import { readFileSync, existsSync } from 'fs'
import path from 'path'
import { atomicWriteJSON } from './file-utils'

export interface ItemOverride {
  hidden?: boolean
  categoryOverride?: string
  categoryLabelOverride?: string
  sortOrder?: number
  showColors?: boolean
  hiddenModifierIds?: string[]
  hiddenVariationIds?: string[]
  descriptionOverride?: string
  /** Per-modifier minimum selections override. Key = modifier list ID, value = min count. */
  modifierMinSelected?: Record<string, number>
  /** Minimum latex colors the customer must pick (default 1 when showColors=true). */
  colorMin?: number
  /** Maximum latex colors the customer can pick (null = unlimited). */
  colorMax?: number
  /** Extra charge in cents added per chrome color selected (0 = no per-color surcharge). */
  chromeSurchargePerColor?: number
  /** Unit label for the quantity field, e.g. "ft". When set, the quantity control shows "X ft". */
  quantityUnit?: string
}

export type OverridesMap = Record<string, ItemOverride>

const OVERRIDES_PATH = path.join(process.cwd(), 'data', 'item-overrides.json')

export function readOverrides(): OverridesMap {
  if (!existsSync(OVERRIDES_PATH)) return {}
  try {
    return JSON.parse(readFileSync(OVERRIDES_PATH, 'utf-8'))
  } catch {
    return {}
  }
}

export function writeOverrides(overrides: OverridesMap): void {
  atomicWriteJSON(OVERRIDES_PATH, overrides)
}

export function setOverride(itemId: string, patch: Partial<ItemOverride>): void {
  const all = readOverrides()
  all[itemId] = { ...(all[itemId] ?? {}), ...patch }
  writeOverrides(all)
}

export function clearOverride(itemId: string): void {
  const all = readOverrides()
  delete all[itemId]
  writeOverrides(all)
}