opencode

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228// The config options the plugin offers, built from the live catalog only
// (`GET /config/providers`, `GET /agent`). There is no list of models,
// modes or reasoning levels anywhere in this plugin: an empty catalog is
// an error the user sees.
import { permissionMode } from "../sdk/agent.ts";
import * as z from "zod";
import type { ConfigChoice, ConfigOption } from "convergence/protocol";
import { obj } from "./map.ts";

/// Option ids; they are also the keys of a session's stored options.
export const OPTION_MODEL = "model";
export const OPTION_AGENT = "agent";
export const OPTION_VARIANT = "variant";

export interface VariantChoice {
  value: string;
  name: string;
}

export interface ModelChoice extends ConfigChoice {
  value: string;
  name: string;
  group?: string;
  reasoningLevels?: VariantChoice[];
}

const modelSchema = z.looseObject({
  id: z.unknown().optional(),
  name: z.unknown().optional(),
  release_date: z.unknown().optional(),
  variants: z.unknown().optional(),
  limit: z.unknown().optional(),
});
const providerSchema = z.looseObject({
  id: z.unknown().optional(),
  name: z.unknown().optional(),
  models: z.unknown().optional(),
});
const agentSchema = z.looseObject({
  name: z.unknown().optional(),
  description: z.unknown().optional(),
  mode: z.unknown().optional(),
  hidden: z.unknown().optional(),
});
const catalogSchema = z.looseObject({
  providers: z.array(z.unknown()).optional(),
  default: z.unknown().optional(),
});

interface CatalogModel {
  id?: unknown;
  name?: unknown;
  release_date?: unknown;
  variants?: unknown;
  limit?: unknown;
}

export interface Providers {
  providers?: unknown;
  default?: unknown;
}

export interface AgentEntry {
  name: string;
  description: string | null;
  mode: string;
  hidden: boolean;
}

/// Display order of reasoning variants, least effort first. Only the
/// order: the names always come from the API, and a JSON object has no
/// order once parsed. Unknown names follow, alphabetically.
const VARIANT_ORDER = ["none", "minimal", "low", "medium", "high", "xhigh", "max"];

/// `"<provider>/<model>"` as `[provider, model]`; a model id may itself
/// contain slashes. `null` when either side is empty.
export function splitModel(value: unknown): [string, string] | null {
  if (typeof value !== "string") return null;
  const at = value.indexOf("/");
  if (at <= 0 || at === value.length - 1) return null;
  return [value.slice(0, at), value.slice(at + 1)];
}

/// A model's reasoning choices, ordered by effort.
export function variantChoices(model: { variants?: unknown }): VariantChoice[] {
  const variants = model?.variants && typeof model.variants === "object" ? Object.keys(model.variants) : [];
  const rank = (name: string): number => {
    const at = VARIANT_ORDER.indexOf(name);
    return at < 0 ? VARIANT_ORDER.length : at;
  };
  variants.sort((a, b) => rank(a) - rank(b) || (a < b ? -1 : a > b ? 1 : 0));
  return variants.map((name) => ({ value: name, name }));
}

/// The reasoning option: kept in the catalog whenever any model has
/// variants (so a draft can switch to a reasoning model before a session
/// exists), with the chosen model's variants as its choices and `null`
/// ("the provider default") until the user picks one.
export function reasoningOption(
  models: readonly { value: string; reasoningLevels?: VariantChoice[] }[],
  selected: unknown,
  value: unknown,
): ConfigOption | null {
  if (!models.some((model) => model.reasoningLevels?.length)) return null;
  const chosen = models.find((model) => model.value === selected);
  return {
    id: OPTION_VARIANT,
    name: "Reasoning",
    category: "reasoning",
    kind: "select",
    value: value ?? null,
    choices: chosen?.reasoningLevels ?? [],
  };
}

const lower = (text: unknown): string => String(text ?? "").toLowerCase();

/// Every option for a workspace: model (grouped by provider, newest
/// first), mode (the primary agents), reasoning, and the permission mode.
/// `providers` is `GET /config/providers`, `agents` is `GET /agent`,
/// `current` the values a chat chose.
export function buildOptions(
  providers: unknown,
  agents: unknown,
  current: Record<string, unknown> = {},
): ConfigOption[] {
  const parsedCatalog = catalogSchema.safeParse(providers);
  const catalog = parsedCatalog.success ? parsedCatalog.data : {};
  const modelChoices: ModelChoice[] = [];
  let defaultModel: string | null = null;
  const defaults = catalog.default && typeof catalog.default === "object" ? catalog.default : {};
  for (const raw of Array.isArray(catalog.providers) ? catalog.providers : []) {
    const parsedProvider = providerSchema.safeParse(raw);
    if (!parsedProvider.success || typeof parsedProvider.data.id !== "string") continue;
    const provider = parsedProvider.data;
    const providerId = parsedProvider.data.id;
    const models: CatalogModel[] = [];
    for (const entry of Object.values(provider.models && typeof provider.models === "object" ? provider.models : {})) {
      const parsedModel = modelSchema.safeParse(entry);
      if (parsedModel.success && typeof parsedModel.data.id === "string") models.push(parsedModel.data);
    }
    // Newest first, then by name; the catalog itself is unordered.
    models.sort((a, b) => {
      const left = typeof a.release_date === "string" ? a.release_date : "";
      const right = typeof b.release_date === "string" ? b.release_date : "";
      if (left !== right) return left < right ? 1 : -1;
      const an = lower(a.name ?? a.id);
      const bn = lower(b.name ?? b.id);
      return an < bn ? -1 : an > bn ? 1 : 0;
    });
    const own = obj(defaults)[providerId];
    const providerModels = obj(provider.models);
    if (defaultModel === null && typeof own === "string" && providerModels[own]) defaultModel = `${providerId}/${own}`;
    for (const model of models) {
      if (typeof model.id !== "string") continue;
      const modelId = model.id;
      const choice: ModelChoice = {
        value: `${providerId}/${modelId}`,
        name: typeof model.name === "string" && model.name ? model.name : modelId,
        group: typeof provider.name === "string" && provider.name ? provider.name : providerId,
      };
      const levels = variantChoices(model);
      if (levels.length) choice.reasoningLevels = levels;
      modelChoices.push(choice);
    }
  }
  if (!modelChoices.length) throw new Error("opencode has no connected providers; run `opencode auth login` first");

  const options: ConfigOption[] = [];
  const first = modelChoices[0];
  if (!first) throw new Error("opencode has no connected providers; run `opencode auth login` first");
  const currentModel = current[OPTION_MODEL];
  const modelValue = typeof currentModel === "string" ? currentModel : (defaultModel ?? first.value);
  options.push({
    id: OPTION_MODEL,
    name: "Model",
    category: "model",
    kind: "select",
    value: modelValue,
    choices: modelChoices,
  });

  const agentChoices: ConfigChoice[] = [];
  for (const raw of Array.isArray(agents) ? agents : []) {
    const parsed = agentSchema.safeParse(raw);
    if (!parsed.success) continue;
    const agent = parsed.data;
    if (typeof agent.name !== "string" || agent.hidden) continue;
    if (agent.mode !== "primary" && agent.mode !== "all") continue;
    const choice: ConfigChoice = { value: agent.name, name: agent.name };
    if (typeof agent.description === "string" && agent.description) choice.description = agent.description;
    agentChoices.push(choice);
  }
  if (agentChoices.length) {
    const currentAgent = current[OPTION_AGENT];
    const head = agentChoices[0];
    const value = typeof currentAgent === "string" ? currentAgent : head ? head.value : "";
    options.push({ id: OPTION_AGENT, name: "Mode", category: "mode", kind: "select", value, choices: agentChoices });
  }

  const reasoning = reasoningOption(modelChoices, modelValue, current[OPTION_VARIANT]);
  if (reasoning) options.push(reasoning);

  // OpenCode has no approval reviewer of its own, so Auto is left out
  // rather than offered as another name for Supervised.
  options.push(permissionMode.option(permissionMode.selected(current), false));
  return options;
}

/// The context window of `provider/model` in a catalog, when it names one.
export function contextWindow(providers: unknown, providerId: string, modelId: string): number | null {
  const parsedCatalog = catalogSchema.safeParse(providers);
  const entries =
    parsedCatalog.success && Array.isArray(parsedCatalog.data.providers) ? parsedCatalog.data.providers : [];
  let models: unknown = null;
  for (const raw of entries) {
    const parsed = providerSchema.safeParse(raw);
    if (parsed.success && parsed.data.id === providerId) {
      models = parsed.data.models;
      break;
    }
  }
  const model = obj(models)[modelId];
  const parsedModel = modelSchema.safeParse(model);
  if (!parsedModel.success) return null;
  const context = obj(parsedModel.data.limit)["context"];
  return typeof context === "number" && context > 0 ? context : null;
}