import { useEffect, useState } from "react";

/* Icons the main app does not already provide, drawn to match its stroke style. */
const strokeProps = {
  width: 15,
  height: 15,
  viewBox: "0 0 24 24",
  fill: "none",
  stroke: "currentColor",
  strokeWidth: 2,
  strokeLinecap: "round",
  strokeLinejoin: "round",
};

const TableIcon = () => (
  <svg {...strokeProps}>
    <rect x="3" y="3" width="18" height="18" rx="2" />
    <line x1="3" y1="9" x2="21" y2="9" />
    <line x1="3" y1="15" x2="21" y2="15" />
    <line x1="9" y1="3" x2="9" y2="21" />
  </svg>
);
const LinkIcon = () => (
  <svg {...strokeProps}>
    <path d="M10 13a5 5 0 0 0 7.5.5l3-3a5 5 0 0 0-7-7l-1.7 1.7" />
    <path d="M14 11a5 5 0 0 0-7.5-.5l-3 3a5 5 0 0 0 7 7l1.7-1.7" />
  </svg>
);
const QuoteIcon = () => (
  <svg {...strokeProps}>
    <path d="M6 17h3l2-4V7H5v6h3z" />
    <path d="M16 17h3l2-4V7h-6v6h3z" />
  </svg>
);
const CodeIcon = () => (
  <svg {...strokeProps}>
    <polyline points="16 18 22 12 16 6" />
    <polyline points="8 6 2 12 8 18" />
  </svg>
);
const AtIcon = () => (
  <svg {...strokeProps}>
    <circle cx="12" cy="12" r="4" />
    <path d="M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-3.9 7.9" />
  </svg>
);

/**
 * Formatting controls for the note body.
 *
 * Reads its active states straight off the editor, so the buttons reflect the
 * cursor even when formatting changed by keyboard shortcut.
 */
export function EditorToolbar({ editor, T, icons, compact }) {
  const [, force] = useState(0);
  const [showTable, setShowTable] = useState(false);

  // ProseMirror state changes do not go through React; subscribe so the active
  // states stay in sync with the cursor.
  useEffect(() => {
    if (!editor) return;
    const rerender = () => force((n) => n + 1);
    editor.on("transaction", rerender);
    editor.on("selectionUpdate", rerender);
    return () => {
      editor.off("transaction", rerender);
      editor.off("selectionUpdate", rerender);
    };
  }, [editor]);

  useEffect(() => {
    if (!showTable) return;
    const close = (e) => {
      if (!e.target.closest?.("[data-table-menu]")) setShowTable(false);
    };
    document.addEventListener("pointerdown", close);
    return () => document.removeEventListener("pointerdown", close);
  }, [showTable]);

  if (!editor) return null;

  const btn = (active) => ({
    display: "flex",
    alignItems: "center",
    justifyContent: "center",
    width: 30,
    height: 30,
    borderRadius: 6,
    border: "none",
    cursor: "pointer",
    background: active ? T.active + "22" : "transparent",
    color: active ? T.active : T.text,
    transition: "all .12s",
    flexShrink: 0,
  });
  const divider = (
    <div style={{ width: 1, height: 22, background: T.border, margin: "0 2px", flexShrink: 0 }} />
  );
  const inTable = editor.isActive("table");

  const menuItem = {
    display: "block",
    width: "100%",
    padding: "6px 10px",
    border: "none",
    borderRadius: 6,
    background: "transparent",
    color: T.text,
    fontSize: 12,
    textAlign: "left",
    cursor: "pointer",
  };

  const promptLink = () => {
    const previous = editor.getAttributes("link").href || "";
    const url = window.prompt("Link URL (leave empty to remove)", previous);
    if (url === null) return;
    if (url === "") {
      editor.chain().focus().extendMarkRange("link").unsetLink().run();
      return;
    }
    if (!/^(https?|mailto):/i.test(url)) {
      window.alert("Only http(s) and mailto links are allowed.");
      return;
    }
    editor.chain().focus().extendMarkRange("link").setLink({ href: url }).run();
  };

  return (
    <>
      <button
        style={btn(editor.isActive("bold"))}
        title="Bold (Ctrl+B)"
        onClick={() => editor.chain().focus().toggleBold().run()}
      >
        {icons.bold}
      </button>
      <button
        style={btn(editor.isActive("italic"))}
        title="Italic (Ctrl+I)"
        onClick={() => editor.chain().focus().toggleItalic().run()}
      >
        {icons.italic}
      </button>
      <button
        style={btn(editor.isActive("underline"))}
        title="Underline (Ctrl+U)"
        onClick={() => editor.chain().focus().toggleUnderline().run()}
      >
        {icons.underline}
      </button>
      {divider}
      <button
        style={btn(editor.isActive("bulletList"))}
        title="Bullet list"
        onClick={() => editor.chain().focus().toggleBulletList().run()}
      >
        {icons.list}
      </button>
      <button
        style={btn(editor.isActive("orderedList"))}
        title="Numbered list"
        onClick={() => editor.chain().focus().toggleOrderedList().run()}
      >
        {icons.listOrd}
      </button>
      <button
        style={btn(editor.isActive("taskList"))}
        title="Task list"
        onClick={() => editor.chain().focus().toggleTaskList().run()}
      >
        {icons.check}
      </button>
      {divider}

      {/* Tables */}
      <div style={{ position: "relative" }} data-table-menu>
        <button style={btn(inTable || showTable)} title="Table" onClick={() => setShowTable((v) => !v)}>
          <TableIcon />
        </button>
        {showTable && (
          <div
            style={{
              position: "absolute",
              top: 36,
              left: 0,
              minWidth: 190,
              background: T.toolbar,
              border: `1px solid ${T.border}`,
              borderRadius: 12,
              padding: 6,
              zIndex: 200,
              boxShadow: "0 8px 20px rgba(0,0,0,.2)",
            }}
          >
            <button
              style={menuItem}
              onClick={() => {
                editor.chain().focus().insertTable({ rows: 3, cols: 3, withHeaderRow: true }).run();
                setShowTable(false);
              }}
            >
              Insert 3 × 3 table
            </button>
            {inTable && (
              <>
                <div style={{ height: 1, background: T.border, margin: "5px 2px" }} />
                <button style={menuItem} onClick={() => editor.chain().focus().addColumnBefore().run()}>
                  Add column left
                </button>
                <button style={menuItem} onClick={() => editor.chain().focus().addColumnAfter().run()}>
                  Add column right
                </button>
                <button style={menuItem} onClick={() => editor.chain().focus().addRowBefore().run()}>
                  Add row above
                </button>
                <button style={menuItem} onClick={() => editor.chain().focus().addRowAfter().run()}>
                  Add row below
                </button>
                <div style={{ height: 1, background: T.border, margin: "5px 2px" }} />
                <button style={menuItem} onClick={() => editor.chain().focus().toggleHeaderRow().run()}>
                  Toggle header row
                </button>
                <button style={menuItem} onClick={() => editor.chain().focus().mergeOrSplit().run()}>
                  Merge / split cells
                </button>
                <div style={{ height: 1, background: T.border, margin: "5px 2px" }} />
                <button
                  style={{ ...menuItem, color: T.danger || "#e5534b" }}
                  onClick={() => editor.chain().focus().deleteColumn().run()}
                >
                  Delete column
                </button>
                <button
                  style={{ ...menuItem, color: T.danger || "#e5534b" }}
                  onClick={() => editor.chain().focus().deleteRow().run()}
                >
                  Delete row
                </button>
                <button
                  style={{ ...menuItem, color: T.danger || "#e5534b" }}
                  onClick={() => {
                    editor.chain().focus().deleteTable().run();
                    setShowTable(false);
                  }}
                >
                  Delete table
                </button>
              </>
            )}
          </div>
        )}
      </div>

      <button
        style={btn(false)}
        title="Link to another note (or type @)"
        onClick={() => editor.chain().focus().insertContent("@").run()}
      >
        <AtIcon />
      </button>
      <button style={btn(editor.isActive("link"))} title="Web link" onClick={promptLink}>
        <LinkIcon />
      </button>

      {!compact && (
        <>
          {divider}
          <button
            style={btn(editor.isActive("blockquote"))}
            title="Quote"
            onClick={() => editor.chain().focus().toggleBlockquote().run()}
          >
            <QuoteIcon />
          </button>
          <button
            style={btn(editor.isActive("codeBlock"))}
            title="Code block"
            onClick={() => editor.chain().focus().toggleCodeBlock().run()}
          >
            <CodeIcon />
          </button>
        </>
      )}

      {divider}
      <select
        value={
          editor.isActive("heading", { level: 1 })
            ? "h1"
            : editor.isActive("heading", { level: 2 })
              ? "h2"
              : editor.isActive("heading", { level: 3 })
                ? "h3"
                : "p"
        }
        onChange={(e) => {
          const v = e.target.value;
          if (v === "p") editor.chain().focus().setParagraph().run();
          else
            editor
              .chain()
              .focus()
              .toggleHeading({ level: Number(v[1]) })
              .run();
        }}
        style={{
          border: `1px solid ${T.border}`,
          borderRadius: 6,
          padding: "3px 6px",
          background: T.toolbar,
          color: T.text,
          fontSize: 11,
          cursor: "pointer",
        }}
      >
        <option value="p">Body</option>
        <option value="h1">H1</option>
        <option value="h2">H2</option>
        <option value="h3">H3</option>
      </select>

      {divider}
      <button
        style={{ ...btn(false), opacity: editor.can().undo() ? 1 : 0.35 }}
        title="Undo"
        onClick={() => editor.chain().focus().undo().run()}
      >
        {icons.undo}
      </button>
      <button
        style={{ ...btn(false), opacity: editor.can().redo() ? 1 : 0.35 }}
        title="Redo"
        onClick={() => editor.chain().focus().redo().run()}
      >
        {icons.redo}
      </button>
    </>
  );
}

export default EditorToolbar;