// driver registry — hardcoded list of known drivers plus lookup helpers.
// kept intentionally flat: no DI, no plugin discovery, no lazy imports. both
// built-in drivers load unconditionally because their module bodies are cheap
// (no I/O, no side effects).

import { electronDriver } from './electron'
import { playwrightDriver } from './playwright'
import type { Driver, DriverId } from './types'

export const ALL_DRIVERS: readonly Driver[] = [electronDriver, playwrightDriver]

export function getAllDrivers(): readonly Driver[] {
  return ALL_DRIVERS
}

export function getDriver(id: DriverId): Driver | null {
  return ALL_DRIVERS.find((d) => d.id === id) ?? null
}

// returns the first driver in preference order that reports availability.
// used by launch sites that want "pick whatever works" behavior when the
// user didn't pass an explicit --driver flag. if `forcedId` is given, that
// driver is returned even if unavailable so the caller can surface a
// specific error message rather than silently falling back.
export function resolveDriver(
  forcedId: string | null | undefined,
  preference: readonly DriverId[],
): Driver | null {
  if (forcedId) {
    const match = ALL_DRIVERS.find((d) => d.id === forcedId)
    return match ?? null
  }
  for (const id of preference) {
    const driver = ALL_DRIVERS.find((d) => d.id === id)
    if (driver && driver.availability().available) return driver
  }
  return null
}

// utility for the `rnx list --drivers` view. returns a rich row per
// driver with availability + kind + description, suitable for a table.
export interface DriverListRow {
  id: DriverId
  name: string
  kind: Driver['kind']
  description: string
  available: boolean
  reason: string | null
  detail: string | null
}

export function buildDriverListRows(): DriverListRow[] {
  return ALL_DRIVERS.map((d) => {
    const probe = d.availability()
    return {
      id: d.id,
      name: d.name,
      kind: d.kind,
      description: d.description,
      available: probe.available,
      reason: probe.reason,
      detail: probe.detail ?? null,
    }
  })
}