#!/usr/bin/env node
/**
 * pnpm work — CLI for the local work-system.
 *
 * Subcommands:
 *   rebuild-state   Rewrites docs/work/_state.json from the current markdown
 *   status          Prints a tree of all epics + their stories
 *   next            Prints the first non-done story in the first non-done epic
 */
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { buildState } from "./state-builder.mjs";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const REPO_ROOT = path.resolve(__dirname, "..", "..");
const WORK_ROOT = path.join(REPO_ROOT, "docs", "work");
const STATE_FILE = path.join(WORK_ROOT, "_state.json");

function rebuildState() {
  const state = buildState(WORK_ROOT);
  fs.writeFileSync(STATE_FILE, JSON.stringify(state, null, 2) + "\n");
  console.log(
    `Rebuilt ${path.relative(REPO_ROOT, STATE_FILE)} with ${Object.keys(state.epics).length} epic(s).`,
  );
}

function printStatus() {
  const state = buildState(WORK_ROOT);
  const epicIds = Object.keys(state.epics).sort();
  if (epicIds.length === 0) {
    console.log("No epics found under docs/work/.");
    return;
  }
  for (const epicId of epicIds) {
    const epic = state.epics[epicId];
    const storyIds = Object.keys(epic.stories).sort();
    const storyTotals = storyIds.reduce(
      (acc, sid) => ({
        total: acc.total + epic.stories[sid].ac_total,
        done: acc.done + epic.stories[sid].ac_completed,
      }),
      { total: 0, done: 0 },
    );
    const epicMark = mark(epic.status);
    console.log(
      `${epicMark} ${epicId} — ${epic.title} (${storyTotals.done}/${storyTotals.total} tasks done)`,
    );
    for (const sid of storyIds) {
      const s = epic.stories[sid];
      console.log(
        `    ${mark(s.status)} ${sid} (${s.ac_completed}/${s.ac_total}) — ${s.title}`,
      );
    }
  }
}

function printNext() {
  const state = buildState(WORK_ROOT);
  if (state.ready.length === 0) {
    if (state.blocked.length > 0) {
      console.log("No ready stories. Blocked:");
      for (const b of state.blocked) {
        console.log(
          `  ${b.epic} / ${b.story} — waiting on: ${b.waiting_on.join(", ")}`,
        );
      }
    } else {
      console.log("All epics + stories are done. ✓");
    }
    return;
  }
  const r = state.ready[0];
  console.log(`${r.epic} / ${r.story} — ${r.title}`);
  console.log(`  (use \`pnpm work ready\` to see all ready stories)`);
}

function printReady() {
  const state = buildState(WORK_ROOT);
  if (state.ready.length === 0) {
    console.log(
      "No ready stories. Run `pnpm work blocked` to see what's waiting on what.",
    );
    return;
  }
  console.log(
    `${state.ready.length} ready stor${state.ready.length === 1 ? "y" : "ies"}:`,
  );
  for (const r of state.ready) {
    console.log(`  ${r.epic} / ${r.story} — ${r.title}`);
  }
}

function printBlocked() {
  const state = buildState(WORK_ROOT);
  if (state.blocked.length === 0) {
    console.log("No blocked stories.");
    return;
  }
  console.log(
    `${state.blocked.length} blocked stor${state.blocked.length === 1 ? "y" : "ies"}:`,
  );
  for (const b of state.blocked) {
    console.log(`  ${b.epic} / ${b.story} — ${b.title}`);
    console.log(`    waiting on: ${b.waiting_on.join(", ")}`);
  }
}

function mark(status) {
  if (status === "done") return "✓";
  if (status === "in-progress") return "→";
  if (status === "blocked") return "✗";
  return "○";
}

function usage() {
  console.log(
    "Usage: pnpm work <rebuild-state|status|next|ready|blocked|dispatch>",
  );
  console.log(
    "  dispatch         Print the next dispatch plan (use --execute to invoke sandcastle)",
  );
  process.exit(2);
}

const cmd = process.argv[2];
if (cmd === "rebuild-state") rebuildState();
else if (cmd === "status") printStatus();
else if (cmd === "next") printNext();
else if (cmd === "ready") printReady();
else if (cmd === "blocked") printBlocked();
else if (cmd === "dispatch") {
  // Re-dispatch to the dispatch script so it can handle its own --execute flag
  import("./dispatch.mjs").catch((e) => {
    console.error(e);
    process.exit(1);
  });
} else usage();
