-- allium: 1
-- Terminal UI (issue #26, phase 4)
-- Scope: extension (second renderer over the shared UI core)
-- Distilled from: lib/bds/tui.ex, lib/bds/ui/sidebar.ex, lib/bds/ui/post_editor/*.ex

entity TuiState {
    view: posts | media | templates | scripts | tags | settings | git
    focus: sidebar | editor
    selected_index: Integer
    editing_post: Boolean
    -- The editor drives the same BDS.UI.PostEditor workflow as the GUI:
    -- canonical-language edits update the post, other languages update
    -- translations; publish routes through the same publishing pipeline.
}

surface TuiSurface {
    facing _: TuiRuntime

    provides:
        TuiKeyPressed(code, modifiers)
        TuiEventReceived(entity, entity_id, action)
        TuiSettingsChanged(key)
        ShellTaskCompleted(route)
}

rule SidebarNavigation {
    when: TuiKeyPressed(code: "up" | "down" | "j" | "k")
    -- Selection moves over the flattened sidebar items and skips
    -- section headers; data comes from BDS.UI.Sidebar.view, identical
    -- to the GUI sidebar content.
    ensures: TuiState.selected_index.updated()
}

rule OpenEntry {
    when: TuiKeyPressed(code: "enter")
    -- Posts open in the editor by default (title + textarea seeded from
    -- the persisted form; syntax highlighting and word wrap on; ctrl+e
    -- switches to the rendered preview). New empty posts created with
    -- "n" open in the editor as well. Images open in the terminal image
    -- preview. Other entities report that terminal editing is not
    -- available yet.
    ensures: TuiState.editing_post.updated()
}

rule SaveAndPublish {
    when: TuiKeyPressed(code: "s" | "p", modifiers: "ctrl")
    -- ctrl+s saves the draft, ctrl+p saves and publishes — both through
    -- BDS.UI.PostEditor.Persistence, so files, embeddings, search, and
    -- the event bus behave exactly as a GUI save.
    ensures: PostPersisted()
}

rule EditorMode {
    when: TuiKeyPressed(code: "e", modifiers: "ctrl")
    -- ctrl+e toggles between the syntax-highlighted editor (the default
    -- mode when opening a post) and the read-only rendered-Markdown
    -- preview (rendered through tui-markdown so headings/emphasis/lists
    -- are styled); keys in preview never edit content, and esc returns
    -- to the sidebar from either mode.
    ensures: PreviewToggled()
}

rule CodeEditorWrapping {
    when: TuiState.editing_post.updated()
    -- The post editor renders the buffer with syntax highlighting
    -- (markdown with [[macro]] accents for posts, HTML+Liquid for
    -- templates, Lua for scripts), soft-wraps long lines to the
    -- viewport width, keeps the cursor's visual row visible while
    -- scrolling, and highlights the cursor's source line. There is no
    -- line-number gutter.
    ensures: TuiState.updated()
}

rule AiQuickAction {
    when: TuiKeyPressed(code: "g", modifiers: "ctrl")
    -- One-shot AI post analysis (title/excerpt suggestions). Gated by
    -- airplane mode: without a local endpoint the TUI shows a status
    -- message instead of calling out.
    ensures: AiSuggestionsRequestedOrRefused()
}

rule ProjectSwitcher {
    when: TuiKeyPressed(code: "p")
    -- "p" opens the projects overlay: all projects from the caching
    -- database with the active one marked; enter activates the selected
    -- project (BDS.Projects.set_active_project) and reloads the sidebar.
    -- "o" switches to a folder-path prompt with bash-style tab
    -- completion: tab completes a unique directory (trailing slash
    -- appended), an ambiguous prefix completes to the longest common
    -- prefix and lists the candidate folders; only directories are
    -- offered, dotfolders only for a dot-prefixed input, and a leading
    -- "~" expands to the home directory. A typed path is validated
    -- to be an existing directory, then opened as a project
    -- (BDS.Projects.create_project with data_path, named after the
    -- folder) and activated; a full database rebuild is queued
    -- automatically through the rebuild_database shell command so the
    -- folder's content is loaded into the caching database. Invalid
    -- paths keep the prompt open and report the error.
    ensures: ProjectSwitchedOrOpened()
}

rule SidebarSearch {
    when: TuiKeyPressed(code: "/")
    -- "/" in sidebar focus opens a vi-style search prompt in the status
    -- line that live-filters the current view through the same
    -- BDS.UI.Sidebar filter params the GUI sidebar uses (posts, pages,
    -- media). Plain words are a text search, "tag:x" and "category:x"
    -- filter like the GUI chips, and an ISO date (yyyy-mm-dd) narrows
    -- to that day — the day filter extends the shared sidebar queries.
    -- Tokens combine with AND. Enter keeps the filter (shown appended
    -- to the sidebar title), esc clears it; filters are per view.
    ensures: SidebarFiltered()
}

rule CommandPrompt {
    when: TuiKeyPressed(code: ":")
    -- Vi-style prompt: ":" opens a filterable list of the parameterless
    -- Blog-menu shell commands (metadata diff, validate site, force
    -- render, rebuilds, reindex, translations, duplicates, upload,
    -- browser preview URL) and runs the selection through the same
    -- BDS.Desktop.ShellCommands backend as the GUI menu; typing ":?"
    -- shows the full list as help. Overlays clear the cells beneath
    -- them. Commands whose follow-up UI is GUI-only (validate
    -- translations, find duplicates) are marked. Queued tasks report
    -- progress in the status line until all tasks finish.
    ensures: CommandListShownOrExecuted()
}

rule SettingsPanel {
    when: TuiKeyPressed(code: "6")
    -- "6" opens the settings panel (issue #29), matching the GUI panel
    -- numbering: the sidebar lists the same preference sections as the
    -- settings backends (Project, Editor, Content, AI, Technology,
    -- Publishing, Data, MCP). The GUI-only Style tab is intentionally
    -- absent. Enter on a section opens a section-specific editor in the
    -- main area: a generic typed-field form from BDS.UI.SettingsForm.
    -- Enter edits a text field in a status-line prompt, toggles a
    -- boolean, or cycles an enum through its options; read-only info
    -- rows are skipped by the selection. ctrl+s saves the section
    -- through the same backends as the GUI editor (BDS.Metadata,
    -- BDS.Settings, BDS.AI, BDS.MCP.AgentConfig) and reloads the form;
    -- esc cancels the prompt, then closes the form. Category removal
    -- and AI model discovery remain GUI-only.
    ensures: SettingsFormShownEditedOrSaved()
}

rule TagsPanel {
    when: TuiKeyPressed(code: "5")
    -- "5" opens the tags view (issue #34), matching the GUI panel
    -- numbering. The sidebar lists the same three sections as the GUI
    -- tags editor (Tag Cloud, Create / Edit, Merge Tags — from
    -- BDS.UI.Sidebar's tags nav view); enter opens the section in the
    -- main area, all backed by BDS.UI.TagsPanel over the same BDS.Tags
    -- operations as the GUI editor. Cloud lists tags with their post
    -- usage counts ordered by usage; manage is alphabetical with "n"
    -- (create prompt), enter (rename prompt), "c" (cycle colour through
    -- the shared presets), "t" (cycle post template), "d" then "y"
    -- (delete with post-count confirmation; any other key cancels) and
    -- "s" (sync tags from post tags); merge marks tags with space and
    -- "m" merges the marked tags into the selected one (at least two,
    -- target included). Text prompts live in the status line; esc
    -- cancels the prompt, then closes the panel. Domain tag events
    -- reload an open panel, keeping it in sync with GUI and CLI writes.
    ensures: TagsPanelShownOrEdited()
}

rule GitPanel {
    when: TuiKeyPressed(code: "7")
    -- "7" opens the git panel (issue #30) for content sync: the sidebar
    -- lists the changed files from git status (code + path, branch with
    -- ahead/behind counts in the title) with the commit history in its
    -- lower half, like the GUI (short hash + subject; ↑ marks commits
    -- that still need a push, ↓ remote-only ones), the main area shows a
    -- scrollable whole-folder diff (staged + unstaged, capped) paged
    -- with pgup/pgdn; enter on a file jumps the diff to it. "c" opens a
    -- status-line commit prompt (git add -A + commit, empty messages
    -- rejected), "u" pulls (ff-only) and "s" pushes — both run off the
    -- UI process and report back as a status toast. Every action is
    -- BDS.Git, the same backend as the GUI git panel. A project folder
    -- that is not a git repository shows a message and refuses the
    -- actions.
    ensures: GitPanelShownOrSynced()
}

rule ReportPanels {
    when: ShellTaskCompleted(route: "metadata_diff" | "site_validation")
    -- Completed metadata diff and site validation tasks open a
    -- scrollable report panel showing the differences. Enter applies
    -- the whole report — metadata diff repairs all items from the
    -- filesystem (file → db) and imports orphan files; site validation
    -- applies the full report incrementally (render missing, remove
    -- extra, re-render updated), matching the GUI defaults. Esc closes
    -- the report without applying. Reports completed before this
    -- session started never pop up.
    ensures: ReportShownThenAppliedOrCancelled()
}

rule MultiClientSync {
    when: TuiEventReceived(entity, entity_id, action)
    -- Domain events refresh the sidebar; a post deleted elsewhere closes
    -- the open editor. Keeps TUI sessions synchronized with GUI clients
    -- and pipeline ingestion.
    ensures: TuiState.updated()
}

rule ServerSideLocale {
    when: TuiSettingsChanged(key: "ui.language")
    -- The TUI re-reads the server-side UI language and re-renders; all
    -- clients always share one language.
    ensures: TuiRelocalized()
}