export type TemplateId =
  | "t54w-door-unlock"
  | "t54w-door-unlock-with-sp"
  | "t57w-door-unlock-with-sp"
  | "t58w-door-unlock";

export interface SharedParkingSlot {
  readonly blfNo: number;
  readonly value: string;
}

export interface SlotContract {
  readonly reserved: readonly number[];
  readonly sharedParking: readonly SharedParkingSlot[];
  readonly ownLine: number;
  readonly managedStart: number;
  readonly managedEnd: number;
}

export const SLOT_CONTRACT: Record<TemplateId, SlotContract> = {
  "t54w-door-unlock": {
    reserved: [2],
    sharedParking: [],
    ownLine: 1,
    managedStart: 3,
    managedEnd: 12,
  },
  "t54w-door-unlock-with-sp": {
    reserved: [2],
    sharedParking: [
      { blfNo: 3, value: "SP1" },
      { blfNo: 4, value: "SP2" },
      { blfNo: 5, value: "SP3" },
    ],
    ownLine: 1,
    managedStart: 6,
    managedEnd: 15,
  },
  "t57w-door-unlock-with-sp": {
    reserved: [2],
    sharedParking: [
      { blfNo: 3, value: "SP1" },
      { blfNo: 4, value: "SP2" },
      { blfNo: 5, value: "SP3" },
    ],
    ownLine: 1,
    managedStart: 6,
    managedEnd: 15,
  },
  "t58w-door-unlock": {
    reserved: [2, 3, 4],
    sharedParking: [],
    ownLine: 1,
    managedStart: 5,
    managedEnd: 14,
  },
};

const TEMPLATE_MATCHERS: { id: TemplateId; needle: string }[] = [
  { id: "t57w-door-unlock-with-sp", needle: "yealinkT57W-door-unlock-with-sp" },
  { id: "t54w-door-unlock-with-sp", needle: "yealinkT54W-door-unlock-with-sp" },
  { id: "t54w-door-unlock", needle: "yealinkT54W-door-unlock" },
  { id: "t58w-door-unlock", needle: "yealinkT58W-door-unlock" },
];

export function resolveTemplateId(...candidates: Array<string | undefined | null>): TemplateId | undefined {
  const haystack = candidates.filter(Boolean).join(" ");
  if (!haystack) {
    return undefined;
  }
  for (const matcher of TEMPLATE_MATCHERS) {
    if (haystack.includes(matcher.needle)) {
      return matcher.id;
    }
  }
  return undefined;
}

export function isManagedSlot(contract: SlotContract, blfNo: number): boolean {
  return blfNo >= contract.managedStart && blfNo <= contract.managedEnd;
}

export function isReservedSlot(contract: SlotContract, blfNo: number): boolean {
  return contract.reserved.includes(blfNo);
}

export function isSharedParkingSlot(contract: SlotContract, blfNo: number): boolean {
  return contract.sharedParking.some((slot) => slot.blfNo === blfNo);
}

export function managedSlotCount(contract: SlotContract): number {
  return contract.managedEnd - contract.managedStart + 1;
}