import type { SerializedProjectCommand } from "./project-command.model.js";
import {
  distributionBoardSupplyTypes,
  type DistributionBoardSupplyType,
} from "../../shared/constants/distribution-board.js";
import {
  projectCoverFieldMaxLengths,
  projectCoverFields,
  type ProjectCoverField,
} from "../../shared/constants/project-cover.js";

export const projectSettingsUpdateCommandType =
  "project.update-settings" as const;
// Version 3 adds the print cover fields. Versions 2 (without cover fields)
// and 1 (additionally without the public-building flag) stay executable;
// their missing values keep the current project values.
export const projectSettingsUpdateCommandSchemaVersion = 3 as const;
export const withoutCoverProjectSettingsUpdateCommandSchemaVersion = 2 as const;
export const baselineProjectSettingsUpdateCommandSchemaVersion = 1 as const;

export interface ProjectSettingsValues
  extends Record<ProjectCoverField, string | null> {
  name: string;
  internalProjectNumber: string | null;
  externalProjectNumber: string | null;
  buildingOwner: string | null;
  description: string | null;
  isPublicBuilding: boolean;
  singlePhaseVoltageV: number;
  threePhaseVoltageV: number;
  enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
}

export type WithoutCoverProjectSettingsValues = Omit<
  ProjectSettingsValues,
  ProjectCoverField
>;

export type BaselineProjectSettingsValues = Omit<
  WithoutCoverProjectSettingsValues,
  "isPublicBuilding"
>;

export interface CurrentProjectSettingsUpdateProjectCommand
  extends SerializedProjectCommand<ProjectSettingsValues> {
  schemaVersion: typeof projectSettingsUpdateCommandSchemaVersion;
  type: typeof projectSettingsUpdateCommandType;
}

export interface WithoutCoverProjectSettingsUpdateProjectCommand
  extends SerializedProjectCommand<WithoutCoverProjectSettingsValues> {
  schemaVersion: typeof withoutCoverProjectSettingsUpdateCommandSchemaVersion;
  type: typeof projectSettingsUpdateCommandType;
}

export interface BaselineProjectSettingsUpdateProjectCommand
  extends SerializedProjectCommand<BaselineProjectSettingsValues> {
  schemaVersion: typeof baselineProjectSettingsUpdateCommandSchemaVersion;
  type: typeof projectSettingsUpdateCommandType;
}

export type ProjectSettingsUpdateProjectCommand =
  | CurrentProjectSettingsUpdateProjectCommand
  | WithoutCoverProjectSettingsUpdateProjectCommand
  | BaselineProjectSettingsUpdateProjectCommand;

export function createProjectSettingsUpdateProjectCommand(
  values: ProjectSettingsValues
): CurrentProjectSettingsUpdateProjectCommand {
  const command: CurrentProjectSettingsUpdateProjectCommand = {
    schemaVersion: projectSettingsUpdateCommandSchemaVersion,
    type: projectSettingsUpdateCommandType,
    payload: { ...values },
  };
  assertProjectSettingsUpdateProjectCommand(command);
  return command;
}

export function assertProjectSettingsUpdateProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectSettingsUpdateProjectCommand {
  if (
    command.type !== projectSettingsUpdateCommandType ||
    (command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion &&
      command.schemaVersion !==
        withoutCoverProjectSettingsUpdateCommandSchemaVersion &&
      command.schemaVersion !==
        baselineProjectSettingsUpdateCommandSchemaVersion)
  ) {
    throw new Error("Unsupported project settings update command.");
  }
  if (!isPlainObject(command.payload)) {
    throw new Error(
      "Project settings update command contains invalid values."
    );
  }
  if (
    !isTrimmedString(command.payload.name, 1, 200) ||
    !isNullableTrimmedString(command.payload.internalProjectNumber, 100) ||
    !isNullableTrimmedString(command.payload.externalProjectNumber, 100) ||
    !isNullableTrimmedString(command.payload.buildingOwner, 200) ||
    !isNullableTrimmedString(command.payload.description, 2000) ||
    !isPositiveFiniteNumber(command.payload.singlePhaseVoltageV) ||
    !isPositiveFiniteNumber(command.payload.threePhaseVoltageV)
  ) {
    throw new Error(
      "Project settings update command contains invalid values."
    );
  }
  if (
    !isValidSupplyTypes(
      command.payload.enabledDistributionBoardSupplyTypes
    )
  ) {
    throw new Error(
      "Project settings update command contains invalid supply types."
    );
  }
  const payload = command.payload;
  const expectedKeyCount =
    command.schemaVersion === baselineProjectSettingsUpdateCommandSchemaVersion
      ? 8
      : command.schemaVersion ===
          withoutCoverProjectSettingsUpdateCommandSchemaVersion
        ? 9
        : 9 + projectCoverFields.length;
  if (
    Object.keys(payload).length !== expectedKeyCount ||
    (command.schemaVersion !==
      baselineProjectSettingsUpdateCommandSchemaVersion &&
      typeof payload.isPublicBuilding !== "boolean") ||
    (command.schemaVersion === projectSettingsUpdateCommandSchemaVersion &&
      !projectCoverFields.every((field) =>
        isNullableTrimmedString(payload[field], projectCoverFieldMaxLengths[field])
      ))
  ) {
    throw new Error(
      "Project settings update command contains invalid values."
    );
  }
}

function isValidSupplyTypes(
  value: unknown
): value is DistributionBoardSupplyType[] {
  return (
    Array.isArray(value) &&
    value.length > 0 &&
    new Set(value).size === value.length &&
    value.every(
      (entry) =>
        typeof entry === "string" &&
        distributionBoardSupplyTypes.includes(
          entry as DistributionBoardSupplyType
        )
    )
  );
}

function isPositiveFiniteNumber(value: unknown): value is number {
  return (
    typeof value === "number" &&
    Number.isFinite(value) &&
    value > 0
  );
}

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

function isTrimmedString(
  value: unknown,
  minimumLength: number,
  maximumLength: number
): value is string {
  return (
    typeof value === "string" &&
    value === value.trim() &&
    value.length >= minimumLength &&
    value.length <= maximumLength
  );
}

function isNullableTrimmedString(
  value: unknown,
  maximumLength: number
): value is string | null {
  return (
    value === null ||
    (isTrimmedString(value, 1, maximumLength))
  );
}