import type { SerializedProjectCommand } from "./project-command.model.js";

export const circuitDeviceRowUpdateCommandType =
  "circuit-device-row.update" as const;
export const circuitDeviceRowUpdateCommandSchemaVersion = 1 as const;

export interface CircuitDeviceRowUpdateValues {
  linkedProjectDeviceId: string | null;
  sortOrder: number;
  name: string;
  displayName: string;
  phaseType: string | null;
  connectionKind: string | null;
  costGroup: string | null;
  category: string | null;
  level: string | null;
  roomId: string | null;
  roomNumberSnapshot: string | null;
  roomNameSnapshot: string | null;
  quantity: number;
  manualQuantity: number;
  powerPerUnit: number;
  simultaneityFactor: number;
  cosPhi: number | null;
  remark: string | null;
  overriddenFields: string | null;
}

export type CircuitDeviceRowUpdateField = keyof CircuitDeviceRowUpdateValues;
export type CircuitDeviceRowUpdatePatch =
  Partial<CircuitDeviceRowUpdateValues>;

export interface CircuitDeviceRowUpdateFieldChange<
  TField extends CircuitDeviceRowUpdateField = CircuitDeviceRowUpdateField,
> {
  field: TField;
  value: CircuitDeviceRowUpdateValues[TField];
}

export interface CircuitDeviceRowUpdateCommandPayload {
  rowId: string;
  changes: CircuitDeviceRowUpdateFieldChange[];
}

export interface CircuitDeviceRowUpdateProjectCommand
  extends SerializedProjectCommand<CircuitDeviceRowUpdateCommandPayload> {
  schemaVersion: typeof circuitDeviceRowUpdateCommandSchemaVersion;
  type: typeof circuitDeviceRowUpdateCommandType;
}

export function createCircuitDeviceRowUpdateProjectCommand(
  rowId: string,
  patch: CircuitDeviceRowUpdatePatch
): CircuitDeviceRowUpdateProjectCommand {
  const normalizedPatch =
    patch.quantity !== undefined && patch.manualQuantity === undefined
      ? { ...patch, manualQuantity: patch.quantity }
      : patch;
  if (
    normalizedPatch.quantity !== undefined &&
    normalizedPatch.manualQuantity !== undefined &&
    normalizedPatch.manualQuantity > normalizedPatch.quantity
  ) {
    throw new Error("manualQuantity must not exceed quantity.");
  }
  const changes = Object.entries(normalizedPatch).map(([field, value]) => ({
    field: field as CircuitDeviceRowUpdateField,
    value,
  })) as CircuitDeviceRowUpdateFieldChange[];
  const command: CircuitDeviceRowUpdateProjectCommand = {
    schemaVersion: circuitDeviceRowUpdateCommandSchemaVersion,
    type: circuitDeviceRowUpdateCommandType,
    payload: { rowId, changes },
  };
  assertCircuitDeviceRowUpdateProjectCommand(command);
  return command;
}

export function assertCircuitDeviceRowUpdateProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is CircuitDeviceRowUpdateProjectCommand {
  if (
    command.schemaVersion !== circuitDeviceRowUpdateCommandSchemaVersion ||
    command.type !== circuitDeviceRowUpdateCommandType
  ) {
    throw new Error("Unsupported circuit device-row update command.");
  }
  if (!isPlainObject(command.payload)) {
    throw new Error("Circuit device-row update payload must be an object.");
  }
  const rowId = command.payload.rowId;
  const changes = command.payload.changes;
  if (typeof rowId !== "string" || !rowId.trim()) {
    throw new Error("Circuit device-row update command requires a row id.");
  }
  if (!Array.isArray(changes) || changes.length === 0) {
    throw new Error(
      "Circuit device-row update command requires at least one change."
    );
  }

  const seenFields = new Set<string>();
  for (const change of changes) {
    if (!isPlainObject(change) || typeof change.field !== "string") {
      throw new Error(
        "Circuit device-row update command contains an invalid change."
      );
    }
    if (
      !isCircuitDeviceRowUpdateField(change.field) ||
      seenFields.has(change.field)
    ) {
      throw new Error(
        "Circuit device-row update command contains an invalid or duplicate field."
      );
    }
    assertCircuitDeviceRowUpdateFieldValue(change.field, change.value);
    seenFields.add(change.field);
  }
}

function assertCircuitDeviceRowUpdateFieldValue(
  field: CircuitDeviceRowUpdateField,
  value: unknown
) {
  if (field === "name" || field === "displayName") {
    if (typeof value !== "string" || !value.trim()) {
      throw new Error(`${field} must be a non-empty string.`);
    }
    return;
  }
  if (field === "sortOrder") {
    if (typeof value !== "number" || !Number.isFinite(value)) {
      throw new Error("sortOrder must be a finite number.");
    }
    return;
  }
  if (
    field === "quantity" ||
    field === "manualQuantity" ||
    field === "powerPerUnit" ||
    field === "simultaneityFactor"
  ) {
    if (typeof value !== "number" || !Number.isFinite(value) || value < 0) {
      throw new Error(`${field} must be a non-negative finite number.`);
    }
    if (field === "simultaneityFactor" && value > 1) {
      throw new Error("simultaneityFactor must not exceed 1.");
    }
    return;
  }
  if (field === "cosPhi") {
    if (
      value !== null &&
      (typeof value !== "number" || !Number.isFinite(value) || value <= 0)
    ) {
      throw new Error("cosPhi must be a positive finite number or null.");
    }
    return;
  }
  if (value !== null && typeof value !== "string") {
    throw new Error(`${field} must be a string or null.`);
  }
}

function isCircuitDeviceRowUpdateField(
  value: string
): value is CircuitDeviceRowUpdateField {
  return [
    "linkedProjectDeviceId",
    "sortOrder",
    "name",
    "displayName",
    "phaseType",
    "connectionKind",
    "costGroup",
    "category",
    "level",
    "roomId",
    "roomNumberSnapshot",
    "roomNameSnapshot",
    "quantity",
    "manualQuantity",
    "powerPerUnit",
    "simultaneityFactor",
    "cosPhi",
    "remark",
    "overriddenFields",
  ].includes(value);
}

function isPlainObject(value: unknown): value is Record<string, unknown> {
  return value !== null && typeof value === "object" && !Array.isArray(value);
}