/* Hand recorder — tap-to-build poker hands. See docs/RECORDER.md.
 *
 * Correctness by construction: every tap writes a known value into a known slot,
 * so there's no parse step that can be wrong. Output is the canonical structured
 * contract (docs/HAND_HISTORY.md); the server's normalize_structured() is the final
 * authority on shape, so this stays best-effort.
 *
 * Mount-agnostic: Recorder.mount(container, opts) renders into ANY element — a
 * full-screen overlay in index.html today, a standalone recorder.html later, with
 * zero logic changes. buildStructured(state) is pure (no DOM) — the reusable core.
 */
(function () {
  "use strict";

  // --- constants ------------------------------------------------------------
  const SUITS = [
    { s: "s", sym: "♠", cls: "spade" },
    { s: "h", sym: "♥", cls: "heart" },
    { s: "d", sym: "♦", cls: "diamond" },
    { s: "c", sym: "♣", cls: "club" },
  ];
  const RANKS = ["A", "K", "Q", "J", "T", "9", "8", "7", "6", "5", "4", "3", "2"];
  const POSITIONS = ["UTG", "UTG1", "UTG2", "MP", "LJ", "HJ", "CO", "BTN", "SB", "BB"];
  const STREETS = ["preflop", "flop", "turn", "river"];
  const STREET_BOARD = { flop: 3, turn: 1, river: 1 }; // cards revealed per street
  const ACTIONS = ["fold", "check", "call", "bet", "raise", "allin"];
  const SIZED = { bet: true, raise: true, allin: true }; // actions that carry an amount

  // --- pure core: state -> contract dict (testable, no DOM) ------------------
  function buildStructured(state) {
    const players = state.seats
      .filter((s) => s.pos)
      .map((s) => {
        const p = { pos: s.pos };
        if (s.stack != null) p.stack = s.stack;
        if (s.name) p.name = s.name;
        p.cards = s.cards && s.cards.length ? s.cards.slice() : null;
        return p;
      });

    // One flat chronological action list; each street opens with its board reveal.
    const actions = [];
    for (const st of STREETS) {
      const reveal = state.board[st];
      if (st !== "preflop" && reveal && reveal.length) {
        actions.push({ street: st, board: reveal.slice() });
      }
      for (const a of state.actions.filter((x) => x.street === st)) {
        actions.push({
          street: st,
          pos: a.pos,
          action: a.action,
          amount: a.amount != null ? a.amount : null,
        });
      }
    }

    const hero = state.seats.find((s) => s.pos === state.heroPos);
    const board = [].concat(state.board.flop, state.board.turn, state.board.river);
    return {
      game: state.meta.game || "NLH",
      stakes: state.meta.stakes || null,
      hero_pos: state.heroPos || null,
      hero_cards: hero && hero.cards ? hero.cards.slice() : [],
      players,
      actions,
      board,
      result: {
        pot: state.result.pot,
        hero_net: state.result.heroNet,
        summary: state.result.summary || "",
      },
    };
  }

  // --- state construction ---------------------------------------------------
  function parseBlinds(stakes) {
    const m = (stakes || "").match(/(\d+(?:\.\d+)?)\s*\/\s*(\d+(?:\.\d+)?)/);
    return m ? { sb: parseFloat(m[1]), bb: parseFloat(m[2]) } : { sb: null, bb: null };
  }

  function initialState(hud) {
    const sess = (hud && hud.session) || {};
    const stack = (hud && hud.stack) || {};
    const blinds = parseBlinds(sess.stakes);

    // Seat known villains where Lyra has a read; hero added on position pick.
    const seats = [];
    for (const v of (hud && hud.villains) || []) {
      if (v.seat && POSITIONS.includes(v.seat)) {
        seats.push({ pos: v.seat, name: v.name || null, stack: null, cards: null });
      }
    }

    const actions = [];
    if (blinds.sb != null) actions.push({ street: "preflop", pos: "SB", action: "post", amount: blinds.sb });
    if (blinds.bb != null) actions.push({ street: "preflop", pos: "BB", action: "post", amount: blinds.bb });

    return {
      meta: {
        game: sess.game || "NLH",
        stakes: sess.stakes || null,
        venue: sess.venue || null,
        sessionId: sess.id != null ? sess.id : null,
      },
      blinds,
      heroStack: stack.current != null ? stack.current : null,
      heroPos: null,
      seats,
      street: "preflop",
      board: { flop: [], turn: [], river: [] },
      actions,
      result: { pot: null, heroNet: null, summary: "" },
      // transient editor:
      pick: null, // active card target: {type:'hero'|'board'|'seat', pos?}
      lockedSuit: null,
      pendingRank: null,
    };
  }

  // --- card picker logic ----------------------------------------------------
  function pickTargetCards(state) {
    const p = state.pick;
    if (!p) return null;
    if (p.type === "hero") {
      const hero = ensureHero(state);
      return { arr: (hero.cards = hero.cards || []), max: 2 };
    }
    if (p.type === "seat") {
      const seat = state.seats.find((s) => s.pos === p.pos);
      if (!seat) return null;
      return { arr: (seat.cards = seat.cards || []), max: 2 };
    }
    if (p.type === "board") {
      return { arr: state.board[p.street], max: STREET_BOARD[p.street] };
    }
    return null;
  }

  function pushCard(state, token) {
    const t = pickTargetCards(state);
    if (!t || t.arr.length >= t.max) return;
    t.arr.push(token);
    if (t.arr.length >= t.max) state.pick = null; // slot full -> close picker
  }

  function onSuitTap(state, suit) {
    state.lockedSuit = suit;
    if (state.pendingRank) {
      pushCard(state, state.pendingRank + suit);
      state.pendingRank = null;
    }
  }

  function onRankTap(state, rank) {
    if (state.lockedSuit) {
      pushCard(state, rank + state.lockedSuit);
    } else {
      state.pendingRank = rank; // await a suit (or x)
    }
  }

  function onUnknownSuit(state) {
    // 'x' suit: complete a pending rank as unknown-suit (e.g. "Ax"); flips
    // completeness on the server. No-op without a pending rank.
    if (state.pendingRank) {
      pushCard(state, state.pendingRank + "x");
      state.pendingRank = null;
    }
  }

  function onUnknownCard(state) {
    state.pendingRank = null;
    pushCard(state, "x"); // a card never shown
  }

  function backspaceCard(state) {
    const t = pickTargetCards(state);
    if (t && t.arr.length) t.arr.pop();
    state.pendingRank = null;
  }

  function ensureHero(state) {
    let hero = state.seats.find((s) => s.pos === state.heroPos);
    if (!hero && state.heroPos) {
      hero = { pos: state.heroPos, name: "Hero", stack: state.heroStack, cards: [] };
      state.seats.push(hero);
    }
    return hero || {};
  }

  // expose pure + helpers for testing / V2 reuse
  window.Recorder = {
    buildStructured,
    parseBlinds,
    initialState,
    _internals: { onSuitTap, onRankTap, onUnknownSuit, onUnknownCard, pushCard, POSITIONS, STREETS },
    mount,
  };

  // --- mount / render (DOM shell) ------------------------------------------
  async function mount(container, opts) {
    opts = opts || {};
    let hud = opts.hud;
    if (!hud) {
      try {
        const url = opts.sessionId != null ? `/session/data?id=${opts.sessionId}` : "/session/data";
        hud = await fetch(url).then((r) => r.json());
      } catch (e) {
        hud = { session: null };
      }
    }
    const state = initialState(hud);
    const ctx = { container, state, opts };

    container.classList.add("rec-root");
    container.addEventListener("click", (e) => handleClick(ctx, e));
    container.addEventListener("input", (e) => handleInput(ctx, e));
    render(ctx);
    return ctx;
  }

  function h(html) {
    return html;
  }

  function cardChip(token, active) {
    if (!token) return `<span class="rec-card empty${active ? " active" : ""}">+</span>`;
    if (token === "x") return `<span class="rec-card unknown">?</span>`;
    const rank = token[0];
    const suit = token[1];
    const meta = SUITS.find((x) => x.s === suit);
    const cls = meta ? meta.cls : "unknown";
    const sym = meta ? meta.sym : "?";
    return `<span class="rec-card ${cls}">${rank}<span class="rs">${sym}</span></span>`;
  }

  function render(ctx) {
    const s = ctx.state;
    const heroCards = (s.seats.find((x) => x.pos === s.heroPos) || {}).cards || [];
    ctx.container.innerHTML = `
      <div class="rec-head">
        <div class="rec-title">Record hand</div>
        <div class="rec-meta">${esc(s.meta.venue || "")}${s.meta.stakes ? " · " + esc(s.meta.stakes) : ""}</div>
        <button class="rec-x" data-act="close">✕</button>
      </div>

      <div class="rec-body">
        <section class="rec-sec">
          <div class="rec-label">Your seat</div>
          <div class="rec-pos-row">
            ${POSITIONS.map((p) => `<button class="rec-pos${s.heroPos === p ? " on" : ""}" data-act="hero-pos" data-pos="${p}">${p}</button>`).join("")}
          </div>
          <div class="rec-hero-cards" data-act="pick" data-type="hero">
            <span class="rec-label">cards</span>
            ${cardChip(heroCards[0], s.pick && s.pick.type === "hero" && heroCards.length === 0)}
            ${cardChip(heroCards[1], s.pick && s.pick.type === "hero" && heroCards.length === 1)}
          </div>
        </section>

        <section class="rec-sec">
          <div class="rec-label">Players in the hand</div>
          <div class="rec-seats">
            ${s.seats.filter((x) => x.pos !== s.heroPos).map((seat) => renderSeat(seat)).join("") || '<div class="rec-dim">none yet</div>'}
          </div>
          <div class="rec-pos-row">
            ${POSITIONS.filter((p) => p !== s.heroPos && !s.seats.some((x) => x.pos === p)).map((p) => `<button class="rec-pos add" data-act="add-seat" data-pos="${p}">+ ${p}</button>`).join("")}
          </div>
        </section>

        <section class="rec-sec">
          <div class="rec-label">Streets</div>
          <div class="rec-street-tabs">
            ${STREETS.map((st) => `<button class="rec-tab${s.street === st ? " on" : ""}" data-act="street" data-street="${st}">${st}${boardCount(s, st)}</button>`).join("")}
          </div>
          ${renderStreet(ctx)}
        </section>

        <section class="rec-sec">
          <div class="rec-label">Result</div>
          <div class="rec-result">
            <label>pot <input class="rec-num" data-act="result" data-k="pot" inputmode="decimal" value="${s.result.pot != null ? s.result.pot : ""}"></label>
            <label>your net <input class="rec-num" data-act="result" data-k="heroNet" inputmode="decimal" value="${s.result.heroNet != null ? s.result.heroNet : ""}"></label>
          </div>
        </section>
      </div>

      <div class="rec-foot">
        <button class="rec-save" data-act="save">Save &amp; replay</button>
      </div>

      ${s.pick ? renderPicker(s) : ""}
    `;
  }

  function renderSeat(seat) {
    const cards = seat.cards || [];
    return `
      <div class="rec-seat">
        <span class="rec-seat-pos">${seat.pos}</span>
        <input class="rec-name" data-act="seat-name" data-pos="${seat.pos}" placeholder="name" value="${esc(seat.name || "")}">
        <span class="rec-seat-cards" data-act="pick" data-type="seat" data-pos="${seat.pos}">
          ${cardChip(cards[0])} ${cardChip(cards[1])}
        </span>
        <button class="rec-rm" data-act="rm-seat" data-pos="${seat.pos}">✕</button>
      </div>`;
  }

  function renderStreet(ctx) {
    const s = ctx.state;
    const st = s.street;
    const board = s.board[st] || [];
    const need = STREET_BOARD[st] || 0;
    const boardSlots =
      st === "preflop"
        ? ""
        : `<div class="rec-board" data-act="pick" data-type="board" data-street="${st}">
             ${Array.from({ length: need }).map((_, i) => cardChip(board[i], s.pick && s.pick.type === "board" && s.pick.street === st && board.length === i)).join("")}
           </div>`;
    const players = s.seats.map((x) => x.pos);
    const acts = s.actions.filter((a) => a.street === st && a.action !== "post");
    return `
      ${boardSlots}
      <div class="rec-act-add">
        <select class="rec-sel" data-act="na-pos">
          <option value="">who</option>
          ${players.map((p) => `<option value="${p}">${p}${p === s.heroPos ? " (you)" : ""}</option>`).join("")}
        </select>
        <select class="rec-sel" data-act="na-action">
          <option value="">action</option>
          ${ACTIONS.map((a) => `<option value="${a}">${a}</option>`).join("")}
        </select>
        <input class="rec-num" data-act="na-amount" inputmode="decimal" placeholder="$">
        <button class="rec-add-act" data-act="add-action">add</button>
      </div>
      <div class="rec-log">
        ${(s.board[st] && s.board[st].length && st !== "preflop") ? `<div class="rec-ln brd">${st}: ${s.board[st].map((c) => cardChip(c)).join("")}</div>` : ""}
        ${s.actions.filter((a) => a.street === st).map((a) => `<div class="rec-ln">${a.pos} <b>${a.action}</b>${a.amount != null ? " " + a.amount : ""}</div>`).join("")}
      </div>`;
  }

  function renderPicker(s) {
    const pend = s.pendingRank;
    return `
      <div class="rec-picker-wrap" data-act="picker-bg">
        <div class="rec-picker" data-stop="1">
          <div class="rec-picker-head">
            ${pend ? `pick a suit for <b>${pend}</b>` : "tap a suit (locks) or a rank"}
            <button class="rec-pk-x" data-act="pick-close">done</button>
          </div>
          <div class="rec-suits">
            ${SUITS.map((su) => `<button class="rec-suit ${su.cls}${s.lockedSuit === su.s ? " on" : ""}" data-act="suit" data-s="${su.s}">${su.sym}</button>`).join("")}
            <button class="rec-suit x" data-act="xsuit">x</button>
          </div>
          <div class="rec-ranks">
            ${RANKS.map((r) => `<button class="rec-rank${pend === r ? " on" : ""}" data-act="rank" data-r="${r}">${r}</button>`).join("")}
          </div>
          <div class="rec-pk-foot">
            <button data-act="xcard">unknown card</button>
            <button data-act="backspace">⌫</button>
          </div>
        </div>
      </div>`;
  }

  function boardCount(s, st) {
    const n = (s.board[st] || []).length;
    return n ? ` ${n}` : "";
  }

  // --- events ---------------------------------------------------------------
  function handleClick(ctx, e) {
    const s = ctx.state;
    const t = e.target.closest("[data-act]");
    if (!t) return;
    const act = t.getAttribute("data-act");

    switch (act) {
      case "close":
        if (ctx.opts.onClose) ctx.opts.onClose();
        return;
      case "hero-pos": {
        const pos = t.getAttribute("data-pos");
        // moving hero seat: drop any old hero-only seat, ensure new
        const old = s.seats.find((x) => x.pos === s.heroPos);
        if (old && old.name === "Hero" && !(old.cards || []).length) {
          s.seats = s.seats.filter((x) => x !== old);
        }
        s.heroPos = s.heroPos === pos ? null : pos;
        if (s.heroPos) ensureHero(s);
        break;
      }
      case "add-seat":
        s.seats.push({ pos: t.getAttribute("data-pos"), name: null, stack: null, cards: null });
        break;
      case "rm-seat":
        s.seats = s.seats.filter((x) => x.pos !== t.getAttribute("data-pos"));
        break;
      case "street":
        s.street = t.getAttribute("data-street");
        break;
      case "pick":
        // A new slot starts neutral: first suit tapped locks for the rest of THIS slot
        // (flush flops stay fast), first rank tapped waits for its suit. The lock never
        // bleeds from one slot into the next.
        s.pick = pickFromEl(t);
        s.pendingRank = null;
        s.lockedSuit = null;
        break;
      case "pick-close":
      case "picker-bg":
        if (act === "picker-bg" && e.target.closest("[data-stop]")) return;
        s.pick = null;
        s.pendingRank = null;
        break;
      case "suit":
        onSuitTap(s, t.getAttribute("data-s"));
        break;
      case "xsuit":
        onUnknownSuit(s);
        break;
      case "rank":
        onRankTap(s, t.getAttribute("data-r"));
        break;
      case "xcard":
        onUnknownCard(s);
        break;
      case "backspace":
        backspaceCard(s);
        break;
      case "add-action":
        addActionFromControls(ctx);
        break;
      case "save":
        return doSave(ctx);
      default:
        return; // inputs handled in handleInput
    }
    render(ctx);
  }

  function handleInput(ctx, e) {
    const s = ctx.state;
    const t = e.target.closest("[data-act]");
    if (!t) return;
    const act = t.getAttribute("data-act");
    if (act === "seat-name") {
      const seat = s.seats.find((x) => x.pos === t.getAttribute("data-pos"));
      if (seat) seat.name = t.value.trim() || null;
    } else if (act === "result") {
      const k = t.getAttribute("data-k");
      s.result[k] = t.value === "" ? null : parseFloat(t.value);
    }
    // na-* and these inputs don't need a re-render mid-typing
  }

  function pickFromEl(t) {
    const type = t.getAttribute("data-type");
    if (type === "board") return { type, street: t.getAttribute("data-street") };
    if (type === "seat") return { type, pos: t.getAttribute("data-pos") };
    return { type: "hero" };
  }

  function addActionFromControls(ctx) {
    const root = ctx.container;
    const pos = root.querySelector('[data-act="na-pos"]').value;
    const action = root.querySelector('[data-act="na-action"]').value;
    const amtEl = root.querySelector('[data-act="na-amount"]');
    const amt = amtEl.value;
    if (!pos || !action) return;
    const entry = { street: ctx.state.street, pos, action };
    if (SIZED[action] && amt !== "") entry.amount = parseFloat(amt);
    else entry.amount = null;
    ctx.state.actions.push(entry);
  }

  async function doSave(ctx) {
    const structured = buildStructured(ctx.state);
    const btn = ctx.container.querySelector(".rec-save");
    if (btn) {
      btn.disabled = true;
      btn.textContent = "Saving…";
    }
    try {
      const res = await fetch("/hands", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ structured, session_id: ctx.state.meta.sessionId }),
      }).then((r) => r.json());
      if (res && res.ok) {
        if (ctx.opts.onSave) ctx.opts.onSave(res.id);
        else window.location.href = `/hand/${res.id}`;
      } else {
        throw new Error((res && res.error) || "save failed");
      }
    } catch (err) {
      if (btn) {
        btn.disabled = false;
        btn.textContent = "Save failed — retry";
      }
    }
  }

  function esc(x) {
    return String(x == null ? "" : x).replace(/[&<>"]/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;" }[c]));
  }
})();