// Diffusion in the editor, without VS Code (oxygenhub-vscode#5): how a pin
// between an upstream and its consumer looks. The hub's pill has two halves,
// the upstream's state and the consumer's; a tree row has one icon, so it
// shows the more urgent of the two and says both in words.

import type { DiffusionHalf, DiffusionPin } from "./hubapi";

/** A codicon and a theme colour id. */
export interface Look {
  icon: string;
  color: string;
}

/** Most urgent first: a failure, then what nothing checked, then waiting. */
const URGENCY = ["red", "amber", "grey", "green", "off"];

/** The tone a row shows: the more urgent half, ignoring a consumer that does not follow. */
export function tone(pin: DiffusionPin): string {
  const tones = [pin.upstream_state.tone, pin.consumer_state.tone].filter((t) => t !== "off");
  return tones.sort((a, b) => rank(a) - rank(b))[0] ?? "off";
}

function rank(t: string): number {
  const i = URGENCY.indexOf(t);
  return i < 0 ? URGENCY.length : i;
}

export function look(t: string): Look {
  switch (t) {
    case "green":
      return { icon: "pass-filled", color: "testing.iconPassed" };
    case "red":
      return { icon: "error", color: "testing.iconFailed" };
    case "amber":
      return { icon: "warning", color: "list.warningForeground" };
    case "grey":
      return { icon: "clock", color: "testing.iconQueued" };
    default:
      return { icon: "circle-outline", color: "disabledForeground" };
  }
}

/** The row's name: the repository on the other end of the pin. */
export function pinLabel(pin: DiffusionPin, side: "takes" | "gives"): string {
  return side === "takes" ? pin.upstream : pin.consumer;
}

/** "untested │ passes · 2 behind · bump #304", as the hub's pill reads. */
export function pinDescription(pin: DiffusionPin): string {
  const parts = [`${pin.upstream_state.word} │ ${pin.consumer_state.word}`];
  if (pin.behind !== null && pin.behind !== undefined && pin.behind > 0) {
    parts.push(`${pin.behind} behind`);
  }
  if (pin.bump !== null && pin.bump !== undefined) {
    parts.push(`bump #${pin.bump}`);
  }
  return parts.join(" · ");
}

const FOLLOW: Record<string, string> = { off: "does not follow", green: "follows when the upstream is green", any: "follows every move" };

/** The tooltip, in Markdown: both halves' sentences, then the pin. */
export function pinTooltip(pin: DiffusionPin): string {
  const half = (who: string, h: DiffusionHalf) => `**${who}: ${h.word}.** ${h.title}`;
  const run = pin.run !== null && pin.run !== undefined ? ` · run #${pin.run}${pin.run_status ? ` ${pin.run_status}` : ""}` : "";
  return [
    half(pin.upstream, pin.upstream_state),
    half(pin.consumer, pin.consumer_state),
    `Pinned at \`${pin.path}\` on \`${pin.bookmark}\`; ${pin.consumer} ${FOLLOW[pin.follow] ?? pin.follow}.${pin.bump !== null && pin.bump !== undefined ? ` Open bump #${pin.bump}${run}.` : ""}`,
  ].join("\n\n");
}