import { useEffect } from "react";
import type { Bootstrap, Item, Product } from "../types.js";
import { TYPES, helpers } from "../types.js";
import { getToday, getStoredTimezone } from "../tz.js";
import { fmt, TYPE_GLYPHS } from "../format.js";
import { Btn, Pill, Icon } from "./primitives/index.js";

// Right-side drawer for an inventory instance. Shows the asset id and
// product context up top, then per-batch fields (price, THC, weight),
// audit history, and full detail rows.
export function ProductDetail({
  item,
  data,
  onClose,
  onConsume,
  onMarkGone,
  onAudit,
  onEdit,
  onCheckout,
  onCheckin,
}: {
  item: Item;
  data: Bootstrap;
  onClose: () => void;
  onConsume: (i: Item) => void;
  onMarkGone: (i: Item) => void;
  onAudit: (i: Item) => void;
  onEdit: (i: Item) => void;
  onCheckout: (i: Item) => void;
  onCheckin: (i: Item) => void;
}) {
  const bin = data.bins.find((b) => b.id === item.binId);
  const cfg = TYPES.find((t) => t.id === item.type);
  const product = data.products.find((p) => p.id === item.productId);
  const pctRemaining = helpers.pctRemaining(item, getToday(getStoredTimezone()));
  const est = helpers.estimatedRemaining(item, getToday(getStoredTimezone()));
  const last = helpers.lastAudit(item);
  const overdue = helpers.auditOverdue(item, getToday(getStoredTimezone()));
  const sinceCheck = helpers.daysSinceCheck(item, getToday(getStoredTimezone()));

  const isActive = item.status === "active";
  const isCheckedOut = item.status === "checked-out";

  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape") onClose();
    };
    document.addEventListener("keydown", handleKeyDown);
    return () => document.removeEventListener("keydown", handleKeyDown);
  }, [onClose]);

  // Sibling instances of the same product (excluding this one) — useful for
  // seeing previous purchases of the same SKU.
  const siblings = data.inventoryItems.filter(
    (i) => i.productId === item.productId && i.id !== item.id,
  );

  const detailRows: [string, React.ReactNode][] = [
    ["Asset id", <span className="mono">{item.assetId}</span>],
    ["SKU", <span className="mono">{item.sku}</span>],
    ["Type", `${item.type} · ${item.kind}`],
    ["Strain", item.name],
    ["Brand", helpers.brandName(data, item.brandId)],
    ["Shop", helpers.shopName(data, item.shopId)],
    ...(cfg?.showCannabinoidPct !== false
      ? [["Total cannabinoids", `${item.totalCannabinoids.toFixed(1)}%`] as [string, React.ReactNode]]
      : []),
    ["Purchase date", fmt.date(item.purchaseDate, getStoredTimezone())],
    ["Bin", isCheckedOut ? "In your custody" : bin ? bin.name : <span style={{ color: "var(--ink-3)" }}>—</span>],
    ["Audit cadence", `Every ${cfg?.cadenceDays ?? "—"} days · ${cfg?.auditMode ?? "—"}`],
    [
      "Cost per gram",
      item.kind === "bulk" && item.weight > 0
        ? fmt.money(item.price / item.weight)
        : item.kind === "discrete" && item.unitWeight > 0
          ? `${fmt.money(item.price / (item.countOriginal * item.unitWeight))} (effective)`
          : "—",
    ],
  ];
  if (item.status === "checked-out") {
    detailRows.push(["Checked out", fmt.date(item.checkoutDate, getStoredTimezone())]);
  }
  if (item.status === "consumed") {
    detailRows.push(
      ["Date finished", fmt.date(item.consumedDate, getStoredTimezone())],
      [
        "Lasted",
        `${Math.round((+new Date(item.consumedDate!) - +new Date(item.purchaseDate)) / 86_400_000)} days`,
      ],
    );
  }
  if (item.status === "gone") {
    detailRows.push(
      ["Date gone", fmt.date(item.goneDate, getStoredTimezone())],
      [
        "After",
        `${Math.round((+new Date(item.goneDate!) - +new Date(item.purchaseDate)) / 86_400_000)} days`,
      ],
    );
  }

  return (
    <div
      style={{
        position: "fixed",
        inset: 0,
        background: "oklch(20% 0.02 60 / 0.4)",
        zIndex: 50,
        display: "flex",
        justifyContent: "flex-end",
        animation: "backdrop-in 200ms ease-out",
      }}
      onClick={onClose}
    >
      <div
        onClick={(e) => e.stopPropagation()}
        style={{
          width: "min(720px, 100vw)",
          height: "100%",
          animation: "drawer-in 250ms ease-out",
          background: "var(--bg)",
          borderLeft: "1px solid var(--line)",
          overflow: "auto",
          boxShadow: "var(--shadow-lg)",
        }}
      >
        <div
          style={{
            padding: "20px 32px",
            borderBottom: "1px solid var(--line)",
            display: "flex",
            alignItems: "center",
            justifyContent: "space-between",
            position: "sticky",
            top: 0,
            background: "var(--bg)",
            zIndex: 1,
          }}
        >
          <div className="smallcaps" style={{ color: "var(--ink-3)" }}>
            Inventory · <span className="mono">{item.assetId}</span>
          </div>
          <div style={{ display: "flex", gap: 6, flexWrap: "wrap", justifyContent: "flex-end" }}>
            {isActive && (
              <Btn variant="ghost" icon="pocket" onClick={() => onCheckout(item)}>
                Check out
              </Btn>
            )}
            {isActive && (
              <Btn variant="ghost" icon="check" onClick={() => onAudit(item)}>
                Audit
              </Btn>
            )}
            {isCheckedOut && (
              <Btn variant="sage" icon="check" onClick={() => onCheckin(item)}>
                Check in
              </Btn>
            )}
            {(isActive || isCheckedOut) && (
              <Btn variant="secondary" icon="check" onClick={() => onConsume(item)}>
                Mark consumed
              </Btn>
            )}
            {(isActive || isCheckedOut) && (
              <Btn variant="ghost" icon="bin" onClick={() => onMarkGone(item)} />
            )}
            <Btn variant="ghost" icon="edit" onClick={() => onEdit(item)} />
            <Btn variant="ghost" icon="close" onClick={onClose} />
          </div>
        </div>

        <div style={{ padding: "32px 32px 60px" }}>
          <div style={{ display: "flex", alignItems: "baseline", gap: 16, marginBottom: 8 }}>
            <div className="serif" style={{ fontSize: 18, color: "var(--ink-3)" }}>
              {TYPE_GLYPHS[item.type]} {item.type}
            </div>
            {item.status === "consumed" && (
              <Pill tone="terra">Consumed · {fmt.daysAgo(item.consumedDate, getStoredTimezone())}</Pill>
            )}
            {item.status === "gone" && (
              <Pill tone="amber">Gone · {fmt.daysAgo(item.goneDate, getStoredTimezone())}</Pill>
            )}
            {isCheckedOut && (
              <Pill tone="outline">Checked out · {fmt.daysAgo(item.checkoutDate, getStoredTimezone())}</Pill>
            )}
            {isActive && overdue && <Pill tone="amber">Audit overdue · {sinceCheck}d</Pill>}
          </div>
          <h1
            className="serif"
            style={{
              fontSize: 48,
              margin: "0 0 4px",
              fontWeight: 500,
              letterSpacing: "-0.02em",
              lineHeight: 1.1,
            }}
          >
            {item.name}
          </h1>
          <div style={{ fontSize: 16, color: "var(--ink-2)" }}>
            {helpers.brandName(data, item.brandId)} · from {helpers.shopName(data, item.shopId)}
          </div>
          {siblings.length > 0 && (
            <div style={{ marginTop: 8, fontSize: 12, color: "var(--ink-3)" }}>
              {siblings.length} other instance{siblings.length === 1 ? "" : "s"} on file
            </div>
          )}

          {(() => {
            const statCards: [string, React.ReactNode][] = [
              ["Price", fmt.money(item.price)],
              [
                item.kind === "discrete" ? "Unit weight" : "Size",
                item.kind === "discrete"
                  ? `${item.unitWeight} ${cfg?.weightUnit ?? "g"}`
                  : `${item.weight} ${cfg?.unit ?? "g"}`,
              ],
              ...(cfg?.showCannabinoidPct !== false
                ? [
                    ["THC", `${item.thc.toFixed(1)}%`] as [string, React.ReactNode],
                    ["CBD", `${item.cbd.toFixed(1)}%`] as [string, React.ReactNode],
                  ]
                : []),
            ];
            return (
              <div
                style={{
                  display: "grid",
                  gridTemplateColumns: `repeat(${statCards.length}, 1fr)`,
                  gap: 1,
                  marginTop: 32,
                  background: "var(--line)",
                  border: "1px solid var(--line)",
                  borderRadius: "var(--r-md)",
                  overflow: "hidden",
                }}
              >
                {statCards.map(([l, v], i) => (
                  <div key={i} style={{ padding: "18px 16px", background: "var(--surface)" }}>
                    <div className="smallcaps" style={{ color: "var(--ink-3)" }}>{l}</div>
                    <div className="serif" style={{ fontSize: 26, marginTop: 4, fontWeight: 500 }}>{v}</div>
                  </div>
                ))}
              </div>
            );
          })()}

          {(isActive || isCheckedOut) && (
            <div style={{ marginTop: 20 }}>
              <div
                style={{
                  display: "flex",
                  justifyContent: "space-between",
                  alignItems: "baseline",
                  marginBottom: 8,
                }}
              >
                <div className="smallcaps" style={{ color: "var(--ink-3)" }}>
                  {item.kind === "discrete" ? "Units remaining" : "Estimated remaining"}
                </div>
                <div style={{ fontFamily: "var(--mono)", fontSize: 13 }}>
                  {item.kind === "discrete"
                    ? `${item.countLastAudit ?? item.countOriginal} of ${item.countOriginal}`
                    : `${est.toFixed(2)} of ${item.weight} ${cfg?.unit ?? "g"}`}
                  <span style={{ color: "var(--ink-3)", marginLeft: 8 }}>
                    {Math.round(pctRemaining * 100)}%
                  </span>
                </div>
              </div>
              <div style={{ height: 8, background: "var(--bg-3)", borderRadius: 4, overflow: "hidden" }}>
                <div
                  style={{
                    width: `${pctRemaining * 100}%`,
                    height: "100%",
                    background:
                      pctRemaining < 0.25
                        ? "var(--terracotta)"
                        : pctRemaining < 0.5
                          ? "var(--amber)"
                          : "var(--sage)",
                  }}
                />
              </div>
              {item.kind === "bulk" && last && (
                <div
                  style={{
                    fontSize: 11,
                    color: "var(--ink-3)",
                    marginTop: 6,
                    fontStyle: "italic",
                  }}
                >
                  Estimated by linear decay since last {last.mode} on {fmt.dateShort(last.date, getStoredTimezone())} ({last.value.toFixed(2)}
                  {cfg?.unit}). Re-audit to update.
                </div>
              )}
              {item.containerWeight != null && last && (
                <div
                  style={{
                    fontSize: 11,
                    color: "var(--ink-3)",
                    marginTop: 6,
                    fontStyle: "italic",
                  }}
                >
                  Expected container total: {((item.containerWeight - item.weight) + est).toFixed(2)}g
                </div>
              )}
            </div>
          )}

          <div style={{ marginTop: 36 }}>
            <div
              style={{
                display: "flex",
                justifyContent: "space-between",
                alignItems: "baseline",
                marginBottom: 12,
              }}
            >
              <div className="smallcaps" style={{ color: "var(--ink-3)" }}>Audit history</div>
              {isActive && (
                <button
                  onClick={() => onAudit(item)}
                  style={{
                    background: "none",
                    border: "none",
                    fontSize: 12,
                    color: "var(--ink-2)",
                    cursor: "pointer",
                    textDecoration: "underline",
                  }}
                >
                  + New audit
                </button>
              )}
            </div>
            {item.audits.length === 0 ? (
              <div style={{ fontSize: 13, color: "var(--ink-3)", fontStyle: "italic", padding: "12px 0" }}>
                No audits recorded. Cadence for {item.type}: every {cfg?.cadenceDays ?? "—"} days.
              </div>
            ) : (
              <div
                style={{
                  display: "flex",
                  flexDirection: "column",
                  gap: 0,
                  border: "1px solid var(--line)",
                  borderRadius: "var(--r-md)",
                  overflow: "hidden",
                }}
              >
                {[...item.audits].reverse().map((a, idx, arr) => (
                  <div
                    key={idx}
                    style={{
                      padding: "12px 16px",
                      borderBottom: idx < arr.length - 1 ? "1px solid var(--line)" : "none",
                      display: "flex",
                      alignItems: "center",
                      gap: 12,
                      background: "var(--surface)",
                    }}
                  >
                    <div
                      style={{
                        width: 8,
                        height: 8,
                        borderRadius: "50%",
                        background:
                          a.mode === "weigh"
                            ? "var(--sage)"
                            : a.mode === "estimate"
                              ? "var(--amber)"
                              : "var(--plum)",
                      }}
                    />
                    <div style={{ flex: 1 }}>
                      <div style={{ fontSize: 13, fontWeight: 500 }}>
                        {a.mode === "weigh" && "Weighed"}
                        {a.mode === "estimate" && "Estimated"}
                        {a.mode === "presence" && (a.confirmedBy === "lost" ? "Marked lost" : "Confirmed presence")}
                      </div>
                      <div style={{ fontSize: 11, color: "var(--ink-3)" }}>
                        {fmt.date(a.date, getStoredTimezone())} · {fmt.daysAgo(a.date, getStoredTimezone())}
                      </div>
                    </div>
                    <div className="mono" style={{ fontSize: 13, textAlign: "right" }}>
                      <div>
                        {item.kind === "discrete" ? a.value : a.value.toFixed(2)} {cfg?.unit}
                      </div>
                      <div style={{ fontSize: 10, color: "var(--ink-3)" }}>
                        was {a.prev != null ? (item.kind === "discrete" ? a.prev : a.prev.toFixed(2)) : "—"} {cfg?.unit}
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>

          <div style={{ marginTop: 36 }}>
            <div className="smallcaps" style={{ color: "var(--ink-3)", marginBottom: 12 }}>Details</div>
            <div style={{ display: "grid", gridTemplateColumns: "1fr 1fr", gap: "14px 32px" }}>
              {detailRows.map(([l, v], i) => (
                <div
                  key={i}
                  style={{
                    display: "flex",
                    justifyContent: "space-between",
                    paddingBottom: 12,
                    borderBottom: "1px solid var(--line)",
                  }}
                >
                  <span style={{ color: "var(--ink-3)", fontSize: 12 }}>{l}</span>
                  <span style={{ fontSize: 13, fontWeight: 500, textAlign: "right" }}>{v}</span>
                </div>
              ))}
            </div>
          </div>

          {(item.status === "consumed" || item.status === "gone") && (
            <div
              style={{
                marginTop: 36,
                padding: 24,
                background: "var(--bg-2)",
                border: "1px solid var(--line)",
                borderRadius: "var(--r-md)",
              }}
            >
              <div
                style={{
                  display: "flex",
                  alignItems: "baseline",
                  justifyContent: "space-between",
                  marginBottom: 12,
                }}
              >
                <div className="smallcaps" style={{ color: "var(--ink-3)" }}>
                  {item.status === "gone" ? "Why it's gone" : "Final notes"}
                </div>
                {item.status === "consumed" && (
                  <div style={{ display: "flex", gap: 2 }}>
                    {[1, 2, 3, 4, 5].map((n) => (
                      <Icon
                        key={n}
                        name="star"
                        size={14}
                        color={n <= (item.rating ?? 0) ? "var(--amber)" : "var(--ink-4)"}
                      />
                    ))}
                  </div>
                )}
              </div>
              <div
                className="serif"
                style={{ fontSize: 18, lineHeight: 1.5, color: "var(--ink-2)", fontStyle: "italic" }}
              >
                "{item.notes ?? "No notes recorded."}"
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}