import { useMemo } from "react";
import { classById } from "../app/characterCatalog";
import { abilityAtLevel, type AbilityDefinition } from "../game/abilityCatalog";
import { useCombatStore } from "../game/combatStore";
import { useGameStore } from "../game/store";
import { useMenuController, type MenuAction } from "../input/useMenuController";
import { ControllerButton } from "./ControllerButton";

const GROUPS = [
  { id: "primary", label: "Primary" },
  { id: "general", label: "Secondary General" },
  { id: "elite", label: "Elite" },
  { id: "passive", label: "Passive" },
] as const;

function visibleGroup(ability: AbilityDefinition, primaryClassId: string): (typeof GROUPS)[number]["id"] {
  if (ability.passive) return "passive";
  if (ability.romSkillGroup === "elite") return "elite";
  if (ability.classId !== primaryClassId) return "general";
  return "primary";
}

export function RomSkillsPanel({ open, onClose }: { open?: boolean; onClose?: () => void } = {}) {
  const storeOpen = useGameStore((state) => state.overlay === "talents");
  const closeOverlay = useGameStore((state) => state.closeOverlay);
  const close = onClose ?? closeOverlay;
  const classId = useCombatStore((state) => state.classId);
  const secondaryClassId = useCombatStore((state) => state.secondaryClassId);
  const level = useCombatStore((state) => state.level);
  const abilities = useCombatStore((state) => state.abilities);
  const actions = useMemo<MenuAction[]>(() => [
    ...abilities.map((ability) => ({ id: `rom-skill-${ability.id}`, run: () => undefined })),
    { id: "rom-skills-close", run: close },
  ], [abilities, close]);
  const controller = useMenuController(actions, { initialId: abilities[0] ? `rom-skill-${abilities[0].id}` : "rom-skills-close", onBack: close });
  if (!(open ?? storeOpen)) return null;

  const primary = classById(classId);
  const secondary = secondaryClassId ? classById(secondaryClassId) : null;
  return (
    <div className="modal-backdrop game-panel-backdrop" role="presentation">
      <section className="game-panel rom-skills-panel" role="dialog" aria-modal="true" aria-labelledby="rom-skills-title">
        <header className="game-panel__header"><div><p>Runes of Magic / Automatic progression</p><h2 id="rom-skills-title">Skills</h2></div><ControllerButton controlId="rom-skills-close" selectedId={controller.selectedId} select={controller.select} type="button" onClick={close}>Close</ControllerButton></header>
        <p className="rom-skills-panel__intro"><strong>{primary.name}{secondary ? ` / ${secondary.name}` : ""}</strong><span>Skills unlock automatically as you level. There are no talent points or spell ranks to assign.</span></p>
        <div className="rom-skills-groups">
          {GROUPS.filter((group) => abilities.some((ability) => visibleGroup(ability, classId) === group.id)).map((group) => {
            const entries = abilities.filter((ability) => visibleGroup(ability, classId) === group.id);
            return <section key={group.id}><header><h3>{group.label}</h3><span>{entries.filter((ability) => level >= ability.unlockLevel).length} / {entries.length}</span></header><div>{entries.map((catalogAbility) => { const ability = abilityAtLevel(catalogAbility, level); const locked = level < catalogAbility.unlockLevel; return <ControllerButton key={ability.id} controlId={`rom-skill-${ability.id}`} selectedId={controller.selectedId} select={controller.select} className={`rom-skill-card ${locked ? "is-locked" : ""}`} type="button"><img src={ability.icon} alt=""/><span><strong>{ability.name}</strong><small>{locked ? `Unlocks at level ${ability.unlockLevel}` : ability.secondaryClassId ? `Elite / ${secondary?.name ?? "Secondary class"}` : "Learned"}</small></span><em>{ability.passive ? "Passive" : ability.cost.amount ? `${ability.cost.amount} ${ability.cost.resource}` : "No cost"}</em></ControllerButton>; })}</div></section>;
          })}
        </div>
      </section>
    </div>
  );
}