import { Fragment, useState, type MouseEvent, type ReactNode } from "react"
import { ChartColumnIcon, ChevronRightIcon, LayoutGridIcon, MoreHorizontalIcon, SettingsIcon, type LucideIcon } from "lucide-react"
import {
  Avatar,
  AvatarFallback,
  AvatarImage,
  Badge,
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
  Button,
  Card,
  CardAction,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
  DashboardContent,
  DashboardLayout,
  DashboardHeader,
  DashboardSidebar,
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
  DashboardMain,
  DataTable,
  DataTableColumnHeader,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
  FilterBar,
  FilterBarActions,
  FilterBarSearch,
  PageHeader,
  PageHeaderActions,
  PageHeaderContent,
  PageHeaderDescription,
  PageHeaderTitle,
  Progress,
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
  Skeleton,
  dataTableSelectColumn,
  useDataTable,
  type DataTableColumnDef,
} from "@hm-design/ui"
import { formatDate } from "./sample-users"
import { countDashboardWorkFilter, dashboardWorks, dashboardWorkFilters, dashboardWorkStatus, dashboardWorkStyle, matchesDashboardWorkStatus, type DashboardWork, type DashboardWorkFilter } from "./dashboard-work-status"
import "./dashboard-composition.css"

// Dashboard Mode: internal navigation, Page Header, KPI cards, Filter Bar and Data Table.
// Menu and profile data are local to this Story. See docs/patterns/dashboard-layout.md.

const photo =
  "data:image/svg+xml;utf8," +
  encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="80" height="80"><rect width="80" height="80" fill="#266651"/><circle cx="40" cy="31" r="14" fill="#bddfd4"/><rect x="14" y="50" width="52" height="40" rx="22" fill="#bddfd4"/></svg>')

const profileData = {
  name: "김한맥",
  description: "프로젝트 관리자",
  photo,
  fallback: "김",
}

const profileActions: { label: string; destructive?: boolean }[] = [
  { label: "프로필 설정" },
  { label: "로그아웃", destructive: true },
]

function ProfileAvatar() {
  return (
    <Avatar>
      <AvatarImage src={profileData.photo} alt="" />
      <AvatarFallback>{profileData.fallback}</AvatarFallback>
    </Avatar>
  )
}

function ProfileMenu({ trigger, side = "bottom", align = "start", modal, matchTrigger = false }: { trigger: ReactNode; side?: "top" | "right" | "bottom" | "left"; align?: "start" | "center" | "end"; modal?: boolean; matchTrigger?: boolean }) {
  return (
    <DropdownMenu modal={modal}>
      <DropdownMenuTrigger asChild>{trigger}</DropdownMenuTrigger>
      <DropdownMenuContent side={side} align={align} className={matchTrigger ? "min-w-(--radix-dropdown-menu-trigger-width)" : undefined}>
        <DropdownMenuLabel>{profileData.name}</DropdownMenuLabel>
        {profileActions.map((action) => (
          <Fragment key={action.label}>
            {action.destructive ? <DropdownMenuSeparator /> : null}
            <DropdownMenuItem variant={action.destructive ? "destructive" : "default"}>{action.label}</DropdownMenuItem>
          </Fragment>
        ))}
      </DropdownMenuContent>
    </DropdownMenu>
  )
}

type Mode = "compact" | "sidebar" | "header-sidebar"
type StatusFilter = DashboardWorkFilter
const statusFilters = dashboardWorkFilters.map((id) => ({ id, ...dashboardWorkStatus[id] }))

// Variant C (ui_viz patterns-variant-c--all) composition: a 48px Compact Header with the title on the left and a floating 40px status
// filter bar centred on the header, followed immediately by the content surface. No GNB, LNB or profile. The structure mirrors the
// reference (header > brand + status bar [context | 전체 | group]); colours, type and controls are HM.
function CompactHeader({ data, status, onStatusChange }: { data: DashboardWork[]; status: StatusFilter; onStatusChange: (status: StatusFilter) => void }) {
  const count = (id: StatusFilter) => countDashboardWorkFilter(data, id)
  const filterButton = (filter: (typeof statusFilters)[number]) => (
    <Button key={filter.id} type="button" variant="ghost" size="sm" data-filter={filter.id} data-status={filter.id} data-issue={filter.id === "issue" ? "true" : undefined} style={dashboardWorkStyle(filter.id)} aria-pressed={status === filter.id} aria-controls="dashboard-compact-results" onClick={() => onStatusChange(filter.id)}>
      {filter.label} <strong>{count(filter.id)}</strong>건
    </Button>
  )
  const [all, ...rest] = statusFilters
  const workStates = rest.filter((filter) => filter.id !== "issue")
  const issue = rest.find((filter) => filter.id === "issue")!
  return (
    <DashboardHeader data-story-slot="compact-header">
      <div data-story-slot="compact-brand">
        <strong>프로젝트 대시보드</strong>
      </div>
      <div data-story-slot="compact-status" role="group" aria-label="업무 상태 필터">
        <span data-story-slot="compact-context">업무</span>
        <span data-story-slot="compact-divider" aria-hidden="true" />
        {filterButton(all)}
        <span data-story-slot="compact-divider" aria-hidden="true" />
        <div data-story-slot="compact-status-group">{workStates.map(filterButton)}</div>
        <span data-story-slot="compact-divider" aria-hidden="true" />
        {filterButton(issue)}
      </div>
    </DashboardHeader>
  )
}

// Dashboard internal menu; kept at every viewport width.
type LocalNode = { id: string; label: string; icon?: LucideIcon; children?: LocalNode[] }

const localNav = (thirdLevel?: boolean): LocalNode[] => [
  { id: "overview", label: "개요", icon: LayoutGridIcon },
  {
    id: "projects",
    label: "업무 관리",
    children: [
      thirdLevel
        ? {
            id: "projects/tasks",
            label: "업무 현황",
            children: [
              { id: "projects/tasks/all", label: "전체 업무" },
              { id: "projects/tasks/mine", label: "담당 업무" },
              { id: "projects/tasks/delayed", label: "지연 업무" },
            ],
          }
        : { id: "projects/tasks", label: "업무 현황" },
      { id: "projects/schedule", label: "일정" },
    ],
  },
  { id: "reports", label: "리포트", icon: ChartColumnIcon },
  { id: "settings", label: "설정", icon: SettingsIcon },
]

const statusBadge = (status: Exclude<StatusFilter, "all">) => (
  <Badge variant="outline" data-status={status} data-issue={status === "issue" ? "true" : undefined} data-work-status={status} style={dashboardWorkStyle(status)}>{dashboardWorkStatus[status].label}</Badge>
)

const columns: DataTableColumnDef<DashboardWork>[] = [
  dataTableSelectColumn<DashboardWork>(),
  { accessorKey: "name", header: ({ column }) => <DataTableColumnHeader column={column} title="업무명" /> },
  { accessorKey: "department", header: "부서" },
  { accessorKey: "status", header: "상태", cell: ({ row }) => <span data-story-slot="work-badges">{statusBadge(row.original.status)}{row.original.issue ? statusBadge("issue") : null}</span>, filterFn: (row, _columnId, value: StatusFilter) => matchesDashboardWorkStatus(row.original, value), enableSorting: false },
  {
    accessorKey: "createdAt",
    header: ({ column }) => <DataTableColumnHeader column={column} title="등록일" />,
    cell: ({ row }) => formatDate(row.original.createdAt),
  },
]

function TaskList({ data, loading, compact, selectedStatus = "all", onReset }: { data: DashboardWork[]; loading?: boolean; compact?: boolean; selectedStatus?: StatusFilter; onReset?: () => void }) {
  const table = useDataTable({ columns, data, getRowId: (row) => row.id })
  const [search, setSearch] = useState("")
  const [status, setStatus] = useState("all")
  const total = table.getFilteredRowModel().rows.length
  return (
    <Card>
      <CardHeader>
        <CardTitle>업무 목록</CardTitle>
        <CardDescription role="status">{dashboardWorkStatus[compact ? selectedStatus : status as StatusFilter].label} 업무 {total}건</CardDescription>
      </CardHeader>
      <CardContent>
        <div className="grid gap-4">
          <FilterBar>
            <FilterBarSearch
              value={search}
              onValueChange={(value) => {
                setSearch(value)
                table.setGlobalFilter(value || undefined)
              }}
              placeholder="업무명·부서 검색"
            />
            {compact ? null : <Select
              value={status}
              onValueChange={(value) => {
                setStatus(value)
                table.getColumn("status")?.setFilterValue(value === "all" ? undefined : value)
              }}
            >
              <SelectTrigger size="medium" aria-label="상태">
                <SelectValue placeholder="상태" />
              </SelectTrigger>
              <SelectContent>
                {statusFilters.map((filter) => <SelectItem key={filter.id} value={filter.id}>{filter.label}</SelectItem>)}
              </SelectContent>
            </Select>}
            <FilterBarActions>
              <Button
                type="button"
                variant="cancel"
                appearance="solid"
                onClick={() => {
                  setSearch("")
                  setStatus("all")
                  table.resetGlobalFilter(true)
                  table.resetColumnFilters(true)
                  onReset?.()
                }}
              >
                초기화
              </Button>
            </FilterBarActions>
          </FilterBar>
          <DataTable table={table} loading={loading} emptyMessage="조건에 맞는 업무가 없습니다." />
        </div>
      </CardContent>
    </Card>
  )
}

function Kpis({ data, loading }: { data: DashboardWork[]; loading?: boolean }) {
  const kpis = statusFilters.map(({ id, label }) => {
    const value = countDashboardWorkFilter(data, id)
    const progress = data.length ? Math.round(value / data.length * 100) : 0
    return { id, label, value, progress }
  })
  return (
    <div className="grid gap-6" style={{ gridTemplateColumns: "repeat(auto-fit, minmax(min(100%, 200px), 1fr))" }}>
      {kpis.map((kpi) => (
        <Card key={kpi.label}>
          <CardHeader>
            <CardDescription>{kpi.label}</CardDescription>
            {loading ? null : (
              <CardAction>
                {kpi.id === "all" ? <Badge variant="secondary">전체</Badge> : statusBadge(kpi.id)}
              </CardAction>
            )}
          </CardHeader>
          <CardContent>
            {loading ? (
              <div className="grid gap-3">
                <Skeleton style={{ height: 36, width: 80 }} />
                <Skeleton style={{ height: 8 }} />
              </div>
            ) : (
              <div className="grid gap-3">
                <p style={{ margin: 0, fontSize: 28, lineHeight: "36px", fontWeight: 700 }}>{kpi.value}</p>
                <Progress value={kpi.progress} aria-label={`${kpi.label} 비율`} />
              </div>
            )}
          </CardContent>
        </Card>
      ))}
    </div>
  )
}

export function DashboardScreen({
  mode = "compact",
  data = dashboardWorks,
  loading,
  longTitle,
  wide,
  thirdLevel,
}: {
  mode?: Mode
  data?: DashboardWork[]
  loading?: boolean
  longTitle?: boolean
  wide?: boolean
  thirdLevel?: boolean
}) {
  const [current, setCurrent] = useState(thirdLevel ? "projects/tasks/all" : "projects/tasks")
  const [compactStatus, setCompactStatus] = useState<StatusFilter>("all")
  const compact = mode === "compact"
  const resultData = compact ? data.filter((row) => matchesDashboardWorkStatus(row, compactStatus)) : data
  const [openGroups, setOpenGroups] = useState<Record<string, boolean>>({})
  const go = (id: string) => (event: MouseEvent) => {
    event.preventDefault()
    setCurrent(id)
  }
  const isCurrent = (id: string) => current === id || current.startsWith(`${id}/`)
  const nav = localNav(thirdLevel)
  const dashboardMenu = (nodes: LocalNode[]): ReactNode =>
    nodes.map((node) =>
      node.children ? (
        <Collapsible
          key={node.id}
          data-current={isCurrent(node.id) ? "" : undefined}
          open={openGroups[node.id] ?? true}
          onOpenChange={(value) => setOpenGroups((state) => ({ ...state, [node.id]: value }))}
        >
          <CollapsibleTrigger asChild><Button variant="ghost" type="button"><ChevronRightIcon aria-hidden="true" />{node.label}</Button></CollapsibleTrigger>
          <CollapsibleContent className="pl-3">{dashboardMenu(node.children)}</CollapsibleContent>
        </Collapsible>
      ) : (
        <Button key={node.id} variant="ghost" asChild><a href={`#${node.id}`} aria-current={current === node.id ? "page" : undefined} onClick={go(node.id)}>
          {node.icon ? <node.icon aria-hidden="true" /> : null}
          {node.label}
        </a></Button>
      )
    )
  const title = longTitle ? "전사 프로젝트 포트폴리오의 진행 현황과 담당 부서별 업무 상세 현황" : "업무 현황"
  const sidebar = (
    <DashboardSidebar>
      <strong>프로젝트 대시보드</strong>
      <nav aria-label="Dashboard 업무 메뉴">{dashboardMenu(nav)}</nav>
      <ProfileMenu side="right" align="end" trigger={
        <Button type="button" variant="ghost" aria-label={`${profileData.name} 사용자 메뉴`}>
          <ProfileAvatar />{profileData.name}
        </Button>
      } />
    </DashboardSidebar>
  )

  // Variant C content: heading, then the result card (Page Header's own 20px bottom spacing; no breadcrumb, actions or KPI cards in the reference).
  const compactMain = (
    <DashboardMain id="dashboard-compact-results">
      <PageHeader>
        <PageHeaderContent>
          <PageHeaderTitle>업무 현황을 한눈에 확인하세요</PageHeaderTitle>
        </PageHeaderContent>
      </PageHeader>
      <TaskList data={resultData} loading={loading} compact selectedStatus={compactStatus} onReset={() => setCompactStatus("all")} />
    </DashboardMain>
  )

  const main = compact ? compactMain : (
    <DashboardMain>
        <PageHeader>
          <PageHeaderContent>
            <Breadcrumb>
              <BreadcrumbList>
                <BreadcrumbItem>
                  <BreadcrumbLink href="#dashboard">홈</BreadcrumbLink>
                </BreadcrumbItem>
                <BreadcrumbSeparator />
                <BreadcrumbItem>
                  <BreadcrumbLink href="#projects">프로젝트</BreadcrumbLink>
                </BreadcrumbItem>
                <BreadcrumbSeparator />
                <BreadcrumbItem>
                  <BreadcrumbPage>업무 현황</BreadcrumbPage>
                </BreadcrumbItem>
              </BreadcrumbList>
            </Breadcrumb>
            <PageHeaderTitle>{title}</PageHeaderTitle>
            <PageHeaderDescription>프로젝트별 업무 진행 상황을 확인하고 조회합니다.</PageHeaderDescription>
          </PageHeaderContent>
          <PageHeaderActions>
            <Button type="button" variant="cancel" appearance="solid">
              다운로드
            </Button>
            <Button type="button" variant="primary">
              신규 등록
            </Button>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button type="button" variant="primary" appearance="outline" size="icon" aria-label="더보기">
                  <MoreHorizontalIcon />
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="end">
                <DropdownMenuItem>일괄 수정</DropdownMenuItem>
                <DropdownMenuItem>보관</DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          </PageHeaderActions>
        </PageHeader>
        <DashboardContent>
          <Kpis data={data} loading={loading} />
          <TaskList data={resultData} loading={loading} />
          {wide ? (
            <Card>
              <CardHeader>
                <CardTitle>넓은 내용</CardTitle>
                <CardDescription>페이지를 밀지 않고 카드 안에서 가로 스크롤합니다.</CardDescription>
              </CardHeader>
              <CardContent>
                <div style={{ overflowX: "auto" }}>
                  <div style={{ width: 1600, height: 80, background: "var(--hm-sem-bg-content)" }} />
                </div>
              </CardContent>
            </Card>
          ) : null}
        </DashboardContent>
    </DashboardMain>
  )

  return (
    <DashboardLayout
      className={compact ? "dashboard-production dashboard-story-compact" : "dashboard-production"}
      header={compact ? <CompactHeader data={data} status={compactStatus} onStatusChange={setCompactStatus} /> : mode === "header-sidebar" ? <DashboardHeader><strong>업무 현황</strong></DashboardHeader> : undefined}
      sidebar={compact ? undefined : sidebar}
    >
      {main}
    </DashboardLayout>
  )
}