import { z } from "zod";
import { Id, Timestamp } from "./common.ts";

// Pi 模型上游(W7-A):一个上游 = 一个 pi-ai provider 的一份凭据(API Key / 订阅登录 token / 环境凭据)。
// 同一 provider 可以建多个上游(例如两个 Codex 账号);Agent 运行按上游 id 取凭据。
// 研究结论与映射见 docs/design/pi-providers.md;provider 列表锁定 pi-ai 0.99.2 的 builtinProviders()。

/** pi-ai 0.99.2 内置的 42 个 provider id(含 TypeSafe 分类服务) */
export const PI_BUILTIN_PROVIDER_IDS = [
  "amazon-bedrock",
  "ant-ling",
  "anthropic",
  "azure-openai-responses",
  "baseten",
  "cerebras",
  "cloudflare-ai-gateway",
  "cloudflare-workers-ai",
  "deepseek",
  "fireworks",
  "github-copilot",
  "google",
  "google-vertex",
  "groq",
  "huggingface",
  "kimi-coding",
  "meta",
  "minimax",
  "minimax-cn",
  "mistral",
  "moonshotai",
  "moonshotai-cn",
  "nvidia",
  "openai",
  "openai-codex",
  "opencode",
  "opencode-go",
  "openrouter",
  "qwen-token-plan",
  "qwen-token-plan-cn",
  "qwen-token-plan-individual",
  "radius",
  "together",
  "typesafe",
  "vercel-ai-gateway",
  "xai",
  "xiaomi",
  "xiaomi-token-plan-ams",
  "xiaomi-token-plan-cn",
  "xiaomi-token-plan-sgp",
  "zai",
  "zai-coding-cn",
] as const;

/**
 * 上游可选的 provider:42 个内置 + openai-compatible(自定义 OpenAI 兼容端点,必须填 baseUrl 与模型)
 * + fake(脚本化假模型,不联网,演示与测试用)。
 */
export const PiProviderId = z.enum([...PI_BUILTIN_PROVIDER_IDS, "openai-compatible", "fake"]);
export type PiProviderId = z.infer<typeof PiProviderId>;

/** api_key:存一把 key(可附带 env);oauth:订阅登录 token 包;none:不存密钥(fake、无鉴权本地端点、云环境凭据链) */
export const PiAuthKind = z.enum(["api_key", "oauth", "none"]);
export type PiAuthKind = z.infer<typeof PiAuthKind>;

/**
 * 上游状态(服务端维护,只读):
 * ok = 凭据就绪;auth_required = 需要填 key 或登录;expired = OAuth 刷新失败,需要重新登录;error = 最近一次测试/调用失败
 */
export const PiUpstreamStatus = z.enum(["ok", "auth_required", "expired", "error"]);
export type PiUpstreamStatus = z.infer<typeof PiUpstreamStatus>;

/** pi 的思考档位(比 settings.ThinkingLevel 多一个 max) */
export const PiThinkingLevel = z.enum(["off", "minimal", "low", "medium", "high", "xhigh", "max"]);
export type PiThinkingLevel = z.infer<typeof PiThinkingLevel>;

/** 订阅登录方式:browser = 打开授权链接后把地址栏 URL 粘回来;device = 在任意设备输入验证码,服务端轮询 */
export const PiOAuthMode = z.enum(["browser", "device"]);
export type PiOAuthMode = z.infer<typeof PiOAuthMode>;

/** 自定义端点可选的 API 形状 */
export const PiCustomApi = z.enum([
  "openai-completions",
  "openai-responses",
  "anthropic-messages",
  "google-generative-ai",
]);
export type PiCustomApi = z.infer<typeof PiCustomApi>;

/** provider 读取的配置名(AZURE_OPENAI_BASE_URL 这类大写名;其它名字 provider 不会读) */
const EnvName = z.string().min(1).max(64);

/**
 * provider 专属的非密字段:
 * env = provider 需要的配置值(Cloudflare ACCOUNT_ID/GATEWAY_ID、Vertex project/location、Azure resource 等,见能力表 envFields);
 * api/compat/headers 只对 openai-compatible 生效。
 */
export const PiUpstreamExtra = z
  .object({
    env: z.record(EnvName, z.string().max(2048)).optional(),
    api: PiCustomApi.optional(),
    compat: z.record(z.string(), z.unknown()).optional(),
    headers: z.record(z.string().min(1).max(128), z.string().max(2048)).optional(),
    /** 自定义模型的上下文窗口(openai-compatible) */
    contextWindow: z.number().int().min(1000).max(10_000_000).optional(),
    note: z.string().max(500).optional(),
  })
  .strict();
export type PiUpstreamExtra = z.infer<typeof PiUpstreamExtra>;

// ── 能力表(GET /pi/providers) ──

export const PiModelInfo = z.object({
  id: z.string(),
  name: z.string(),
  api: z.string(),
  reasoning: z.boolean(),
  /** getSupportedThinkingLevels(model):该模型能用的思考档位 */
  thinkingLevels: z.array(PiThinkingLevel),
  contextWindow: z.number().int().nonnegative(),
  maxTokens: z.number().int().nonnegative(),
  input: z.array(z.enum(["text", "image"])),
  /** static = 随包目录;dynamic = 上游拉取(仅 Radius) */
  source: z.enum(["static", "dynamic", "custom"]),
});
export type PiModelInfo = z.infer<typeof PiModelInfo>;

export const PiEnvField = z.object({
  name: EnvName,
  label: z.string(),
  required: z.boolean(),
  hint: z.string().nullable(),
});
export type PiEnvField = z.infer<typeof PiEnvField>;

export const PiProviderGroup = z.enum(["subscription", "api_key", "cloud", "custom", "test"]);
export type PiProviderGroup = z.infer<typeof PiProviderGroup>;

export const PiProviderInfo = z.object({
  id: PiProviderId,
  name: z.string(),
  /** UI 分组:订阅登录 / API Key / 云凭据 / 自定义兼容端点 / 测试 */
  group: PiProviderGroup,
  /** 可选的认证方式;第一个是推荐项 */
  authKinds: z.array(PiAuthKind).min(1),
  /** 订阅登录;null = 不支持 */
  oauth: z
    .object({
      name: z.string(),
      /** 是否借用个人订阅(Claude Pro/Max、ChatGPT Plus/Pro 等) */
      isSubscription: z.boolean(),
      /** 可用的登录方式,第一个是推荐项(有 device 的优先 device) */
      modes: z.array(PiOAuthMode).min(1),
      /** 条款风险提示(一句事实);非订阅型为 null */
      termsNote: z.string().nullable(),
    })
    .nullable(),
  /** 订阅登录 provider 的条款风险提示(同 oauth.termsNote,便于列表直接展示) */
  termsNote: z.string().nullable(),
  /** 是否允许覆盖 baseUrl(OAuth 型与按 token 计算域名的不允许) */
  baseUrlOverridable: z.boolean(),
  defaultBaseUrl: z.string().nullable(),
  /** 需要额外填写的 env 字段 */
  envFields: z.array(PiEnvField),
  apis: z.array(z.string()),
  /** 任一模型支持思考 */
  supportsThinking: z.boolean(),
  /** 模型表可动态刷新(Radius) */
  dynamicModels: z.boolean(),
  modelCount: z.number().int().nonnegative(),
  /** 静态模型表;GET /pi/providers?models=false 时为空数组 */
  models: z.array(PiModelInfo),
  note: z.string().nullable(),
});
export type PiProviderInfo = z.infer<typeof PiProviderInfo>;

export const PiProvidersQuery = z.object({
  /** false = 不带静态模型表(只要能力与计数) */
  models: z.enum(["true", "false"]).optional(),
});
export const PiProvidersResponse = z.object({
  /** pi-ai 版本与随包模型目录生成时间 */
  piVersion: z.string(),
  catalogGeneratedAt: Timestamp.nullable(),
  providers: z.array(PiProviderInfo),
});
export type PiProvidersResponse = z.infer<typeof PiProvidersResponse>;

// ── 上游 ──

/** pi_upstream 表行(secret_ref 不出 API) */
export const PiUpstreamRow = z.object({
  id: Id,
  name: z.string().min(1).max(64),
  provider: PiProviderId,
  authKind: PiAuthKind,
  baseUrl: z.url().nullable(),
  defaultModel: z.string().min(1).max(200).nullable(),
  thinkingLevel: PiThinkingLevel,
  extra: PiUpstreamExtra,
  enabled: z.boolean(),
  status: PiUpstreamStatus,
  lastError: z.string().nullable(),
  lastVerifiedAt: Timestamp.nullable(),
  /** OAuth access token 过期时间(刷新任务据此挑选;永久 key 为 null) */
  oauthExpiresAt: Timestamp.nullable(),
  createdAt: Timestamp,
  updatedAt: Timestamp,
});
export type PiUpstreamRow = z.infer<typeof PiUpstreamRow>;

/** API 视图:不含任何密钥,只给是否已配置与掩码 */
export const PiUpstream = PiUpstreamRow.extend({
  /** 已存 key / 已登录 */
  hasCredential: z.boolean(),
  /** API Key 掩码(前 4 + 后 4);OAuth / none 为 null */
  credentialMask: z.string().nullable(),
  /** OAuth 账号信息(Codex accountId、Copilot 域名等,非密);无则 null */
  account: z.string().nullable(),
  /** 是否为 settings.pi.defaultUpstreamId */
  isDefault: z.boolean(),
});
export type PiUpstream = z.infer<typeof PiUpstream>;

export const PiUpstreamList = z.object({
  items: z.array(PiUpstream),
  defaultUpstreamId: Id.nullable(),
});
export type PiUpstreamList = z.infer<typeof PiUpstreamList>;

/** 只写;空串 = 不设置 / 不修改 */
const ApiKeyInput = z.string().max(8192);

/** 新建上游。apiKey 只写(存 secret 表);oauth 型建好后走 /oauth/start 登录 */
export const PiUpstreamCreate = z
  .object({
    name: z.string().trim().min(1).max(64),
    provider: PiProviderId,
    authKind: PiAuthKind,
    apiKey: ApiKeyInput.optional(),
    baseUrl: z.url().nullable().optional(),
    defaultModel: z.string().trim().min(1).max(200).nullable().optional(),
    thinkingLevel: PiThinkingLevel.optional(),
    extra: PiUpstreamExtra.optional(),
    enabled: z.boolean().optional(),
    /** 同时设为默认上游(settings.pi.defaultUpstreamId);没有默认上游时自动设为默认 */
    makeDefault: z.boolean().optional(),
  })
  .superRefine((v, ctx) => {
    if (v.authKind !== "api_key" && v.apiKey?.trim())
      ctx.addIssue({ code: "custom", path: ["apiKey"], message: "只有 api_key 型模型服务可以填 apiKey" });
    if (v.authKind === "oauth" && v.baseUrl)
      ctx.addIssue({ code: "custom", path: ["baseUrl"], message: "订阅登录型模型服务不能覆盖 baseUrl" });
    if (v.provider === "openai-compatible") {
      if (!v.baseUrl) ctx.addIssue({ code: "custom", path: ["baseUrl"], message: "自定义兼容端点必须填 baseUrl" });
      if (!v.defaultModel)
        ctx.addIssue({ code: "custom", path: ["defaultModel"], message: "自定义兼容端点必须填模型 id" });
    }
  });
export type PiUpstreamCreate = z.infer<typeof PiUpstreamCreate>;

/** 修改上游:provider 不可改;apiKey 传 null 清除;authKind 变化时旧凭据一并删除 */
export const PiUpstreamUpdate = z.object({
  name: z.string().trim().min(1).max(64).optional(),
  authKind: PiAuthKind.optional(),
  apiKey: ApiKeyInput.nullable().optional(),
  baseUrl: z.url().nullable().optional(),
  defaultModel: z.string().trim().min(1).max(200).nullable().optional(),
  thinkingLevel: PiThinkingLevel.optional(),
  extra: PiUpstreamExtra.optional(),
  enabled: z.boolean().optional(),
  /** true = 设为默认上游;false = 若它是默认则取消默认 */
  makeDefault: z.boolean().optional(),
});
export type PiUpstreamUpdate = z.infer<typeof PiUpstreamUpdate>;

// ── 测试 / 模型 ──

export const PiUpstreamTestRequest = z.object({
  /**
   * auth(默认)= 只解析凭据(OAuth 必要时刷新)+ 校验模型在目录中,不产生费用;
   * completion = 额外发一次最小补全(1 个输出 token,会产生极少费用)
   */
  mode: z.enum(["auth", "completion"]).optional(),
  model: z.string().min(1).max(200).optional(),
});
export type PiUpstreamTestRequest = z.infer<typeof PiUpstreamTestRequest>;

export const PiTestErrorKind = z.enum(["auth", "oauth", "model", "network", "config", "other"]);
export type PiTestErrorKind = z.infer<typeof PiTestErrorKind>;

export const PiUpstreamTestResult = z.object({
  ok: z.boolean(),
  mode: z.enum(["auth", "completion"]),
  latencyMs: z.number().int().nonnegative(),
  /** 凭据来源说明(stored credential / OAuth / AWS_PROFILE …) */
  source: z.string().nullable(),
  model: z.string().nullable(),
  errorKind: PiTestErrorKind.nullable(),
  message: z.string().nullable(),
  upstream: PiUpstream,
});
export type PiUpstreamTestResult = z.infer<typeof PiUpstreamTestResult>;

/** 模型列表来源:remote = 从上游的模型列表接口拉取(已存库);static = 随包静态目录(没拉过、拉取失败或 provider 没有列表接口) */
export const PiModelListSource = z.enum(["remote", "static"]);
export type PiModelListSource = z.infer<typeof PiModelListSource>;

/** 列表里的一个模型(字段按上游接口能给的归一化;拿不到为 null) */
export const PiListedModel = z.object({
  id: z.string().min(1).max(300),
  displayName: z.string().max(300).nullable(),
  contextWindow: z.number().int().nonnegative().nullable(),
  /** 支持图片输入 */
  supportsVision: z.boolean().nullable(),
  /** 支持工具调用 */
  supportsTools: z.boolean().nullable(),
  /** 价格(美元 / 百万 token) */
  pricing: z.object({ input: z.number().nullable(), output: z.number().nullable() }).nullable(),
  /** 这一条来自哪里:remote = 上游列表;static = 只在静态目录里 */
  origin: PiModelListSource,
});
export type PiListedModel = z.infer<typeof PiListedModel>;

/** 获取失败的分类:unsupported = provider 没有模型列表接口 */
export const PiModelFetchErrorKind = z.enum(["auth", "network", "unsupported", "config", "other"]);
export type PiModelFetchErrorKind = z.infer<typeof PiModelFetchErrorKind>;

/**
 * GET /pi/upstreams/{id}/models、POST …/models/refresh、POST /pi/models/probe 的响应。
 * models = 远程列表与静态目录合并去重(同 id 远程优先,远程缺的字段用静态目录补),远程在前。
 */
export const PiUpstreamModels = z.object({
  source: PiModelListSource,
  /** 远程列表拉取时间;static 为 null */
  fetchedAt: Timestamp.nullable(),
  models: z.array(PiListedModel),
  /** 该 provider 有模型列表接口(没有时「获取模型列表」直接回静态表) */
  remoteSupported: z.boolean(),
  /** 本次获取失败的原因(一句话,已脱敏);成功或只是读取时为 null */
  error: z.string().nullable(),
  errorKind: PiModelFetchErrorKind.nullable(),
});
export type PiUpstreamModels = z.infer<typeof PiUpstreamModels>;

/** 新建上游前试拉模型列表(不落库;凭证只用于这一次请求) */
export const PiModelsProbeRequest = z.object({
  provider: PiProviderId,
  authKind: PiAuthKind,
  apiKey: ApiKeyInput.optional(),
  baseUrl: z.url().nullable().optional(),
  extra: PiUpstreamExtra.optional(),
});
export type PiModelsProbeRequest = z.infer<typeof PiModelsProbeRequest>;

// ── 订阅登录状态机 ──

export const PiOAuthStartRequest = z.object({
  /** 缺省取能力表 oauth.modes[0] */
  mode: PiOAuthMode.optional(),
  /** GitHub Copilot:GitHub Enterprise 域名(空 = github.com) */
  enterpriseDomain: z.string().max(253).optional(),
});
export type PiOAuthStartRequest = z.infer<typeof PiOAuthStartRequest>;

/**
 * 登录会话状态:
 * pending = 等用户去授权(browser 等粘贴,device 服务端轮询中);succeeded = 已写入凭据;
 * failed = 流程报错(message 可读);expired = 会话超时;cancelled = 被新会话/登出取消
 */
export const PiOAuthState = z.enum(["pending", "succeeded", "failed", "expired", "cancelled"]);
export type PiOAuthState = z.infer<typeof PiOAuthState>;

export const PiOAuthStartResult = z.object({
  sessionId: z.string(),
  mode: PiOAuthMode,
  state: PiOAuthState,
  /** browser:在自己的浏览器打开;授权后跳到 localhost 打不开是预期的,复制地址栏完整 URL 粘回 */
  authorizeUrl: z.string().nullable(),
  /** device:在 verificationUrl 输入 userCode */
  userCode: z.string().nullable(),
  verificationUrl: z.string().nullable(),
  /** 给用户看的提示(provider 原话) */
  instructions: z.string().nullable(),
  expiresAt: Timestamp,
  message: z.string().nullable(),
});
export type PiOAuthStartResult = z.infer<typeof PiOAuthStartResult>;

export const PiOAuthCompleteRequest = z.object({
  sessionId: z.string().min(1).max(64),
  /** browser:地址栏完整 URL(或 code#state / 裸 code);device 不填 */
  pastedUrlOrCode: z.string().trim().min(1).max(8192).optional(),
  /** 本次请求最多等待多久(毫秒,默认 25s,上限 60s);超时返回 state=pending,前端再调一次 */
  waitMs: z.number().int().min(0).max(60_000).optional(),
});
export type PiOAuthCompleteRequest = z.infer<typeof PiOAuthCompleteRequest>;

export const PiOAuthCompleteResult = z.object({
  sessionId: z.string(),
  state: PiOAuthState,
  message: z.string().nullable(),
  /** 最近的进度提示(Exchanging authorization code… 等) */
  progress: z.array(z.string()),
  upstream: PiUpstream,
});
export type PiOAuthCompleteResult = z.infer<typeof PiOAuthCompleteResult>;