"use client";

import Image from "@/components/ui/resilient-image";
import Link from "next/link";
import { useEffect, useMemo, useRef, useState, type ReactNode } from "react";
import {
  CopyIcon,
  GripVerticalIcon,
  PlusIcon,
  Trash2Icon,
  UserRoundIcon,
} from "lucide-react";
import {
  closestCenter,
  DndContext,
  KeyboardSensor,
  PointerSensor,
  useSensor,
  useSensors,
  type DragEndEvent,
} from "@dnd-kit/core";
import {
  arrayMove,
  rectSortingStrategy,
  SortableContext,
  sortableKeyboardCoordinates,
  useSortable,
} from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";
import { toast } from "sonner";

import { saveStygianRecommendationsAction } from "@/app/admin/stygian/actions";
import { AutosaveStatus } from "@/components/admin/autosave-status";
import { StygianSyncButton } from "@/components/admin/stygian-sync-button";
import {
  ArtifactSelect,
  CatalogDropdown,
  CharacterSelect,
  WeaponSelect,
} from "@/components/admin/ui/catalog-select";
import { DeleteConfirmationDialog } from "@/components/admin/ui/delete-confirmation-dialog";
import {
  StygianBossCard,
  StygianBossTab,
  type StygianBossDisplay,
} from "@/components/stygian/stygian-boss-display";
import {
  AdminDropdown,
  ConstellationSelect,
  ElementSelect,
  RefinementSelect,
} from "@/components/admin/ui/option-select";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Field,
  FieldGroup,
  FieldLabel,
  FieldSet,
  FieldLegend,
} from "@/components/ui/field";
import {
  Popover,
  PopoverContent,
  PopoverDescription,
  PopoverHeader,
  PopoverTitle,
  PopoverTrigger,
} from "@/components/ui/popover";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { elementIconFilter } from "@/lib/catalog/element";
import { AutosaveCoordinator, type AutosaveStatus as CoordinatorStatus } from "@/lib/editor/autosave";
import { supportsWeaponType } from "@/lib/catalog/lunaris";
import { stygianBossPositionLabels, stygianBossPositions, stygianLevels } from "@/lib/stygian/constants";
import {
  stygianElements,
  type StygianRecommendationItemInput,
} from "@/lib/stygian/schema";
import { cn } from "@/lib/utils";

type CatalogItem = {
  key: string;
  name: string;
  aliases: string[];
  imageUrl: string;
  rarity: number | null;
  weaponType?: string | null;
};
type Character = CatalogItem & {
  element: string | null;
  elementIconUrl: string | null;
};
type ScheduleSummary = { scheduleId: number; challengeName: string };
type Boss = StygianBossDisplay & { level: number; position: number };
type StoredItem = {
  kind: string;
  catalogKey: string | null;
  weaponKey: string | null;
  artifactKey: string | null;
  refinement: number | null;
  constellationLevel: number | null;
  element: string | null;
};
type Recommendation = {
  id: string;
  level: number;
  bossPosition: number;
  kind: string;
  items: StoredItem[];
};

const characterPlaceholderIcon = <UserRoundIcon className="size-10" aria-hidden="true" />;
const weaponPlaceholderIcon = <Image src="/icon/nav/Weapon.png" alt="" width={32} height={32} className="size-8 object-contain opacity-60" />;
const artifactPlaceholderIcon = <Image src="/icon/nav/Artifact.webp" alt="" width={32} height={32} className="size-8 object-contain opacity-60" />;

function toInput(item: StoredItem): StygianRecommendationItemInput | null {
  if (
    (item.kind === "character" ||
      item.kind === "weapon" ||
      item.kind === "artifact") &&
    item.catalogKey
  ) {
    return item.kind === "character"
      ? {
          kind: "character",
          catalogKey: item.catalogKey,
          weaponKey: item.weaponKey,
          artifactKey: item.artifactKey,
          constellationLevel: item.constellationLevel ?? 0,
          refinement: item.refinement ?? 1,
        }
      : { kind: item.kind, catalogKey: item.catalogKey };
  }
  if (
    item.kind === "element" &&
    item.element &&
    stygianElements.includes(item.element as (typeof stygianElements)[number])
  ) {
    return {
      kind: "element",
      element: item.element as (typeof stygianElements)[number],
    };
  }
  return null;
}

function ItemPicker({
  characters,
  weapons,
  artifacts,
  onAdd,
}: {
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
  onAdd: (item: StygianRecommendationItemInput) => void;
}) {
  const [kind, setKind] =
    useState<StygianRecommendationItemInput["kind"]>("character");
  const catalog =
    kind === "character" ? characters : kind === "weapon" ? weapons : artifacts;
  return (
    <FieldGroup className="gap-3">
      <Field>
        <FieldLabel>Type</FieldLabel>
        <AdminDropdown
          value={kind}
          onValueChange={(next) => setKind(next as typeof kind)}
          triggerProps={{ className: "w-full" }}
          options={[
            { value: "character", label: "Character" },
            { value: "element", label: "Element" },
            { value: "weapon", label: "Weapon" },
            { value: "artifact", label: "Artifact" },
          ]}
        />
      </Field>
      {kind === "element" ? (
        <Field>
          <FieldLabel>Element</FieldLabel>
          <ElementSelect
            elements={stygianElements}
            iconUrls={Object.fromEntries(
              characters.flatMap((character) =>
                character.element && character.elementIconUrl
                  ? [[character.element, character.elementIconUrl]]
                  : [],
              ),
            )}
            placeholder="Choose element…"
            onValueChange={(next) =>
              onAdd({
                kind: "element",
                element: next as (typeof stygianElements)[number],
              })
            }
            triggerProps={{ className: "w-full" }}
          />
        </Field>
      ) : null}
      {kind !== "element" ? (
        <Field>
          <FieldLabel>Recommendation</FieldLabel>
          <CatalogDropdown
            items={catalog}
            value=""
            onValueChange={(catalogKey) => {
              if (!catalogKey) return;
              if (kind === "character")
                onAdd({
                  kind,
                  catalogKey,
                  weaponKey: null,
                  artifactKey: null,
                  constellationLevel: 0,
                  refinement: 1,
                });
              else if (kind === "weapon") onAdd({ kind, catalogKey });
              else onAdd({ kind: "artifact", catalogKey });
            }}
            placeholder={`Search ${kind}…`}
            emptyLabel="No matches"
            rarityBackground
            characterBackground={kind === "character"}
          />
        </Field>
      ) : null}
    </FieldGroup>
  );
}

function AddRecommendationSlot({
  characters,
  weapons,
  artifacts,
  onAdd,
}: {
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
  onAdd: (item: StygianRecommendationItemInput) => void;
}) {
  const [open, setOpen] = useState(false);
  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger
        render={
          <Button
            variant="outline"
            className="aspect-3/4 h-auto min-h-28 w-full border-dashed"
          />
        }
      >
        <PlusIcon />
        <span className="sr-only">Add recommendation</span>
      </PopoverTrigger>
      <PopoverContent
        align="start"
        className="w-[min(22rem,calc(100vw-2rem))] p-4"
      >
        <PopoverHeader>
          <PopoverTitle>Add recommendation</PopoverTitle>
          <PopoverDescription>
            Selecting an item adds it immediately.
          </PopoverDescription>
        </PopoverHeader>
        <ItemPicker
          characters={characters}
          weapons={weapons}
          artifacts={artifacts}
          onAdd={(item) => {
            onAdd(item);
            setOpen(false);
          }}
        />
      </PopoverContent>
    </Popover>
  );
}

function AddCharacterSlot({
  characters,
  onAdd,
}: {
  characters: Character[];
  onAdd: (item: StygianRecommendationItemInput) => void;
}) {
  return (
    <CharacterSelect
      presentation="slot"
      items={characters}
      value=""
      label="Choose character"
      placeholder="Search character…"
      placeholderIcon={characterPlaceholderIcon}
      emptyLabel="No matches"
      className="rounded-lg border-dashed"
      onValueChange={(catalogKey) => {
        if (catalogKey)
          onAdd({
            kind: "character",
            catalogKey,
            weaponKey: null,
            artifactKey: null,
            constellationLevel: 0,
            refinement: 1,
          });
      }}
    />
  );
}

function VisualRecommendation({
  item,
  onChange,
  onRemove,
  characters,
  weapons,
  artifacts,
  teamLayout = false,
  dragHandle,
}: {
  item: StygianRecommendationItemInput;
  onChange: (item: StygianRecommendationItemInput) => void;
  onRemove: () => void;
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
  teamLayout?: boolean;
  dragHandle?: ReactNode;
}) {
  const character =
    item.kind === "character"
      ? characters.find((entry) => entry.key === item.catalogKey)
      : null;
  const weapon =
    item.kind === "character"
      ? weapons.find((entry) => entry.key === item.weaponKey)
      : null;
  const artifact =
    item.kind === "character"
      ? artifacts.find((entry) => entry.key === item.artifactKey)
      : null;
  const compatibleWeapons = weapons.filter((entry) =>
    supportsWeaponType(character?.weaponType, entry.weaponType),
  );
  const elementSource =
    item.kind === "element"
      ? characters.find(
          (entry) => entry.element === item.element && entry.elementIconUrl,
        )
      : null;
  const elementIconUrls = Object.fromEntries(
    characters.flatMap((entry) =>
      entry.element && entry.elementIconUrl
        ? [[entry.element, entry.elementIconUrl]]
        : [],
    ),
  );
  const updateCharacter = (
    patch: Partial<
      Extract<StygianRecommendationItemInput, { kind: "character" }>
    >,
  ) => {
    if (item.kind === "character") onChange({ ...item, ...patch });
  };
  return (
    <div className="relative min-w-0 overflow-hidden rounded-xl border bg-card p-1.5">
      {dragHandle ? (
        <div className="mb-1 flex h-7 items-center justify-end">
          {dragHandle}
        </div>
      ) : null}
      {character ? (
        <>
          <div className={cn("grid gap-1", teamLayout && "grid-cols-3")}>
            <CharacterSelect
              presentation="slot"
              items={characters}
              value={character.key}
              label="Choose character"
              placeholder="Search character…"
              placeholderIcon={characterPlaceholderIcon}
              emptyLabel="No matches"
              className={cn(
                "rounded-lg border-0 [&>img]:p-0",
                teamLayout && "col-span-2 row-span-2",
              )}
              onValueChange={(catalogKey) => {
                if (catalogKey)
                  updateCharacter({
                    catalogKey,
                    weaponKey: null,
                    artifactKey: null,
                    constellationLevel: 0,
                    refinement: 1,
                  });
              }}
            />
            {teamLayout ? (
              <div className="grid min-w-0 grid-cols-1 gap-1">
                <WeaponSelect
                  presentation="slot"
                  items={compatibleWeapons}
                  value={weapon?.key ?? ""}
                  label={`Choose weapon for ${character.name}`}
                  placeholder="Search weapon…"
                  placeholderIcon={weaponPlaceholderIcon}
                  emptyLabel="No matches"
                  onValueChange={(weaponKey) =>
                    updateCharacter({
                      weaponKey: weaponKey || null,
                      refinement: weaponKey
                        ? item.kind === "character"
                          ? (item.refinement ?? 1)
                          : 1
                        : null,
                    })
                  }
                />
                <ArtifactSelect
                  presentation="slot"
                  items={artifacts}
                  value={artifact?.key ?? ""}
                  label={`Choose artifact for ${character.name}`}
                  placeholder="Search artifact…"
                  placeholderIcon={artifactPlaceholderIcon}
                  emptyLabel="No matches"
                  onValueChange={(artifactKey) =>
                    updateCharacter({ artifactKey: artifactKey || null })
                  }
                />
              </div>
            ) : (
              <div className="col-span-full grid grid-cols-2 gap-1">
                <ArtifactSelect
                  presentation="slot"
                  items={artifacts}
                  value={artifact?.key ?? ""}
                  label={`Choose artifact for ${character.name}`}
                  placeholder="Search artifact…"
                  placeholderIcon={artifactPlaceholderIcon}
                  emptyLabel="No matches"
                  onValueChange={(artifactKey) =>
                    updateCharacter({ artifactKey: artifactKey || null })
                  }
                />
                <WeaponSelect
                  presentation="slot"
                  items={compatibleWeapons}
                  value={weapon?.key ?? ""}
                  label={`Choose weapon for ${character.name}`}
                  placeholder="Search weapon…"
                  placeholderIcon={weaponPlaceholderIcon}
                  emptyLabel="No matches"
                  onValueChange={(weaponKey) =>
                    updateCharacter({
                      weaponKey: weaponKey || null,
                      refinement: weaponKey
                        ? item.kind === "character"
                          ? (item.refinement ?? 1)
                          : 1
                        : null,
                    })
                  }
                />
              </div>
            )}
          </div>
          {teamLayout && item.kind === "character" ? (
            <div className="mt-1 grid grid-cols-2 gap-1">
              <ConstellationSelect
                value={String(item.constellationLevel ?? 0)}
                onValueChange={(next) =>
                  updateCharacter({
                    constellationLevel: Number(next),
                  })
                }
                triggerProps={{
                  size: "sm",
                  className: "h-7 min-w-0 justify-center px-1 text-xs",
                }}
              />
              <RefinementSelect
                disabled={!weapon}
                value={String(item.refinement ?? 1)}
                onValueChange={(next) =>
                  updateCharacter({
                    refinement: Number(next),
                  })
                }
                triggerProps={{
                  size: "sm",
                  className: "h-7 min-w-0 justify-center px-1 text-xs",
                }}
              />
            </div>
          ) : (
            <div className="mt-1.5 flex min-w-0 items-center justify-between gap-1">
              <span className="truncate text-xs font-medium">
                {character.name}
              </span>
              {item.kind === "character" && item.constellationLevel !== null ? (
                <Badge variant="secondary">C{item.constellationLevel}</Badge>
              ) : null}
            </div>
          )}
        </>
      ) : (
        <div className="flex flex-col gap-1 rounded-lg p-1 text-center">
          {item.kind === "weapon" ? (
            <>
              <WeaponSelect
                presentation="slot"
                items={weapons}
                value={item.catalogKey}
                label="Change weapon"
                placeholder="Search weapon…"
                placeholderIcon={weaponPlaceholderIcon}
                emptyLabel="No matches"
                className="rounded-lg border-0"
                onValueChange={(catalogKey) => {
                  if (catalogKey) onChange({ ...item, catalogKey });
                }}
              />
              <span className="truncate text-xs font-medium">
                {weapons.find((entry) => entry.key === item.catalogKey)?.name ??
                  item.catalogKey}
              </span>
            </>
          ) : null}
          {item.kind === "artifact" ? (
            <>
              <ArtifactSelect
                presentation="slot"
                items={artifacts}
                value={item.catalogKey}
                label="Change artifact"
                placeholder="Search artifact…"
                placeholderIcon={artifactPlaceholderIcon}
                emptyLabel="No matches"
                className="rounded-lg border-0"
                onValueChange={(catalogKey) => {
                  if (catalogKey) onChange({ ...item, catalogKey });
                }}
              />
              <span className="truncate text-xs font-medium">
                {artifacts.find((entry) => entry.key === item.catalogKey)
                  ?.name ?? item.catalogKey}
              </span>
            </>
          ) : null}
          {item.kind === "element" ? (
            <>
              {elementSource?.elementIconUrl ? (
                <div className="relative aspect-square w-full overflow-hidden rounded-lg">
                  <Image
                    src={elementSource.elementIconUrl}
                    alt={item.element}
                    fill
                    sizes="128px"
                    className="object-contain p-3"
                    style={{ filter: elementIconFilter(item.element) }}
                  />
                </div>
              ) : null}
              <ElementSelect
                elements={stygianElements}
                iconUrls={elementIconUrls}
                value={item.element}
                onValueChange={(element) =>
                  onChange({
                    ...item,
                    element: element as (typeof stygianElements)[number],
                  })
                }
                triggerProps={{
                  size: "sm",
                  className: "h-7 w-full justify-center px-1 text-xs",
                }}
              />
            </>
          ) : null}
        </div>
      )}
      <Button
        variant="destructive"
        size="icon-xs"
        className="absolute top-2 left-2"
        aria-label="Remove recommendation"
        onClick={onRemove}
      >
        <Trash2Icon />
      </Button>
    </div>
  );
}

function SortableRecommendation({
  id,
  children,
}: {
  id: string;
  children: (dragHandle: ReactNode) => ReactNode;
}) {
  const {
    attributes,
    listeners,
    setNodeRef,
    transform,
    transition,
    isDragging,
  } = useSortable({ id });
  return (
    <div
      ref={setNodeRef}
      style={{ transform: CSS.Transform.toString(transform), transition }}
      className={cn("min-w-0", isDragging && "opacity-60")}
    >
      {children(
        <Button
          type="button"
          variant="ghost"
          size="icon-xs"
          className="touch-none"
          aria-label="Drag to reorder recommendation"
          {...attributes}
          {...listeners}
        >
          <GripVerticalIcon />
        </Button>,
      )}
    </div>
  );
}

function VisualRecommendationGrid({
  items,
  limit,
  onChange,
  characters,
  weapons,
  artifacts,
  teamLayout = false,
  characterOnly = false,
}: {
  items: StygianRecommendationItemInput[];
  limit?: number;
  onChange: (items: StygianRecommendationItemInput[]) => void;
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
  teamLayout?: boolean;
  characterOnly?: boolean;
}) {
  const emptyCount = limit ? Math.max(0, limit - items.length) : 1;
  const sensors = useSensors(
    useSensor(PointerSensor),
    useSensor(KeyboardSensor, {
      coordinateGetter: sortableKeyboardCoordinates,
    }),
  );
  const sortableIds = items.map((item, index) =>
    item.kind === "character"
      ? `character:${item.catalogKey}:${index}`
      : `${item.kind}:${index}`,
  );
  const cards = (
    <div
      className={cn(
        "grid gap-2",
        teamLayout
          ? "grid-cols-4 gap-1 sm:grid-cols-[repeat(4,minmax(0,7.5rem))] sm:gap-2"
          : "grid-cols-[repeat(auto-fill,minmax(6rem,7.5rem))]",
      )}
    >
      {items.map((item, index) => {
        const card = (dragHandle?: ReactNode) => (
          <VisualRecommendation
            key={sortableIds[index]}
            item={item}
            dragHandle={dragHandle}
            teamLayout={teamLayout || characterOnly}
            characters={characters}
            weapons={weapons}
            artifacts={artifacts}
            onChange={(next) =>
              onChange(
                items.map((entry, candidate) =>
                  candidate === index ? next : entry,
                ),
              )
            }
            onRemove={() =>
              onChange(items.filter((_, candidate) => candidate !== index))
            }
          />
        );
        return (
          <SortableRecommendation key={sortableIds[index]} id={sortableIds[index]}>
            {card}
          </SortableRecommendation>
        );
      })}
      {Array.from({ length: emptyCount }, (_, index) =>
        teamLayout || characterOnly ? (
          <AddCharacterSlot
            key={`empty-${index}`}
            characters={characters}
            onAdd={(item) => onChange([...items, item])}
          />
        ) : (
          <AddRecommendationSlot
            key={`empty-${index}`}
            characters={characters}
            weapons={weapons}
            artifacts={artifacts}
            onAdd={(item) => onChange([...items, item])}
          />
        ),
      )}
    </div>
  );
  const handleDragEnd = ({ active, over }: DragEndEvent) => {
    if (!over || active.id === over.id) return;
    const from = sortableIds.indexOf(String(active.id));
    const to = sortableIds.indexOf(String(over.id));
    if (from >= 0 && to >= 0) onChange(arrayMove(items, from, to));
  };
  return (
    <DndContext
      sensors={sensors}
      collisionDetection={closestCenter}
      onDragEnd={handleDragEnd}
    >
      <SortableContext items={sortableIds} strategy={rectSortingStrategy}>
        {cards}
      </SortableContext>
    </DndContext>
  );
}

function SortableTeam({
  id,
  position,
  onCopy,
  children,
}: {
  id: string;
  position: number;
  onCopy: () => void;
  children: ReactNode;
}) {
  const {
    attributes,
    listeners,
    setNodeRef,
    transform,
    transition,
    isDragging,
  } = useSortable({ id, animateLayoutChanges: () => false });
  return (
    <div
      ref={setNodeRef}
      style={{ transform: CSS.Transform.toString(transform), transition }}
      className={cn("min-w-0", isDragging && "relative z-10 opacity-60")}
    >
      <div className="flex h-full flex-col gap-2 rounded-lg border bg-muted/20 p-2">
        <div className="flex items-center justify-between gap-2">
          <span className="text-sm font-medium">Team {position + 1}</span>
          <div className="flex items-center gap-1">
            <Button
              type="button"
              variant="ghost"
              size="icon-xs"
              aria-label={`Copy team ${position + 1}`}
              title="Copy team"
              onClick={onCopy}
            >
              <CopyIcon />
            </Button>
            <Button
              type="button"
              variant="ghost"
              size="icon-xs"
              className="touch-none"
              aria-label={`Drag to reorder team ${position + 1}`}
              {...attributes}
              {...listeners}
            >
              <GripVerticalIcon />
            </Button>
          </div>
        </div>
        {children}
      </div>
    </div>
  );
}

function BossRecommendationEditor({
  scheduleId,
  version,
  level,
  boss,
  recommendations,
  characters,
  weapons,
  artifacts,
  onVersionChange,
}: {
  scheduleId: number;
  version: number;
  level: 105 | 110;
  boss: Boss;
  recommendations: Recommendation[];
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
  onVersionChange: (version: number) => void;
}) {
  const groups = recommendations.filter(
    (group) => group.level === level && group.bossPosition === boss.position,
  );
  const [teams, setTeams] = useState<{ id: string; items: StygianRecommendationItemInput[] }[]>(() =>
    groups
      .filter((group) => group.kind === "team")
      .map((group) => ({ id: group.id, items: group.items.flatMap((item) => toInput(item) ?? []) })),
  );
  const [units, setUnits] = useState<StygianRecommendationItemInput[]>(() =>
    groups
      .filter((group) => group.kind === "unit")
      .flatMap((group) => group.items.flatMap((item) => toInput(item) ?? [])),
  );
  const teamSensors = useSensors(
    useSensor(PointerSensor, { activationConstraint: { distance: 4 } }),
    useSensor(KeyboardSensor, {
      coordinateGetter: sortableKeyboardCoordinates,
    }),
  );
  const teamIds = useMemo(() => teams.map((team) => team.id), [teams]);
  const fingerprint = JSON.stringify({ teams: teams.map((team) => team.items), units });
  const valid = teams.every(
    (team) =>
      team.items.length >= 1 &&
      team.items.length <= 4 &&
      team.items.every((item) => item.kind === "character"),
  );
  const [savedFingerprint, setSavedFingerprint] = useState(fingerprint);
  const savedFingerprintRef = useRef(fingerprint);
  const latestDraftRef = useRef({ fingerprint, valid });
  const [saveStatus, setSaveStatus] = useState<CoordinatorStatus>({ state: "idle" });
  const initialVersionRef = useRef(version);
  const coordinatorRef = useRef<AutosaveCoordinator<
    string,
    { fingerprint: string; expectedVersion: number; teams: StygianRecommendationItemInput[][]; units: StygianRecommendationItemInput[] },
    string
  > | null>(null);
  const saveState = !valid
    ? "incomplete"
    : saveStatus.state === "saving"
      ? "saving"
      : fingerprint === savedFingerprint
        ? "saved"
        : saveStatus.state === "error"
          ? "error"
          : "unsaved";

  useEffect(() => {
    const coordinator = new AutosaveCoordinator({
      initialVersion: initialVersionRef.current,
      debounceMs: 2_500,
      maxRetries: 0,
      createPayload: (draft: string, expectedVersion) => ({
        fingerprint: draft,
        expectedVersion,
        ...JSON.parse(draft) as { teams: StygianRecommendationItemInput[][]; units: StygianRecommendationItemInput[] },
      }),
      save: async ({ fingerprint: draft, ...payload }) => {
        const result = await saveStygianRecommendationsAction(scheduleId, {
          ...payload,
          level,
          bossPosition: boss.position,
        });
        return result.status === "saved"
          ? { status: "saved" as const, version: result.version, snapshot: draft }
          : { status: "transient-error" as const, message: result.message };
      },
      onStatus: (status) => {
        setSaveStatus(status);
        if (status.state === "error") toast.error(status.message);
      },
      onSaved: (draft, savedVersion) => {
        if (draft) {
          savedFingerprintRef.current = draft;
          setSavedFingerprint(draft);
          const latest = latestDraftRef.current;
          if (latest.valid && latest.fingerprint !== draft) coordinator.schedule(latest.fingerprint);
        }
        onVersionChange(savedVersion);
      },
    });
    coordinatorRef.current = coordinator;
    return () => {
      coordinator.dispose();
      coordinatorRef.current = null;
    };
  }, [boss.position, level, onVersionChange, scheduleId]);

  useEffect(() => {
    const coordinator = coordinatorRef.current;
    if (!coordinator) return;
    coordinator.updateVersion(version);
  }, [version]);

  useEffect(() => {
    const coordinator = coordinatorRef.current;
    if (!coordinator) return;
    latestDraftRef.current = { fingerprint, valid };
    if (!valid || fingerprint === savedFingerprintRef.current) coordinator.cancelPending();
    else coordinator.schedule(fingerprint);
  }, [fingerprint, valid]);

  return (
    <StygianBossCard boss={boss} level={level}>
      <FieldSet className="gap-3">
        <FieldLegend className="font-heading text-lg font-semibold">
          Recommended team
        </FieldLegend>
        <DndContext
          sensors={teamSensors}
          collisionDetection={closestCenter}
          onDragEnd={({ active, over }) => {
            if (!over || active.id === over.id) return;
            setTeams((current) => {
              const from = current.findIndex((team) => team.id === active.id);
              const to = current.findIndex((team) => team.id === over.id);
              return from === -1 || to === -1 ? current : arrayMove(current, from, to);
            });
          }}
        >
          <SortableContext
            items={teamIds}
            strategy={rectSortingStrategy}
          >
            <div className="grid grid-cols-1 gap-3 xl:grid-cols-2">
              {teams.map((team, teamIndex) => (
                <SortableTeam
                  key={team.id}
                  id={team.id}
                  position={teamIndex}
                  onCopy={() =>
                    setTeams((current) => {
                      const sourceIndex = current.findIndex((entry) => entry.id === team.id);
                      if (sourceIndex === -1) return current;
                      const source = current[sourceIndex];
                      return current.toSpliced(sourceIndex + 1, 0, {
                        id: crypto.randomUUID(),
                        items: source.items.map((item) => ({ ...item })),
                      });
                    })
                  }
                >
                  <VisualRecommendationGrid
                    items={team.items}
                    limit={4}
                    teamLayout
                    characters={characters}
                    weapons={weapons}
                    artifacts={artifacts}
                    onChange={(items) =>
                      setTeams((current) =>
                        current
                          .map((entry) => entry.id === team.id ? { ...entry, items } : entry)
                          .filter((entry) => entry.items.length),
                      )
                    }
                  />
                  <DeleteConfirmationDialog
                    showSuccessToast={false}
                    trigger={
                      <Button
                        type="button"
                        variant="outline"
                        size="sm"
                        className="self-start"
                      />
                    }
                    type="Team"
                    description="This team and all of its character recommendations will be removed."
                    confirmLabel="Remove team"
                    onConfirm={() =>
                      setTeams((current) => current.filter((entry) => entry.id !== team.id))
                    }
                  >
                    <Trash2Icon data-icon="inline-start" />
                    Remove team
                  </DeleteConfirmationDialog>
                </SortableTeam>
              ))}
            </div>
          </SortableContext>
        </DndContext>
        <Button
          variant="outline"
          size="sm"
          className="self-start"
          onClick={() => setTeams((current) => [...current, { id: crypto.randomUUID(), items: [] }])}
        >
          <PlusIcon data-icon="inline-start" />
          Add team
        </Button>
      </FieldSet>
      <FieldSet className="gap-3">
        <FieldLegend className="font-heading text-lg font-semibold">
          Recommended unit
        </FieldLegend>
        <VisualRecommendationGrid
          items={units}
          characters={characters}
          weapons={weapons}
          artifacts={artifacts}
          onChange={setUnits}
        />
      </FieldSet>
      <div className="flex justify-end">
        <AutosaveStatus
          state={saveState}
          issues={
            valid
              ? []
              : ["Add at least 1 character to each team before autosave."]
          }
          onSave={() => void coordinatorRef.current?.flush()}
        />
      </div>
    </StygianBossCard>
  );
}

export function StygianEditor({
  schedules,
  schedule,
  bosses,
  recommendations,
  characters,
  weapons,
  artifacts,
}: {
  schedules: ScheduleSummary[];
  schedule: ScheduleSummary & { version: number };
  bosses: Boss[];
  recommendations: Recommendation[];
  characters: Character[];
  weapons: CatalogItem[];
  artifacts: CatalogItem[];
}) {
  const [version, setVersion] = useState(schedule.version);
  const [level, setLevel] = useState<105 | 110>(105);
  const [bossPosition, setBossPosition] = useState(0);
  return (
    <div className="flex flex-col gap-6">
      <nav className="flex flex-wrap gap-2" aria-label="Stygian versions">
        {schedules.map((entry) =>
          entry.scheduleId === schedule.scheduleId ? (
            <Button key={entry.scheduleId} disabled variant="secondary" size="sm">
              {entry.challengeName}
            </Button>
          ) : (
            <Button
              key={entry.scheduleId}
              variant="outline"
              size="sm"
              nativeButton={false}
              render={
                <Link href={`/admin/stygian?schedule=${entry.scheduleId}`} />
              }
            >
              {entry.challengeName}
            </Button>
          ),
        )}
        <StygianSyncButton size="sm" />
      </nav>

      <Tabs
        value={String(level)}
        onValueChange={(next) => setLevel(Number(next) as 105 | 110)}
        className="grid grid-cols-1"
      >
        <TabsList className="relative z-10 col-start-1 row-start-2 justify-self-center" aria-label="Stygian difficulty">
          {stygianLevels.map((entry) => (
            <TabsTrigger key={entry} value={String(entry)}>Level {entry}</TabsTrigger>
          ))}
        </TabsList>
        {stygianLevels.map((entry) => (
          <TabsContent key={entry} value={String(entry)} className="col-start-1 row-span-3 row-start-1 grid grid-rows-subgrid">
            <Tabs
              value={String(bossPosition)}
              onValueChange={(next) => setBossPosition(Number(next))}
              className="row-span-3 grid grid-rows-subgrid"
            >
              <TabsList variant="line" className="grid w-full grid-cols-3 overflow-hidden group-data-horizontal/tabs:h-auto group-data-horizontal/tabs:min-h-96" aria-label={`Level ${entry} bosses`}>
                {stygianBossPositions.map((position) => {
                  const boss = bosses.find(
                    (candidate) =>
                      candidate.level === entry &&
                      candidate.position === position,
                  );
                  const label = boss?.name ?? `Boss ${position + 1}`;
                  const positionLabel = stygianBossPositionLabels[position];
                  return (
                    <TabsTrigger
                      key={position}
                      value={String(position)}
                      aria-label={`${positionLabel}: ${label}`}
                      title={label}
                      className="h-full min-w-0 flex-col justify-start overflow-hidden rounded-none px-2 py-3 data-active:bg-accent/50 data-active:ring-2 data-active:ring-primary data-active:ring-inset"
                    >
                      <StygianBossTab
                        boss={boss}
                        position={position}
                        priority={entry === 105}
                      />
                    </TabsTrigger>
                  );
                })}
              </TabsList>
              {bosses
                .filter((boss) => boss.level === entry)
                .map((boss) => (
                  <TabsContent
                    key={boss.position}
                    value={String(boss.position)}
                    className="row-start-3 pt-4"
                  >
                    <BossRecommendationEditor
                      scheduleId={schedule.scheduleId}
                      version={version}
                      level={entry}
                      boss={boss}
                      recommendations={recommendations}
                      characters={characters}
                      weapons={weapons}
                      artifacts={artifacts}
                      onVersionChange={setVersion}
                    />
                  </TabsContent>
                ))}
            </Tabs>
          </TabsContent>
        ))}
      </Tabs>
    </div>
  );
}