// Bidirectionele case-mapper voor IdeaStatus + transitie-guard helper.
// DB houdt UPPER_SNAKE; API exposeert lowercase.
// Patroon volgt lib/task-status.ts.

import type { IdeaStatus } from '@prisma/client'

const IDEA_DB_TO_API = {
  DRAFT: 'draft',
  GRILLING: 'grilling',
  GRILL_FAILED: 'grill_failed',
  GRILLED: 'grilled',
  PLANNING: 'planning',
  PLAN_FAILED: 'plan_failed',
  PLAN_READY: 'plan_ready',
  PLANNED: 'planned',
} as const satisfies Record<IdeaStatus, string>

const IDEA_API_TO_DB: Record<string, IdeaStatus> = {
  draft: 'DRAFT',
  grilling: 'GRILLING',
  grill_failed: 'GRILL_FAILED',
  grilled: 'GRILLED',
  planning: 'PLANNING',
  plan_failed: 'PLAN_FAILED',
  plan_ready: 'PLAN_READY',
  planned: 'PLANNED',
}

export type IdeaStatusApi = (typeof IDEA_DB_TO_API)[IdeaStatus]

export function ideaStatusToApi(s: IdeaStatus): IdeaStatusApi {
  return IDEA_DB_TO_API[s]
}

export function ideaStatusFromApi(s: string): IdeaStatus | null {
  return IDEA_API_TO_DB[s.toLowerCase()] ?? null
}

export const IDEA_STATUS_API_VALUES = Object.values(IDEA_DB_TO_API)

// ---------------------------------------------------------------------------
// State-machine transition table (zie docs/plans/M12-ideas.md state-machine).
// Server-actions gebruiken canTransition(from, to) als guard vóór mutatie.
//
// Asymmetrisch: trek vanuit DRAFT alleen naar GRILLING; vanuit GRILLED kan
// re-grill (→ GRILLING) of make-plan (→ PLANNING) gebeuren. PLANNED is een
// terminal state; verlaat alleen via expliciete relink (PBI verwijderd → PLAN_READY).

const ALLOWED_TRANSITIONS: Record<IdeaStatus, ReadonlyArray<IdeaStatus>> = {
  DRAFT: ['GRILLING'],
  GRILLING: ['GRILLED', 'GRILL_FAILED'],
  GRILL_FAILED: ['GRILLING', 'DRAFT'],
  GRILLED: ['GRILLING', 'PLANNING'],
  PLANNING: ['PLAN_READY', 'PLAN_FAILED'],
  PLAN_FAILED: ['PLANNING', 'GRILLED'],
  PLAN_READY: ['PLANNING', 'PLANNED', 'GRILLING'], // GRILLING via startGrillJobAction (re-grill)
  PLANNED: ['PLAN_READY', 'GRILLING'], // PLAN_READY via relinkIdeaPlanAction; GRILLING via startGrillJobAction
}

export function canTransition(from: IdeaStatus, to: IdeaStatus): boolean {
  return ALLOWED_TRANSITIONS[from].includes(to)
}

// Statussen waarin een idee bewerkbaar is (form-input, niet md-velden).
const EDITABLE_STATUSES: ReadonlyArray<IdeaStatus> = [
  'DRAFT',
  'GRILL_FAILED',
  'GRILLED',
  'PLAN_FAILED',
  'PLAN_READY',
]

export function isIdeaEditable(s: IdeaStatus): boolean {
  return EDITABLE_STATUSES.includes(s)
}

// Statussen waarin grill_md bewerkbaar is (handmatige finetuning).
export function isGrillMdEditable(s: IdeaStatus): boolean {
  return s === 'GRILLED' || s === 'PLAN_READY'
}

// Statussen waarin plan_md bewerkbaar is.
export function isPlanMdEditable(s: IdeaStatus): boolean {
  return s === 'PLAN_READY'
}