tui

type ChatItem struct {
	Role      string // "user" | "assistant" | "tool" | "phase" | "error" | "system"
	Content   string
	Timestamp time.Time
	Plan      *ai.PlanSummary
	Diffs     []string
	ToolName  string
	ToolArgs  map[string]any
	IsError   bool
	Detail    string        // short tool-result summary, e.g. "120 lines"
	Diff      string        // inline diff shown under create/edit tool lines
	Elapsed   time.Duration // for phase lines
}

type Mode int

type Model struct {
	Agent    *ai.Agent
	Mode     Mode
	Viewport viewport.Model
	// TextInput is a textarea, not a single-line input: prompts are often
	// several sentences or contain pasted code, and a box that cannot grow
	// hides everything above the last line.
	TextInput          textarea.Model
	StepInput          textinput.Model
	CustomInput        textinput.Model
	Spinner            spinner.Model
	SelectedStep       int
	IsEditingStep      bool
	StreamBuffer       *strings.Builder
	Messages           []ChatItem
	CurrentDiffs       []string
	History            []string
	HistoryIndex       int
	Width              int
	Height             int
	StatusText         string
	ErrorMessage       string
	OneShot            bool
	Ready              bool
	OriginalPrompt     string
	ClarificationPlan  *ai.PlanSummary
	CurrentQuestionIdx int
	PendingApproval    *pendingApproval
	// PlanFirst routes requests through the staged plan → approve → execute
	// pipeline instead of the conversational loop (nimbus ai --plan-only).
	PlanFirst    bool
	SessionUsage ai.SessionUsage
	// ExpandDiffs shows full diffs instead of the collapsed change summary,
	// toggled with ctrl+o.
	ExpandDiffs bool
	// PaletteIndex is the highlighted row of the slash-command menu, which is
	// open whenever the input begins with "/".
	PaletteIndex int
	// QueuedPrompt is a message typed while the agent was working. It is sent
	// as soon as the current turn finishes, so a thought does not have to wait
	// for the run to end before it can be written down.
	QueuedPrompt string

	SelectedOptionIdx    int
	ClarificationAnswers map[string]string
	IsCustomInput        bool
	ExecChan             chan tea.Msg

	// Phase is the agent's current activity ("Exploring the codebase…").
	Phase      string
	PhaseStart time.Time
	ToolCalls  int
	// FinalSummary is the last completed run's summary (printed after a
	// one-shot run exits the alt screen).
	FinalSummary string

	// SettingsUI is the /settings screen's state, live only in ModeSettings.
	SettingsUI settingsState

	// Claude-Code-style thinking indicator state
	IsThinking        bool
	ThinkingStartTime time.Time
	ThinkingVerb      string
	LastThinkingVerb  string
	ThinkingTokens    int
	LastVerbChange    time.Time
	// contains filtered or unexported fields
}

type SlashCommand struct {
	Name    string   // canonical form, with the leading slash
	Aliases []string // other spellings that dispatch to it
	Summary string   // one line, shown in the menu
}