import type { SavedConnection, QueryResult, TreeNode, ColumnInfo } from "./store";
import { decodeSecret } from "./secrets";

/** C2:桌面 sidecar 注入的运行时配置(缺省时行为与现状一致) */
declare global {
  interface Window {
    __OPSXDB_API__?: string;
    __OPSXDB_TOKEN__?: string;
    __OPSXDB_BOOT_ERROR__?: string;
  }
}

function injectedApi(): string | undefined {
  if (typeof window === "undefined") return undefined;
  const v = window.__OPSXDB_API__;
  return v ? v.replace(/\/$/, "") : undefined;
}

function injectedToken(): string {
  if (typeof window === "undefined") return "";
  return window.__OPSXDB_TOKEN__ ?? "";
}

/** 开发态走 Vite 代理（空串）；桌面生产包优先 sidecar 注入地址，回落默认 8788。 */
function resolveApiBase(): string {
  const injected = injectedApi();
  if (injected) return injected;
  const fromEnv = (import.meta as { env?: Record<string, string> }).env?.VITE_OPSXDB_API;
  if (fromEnv) return fromEnv.replace(/\/$/, "");
  if (typeof window === "undefined") return "";
  const { protocol, hostname, port } = window.location;
  if (protocol === "tauri:" || hostname === "tauri.localhost" || hostname === "localhost" && port === "") {
    return "http://127.0.0.1:8788";
  }
  return "";
}

const API = resolveApiBase();

/** C2:token 存在时统一带 Authorization 头；token 为空（本机 dev）行为不变 */
function authHeaders(): Record<string, string> {
  const token = injectedToken();
  return token ? { Authorization: `Bearer ${token}` } : {};
}

async function post<T>(path: string, body: unknown, signal?: AbortSignal): Promise<T> {
  const res = await fetch(`${API}${path}`, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...authHeaders() },
    body: JSON.stringify(body),
    signal,
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error((data as { error?: string }).error || res.statusText || "request failed");
  }
  return data as T;
}

async function get<T>(path: string, signal?: AbortSignal): Promise<T> {
  const res = await fetch(`${API}${path}`, { headers: { ...authHeaders() }, signal });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error((data as { error?: string }).error || res.statusText || "request failed");
  }
  return data as T;
}

export type ConnBody = {
  driver?: string;
  host?: string;
  port?: number;
  user?: string;
  password?: string;
  database?: string;
  service?: string;
  ssl?: boolean;
  sslMode?: string;
  sslCA?: string;
  sslCert?: string;
  sslKey?: string;
  sessionId?: string;
  sql?: string;
  table?: string;
  limit?: number;
  /** E1:执行请求标识,配合 POST /api/db/cancel 取消在途语句 */
  requestId?: string;
  /** E2:单语句执行超时(毫秒),0/缺省 = 服务端默认不额外限制 */
  timeoutMs?: number;
  /** E6:对象搜索关键字 */
  keyword?: string;
  /** E7:服务端导出格式 */
  format?: string;
  /** C5:结果分页,跳过前 offset 行 */
  offset?: number;
  /** C1:前端已完成危险语句确认后重发时置 true */
  confirmDanger?: boolean;
  key?: string;
  pattern?: string;
  keyCursor?: string;
  cursor?: number;
  redisMode?: string;
  redisNodes?: string;
  masterName?: string;
  sentinelPassword?: string;
  sshEnabled?: boolean;
  sshHost?: string;
  sshPort?: number;
  sshUser?: string;
  sshAuth?: string;
  sshPassword?: string;
  sshPrivateKey?: string;
  sshPassphrase?: string;
};

export function fullConnPayload(c: SavedConnection): ConnBody {
  const sslOn = !!(c.ssl || (c.sslMode && c.sslMode !== "disable"));
  return {
    driver: c.driver,
    host: c.host,
    port: c.port,
    user: c.user,
    password: decodeSecret(c.password),
    database: c.database,
    service: c.service,
    ssl: sslOn,
    sslMode: sslOn ? (c.sslMode && c.sslMode !== "disable" ? c.sslMode : "require") : "disable",
    sslCA: c.sslCA || "",
    sslCert: c.sslCert || "",
    sslKey: c.sslKey || "",
    redisMode: c.redisMode || "standalone",
    redisNodes: c.redisNodes || "",
    masterName: c.masterName || "",
    sentinelPassword: c.sentinelPassword ? decodeSecret(c.sentinelPassword) : "",
    sshEnabled: !!c.sshEnabled,
    sshHost: c.sshHost,
    sshPort: c.sshPort,
    sshUser: c.sshUser,
    sshAuth: c.sshAuth,
    sshPassword: c.sshPassword ? decodeSecret(c.sshPassword) : "",
    sshPrivateKey: c.sshPrivateKey,
    sshPassphrase: c.sshPassphrase ? decodeSecret(c.sshPassphrase) : "",
  };
}

export function sessionPayload(c: SavedConnection, sessionId: string, extra?: Partial<ConnBody>): ConnBody {
  return {
    sessionId,
    database: extra?.database ?? c.database,
    sql: extra?.sql,
    table: extra?.table,
    limit: extra?.limit,
    offset: extra?.offset,
    confirmDanger: extra?.confirmDanger,
    key: extra?.key,
    pattern: extra?.pattern,
    keyCursor: extra?.keyCursor,
    service: extra?.service ?? c.service,
    requestId: extra?.requestId,
    timeoutMs: extra?.timeoutMs,
    keyword: extra?.keyword,
    format: extra?.format,
  };
}

export async function testConnection(c: SavedConnection) {
  return post<{ ok: boolean; message?: string }>("/api/db/test-connection", fullConnPayload(c));
}

export async function openSession(c: SavedConnection) {
  return post<{ ok: boolean; sessionId: string; message?: string }>("/api/db/open", fullConnPayload(c));
}

export async function closeSession(sessionId: string) {
  return post<{ ok: boolean }>("/api/db/close", { sessionId });
}

function body(c: SavedConnection, sessionId: string | undefined, extra?: Partial<ConnBody>): ConnBody {
  if (sessionId) return sessionPayload(c, sessionId, extra);
  return { ...fullConnPayload(c), ...extra };
}

export async function listDatabases(c: SavedConnection, sessionId?: string) {
  return post<{ databases: string[] }>("/api/db/databases", body(c, sessionId));
}

/**
 * C8:schema 缓存 —— connId → database → table → columns。
 * listTables/listColumns 成功时写入,供 SqlEditor 补全与 AiPanel 上下文注入共用。
 */
const schemaCache = new Map<string, Map<string, Map<string, ColumnInfo[]>>>();

function cacheTables(connId: string, db: string, tables: string[]) {
  let dbMap = schemaCache.get(connId);
  if (!dbMap) {
    dbMap = new Map();
    schemaCache.set(connId, dbMap);
  }
  let tblMap = dbMap.get(db);
  if (!tblMap) {
    tblMap = new Map();
    dbMap.set(db, tblMap);
  }
  for (const t of tables) {
    if (!tblMap.has(t)) tblMap.set(t, []);
  }
}

function cacheColumns(connId: string, db: string, table: string, columns: ColumnInfo[]) {
  let dbMap = schemaCache.get(connId);
  if (!dbMap) {
    dbMap = new Map();
    schemaCache.set(connId, dbMap);
  }
  let tblMap = dbMap.get(db);
  if (!tblMap) {
    tblMap = new Map();
    dbMap.set(db, tblMap);
  }
  tblMap.set(table, columns);
}

/** 连接关闭/删除后丢弃其缓存,避免跨连接串数据 */
export function dropSchemaCache(connId: string) {
  schemaCache.delete(connId);
}

/** SqlEditor 补全数据源:已加载的表与列 */
export function getCachedSchema(
  connId: string | null | undefined,
): Map<string, Map<string, ColumnInfo[]>> | null {
  if (!connId) return null;
  return schemaCache.get(connId) ?? null;
}

/**
 * AiPanel 上下文注入:把已加载的库表列拼成文本,按 connId 隔离,截断 4000 字符。
 * 优先输出当前库,其余库只列库.表名。
 */
export function schemaContextFor(connId: string | null | undefined, currentDb?: string): string {
  const dbMap = connId ? schemaCache.get(connId) : undefined;
  if (!dbMap || dbMap.size === 0) return "";
  const MAX = 4000;
  const lines: string[] = [];
  const dbs = [...dbMap.keys()].sort((a, b) => {
    if (a === currentDb) return -1;
    if (b === currentDb) return 1;
    return a.localeCompare(b);
  });
  for (const db of dbs) {
    const tblMap = dbMap.get(db)!;
    for (const [table, cols] of tblMap) {
      const colText = cols.length
        ? `(${cols.map((c) => `${c.name} ${c.type}`.trim()).join(", ")})`
        : "";
      lines.push(`${db}.${table}${colText}`);
      if (lines.join("\n").length > MAX) {
        return lines.join("\n").slice(0, MAX);
      }
    }
  }
  return lines.join("\n").slice(0, MAX);
}

export async function listTables(c: SavedConnection, database: string, sessionId?: string) {
  const res = await post<{ tables: string[] }>("/api/db/tables", body(c, sessionId, { database }));
  if (Array.isArray(res.tables)) cacheTables(c.id, database, res.tables);
  return res;
}

export async function listColumns(c: SavedConnection, database: string, table: string, sessionId?: string) {
  const res = await post<{ columns: ColumnInfo[] }>("/api/db/columns", body(c, sessionId, { database, table }));
  if (Array.isArray(res.columns)) cacheColumns(c.id, database, table, res.columns);
  return res;
}

/** E1:最近一次 execSql 的 requestId,供 cancelExec() 取消在途语句 */
let lastExecRequestId: string | undefined;

export async function execSql(
  c: SavedConnection,
  sql: string,
  opts?: {
    database?: string;
    sessionId?: string;
    limit?: number;
    offset?: number;
    confirmDanger?: boolean;
    /** E2:单语句执行超时(毫秒),0/缺省 = 不额外限制 */
    timeoutMs?: number;
    signal?: AbortSignal;
  },
) {
  // E1:每次执行生成独立 requestId(模块级记录最后一次),取消端点按 id 精准取消
  const requestId = crypto.randomUUID();
  lastExecRequestId = requestId;
  return post<QueryResult>(
    "/api/db/exec",
    body(c, opts?.sessionId, {
      sql,
      database: opts?.database || c.database,
      limit: opts?.limit,
      offset: opts?.offset,
      confirmDanger: opts?.confirmDanger,
      requestId,
      timeoutMs: opts?.timeoutMs,
    }),
    opts?.signal,
  );
}

/**
 * E1:取消最近一次执行 —— fire-and-forget 调 POST /api/db/cancel。
 * 与前端 abort 互补:服务端收到取消后释放连接/杀查询,错误一律吞掉。
 */
export function cancelExec(): void {
  const rid = lastExecRequestId;
  if (!rid) return;
  void fetch(`${API}/api/db/cancel`, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...authHeaders() },
    body: JSON.stringify({ requestId: rid }),
  }).catch(() => {
    /* 取消失败不影响本地中止流程 */
  });
}

/** E5:查看表/视图 DDL(方言差异由服务端处理) */
export async function getDdl(
  c: SavedConnection,
  table: string,
  opts?: { database?: string; sessionId?: string },
) {
  return post<{ ddl?: string; error?: string }>(
    "/api/db/ddl",
    body(c, opts?.sessionId, { table, database: opts?.database || c.database }),
  );
}

export type SearchObjectHit = { schema: string; name: string; type: "table" | "view" };

/** E6:跨库对象搜索(服务端 LIKE,大小写策略由驱动决定) */
export async function searchObjects(
  c: SavedConnection,
  keyword: string,
  opts?: { database?: string; sessionId?: string },
) {
  return post<{ results: SearchObjectHit[]; error?: string }>(
    "/api/db/search",
    body(c, opts?.sessionId, { keyword, database: opts?.database || c.database }),
  );
}

export type ExportRequest = {
  format: "csv" | "json" | "insert";
  /** 自定义查询导出(单条 SELECT);命中危险/非 SELECT 时服务端返回 needConfirm */
  sql?: string;
  /** 整表导出 */
  table?: string;
  limit?: number;
  database?: string;
  sessionId?: string;
  /** C1:危险确认二段流重发时置 true */
  confirmDanger?: boolean;
};

/** E7 服务端导出失败:Error 上挂 needConfirm,由调用侧弹二段确认后重发 */
export type ExportError = Error & { needConfirm?: boolean };

/**
 * E7:服务端导出 —— 文件流下载(Content-Disposition attachment)。
 * 返回 blob 与解析出的文件名;失败时抛 ExportError(needConfirm=true 表示需二段确认)。
 */
export async function exportData(c: SavedConnection, opts: ExportRequest): Promise<{ blob: Blob; filename?: string }> {
  const res = await fetch(`${API}/api/db/export`, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...authHeaders() },
    body: JSON.stringify(
      body(c, opts.sessionId, {
        format: opts.format,
        sql: opts.sql,
        table: opts.table,
        limit: opts.limit,
        database: opts.database || c.database,
        confirmDanger: opts.confirmDanger,
      }),
    ),
  });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    const err = new Error((data as { error?: string }).error || res.statusText || "导出失败") as ExportError;
    if ((data as { needConfirm?: boolean }).needConfirm) err.needConfirm = true;
    throw err;
  }
  const cd = res.headers.get("Content-Disposition") || "";
  const m = /filename\*?=(?:UTF-8''|\")?([^";]+)/i.exec(cd);
  const filename = m ? decodeURIComponent(m[1].replace(/"$/, "").trim()) : undefined;
  const blob = await res.blob();
  return { blob, filename };
}

/** C3:服务端专用执行计划端点(方言包装在服务端完成,前端不再拼 EXPLAIN) */
export type ExplainResult = {
  columns?: string[];
  rows?: Record<string, unknown>[];
  /** MSSQL SHOWPLAN_XML / Oracle 文本计划 */
  text?: string;
  timeMs: number;
  error?: string;
};

export async function explainSql(
  c: SavedConnection,
  sql: string,
  opts?: { database?: string; sessionId?: string; signal?: AbortSignal },
) {
  return post<ExplainResult>(
    "/api/db/explain",
    body(c, opts?.sessionId, { sql, database: opts?.database || c.database }),
    opts?.signal,
  );
}


export type RedisKeyInfo = { name: string; type: string; ttl: number; exact?: boolean };

export type RedisKeysResult = {
  keys: RedisKeyInfo[];
  nextCursor?: string;
  exactHit?: boolean;
  truncated?: boolean;
  timeMs?: number;
  error?: string;
};

export type RedisKeyValue = {
  name: string;
  type: string;
  ttl: number;
  columns: string[];
  rows: Record<string, unknown>[];
  rowCount: number;
  timeMs: number;
  truncated?: boolean;
  limit?: number;
  /** >0 表示还有更多；续载时作为 cursor 回传 */
  nextCursor?: number;
  error?: string;
};

export async function listRedisKeys(
  c: SavedConnection,
  database: string,
  opts?: { sessionId?: string; pattern?: string; limit?: number; keyCursor?: string },
) {
  return post<RedisKeysResult>(
    "/api/db/redis/keys",
    body(c, opts?.sessionId, { database, pattern: opts?.pattern, limit: opts?.limit, keyCursor: opts?.keyCursor, driver: c.driver }),
  );
}

export async function getRedisKey(
  c: SavedConnection,
  database: string,
  key: string,
  opts?: { sessionId?: string; limit?: number; cursor?: number },
) {
  return post<RedisKeyValue>(
    "/api/db/redis/key",
    body(c, opts?.sessionId, { database, key, table: key, limit: opts?.limit, cursor: opts?.cursor, driver: c.driver }),
  );
}

export async function deleteRedisKey(
  c: SavedConnection,
  database: string,
  key: string,
  opts?: { sessionId?: string },
) {
  return post<QueryResult>(
    "/api/db/redis/key/delete",
    body(c, opts?.sessionId, { database, key, table: key, driver: c.driver }),
  );
}

/** 目录（前缀）批量删除：pattern 如 `agent:*`；后端 SCAN+UNLINK，拒全库与超上限 */
export async function deleteRedisPattern(
  c: SavedConnection,
  database: string,
  pattern: string,
  opts?: { sessionId?: string },
) {
  return post<{ deleted: number; scanned: number; truncated: boolean; error?: string; timeMs?: number }>(
    "/api/db/redis/del-pattern",
    body(c, opts?.sessionId, { database, pattern, driver: c.driver }),
  );
}


export async function loadTree(c: SavedConnection, sessionId?: string): Promise<TreeNode[]> {
  const { databases } = await listDatabases(c, sessionId);
  return databases.map((name) => ({ name, kind: "database" as const }));
}

export type AiAction =
  | "ask"
  | "generate"
  | "explain"
  | "optimize"
  | "fix"
  | "dialect"
  | "sample";

export async function callAi(
  payload: {
    action: AiAction;
    prompt?: string;
    sql?: string;
    driver?: string;
    database?: string;
    error?: string;
    /** C4/C8:前端注入的库表列上下文(截断 4000 字符) */
    schema?: string;
    model?: string;
  },
  signal?: AbortSignal,
) {
  return post<{ content: string; sql?: string }>("/api/ai/chat", payload, signal);
}

/** 阶段 2：Agent 模式 — 服务端多轮调同一 aitools Runtime（Ask 仍用 callAi） */
export type AiAgentStep = {
  tool: string;
  args?: string;
  ok: boolean;
  summary: string;
  error?: string;
  ms: number;
};

export type AiAgentRes = {
  content: string;
  sql?: string;
  steps: AiAgentStep[];
  rounds: number;
  runId?: string;
  sessionId?: string;
  runOutcome?: string;
  incompleteReason?: string;
  resumable?: boolean;
  stepsBudget?: number;
};

export async function callAiAgent(payload: AiAgentStreamPayload) {
  return post<AiAgentRes>("/api/ai/agent", payload);
}

export type AiSessionSummary = {
  id: string;
  title?: string;
  status: string;
  createdAt: string;
  updatedAt: string;
  msgCount: number;
  lastRunId?: string;
};

export async function listAiSessions() {
  return get<{ sessions: AiSessionSummary[] }>("/api/ai/sessions");
}

export async function getAiSession(id: string) {
  return get<{
    id: string;
    title?: string;
    status: string;
    messages: unknown[];
    runs?: unknown[];
  }>(`/api/ai/sessions/${encodeURIComponent(id)}`);
}

export async function continueAiSession(
  id: string,
  payload: {
    prompt?: string;
    connectionId?: string;
    driver?: string;
    database?: string;
    model?: string;
    maxRounds?: number;
    stream?: boolean;
  },
) {
  return post<AiAgentRes>(`/api/ai/sessions/${encodeURIComponent(id)}/continue`, payload);
}

export type AiAgentQueryResult = {
  columns: string[];
  rows: Record<string, unknown>[];
  rowCount: number;
  sql?: string;
  tool?: string;
};

export type AiAgentStepExt = AiAgentStep & {
  pending?: boolean;
  needConfirm?: boolean;
  confirmSql?: string;
  confirmBind?: string;
  result?: AiAgentQueryResult;
};

export type AiAgentStreamHandlers = {
  onStepStart?: (step: AiAgentStepExt) => void;
  onStep?: (step: AiAgentStepExt) => void;
  onDelta?: (delta: string) => void;
  onDone?: (res: AiAgentRes) => void;
  onIncomplete?: (res: AiAgentRes) => void;
  onSession?: (meta: { sessionId?: string; runId?: string; runOutcome?: string; resumable?: boolean }) => void;
  onError?: (error: string, partial?: Partial<AiAgentRes>) => void;
};

/** Agent SSE（stream=true）；不可用时回落非流式。signal 供「停止」。 */
export type AiAgentStreamPayload = {
  prompt: string;
  connectionId?: string;
  driver?: string;
  database?: string;
  model?: string;
  sessionId?: string;
  continue?: boolean;
  maxRounds?: number;
  prior?: unknown[];
};

export async function callAiAgentStream(
  payload: AiAgentStreamPayload,
  handlers: AiAgentStreamHandlers,
  signal?: AbortSignal,
): Promise<AiAgentRes> {
  try {
    const res = await fetch(`${API}/api/ai/agent`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Accept: "text/event-stream",
        ...authHeaders(),
      },
      body: JSON.stringify({ ...payload, stream: true }),
      signal,
    });
    if (!res.ok || !res.body || !(res.headers.get("content-type") || "").includes("text/event-stream")) {
      const plain = await callAiAgent(payload);
      handlers.onDone?.(plain);
      return plain;
    }
    const reader = res.body.getReader();
    const dec = new TextDecoder();
    let buf = "";
    let content = "";
    const steps: AiAgentStep[] = [];
    let rounds = 0;
    let finalRes: AiAgentRes | null = null;

    const handleEvent = (event: string, data: string) => {
      let ev: Record<string, unknown>;
      try {
        ev = JSON.parse(data) as Record<string, unknown>;
      } catch {
        return;
      }
      const typ = event || String(ev.type || "");
      if (typ === "step_start" && ev.step) {
        handlers.onStepStart?.(ev.step as AiAgentStepExt);
      } else if (typ === "step" && ev.step) {
        const st = ev.step as AiAgentStepExt;
        steps.push(st);
        handlers.onStep?.(st);
      } else if (typ === "delta") {
        const d = String(ev.delta || "");
        content += d;
        handlers.onDelta?.(d);
      } else if (typ === "done" || typ === "incomplete") {
        finalRes = {
          content: String(ev.content ?? content),
          sql: ev.sql ? String(ev.sql) : undefined,
          steps: (ev.steps as AiAgentStep[]) || steps,
          rounds: Number(ev.rounds ?? rounds) || 0,
          runId: ev.runId ? String(ev.runId) : undefined,
          sessionId: ev.sessionId ? String(ev.sessionId) : undefined,
          runOutcome: ev.runOutcome ? String(ev.runOutcome) : typ === "incomplete" ? "incomplete" : undefined,
          incompleteReason: ev.incompleteReason ? String(ev.incompleteReason) : undefined,
          resumable: !!ev.resumable,
          stepsBudget: ev.stepsBudget != null ? Number(ev.stepsBudget) : undefined,
        };
        rounds = finalRes.rounds;
        if (typ === "incomplete") handlers.onIncomplete?.(finalRes);
        else handlers.onDone?.(finalRes);
      } else if (typ === "session") {
        handlers.onSession?.({
          sessionId: ev.content ? String(ev.content) : ev.sessionId ? String(ev.sessionId) : undefined,
          runId: ev.runId ? String(ev.runId) : undefined,
          runOutcome: ev.runOutcome ? String(ev.runOutcome) : undefined,
          resumable: !!ev.resumable,
        });
        if (finalRes) {
          finalRes = {
            ...finalRes,
            sessionId: (ev.content ? String(ev.content) : finalRes.sessionId) || finalRes.sessionId,
            runId: ev.runId ? String(ev.runId) : finalRes.runId,
            runOutcome: ev.runOutcome ? String(ev.runOutcome) : finalRes.runOutcome,
            resumable: ev.resumable != null ? !!ev.resumable : finalRes.resumable,
          };
        }
      } else if (typ === "error") {
        handlers.onError?.(String(ev.error || "agent error"), { content, steps, rounds: Number(ev.rounds) || 0 });
      }
    };

    while (true) {
      const { done, value } = await reader.read();
      if (done) break;
      buf += dec.decode(value, { stream: true });
      let idx: number;
      while ((idx = buf.indexOf("\n\n")) >= 0) {
        const chunk = buf.slice(0, idx);
        buf = buf.slice(idx + 2);
        let event = "";
        let data = "";
        for (const line of chunk.split("\n")) {
          if (line.startsWith("event:")) event = line.slice(6).trim();
          else if (line.startsWith("data:")) data += (data ? "\n" : "") + line.slice(5).trim();
        }
        if (data) handleEvent(event, data);
      }
    }
    if (finalRes) return finalRes;
    const fallback: AiAgentRes = { content, steps, rounds };
    handlers.onDone?.(fallback);
    return fallback;
  } catch (e) {
    if (signal?.aborted) throw e;
    const plain = await callAiAgent(payload);
    handlers.onDone?.(plain);
    return plain;
  }
}

export type McpStatus = {
  configured: boolean;
  mode: string;
  whitelistCount: number;
  writesEnabled: boolean;
  allowDangerous?: boolean;
  active: boolean;
  recent?: { time: string; tool: string; ok: boolean; summary?: string; error?: string; source?: string }[];
  policyPath?: string;
};

export type McpPolicy = {
  allowed_connection_ids: string[];
  mode: "read_only" | "read_write" | string;
  allow_dangerous?: boolean;
  default_limit?: number;
  max_limit?: number;
};

export type McpInstallInfo = {
  status: "ready" | "partial" | "not_installed" | string;
  installed: boolean;
  currentVersion?: string;
  latestVersion?: string;
  nodeVersion?: string;
  npmAvailable: boolean;
  npmVersion?: string;
  npmPackageInstalled: boolean;
  npmPackageVersion?: string;
  goBinaryFound: boolean;
  goBinaryPath?: string;
  installCommand: string;
  npxCommand?: string;
  policyPath?: string;
  hint?: string;
};

export async function getMcpStatus(signal?: AbortSignal) {
  return get<McpStatus>("/api/ai/mcp-status", signal);
}

export async function getMcpPolicy(signal?: AbortSignal) {
  return get<{ policy: McpPolicy; path?: string }>("/api/ai/mcp-policy", signal);
}

export async function saveMcpPolicy(policy: McpPolicy, signal?: AbortSignal) {
  const res = await fetch(`${API}/api/ai/mcp-policy`, {
    method: "PUT",
    headers: { "Content-Type": "application/json", ...authHeaders() },
    body: JSON.stringify(policy),
    signal,
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error((data as { error?: string }).error || res.statusText || "request failed");
  }
  return data as { ok: boolean; policy: McpPolicy; path?: string };
}

export async function getMcpInstall(signal?: AbortSignal) {
  return get<McpInstallInfo>("/api/ai/mcp-install", signal);
}

export async function confirmAiAgentWrite(payload: {
  connectionId: string;
  sql?: string;
  command?: string;
  database?: string;
  kind?: "query" | "redis";
  confirmBind?: string;
  runId?: string;
}) {
  return post<Record<string, unknown>>("/api/ai/agent/confirm", payload);
}

/** C4:AI 配置(key 脱敏,只回掩码与是否已配置);protocol/authStyle/allowInsecureHttp 见 aiPresets.ts */
export type AiConfig = {
  provider: string;
  baseURL: string;
  model: string;
  hasKey: boolean;
  apiKey?: string;
  protocol?: string;
  authStyle?: string;
  allowInsecureHttp?: boolean;
};

export async function getAiConfig(signal?: AbortSignal) {
  return get<AiConfig>("/api/ai/config", signal);
}


let connectionSyncQueue: Promise<void> = Promise.resolve();

/** 按顺序同步桌面连接；Agent 必须等待成功，避免旧快照覆盖最新连接。 */
export function syncConnectionsToDisk(connections: SavedConnection[]): Promise<void> {
  const body = JSON.stringify({ connections });
  const sync = connectionSyncQueue.catch(() => {}).then(async () => {
    const controller = new AbortController();
    const timer = setTimeout(() => controller.abort(), 10000);
    try {
      const res = await fetch(`${API}/api/db/connections-store`, {
        method: "PUT",
        headers: { "Content-Type": "application/json", ...authHeaders() },
        body,
        signal: controller.signal,
      });
      if (!res.ok) throw new Error(`本机服务返回 ${res.status}`);
      const result = await res.json();
      if (result?.ok !== true) throw new Error("本机服务未确认连接已保存");
    } catch (e) {
      throw new Error(`连接同步失败，Agent 尚未执行任务：${controller.signal.aborted ? "本机服务响应超时" : e instanceof Error ? e.message : String(e)}`);
    } finally {
      clearTimeout(timer);
    }
  });
  connectionSyncQueue = sync;
  return sync;
}

export async function loadConnectionsFromDisk(): Promise<SavedConnection[] | null> {
  try {
    const res = await fetch(`${API}/api/db/connections-store`, { headers: { ...authHeaders() } });
    if (!res.ok) return null;
    const data = (await res.json()) as { connections?: SavedConnection[] };
    return Array.isArray(data.connections) ? data.connections : null;
  } catch {
    return null;
  }
}

export async function saveAiConfig(cfg: {
  provider: string;
  baseURL: string;
  apiKey?: string;
  model: string;
  protocol?: string;
  authStyle?: string;
  allowInsecureHttp?: boolean;
}) {
  return post<{ ok: boolean }>("/api/ai/config", cfg);
}

export async function health() {
  const res = await fetch(`${API}/api/health`, { headers: { ...authHeaders() } });
  if (!res.ok) throw new Error(`health ${res.status}`);
  const data = await res.json() as { service?: string; version?: string };
  if (data.service !== "opsxdb") throw new Error("当前地址不是 OpsxDB 后端");
  return data;
}

/** fetch AbortController / DOMException AbortError */
export function isAbortError(e: unknown): boolean {
  if (!e || typeof e !== "object") return false;
  const name = (e as { name?: string }).name;
  if (name === "AbortError") return true;
  const msg = e instanceof Error ? e.message : String(e);
  return /aborted|abort/i.test(msg) && !/session/i.test(msg);
}

// ---------- 驱动管理（agent 驱动） ----------

export type DriverJarStatus = { file: string; size: number; installed: boolean };

export type DriverStatusItem = {
  id: string;
  label: string;
  runtime: string;
  license: string;
  autoFetch: boolean;
  jars: DriverJarStatus[];
  allInstalled: boolean;
  jdkRequired: boolean;
  jdkOk: boolean;
  javaVersion: string;
  agentInstalled: boolean;
  offlinePack: boolean;
};

export async function driverStatus() {
  const res = await fetch(`${API}/api/drivers/status`);
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error((data as { error?: string }).error || res.statusText);
  const drivers = (data as { drivers?: DriverStatusItem[] }).drivers;
  if (!Array.isArray(drivers)) throw new Error("本机服务未提供驱动状态，请重启桌面应用后重试");
  return drivers;
}

export async function driverInstall(driver: string) {
  return post<{ ok: boolean; error?: string; drivers?: DriverStatusItem[] }>("/api/drivers/install", { driver });
}

export async function driverImportOffline(file: File) {
  const form = new FormData();
  form.append("file", file);
  const res = await fetch(`${API}/api/drivers/import`, { method: "POST", body: form });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error((data as { error?: string }).error || res.statusText);
  return data as { ok: boolean; error?: string; imported?: number; drivers?: DriverStatusItem[] };
}

/** 表转储范围:仅结构 / 仅数据 / 结构+数据(服务端 DumpTable 对应值) */
export type DumpMode = "structure" | "data" | "structure_data";

/** 表右键「转储 SQL 文件」:POST /api/db/download → blob 下载(.sql) */
export async function dumpTable(
  c: SavedConnection,
  opts: { table: string; database?: string; mode: DumpMode; sessionId?: string },
): Promise<{ blob: Blob; filename?: string }> {
  const res = await fetch(`${API}/api/db/dump`, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...authHeaders() },
    body: JSON.stringify(
      body(c, opts.sessionId, { format: opts.mode, table: opts.table, database: opts.database || c.database }),
    ),
  });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error((data as { error?: string }).error || res.statusText || "转储失败");
  }
  const cd = res.headers.get("Content-Disposition") || "";
  const m = /filename\*?=(?:UTF-8''|\")?([^";]+)/i.exec(cd);
  const filename = m ? decodeURIComponent(m[1].replace(/"$/, "").trim()) : undefined;
  const blob = await res.blob();
  return { blob, filename };
}

/** 触发浏览器下载 blob(导出/转储共用) */
export function downloadBlob(blob: Blob, filename: string) {
  const a = document.createElement("a");
  a.href = URL.createObjectURL(blob);
  a.download = filename;
  a.click();
  URL.revokeObjectURL(a.href);
}