export const targetStatOptions = [
  "HP",
  "ATK",
  "DEF",
  "EM",
  "ER",
  "CRIT RATE",
  "CRIT DAMAGE",
] as const;

export type TargetStat = (typeof targetStatOptions)[number];

export const targetStatDefaults: Array<{ stat: TargetStat; value: string }> = [
  { stat: "HP", value: "" },
  { stat: "ATK", value: "" },
  { stat: "DEF", value: "" },
  { stat: "EM", value: "" },
  { stat: "ER", value: "100%" },
  { stat: "CRIT RATE", value: "5%" },
  { stat: "CRIT DAMAGE", value: "50%" },
];

const legacyTargetStatNames: Record<string, TargetStat> = {
  "CRIT Rate": "CRIT RATE",
  "CRIT DMG": "CRIT DAMAGE",
};

export function normalizeTargetStat(value: string): TargetStat | null {
  const normalized = legacyTargetStatNames[value] ?? value;
  return targetStatOptions.includes(normalized as TargetStat)
    ? (normalized as TargetStat)
    : null;
}

export function targetStatIconName(value: string): string | null {
  const stat = normalizeTargetStat(value);
  if (!stat) return null;
  return stat === "CRIT RATE"
    ? "critrate"
    : stat === "CRIT DAMAGE"
      ? "critdmg"
      : stat.toLowerCase();
}

export function recommendedStatIconName(value: string): string | null {
  if (value === "CRIT Rate%/CRIT DMG%") return "critrate";
  if (value === "CRIT Rate%") return "critrate";
  if (value === "CRIT DMG%") return "critdmg";
  if (value === "Healing Bonus%") return "healing-bonus";
  if (value.endsWith(" DMG%")) return "elemental-bonus";

  const base = value.replace(/%$/, "").toLowerCase();
  if (value.endsWith("%") && ["hp", "atk", "def"].includes(base)) return `${base}-percent`;
  return ["hp", "atk", "def", "em", "er"].includes(base) ? base : null;
}

export function recommendedStatOptionConflicts(option: string, selected: readonly string[]): boolean {
  const combined = "CRIT Rate%/CRIT DMG%";
  const individual = ["CRIT Rate%", "CRIT DMG%"];
  return option === combined
    ? individual.some((stat) => selected.includes(stat))
    : individual.includes(option) && selected.includes(combined);
}

export function recommendedStatElement(value: string): string | null {
  const match = /^(Anemo|Geo|Electro|Dendro|Hydro|Pyro|Cryo) DMG%$/u.exec(value);
  return match?.[1] ?? null;
}

export function statPriorityColorClass(index: number): string {
  return index === 0
    ? "text-tier-gold"
    : index === 1
      ? "text-tier-silver"
      : index === 2
        ? "text-tier-copper"
        : "text-foreground";
}