import { apiFetch } from "@/core/api";
import { getBackendBaseURL } from "@/core/config";

import type {
  BatchIngestPayload,
  BatchIngestResult,
  GraphExportResult,
  IngestThreadPayload,
  KnowledgeListParams,
  KnowledgeListResponse,
  KnowledgeNote,
  KnowledgeSearchItem,
  VaultPage,
  WikilinkResolutionMap,
} from "./types";

const baseUrl = () => `${getBackendBaseURL()}/api/knowledge`;

async function parseResponse<T>(response: Response): Promise<T> {
  if (!response.ok) {
    const error = await response
      .json()
      .catch(() => ({ detail: "Request failed" }));
    const detail = error.detail;
    if (typeof detail === "string") throw new Error(detail);
    throw new Error("请求失败");
  }
  return response.json() as Promise<T>;
}

export async function listKnowledgeNotes(params: KnowledgeListParams = {}) {
  const qs = new URLSearchParams();
  if (params.keyword) qs.set("keyword", params.keyword);
  if (params.tag) qs.set("tag", params.tag);
  if (params.entity) qs.set("entity", params.entity);
  if (params.source_type) qs.set("source_type", params.source_type);
  if (params.status) qs.set("status", params.status);
  qs.set("limit", String(params.limit ?? 20));
  qs.set("offset", String(params.offset ?? 0));
  return parseResponse<KnowledgeListResponse>(
    await apiFetch(`${baseUrl()}/notes?${qs.toString()}`),
  );
}

export async function getKnowledgeNote(noteId: string) {
  return parseResponse<KnowledgeNote>(
    await apiFetch(`${baseUrl()}/notes/${encodeURIComponent(noteId)}`),
  );
}

export async function createKnowledgeNote(data: {
  title: string;
  content_md: string;
  summary?: string | null;
  tags?: string[];
  status?: string;
}) {
  const res = await parseResponse<{ note: KnowledgeNote }>(
    await apiFetch(`${baseUrl()}/notes`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
  return res.note;
}

export async function updateKnowledgeNote(
  noteId: string,
  data: Partial<{
    title: string;
    content_md: string;
    summary: string | null;
    tags: string[];
    status: string;
  }>,
) {
  return parseResponse<KnowledgeNote>(
    await apiFetch(`${baseUrl()}/notes/${encodeURIComponent(noteId)}`, {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }),
  );
}

export async function deleteKnowledgeNote(noteId: string, hard = false) {
  return parseResponse<{ ok: boolean; note_id: string }>(
    await apiFetch(
      `${baseUrl()}/notes/${encodeURIComponent(noteId)}${hard ? "?hard=true" : ""}`,
      { method: "DELETE" },
    ),
  );
}

export async function searchKnowledge(query: string, limit = 8) {
  const res = await parseResponse<{ items: KnowledgeSearchItem[] }>(
    await apiFetch(`${baseUrl()}/search`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ query, mode: "keyword", limit }),
    }),
  );
  return res.items;
}

export async function ingestThread(threadId: string, payload: IngestThreadPayload = {}) {
  return parseResponse<{
    note?: KnowledgeNote;
    created?: boolean;
    queued?: boolean;
  }>(
    await apiFetch(`${baseUrl()}/ingest/thread/${encodeURIComponent(threadId)}`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    }),
  );
}

export async function ingestThreadsBatch(payload: BatchIngestPayload = {}) {
  return parseResponse<BatchIngestResult>(
    await apiFetch(`${baseUrl()}/ingest/threads/batch`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    }),
  );
}

export interface IngestFileResult {
  note: KnowledgeNote;
  created: boolean;
  notes: KnowledgeNote[];
  llm_fallback: boolean;
}

/** Import a file (md/txt/pdf/word/ppt/excel) into the KB as wiki note(s). */
export async function ingestKnowledgeFile(
  file: File,
  opts: { title?: string; tags?: string; status?: string; model_name?: string | null } = {},
) {
  const form = new FormData();
  form.append("file", file);
  if (opts.title) form.append("title", opts.title);
  if (opts.tags) form.append("tags", opts.tags);
  if (opts.status) form.append("status", opts.status);
  if (opts.model_name) form.append("model_name", opts.model_name);
  // No Content-Type header — the browser sets the multipart boundary itself.
  return parseResponse<IngestFileResult>(
    await apiFetch(`${baseUrl()}/ingest/file`, { method: "POST", body: form }),
  );
}

/** Resolve `[[wikilink]]` targets to note ids / vault pages. */
export async function resolveWikilinks(targets: string[]) {
  const res = await parseResponse<{ resolved: WikilinkResolutionMap }>(
    await apiFetch(`${baseUrl()}/resolve`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ targets }),
    }),
  );
  return res.resolved;
}

/** Resolve every `[[wikilink]]` inside a note's body in one call. */
export async function resolveNoteWikilinks(noteId: string) {
  const res = await parseResponse<{ resolved: WikilinkResolutionMap }>(
    await apiFetch(
      `${baseUrl()}/notes/${encodeURIComponent(noteId)}/wikilinks`,
    ),
  );
  return res.resolved;
}

/** Fetch a raw vault meta/hub Markdown page (no DB note) by its path. */
export async function fetchVaultPage(path: string) {
  return parseResponse<VaultPage>(
    await apiFetch(`${baseUrl()}/vault-page?path=${encodeURIComponent(path)}`),
  );
}

export async function exportKnowledgeGraph() {
  return parseResponse<GraphExportResult>(
    await apiFetch(`${baseUrl()}/export/graph`, { method: "POST" }),
  );
}

/** Absolute URL of a served wiki-export file (for iframe / download). */
export function knowledgeExportFileUrl(filename: string) {
  return `${baseUrl()}/export/files/${encodeURIComponent(filename)}`;
}

// --- phase 2/3/4 ---

export interface KnowledgeVersion {
  id: string;
  note_id: string;
  title: string;
  summary?: string | null;
  content_md: string;
  status: string;
  tags: string[];
  edited_by?: string | null;
  created_at?: string | null;
}

export async function listNoteVersions(noteId: string) {
  const res = await parseResponse<{ items: KnowledgeVersion[] }>(
    await apiFetch(`${baseUrl()}/notes/${encodeURIComponent(noteId)}/versions`),
  );
  return res.items;
}

export interface DuplicateGroup {
  primary: { id: string; title: string | null };
  duplicates: Array<{ id: string; title: string | null; score: number }>;
}

export async function listDuplicates() {
  const res = await parseResponse<{ groups: DuplicateGroup[] }>(
    await apiFetch(`${baseUrl()}/duplicates`),
  );
  return res.groups;
}

export async function mergeKnowledgeNotes(primaryId: string, duplicateIds: string[]) {
  return parseResponse<{ note: KnowledgeNote }>(
    await apiFetch(`${baseUrl()}/merge`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ primary_id: primaryId, duplicate_ids: duplicateIds }),
    }),
  );
}

export async function reindexKnowledge() {
  return parseResponse<{ reindexed: number; embedding_enabled: number }>(
    await apiFetch(`${baseUrl()}/reindex`, { method: "POST" }),
  );
}

export interface KnowledgeGraph {
  nodes: Array<{ id: string; type: string; label: string; category?: string | null }>;
  edges: Array<{ id: string; source: string; target: string; label: string; weight: number }>;
}

export async function getKnowledgeGraph() {
  return parseResponse<KnowledgeGraph>(await apiFetch(`${baseUrl()}/graph`));
}

// --- graph blacklist ---

export interface GraphBlacklistItem {
  id: string;
  label: string;
  created_by?: string | null;
  created_at?: string | null;
}

export async function getGraphBlacklist() {
  const res = await parseResponse<{ items: GraphBlacklistItem[] }>(
    await apiFetch(`${baseUrl()}/graph/blacklist`),
  );
  return res.items;
}

/** Blacklist node labels (entity names / note titles); they disappear from the graph. */
export async function addGraphBlacklist(labels: string[]) {
  return parseResponse<{ added: number; items: GraphBlacklistItem[] }>(
    await apiFetch(`${baseUrl()}/graph/blacklist`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ labels }),
    }),
  );
}

export async function removeGraphBlacklist(entryId: string) {
  return parseResponse<{ ok: boolean }>(
    await apiFetch(`${baseUrl()}/graph/blacklist/${encodeURIComponent(entryId)}`, {
      method: "DELETE",
    }),
  );
}