import { normalizeModelCompat } from "../../src/agents/model-compat.js";
import { fetchGeminiUsage } from "../../src/infra/provider-usage.fetch.js";
import { buildOauthProviderAuthResult } from "../../src/plugin-sdk/provider-auth-result.js";
import type {
  OpenClawPluginApi,
  ProviderAuthContext,
  ProviderFetchUsageSnapshotContext,
  ProviderResolveDynamicModelContext,
  ProviderRuntimeModel,
} from "../../src/plugins/types.js";
import { loginGeminiCliOAuth } from "./oauth.js";

const PROVIDER_ID = "google-gemini-cli";
const PROVIDER_LABEL = "Gemini CLI OAuth";
const DEFAULT_MODEL = "google-gemini-cli/gemini-3.1-pro-preview";
const GEMINI_3_1_PRO_PREFIX = "gemini-3.1-pro";
const GEMINI_3_1_FLASH_PREFIX = "gemini-3.1-flash";
const GEMINI_3_1_PRO_TEMPLATE_IDS = ["gemini-3-pro-preview"] as const;
const GEMINI_3_1_FLASH_TEMPLATE_IDS = ["gemini-3-flash-preview"] as const;
const ENV_VARS = [
  "OPENCLAW_GEMINI_OAUTH_CLIENT_ID",
  "OPENCLAW_GEMINI_OAUTH_CLIENT_SECRET",
  "GEMINI_CLI_OAUTH_CLIENT_ID",
  "GEMINI_CLI_OAUTH_CLIENT_SECRET",
];

function cloneFirstTemplateModel(params: {
  modelId: string;
  templateIds: readonly string[];
  ctx: ProviderResolveDynamicModelContext;
}): ProviderRuntimeModel | undefined {
  const trimmedModelId = params.modelId.trim();
  for (const templateId of [...new Set(params.templateIds)].filter(Boolean)) {
    const template = params.ctx.modelRegistry.find(
      PROVIDER_ID,
      templateId,
    ) as ProviderRuntimeModel | null;
    if (!template) {
      continue;
    }
    return normalizeModelCompat({
      ...template,
      id: trimmedModelId,
      name: trimmedModelId,
      reasoning: true,
    } as ProviderRuntimeModel);
  }
  return undefined;
}

function parseGoogleUsageToken(apiKey: string): string {
  try {
    const parsed = JSON.parse(apiKey) as { token?: unknown };
    if (typeof parsed?.token === "string") {
      return parsed.token;
    }
  } catch {
    // ignore
  }
  return apiKey;
}

async function fetchGeminiCliUsage(ctx: ProviderFetchUsageSnapshotContext) {
  return await fetchGeminiUsage(ctx.token, ctx.timeoutMs, ctx.fetchFn, PROVIDER_ID);
}

function resolveGeminiCliForwardCompatModel(
  ctx: ProviderResolveDynamicModelContext,
): ProviderRuntimeModel | undefined {
  const trimmed = ctx.modelId.trim();
  const lower = trimmed.toLowerCase();

  let templateIds: readonly string[];
  if (lower.startsWith(GEMINI_3_1_PRO_PREFIX)) {
    templateIds = GEMINI_3_1_PRO_TEMPLATE_IDS;
  } else if (lower.startsWith(GEMINI_3_1_FLASH_PREFIX)) {
    templateIds = GEMINI_3_1_FLASH_TEMPLATE_IDS;
  } else {
    return undefined;
  }

  return cloneFirstTemplateModel({
    modelId: trimmed,
    templateIds,
    ctx,
  });
}

export function registerGoogleGeminiCliProvider(api: OpenClawPluginApi) {
  api.registerProvider({
    id: PROVIDER_ID,
    label: PROVIDER_LABEL,
    docsPath: "/providers/models",
    aliases: ["gemini-cli"],
    envVars: ENV_VARS,
    auth: [
      {
        id: "oauth",
        label: "Google OAuth",
        hint: "PKCE + localhost callback",
        kind: "oauth",
        run: async (ctx: ProviderAuthContext) => {
          const spin = ctx.prompter.progress("Starting Gemini CLI OAuth…");
          try {
            const result = await loginGeminiCliOAuth({
              isRemote: ctx.isRemote,
              openUrl: ctx.openUrl,
              log: (msg) => ctx.runtime.log(msg),
              note: ctx.prompter.note,
              prompt: async (message) => String(await ctx.prompter.text({ message })),
              progress: spin,
            });

            spin.stop("Gemini CLI OAuth complete");
            return buildOauthProviderAuthResult({
              providerId: PROVIDER_ID,
              defaultModel: DEFAULT_MODEL,
              access: result.access,
              refresh: result.refresh,
              expires: result.expires,
              email: result.email,
              credentialExtra: { projectId: result.projectId },
              notes: ["If requests fail, set GOOGLE_CLOUD_PROJECT or GOOGLE_CLOUD_PROJECT_ID."],
            });
          } catch (err) {
            spin.stop("Gemini CLI OAuth failed");
            await ctx.prompter.note(
              "Trouble with OAuth? Ensure your Google account has Gemini CLI access.",
              "OAuth help",
            );
            throw err;
          }
        },
      },
    ],
    resolveDynamicModel: (ctx) => resolveGeminiCliForwardCompatModel(ctx),
    resolveUsageAuth: async (ctx) => {
      const auth = await ctx.resolveOAuthToken();
      if (!auth) {
        return null;
      }
      return {
        ...auth,
        token: parseGoogleUsageToken(auth.token),
      };
    },
    fetchUsageSnapshot: async (ctx) => await fetchGeminiCliUsage(ctx),
  });
}