Feature: Devcontainer Lifecycle State Model
  As a CleverAgents developer
  I want the container lifecycle state model to enforce valid transitions
  So that containers follow a predictable state machine

  # ── Lifecycle state model ──────────────────────────────────

  Scenario: ContainerLifecycleState has all required values
    When I inspect ContainerLifecycleState enum values
    Then the lifecycle enum should contain "discovered"
    And the lifecycle enum should contain "building"
    And the lifecycle enum should contain "running"
    And the lifecycle enum should contain "stopping"
    And the lifecycle enum should contain "stopped"
    And the lifecycle enum should contain "failed"

  Scenario: Valid transitions are accepted
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000001"
    When I transition from "discovered" to "building"
    Then the transition should succeed
    And the tracker state should be "building"

  Scenario: Active transition after starting
    Given a lifecycle tracker in "building" state for resource "01TESTLIFECYCLE0000000002"
    When I transition from "building" to "running"
    Then the transition should succeed
    And the tracker state should be "running"

  Scenario: Invalid transition is rejected
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000003"
    When I attempt to transition from "discovered" to "running"
    Then the transition should raise ValueError

  Scenario: Stopping to error transition is valid
    Given a lifecycle tracker in "stopping" state for resource "01TESTLIFECYCLE0000000004"
    When I transition from "stopping" to "failed"
    Then the transition should succeed
    And the tracker state should be "failed"

  Scenario: Error to starting transition is valid for retry
    Given a lifecycle tracker in "failed" state for resource "01TESTLIFECYCLE0000000005"
    When I transition from "failed" to "building"
    Then the transition should succeed
    And the tracker state should be "building"

  Scenario: Stopped to starting transition is valid for rebuild
    Given a lifecycle tracker in "stopped" state for resource "01TESTLIFECYCLE0000000006"
    When I transition from "stopped" to "building"
    Then the transition should succeed

  Scenario: Transition history is recorded
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000007"
    When I transition from "discovered" to "building"
    Then the tracker should have 1 transition in history

  # ── Lifecycle registry ─────────────────────────────────────

  Scenario: Lifecycle tracker persists state across calls
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000060"
    When I transition from "discovered" to "building"
    And I retrieve the tracker for "01TESTLIFECYCLE0000000060"
    Then the retrieved tracker state should be "building"

  Scenario: List active containers returns only active ones
    Given a mock devcontainer CLI runner
    And the runner configured for successful activation
    And an active container "01TESTLIFECYCLE0000000070" with container ID "ctr-x"
    And a lifecycle tracker for resource "01TESTLIFECYCLE0000000071"
    When I list active containers
    Then the active list should contain "01TESTLIFECYCLE0000000070"
    And the active list should not contain "01TESTLIFECYCLE0000000071"

  # ── JSON output parsing ────────────────────────────────────

  Scenario: Parse valid devcontainer up JSON output
    When I parse devcontainer up output with containerId "abcdef123456" and workspace "/ws"
    Then the parsed container ID should be "abcdef123456"
    And the parsed workspace path should be "/ws"

  Scenario: Parse invalid devcontainer up JSON output gracefully
    When I parse devcontainer up output with invalid JSON
    Then the parsed container ID should be None
    And the parsed workspace path should be None

  # ── Argument validation ────────────────────────────────────

  Scenario: validate_transition rejects wrong types
    When I call validate_transition with non-enum arguments
    Then it should raise TypeError

  Scenario: validate_transition rejects wrong to_state type
    When I call validate_transition with non-enum to_state
    Then it should raise TypeError

  Scenario: transition_state rejects wrong tracker type
    When I call transition_state with non-tracker argument
    Then it should raise TypeError

  Scenario: transition_state rejects wrong to_state type
    When I call transition_state with non-enum to_state argument
    Then it should raise TypeError

  # ── Registry edge cases ────────────────────────────────────

  Scenario: get_lifecycle_tracker rejects empty resource_id
    When I attempt to get tracker with empty resource_id
    Then the get tracker should raise ValueError

  Scenario: set_lifecycle_tracker rejects wrong type
    When I attempt to set tracker with wrong type
    Then the set tracker should raise TypeError

  # ── R13: Additional invalid transition coverage ────────────

  Scenario: Invalid transition running to building is rejected
    Given a lifecycle tracker in "running" state for resource "01TESTLIFECYCLE0000000240"
    When I attempt to transition from "running" to "building"
    Then the transition should raise ValueError

  Scenario: Invalid transition stopped to running is rejected
    Given a lifecycle tracker in "stopped" state for resource "01TESTLIFECYCLE0000000241"
    When I attempt to transition from "stopped" to "running"
    Then the transition should raise ValueError

  Scenario: Invalid transition building to stopped is rejected
    Given a lifecycle tracker in "building" state for resource "01TESTLIFECYCLE0000000242"
    When I attempt to transition from "building" to "stopped"
    Then the transition should raise ValueError

  Scenario: Invalid transition failed to running is rejected
    Given a lifecycle tracker in "failed" state for resource "01TESTLIFECYCLE0000000243"
    When I attempt to transition from "failed" to "running"
    Then the transition should raise ValueError

  Scenario: Invalid transition discovered to stopping is rejected
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000244"
    When I attempt to transition from "discovered" to "stopping"
    Then the transition should raise ValueError

  Scenario: Invalid transition building to discovered is rejected
    Given a lifecycle tracker in "building" state for resource "01TESTLIFECYCLE0000000245"
    When I attempt to transition from "building" to "discovered"
    Then the transition should raise ValueError

  # ── R4: Multi-line JSON output parsing ─────────────────────

  Scenario: Parse devcontainer up output with log lines before JSON
    When I parse devcontainer up output with log lines before JSON
    Then the parsed container ID should be "aabbccddee0099887766"
    And the parsed workspace path should be "/workspaces/multi"

  # ── T1: Transition history cap at 100 ──────────────────────

  Scenario: Transition history is capped at 100 entries
    Given a lifecycle tracker for resource "01TESTLIFECYCLE0000000300"
    When I perform 105 transitions cycling through valid states
    Then the tracker should have at most 100 transitions

  # ── S1: Container ID format validation ─────────────────────

  Scenario: Invalid container ID format is rejected during parsing
    When I parse devcontainer up output with invalid container ID "not-a-hex-id!"
    Then the parsed container ID should be empty

  # ── F11: Invalid workspace path rejected during parsing ────

  Scenario: Parse devcontainer up output with relative workspace path
    When I parse devcontainer up output with relative workspace "relative/ws"
    Then the parsed container ID should be "aabbccddee0011223344"
    And the parsed workspace path should be None

  # ── R7-F8: Terminal tracker eviction ────────────────────────

  Scenario: Terminal tracker eviction removes oldest stopped trackers
    Given 210 stopped container trackers in the registry
    When I run terminal tracker eviction
    Then the registry should have at most 200 terminal trackers

  # ── TEST-3: Coverage gap scenarios ──────────────────────────

  Scenario: evict_terminal_trackers returns 0 when below threshold
    Given 50 stopped container trackers in the registry
    When I run terminal tracker eviction
    Then the eviction count should be 0

  Scenario: get_lifecycle_tracker auto-creates tracker for new resource
    When I get tracker for new resource "01TESTLIFECYCLE0000000730"
    Then the auto-created tracker state should be "discovered"
    And the auto-created tracker resource_id should be "01TESTLIFECYCLE0000000730"

  Scenario: clear_lifecycle_registry stops health check threads
    Given a mock devcontainer CLI runner
    And the runner configured for successful health check
    And an active container "01TESTLIFECYCLE0000000740" with container ID "ctr-clr"
    And a running health check for "01TESTLIFECYCLE0000000740"
    When I clear the lifecycle registry
    Then the registry should be empty
    And the health check for "01TESTLIFECYCLE0000000740" should be unregistered