// The building / improvement card. The city buildings tab and the HUD's tile
// improvement panel draw one card per type: an icon, a name and a status up
// top, then an action button carrying only the estimated price and the build
// time. What the work produces, consumes and costs lives in a hover tooltip, so
// the card itself stays bare. Shared by both panels so they read the same.

import { resourceById } from "../../../shared/data.js";
import { formatResourceAmount } from "../../../shared/resources.js";
import { groupDigits } from "../../../shared/text_format.js";

// The materials a construction bills in, in reading order.
export const CARD_RESOURCES = ["steel", "energy", "hightech"];

// A commodity's icon as an image node, for a row that names a resource with a
// picture rather than the word.
export function resourceIcon(id) {
  const proto = resourceById(id);
  const $img = $("<img>");
  if (proto) $img.attr("src", `assets/${proto.icon}`).attr("alt", proto.name);
  return $img;
}

// A resource amount with its commodity icon. `sign` marks the direction of the
// flow: "+" for output, "−" for a cost.
function resourceLine(id, amount, sign) {
  const proto = resourceById(id);
  const $span = $("<span class='res'></span>");
  if (proto) {
    $span.append($("<img>").attr("src", `assets/${proto.icon}`).attr("alt", proto.name));
  }
  $span.append(document.createTextNode(`${sign}${formatResourceAmount(id, amount)}`));
  return $span;
}

// A research-point figure with its erlenmeyer icon. The icon stands in for the
// word "research", so no unit text follows: the science buildings, the
// technology cards and the research rate all read the same way.
export function researchNode(amount, { sign = "", decimals = 0 } = {}) {
  const proto = resourceById("research");
  const $span = $("<span class='res research-points'></span>");
  if (proto) {
    $span.append($("<img>").attr("src", `assets/${proto.icon}`).attr("alt", proto.name));
  }
  const value = Number(amount) || 0;
  const text = decimals > 0 ? value.toFixed(decimals) : groupDigits(Math.round(value));
  $span.append(document.createTextNode(`${sign}${text}`));
  return $span;
}

// An inline resource bill for a card: a muted label, then one icon-and-amount
// per material, then an optional suffix. Used for a unit's daily upkeep, which
// is paid in materials rather than money.
export function resourceBill(items, { label = "", sign = "−", suffix = "" } = {}) {
  const $bill = $("<span class='bt-bill'></span>");
  if (label) $bill.append($("<span class='bt-bill-label'></span>").text(label));
  for (const item of items) $bill.append(resourceLine(item.id, item.amount, sign));
  if (suffix) $bill.append($("<span class='bt-bill-suffix'></span>").text(suffix));
  return $bill;
}

// The three tooltip sections from a work's flows. Each entry is a resource
// { id, amount } or free text { text }; free text is shown exactly as written.
// `desc` is an optional prose line shown first, with no section heading.
export function tooltipSections({
  desc = "",
  produce = [],
  produceSuffix = "",
  consume = [],
  consumeSuffix = "",
  cost = [],
} = {}) {
  const sections = [
    { label: "Produces", cls: "tip-produce", sign: "+", suffix: produceSuffix, items: produce },
    { label: "Consumes", cls: "tip-consume", sign: "−", suffix: consumeSuffix, items: consume },
    { label: "Costs", cls: "tip-cost", sign: "−", suffix: "", items: cost },
  ];
  if (desc) sections.unshift({ desc });
  return sections;
}

let $tooltip = null;

// Removes any open card tooltip. Called on mouseleave and whenever the panel
// rebuilds, so a stale tooltip never lingers over fresh content.
export function hideCardTooltip() {
  if ($tooltip) {
    $tooltip.remove();
    $tooltip = null;
  }
}

// Opens the tooltip beside `$anchor`, flipping left or up when it would run off
// the viewport. It is fixed to the body, so a scrolling card list never clips
// it.
export function showCardTooltip($anchor, sections) {
  hideCardTooltip();
  if (!$anchor || !$anchor.length) return;
  if (!sections || !sections.length) return;
  $tooltip = $("<div class='card-tooltip'></div>");
  for (const section of sections) {
    if (section.desc) {
      $tooltip.append($("<div class='tip-section tip-desc'></div>").text(section.desc));
      continue;
    }
    const $section = $("<div class='tip-section'></div>");
    $section.append($("<div class='tip-head'></div>").text(section.label));
    if (!section.items || section.items.length === 0) {
      $section.append($("<div class='tip-line tip-none'></div>").text("nothing"));
    } else {
      for (const item of section.items) {
        const $line = $("<div></div>").addClass(`tip-line ${section.cls}`);
        if (item.node) $line.append(item.node);
        else if (item.id) $line.append(resourceLine(item.id, item.amount, section.sign));
        else $line.text(item.text);
        if (section.suffix) $line.append(document.createTextNode(section.suffix));
        $section.append($line);
      }
    }
    $tooltip.append($section);
  }
  $("body").append($tooltip);
  const rect = $anchor[0].getBoundingClientRect();
  $tooltip.css({ left: rect.right + 10, top: rect.top });
  const tip = $tooltip[0].getBoundingClientRect();
  if (tip.right > window.innerWidth - 8 && tip.width) {
    $tooltip.css("left", rect.left - tip.width - 10);
  }
  if (tip.bottom > window.innerHeight - 8) {
    $tooltip.css("top", Math.max(8, window.innerHeight - tip.height - 8));
  }
}

// Puts the action button's material cost and build time in its meta line.
// `resources` is the work's material bill (an array of { id, amount }), drawn
// with the commodity icons and a minus sign; the hours follow it. A work with
// nothing to spend (locked, or already standing) shows nothing. Callers whose
// cost is not a resource bill pass free `text` instead, shown verbatim. The
// estimated euro price lives in the hover tooltip, never here, so a long bill
// cannot overflow the button.
export function setCardMeta($meta, { resources = null, hours = "", text = "" } = {}) {
  $meta.empty();
  if (resources && resources.length) {
    $meta.append(resourceBill(resources, { sign: "−" }));
    if (hours) $meta.append(document.createTextNode(`  ·  ${hours}`));
  } else if (text) {
    $meta.text(text);
  } else if (hours) {
    $meta.text(hours);
  }
}

// Builds a card. `spec` carries:
//   icon, name, status, statusBuilt, built, locked
//   note                (a muted line under the header, e.g. a unit's upkeep)
//   action  { label, money, hours, text, disabled }
//   progress            (the action button carries a fill the caller sets,
//                        e.g. focused research; label and meta sit above it)
//   remove  { label, title, enabled }   (omit for no remove control)
//   tip     () => tooltip sections
//   onAction, onRemove
// It returns the pieces the caller keeps to refresh the card in place.
export function buildCard(spec) {
  const $card = $("<div class='building-tile'></div>");
  if (spec.built) $card.addClass("built");
  if (spec.locked) $card.addClass("locked");

  const $top = $("<div class='bt-top'></div>");
  if (spec.icon) {
    $top.append(
      $("<img class='building-icon'>").attr("src", `assets/${spec.icon}`).attr("alt", spec.name)
    );
  }
  const $id = $("<div class='bt-id'></div>");
  $id.append($("<div class='bt-name'></div>").text(spec.name));
  const $status = $("<div class='bt-level'></div>")
    .text(spec.status || "")
    .toggleClass("built", !!spec.statusBuilt);
  $id.append($status);
  $top.append($id);
  $card.append($top);

  let $note = null;
  if (spec.note) {
    $note = $("<div class='bt-note'></div>");
    if (typeof spec.note === "string") $note.text(spec.note);
    else $note.append(spec.note);
    $card.append($note);
  }

  const action = spec.action || {};
  const $action = $("<button class='aero bt-upgrade'></button>").prop("disabled", !!action.disabled);
  // A progress fill lives behind the button's own label and meta, so the
  // button itself reads as the bar.
  let $progressFill = null;
  if (spec.progress) {
    $progressFill = $("<span class='bt-progress-fill'></span>");
    $action.append($progressFill);
  }
  $action.append($("<span class='bt-up-label'></span>").text(action.label || ""));
  const $meta = $("<span class='bt-meta'></span>");
  setCardMeta($meta, action);
  $action.append($meta);
  $card.append($action);
  if (spec.onAction) $action.on("click", spec.onAction);
  if (spec.tip) {
    $action.on("mouseenter", () => showCardTooltip($action, spec.tip()));
    $action.on("mouseleave", hideCardTooltip);
  }

  let $remove = null;
  if (spec.remove) {
    $remove = $("<button class='aero bt-downgrade'></button>")
      .text(spec.remove.label || "✕")
      .attr("title", spec.remove.title || "")
      .prop("disabled", !spec.remove.enabled);
    if (spec.onRemove) $remove.on("click", spec.onRemove);
    $card.append($remove);
  }

  return {
    $card,
    $status,
    $action,
    $label: $action.find(".bt-up-label"),
    $meta,
    $remove,
    $note,
    $progressFill,
  };
}