/**
 * AP2.3b/f / AP2.4 — Operating Profile Resolver (API-first, methodUiDefaults nur als Fallback).
 */
import { PLAN_OUTLINE_NODES } from '../plan/planOutlineNodes.js'
import { WORK_NAV_ITEMS } from '../config/workNav.js'
import {
  resolveMethodUiDefaults,
  resolveActiveProcessStepKey as resolveActiveProcessStepKeyFallback,
} from '../config/methodUiDefaults.js'
import {
  isRouteAllowedForMode,
  resolveRedirectForModeRoute,
} from './modeRouteRegistry.js'

/**
 * @typedef {import('../config/methodUiDefaults.js').ProcessStep} ProcessStep
 * @typedef {import('../config/methodUiDefaults.js').MethodUiDefaults} MethodUiDefaults
 * @typedef {{
 *   initiative_id?: string,
 *   archetype_key?: string | null,
 *   method_key?: string | null,
 *   method_profile_key?: string | null,
 *   ui_profile?: Partial<MethodUiDefaults & { workDefaultRouteWithoutActiveWorkCycle?: string }> | null,
 *   data_slices?: string[],
 *   om_capabilities?: string[],
 *   method_capabilities?: object,
 *   steering_elements?: string[],
 *   ui_features?: Record<string, boolean>,
 *   graph_profile?: { enforce_gate_blocking?: boolean, emphasize_fulfillment?: boolean },
 *   compatible_methods?: object[],
 * }} OperatingContextResponse
 * @typedef {{
 *   archetypeKey?: string | null,
 *   methodKey?: string | null,
 *   hasActiveSprint?: boolean,
 *   operatingContext?: OperatingContextResponse | null,
 * }} ResolveOperatingProfileInput
 */

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

/**
 * API data_slices haben Vorrang; leeres Array gilt als „fehlend“ (JS-Truthy-Falle).
 * @param {OperatingContextResponse | null | undefined} context
 * @returns {string[]}
 */
export function resolveEffectiveDataSlices(context) {
  const apiSlices = context?.data_slices
  if (Array.isArray(apiSlices) && apiSlices.length > 0) {
    return apiSlices
  }
  const profileSlices = context?.ui_profile?.dataSlices
  if (Array.isArray(profileSlices) && profileSlices.length > 0) {
    return profileSlices
  }
  return Array.isArray(apiSlices) ? apiSlices : []
}

function resolveUiFeatures(context, profileFeatures) {
  if (context?.ui_features && Object.keys(context.ui_features).length) {
    return { ...(context.ui_features || {}) }
  }
  return { ...(profileFeatures || {}) }
}

function resolveSteeringElements(context) {
  if (Array.isArray(context?.steering_elements)) {
    return [...context.steering_elements]
  }
  return []
}

function resolveWorkDefaultRoute(profile, options = {}) {
  const base = profile.workDefaultRoute || EMPTY_PROFILE.workDefaultRoute
  if (!options.hasActiveSprint && profile.workDefaultRouteWithoutActiveWorkCycle) {
    return profile.workDefaultRouteWithoutActiveWorkCycle
  }
  return base
}

/**
 * @param {OperatingContextResponse | null | undefined} context
 * @param {{ hasActiveSprint?: boolean }} [options]
 */
export function resolveOperatingProfile(context, options = {}) {
  if (context?.ui_profile) {
    const profile = context.ui_profile
    return {
      processSteps: profile.processSteps || [],
      planDefaultRoute: profile.planDefaultRoute || EMPTY_PROFILE.planDefaultRoute,
      workDefaultRoute: resolveWorkDefaultRoute(profile, options),
      controlDefaultRoute:
        profile.controlDefaultRoute || EMPTY_PROFILE.controlDefaultRoute,
      planOutlineKeys: profile.planOutlineKeys ?? null,
      workNavKeys: profile.workNavKeys ?? null,
      dataSlices: resolveEffectiveDataSlices(context),
      uiFeatures: resolveUiFeatures(context, profile.uiFeatures),
      steeringElements: resolveSteeringElements(context),
    }
  }

  const fallback = resolveMethodUiDefaults({
    archetypeKey: context?.archetype_key || null,
    methodKey: context?.method_key || null,
    hasActiveSprint: options.hasActiveSprint,
  })
  return {
    ...fallback,
    dataSlices: resolveEffectiveDataSlices(context),
    uiFeatures: resolveUiFeatures(context, {}),
    steeringElements: resolveSteeringElements(context),
  }
}

/**
 * @param {ResolveOperatingProfileInput} input
 */
export function resolveOperatingProfileFromInput(input = {}) {
  if (input.operatingContext) {
    return resolveOperatingProfile(input.operatingContext, {
      hasActiveSprint: input.hasActiveSprint,
    })
  }
  const fallback = resolveMethodUiDefaults({
    archetypeKey: input.archetypeKey || null,
    methodKey: input.methodKey || null,
    hasActiveSprint: input.hasActiveSprint,
  })
  return { ...fallback, dataSlices: [], uiFeatures: {}, steeringElements: [] }
}

/**
 * @param {ResolveOperatingProfileInput} input
 * @returns {typeof PLAN_OUTLINE_NODES}
 */
export function resolvePlanOutlineNodesFromProfile(input = {}) {
  const { planOutlineKeys } = resolveOperatingProfileFromInput(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 {ResolveOperatingProfileInput} input
 * @returns {typeof WORK_NAV_ITEMS}
 */
export function resolveWorkNavItemsFromProfile(input = {}) {
  const { workNavKeys } = resolveOperatingProfileFromInput(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),
  )
}

/**
 * @param {string} pathname
 * @param {ProcessStep[]} steps
 */
export function resolveActiveProcessStepKey(pathname, steps) {
  return resolveActiveProcessStepKeyFallback(pathname, steps)
}

/**
 * @param {string} routePath
 * @param {ResolveOperatingProfileInput} input
 * @returns {boolean}
 */
export function isRouteAllowedForProfile(routePath, input = {}) {
  const profile = resolveOperatingProfileFromInput(input)
  return isRouteAllowedForMode(routePath, {
    operatingContext: input.operatingContext,
    dataSlices: profile.dataSlices,
  })
}

/**
 * @param {string} routePath
 * @param {ResolveOperatingProfileInput} input
 * @returns {string}
 */
export function resolveRedirectForDisallowedRoute(routePath, input = {}) {
  if (input.operatingContext) {
    return resolveRedirectForModeRoute(routePath, input)
  }
  const profile = resolveOperatingProfileFromInput(input)
  const normalized = (routePath || '').replace(/\/$/, '')
  if (normalized.startsWith('/work/')) return profile.workDefaultRoute
  if (normalized.startsWith('/control/')) return profile.controlDefaultRoute
  return profile.planDefaultRoute
}