// Vendored from packages/runtime/src/plan.ts.
// Sole change: import Skill/Action from local ./skill.ts instead of @meeseeks/schema.

import type { Action, Skill } from "./skill.ts";
import { findPlaceholders, substitute, substituteWithReport } from "./substitute.ts";

export interface StepPlan {
  id: string;
  action: Action;
  instruction: string;
  target: {
    description: string;
    bbox?: [number, number, number, number];
    ax_role?: string;
    ax_name?: string;
  };
  successCheck: string;
  fallback?: string;
}

export interface ExecutionPlan {
  skill_name: string;
  intent: string;
  domain: string;
  inputs: Record<string, string>;
  steps: StepPlan[];
  unbound_placeholders: string[];
}

export function planSkill(
  skill: Skill,
  inputs: Record<string, string> = {},
): ExecutionPlan {
  const unbound = new Set<string>();
  const collect = (s: string) => {
    for (const ph of findPlaceholders(s)) {
      const key = ph.slice(2, -2);
      if (inputs[key] === undefined && inputs[key.toLowerCase()] === undefined) {
        unbound.add(ph);
      }
    }
  };

  for (const ph of skill.meta.placeholders) {
    const key = ph.slice(2, -2);
    if (inputs[key] === undefined && inputs[key.toLowerCase()] === undefined) {
      unbound.add(ph);
    }
  }

  const steps: StepPlan[] = skill.steps.map((s) => {
    collect(s.instruction);
    collect(s.target.description);
    collect(s.successCheck);
    if (s.fallback) collect(s.fallback);

    const target: StepPlan["target"] = {
      description: substitute(s.target.description, inputs),
    };
    if (s.target.bbox) target.bbox = s.target.bbox;
    if (s.target.ax_role) target.ax_role = s.target.ax_role;
    if (s.target.ax_name) target.ax_name = s.target.ax_name;

    const step: StepPlan = {
      id: s.id,
      action: s.action,
      instruction: substitute(s.instruction, inputs),
      target,
      successCheck: substitute(s.successCheck, inputs),
    };
    if (s.fallback) step.fallback = substitute(s.fallback, inputs);
    return step;
  });

  return {
    skill_name: skill.name,
    intent: substitute(skill.intent, inputs),
    domain: skill.meta.domain,
    inputs,
    steps,
    unbound_placeholders: [...unbound].sort(),
  };
}

export { substitute, substituteWithReport, findPlaceholders };