import { ClipboardList, ReceiptText, Settings, Warehouse } from '@lucide/vue'
import { clientModuleRegistry } from '../modules/registry.ts'
import type { ClientModuleManifest } from '../modules/types.ts'
import {
  getNavigationLeaves,
  isNavigationGroup,
  type ClientNavigationGroup,
  type ClientNavigationLeaf,
  type ClientNavigationNode,
} from './tree.ts'

export {
  getNavigationLeaves,
  type ClientNavigationGroup,
  type ClientNavigationLeaf,
  type ClientNavigationNode,
} from './tree.ts'

function buildModuleNavigationLeaves(module: ClientModuleManifest): ClientNavigationLeaf[] {
  const leaves: ClientNavigationLeaf[] = []
  for (const route of module.routes) {
    if (route.release !== 'active' || !route.navigation) continue
    leaves.push({
      key: route.navigation.key,
      title: route.navigation.title ?? route.meta.title,
      icon: route.navigation.icon,
      path: route.path ? `/${route.path}` : '/',
      permission: route.meta.permission,
    })
  }
  return leaves
}

const registeredLeaves = clientModuleRegistry.flatMap(buildModuleNavigationLeaves)

function requireLeaf(key: string, title?: string): ClientNavigationLeaf {
  const leaf = registeredLeaves.find((item) => item.key === key)
  if (!leaf) throw new Error(`Missing client navigation leaf: ${key}`)
  return title ? { ...leaf, title } : leaf
}

/**
 * The sidebar is organised around customer tasks instead of implementation modules.
 * Account and notification routes remain hidden utility entries so breadcrumbs and
 * permission-aware fallbacks keep working from the fixed top-header shortcuts.
 */
export const clientNavigation: ClientNavigationNode[] = [
  requireLeaf('dashboard', '首页'),
  {
    key: 'order-center',
    title: '订单中心',
    icon: ClipboardList,
    children: [
      requireLeaf('first-leg-orders', '头程订单'),
      requireLeaf('cross-border-procurement'),
      requireLeaf('cross-border-domestic-trucking'),
      requireLeaf('cross-border-pallet-shipping'),
    ],
  },
  requireLeaf('first-leg-customs-documents', '报关资料'),
  requireLeaf('first-leg-sailing-prices', '船期价格'),
  {
    key: 'overseas-warehouse-center',
    title: '海外仓',
    icon: Warehouse,
    children: [
      requireLeaf('overseas-labeling'),
      requireLeaf('overseas-storage-transfer'),
      requireLeaf('overseas-cargo-disposal'),
      requireLeaf('overseas-return-relabel', '退货换标'),
    ],
  },
  {
    key: 'finance-center',
    title: '费用与账单',
    icon: ReceiptText,
    children: [
      requireLeaf('finance-account'),
      requireLeaf('finance-bills'),
    ],
  },
  {
    key: 'company-center',
    title: '企业设置',
    icon: Settings,
    dividerBefore: true,
    children: [
      requireLeaf('company-profile'),
      requireLeaf('company-members'),
      requireLeaf('company-roles'),
      requireLeaf('company-permissions'),
    ],
  },
  { ...requireLeaf('account-profile'), hidden: true },
  { ...requireLeaf('notifications-list'), hidden: true },
]

export function filterNavigationByPermissions(
  nodes: readonly ClientNavigationNode[],
  permissions: readonly string[],
): ClientNavigationNode[] {
  const allowed = new Set(permissions)
  const result: ClientNavigationNode[] = []
  for (const node of nodes) {
    if (node.hidden) continue
    if (!isNavigationGroup(node)) {
      if (allowed.has(node.permission)) result.push(node)
      continue
    }
    const children = filterNavigationByPermissions(node.children, permissions)
    if (children.length > 0) result.push({ ...node, children: children as [ClientNavigationNode, ...ClientNavigationNode[]] })
  }
  return result
}

export function getFirstAccessiblePath(permissions: readonly string[]) {
  const visiblePath = getNavigationLeaves(filterNavigationByPermissions(clientNavigation, permissions))[0]?.path
  if (visiblePath) return visiblePath

  const allowed = new Set(permissions)
  return getNavigationLeaves(clientNavigation).find((leaf) => allowed.has(leaf.permission))?.path ?? '/forbidden'
}

export interface ClientBreadcrumbItem {
  title: string
  path?: string
}

function findNavigationTrail(
  nodes: readonly ClientNavigationNode[],
  path: string,
  parents: readonly ClientBreadcrumbItem[] = [],
): ClientBreadcrumbItem[] | undefined {
  for (const node of nodes) {
    if (isNavigationGroup(node)) {
      const result = findNavigationTrail(node.children, path, [...parents, { title: node.title }])
      if (result) return result
      continue
    }
    if (node.path === path) return [...parents, { title: node.title, path: node.path }]
  }
}

export function getRouteBreadcrumbs(path: string, currentTitle: string): ClientBreadcrumbItem[] {
  const home: ClientBreadcrumbItem = { title: '首页', path: '/' }
  if (path === '/') return [{ title: '首页' }]

  const leaves = getNavigationLeaves(clientNavigation)
    .filter((leaf) => leaf.path !== '/' && (path === leaf.path || path.startsWith(`${leaf.path}/`)))
    .sort((left, right) => right.path.length - left.path.length)
  const parentLeaf = leaves[0]
  const trail = parentLeaf ? findNavigationTrail(clientNavigation, parentLeaf.path) ?? [] : []
  if (parentLeaf && path === parentLeaf.path && trail.length > 0) {
    trail[trail.length - 1] = { ...trail[trail.length - 1], title: currentTitle }
  }
  const items = [home, ...trail]
  if (items.at(-1)?.title !== currentTitle) items.push({ title: currentTitle })
  if (items.length > 1) delete items.at(-1)!.path
  return items
}

function findNavigationParentKeys(
  nodes: readonly ClientNavigationNode[],
  path: string,
  parentKeys: readonly string[],
): string[] | undefined {
  for (const node of nodes) {
    if (isNavigationGroup(node)) {
      const result = findNavigationParentKeys(node.children, path, [...parentKeys, node.key])
      if (result) return result
    } else if (node.path === path) {
      return [...parentKeys]
    }
  }
}

export function getNavigationParentKeys(nodes: readonly ClientNavigationNode[], path: string): string[] {
  return findNavigationParentKeys(nodes, path, []) ?? []
}

export function openNavigationParentKeys(
  path: string,
  nodes: readonly ClientNavigationNode[],
  open: (key: string) => void,
) {
  for (const key of getNavigationParentKeys(nodes, path)) {
    open(key)
  }
}