/**
 * pi-shimmer-quotes-spinner — Configuration module
 *
 * Manages user preferences persisted as JSON in the Pi agent directory.
 * All config fields have safe defaults so the extension works out of the box.
 */

import { getAgentDir } from "@earendil-works/pi-coding-agent";
import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";

// ─── Types ──────────────────────────────────────────────────────────────

export type SpinnerStyle = "shimmer" | "classic" | "minimal" | "dots" | "braille";
export type QuoteMode = "inline" | "multiline";
export type TextIntensity = "dim" | "normal" | "bright";

export interface SQConfig {
  /** Spinner animation style */
  spinnerStyle: SpinnerStyle;
  /** Animation speed multiplier (0.25 – 4.0) */
  animationSpeed: number;
  /** How quotes are displayed relative to the working message */
  quoteMode: QuoteMode;
  /** Milliseconds between quote rotations */
  quoteInterval: number;
  /** Where to source quotes from */
  quoteSource: "user" | "bundled" | "all";
  /** Enable color-sweep shimmer on the verb text */
  enableShimmer: boolean;
  /** Enable custom spinner indicator frames (otherwise Pi default) */
  enableCustomSpinner: boolean;
  /** Use built-in fallback quotes when user quotes file is empty/missing */
  enableFallbackQuotes: boolean;
  /** Verb & UI text brightness */
  textIntensity: TextIntensity;
  /** Master toggle */
  enabled: boolean;
}

// ─── Defaults ───────────────────────────────────────────────────────────

export const DEFAULTS: SQConfig = {
  spinnerStyle: "shimmer",
  animationSpeed: 1.0,
  quoteMode: "inline",
  quoteInterval: 8_000,
  quoteSource: "all",
  enableShimmer: true,
  enableCustomSpinner: true,
  enableFallbackQuotes: true,
  textIntensity: "normal",
  enabled: true,
};

const VALID_STYLES = new Set<SpinnerStyle>(["shimmer", "classic", "minimal", "dots", "braille"]);
const VALID_INTENSITIES = new Set<TextIntensity>(["dim", "normal", "bright"]);

// ─── Paths ──────────────────────────────────────────────────────────────

function extensionDir(): string {
  return join(getAgentDir(), "pi-shimmer-quotes-spinner");
}

function configFile(): string {
  return join(extensionDir(), "config.json");
}

// ─── Load / Save ────────────────────────────────────────────────────────

export function loadConfig(): SQConfig {
  try {
    const raw = JSON.parse(readFileSync(configFile(), "utf8")) as Partial<SQConfig>;
    return {
      ...DEFAULTS,
      ...raw,
      spinnerStyle: VALID_STYLES.has(raw.spinnerStyle ?? ("" as SpinnerStyle))
        ? raw.spinnerStyle!
        : DEFAULTS.spinnerStyle,
      quoteMode: raw.quoteMode === "multiline" ? "multiline" : "inline",
      textIntensity: VALID_INTENSITIES.has(raw.textIntensity ?? ("" as TextIntensity))
        ? raw.textIntensity!
        : DEFAULTS.textIntensity,
      animationSpeed: clamp(raw.animationSpeed ?? DEFAULTS.animationSpeed, 0.25, 4.0),
      quoteInterval: clamp(raw.quoteInterval ?? DEFAULTS.quoteInterval, 1_000, 60_000),
    };
  } catch {
    return { ...DEFAULTS };
  }
}

export function saveConfig(config: SQConfig): void {
  try {
    mkdirSync(extensionDir(), { recursive: true });
    writeFileSync(configFile(), JSON.stringify(config, null, 2) + "\n", "utf8");
  } catch {
    // Best-effort persistence
  }
}

export function getQuotesFileDir(): string {
  return extensionDir();
}

// ─── Helpers ────────────────────────────────────────────────────────────

function clamp(val: number, min: number, max: number): number {
  return Math.max(min, Math.min(max, val));
}