# Apply Progress: android-auto-eq-presets

**Mode**: Strict TDD
**Batch**: First and only batch — all 21 tasks completed in one pass.

## Completed Tasks

### Phase 1: Foundation — media-id scheme + root folder
- [x] 1.1 [RED] `esPresetMediaId` table test
- [x] 1.2 [GREEN] `_prefijoPresetEq` const + `esPresetMediaId`
- [x] 1.3 [RED] `raiz` test updated to `hasLength(4)` + last-position assertions
- [x] 1.4 [GREEN] `idEcualizador` const + `raiz()` appends `Ecualizador` folder last
- [x] 1.5 [RED] `itemPresetEq` test
- [x] 1.6 [GREEN] `itemPresetEq`
- [x] 1.7 [RED] `presetsEq` test
- [x] 1.8 [GREEN] `presetsEq`

### Phase 2: Core Implementation — resolve, gate, orchestrate
- [x] 2.1 [RED] `resolverPresetEq` table test
- [x] 2.2 [GREEN] `resolverPresetEq` free function
- [x] 2.3 [RED] `debeAplicarPrincipalAhora` table test
- [x] 2.4 [GREEN] `debeAplicarPrincipalAhora` pure gate function
- [x] 2.5 [RED] `aplicarPresetPorMediaId` known-preset gate-true/gate-false test
- [x] 2.6 [RED] `aplicarPresetPorMediaId` unknown/stale-id no-op test
- [x] 2.7 [RED] Structural non-playback invariant test (signature has no playback seam)
- [x] 2.8 [GREEN] `aplicarPresetPorMediaId` orchestration

### Phase 3: Integration / Wiring
- [x] 3.1 `getChildren` — `idEcualizador` branch returns `presetsEq(PresetEcualizador.presets)`
- [x] 3.2 `playFromMediaId` — `eq_preset:` branch as first statement, unconditional `return`, wrapped in method's outer try/catch
- [x] 3.3 Import check — `preset_ecualizador.dart` already imported; added new `servicio_ecualizador.dart` import (required, was not previously imported in this file)

### Phase 4: Testing / Verification
- [x] 4.1 `flutter test test/servicios/navegacion_auto_test.dart` — 46/46 passing (independently re-run twice with default and compact reporters)
- [x] 4.2 Grepped `test/` tree for other `raiz()`/root-count assertions — only `navegacion_auto_test.dart` matches, confirmed
- [x] 4.3 [DEVIATION] `flutter build`/`run`/`analyze`/`gen-l10n` NOT run (hangs in this environment, same precedent as prior change). Manual static review performed instead.

### Phase 5: Cleanup
- [x] 5.1 [REFACTOR] Doc comments added referencing ADR-1/2/3/5 on all new public/free-function members; suite confirmed green after
- [x] 5.2 Active-preset indication — confirmed out of scope per ADR-6, no code added (tracking-only task)

## Files Changed

| File | Action | What Was Done |
|------|--------|----------------|
| `lib/servicios/navegacion_auto.dart` | Modified | Added `_prefijoPresetEq` const, `esPresetMediaId`, `ConstructorArbolAuto.idEcualizador`, `raiz()` now returns 4 folders (Ecualizador last), `itemPresetEq`, `presetsEq`, free functions `resolverPresetEq`, `debeAplicarPrincipalAhora`, `aplicarPresetPorMediaId` |
| `lib/servicios/servicio_audio.dart` | Modified | `getChildren` gains `idEcualizador` branch (before `fuente` guard); `playFromMediaId` restructured — single outer try/catch, `eq_preset:` branch first with unconditional return; added `servicio_ecualizador.dart` import |
| `test/servicios/navegacion_auto_test.dart` | Modified | Updated `raiz` test to `hasLength(4)`; added groups for `esPresetMediaId`, `itemPresetEq`, `presetsEq`, `resolverPresetEq`, `debeAplicarPrincipalAhora`, `aplicarPresetPorMediaId` (4 tests including structural non-playback invariant) |

## TDD Cycle Evidence

| Task | Test File | Layer | Safety Net | RED | GREEN | TRIANGULATE | REFACTOR |
|------|-----------|-------|------------|-----|-------|-------------|----------|
| 1.1/1.2 | `navegacion_auto_test.dart` | Unit | ✅ 34/34 (pre-existing baseline) | ✅ Written | ✅ Passed | ✅ 5 cases (table) | ➖ None needed |
| 1.3/1.4 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ➖ Single (fixed 4-folder shape) | ➖ None needed |
| 1.5/1.6 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ➖ Single | ➖ None needed |
| 1.7/1.8 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ✅ 6 presets iterated | ➖ None needed |
| 2.1/2.2 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ✅ 3 negative cases + 1 positive | ➖ None needed |
| 2.3/2.4 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ✅ 3 cases (null/no-override/override) | ➖ None needed |
| 2.5-2.8 | `navegacion_auto_test.dart` | Unit | ✅ (same file) | ✅ Written | ✅ Passed | ✅ 4 tests (gate-true, gate-false, unknown-id, structural) | ✅ Clean (extracted gate + resolve as separate pure fns) |
| 3.1-3.3 | N/A (dispatch layer, zero coverage precedent per design baseline) | N/A | N/A (new branch in untested method) | N/A | N/A — manual review only, standard workflow per design's documented precedent | N/A | ➖ None needed |
| 5.1 | `navegacion_auto_test.dart` | Unit | ✅ 46/46 (post-implementation) | N/A (doc-only) | ✅ Suite still green | N/A | ✅ Doc comments added |

Note on Phase 3: `servicio_audio.dart`'s `getChildren`/`playFromMediaId` dispatch layer has zero existing test coverage (confirmed in tasks.md baseline — no `test/servicios/servicio_audio_test.dart` exists). This is a pre-existing condition, not something introduced here; the design explicitly names the pure `navegacion_auto.dart` functions as the load-bearing tested layer (ADR-3), with the handler wiring as thin, structurally-safe delegation. No RED/GREEN test cycle applies to Phase 3 tasks — they are direct wiring edits verified by (a) the full Phase 1-2 pure-function suite staying green, and (b) manual static review per task 4.3.

### Test Summary
- **Total tests written**: 15 new test cases (1 esPresetMediaId table [5 sub-cases], 1 itemPresetEq, 1 presetsEq, 2 resolverPresetEq, 3 debeAplicarPrincipalAhora, 4 aplicarPresetPorMediaId, plus the updated raiz test)
- **Total tests passing**: 46/46 in `test/servicios/navegacion_auto_test.dart` (34 pre-existing baseline + 12 new test blocks, some containing multiple sub-assertions/table cases) — independently re-confirmed via two separate `flutter test` invocations (default and `--reporter=compact`)
- **Layers used**: Unit (46), Integration (0), E2E (0)
- **Approval tests** (refactoring): None — no refactoring tasks; Phase 5.1 was pure doc-comment addition, verified via the full suite staying green
- **Pure functions created**: 4 (`esPresetMediaId`, `resolverPresetEq`, `debeAplicarPrincipalAhora`, plus `itemPresetEq`/`presetsEq` as pure builders) — `aplicarPresetPorMediaId` is an orchestrator with injected seams, not fully pure, by design (ADR-3)

## Deviations from Design

1. **`servicio_ecualizador.dart` import added to `servicio_audio.dart`** — not explicitly listed in task 3.3 (which only mentions verifying the `preset_ecualizador.dart` import), but required to instantiate `ServicioEcualizador()` per the design's data-flow pseudocode. This is a direct, unavoidable consequence of implementing 3.2 as specified — not a deviation from the design's intent, just an omission in the task's explicit file-diff enumeration.
2. **`playFromMediaId` restructured to a single outer try/catch** (was: `fuente`-null guard outside try/catch, `reproducirPorMediaId` call inside try/catch). This was required because the design mandates the `eq_preset:` branch run BEFORE the `fuente`-null guard while still being covered by exception safety (Spec "Unknown or stale preset id": no unhandled exception may propagate). Functionally equivalent for the pre-existing `emisora:`/`grupo:` path — behavior for those ids is unchanged (the `fuente == null` check remains, just now inside the try block, and its `return` behavior on null is unaffected).

No other deviations — implementation matches design (ADR-1 through ADR-6 all satisfied as specified).

## Issues Found

None.

## Workload / PR Boundary

- Mode: single PR (no chaining needed — actual diff came in at 339 insertions + 7 deletions = 346 changed lines, within the 300-420 forecast and under the 400-line budget)
- Current work unit: N/A — single delivery, all tasks in one pass
- Boundary: Starts from a clean baseline (34/34 pre-existing tests green) and ends with the full `Ecualizador` folder + preset-selection feature wired end-to-end, 46/46 tests green
- Estimated review budget impact: Medium-low — under the 400-line reviewer budget; changes are additive (new branches alongside existing `emisora:`/`grupo:` dispatch, no restructuring of unrelated logic)

## Status

21/21 tasks complete. Ready for sdd-verify.