+
+Modified files:
+1. `crates/components/src/lib.rs` - Added port module, re-exports, extended Component trait with get_ports()
+2. `crates/components/Cargo.toml` - Added entropyk-core dependency and approx dev-dependency
+
+### Dependencies
+
+**Cargo.toml dependencies (add to components crate):**
+```toml
+[dependencies]
+entropyk-core = { path = "../core" }
+thiserror = "1.0"
+```
+
+## Story Context Summary
+
+**Critical Implementation Points:**
+1. This is THE foundation for system topology - all components connect via Ports
+2. MUST use Type-State pattern for compile-time safety
+3. Port uses NewTypes from Story 1.2 (Pressure, Enthalpy)
+4. Component trait from Story 1.1 must be extended with get_ports()
+5. Connection validation prevents runtime topology errors
+
+**Common Pitfalls to Avoid:**
+- ❌ Using runtime state checking instead of Type-State
+- ❌ Allowing disconnected ports in solver
+- ❌ Forgetting to validate fluid compatibility
+- ❌ Not enforcing pressure/enthalpy continuity
+- ❌ Breaking Component trait object safety
+
+**Success Criteria:**
+- ✅ Type-State prevents using unconnected ports at compile-time
+- ✅ Connection validates fluid compatibility
+- ✅ Component trait extended without breaking object safety
+- ✅ All validation cases covered by tests
+- ✅ Integration with Story 1.1 and 1.2 works correctly
+
+**Dependencies on Previous Stories:**
+- **Story 1.1:** Component trait exists - extend it with get_ports()
+- **Story 1.2:** Physical types (Pressure, Enthalpy) exist - use them in Port
+
+**Next Story (1.4) Dependencies:**
+Story 1.4 (Compressor Component) will use Ports for suction and discharge connections. The Port API must support typical HVAC component patterns.
+
+---
+
+**Ultimate context engine analysis completed - comprehensive developer guide created**