declare global {
  var Labels: LabelsModule;
}

// --- Types ---

export interface StateLabelData {
  i: number;
  type: "state";
  stateId: number;
  text: string;
  pathPoints: [number, number][];
  startOffset: number;
  fontSize: number;
  letterSpacing: number;
  transform: string;
}

export interface BurgLabelData {
  i: number;
  type: "burg";
  burgId: number;
  group: string;
  text: string;
  x: number;
  y: number;
  dx: number;
  dy: number;
}

export interface CustomLabelData {
  i: number;
  type: "custom";
  group: string;
  text: string;
  pathPoints: [number, number][];
  startOffset: number;
  fontSize: number;
  letterSpacing: number;
  transform: string;
}

export type LabelData = StateLabelData | BurgLabelData | CustomLabelData;

// --- Implementation ---

class LabelsModule {
  private getNextId(): number {
    const labels = pack.labels;
    if (labels.length === 0) return 0;

    const existingIds = labels.map((l) => l.i).sort((a, b) => a - b);
    for (let id = 0; id < existingIds[existingIds.length - 1]; id++) {
      if (!existingIds.includes(id)) return id;
    }
    return existingIds[existingIds.length - 1] + 1;
  }

  getAll(): LabelData[] {
    return pack.labels;
  }

  get(id: number): LabelData | undefined {
    return pack.labels.find((l) => l.i === id);
  }

  getByType(type: LabelData["type"]): LabelData[] {
    return pack.labels.filter((l) => l.type === type);
  }

  getByGroup(group: string): LabelData[] {
    return pack.labels.filter(
      (l) => (l.type === "burg" || l.type === "custom") && l.group === group,
    );
  }

  getStateLabel(stateId: number): StateLabelData | undefined {
    return pack.labels.find(
      (l) => l.type === "state" && l.stateId === stateId,
    ) as StateLabelData | undefined;
  }

  getBurgLabel(burgId: number): BurgLabelData | undefined {
    return pack.labels.find(
      (l) => l.type === "burg" && l.burgId === burgId,
    ) as BurgLabelData | undefined;
  }

  addStateLabel(
    data: Omit<StateLabelData, "i" | "type">,
  ): StateLabelData {
    const label: StateLabelData = { i: this.getNextId(), type: "state", ...data };
    pack.labels.push(label);
    return label;
  }

  addBurgLabel(data: Omit<BurgLabelData, "i" | "type">): BurgLabelData {
    const label: BurgLabelData = { i: this.getNextId(), type: "burg", ...data };
    pack.labels.push(label);
    return label;
  }

  addCustomLabel(
    data: Omit<CustomLabelData, "i" | "type">,
  ): CustomLabelData {
    const label: CustomLabelData = { i: this.getNextId(), type: "custom", ...data };
    pack.labels.push(label);
    return label;
  }

  updateLabel(id: number, updates: Partial<LabelData>): void {
    const label = pack.labels.find((l) => l.i === id);
    if (!label) return;
    Object.assign(label, updates, { i: label.i, type: label.type });
  }

  removeLabel(id: number): void {
    const index = pack.labels.findIndex((l) => l.i === id);
    if (index !== -1) pack.labels.splice(index, 1);
  }

  removeByType(type: LabelData["type"]): void {
    pack.labels = pack.labels.filter((l) => l.type !== type);
  }

  removeByGroup(group: string): void {
    pack.labels = pack.labels.filter(
      (l) =>
        !((l.type === "burg" || l.type === "custom") && l.group === group),
    );
  }

  removeStateLabel(stateId: number): void {
    const index = pack.labels.findIndex(
      (l) => l.type === "state" && l.stateId === stateId,
    );
    if (index !== -1) pack.labels.splice(index, 1);
  }

  removeBurgLabel(burgId: number): void {
    const index = pack.labels.findIndex(
      (l) => l.type === "burg" && l.burgId === burgId,
    );
    if (index !== -1) pack.labels.splice(index, 1);
  }

  clear(): void {
    pack.labels = [];
  }
}

window.Labels = new LabelsModule();