/* Hand recorder — tap-to-build poker hands. See docs/RECORDER.md.
 *
 * Correctness by construction: each field writes a known value into a known slot,
 * so there's no LLM 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 (case, suits, 10->T, completeness), 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.
 *
 * Card entry: plain typed text for now ("ah kh", "AhKh", "7d 2c 5h"). The tap picker
 * is shelved (docs/RECORDER.md V2) — parseCards() + server normalize handle the rest.
 */
(function () {
  "use strict";

  const SUITS = { s: "♠", h: "♥", d: "♦", c: "♣" };
  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 };
  const ACTIONS = ["fold", "check", "call", "bet", "raise", "allin"];
  const SIZED = { bet: true, raise: true, allin: true };

  // --- card text -> tokens (server normalizes case/suit/10) ------------------
  function parseCards(str) {
    if (!str) return [];
    const s = String(str).trim().replace(/10/g, "T");
    if (!s) return [];
    const parts = /\s/.test(s) ? s.split(/\s+/) : s.match(/.{1,2}/g) || [];
    return parts.map((p) => p.trim()).filter(Boolean);
  }
  function cardsText(arr) {
    return arr && arr.length ? arr.join(" ") : "";
  }

  // --- 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;
      });

    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 || "",
      },
    };
  }

  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);

    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: "" },
    };
  }

  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 || {};
  }

  window.Recorder = {
    buildStructured,
    parseCards,
    parseBlinds,
    initialState,
    _internals: { POSITIONS, STREETS },
    mount,
  };

  // --- mount / render -------------------------------------------------------
  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 render(ctx) {
    const s = ctx.state;
    const hero = s.seats.find((x) => x.pos === s.heroPos) || {};
    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>
          <label class="rec-field">
            <span class="rec-label">your cards</span>
            <input class="rec-cards" data-act="hero-cards" autocapitalize="off" autocomplete="off" spellcheck="false"
                   placeholder="e.g. ah kh" value="${esc(cardsText(hero.cards))}">
          </label>
        </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-cancel" data-act="close">Cancel</button>
        <button class="rec-save" data-act="save">Save &amp; replay</button>
      </div>
    `;
  }

  function renderSeat(seat) {
    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}" autocapitalize="off" autocomplete="off"
               placeholder="name" value="${esc(seat.name || "")}">
        <input class="rec-cards sm" data-act="seat-cards" data-pos="${seat.pos}" autocapitalize="off" autocomplete="off" spellcheck="false"
               placeholder="shown?" value="${esc(cardsText(seat.cards))}">
        <button class="rec-rm" data-act="rm-seat" data-pos="${seat.pos}">✕</button>
      </div>`;
  }

  function renderStreet(ctx) {
    const s = ctx.state;
    const st = s.street;
    const players = s.seats.map((x) => x.pos);
    const boardInput =
      st === "preflop"
        ? ""
        : `<label class="rec-field">
             <span class="rec-label">${st} board (${STREET_BOARD[st]})</span>
             <input class="rec-cards" data-act="board-cards" data-street="${st}" autocapitalize="off" autocomplete="off" spellcheck="false"
                    placeholder="${st === "flop" ? "e.g. 7d 2c 5h" : "e.g. 5h"}" value="${esc(cardsText(s.board[st]))}">
           </label>`;
    return `
      ${boardInput}
      <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}: ${cardsText(s.board[st])}</div>` : ""}
        ${s.actions.filter((a) => a.street === st).map((a, i) => `<div class="rec-ln">${a.pos} <b>${a.action}</b>${a.amount != null ? " " + a.amount : ""}${a.action === "post" ? "" : ` <button class="rec-undo" data-act="rm-action" data-street="${st}" data-i="${i}">✕</button>`}</div>`).join("")}
      </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");
        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 "add-action":
        addActionFromControls(ctx);
        break;
      case "rm-action":
        removeAction(s, t.getAttribute("data-street"), parseInt(t.getAttribute("data-i"), 10));
        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 === "hero-cards") {
      const hero = ensureHero(s);
      hero.cards = parseCards(t.value);
    } else if (act === "seat-cards") {
      const seat = s.seats.find((x) => x.pos === t.getAttribute("data-pos"));
      if (seat) seat.cards = parseCards(t.value);
    } else if (act === "board-cards") {
      s.board[t.getAttribute("data-street")] = parseCards(t.value);
    } else 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);
    }
    // no re-render mid-typing (keeps input focus)
  }

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

  function removeAction(state, street, idxWithinStreet) {
    let seen = -1;
    for (let i = 0; i < state.actions.length; i++) {
      if (state.actions[i].street === street) {
        seen++;
        if (seen === idxWithinStreet) {
          state.actions.splice(i, 1);
          return;
        }
      }
    }
  }

  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]));
  }

  void SUITS;
})();