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import {  DEFAULT_LEVEL,  DEFAULT_MERGE_BINDINGS,  DEFAULT_MERGE_PAYLOAD,  DEFAULT_TIME,  DEFAULT_USE_LABELS} from "./constants.ts";import { Level } from "./level.enum.ts";
import type { Formatter } from "./formatter.interface.ts";import type { Internals } from "./internals.interface.ts";import type { Papyrus } from "./papyrus.ts";import type { PapyrusOptions } from "./papyrus_options.interface.ts";import { KeyValuePair, levelToNum, numToLevel } from "./utils.ts";import type { TransportOptions } from "./transport.interface.ts";
export class Configuration {  private static readonly names: string[] = []
  private readonly internals: Internals;
  constructor(options: PapyrusOptions, private parent?: Papyrus) {    this.internals = this.computeInternals(options);  }
  /** Return computed internal options */  private computeInternals(options: PapyrusOptions): Internals {    return {      bindings: options.bindings || {},      enabled: typeof options.enabled === "boolean" ? options.enabled : true,      formatter: options.formatter,      level: this.validateLevel(options.level),      mergeBindings: typeof options.mergeBindings === "boolean" ? options.mergeBindings : DEFAULT_MERGE_BINDINGS,      mergePayload: typeof options.mergePayload === "boolean" ? options.mergePayload : DEFAULT_MERGE_PAYLOAD,      name: this.validateName(options.name),      time: typeof options.time === "boolean" ? options.time : DEFAULT_TIME,      transport: Array.isArray(options.transport) ? options.transport : options.transport ? [options.transport] : [],      useLabels: typeof options.useLabels === "boolean" ? options.useLabels : DEFAULT_USE_LABELS,    }  }
  /** Returns a valid level as number */  private validateLevel(level?: Level | keyof typeof Level): Level {    if(level && typeof level !== "number" && levelToNum(level)) {      return Level[level];    } else if(      typeof level === "number" && numToLevel(level)      ) {      return level;    }     return DEFAULT_LEVEL;  }
  /** Throws an error if the name is not unique, or if a child logger doesn't have a name */  private validateName(name: string | undefined): string | undefined {    if(!name && !this.isChild) {      return;    } else if(!name) {      throw new Error("A child logger must have a name");    } else if(Configuration.names.includes(name)) {      throw new Error(`Only one logger can be named ${name}`);    }    Configuration.names.push(name);    return name;  }
  public get bindings(): KeyValuePair {    const bindings = this.internals.bindings || {}    return Object.assign({}, this.parent?.bindings, bindings);  }
  public get enabled(): boolean {    return this.internals.enabled;  }
  public get formatter(): Formatter | undefined {    return this.internals.formatter;  }
  public get level(): Level {    return this.internals.level;  }
  public get mergeBindings(): boolean {    return this.internals.mergeBindings;  }
  public get mergePayload(): boolean {    return this.internals.mergePayload;  }
  public get name(): string | undefined {    return this.internals.name;  }
  public get useLabels(): boolean {    return this.internals.useLabels;  }
  public get time(): boolean {    return this.internals.time;  }
  public get transport(): TransportOptions[] {    return this.internals.transport;  }
  private get isChild(): boolean {    return this.parent ? true : false;  }
}