// scripts/replay-combat.js
// Drive a full combat through the LIVE backend (generic KV REST) so the player
// display window (subscribed via WS) live-updates as combat progresses.
// Uses shared/turn.js for all turn logic (same model as the UI).
//
// Run: node scripts/replay-combat.js [rounds] [delayMs]
//   rounds default 100, delayMs default 800

'use strict';

const shared = require('../shared');
const {
  buildCharacterParticipant, buildMonsterParticipant,
  startEncounter, nextTurn, applyHpChange, toggleCondition,
  endEncounter,
} = shared;

const BACKEND = process.env.BACKEND_URL || 'http://127.0.0.1:4001';
const APP_ID = process.env.REACT_APP_TRACKER_APP_ID || 'ttrpg-initiative-tracker-default';
const BASE = `artifacts/${APP_ID}/public/data`;
const ROUNDS = parseInt(process.argv[2], 10) || 100;
const DELAY = parseInt(process.argv[3], 10) || 800;

const sleep = (ms) => new Promise(r => setTimeout(r, ms));

async function api(method, path, query, body) {
  let url = `${BACKEND}${path}`;
  if (query) url += '?' + new URLSearchParams(query).toString();
  const res = await fetch(url, {
    method,
    headers: body ? { 'Content-Type': 'application/json' } : undefined,
    body: body ? JSON.stringify(body) : undefined,
  });
  if (!res.ok) {
    const t = await res.text().catch(() => '');
    throw new Error(`API ${method} ${path} ${res.status}: ${t}`);
  }
  const text = await res.text();
  return text ? JSON.parse(text) : null;
}

const docGet = (p) => api('GET', '/api/doc', { path: p }).then(r => r && r.data);
const docSet = (p, data) => api('PUT', '/api/doc', null, { path: p, data });
const docPatch = (p, patch) => api('PATCH', '/api/doc', null, { path: p, patch });

async function main() {
  console.log(`replay-combat: ${ROUNDS} rounds, ${DELAY}ms/step, backend=${BACKEND}`);

  // campaign + encounter
  const campaignId = crypto.randomUUID();
  const encounterId = crypto.randomUUID();
  const campaignPath = `${BASE}/campaigns/${campaignId}`;
  const encounterPath = `${BASE}/campaigns/${campaignId}/encounters/${encounterId}`;
  const activeDisplayPath = `${BASE}/activeDisplay/status`;

  await docSet(campaignPath, {
    name: 'Replay Campaign',
    playerDisplayBackgroundUrl: '',
    ownerId: 'replay',
    createdAt: new Date().toISOString(),
    players: [
      { id: 'c1', name: 'Fighter', defaultMaxHp: 30, defaultInitMod: 2 },
      { id: 'c2', name: 'Cleric', defaultMaxHp: 24, defaultInitMod: 1 },
      { id: 'c3', name: 'Rogue', defaultMaxHp: 22, defaultInitMod: 3 },
    ],
  });

  // build participants (roll initiative via shared)
  const chars = [
    { id: 'c1', name: 'Fighter', defaultMaxHp: 30, defaultInitMod: 2 },
    { id: 'c2', name: 'Cleric', defaultMaxHp: 24, defaultInitMod: 1 },
    { id: 'c3', name: 'Rogue', defaultMaxHp: 22, defaultInitMod: 3 },
  ];
  const monsterSpecs = [
    { name: 'Goblin1', maxHp: 8, initMod: 2 },
    { name: 'Goblin2', maxHp: 8, initMod: 2 },
    { name: 'OrcBoss', maxHp: 60, initMod: 1 },
    { name: 'Wolf', maxHp: 14, initMod: 3 },
    { name: 'Merchant', maxHp: 12, initMod: 0, isNpc: true },
  ];

  const participants = [
    ...chars.map(c => buildCharacterParticipant(c).participant),
    ...monsterSpecs.map(m => buildMonsterParticipant(m).participant),
  ];

  await docSet(encounterPath, {
    name: 'Big Boss Replay',
    campaignId,
    createdAt: new Date().toISOString(),
    participants,
    round: 0,
    currentTurnParticipantId: null,
    isStarted: false,
    isPaused: false,
    turnOrderIds: [],
  });

  console.log(`created: campaign=${campaignId} encounter=${encounterId} participants=${participants.length}`);

  // point active display so player view shows it
  await docSet(activeDisplayPath, {
    activeCampaignId: campaignId,
    activeEncounterId: encounterId,
    hidePlayerHp: false,
  });
  await sleep(1000); // let player view load

  // start
  let enc = await docGet(encounterPath);
  const start = startEncounter(enc);
  await docPatch(encounterPath, start.patch);
  enc = { ...enc, ...start.patch };
  console.log(`combat started: round ${enc.round}, first=${firstActiveName(enc)}`);
  await sleep(DELAY);

  // main loop
  for (let r = 1; r <= ROUNDS; r++) {
    enc = await docGet(encounterPath);
    const t = nextTurn(enc);
    await docPatch(encounterPath, t.patch);
    enc = { ...enc, ...t.patch };

    // damage front monster
    if (r % 2 === 0) {
      enc = await docGet(encounterPath);
      const orc = enc.participants.find(p => p.name === 'OrcBoss' && p.currentHp > 0);
      if (orc) {
        const h = applyHpChange(enc, orc.id, 'damage', 5);
        if (h.patch) { await docPatch(encounterPath, h.patch); enc = { ...enc, ...h.patch }; }
      }
    }
    if (r % 3 === 0) {
      enc = await docGet(encounterPath);
      const cleric = enc.participants.find(p => p.name === 'Cleric' && p.currentHp > 0);
      if (cleric) {
        const h = applyHpChange(enc, cleric.id, 'heal', 3);
        if (h.patch) { await docPatch(encounterPath, h.patch); enc = { ...enc, ...h.patch }; }
      }
    }
    if (r % 5 === 0) {
      enc = await docGet(encounterPath);
      const fighter = enc.participants.find(p => p.name === 'Fighter' && p.currentHp > 0);
      if (fighter) {
        const c = toggleCondition(enc, fighter.id, 'stunned');
        if (c.patch) { await docPatch(encounterPath, c.patch); enc = { ...enc, ...c.patch }; }
      }
    }

    enc = await docGet(encounterPath);
    console.log(`round ${r}: current=${firstActiveName(enc)} | round=${enc.round}`);
    await sleep(DELAY);

    if (!enc.isStarted) { console.log('combat auto-ended'); break; }
  }

  // end
  enc = await docGet(encounterPath);
  if (enc.isStarted) {
    const end = endEncounter(enc);
    if (end.patch) await docPatch(encounterPath, end.patch);
  }
  await docPatch(activeDisplayPath, { activeCampaignId: null, activeEncounterId: null });
  console.log('replay done');
}

function firstActiveName(enc) {
  if (!enc.currentTurnParticipantId) return '(none)';
  const p = enc.participants.find(x => x.id === enc.currentTurnParticipantId);
  return p ? p.name : '(missing)';
}

main().catch(err => { console.error('replay failed:', err); process.exit(1); });