/**
 * AP1.9d — Methoden-Default-UI (DEPRECATED AP2.3b — Fallback bis Resolver live).
 * Bevorzugt: GET /api/initiatives/:id/operating-context + resolveOperatingProfile.js
 *
 * @typedef {{ key: string, to: string, label: string, mode: 'plan'|'work'|'control' }} ProcessStep
 * @typedef {{
 *   archetypeKey: string | null,
 *   methodKey: string | null,
 *   hasActiveSprint: boolean,
 * }} MethodUiInput
 * @typedef {{
 *   processSteps: ProcessStep[],
 *   planDefaultRoute: string,
 *   workDefaultRoute: string,
 *   controlDefaultRoute: string,
 *   planOutlineKeys: string[] | null,
 *   workNavKeys: string[] | null,
 * }} MethodUiDefaults
 */

import { PLAN_OUTLINE_NODES } from '../plan/planOutlineNodes.js'
import { WORK_NAV_ITEMS } from './workNav.js'

const PRODUCT_PROCESS = [
  { key: 'inbox', to: '/plan/inbox', label: 'Eingang', mode: 'plan' },
  { key: 'sprint-plan', to: '/plan/sprint', label: 'Sprint planen', mode: 'plan' },
  { key: 'sprint-work', to: '/work/sprint', label: 'Ausführen', mode: 'work' },
  { key: 'control', to: '/control/status', label: 'Kontrolle', mode: 'control' },
]

const LINEAR_PROCESS = [
  { key: 'gates', to: '/plan/gates', label: 'Zielzustände', mode: 'plan' },
  { key: 'work', to: '/work/today', label: 'Ausführen', mode: 'work' },
  { key: 'control', to: '/control/status', label: 'Kontrolle', mode: 'control' },
]

const MATURITY_PROCESS = [
  { key: 'gates', to: '/plan/gates', label: 'Stufen', mode: 'plan' },
  { key: 'journey', to: '/control/journey', label: 'Rhythmen', mode: 'control' },
  { key: 'work', to: '/work/today', label: 'Ausführen', mode: 'work' },
  { key: 'control', to: '/control/status', label: 'Kontrolle', mode: 'control' },
]

const PROGRAM_PROCESS = [
  { key: 'gates', to: '/plan/gates', label: 'Phasen', mode: 'plan' },
  { key: 'inbox', to: '/plan/inbox', label: 'Eingang', mode: 'plan' },
  { key: 'work', to: '/work/today', label: 'Ausführen', mode: 'work' },
  { key: 'control', to: '/control/status', label: 'Kontrolle', mode: 'control' },
]

const ARCHETYPE_UI = {
  'initiative.product': {
    processSteps: PRODUCT_PROCESS,
    planDefaultRoute: '/plan/inbox',
    workDefaultRoute: '/work/sprint',
    controlDefaultRoute: '/control/status',
    planOutlineKeys: ['profile', 'inbox', 'work', 'sprint', 'gates'],
    workNavKeys: ['sprint', 'today', 'mine'],
  },
  'initiative.linear_project': {
    processSteps: LINEAR_PROCESS,
    planDefaultRoute: '/plan/gates',
    workDefaultRoute: '/work/today',
    controlDefaultRoute: '/control/status',
    planOutlineKeys: ['profile', 'structure', 'gates', 'inbox', 'work'],
    workNavKeys: ['today', 'mine', 'sprint'],
  },
  'initiative.maturity_journey': {
    processSteps: MATURITY_PROCESS,
    planDefaultRoute: '/plan/gates',
    workDefaultRoute: '/work/today',
    controlDefaultRoute: '/control/status',
    planOutlineKeys: ['profile', 'gates', 'work'],
    workNavKeys: ['today', 'mine', 'sprint'],
  },
  'initiative.program': {
    processSteps: PROGRAM_PROCESS,
    planDefaultRoute: '/plan/gates',
    workDefaultRoute: '/work/today',
    controlDefaultRoute: '/control/status',
    planOutlineKeys: ['profile', 'structure', 'gates', 'inbox', 'sprint', 'work'],
    workNavKeys: ['today', 'mine', 'sprint'],
  },
}

const FALLBACK_DEFAULTS = {
  processSteps: [],
  planDefaultRoute: '/plan/profile',
  workDefaultRoute: '/work/today',
  controlDefaultRoute: '/control/status',
  planOutlineKeys: null,
  workNavKeys: null,
}

/**
 * @param {MethodUiInput} input
 * @returns {MethodUiDefaults}
 */
export function resolveMethodUiDefaults(input = {}) {
  const archetypeKey = input.archetypeKey || null
  const base = ARCHETYPE_UI[archetypeKey] || FALLBACK_DEFAULTS

  let workDefaultRoute = base.workDefaultRoute
  if (archetypeKey === 'initiative.product' && !input.hasActiveSprint) {
    workDefaultRoute = '/work/today'
  }

  return {
    processSteps: base.processSteps,
    planDefaultRoute: base.planDefaultRoute,
    workDefaultRoute,
    controlDefaultRoute: base.controlDefaultRoute,
    planOutlineKeys: base.planOutlineKeys,
    workNavKeys: base.workNavKeys,
  }
}

/**
 * @param {MethodUiInput} input
 * @returns {ProcessStep[]}
 */
export function resolveProcessSteps(input = {}) {
  return resolveMethodUiDefaults(input).processSteps
}

/**
 * @param {MethodUiInput} input
 * @returns {typeof PLAN_OUTLINE_NODES}
 */
export function resolvePlanOutlineNodes(input = {}) {
  const { planOutlineKeys } = resolveMethodUiDefaults(input)
  if (!planOutlineKeys) return PLAN_OUTLINE_NODES
  const order = new Map(planOutlineKeys.map((key, index) => [key, index]))
  return PLAN_OUTLINE_NODES.filter((node) => order.has(node.key)).sort(
    (a, b) => (order.get(a.key) ?? 0) - (order.get(b.key) ?? 0),
  )
}

/**
 * @param {MethodUiInput} input
 * @returns {typeof WORK_NAV_ITEMS}
 */
export function resolveWorkNavItems(input = {}) {
  const { workNavKeys } = resolveMethodUiDefaults(input)
  if (!workNavKeys) return WORK_NAV_ITEMS
  const order = new Map(workNavKeys.map((key, index) => [key, index]))
  return WORK_NAV_ITEMS.filter((item) => order.has(item.key)).sort(
    (a, b) => (order.get(a.key) ?? 0) - (order.get(b.key) ?? 0),
  )
}

/**
 * Aktiven Prozessschritt aus Modus + Pfad ableiten.
 * @param {string} pathname
 * @param {ProcessStep[]} steps
 */
export function resolveActiveProcessStepKey(pathname, steps) {
  const path = (pathname || '').replace(/\/$/, '') || pathname
  if (!steps.length) return null

  if (path.startsWith('/control/')) {
    const journey = steps.find((s) => s.key === 'journey')
    if (journey && path.startsWith('/control/journey')) return 'journey'
    return steps.find((s) => s.mode === 'control')?.key ?? null
  }
  if (path.startsWith('/work/')) {
    if (path.startsWith('/work/sprint')) {
      return steps.find((s) => s.key === 'sprint-work')?.key ?? null
    }
    return steps.find((s) => s.key === 'work')?.key ?? null
  }
  if (path.startsWith('/plan/')) {
    if (path.startsWith('/plan/inbox')) return 'inbox'
    if (path.startsWith('/plan/sprint')) return 'sprint-plan'
    if (path.startsWith('/plan/gates')) return 'gates'
  }
  if (path.startsWith('/actions/')) {
    return steps.find((s) => s.mode === 'work')?.key ?? null
  }

  return null
}