import { analyzeStorage } from "../core/analyzer.js";
import { isMediaPath, normalizePath } from "../core/path-utils.js";

async function* walkFilePicker(storage, target = "", onProgress = null) {
  onProgress?.({ phase: "files", label: format("KSA.Progress.BrowseStorage", { storage, path: target || "/" }) });
  const result = await FilePicker.browse(storage, target);
  for (const file of result.files ?? []) {
    const path = normalizePath(file);
    if (!isMediaPath(path)) continue;
    yield { storage, path };
  }
  for (const directory of result.dirs ?? []) {
    const path = normalizePath(directory);
    yield* walkFilePicker(storage, path, onProgress);
  }
}

async function* listFoundryFiles(onProgress = null) {
  for (const storage of ["data", "public"]) {
    if (!game.data.files.storages.includes(storage)) continue;
    yield* walkFilePicker(storage, "", onProgress);
  }
}

function worldCollectionEntries() {
  if (!game.world) return [];
  const entries = [];
  for (const collection of game.collections ?? []) {
    const collectionDocumentName = collection.documentName ?? null;
    if (collectionDocumentName === "ChatMessage") continue;
    const docs = Array.from(collection.values?.() ?? []);
    for (const doc of docs) {
      entries.push({
        sourceType: "world-document",
        sourceScope: {
          ownerType: "world",
          ownerId: game.world.id,
          systemId: game.world.system,
          subtype: doc.documentName?.toLowerCase() ?? collectionDocumentName?.toLowerCase() ?? "document"
        },
        sourceLabel: `${doc.documentName ?? "Document"} ${doc.id}`,
        sourceName: doc.name ?? null,
        sourceUuid: doc.uuid ?? null,
        resolveSourceTrail: candidatePath => resolveSourceTrail(doc, candidatePath),
        value: doc.toObject ? doc.toObject() : doc
      });
    }
  }
  return entries;
}

function packageMetadataEntries() {
  const entries = [];
  for (const module of game.modules.values()) {
    entries.push({
      sourceType: "module-manifest",
      sourceScope: { ownerType: "module", ownerId: module.id, subtype: "manifest" },
      sourceLabel: `module.json ${module.id}`,
      value: module.toObject ? module.toObject() : module
    });
  }
  if (game.system) {
    entries.push({
      sourceType: "system-manifest",
      sourceScope: { ownerType: "system", ownerId: game.system.id, subtype: "manifest" },
      sourceLabel: `system.json ${game.system.id}`,
      value: game.system.toObject ? game.system.toObject() : game.system
    });
  }
  if (game.world) {
    entries.push({
      sourceType: "world-manifest",
      sourceScope: { ownerType: "world", ownerId: game.world.id, systemId: game.world.system, subtype: "manifest" },
      sourceLabel: `world.json ${game.world.id}`,
      value: game.world.toObject ? game.world.toObject() : game.world
    });
  }
  return entries;
}

async function* packagePackEntries(onProgress = null) {
  for (const pack of game.packs.values()) {
    const ownerType = pack.metadata.packageType;
    const ownerId = pack.metadata.packageName;
    if (!["module", "system"].includes(ownerType) || !ownerId) continue;
    onProgress?.({ phase: "sources", label: format("KSA.Progress.ReadPack", { pack: pack.collection }), currentSource: pack.collection });
    const documents = await pack.getDocuments();
    for (const document of documents) {
      yield {
        sourceType: "package-pack-document",
        sourceScope: {
          ownerType,
          ownerId,
          subtype: `pack:${pack.collection}`
        },
        sourceLabel: `${pack.collection} ${document.id}`,
        sourceName: document.name ?? null,
        sourceUuid: document.uuid ?? null,
        resolveSourceTrail: candidatePath => resolveSourceTrail(document, candidatePath),
        value: document.toObject ? document.toObject() : document
      };
    }
  }
}

async function* listFoundrySources(onProgress = null) {
  yield* worldCollectionEntries();
  yield* packageMetadataEntries();
  yield* packagePackEntries(onProgress);
}

export async function runRuntimeAnalysis({ onProgress }={}) {
  return analyzeStorage({
    listFiles: () => listFoundryFiles(onProgress),
    listSources: () => listFoundrySources(onProgress),
    onProgress,
    i18n: { format }
  });
}

function format(key, data) {
  return game.i18n?.format(key, data) ?? key;
}

function resolveSourceTrail(document, candidatePath = []) {
  const trail = [createTrailNode(document.uuid, document.name ?? `${document.documentName ?? "Document"} ${document.id}`)];
  const path = Array.isArray(candidatePath) ? candidatePath : [];
  if (!path.length) return trail;

  if (document.documentName === "Actor") {
    const itemNode = resolveActorItemTrail(document, path);
    if (itemNode) trail.push(itemNode);
    return trail;
  }

  if (document.documentName === "Scene") {
    const sceneTrail = resolveSceneTrail(document, path);
    if (sceneTrail.length) trail.push(...sceneTrail);
  }

  return trail;
}

function resolveActorItemTrail(actor, path) {
  if ((path[0] !== "items") || !Number.isInteger(path[1])) return null;
  const itemData = actor.items?.contents?.[path[1]] ?? actor.toObject?.().items?.[path[1]] ?? null;
  const itemId = itemData?.id ?? itemData?._id ?? null;
  if (!itemId) return null;
  const itemName = itemData?.name ?? `Item ${itemId}`;
  return createTrailNode(`${actor.uuid}.Item.${itemId}`, itemName);
}

function resolveSceneTrail(scene, path) {
  if ((path[0] !== "tokens") || !Number.isInteger(path[1])) return [];
  const token = scene.tokens?.contents?.[path[1]] ?? scene.toObject?.().tokens?.[path[1]] ?? null;
  const actorId = token?.actorId ?? token?.actor?.id ?? null;
  const actor = actorId ? game.actors?.get(actorId) ?? null : null;
  if (!actor) return [];

  const trail = [createTrailNode(actor.uuid, actor.name ?? `Actor ${actor.id}`)];

  const itemPath = extractTokenItemPath(path);
  if (!itemPath) return trail;

  const tokenData = scene.toObject?.().tokens?.[path[1]] ?? null;
  const itemData = resolveTokenItemData(tokenData, itemPath.itemIndex);
  const itemId = itemData?._id ?? itemData?.id ?? null;
  if (!itemId) return trail;

  trail.push(createTrailNode(`${actor.uuid}.Item.${itemId}`, itemData?.name ?? `Item ${itemId}`));
  return trail;
}

function extractTokenItemPath(path) {
  if ((path[2] === "actorData") && (path[3] === "items") && Number.isInteger(path[4])) {
    return { itemIndex: path[4] };
  }
  if ((path[2] === "delta") && (path[3] === "items") && Number.isInteger(path[4])) {
    return { itemIndex: path[4] };
  }
  return null;
}

function resolveTokenItemData(tokenData, itemIndex) {
  if (!tokenData || !Number.isInteger(itemIndex)) return null;
  if (Array.isArray(tokenData.actorData?.items)) return tokenData.actorData.items[itemIndex] ?? null;
  if (Array.isArray(tokenData.delta?.items)) return tokenData.delta.items[itemIndex] ?? null;
  return null;
}

function createTrailNode(uuid, label) {
  return { uuid, label };
}