import {
  assertCircuitDeviceRowInsertProjectCommand,
  circuitDeviceRowInsertCommandType,
  circuitDeviceRowStructureCommandSchemaVersion,
  type CircuitDeviceRowSnapshot,
} from "./circuit-device-row-structure-project-command.model.js";
import {
  assertProjectDeviceUpdateProjectCommand,
  projectDeviceUpdateCommandSchemaVersion,
  projectDeviceUpdateCommandType,
  projectDeviceUpdateFields,
  type ProjectDeviceUpdateValues,
} from "./project-device-project-command.model.js";
import type { SerializedProjectCommand } from "./project-command.model.js";

export const projectDeviceInsertCommandType =
  "project-device.insert" as const;
export const projectDeviceDeleteCommandType =
  "project-device.delete" as const;
export const projectDeviceStructureCommandSchemaVersion = 1 as const;

export interface ProjectDeviceSnapshot
  extends ProjectDeviceUpdateValues {
  id: string;
  projectId: string;
}

export interface ProjectDeviceInsertCommandPayload {
  projectDevice: ProjectDeviceSnapshot;
  linkedRows: CircuitDeviceRowSnapshot[];
}

export interface ProjectDeviceDeleteCommandPayload {
  projectDeviceId: string;
  expectedProjectId: string;
}

export interface ProjectDeviceInsertProjectCommand
  extends SerializedProjectCommand<ProjectDeviceInsertCommandPayload> {
  schemaVersion: typeof projectDeviceStructureCommandSchemaVersion;
  type: typeof projectDeviceInsertCommandType;
}

export interface ProjectDeviceDeleteProjectCommand
  extends SerializedProjectCommand<ProjectDeviceDeleteCommandPayload> {
  schemaVersion: typeof projectDeviceStructureCommandSchemaVersion;
  type: typeof projectDeviceDeleteCommandType;
}

export type ProjectDeviceStructureProjectCommand =
  | ProjectDeviceInsertProjectCommand
  | ProjectDeviceDeleteProjectCommand;

export function createProjectDeviceInsertProjectCommand(
  projectDevice: ProjectDeviceSnapshot,
  linkedRows: CircuitDeviceRowSnapshot[] = []
): ProjectDeviceInsertProjectCommand {
  const command: ProjectDeviceInsertProjectCommand = {
    schemaVersion: projectDeviceStructureCommandSchemaVersion,
    type: projectDeviceInsertCommandType,
    payload: { projectDevice, linkedRows },
  };
  assertProjectDeviceInsertProjectCommand(command);
  return command;
}

export function createProjectDeviceDeleteProjectCommand(
  projectDeviceId: string,
  expectedProjectId: string
): ProjectDeviceDeleteProjectCommand {
  const command: ProjectDeviceDeleteProjectCommand = {
    schemaVersion: projectDeviceStructureCommandSchemaVersion,
    type: projectDeviceDeleteCommandType,
    payload: { projectDeviceId, expectedProjectId },
  };
  assertProjectDeviceDeleteProjectCommand(command);
  return command;
}

export function assertProjectDeviceInsertProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectDeviceInsertProjectCommand {
  if (
    command.schemaVersion !== projectDeviceStructureCommandSchemaVersion ||
    command.type !== projectDeviceInsertCommandType
  ) {
    throw new Error("Unsupported project-device insert command.");
  }
  if (!isPlainObject(command.payload)) {
    throw new Error("Project-device insert payload must be an object.");
  }
  const { projectDevice, linkedRows } = command.payload;
  if (!isPlainObject(projectDevice)) {
    throw new Error(
      "Project-device insert command requires a project device."
    );
  }
  assertNonEmptyString(projectDevice.id, "projectDevice.id");
  assertNonEmptyString(
    projectDevice.projectId,
    "projectDevice.projectId"
  );
  assertProjectDeviceUpdateProjectCommand({
    schemaVersion: projectDeviceUpdateCommandSchemaVersion,
    type: projectDeviceUpdateCommandType,
    payload: {
      projectDeviceId: projectDevice.id,
      changes: projectDeviceUpdateFields.map((field) => ({
        field,
        value: projectDevice[field],
      })),
    },
  });

  if (!Array.isArray(linkedRows)) {
    throw new Error(
      "Project-device insert linkedRows must be an array."
    );
  }
  const rowIds = new Set<string>();
  for (const row of linkedRows) {
    assertCircuitDeviceRowInsertProjectCommand({
      schemaVersion: circuitDeviceRowStructureCommandSchemaVersion,
      type: circuitDeviceRowInsertCommandType,
      payload: { row },
    });
    if (row.linkedProjectDeviceId !== null) {
      throw new Error(
        "Restored project-device rows must currently be disconnected."
      );
    }
    if (rowIds.has(row.id)) {
      throw new Error(
        "Project-device insert command contains duplicate row ids."
      );
    }
    rowIds.add(row.id);
  }
}

export function assertProjectDeviceDeleteProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectDeviceDeleteProjectCommand {
  if (
    command.schemaVersion !== projectDeviceStructureCommandSchemaVersion ||
    command.type !== projectDeviceDeleteCommandType
  ) {
    throw new Error("Unsupported project-device delete command.");
  }
  if (!isPlainObject(command.payload)) {
    throw new Error("Project-device delete payload must be an object.");
  }
  assertNonEmptyString(
    command.payload.projectDeviceId,
    "projectDeviceId"
  );
  assertNonEmptyString(
    command.payload.expectedProjectId,
    "expectedProjectId"
  );
}

function assertNonEmptyString(value: unknown, field: string) {
  if (typeof value !== "string" || !value.trim()) {
    throw new Error(`${field} must be a non-empty string.`);
  }
}

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