/**
 * 后端 API 客户端。基址走 NEXT_PUBLIC_API_BASE,缺省指向本地后端 :8000。
 *
 * JSON 契约与后端 schemas.py 对齐(camelCase),所以返回体可直接喂给页面 state。
 * 注意:api_key 读取时后端永远打码,写回打码占位符表示"不改 key"(写时哨兵)。
 */

import { loginPathWithReturnTo } from "@/lib/auth-redirect";

export const API_BASE =
  process.env.NEXT_PUBLIC_API_BASE_URL ?? "http://localhost:8000";

export type ModelType = "LLM" | "ASR" | "TTS" | "Realtime" | "Embedding" | "Agent";

function formatErrorDetail(detail: unknown): string | null {
  if (typeof detail === "string") return detail;
  if (Array.isArray(detail)) {
    const messages = detail
      .map((item) => {
        if (!item || typeof item !== "object") return null;
        const record = item as { loc?: unknown; msg?: unknown };
        const message = typeof record.msg === "string" ? record.msg : null;
        if (!message) return null;
        const path = Array.isArray(record.loc)
          ? record.loc
              .filter((part) => part !== "body")
              .map(String)
              .join(".")
          : "";
        return path ? `${path}：${message}` : message;
      })
      .filter((message): message is string => Boolean(message));
    return messages.length ? messages.join("；") : null;
  }
  if (detail && typeof detail === "object") {
    const record = detail as { message?: unknown; msg?: unknown };
    if (typeof record.message === "string") return record.message;
    if (typeof record.msg === "string") return record.msg;
  }
  return null;
}

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const isFormData = init?.body instanceof FormData;
  const res = await fetch(`${API_BASE}${path}`, {
    headers: isFormData ? undefined : { "Content-Type": "application/json" },
    credentials: "include",
    ...init,
  });
  if (
    res.status === 401 &&
    typeof window !== "undefined" &&
    !path.startsWith("/api/auth/")
  ) {
    window.location.href = loginPathWithReturnTo(
      window.location.pathname + window.location.search,
    );
  }
  if (!res.ok) {
    let detail = `请求失败 (${res.status})`;
    try {
      const body = (await res.json()) as { detail?: unknown };
      detail = formatErrorDetail(body?.detail) ?? detail;
    } catch {
      // 响应体不是 JSON,沿用默认错误信息
    }
    throw new Error(detail);
  }
  // 204 / 空响应保护
  const text = await res.text();
  return (text ? JSON.parse(text) : undefined) as T;
}

export type AdminUser = {
  username: string;
  displayName: string;
  role: "super_admin";
};

export const authApi = {
  login: (body: { username: string; password: string }) =>
    request<AdminUser>("/api/auth/login", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  logout: () =>
    request<{ ok: boolean }>("/api/auth/logout", {
      method: "POST",
    }),
  me: () => request<AdminUser>("/api/auth/me"),
};

// ---------- 接口定义驱动的模型注册表 ----------
export type InterfaceField = {
  key: string;
  label: string;
  group: "values" | "secrets";
  type: "text" | "url" | "password" | "number" | "boolean" | "select";
  required: boolean;
  default?: unknown;
  options?: string[];
};

export type InterfaceDefinition = {
  interfaceType: string;
  name: string;
  capability: ModelType;
  fieldSchema: { fields: InterfaceField[] };
  enabled: boolean;
  version: number;
};

export type ModelResource = {
  id: string;
  name: string;
  capability: ModelType;
  interfaceType: string;
  values: Record<string, unknown>;
  secrets: Record<string, unknown>;
  supportImageInput: boolean;
  enabled: boolean;
  isDefault: boolean;
  updatedAt?: string | null;
};

export type ModelResourceUpsert = Omit<
  ModelResource,
  "id" | "capability" | "updatedAt"
>;

export type ModelResourceTestResult = {
  ok: boolean;
  latencyMs: number | null;
  message: string;
  detail: string;
};

export const interfaceDefinitionsApi = {
  list: (capability?: ModelType) =>
    request<InterfaceDefinition[]>(
      `/api/interface-definitions${capability ? `?capability=${capability}` : ""}`,
    ),
};

export const modelResourcesApi = {
  list: () => request<ModelResource[]>("/api/model-resources"),
  create: (body: ModelResourceUpsert) =>
    request<ModelResource>("/api/model-resources", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: ModelResourceUpsert) =>
    request<ModelResource>(`/api/model-resources/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  test: (body: ModelResourceUpsert, id?: string) =>
    request<ModelResourceTestResult>(
      id ? `/api/model-resources/${id}/test` : "/api/model-resources/test",
      {
        method: "POST",
        body: JSON.stringify(body),
      },
    ),
  duplicate: (id: string) =>
    request<ModelResource>(`/api/model-resources/${id}/duplicate`, {
      method: "POST",
    }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/model-resources/${id}`, {
      method: "DELETE",
    }),
};

// ---------- 助手 ----------
export type AssistantType =
  | "prompt"
  | "workflow"
  | "dify"
  | "fastgpt"
  | "opencode";
export type RuntimeMode = "pipeline" | "realtime";
export type TurnConfig = {
  bargeIn: {
    strategy: "vad" | "transcription";
  };
  vad: {
    confidence: number;
    startSecs: number;
    stopSecs: number;
    minVolume: number;
  };
  turnDetection: {
    strategy: "silence" | "smart_turn";
    silenceTimeoutSecs: number;
  };
};

/** 后端 AssistantOut(宽表 STI:瘦字段平铺,workflow 用 graph)。apiKey 读时打码 */
export type Assistant = {
  id: string;
  name: string;
  type: AssistantType;
  runtimeMode: RuntimeMode;
  greeting: string;
  enableInterrupt: boolean;
  turnConfig: TurnConfig;
  visionEnabled: boolean;
  visionModelResourceId: string | null;
  modelResourceIds: Partial<Record<ModelType, string>>;
  knowledgeBaseId: string | null;
  knowledgeRetrievalConfig: KnowledgeRetrievalConfig;
  toolIds: string[];
  prompt: string;
  dynamicVariableDefinitions: Record<string, DynamicVariableDefinition>;
  apiUrl: string;
  apiKey: string;
  appId: string;
  graph: Record<string, unknown>;
  updatedAt?: string | null;
};

export type DynamicVariableDefinition = {
  type: "string" | "number" | "boolean";
  required: boolean;
  default: string | number | boolean | null;
};

export type KnowledgeRetrievalConfig = {
  mode: "automatic" | "on_demand";
  topN: number;
  scoreThreshold: number;
};

export type AssistantUpsert = Omit<Assistant, "id" | "updatedAt">;

export const assistantsApi = {
  list: () => request<Assistant[]>("/api/assistants"),
  get: (id: string) => request<Assistant>(`/api/assistants/${id}`),
  create: (body: AssistantUpsert) =>
    request<Assistant>("/api/assistants", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: AssistantUpsert) =>
    request<Assistant>(`/api/assistants/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  // 服务端整行复制(含真 key,密钥不经浏览器)
  duplicate: (id: string) =>
    request<Assistant>(`/api/assistants/${id}/duplicate`, { method: "POST" }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/assistants/${id}`, { method: "DELETE" }),
};

// ---------- 对话历史 ----------
export type Conversation = {
  id: string;
  assistantId: string | null;
  assistantName: string;
  channel: string;
  runtimeMode: string;
  status: string;
  messageCount: number;
  startedAt: string;
  endedAt: string | null;
};

export type ConversationMessage = {
  id: string;
  sequence: number;
  role: "user" | "assistant";
  contentType: string;
  content: string;
  occurredAt: string;
  extra: { interrupted?: boolean; turn_id?: string };
};

export type ConversationDetail = Conversation & {
  messages: ConversationMessage[];
};

export type ConversationList = {
  items: Conversation[];
  total: number;
  page: number;
  pageSize: number;
};

export const conversationsApi = {
  list: (params: {
    page?: number;
    pageSize?: number;
    search?: string;
    channel?: string;
    status?: string;
    sortOrder?: "newest" | "oldest";
  } = {}) => {
    const query = new URLSearchParams({
      page: String(params.page ?? 1),
      page_size: String(params.pageSize ?? 20),
      sort_order: params.sortOrder ?? "newest",
    });
    if (params.search) query.set("search", params.search);
    if (params.channel) query.set("channel", params.channel);
    if (params.status) query.set("status", params.status);
    return request<ConversationList>(`/api/conversations?${query}`);
  },
  get: (id: string) =>
    request<ConversationDetail>(`/api/conversations/${id}`),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/conversations/${id}`, { method: "DELETE" }),
};

// ---------- 工具 ----------
export type ToolStatus = "active" | "archived" | "draft";
export type ToolParameter = {
  name: string;
  type: "string" | "number" | "integer" | "boolean" | "object" | "array";
  location: "path" | "query" | "body" | "header";
  description: string;
  required: boolean;
};

export type EndCallToolDefinition = {
  schemaVersion: number;
  type: "end_call";
  config: {
    messageType: "none" | "custom";
    customMessage: string;
    captureReason: boolean;
  };
};

export type HttpToolDefinition = {
  schemaVersion: number;
  type: "http";
  config: {
    method: "GET" | "POST" | "PUT" | "PATCH" | "DELETE";
    url: string;
    timeoutSeconds: number;
    headers: Record<string, string>;
    parameters: ToolParameter[];
    body: Record<string, unknown>;
    dynamicVariableAssignments: Record<string, string>;
  };
};

export type McpToolDefinition = {
  schemaVersion: number;
  type: "mcp";
  config: {
    remoteToolName: string;
    inputSchema: Record<string, unknown>;
    schemaHash: string;
    dynamicVariableAssignments: Record<string, string>;
  };
};

export type Tool = {
  id: string;
  name: string;
  functionName: string;
  type: "end_call" | "http" | "mcp";
  description: string;
  definition: EndCallToolDefinition | HttpToolDefinition | McpToolDefinition;
  secrets: Record<string, unknown>;
  status: ToolStatus;
  mcpServerId?: string | null;
  remoteToolName?: string | null;
  updatedAt?: string | null;
};

export type ToolUpsert = Omit<
  Tool,
  "id" | "type" | "remoteToolName" | "updatedAt"
>;

export const toolsApi = {
  list: () => request<Tool[]>("/api/tools"),
  create: (body: ToolUpsert) =>
    request<Tool>("/api/tools", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: ToolUpsert) =>
    request<Tool>(`/api/tools/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/tools/${id}`, { method: "DELETE" }),
  duplicate: (id: string) =>
    request<Tool>(`/api/tools/${id}/duplicate`, { method: "POST" }),
};

export type McpServer = {
  id: string;
  name: string;
  description: string;
  transport: "streamable_http";
  url: string;
  timeoutSeconds: number;
  headers: Record<string, string>;
  secretHeaders: Record<string, string>;
  status: ToolStatus;
  toolCount: number;
  lastSyncedAt?: string | null;
  updatedAt?: string | null;
};

export type McpServerUpsert = Omit<
  McpServer,
  "id" | "toolCount" | "lastSyncedAt" | "updatedAt"
>;

export type McpSyncResult = {
  server: McpServer;
  created: number;
  updated: number;
  tools: Tool[];
};

export const mcpServersApi = {
  list: () => request<McpServer[]>("/api/mcp-servers"),
  create: (body: McpServerUpsert) =>
    request<McpServer>("/api/mcp-servers", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: McpServerUpsert) =>
    request<McpServer>(`/api/mcp-servers/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  sync: (id: string) =>
    request<McpSyncResult>(`/api/mcp-servers/${id}/sync`, {
      method: "POST",
    }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/mcp-servers/${id}`, {
      method: "DELETE",
    }),
};

// ---------- 知识库 ----------
export type KnowledgeBase = {
  id: string;
  name: string;
  description: string;
  embeddingModelResourceId: string | null;
  status: string;
  updatedAt?: string | null;
};

export type KnowledgeDocument = {
  id: string;
  knowledgeBaseId: string;
  name: string;
  sourceType: "file" | "text";
  mimeType: string;
  sizeBytes: number;
  status: string;
  errorMessage: string;
  chunkCount: number;
  createdAt?: string | null;
};

export type KnowledgeSearchResult = {
  content: string;
  document: string;
  score: number;
};

export type KnowledgeChunk = {
  id: string;
  chunkIndex: number;
  content: string;
};

export type KnowledgeBaseUpsert = Pick<
  KnowledgeBase,
  "name" | "description" | "embeddingModelResourceId"
>;

export const knowledgeBasesApi = {
  list: () => request<KnowledgeBase[]>("/api/knowledge-bases"),
  get: (id: string) => request<KnowledgeBase>(`/api/knowledge-bases/${id}`),
  create: (body: KnowledgeBaseUpsert) =>
    request<KnowledgeBase>("/api/knowledge-bases", { method: "POST", body: JSON.stringify(body) }),
  update: (id: string, body: KnowledgeBaseUpsert) =>
    request<KnowledgeBase>(`/api/knowledge-bases/${id}`, { method: "PUT", body: JSON.stringify(body) }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/knowledge-bases/${id}`, { method: "DELETE" }),
  documents: (id: string) =>
    request<KnowledgeDocument[]>(`/api/knowledge-bases/${id}/documents`),
  addText: (id: string, body: { name: string; content: string }) =>
    request<KnowledgeDocument>(`/api/knowledge-bases/${id}/documents/text`, {
      method: "POST", body: JSON.stringify(body),
    }),
  addFile: (id: string, file: File) => {
    const body = new FormData();
    body.append("file", file);
    return request<KnowledgeDocument>(`/api/knowledge-bases/${id}/documents/file`, {
      method: "POST", body,
    });
  },
  removeDocument: (id: string, documentId: string) =>
    request<{ ok: boolean }>(`/api/knowledge-bases/${id}/documents/${documentId}`, {
      method: "DELETE",
    }),
  retryDocument: (id: string, documentId: string) =>
    request<KnowledgeDocument>(`/api/knowledge-bases/${id}/documents/${documentId}/retry`, {
      method: "POST",
    }),
  chunks: (id: string, documentId: string) =>
    request<KnowledgeChunk[]>(`/api/knowledge-bases/${id}/documents/${documentId}/chunks`),
  search: (id: string, query: string, topK = 5) =>
    request<KnowledgeSearchResult[]>(`/api/knowledge-bases/${id}/search`, {
      method: "POST", body: JSON.stringify({ query, topK }),
    }),
};

// ---------- 工作流节点类型目录 ----------
export type NodeFieldSpec = {
  key: string;
  label: string;
  type: "text" | "textarea" | "switch";
  required?: boolean;
  default?: unknown;
};

export type NodeConstraints = {
  minIncoming?: number;
  maxIncoming?: number;
  minOutgoing?: number;
  maxOutgoing?: number;
  minInstances?: number;
  maxInstances?: number;
};

export type NodeSpecDto = {
  name: string;
  displayName: string;
  category: string;
  description: string;
  icon: string;
  accent: string;
  addable: boolean;
  constraints: NodeConstraints;
  fields: NodeFieldSpec[];
};

export type NodeTypesResponse = {
  specVersion: string;
  nodeTypes: NodeSpecDto[];
};

export const nodeTypesApi = {
  list: () => request<NodeTypesResponse>("/api/node-types"),
};

export type IceServerConfig = {
  urls: string | string[];
  username?: string;
  credential?: string;
};

export const webrtcApi = {
  iceServers: () =>
    request<{ iceServers: IceServerConfig[] }>("/api/webrtc/ice-servers"),
};