Feature: TUI conversation module coverage
  Directly exercises the cleveragents.tui.conversation module to cover
  pruning hysteresis, settings clamping, persistence loading, and edge
  cases that the high-level TUI scenarios do not reach.

  @tdd_issue @tdd_issue_6350
  Scenario: Default ConversationSettings derive trigger_line_count from low_mark and excess
    When I build default ConversationSettings
    Then conversation settings prune_low_mark should equal 1500
    And conversation settings prune_excess should equal 1000
    And conversation settings trigger_line_count should equal 2500

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationSettings clamps prune_low_mark below the minimum
    When I build ConversationSettings with prune_low_mark 10 prune_excess 200 preserve_recent_lines 50
    Then conversation settings prune_low_mark should equal 100
    And conversation settings prune_excess should equal 200
    And conversation settings preserve_recent_lines should equal 50

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationSettings clamps prune_low_mark above the maximum
    When I build ConversationSettings with prune_low_mark 99999 prune_excess 200 preserve_recent_lines 50
    Then conversation settings prune_low_mark should equal 10000

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationSettings clamps prune_excess below the minimum
    When I build ConversationSettings with prune_low_mark 500 prune_excess 1 preserve_recent_lines 50
    Then conversation settings prune_excess should equal 10

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationSettings clamps prune_excess above the maximum
    When I build ConversationSettings with prune_low_mark 500 prune_excess 99999 preserve_recent_lines 50
    Then conversation settings prune_excess should equal 5000

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationSettings clamps preserve_recent_lines below zero
    When I build ConversationSettings with prune_low_mark 500 prune_excess 100 preserve_recent_lines -25
    Then conversation settings preserve_recent_lines should equal 0

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationBlock line_count counts trailing newlines and empty text
    Then a conversation block with text "alpha" should have line count 1
    And a conversation block with text "alpha\nbeta" should have line count 2
    And a conversation block with empty text should have line count 0

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream bootstrap installs a protected welcome block
    Given a fresh ConversationStream with default settings
    When I bootstrap the stream with welcome text "Hello world"
    Then the stream should have exactly 1 block
    And the stream total_lines should be greater than zero
    And the stream rendered text should contain "Hello world"

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream clear empties blocks and resets total_lines
    Given a fresh ConversationStream with default settings
    When I bootstrap the stream with welcome text "Hello"
    And I clear the stream
    Then the stream should have exactly 0 blocks
    And the stream total_lines should be zero

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream extend appends multiple blocks
    Given a fresh ConversationStream with default settings
    When I extend the stream with 3 plain message blocks
    Then the stream should have exactly 3 blocks
    And the stream rendered text should contain "extend-block-2"

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream renders markup blocks verbatim and escapes plain blocks
    Given a fresh ConversationStream with default settings
    When I add a plain block "[red]plain[/]" to the stream
    And I add a markup block "[red]styled[/]" to the stream
    Then the stream rendered text should contain "[red]styled[/]"
    And the stream rendered plain segment should be backslash escaped

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream skips empty-text blocks during render
    Given a fresh ConversationStream with default settings
    When I add an empty plain block to the stream
    And I add a plain block "after-empty" to the stream
    Then the stream rendered text should equal "after-empty"

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream pruning preserves protected blocks
    Given a fresh ConversationStream with low_mark 200 excess 50 preserve_recent_lines 100
    When I bootstrap the stream with welcome text "Protected welcome"
    And I deliver 4 plain blocks of 200 lines each through add_block
    Then the stream rendered text should contain "Protected welcome"
    And the stream total_lines should be less than or equal to 350

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream pruning counts rendered separators between blocks
    Given a fresh ConversationStream with low_mark 100 excess 50 preserve_recent_lines 0
    When I deliver 100 plain blocks of 1 lines each through add_block
    Then the stream should have exactly 1 note block
    And the stream rendered text should not contain "plain-1-line-1"
    And the stream total_lines should equal the rendered line count
    And the stream rendered line count should be less than or equal to 150

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream pruning updates the note in place rather than re-inserting
    Given a fresh ConversationStream with low_mark 200 excess 50 preserve_recent_lines 100
    When I deliver 8 plain blocks of 200 lines each through add_block
    Then the stream should have exactly 1 note block

  @tdd_issue @tdd_issue_6350
  Scenario: ConversationStream pruning with preserve_recent_lines zero allows full prune
    Given a fresh ConversationStream with low_mark 200 excess 50 preserve_recent_lines 0
    When I deliver 6 plain blocks of 200 lines each through add_block
    Then the stream total_lines should be less than or equal to 250

  @tdd_issue @tdd_issue_6350
  Scenario: load_conversation_settings returns defaults when the config file is absent
    When I load conversation settings from a missing config path
    Then loaded settings prune_low_mark should equal 1500
    And loaded settings prune_excess should equal 1000

  @tdd_issue @tdd_issue_6350
  Scenario: load_conversation_settings returns defaults when the config file is malformed JSON
    When I load conversation settings from a malformed JSON config
    Then loaded settings prune_low_mark should equal 1500
    And loaded settings prune_excess should equal 1000

  @tdd_issue @tdd_issue_6350
  Scenario: load_conversation_settings honours explicit ui values
    When I load conversation settings from a config with low_mark 800 excess 400
    Then loaded settings prune_low_mark should equal 800
    And loaded settings prune_excess should equal 400

  @tdd_issue @tdd_issue_6350
  Scenario: load_conversation_settings returns defaults when ui values are non-numeric
    When I load conversation settings from a config with non-numeric values
    Then loaded settings prune_low_mark should equal 1500
    And loaded settings prune_excess should equal 1000

  @tdd_issue @tdd_issue_6350
  Scenario: load_conversation_settings returns defaults when payload is not a dict
    When I load conversation settings from a list-valued JSON config
    Then loaded settings prune_low_mark should equal 1500
    And loaded settings prune_excess should equal 1000