/**
 * `accent` is the brand color (primary actions, focus, selection), not a status. Statuses use
 * success, warning (in progress, needs attention), danger, or merged (finished work: merged, applied,
 * completed).
 */
export type Tone = "neutral" | "accent" | "success" | "warning" | "danger" | "merged";

/**
 * Tinted surfaces (callouts, status rows, selected toggles). Borderless: the fill alone carries the
 * tone. Never pair a tinted fill with a contrasting border.
 */
export const TONE_SURFACE: Record<Tone, string> = {
  neutral: "bg-gray-900 text-gray-300",
  accent: "bg-accent-950 text-accent-200",
  success: "bg-success-950 text-success-200",
  warning: "bg-warning-950 text-warning-200",
  danger: "bg-danger-950 text-danger-200",
  merged: "bg-merged-950 text-merged-200",
};

/** Solid badge fills: no border, readable text on the fill. */
export const TONE_BADGE: Record<Tone, string> = {
  neutral: "bg-gray-800 text-gray-200",
  accent: "bg-accent-500 text-gray-950",
  success: "bg-success-700 text-white",
  warning: "bg-warning-400 text-gray-950",
  danger: "bg-danger-700 text-white",
  merged: "bg-merged-600 text-white",
};

/** Solid fills (dots, progress tracks). */
export const TONE_FILL: Record<Tone, string> = {
  neutral: "bg-gray-500",
  accent: "bg-accent-500",
  success: "bg-success-500",
  warning: "bg-warning-400",
  danger: "bg-danger-500",
  merged: "bg-merged-500",
};

/** Pressed/selected state for bordered toggles: the border disappears into the fill. */
export const SELECTED_SURFACE = "border-transparent bg-accent-950 text-accent-200";

/**
 * Tone for an issue or pull request state. Purple means finished work (merged, completed). A closed
 * pull request is only purple when it is known to be merged.
 */
export function issueStateTone(state: string, kind: { pull?: boolean; merged?: boolean } = {}): Tone {
  if (kind.merged) return "merged";
  if (state === "open") return "success";
  return kind.pull ? "neutral" : "merged";
}