"use client"

import { useCallback, useEffect, useMemo, useState } from "react"
import {
  BrainCircuitIcon,
  BugIcon,
  MoreHorizontalIcon,
  PlusIcon,
  RefreshCwIcon,
  RotateCcwIcon,
  SearchIcon,
  Trash2Icon,
} from "lucide-react"
import { toast } from "sonner"

import {
  DashboardPage,
  DashboardTableShell,
  DashboardTableStateRow,
  DashboardToolbar,
} from "@/components/dashboard-page"
import { ListPagination } from "@/components/list-pagination"
import { OptionCombobox } from "@/components/option-combobox"
import { Badge } from "@/components/ui/badge"
import { Button } from "@/components/ui/button"
import { ButtonGroup } from "@/components/ui/button-group"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { Input } from "@/components/ui/input"
import { Switch } from "@/components/ui/switch"
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table"
import {
  createSkillDefinition,
  deleteSkillDefinition,
  fetchSkillDefinitions,
  restoreSkillDefinition,
  updateSkillDefinition,
  updateSkillDefinitionStatus,
  type CreateSkillDefinitionPayload,
  type PageResult,
  type SkillDefinition,
} from "@/lib/api/admin"
import { useI18n } from "@/i18n/provider"
import { Status } from "@/lib/generated/enums"
import { formatDateTime } from "@/lib/utils"
import { EditDialog } from "./_components/edit"
import { DebugDialog } from "./_components/debug-dialog"

type TFunction = (key: string, values?: Record<string, string | number>) => string

function statusLabel(status: number, t: TFunction) {
  if (status === Status.Ok) {
    return t("skillDefinition.statusOk")
  }
  if (status === Status.Disabled) {
    return t("skillDefinition.statusDisabled")
  }
  if (status === Status.Deleted) {
    return t("skillDefinition.statusDeleted")
  }
  return String(status)
}

function getStatusFilterOptions(t: TFunction) {
  return [
    { value: "all", label: t("skillDefinition.allStatus") },
    { value: String(Status.Ok), label: t("skillDefinition.statusOk") },
    { value: String(Status.Disabled), label: t("skillDefinition.statusDisabled") },
    { value: String(Status.Deleted), label: t("skillDefinition.statusDeleted") },
  ]
}

type SkillRowProps = {
  item: SkillDefinition
  actionLoadingId: number | null
  openEditDialog: (item: SkillDefinition) => void
  openDebugDialog: (item: SkillDefinition) => void
  handleToggleStatus: (item: SkillDefinition) => void
  handleDelete: (item: SkillDefinition) => void
  handleRestore: (item: SkillDefinition) => void
  t: TFunction
}

function SkillRow({
  item,
  actionLoadingId,
  openEditDialog,
  openDebugDialog,
  handleToggleStatus,
  handleDelete,
  handleRestore,
  t,
}: SkillRowProps) {
  const isDeleted = item.status === Status.Deleted
  const statusBadgeVariant = isDeleted
    ? "destructive"
    : item.status === Status.Ok
      ? "default"
      : "outline"

  return (
    <TableRow className={isDeleted ? "bg-destructive/5" : undefined}>
      <TableCell>
        <div className="flex items-start gap-3">
          <div className="mt-0.5 flex size-10 items-center justify-center rounded-2xl bg-muted text-muted-foreground">
            <BrainCircuitIcon className="size-4" />
          </div>
          <div className="min-w-0">
            <div className="flex flex-wrap items-center gap-2">
              <div className="font-medium">{item.name}</div>
              <Badge variant="outline">{item.code}</Badge>
              <Badge variant="secondary">{t("skillDefinition.whitelistCount", { count: item.toolWhitelist.length })}</Badge>
              <Badge variant="secondary">{t("skillDefinition.exampleCount", { count: item.examples.length })}</Badge>
            </div>
            <div className="mt-2 space-y-2">
              <div className="line-clamp-2 text-sm leading-6 text-muted-foreground">
                {item.description || t("skillDefinition.noDescription")}
              </div>
            </div>
            {item.toolWhitelist.length > 0 ? (
              <div className="mt-2 flex flex-wrap gap-2">
                {item.toolWhitelist.slice(0, 3).map((toolCode) => (
                  <Badge key={toolCode} variant="outline">
                    {toolCode}
                  </Badge>
                ))}
                {item.toolWhitelist.length > 3 ? (
                  <Badge variant="outline">+{item.toolWhitelist.length - 3}</Badge>
                ) : null}
              </div>
            ) : null}
          </div>
        </div>
      </TableCell>
      <TableCell>
        <div className="flex items-center gap-3">
          <Switch
            checked={item.status === Status.Ok}
            disabled={actionLoadingId === item.id || isDeleted}
            onCheckedChange={() => void handleToggleStatus(item)}
            aria-label={t("skillDefinition.toggleStatus", { name: item.name })}
          />
          <Badge variant={statusBadgeVariant}>
            {statusLabel(item.status, t)}
          </Badge>
        </div>
      </TableCell>
      <TableCell>
        <div className="space-y-1 text-sm">
          <div>{formatDateTime(item.updatedAt)}</div>
          <div className="text-xs text-muted-foreground">
            {item.updateUserName || "-"}
          </div>
        </div>
      </TableCell>
      <TableCell className="text-right">
        <ButtonGroup className="ml-auto">
          <Button variant="outline" size="sm" onClick={() => openDebugDialog(item)}>
            <BugIcon />
            {t("skillDefinition.debug")}
          </Button>
          <Button variant="outline" size="sm" onClick={() => openEditDialog(item)}>
            {t("skillDefinition.edit")}
          </Button>
          <DropdownMenu>
            <DropdownMenuTrigger
              render={<Button variant="outline" size="icon-sm" />}
              aria-label={t("skillDefinition.moreActions", { name: item.name })}
            >
              <MoreHorizontalIcon />
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end" className="w-40 min-w-40">
              {isDeleted ? (
                <DropdownMenuItem
                  disabled={actionLoadingId === item.id}
                  onClick={() => void handleRestore(item)}
                >
                  <RotateCcwIcon />
                  {actionLoadingId === item.id ? t("skillDefinition.restoring") : t("skillDefinition.restore")}
                </DropdownMenuItem>
              ) : (
                <DropdownMenuItem
                  disabled={actionLoadingId === item.id}
                  onClick={() => void handleDelete(item)}
                  className="text-destructive focus:text-destructive"
                >
                  <Trash2Icon />
                  {actionLoadingId === item.id ? t("skillDefinition.deleting") : t("skillDefinition.delete")}
                </DropdownMenuItem>
              )}
            </DropdownMenuContent>
          </DropdownMenu>
        </ButtonGroup>
      </TableCell>
    </TableRow>
  )
}

export default function DashboardSkillsPage() {
  const t = useI18n()
  const [nameInput, setNameInput] = useState("")
  const [codeInput, setCodeInput] = useState("")
  const [statusFilterInput, setStatusFilterInput] = useState("all")
  const [name, setName] = useState("")
  const [code, setCode] = useState("")
  const [statusFilter, setStatusFilter] = useState("all")
  const [page, setPage] = useState(1)
  const [limit, setLimit] = useState(20)
  const [loading, setLoading] = useState(true)
  const [saving, setSaving] = useState(false)
  const [actionLoadingId, setActionLoadingId] = useState<number | null>(null)
  const [dialogOpen, setDialogOpen] = useState(false)
  const [debugDialogOpen, setDebugDialogOpen] = useState(false)
  const [editingItem, setEditingItem] = useState<SkillDefinition | null>(null)
  const [debuggingItem, setDebuggingItem] = useState<SkillDefinition | null>(null)
  const [result, setResult] = useState<PageResult<SkillDefinition>>({
    results: [],
    page: { page: 1, limit: 20, total: 0 },
  })
  const statusFilterOptions = useMemo(() => getStatusFilterOptions(t), [t])

  const loadData = useCallback(async () => {
    setLoading(true)
    try {
      const data = await fetchSkillDefinitions({
        name: name.trim() || undefined,
        code: code.trim() || undefined,
        status: statusFilter === "all" ? undefined : Number(statusFilter),
        page,
        limit,
      })
      setResult(data)
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t("skillDefinition.loadFailed"))
    } finally {
      setLoading(false)
    }
  }, [name, code, statusFilter, page, limit, t])

  useEffect(() => {
    void loadData()
  }, [loadData])

  function applyFilters() {
    setName(nameInput)
    setCode(codeInput)
    setStatusFilter(statusFilterInput)
    setPage(1)
  }

  function handleFilterKeyDown(event: React.KeyboardEvent<HTMLInputElement>) {
    if (event.key !== "Enter") {
      return
    }
    event.preventDefault()
    applyFilters()
  }

  function handlePageChange(nextPage: number) {
    if (nextPage < 1 || nextPage === page) {
      return
    }
    setPage(nextPage)
  }

  function openCreateDialog() {
    setEditingItem(null)
    setDialogOpen(true)
  }

  function openEditDialog(item: SkillDefinition) {
    setEditingItem(item)
    setDialogOpen(true)
  }

  function openDebugDialog(item: SkillDefinition) {
    setDebuggingItem(item)
    setDebugDialogOpen(true)
  }

  function handleDialogOpenChange(open: boolean) {
    if (saving) {
      return
    }
    if (!open) {
      setEditingItem(null)
    }
    setDialogOpen(open)
  }

  function handleDebugDialogOpenChange(open: boolean) {
    if (!open) {
      setDebuggingItem(null)
    }
    setDebugDialogOpen(open)
  }

  async function handleSubmit(payload: CreateSkillDefinitionPayload) {
    if (saving) {
      return
    }

    setSaving(true)
    try {
      if (editingItem) {
        await updateSkillDefinition({
          id: editingItem.id,
          ...payload,
        })
        toast.success(t("skillDefinition.updated", { name: editingItem.name }))
      } else {
        await createSkillDefinition(payload)
        toast.success(t("skillDefinition.created", { name: payload.name }))
      }
      setDialogOpen(false)
      setEditingItem(null)
      await loadData()
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t("skillDefinition.saveFailed"))
    } finally {
      setSaving(false)
    }
  }

  async function handleToggleStatus(item: SkillDefinition) {
    if (item.status === Status.Deleted) {
      return
    }

    const nextStatus = item.status === Status.Ok ? Status.Disabled : Status.Ok

    setActionLoadingId(item.id)
    try {
      await updateSkillDefinitionStatus(item.id, nextStatus)
      toast.success(t(nextStatus === Status.Ok ? "skillDefinition.enabled" : "skillDefinition.disabled", { name: item.name }))
      await loadData()
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t("skillDefinition.statusUpdateFailed"))
    } finally {
      setActionLoadingId(null)
    }
  }

  async function handleDelete(item: SkillDefinition) {
    if (item.status === Status.Deleted) {
      return
    }

    setActionLoadingId(item.id)
    try {
      await deleteSkillDefinition(item.id)
      toast.success(t("skillDefinition.deleted", { name: item.name }))
      await loadData()
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t("skillDefinition.deleteFailed"))
    } finally {
      setActionLoadingId(null)
    }
  }

  async function handleRestore(item: SkillDefinition) {
    if (item.status !== Status.Deleted) {
      return
    }

    setActionLoadingId(item.id)
    try {
      await restoreSkillDefinition(item.id)
      toast.success(t("skillDefinition.restored", { name: item.name }))
      await loadData()
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t("skillDefinition.restoreFailed"))
    } finally {
      setActionLoadingId(null)
    }
  }

  return (
    <>
      <DashboardPage>
        <DashboardToolbar
          actions={
            <>
              <Button variant="outline" onClick={() => void loadData()} disabled={loading}>
                <RefreshCwIcon className={loading ? "animate-spin" : ""} />
                {t("skillDefinition.refresh")}
              </Button>
              <Button onClick={openCreateDialog}>
                <PlusIcon />
                {t("skillDefinition.new")}
              </Button>
            </>
          }
        >
          <div className="relative w-full sm:w-72">
            <SearchIcon className="pointer-events-none absolute top-1/2 left-3 size-4 -translate-y-1/2 text-muted-foreground" />
            <Input
              value={nameInput}
              onChange={(event) => setNameInput(event.target.value)}
              onKeyDown={handleFilterKeyDown}
              placeholder={t("skillDefinition.filterName")}
              className="pl-9"
            />
          </div>
          <Input
            value={codeInput}
            onChange={(event) => setCodeInput(event.target.value)}
            onKeyDown={handleFilterKeyDown}
            placeholder={t("skillDefinition.filterCode")}
            className="w-full sm:w-56"
          />
          <div className="w-full sm:w-36">
            <OptionCombobox
              value={statusFilterInput}
              options={statusFilterOptions}
              placeholder={t("skillDefinition.allStatus")}
              searchPlaceholder={t("skillDefinition.searchStatus")}
              emptyText={t("skillDefinition.emptyStatus")}
              onChange={setStatusFilterInput}
            />
          </div>
          <Button variant="outline" onClick={applyFilters} disabled={loading}>
            <SearchIcon />
            {t("skillDefinition.query")}
          </Button>
        </DashboardToolbar>

        <DashboardTableShell
          pagination={
            <ListPagination
              page={result.page.page}
              total={result.page.total}
              limit={limit}
              loading={loading}
              onPageChange={handlePageChange}
              onLimitChange={(nextLimit) => {
                setLimit(nextLimit)
                setPage(1)
              }}
            />
          }
        >
            <Table>
              <TableHeader className="bg-muted/40">
                <TableRow>
                  <TableHead>Skill</TableHead>
                  <TableHead>{t("skillDefinition.status")}</TableHead>
                  <TableHead>{t("skillDefinition.updatedAt")}</TableHead>
                  <TableHead className="w-[168px] text-right">{t("skillDefinition.actions")}</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {loading || result.results.length === 0 ? (
                  <DashboardTableStateRow
                    colSpan={4}
                    loading={loading}
                    loadingText={t("skillDefinition.loadingRows")}
                    emptyText={t("skillDefinition.emptyRows")}
                  />
                ) : null}
                {result.results.map((item) => (
                  <SkillRow
                    key={item.id}
                    item={item}
                    actionLoadingId={actionLoadingId}
                    openEditDialog={openEditDialog}
                    openDebugDialog={openDebugDialog}
                    handleToggleStatus={handleToggleStatus}
                    handleDelete={handleDelete}
                    handleRestore={handleRestore}
                    t={t}
                  />
                ))}
              </TableBody>
            </Table>
        </DashboardTableShell>
      </DashboardPage>

      <EditDialog
        open={dialogOpen}
        saving={saving}
        itemId={editingItem?.id ?? null}
        onOpenChange={handleDialogOpenChange}
        onSubmit={handleSubmit}
      />
      <DebugDialog
        open={debugDialogOpen}
        skillCode={debuggingItem?.code ?? ""}
        skillName={debuggingItem?.name ?? ""}
        onOpenChange={handleDebugDialogOpenChange}
      />
    </>
  )
}