import { StudioGatewayError } from "../../application/ports/studio-gateway-error.ts";
import type { IdempotentOptions, RequestOptions, StudioGateway } from "../../application/ports/studio-gateway.ts";
import type { components } from "../../contracts/studio/generated.ts";
import type { Asset, CatalogPage, DocumentPage, PreviewDetail, ProblemDetails, PublicationAggregate, PublicationEvent, PublicationListItem, PublicationPage, PublicPreview, PublishResult, StudioDashboard, WorkingCopy, WorkingCopyDetail, WorkingCopyInput } from "../../contracts/studio/contract.ts";
import { deriveDocumentState, derivePreviewState } from "../../domain/studio/document-state.ts";
import { cursorBinding, decodeCursor, encodeCursor } from "./cursor.ts";
import { createMockStudioState, MockStudioState } from "./mock-state.ts";
import { projectWorkingCopy } from "./project-public-render-model.ts";
import { stableStringify } from "../stable-stringify.ts";
import { validateWorkingCopy, validateWorkingCopyInputStructure } from "./validate-working-copy.ts";

export { createMockStudioState } from "./mock-state.ts";

export type MockStudioDependencies = {
  clock: { now(): Date };
  idGenerator: { next(): string };
  dependencyRevision: { current(): string };
  /**
   * Fix round 1 (I2). Shared with a sibling `createMockStudioAssetGateway`
   * (same `Map` reference) by `create-tech-log-feature-input.ts` so the two
   * mock gateways agree on which evidence keys exist. Defaults to a private,
   * empty map -- existing direct callers (tests) that never supply one keep
   * seeing exactly today's behavior.
   */
  assets: ReadonlyMap<string, Asset>;
};

export const DEFAULT_STUDIO_MOCK_NOW = "2026-08-14T01:00:00.000Z";
const CONTENT_FORMAT_VERSION = "1";
const RENDERER_CONTRACT_VERSION = "1";

const UUID = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
const cp = (value: string) => [...value].length;
const clone = <T>(value: T): T => structuredClone(value);
const normalizeQ = (value?: string) => (value ?? "").trim().replace(/\s+/g, " ").toLocaleLowerCase("ko-KR");

function defaults(): MockStudioDependencies {
  let id = 5000;
  return { clock: { now: () => new Date(DEFAULT_STUDIO_MOCK_NOW) }, idGenerator: { next: () => `aaaaaaaa-aaaa-4aaa-8aaa-${String(id++).padStart(12, "0")}` }, dependencyRevision: { current: () => "catalog-2026-08-14" }, assets: new Map() };
}

function gatewayProblem(status: number, code: ProblemDetails["code"], detail: string, extras: Partial<ProblemDetails> = {}) {
  return new StudioGatewayError({ type: `https://techlog.local/problems/${code.toLowerCase().replaceAll("_", "-")}`, title: code, status, detail, code, retryable: false, ...extras });
}

function requestError(fieldErrors: components["schemas"]["FieldError"][]) {
  return gatewayProblem(422, "REQUEST_VALIDATION_FAILED", "Request fields are invalid.", { fieldErrors });
}

function inputOf(document: WorkingCopy): WorkingCopyInput {
  const { id, version, updatedAt, ...input } = document;
  void id; void version; void updatedAt;
  return input;
}

function limitOf(value?: number) {
  const limit = value ?? 20;
  if (!Number.isInteger(limit) || limit < 1 || limit > 100) throw requestError([{ path: "/limit", message: "Limit must be 1-100." }]);
  return limit;
}

function uuid(value: unknown, path: string): asserts value is string {
  if (typeof value !== "string" || !UUID.test(value)) throw requestError([{ path, message: "Must be a UUID." }]);
}

function exactSet(left: string[], right: string[]) {
  return new Set(left).size === left.length && new Set(right).size === right.length && [...left].sort().join("\0") === [...right].sort().join("\0");
}

export function createMockStudioGateway(supplied: Partial<MockStudioDependencies> = {}): StudioGateway {
  const fallback = defaults();
  const dependencies: MockStudioDependencies = { clock: supplied.clock ?? fallback.clock, idGenerator: supplied.idGenerator ?? fallback.idGenerator, dependencyRevision: supplied.dependencyRevision ?? fallback.dependencyRevision, assets: supplied.assets ?? fallback.assets };
  const state: MockStudioState = createMockStudioState();

  async function boundary(options?: RequestOptions) {
    options?.signal?.throwIfAborted(); await Promise.resolve(); options?.signal?.throwIfAborted();
  }
  async function read<T>(options: RequestOptions | undefined, work: () => T) { await boundary(options); return clone(work()); }
  async function idempotent<T>(operation: string, target: string, request: () => unknown, options: IdempotentOptions, work: () => T): Promise<T> {
    await boundary(options);
    if (typeof options.idempotencyKey !== "string" || cp(options.idempotencyKey) < 1 || cp(options.idempotencyKey) > 200) throw requestError([{ path: "/idempotencyKey", message: "Idempotency key must be 1-200 characters." }]);
    const key = `${operation}:${target}:${options.idempotencyKey}`; const fingerprint = stableStringify(request()); const prior = state.idempotency.get(key);
    if (prior) {
      if (prior.fingerprint !== fingerprint) throw gatewayProblem(409, "IDEMPOTENCY_KEY_REUSED", "The key was used with a different request.");
      if (prior.outcome.kind === "problem") throw new StudioGatewayError(clone(prior.outcome.problem));
      return clone(prior.outcome.value as T);
    }
    try { const value = work(); state.idempotency.set(key, { fingerprint, outcome: { kind: "success", value: clone(value) } }); return clone(value); }
    catch (error) { if (error instanceof StudioGatewayError) { state.idempotency.set(key, { fingerprint, outcome: { kind: "problem", problem: clone(error.problem) } }); throw new StudioGatewayError(clone(error.problem)); } throw error; }
  }

  const document = (id: string) => { const value = state.documents.get(id); if (!value) throw gatewayProblem(404, "DOCUMENT_NOT_FOUND", `Document ${id} was not found.`); return value; };
  const detail = (id: string): WorkingCopyDetail => {
    const base = { document: document(id), currentValidation: state.validations.get(id) ?? null, latestPreview: state.previews.get(id) ?? null, currentPublication: state.publications.get(id) ?? null, dependencyRevision: dependencies.dependencyRevision.current() };
    const nextAction = deriveDocumentState({ document: base.document, validation: base.currentValidation, preview: base.latestPreview, publication: base.currentPublication, dependencyRevision: base.dependencyRevision, now: dependencies.clock.now() }).nextAction;
    return { ...base, nextAction };
  };
  const version = (value: WorkingCopy, expected: number) => { if (value.version !== expected) throw gatewayProblem(409, "VERSION_CONFLICT", `Expected ${expected}; current ${value.version}.`, { latestDocument: clone(detail(value.id)), conflictingFields: [] }); };
  const structure = (input: WorkingCopyInput) => { const errors = validateWorkingCopyInputStructure(input); if (errors.length) throw requestError(errors); };
  const materialize = (id: string, value: number, input: WorkingCopyInput): WorkingCopy => ({ ...clone(input), id, version: value, updatedAt: dependencies.clock.now().toISOString(), relations: input.relations.map((relation) => ({ ...relation, id: relation.id ?? dependencies.idGenerator.next(), targetId: relation.targetId! })) }) as WorkingCopy;
  const summary = (value: WorkingCopy): components["schemas"]["DocumentSummary"] => {
    const publication = state.publications.get(value.id) ?? null; const project = value.projectId ? state.catalog.find((entry) => entry.id === value.projectId && entry.type === "PROJECT") : undefined;
    return { id: value.id, title: value.title, kind: value.kind, project: project ? { id: project.id, label: project.label, publicPath: project.publicPath ?? null } : null, updatedAt: value.updatedAt, publicationStatus: publication?.status ?? "NEVER_PUBLISHED", publishedVersion: publication?.publishedVersion ?? null, hasUnpublishedChanges: !publication || publication.publishedVersion !== value.version, nextAction: deriveDocumentState({ ...detail(value.id), now: dependencies.clock.now() }).nextAction };
  };
  const publicationRow = (event: PublicationEvent): PublicationListItem => {
    const publication = [...state.publications.values()].find((item) => item.publicationId === event.publicationId);
    if (!publication) throw gatewayProblem(404, "PUBLICATION_NOT_FOUND", "Publication not found.");
    const availableActions: components["schemas"]["PublicationAction"][] = event.type === "UNPUBLISHED" ? ["VIEW_SOURCE_SNAPSHOT"] : publication.status === "PUBLISHED" && publication.latestEventId === event.publicationEventId ? ["VIEW_SNAPSHOT", "UNPUBLISH"] : ["VIEW_SNAPSHOT"];
    return { event, publication, document: summary(document(event.documentId)), availableActions };
  };
  const queryText = (q?: unknown) => { if (q !== undefined && (typeof q !== "string" || cp(q) > 100)) throw requestError([{ path: "/q", message: "q must be at most 100 characters." }]); };

  return {
    getDashboard(options) { return read(options, () => { const all = [...state.documents.values()].map(summary); const readyAll = all.filter((item) => item.nextAction === "PUBLISH"); const needsValidationAll = all.filter((item) => item.nextAction === "VALIDATE" || item.nextAction === "FIX_VALIDATION"); const events = [...state.events.values()].sort((a, b) => b.occurredAt.localeCompare(a.occurredAt) || a.publicationEventId.localeCompare(b.publicationEventId)); return { continueWriting: all.filter((item) => !["NONE", "PUBLISH"].includes(item.nextAction)).slice(0, 5), readyToPublish: readyAll.slice(0, 5), recentPublications: events.slice(0, 5).map(publicationRow), totals: { documents: all.length, needsValidation: needsValidationAll.length, readyToPublish: readyAll.length, publications: events.length } } satisfies StudioDashboard; }); },
    listDocuments(query, options) { return read(options, () => {
      queryText(query.q); if (query.projectId !== undefined) uuid(query.projectId, "/projectId"); const limit = limitOf(query.limit); const normalized = { q: normalizeQ(query.q), kind: query.kind ?? null, publicationStatus: query.publicationStatus ?? null, nextAction: query.nextAction ?? null, projectId: query.projectId ?? null, sort: query.sort ?? "UPDATED_DESC" }; const binding = cursorBinding(normalized); const cursor = query.cursor ? decodeCursor(query.cursor, binding) : null;
      const items = [...state.documents.values()].map(summary).filter((item) => { const source = state.documents.get(item.id)!; return (!normalized.q || `${item.title} ${source.summary} ${source.slug}`.toLocaleLowerCase("ko-KR").includes(normalized.q)) && (!normalized.kind || item.kind === normalized.kind) && (!normalized.publicationStatus || item.publicationStatus === normalized.publicationStatus) && (!normalized.nextAction || item.nextAction === normalized.nextAction) && (!normalized.projectId || source.projectId === normalized.projectId); });
      items.sort((a, b) => { const primary = normalized.sort === "TITLE_ASC" ? a.title.localeCompare(b.title, "ko") : normalized.sort === "UPDATED_ASC" ? a.updatedAt.localeCompare(b.updatedAt) : b.updatedAt.localeCompare(a.updatedAt); return primary || a.id.localeCompare(b.id); });
      const page = cursor ? items.filter((item) => { const value = normalized.sort === "TITLE_ASC" ? item.title : item.updatedAt; const order = value.localeCompare(cursor.lastValue, normalized.sort === "TITLE_ASC" ? "ko" : undefined); return normalized.sort === "UPDATED_DESC" ? order < 0 || (order === 0 && item.id > cursor.lastId) : order > 0 || (order === 0 && item.id > cursor.lastId); }) : items; const selected = page.slice(0, limit); const last = selected.at(-1); const lastValue = last ? normalized.sort === "TITLE_ASC" ? last.title : last.updatedAt : "";
      return { items: selected, nextCursor: selected.length < page.length && last ? encodeCursor({ binding, lastValue, lastId: last.id }) : null } satisfies DocumentPage;
    }); },
    createDocument(input, options) { return idempotent("create", "documents", () => input, options, () => { structure(input); const value = materialize(dependencies.idGenerator.next(), 1, input); state.documents.set(value.id, value); return value; }); },
    getDocument(documentId, options) { return read(options, () => { uuid(documentId, "/documentId"); return detail(documentId); }); },
    saveDocument(documentId, command, options) { return idempotent("save", documentId, () => command, options, () => {
      uuid(documentId, "/documentId"); structure(command.document); const current = document(documentId); version(current, command.expectedVersion);
      if (state.pendingConflicts.delete(documentId)) { const latest = materialize(documentId, current.version + 1, { ...inputOf(current), title: "서버에서 먼저 수정된 제목", summary: "서버 최신 요약" }); state.documents.set(documentId, latest); state.validations.delete(documentId); throw gatewayProblem(409, "VERSION_CONFLICT", "The server document changed.", { latestDocument: clone(detail(documentId)), conflictingFields: ["/title", "/summary"] }); }
      const saved = materialize(documentId, current.version + 1, command.document); state.documents.set(documentId, saved); state.validations.delete(documentId); return detail(documentId);
    }); },
    validateDocument(documentId, command, options) { return idempotent("validate", documentId, () => command, options, () => { uuid(documentId, "/documentId"); const value = document(documentId); version(value, command.expectedVersion); const report = validateWorkingCopy(value, { now: dependencies.clock.now(), validationId: dependencies.idGenerator.next(), dependencyRevision: dependencies.dependencyRevision.current(), catalog: state.catalog, documents: [...state.documents.values()], assets: [...dependencies.assets.values()] }); state.validations.set(documentId, report); return report; }); },
    createPreview(documentId, command, options) { return idempotent("preview", documentId, () => command, options, () => {
      uuid(documentId, "/documentId"); const value = document(documentId); version(value, command.expectedVersion); const validation = state.validations.get(documentId); const now = dependencies.clock.now();
      if (!validation || validation.validationId !== command.validationId || validation.validatedVersion !== value.version || validation.dependencyRevision !== dependencies.dependencyRevision.current() || now.getTime() >= Date.parse(validation.validUntil) || validation.status === "INVALID") throw gatewayProblem(409, "VALIDATION_STALE", "Current validation without errors is required.");
      const createdAt = now.toISOString(); const preview: PublicPreview = { previewId: dependencies.idGenerator.next(), documentId, previewVersion: value.version, validationId: validation.validationId, dependencyRevision: dependencies.dependencyRevision.current(), createdAt, expiresAt: new Date(now.getTime() + 30 * 60_000).toISOString(), renderModel: projectWorkingCopy(inputOf(value), state.catalog, { generatedAt: createdAt, dependencyRevision: dependencies.dependencyRevision.current() }, [...dependencies.assets.values()]) }; state.previews.set(documentId, preview); return preview;
    }); },
    getCurrentPreview(documentId, options) { return read(options, () => { uuid(documentId, "/documentId"); const value = document(documentId); const preview = state.previews.get(documentId); if (!preview) throw gatewayProblem(404, "PREVIEW_NOT_FOUND", "Preview not found."); const validation = state.validations.get(documentId) ?? null; const result = derivePreviewState({ document: value, validation, preview, publication: state.publications.get(documentId) ?? null, dependencyRevision: dependencies.dependencyRevision.current(), now: dependencies.clock.now() }); return { preview, state: result === "NONE" ? "STALE" : result, currentDocumentVersion: value.version, currentValidationId: validation?.validationId ?? null } satisfies PreviewDetail; }); },
    publishDocument(documentId, command, options) { return idempotent("publish", documentId, () => ({ ...command, acknowledgedWarningCodes: Array.isArray(command.acknowledgedWarningCodes) ? [...command.acknowledgedWarningCodes].sort() : command.acknowledgedWarningCodes }), options, () => {
      uuid(documentId, "/documentId"); const value = document(documentId); version(value, command.expectedVersion); const existing = state.publications.get(documentId);
      if (existing?.status === "PUBLISHED" && existing.publishedVersion === value.version) return { publication: existing, event: state.events.get(existing.latestEventId)! };
      const now = dependencies.clock.now(); const validation = state.validations.get(documentId); if (!validation || validation.validationId !== command.validationId || validation.validatedVersion !== value.version || validation.dependencyRevision !== dependencies.dependencyRevision.current() || now.getTime() >= Date.parse(validation.validUntil) || validation.status === "INVALID") throw gatewayProblem(409, "VALIDATION_STALE", "Current validation required.");
      const preview = state.previews.get(documentId); if (!preview || preview.previewId !== command.previewId || preview.previewVersion !== value.version || preview.validationId !== validation.validationId) throw gatewayProblem(409, "PREVIEW_STALE", "Current preview required."); if (now.getTime() >= Date.parse(preview.expiresAt)) throw gatewayProblem(409, "PREVIEW_EXPIRED", "Preview expired.");
      const warnings = validation.issues.filter((issue) => issue.severity === "WARNING").map((issue) => issue.code); if (!exactSet(warnings, command.acknowledgedWarningCodes)) throw requestError([{ path: "/acknowledgedWarningCodes", message: "Acknowledge all current warnings." }]);
      const eventId = dependencies.idGenerator.next(); const publicationId = existing?.publicationId ?? dependencies.idGenerator.next(); const event: PublicationEvent = { publicationEventId: eventId, publicationId, documentId, type: existing ? "REPUBLISHED" : "PUBLISHED", occurredAt: now.toISOString(), publishedVersion: value.version, sourcePublishedEventId: null, snapshotAvailable: true }; const publication: PublicationAggregate = { publicationId, documentId, status: "PUBLISHED", publishedVersion: value.version, publicationRevision: (existing?.publicationRevision ?? 0) + 1, latestEventId: eventId, publicPath: preview.renderModel.publicPath, updatedAt: now.toISOString() }; state.events.set(eventId, event); state.publications.set(documentId, publication); state.snapshots.set(eventId, { event: clone(event), renderModel: clone(preview.renderModel), contentFormatVersion: CONTENT_FORMAT_VERSION, rendererContractVersion: RENDERER_CONTRACT_VERSION }); return { publication, event } satisfies PublishResult;
    }); },
    unpublishPublication(publicationId, command, options) { return idempotent("unpublish", publicationId, () => command, options, () => { uuid(publicationId, "/publicationId"); const current = [...state.publications.values()].find((item) => item.publicationId === publicationId); if (!current) throw gatewayProblem(404, "PUBLICATION_NOT_FOUND", "Publication not found."); if (current.publicationRevision !== command.expectedPublicationRevision) throw gatewayProblem(409, "PUBLICATION_CONFLICT", "Publication revision changed.", { latestPublication: clone(current) }); if (current.status === "UNPUBLISHED") return { publication: current, event: state.events.get(current.latestEventId)! }; const event: PublicationEvent = { publicationEventId: dependencies.idGenerator.next(), publicationId, documentId: current.documentId, type: "UNPUBLISHED", occurredAt: dependencies.clock.now().toISOString(), publishedVersion: current.publishedVersion, sourcePublishedEventId: current.latestEventId, snapshotAvailable: false }; const publication: PublicationAggregate = { ...current, status: "UNPUBLISHED", publicationRevision: current.publicationRevision + 1, latestEventId: event.publicationEventId, updatedAt: event.occurredAt }; state.events.set(event.publicationEventId, event); state.publications.set(current.documentId, publication); return { publication, event }; }); },
    listPublications(query, options) { return read(options, () => { queryText(query.q); const limit = limitOf(query.limit); const normalized = { q: normalizeQ(query.q), type: query.type ?? null, sort: "OCCURRED_DESC" }; const binding = cursorBinding(normalized); const cursor = query.cursor ? decodeCursor(query.cursor, binding) : null; const all = [...state.events.values()].filter((event) => (!normalized.type || event.type === normalized.type) && (!normalized.q || `${document(event.documentId).title} ${document(event.documentId).summary}`.toLocaleLowerCase("ko-KR").includes(normalized.q))).sort((a, b) => b.occurredAt.localeCompare(a.occurredAt) || a.publicationEventId.localeCompare(b.publicationEventId)); const source = cursor ? all.filter((event) => event.occurredAt < cursor.lastValue || (event.occurredAt === cursor.lastValue && event.publicationEventId > cursor.lastId)) : all; const selected = source.slice(0, limit); const last = selected.at(-1); return { items: selected.map(publicationRow), nextCursor: selected.length < source.length && last ? encodeCursor({ binding, lastValue: last.occurredAt, lastId: last.publicationEventId }) : null } satisfies PublicationPage; }); },
    getPublicationSnapshot(publicationEventId, options) { return read(options, () => { uuid(publicationEventId, "/publicationEventId"); if (!state.events.has(publicationEventId)) throw gatewayProblem(404, "PUBLICATION_EVENT_NOT_FOUND", "Publication event not found."); const snapshot = state.snapshots.get(publicationEventId); if (!snapshot) throw gatewayProblem(404, "PUBLICATION_SNAPSHOT_NOT_FOUND", "Publication snapshot not found."); return snapshot; }); },
    getCatalog(query, options) { return read(options, () => { if (!query.type) throw requestError([{ path: "/type", message: "type is required." }]); queryText(query.q); const limit = limitOf(query.limit); const normalized = { type: query.type, q: normalizeQ(query.q), sort: "LABEL_ASC" }; const binding = cursorBinding(normalized); const cursor = query.cursor ? decodeCursor(query.cursor, binding) : null; const all = state.catalog.filter((item) => item.type === query.type && (!normalized.q || item.label.toLocaleLowerCase("ko-KR").includes(normalized.q))).sort((a, b) => a.label.localeCompare(b.label, "ko") || a.id.localeCompare(b.id)); const source = cursor ? all.filter((item) => item.label.localeCompare(cursor.lastValue, "ko") > 0 || (item.label === cursor.lastValue && item.id > cursor.lastId)) : all; const selected = source.slice(0, limit); const last = selected.at(-1); return { items: selected, nextCursor: selected.length < source.length && last ? encodeCursor({ binding, lastValue: last.label, lastId: last.id }) : null } satisfies CatalogPage; }); },
  };
}