@phase2 @acms @depth_breadth_projection
Feature: Depth/Breadth Projection System and Skeleton Context Propagation
  As a CleverAgents developer
  I want a projection system over the UKO graph
  So that context can be materialized at varying detail levels
  based on distance from focal entities, and child plans can
  inherit compressed parent context via skeleton propagation

  # ---------------------------------------------------------------------------
  # ProjectionSpec model
  # ---------------------------------------------------------------------------

  @projection @model
  Scenario: ProjectionSpec is a frozen Pydantic model
    Given the depth/breadth projection modules are available
    When I create a ProjectionSpec with focus "class://AuthManager" and breadth 2 and depth 9
    Then the projection spec focus should contain "class://AuthManager"
    And the projection spec breadth should be 2
    And the projection spec depth should be 9
    And the projection spec depth_gradient should be True
    And the projection spec domain should be "uko-code:"
    And the projection spec should be immutable

  @projection @model
  Scenario: ProjectionSpec rejects empty focus
    Given the depth/breadth projection modules are available
    When I create a ProjectionSpec with empty focus
    Then a projection ValidationError should be raised

  @projection @model
  Scenario: ProjectionSpec rejects negative integer depth
    Given the depth/breadth projection modules are available
    When I create a ProjectionSpec with negative depth
    Then a projection ValueError should be raised mentioning "non-negative"

  @projection @model
  Scenario: ProjectionSpec accepts named depth levels
    Given the depth/breadth projection modules are available
    When I create a ProjectionSpec with focus "module://auth" and named depth "FULL_SOURCE"
    Then the projection spec depth should be "FULL_SOURCE"

  # ---------------------------------------------------------------------------
  # ProjectedNode model
  # ---------------------------------------------------------------------------

  @projection @model
  Scenario: ProjectedNode is a frozen Pydantic model
    Given the depth/breadth projection modules are available
    When I create a ProjectedNode with uri "class://Foo" and distance 1 and resolved_depth 4
    Then the projected node uri should be "class://Foo"
    And the projected node distance should be 1
    And the projected node resolved_depth should be 4
    And the projected node should be immutable

  # ---------------------------------------------------------------------------
  # DepthBreadthProjector — BFS traversal
  # ---------------------------------------------------------------------------

  @projection @projector
  Scenario: Projector performs BFS from focus with breadth 0
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C and edges A->B B->C
    When I project with focus "A" and breadth 0 and depth 9
    Then the projection should contain exactly 1 node
    And the projected nodes should include "A" at distance 0

  @projection @projector
  Scenario: Projector performs BFS from focus with breadth 1
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C and edges A->B B->C
    When I project with focus "A" and breadth 1 and depth 9
    Then the projection should contain exactly 2 nodes
    And the projected nodes should include "A" at distance 0
    And the projected nodes should include "B" at distance 1

  @projection @projector
  Scenario: Projector performs BFS from focus with breadth 2
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C and edges A->B B->C
    When I project with focus "A" and breadth 2 and depth 9
    Then the projection should contain exactly 3 nodes
    And the projected nodes should include "A" at distance 0
    And the projected nodes should include "B" at distance 1
    And the projected nodes should include "C" at distance 2

  @projection @projector
  Scenario: Projector applies depth gradient
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C and edges A->B B->C
    When I project with focus "A" and breadth 2 and depth 9 and gradient True
    Then the projected node "A" should have resolved_depth 9
    And the projected node "B" should have resolved_depth greater than 0
    And the projected node "B" should have resolved_depth less than 9
    And the projected node "C" should have resolved_depth 0

  @projection @projector
  Scenario: Projector without gradient assigns uniform depth
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C and edges A->B B->C
    When I project with focus "A" and breadth 2 and depth 9 and gradient False
    Then the projected node "A" should have resolved_depth 9
    And the projected node "B" should have resolved_depth 9
    And the projected node "C" should have resolved_depth 9

  @projection @projector
  Scenario: Projector resolves named depth via DetailLevelMap
    Given the depth/breadth projection modules are available
    And a code DetailLevelMap is registered for domain "uko-code:"
    And a UKO graph with nodes A B and edges A->B
    When I project with focus "A" and breadth 1 and named depth "FULL_SOURCE" in domain "uko-code:"
    Then the projected node "A" should have resolved_depth 9
    And the projected node "B" should have resolved_depth 0

  @projection @projector
  Scenario: Projector raises error for unresolvable named depth
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A and no edges
    When I project with focus "A" and breadth 0 and named depth "NONEXISTENT" in domain "unknown:"
    Then a projection ValueError should be raised mentioning "no DetailLevelMap"

  @projection @projector
  Scenario: Projector handles multiple focus nodes
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B C D and edges A->B C->D
    When I project with multi-focus "A" and "C" and breadth 1 and depth 5
    Then the projection should contain exactly 4 nodes
    And the projected nodes should include "A" at distance 0
    And the projected nodes should include "C" at distance 0
    And the projected nodes should include "B" at distance 1
    And the projected nodes should include "D" at distance 1

  @projection @projector
  Scenario: Projector converts projection to ContextFragments
    Given the depth/breadth projection modules are available
    And a UKO graph with nodes A B and edges A->B
    When I project to fragments with focus "A" and breadth 1 and depth 4
    Then the result should contain 2 ContextFragments
    And the first fragment uko_node should be "A"
    And all fragments should have metadata key "projected" set to True

  # ---------------------------------------------------------------------------
  # Built-in DetailLevelMap presets
  # ---------------------------------------------------------------------------

  @projection @presets
  Scenario: Code detail level map has correct levels
    Given the depth/breadth projection modules are available
    When I create the code detail level map preset
    Then the code map should resolve "MODULE_LISTING" to 0
    And the code map should resolve "SIGNATURES" to 4
    And the code map should resolve "FULL_SOURCE" to 9

  @projection @presets
  Scenario: Docs detail level map has correct levels
    Given the depth/breadth projection modules are available
    When I create the docs detail level map preset
    Then the docs map should resolve "TITLE_ONLY" to 0
    And the docs map should resolve "FULL_CONTENT" to 10

  @projection @presets
  Scenario: Database detail level map has correct levels
    Given the depth/breadth projection modules are available
    When I create the database detail level map preset
    Then the database map should resolve "SCHEMA_LISTING" to 0
    And the database map should resolve "TABLE_LISTING" to 1
    And the database map should resolve "FULL_CATALOG" to 11

  # ---------------------------------------------------------------------------
  # PlanContextInheritance — skeleton propagation
  # ---------------------------------------------------------------------------

  @inheritance @skeleton
  Scenario: PlanContextInheritance computes child context request
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a PlanContextInheritance service with default config
    When I compute child context with focus "class://Child" and budget 1000
    Then the child result should contain a ContextRequest
    And the child request focus should contain "class://Child"
    And the child request depth_gradient should be True
    And the child result depth_delta should be 1

  @inheritance @skeleton
  Scenario: PlanContextInheritance increases child detail from parent
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a PlanContextInheritance service with default config
    When I compute child context with focus "class://Child" and budget 1000
    Then the child request depth should be greater than 3

  @inheritance @skeleton
  Scenario: PlanContextInheritance narrows child breadth
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a PlanContextInheritance service with default config
    When I compute child context with focus "class://Child" and budget 1000 at depth_in_tree 0 to 1
    Then the child request breadth should be at most 2

  @inheritance @skeleton
  Scenario: PlanContextInheritance injects skeleton fragments
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a mock skeleton compressor that returns 2 fragments
    And a PlanContextInheritance service with the mock compressor
    When I compute child context with focus "class://Child" and budget 1000
    Then the child result skeleton_fragments should have 2 entries

  @inheritance @skeleton
  Scenario: PlanContextInheritance uses DepthReductionCompressor by default
    Given the depth/breadth projection modules are available
    And a parent assembled context with the following inheritance fragments:
      | uko_node                  | content                     | tokens | depth | domain  | resource_uri                  |
      | project://src/app/main.py | def main(): return runner() | 120    | 7     | uko-py: | project://src/app/main.py     |
    And a PlanContextInheritance service with default config
    When I compute child context with focus "class://Child" and budget 1000
    Then the child result skeleton_fragments should have 1 entries
    And all child skeleton fragments should have detail depth at most 1
    And a child skeleton fragment should contain "[MODULE_GRAPH]: symbols=main"

  @inheritance @skeleton @tdd_issue @tdd_issue_4198 @tdd_expected_fail
  Scenario: PlanContextInheritance prioritises fragments near the child focus
    Given the depth/breadth projection modules are available
    And a parent assembled context with the following inheritance fragments:
      | uko_node                  | content                | tokens | depth | domain | resource_uri                  | score |
      | project://src/app/main.py | def main(): return run | 120    | 7     |        | project://src/app/main.py     | 0.2   |
      | project://lib/aux.py      | def aux(): return slow | 120    | 7     |        | project://lib/aux.py          | 0.9   |
    And a PlanContextInheritance service with default config and min_skeleton_tokens 1
    When I compute child context with focus "project://src/app/main.py" and budget 60
    Then the child result skeleton_fragments should have 2 entries
    And the first child skeleton fragment should contain "main.py"

  @inheritance @skeleton
  Scenario: PlanContextInheritance skips skeleton when budget too small
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a mock skeleton compressor that returns 2 fragments
    And a PlanContextInheritance service with the mock compressor and min_skeleton_tokens 500
    When I compute child context with focus "class://Child" and budget 100
    Then the child result skeleton_fragments should have 0 entries

  @inheritance @skeleton
  Scenario: PlanContextInheritance rejects invalid depth delta
    Given the depth/breadth projection modules are available
    And a parent assembled context with 3 fragments at detail_depth 3
    And a PlanContextInheritance service with default config
    When I compute child context with parent_depth 2 and child_depth 1
    Then a projection ValueError should be raised mentioning "child_depth_in_tree"

  @inheritance @skeleton
  Scenario: PlanContextInheritance config uses default skeleton_ratio
    Given the depth/breadth projection modules are available
    When I create an InheritanceConfig with defaults
    Then the inheritance config skeleton_ratio should be 0.15

  @inheritance @skeleton
  Scenario: PlanContextInheritance extract_child_focus returns parent decisions
    Given the depth/breadth projection modules are available
    When I extract child focus from decisions "class://A" and "class://B"
    Then the child focus should include both "class://A" and "class://B"

  @inheritance @skeleton
  Scenario: PlanContextInheritance extract_child_focus uses fallback
    Given the depth/breadth projection modules are available
    When I extract child focus from empty decisions with fallback "class://Default"
    Then the child focus should contain "class://Default"

  # ---------------------------------------------------------------------------
  # ChildContextResult model
  # ---------------------------------------------------------------------------

  @inheritance @model
  Scenario: ChildContextResult is a frozen Pydantic model
    Given the depth/breadth projection modules are available
    When I create a ChildContextResult with a request and skeleton data
    Then the child context result should be immutable
    And the child context result should contain the request