import type { ClassId } from "../app/characterCatalog";
import generated from "./generated/partyTalentRuntimePlans.json";

type TalentRanks = Readonly<Record<string, number>>;

export interface PartyTalentRuntimeMilestone {
  readonly level: number;
  readonly link: string;
}

export interface PartyTalentRuntimeLevelPlan {
  readonly minimumLevel: number;
  readonly sourceLevels: readonly number[];
  readonly sourcePointCount: number;
  readonly sourcePointFlags: readonly boolean[];
  readonly plan: readonly string[];
}

export interface PartyTalentRuntimeProfile {
  readonly id: string;
  readonly classId: ClassId;
  readonly specialization: string;
  readonly name: string;
  readonly characterName: string;
  readonly source: "azerothcore-playerbots" | "healer-man-generated";
  readonly sourceVersion: string;
  readonly defaultForSpecialization: boolean;
  readonly playerbotsSpecName: string | null;
  readonly milestones: readonly PartyTalentRuntimeMilestone[];
  readonly sourcePointCount: number | null;
  readonly sourcePointsRetained: number | null;
  readonly fallbackPointCount: number;
  readonly plan: readonly string[];
  readonly levelPlans: readonly PartyTalentRuntimeLevelPlan[];
}

export interface PartyTalentRuntimeProvenance {
  readonly sourcePointCount: number | null;
  readonly sourcePointsRetained: number | null;
  readonly fallbackPointCount: number;
  readonly sourceLevels: readonly number[];
}

interface PartyTalentRuntimeSnapshot {
  readonly schemaVersion: 2;
  readonly playerbotsCommit: string;
  readonly profiles: readonly PartyTalentRuntimeProfile[];
}

const snapshot = generated as PartyTalentRuntimeSnapshot;
const profileById = new Map(snapshot.profiles.map((profile) => [profile.id, profile]));

function planKey(classId: ClassId, specialization: string): string {
  return `${classId}:${specialization}`;
}

export function runtimePartyTalentPlan(
  classId: ClassId,
  specialization: string,
  profileId?: string,
): readonly string[] {
  return runtimePartyTalentProfile(classId, specialization, profileId).plan;
}

export function runtimePartyTalentProfiles(
  classId: ClassId,
  specialization: string,
): readonly PartyTalentRuntimeProfile[] {
  const key = planKey(classId, specialization);
  return snapshot.profiles.filter((profile) => planKey(profile.classId, profile.specialization) === key);
}

export function runtimePartyTalentProfile(
  classId: ClassId,
  specialization: string,
  profileId?: string,
): PartyTalentRuntimeProfile {
  const profiles = runtimePartyTalentProfiles(classId, specialization);
  const profile = profileId
    ? profileById.get(profileId)
    : profiles.find((candidate) => candidate.defaultForSpecialization);
  if (!profile || profile.classId !== classId || profile.specialization !== specialization) {
    throw new Error(`Unsupported party talent profile: ${classId}:${specialization}:${profileId ?? "default"}`);
  }
  return profile;
}

export function runtimeDefaultPartyTalentProfile(
  classId: ClassId,
  specialization: string,
): PartyTalentRuntimeProfile {
  return runtimePartyTalentProfile(classId, specialization);
}

function levelPlanFor(
  profile: PartyTalentRuntimeProfile,
  level: number,
): PartyTalentRuntimeLevelPlan | null {
  const safeLevel = Number.isFinite(level) ? Math.max(1, Math.min(80, Math.trunc(level))) : 1;
  return [...profile.levelPlans]
    .reverse()
    .find((candidate) => candidate.minimumLevel <= safeLevel) ?? null;
}

export function runtimePartyTalentProvenanceForLevel(
  profile: PartyTalentRuntimeProfile,
  level: number,
): PartyTalentRuntimeProvenance {
  const selected = levelPlanFor(profile, level);
  if (!selected) {
    return {
      sourcePointCount: profile.sourcePointCount,
      sourcePointsRetained: profile.sourcePointsRetained,
      fallbackPointCount: profile.fallbackPointCount,
      sourceLevels: [],
    };
  }
  const safeLevel = Number.isFinite(level) ? Math.max(1, Math.min(80, Math.trunc(level))) : 1;
  const points = Math.max(0, safeLevel - 9);
  const sourcePointsRetained = selected.sourcePointFlags.slice(0, points).filter(Boolean).length;
  return {
    sourcePointCount: selected.sourcePointCount,
    sourcePointsRetained,
    fallbackPointCount: Math.max(0, points - sourcePointsRetained),
    sourceLevels: selected.sourceLevels,
  };
}

/** Runtime-only projection of the catalog-validated 71-point party plans. */
export function runtimePartyTalentRanksForLevel(
  classId: ClassId,
  specialization: string,
  level: number,
  profileId?: string,
): TalentRanks {
  const safeLevel = Number.isFinite(level) ? Math.max(1, Math.min(80, Math.trunc(level))) : 1;
  const profile = runtimePartyTalentProfile(classId, specialization, profileId);
  const plan = levelPlanFor(profile, safeLevel)?.plan ?? profile.plan;
  const points = Math.max(0, safeLevel - 9);
  const ranks: Record<string, number> = {};
  for (const nodeId of plan.slice(0, points)) ranks[nodeId] = (ranks[nodeId] ?? 0) + 1;
  return Object.freeze(ranks);
}