import { readFileSync, existsSync } from 'fs'
import path from 'path'
import { atomicWriteJSON } from './file-utils'
import { DEFAULT_HOURS } from './hours-config'
import type { HoursConfig } from './hours-config'

export type { DayHours, WeekHours, HoursConfig } from './hours-config'
export { DEFAULT_HOURS, minsToTime, timeToMins } from './hours-config'

const HOURS_PATH = path.join(process.cwd(), 'data', 'hours.json')

export function getHoursConfig(): HoursConfig {
  if (!existsSync(HOURS_PATH)) return DEFAULT_HOURS
  try {
    const saved = JSON.parse(readFileSync(HOURS_PATH, 'utf-8')) as Partial<HoursConfig>
    return {
      delivery:              { ...DEFAULT_HOURS.delivery, ...(saved.delivery ?? {}) },
      pickup:                { ...DEFAULT_HOURS.pickup,   ...(saved.pickup   ?? {}) },
      deliveryWindowMinutes: saved.deliveryWindowMinutes ?? DEFAULT_HOURS.deliveryWindowMinutes,
      leadTimeHours:         saved.leadTimeHours         ?? DEFAULT_HOURS.leadTimeHours,
    }
  } catch {
    return DEFAULT_HOURS
  }
}

export function saveHoursConfig(config: HoursConfig): void {
  atomicWriteJSON(HOURS_PATH, config)
}