/**
 * Bambuddy: filament colors in stock, for the Store's Filament options.
 * Hourly. Read only. GET /api/v1/inventory/spools with an API key (made in
 * Bambuddy's Settings) in the X-API-Key header. The field names below were
 * checked against Greg's Bambuddy on 2026-10-12.
 */
import type { SyncJob } from "../types.ts";
import { mergeOptions, normalizeHex, storeOnLines, type StockOption } from "./stock.ts";

export const BAMBUDDY_DEFAULT_PATH = "/api/v1/inventory/spools";

export interface BambuddyOptions {
  url: string;
  /** Path of the spool or filament inventory endpoint. */
  path?: string;
  /** Sent in the X-API-Key header, or in `authHeader` when that is set. */
  apiKey?: string;
  authHeader?: string;
  /** Option group the colors feed. Default Filament. */
  group?: string;
  /** Only these materials (like PLA, PETG), when set. */
  materials?: string[];
  /** A spool with less filament than this, in grams, counts as out. Default 50. */
  minGrams?: number;
  everyMinutes?: number;
  healthcheckUrl?: string;
}

export interface Spool {
  name: string;
  hex?: string;
  material?: string;
  /** Grams left, when the source says. */
  remaining?: number;
}

/** Plain names for spools Bambuddy leaves unnamed (RFID spools have no color_name). */
const BASIC_COLORS: [string, number, number, number][] = [
  ["Black", 0, 0, 0],
  ["White", 255, 255, 255],
  ["Gray", 128, 128, 128],
  ["Silver", 192, 192, 192],
  ["Red", 200, 30, 40],
  ["Orange", 255, 120, 0],
  ["Yellow", 255, 210, 0],
  ["Green", 0, 160, 70],
  ["Blue", 20, 90, 200],
  ["Purple", 120, 40, 160],
  ["Pink", 240, 110, 170],
  ["Brown", 110, 70, 40],
  ["Beige", 240, 225, 190],
];

/** The nearest of BASIC_COLORS to a #rrggbb hex. */
export function basicColorName(hex: string): string {
  const [r, g, b] = [1, 3, 5].map((i) => parseInt(hex.slice(i, i + 2), 16)) as [number, number, number];
  let best = BASIC_COLORS[0]!;
  let bestD = Infinity;
  for (const c of BASIC_COLORS) {
    const d = (c[1] - r) ** 2 + (c[2] - g) ** 2 + (c[3] - b) ** 2;
    if (d < bestD) [best, bestD] = [c, d];
  }
  return best[0];
}

/**
 * THE ONE PLACE that knows Bambuddy's spool shape. The response is a list (or
 * an object holding one under items). Each spool has material, color_name
 * (often null), rgba like "000000FF", label_weight (grams of filament when
 * full), weight_used and archived_at. A spool with no color_name is named
 * from its color (Black, Blue...); a color name set in Bambuddy wins.
 */
export function mapBambuddySpools(json: unknown): Spool[] {
  const list = Array.isArray(json) ? json : (json as Record<string, unknown> | null)?.items;
  if (!Array.isArray(list)) throw new Error("Bambuddy answered with no list of spools");
  const out: Spool[] = [];
  for (const raw of list) {
    if (!raw || typeof raw !== "object") continue;
    const o = raw as Record<string, unknown>;
    if (o.archived_at) continue;
    const hex = normalizeHex(o.rgba);
    const named = typeof o.color_name === "string" && o.color_name.trim() ? o.color_name.trim() : undefined;
    const name = named ?? (hex ? basicColorName(hex) : undefined);
    if (!name) continue;
    const s: Spool = { name };
    if (hex) s.hex = hex;
    if (typeof o.material === "string") s.material = o.material.trim();
    if (typeof o.label_weight === "number") s.remaining = o.label_weight - (typeof o.weight_used === "number" ? o.weight_used : 0);
    out.push(s);
  }
  return out;
}

/** Spools as Filament options: in stock when some spool of that color has enough left. */
export function filamentOptions(spools: Spool[], o: Pick<BambuddyOptions, "materials" | "minGrams"> = {}): StockOption[] {
  const materials = o.materials?.length ? new Set(o.materials.map((m) => m.toLowerCase())) : null;
  const min = o.minGrams ?? 50;
  return mergeOptions(
    spools
      .filter((s) => !materials || (s.material && materials.has(s.material.toLowerCase())))
      .map((s) => ({ name: s.name, ...(s.hex ? { hex: s.hex } : {}), inStock: s.remaining === undefined || s.remaining >= min })),
  );
}

export function bambuddyJob(o: BambuddyOptions): SyncJob {
  const group = o.group ?? "Filament";
  return {
    name: "bambuddy",
    everyMinutes: o.everyMinutes ?? 60,
    healthcheckUrl: o.healthcheckUrl,
    async run(ctx) {
      const headers: Record<string, string> = { accept: "application/json" };
      if (o.apiKey) headers[(o.authHeader || "x-api-key").toLowerCase()] = o.apiKey;
      const url = `${o.url.replace(/\/$/, "")}/${(o.path ?? BAMBUDDY_DEFAULT_PATH).replace(/^\//, "")}`;
      const res = await ctx.fetch(url, { headers });
      if (res.status === 401 || res.status === 403) throw new Error(`Bambuddy refused the request (${res.status}); check BAMBUDDY_API_KEY (made in Bambuddy's Settings)`);
      if (!res.ok) throw new Error(`Bambuddy answered ${res.status}; check BAMBUDDY_SPOOLS_PATH`);
      const options = filamentOptions(mapBambuddySpools(await res.json()), o);
      const lines = storeOnLines(ctx, "filamentStock", [{ group, options }]);
      const inStock = options.filter((x) => x.inStock).length;
      return { message: `${inStock} of ${options.length} colors in stock, on ${lines} lines`, counts: { colors: options.length, inStock, lines } };
    },
  };
}