/**
 * Map a saved BadgeBatch (config) into CreateBadgePanel form state.
 */
import type { BadgeBatchRecord, BadgeLayoutElementPayload } from "../../../services/api/badgeBatches";
import type { BadgeBackgroundImageLayout, BadgeLayoutElement } from "./badgeLayout";
import { defaultBackgroundImageLayout, defaultLayoutForFields, parseBackgroundImageLayout } from "./badgeLayout";

export type BadgeFormState = {
  formName: string;
  formEventId: string;
  sizePreset: "a6" | "a7" | "4x3in" | "4x6in" | "custom";
  customW: string;
  customH: string;
  orientation: "portrait" | "landscape";
  includeFaculty: boolean;
  includeParticipants: boolean;
  participantScope: "all" | "participant_list";
  participantListId: string;
  backgroundMode: "image" | "color";
  backgroundColor: string;
  backgroundImageUrl: string;
  backgroundImageLayout: BadgeBackgroundImageLayout;
  enabledFields: string[];
  layoutElements: BadgeLayoutElement[];
  customTexts: { id: string; text: string }[];
  customImages: { id: string; imageUrl: string }[];
  outputFormat: "pdf" | "png" | "jpeg";
  badgeTypeLabel: string;
};

function eventIdFromBatch(batch: BadgeBatchRecord): string {
  const ev = batch.event;
  if (typeof ev === "string") return ev;
  if (ev && typeof ev === "object" && "_id" in ev) return String(ev._id);
  return "";
}

function duplicateExportName(name: string): string {
  const base = (name || "Badge export").trim();
  const copy = `Copy of ${base}`;
  return copy.length > 120 ? `${copy.slice(0, 117)}…` : copy;
}

function asConfig(batch: BadgeBatchRecord): Record<string, unknown> {
  return (batch.config && typeof batch.config === "object" ? batch.config : {}) as Record<string, unknown>;
}

function str(v: unknown, fallback = ""): string {
  return typeof v === "string" ? v : fallback;
}

function bool(v: unknown, fallback: boolean): boolean {
  return typeof v === "boolean" ? v : fallback;
}

function numStr(v: unknown, fallback: string): string {
  if (typeof v === "number" && Number.isFinite(v)) return String(v);
  return fallback;
}

function sizePresetFromConfig(c: Record<string, unknown>): BadgeFormState["sizePreset"] {
  const p = str(c.sizePreset, "a6");
  if (p === "a7" || p === "4x3in" || p === "4x6in" || p === "custom") return p;
  return "a6";
}

function layoutFromConfig(c: Record<string, unknown>): BadgeLayoutElement[] {
  const raw = c.layout;
  if (!Array.isArray(raw) || raw.length === 0) return [];
  return raw
    .filter((el): el is BadgeLayoutElementPayload => el != null && typeof el === "object" && typeof (el as BadgeLayoutElementPayload).id === "string")
    .map((el) => ({ ...el })) as BadgeLayoutElement[];
}

function customTextsFromConfig(c: Record<string, unknown>, layout: BadgeLayoutElement[]): { id: string; text: string }[] {
  const fromConfig = Array.isArray(c.customTexts)
    ? c.customTexts
        .filter((x): x is { id: string; text: string } => x != null && typeof x === "object" && typeof (x as { id: string }).id === "string")
        .map((x) => ({ id: String(x.id), text: String((x as { text?: string }).text ?? "") }))
    : [];
  if (fromConfig.length) return fromConfig;
  return layout
    .filter((el) => el.kind === "custom_text")
    .map((el) => ({ id: el.id, text: str(el.text, "Your text") }));
}

function customImagesFromConfig(c: Record<string, unknown>, layout: BadgeLayoutElement[]): { id: string; imageUrl: string }[] {
  const fromConfig = Array.isArray(c.customImages)
    ? c.customImages
        .filter((x): x is { id: string; imageUrl: string } => x != null && typeof x === "object" && typeof (x as { id: string }).id === "string")
        .map((x) => ({ id: String(x.id), imageUrl: String((x as { imageUrl?: string }).imageUrl ?? "") }))
    : [];
  if (fromConfig.length) return fromConfig;
  return layout
    .filter((el) => el.kind === "custom_image")
    .map((el) => ({ id: el.id, imageUrl: str(el.imageUrl, "") }))
    .filter((x) => x.imageUrl);
}

export function formStateFromBadgeBatch(batch: BadgeBatchRecord): BadgeFormState {
  const c = asConfig(batch);
  const bgColor = str(c.backgroundColor, "#0B4DD1");
  const bgImageUrl = str(c.backgroundImageUrl, "");
  const bgMode = bgImageUrl.trim() ? "image" : str(c.backgroundMode, "color") === "image" ? "image" : "color";
  const backgroundImageLayout =
    parseBackgroundImageLayout(c.backgroundImageLayout) ??
    (bgImageUrl.trim() ? defaultBackgroundImageLayout() : defaultBackgroundImageLayout());
  const fields = Array.isArray(c.fields) ? c.fields.map((f) => String(f)) : ["name", "title", "org", "qr"];
  let layoutElements = layoutFromConfig(c);
  if (!layoutElements.length && fields.length) {
    layoutElements = defaultLayoutForFields(fields, bgColor, bgMode);
  }
  const customTexts = customTextsFromConfig(c, layoutElements);
  const customImages = customImagesFromConfig(c, layoutElements);
  const scope = str(c.participantScope, "all") === "participant_list" ? "participant_list" : "all";
  const out = str(c.outputFormat, "pdf");
  const outputFormat: BadgeFormState["outputFormat"] =
    out === "png" || out === "jpeg" ? out : "pdf";

  return {
    formName: duplicateExportName(batch.name),
    formEventId: eventIdFromBatch(batch),
    sizePreset: sizePresetFromConfig(c),
    customW: numStr(c.widthMm, "105"),
    customH: numStr(c.heightMm, "148"),
    orientation: str(c.orientation, "portrait") === "landscape" ? "landscape" : "portrait",
    includeFaculty: bool(c.includeFaculty, true),
    includeParticipants: bool(c.includeParticipants, true),
    participantScope: scope,
    participantListId: c.participantListId != null ? String(c.participantListId) : "",
    backgroundMode: bgMode,
    backgroundColor: bgColor,
    backgroundImageUrl: bgImageUrl,
    backgroundImageLayout,
    enabledFields: fields,
    layoutElements,
    customTexts,
    customImages,
    outputFormat,
    badgeTypeLabel: str(c.badgeTypeLabel, "Attendee"),
  };
}