import { classifyRisk, createCanonicalLocator, detectMediaKind, inferOwnerHint, isCorePublicPath, isStorageAreaPath } from "./path-utils.js";

function compareOwner(sourceScope, targetOwner) {
  if (!sourceScope) return "unknown";
  if ((sourceScope.ownerType === "world") && (targetOwner.ownerType === "system") && (sourceScope.systemId === targetOwner.ownerId)) {
    return "same-system";
  }
  if ((sourceScope.ownerType === "world") && (targetOwner.ownerType === "public") &&
      ["cards", "icons", "nue", "sounds", "ui"].includes(targetOwner.ownerId)) {
    return "core-public";
  }
  if ((sourceScope.ownerType === "module") && (targetOwner.ownerType === "module")) {
    return sourceScope.ownerId === targetOwner.ownerId ? "same-package" : "foreign-module";
  }
  if ((sourceScope.ownerType === "system") && (targetOwner.ownerType === "system")) {
    return sourceScope.ownerId === targetOwner.ownerId ? "same-package" : "cross-package";
  }
  if ((sourceScope.ownerType === "world") && (targetOwner.ownerType === "world")) {
    return sourceScope.ownerId === targetOwner.ownerId ? "same-world" : "cross-world";
  }
  if ((sourceScope.ownerType === "world") && ((targetOwner.ownerType === "module") || (targetOwner.ownerType === "system"))) {
    return "non-package-to-package";
  }
  if ((sourceScope.ownerType === "world") && (targetOwner.ownerType === "public")) {
    return "risky-public";
  }
  if (((sourceScope.ownerType === "module") || (sourceScope.ownerType === "system")) &&
      ((targetOwner.ownerType === "module") || (targetOwner.ownerType === "system")) &&
      ((sourceScope.ownerType !== targetOwner.ownerType) || (sourceScope.ownerId !== targetOwner.ownerId))) {
    return "cross-package";
  }
  return "allowed";
}

export function buildFindings({ files, references, i18n }={}) {
  const fileByLocator = new Map(files.map(file => [createCanonicalLocator(file.storage, file.path), file]));
  const fileLocators = files.map(file => ({
    storage: file.storage,
    path: file.path,
    locator: createCanonicalLocator(file.storage, file.path)
  }));
  const resolvedReferences = references.map(reference => resolveReferenceTarget(reference, fileByLocator, fileLocators));
  const refsByLocator = new Map();
  const wildcardReferences = [];
  const findings = [];

  for (const reference of resolvedReferences) {
    const normalized = reference.normalized;
    if (!normalized) continue;
    if (normalized.targetKind === "wildcard") {
      wildcardReferences.push(reference);
      continue;
    }
    const normalizedLocator = createCanonicalLocator(normalized.storage, normalized.path);
    const bucket = refsByLocator.get(normalizedLocator) ?? [];
    bucket.push(reference);
    refsByLocator.set(normalizedLocator, bucket);
  }

  for (const reference of resolvedReferences) {
    const normalized = reference.normalized;
    if (!normalized) continue;
    const normalizedLocator = createCanonicalLocator(normalized.storage, normalized.path);

    const file = fileByLocator.get(normalizedLocator);
    if (!file) {
      if ((normalized.targetKind === "wildcard") && wildcardMatchesAny(normalized, fileLocators)) continue;
      if (reference.sourceScope?.ownerType !== "world") continue;
      findings.push({
        kind: "broken-reference",
        severity: reference.sourceScope?.ownerType === "world" ? "high" : "warning",
        target: { ...normalized, locator: normalizedLocator },
        source: reference,
        reason: normalized.targetKind === "wildcard"
          ? format(i18n, "KSA.FindingReason.BrokenWildcard", { locator: normalized.locator })
          : format(i18n, "KSA.FindingReason.BrokenReference", { locator: normalized.locator }),
        recommendation: normalized.targetKind === "wildcard"
          ? format(i18n, "KSA.FindingRecommendation.CheckWildcard")
          : format(i18n, "KSA.FindingRecommendation.CheckMissingFile"),
        confidence: "high"
      });
      continue;
    }

    const ownerRelation = compareOwner(reference.sourceScope, file.ownerHint);
    if (ownerRelation === "non-package-to-package") {
      if (isAnchoredInOwningPackage(file, matchingReferencesForFile(file, refsByLocator, wildcardReferences))) continue;
      findings.push({
        kind: "non-package-to-package-reference",
        severity: "high",
        target: { ...normalized, locator: normalizedLocator },
        source: reference,
        reason: format(i18n, "KSA.FindingReason.UnanchoredPackageTarget", {
          sourceOwner: `${reference.sourceScope.ownerType}:${reference.sourceScope.ownerId}`,
          locator: normalized.locator
        }),
        recommendation: format(i18n, "KSA.FindingRecommendation.MoveToStableStorage"),
        confidence: "high"
      });
    } else if (ownerRelation === "risky-public") {
      if (reference.sourceScope?.ownerType !== "world") continue;
      findings.push({
        kind: "risky-public-reference",
        severity: "high",
        target: { ...normalized, locator: normalizedLocator },
        source: reference,
        reason: format(i18n, "KSA.FindingReason.RiskyPublicTarget", {
          sourceOwner: `${reference.sourceScope.ownerType}:${reference.sourceScope.ownerId}`,
          locator: normalized.locator
        }),
        recommendation: format(i18n, "KSA.FindingRecommendation.CopyToStableStorage"),
        confidence: "high"
      });
    }
  }

  for (const file of files) {
    if (detectMediaKind(file.path) === "other") continue;
    const refs = matchingReferencesForFile(file, refsByLocator, wildcardReferences);
    if (refs.length) continue;
    if (!shouldReportOrphan(file, resolvedReferences)) continue;

    const severity = (file.riskClass === "package-module") || (file.riskClass === "package-system") || (file.riskClass === "release-public")
      ? "warning"
      : "info";

    findings.push({
      kind: "orphan-file",
      severity,
      target: file,
      source: null,
      reason: format(i18n, "KSA.FindingReason.OrphanFile", { locator: file.locator }),
      recommendation: severity === "warning"
        ? format(i18n, "KSA.FindingRecommendation.ReviewOrMoveOrphan")
        : format(i18n, "KSA.FindingRecommendation.KeepAsReserve"),
      confidence: "medium"
    });
  }

  return findings;
}

function resolveReferenceTarget(reference, fileByLocator, fileLocators) {
  const normalized = reference.normalized;
  if (!normalized) return reference;

  const currentLocator = createCanonicalLocator(normalized.storage, normalized.path);
  if (fileByLocator.has(currentLocator)) return reference;

  const alternateStorage = normalized.storage === "data"
    ? "public"
    : normalized.storage === "public"
      ? "data"
      : null;
  if (!alternateStorage) return reference;

  const alternateLocator = createCanonicalLocator(alternateStorage, normalized.path);
  if (normalized.targetKind === "wildcard") {
    const alternateTarget = { ...normalized, storage: alternateStorage, locator: alternateLocator };
    if (!wildcardMatchesAny(alternateTarget, fileLocators)) return reference;
    return {
      ...reference,
      normalized: alternateTarget
    };
  }

  if (!fileByLocator.has(alternateLocator)) return reference;
  return {
    ...reference,
    normalized: {
      ...normalized,
      storage: alternateStorage,
      locator: alternateLocator
    }
  };
}

function isAnchoredInOwningPackage(file, references) {
  const ownerType = file.ownerHint.ownerType;
  const ownerId = file.ownerHint.ownerId;
  if (!["module", "system"].includes(ownerType) || !ownerId) return false;
  return references.some(reference =>
    (reference.sourceScope?.ownerType === ownerType) &&
    (reference.sourceScope?.ownerId === ownerId)
  );
}

function matchingReferencesForFile(file, refsByLocator, wildcardReferences) {
  const exactRefs = refsByLocator.get(createCanonicalLocator(file.storage, file.path)) ?? [];
  const matchingWildcardRefs = wildcardReferences.filter(reference => wildcardMatchesFile(reference.normalized, file));
  return [...exactRefs, ...matchingWildcardRefs];
}

function wildcardMatchesAny(target, fileLocators) {
  const matcher = wildcardToRegExp(target.path);
  return fileLocators.some(file => file.storage === target.storage && matcher.test(file.path));
}

function wildcardMatchesFile(target, file) {
  if (!target || (target.targetKind !== "wildcard")) return false;
  if (target.storage !== file.storage) return false;
  return wildcardToRegExp(target.path).test(file.path);
}

function wildcardToRegExp(pattern) {
  const escaped = String(pattern)
    .replace(/[.+^${}()|\\]/g, "\\$&")
    .replace(/\*/g, ".*")
    .replace(/\?/g, ".");
  return new RegExp(`^${escaped}$`, "u");
}

function shouldReportOrphan(file, references) {
  if (isDerivedSceneThumbnail(file)) return false;
  if (file.riskClass === "stable-world") {
    const worldId = file.ownerHint.ownerId;
    return references.some(reference => reference.sourceScope?.ownerType === "world" && reference.sourceScope.ownerId === worldId);
  }
  if ((file.riskClass === "package-module") || (file.riskClass === "package-system")) {
    return isStorageAreaPath(file);
  }
  if (file.riskClass === "release-public") {
    return !isCorePublicPath(file);
  }
  return false;
}

function isDerivedSceneThumbnail(file) {
  const path = String(file.path ?? "");
  return /^worlds\/[^/]+\/assets\/scenes\/[^/]+-thumb\.(?:png|webp)$/u.test(path);
}

export function createFileRecord(locator, size = null) {
  return {
    ...locator,
    basename: locator.path.split("/").pop() ?? locator.path,
    extension: locator.path.includes(".") ? locator.path.split(".").pop().toLowerCase() : "",
    size,
    mediaKind: detectMediaKind(locator.path),
    ownerHint: inferOwnerHint(locator),
    riskClass: classifyRisk(locator),
    exists: true
  };
}

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