#!/usr/bin/env node
// bake.mjs — generate c/score.h for the maytrax C engine (americomputadora
// pattern). Reads kit.json (the freesound one-shot roster), shouts.json
// (jeffrey-pvc + apple-say drop shouts) and the hellsine church-bell, and
// emits a header of sample-path tables the C renderer loads at startup.
//
// Two root references are baked per pitched role because the original JS
// used both:
//   • detected f0  — smpNote() path (sub / reese / pad). Computed in C at
//                    load (port of detectF0), so only `pitched` is needed.
//   • nominal root — rateFor() path (lead / choir / strings / animal / wolf
//                    / bass). The kit.json `root` string → midi, baked here.
//
// usage: node c/bake.mjs

import { readFileSync, writeFileSync, existsSync } from "node:fs";
import { resolve, dirname } from "node:path";
import { fileURLToPath } from "node:url";

const HERE = dirname(fileURLToPath(import.meta.url));
const ROOT = dirname(HERE);              // pop/maytrax
const POP = dirname(ROOT);               // pop

const BPM = 160;
const SR = 48000;

const NN = { C: 0, D: 2, E: 4, F: 5, G: 7, A: 9, B: 11 };
const noteToMidi = (s) => {
  const m = /^([A-G])([#b]?)(-?\d)$/.exec(s || "C4");
  if (!m) return 60;
  return NN[m[1]] + (m[2] === "#" ? 1 : m[2] === "b" ? -1 : 0) + (parseInt(m[3], 10) + 1) * 12;
};

const kit = JSON.parse(readFileSync(resolve(ROOT, "kit.json"), "utf8"));
const roles = Object.keys(kit);

// shouts ------------------------------------------------------------------
const keyOf = {
  wake: "wake_up", real: "it_s_real", hold: "hold_on",
  let: "let_go", rabbit: "follow_the_white_rabbit", now: "now",
};
let shouts = {};
const shPath = resolve(ROOT, "shouts.json");
if (existsSync(shPath)) shouts = JSON.parse(readFileSync(shPath, "utf8"));
const shoutRows = Object.entries(keyOf).map(([k, slug]) => {
  const e = shouts[slug];
  const j = e?.path && existsSync(e.path) ? e.path : "";
  const a = e?.path ? e.path.replace(/\.wav$/, "-say-sung.wav") : "";
  return { k, j, a: a && existsSync(a) ? a : "" };
});

const bell = resolve(POP, "hellsine/samples/church-bell.wav");

// emit --------------------------------------------------------------------
const esc = (s) => s.replace(/\\/g, "\\\\").replace(/"/g, '\\"');
const L = [];
L.push("// score.h — generated by c/bake.mjs. do not hand-edit.");
L.push(`#define SCORE_BPM ${BPM}`);
L.push(`#define SCORE_SR ${SR}`);
L.push("");
L.push(`#define N_ROLES ${roles.length}`);
L.push(`static const char *ROLE_NAME[N_ROLES] = {`);
L.push("  " + roles.map((r) => `"${r}"`).join(", "));
L.push("};");
L.push(`static const char *ROLE_PATH[N_ROLES] = {`);
for (const r of roles) L.push(`  "${esc(kit[r].path)}",`);
L.push("};");
L.push(`static const int ROLE_PITCHED[N_ROLES] = {`);
L.push("  " + roles.map((r) => (kit[r].pitched ? 1 : 0)).join(", "));
L.push("};");
L.push(`// nominal root midi from kit.json (rateFor path); -1 = unpitched`);
L.push(`static const int ROLE_NOMINAL[N_ROLES] = {`);
L.push("  " + roles.map((r) => (kit[r].pitched ? noteToMidi(kit[r].root || "C4") : -1)).join(", "));
L.push("};");
L.push("");
L.push(`static const char *BELL_PATH = "${esc(bell)}";`);
L.push("");
L.push(`#define N_SHOUTS ${shoutRows.length}`);
L.push(`static const char *SHOUT_KEY[N_SHOUTS] = { ${shoutRows.map((s) => `"${s.k}"`).join(", ")} };`);
L.push(`static const char *SHOUT_J[N_SHOUTS] = {`);
for (const s of shoutRows) L.push(`  "${esc(s.j)}",`);
L.push("};");
L.push(`static const char *SHOUT_A[N_SHOUTS] = {`);
for (const s of shoutRows) L.push(`  "${esc(s.a)}",`);
L.push("};");
L.push("");

writeFileSync(resolve(HERE, "score.h"), L.join("\n") + "\n");
console.log(`✓ score.h · ${roles.length} roles · ${shoutRows.filter((s) => s.j).length}/6 jeffrey + ${shoutRows.filter((s) => s.a).length}/6 apple shouts · bell ${existsSync(bell) ? "✓" : "✗"}`);