import { tool } from "@opencode-ai/plugin";
import { openMultiModel } from "../core/open";
import { getBinaryName } from "../core/utils";

/**
 * OpenCode tool definition for launching multiple AI models in tmux sessions.
 *
 * Creates a tmux session with one window per model, each in its own git worktree.
 * Returns instructions for attaching to and cleaning up the session.
 */
export const openTool = tool({
  description: `Launch multiple OpenCode models in tmux.

Arguments:
- \`sessionName\` (string, required): tmux session name to create.
- \`models\` (array of strings, required): one or more OpenCode model IDs to launch.`,
  args: {
    sessionName: tool.schema
      .string()
      .min(1)
      .describe("tmux session name to create"),
    models: tool.schema
      .array(tool.schema.string().min(1))
      .min(1)
      .describe("one or more OpenCode model ids to launch"),
  },
  async execute(args, context) {
    const binaryName = getBinaryName();

    const result = await openMultiModel({
      sessionName: args.sessionName,
      models: args.models,
      binaryName,
      mode: "tool",
    });

    context.metadata({
      title: `multi-model ${args.sessionName}`,
      metadata: {
        safeSessionName: result.sessionName,
        modelCount: args.models.length,
      },
    });

    if (!result.success) {
      return result.error!;
    }

    return (
      result.instructions ||
      `Created session "${result.sessionName}" with ${result.windows?.length || 0} windows`
    );
  },
});