import type { Dispatch, SetStateAction } from "react";
import {
  closestCenter,
  DndContext,
  KeyboardSensor,
  PointerSensor,
  useSensor,
  useSensors,
} from "@dnd-kit/core";
import {
  arrayMove,
  SortableContext,
  sortableKeyboardCoordinates,
  verticalListSortingStrategy,
} from "@dnd-kit/sortable";
import { Form } from "react-router";
import { ListOrdered } from "lucide-react";
import { Button } from "~/components/ui/button";
import { SettingsSection, SettingsStatusPill } from "./SettingsSection";
import { DraftOrderMessage, type SettingsActionData } from "./SettingsMessages";
import { SortableDraftOrderRow } from "./SortableDraftOrderRow";

type DraftOrderTeam = {
  id: string;
  name: string;
  ownerId: string | null;
};

export function DraftOrderSection({
  active,
  draftOrderSet,
  canEditDraftOrder,
  hasUnsavedChanges,
  draftOrderTeams,
  setDraftOrderTeams,
  onDirtyChange,
  onResetChanges,
  teams,
  ownerMap,
  navigationState,
  updateIntent,
  actionData,
}: {
  active: boolean;
  draftOrderSet: boolean;
  canEditDraftOrder: boolean;
  hasUnsavedChanges: boolean;
  draftOrderTeams: string[];
  setDraftOrderTeams: Dispatch<SetStateAction<string[]>>;
  onDirtyChange: (dirty: boolean) => void;
  onResetChanges: () => void;
  teams: DraftOrderTeam[];
  ownerMap: Record<string, string | null>;
  navigationState: "idle" | "loading" | "submitting";
  updateIntent: FormDataEntryValue | null | undefined;
  actionData: SettingsActionData;
}) {
  const sensors = useSensors(
    useSensor(PointerSensor, {
      activationConstraint: { distance: 6 },
    }),
    useSensor(KeyboardSensor, {
      coordinateGetter: sortableKeyboardCoordinates,
    })
  );

  return (
    <SettingsSection
      id="draft-order"
      icon={ListOrdered}
      title="Draft Order"
      description="Drag positions to reorder teams, or randomize the entire draft order. Saved independently from the rest of the settings form."
      status={draftOrderSet ? <SettingsStatusPill tone="success">Set</SettingsStatusPill> : undefined}
      className={active ? undefined : "hidden"}
    >
      {!draftOrderSet && (
        <div className="space-y-3">
          <div className="rounded-lg border border-amber-500/40 bg-amber-500/10 p-4">
            <p className="text-sm font-medium text-amber-700 dark:text-amber-300">
              The draft cannot begin until a draft order is set.
            </p>
            <p className="mt-1 text-sm text-amber-600 dark:text-amber-400">
              Randomize the order now, or drag and drop teams into position manually below.
            </p>
          </div>
          {canEditDraftOrder && (
            <Form method="post">
              <input type="hidden" name="intent" value="randomize-draft-order" />
              <Button type="submit" className="w-full" disabled={navigationState === "submitting" && updateIntent === "randomize-draft-order"}>
                {navigationState === "submitting" && updateIntent === "randomize-draft-order" ? "Randomizing..." : "Randomize Draft Order"}
              </Button>
            </Form>
          )}
        </div>
      )}
      <div>
        <h3 className="mb-3 text-sm font-semibold text-muted-foreground">Manually set draft order</h3>
        <Form method="post" className="space-y-3">
          <input type="hidden" name="intent" value="set-draft-order" />
          <DndContext
            sensors={sensors}
            collisionDetection={closestCenter}
            onDragEnd={({ active: activeItem, over }) => {
              if (!over || activeItem.id === over.id) return;

              setDraftOrderTeams((current) => {
                const oldIndex = current.indexOf(String(activeItem.id));
                const newIndex = current.indexOf(String(over.id));
                if (oldIndex === -1 || newIndex === -1) return current;
                onDirtyChange(true);
                return arrayMove(current, oldIndex, newIndex);
              });
            }}
          >
            <SortableContext items={draftOrderTeams} strategy={verticalListSortingStrategy}>
              <div className="space-y-3">
                {draftOrderTeams.map((teamId, index) => {
                  const team = teams.find((t) => t.id === teamId);
                  if (!team) return null;

                  return (
                    <SortableDraftOrderRow
                      key={teamId}
                      teamId={teamId}
                      index={index}
                      teamName={team.name}
                      ownerName={team.ownerId ? (ownerMap[team.ownerId] ?? "Unknown") : null}
                      disabled={!canEditDraftOrder}
                    />
                  );
                })}
              </div>
            </SortableContext>
          </DndContext>
          {canEditDraftOrder ? (
            <div className="rounded-xl border bg-card p-3">
              {hasUnsavedChanges && (
                <p className="mb-3 text-sm font-medium text-amber-700 dark:text-amber-300">
                  You have unsaved draft order changes.
                </p>
              )}
              <div className="flex flex-col gap-2 sm:flex-row">
                {hasUnsavedChanges && (
                  <Button type="button" variant="outline" className="sm:w-48" onClick={onResetChanges}>
                    Reset Changes
                  </Button>
                )}
                <Button type="submit" className="flex-1" disabled={navigationState === "submitting" && updateIntent === "set-draft-order"}>
                  {navigationState === "submitting" && updateIntent === "set-draft-order" ? "Saving..." : "Save Draft Order"}
                </Button>
              </div>
            </div>
          ) : (
            <p className="text-sm text-muted-foreground">Draft order cannot be changed after the draft has started.</p>
          )}
        </Form>
      </div>
      {draftOrderSet && canEditDraftOrder && (
        <Form method="post">
          <input type="hidden" name="intent" value="randomize-draft-order" />
          <Button type="submit" variant="outline" className="w-full" disabled={navigationState === "submitting" && updateIntent === "randomize-draft-order"}>
            {navigationState === "submitting" && updateIntent === "randomize-draft-order" ? "Randomizing..." : "Randomize Draft Order"}
          </Button>
        </Form>
      )}
      <DraftOrderMessage actionData={actionData} />
    </SettingsSection>
  );
}