// Global configuration and project defaults for Imhotep
// Uses dependency injection patterns: configure() sets runtime globals,
// project() sets persistent project-level metadata.

export interface ImhotepConfig {
  defaultTolerance?: { value: number; unit: 'px' | 'jnd' }
  defaultFrame?: string
  perceptualModel?: string
  [key: string]: unknown
}

let globalConfig: ImhotepConfig = {}

/** Sets or updates global Imhotep runtime configuration. */
export function configure(config: ImhotepConfig): void {
  globalConfig = { ...globalConfig, ...config }
}

/** Returns a shallow copy of the current global config. */
export function getConfig(): ImhotepConfig {
  return { ...globalConfig }
}

export interface ProjectConfig {
  name?: string
  fontCorpus?: string
  adapters?: string[]
  environments?: unknown[]
  [key: string]: unknown
}

let projectConfig: ProjectConfig = {}

/** Sets or updates project-level defaults, font corpora, and adapters. */
export function project(config: ProjectConfig): void {
  projectConfig = { ...projectConfig, ...config }
}

/** Returns a shallow copy of the current project config. */
export function getProjectConfig(): ProjectConfig {
  return { ...projectConfig }
}

/** Environment guard for responsive contracts.
 *  Only executes the callback when the condition is truthy.
 */
export function when(condition: unknown, fn: () => void): void {
  if (condition) {
    fn()
  }
}