import { onMount } from "solid-js";

export function toHtml(raw: string): string {
  if (/<\/?[a-z]/i.test(raw)) return raw;
  return raw
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/\n/g, "<br>");
}

const BoldIcon = () => <span style="font-family:Inter,system-ui,sans-serif;font-weight:700;font-size:11px;">B</span>;
const ItalicIcon = () => <span style="font-family:'Cormorant Garamond',serif;font-style:italic;font-size:13px;">I</span>;
const UnderlineIcon = () => <span style="text-decoration:underline;font-size:10px;font-family:'IBM Plex Mono',monospace;">U</span>;
const StrikeIcon = () => <span style="text-decoration:line-through;font-size:10px;font-family:'IBM Plex Mono',monospace;">S</span>;
const HeadingIcon = () => <span style="font-family:Inter,system-ui,sans-serif;font-weight:600;font-size:10px;letter-spacing:0.03em;">H</span>;

const BulletIcon = () => (
  <svg width="12" height="11" viewBox="0 0 12 11" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round">
    <circle cx="1.5" cy="2.5" r="1" fill="currentColor" stroke="none"/>
    <line x1="4" y1="2.5" x2="11" y2="2.5"/>
    <circle cx="1.5" cy="6" r="1" fill="currentColor" stroke="none"/>
    <line x1="4" y1="6" x2="11" y2="6"/>
    <circle cx="1.5" cy="9.5" r="1" fill="currentColor" stroke="none"/>
    <line x1="4" y1="9.5" x2="11" y2="9.5"/>
  </svg>
);

const NumberedIcon = () => (
  <svg width="12" height="11" viewBox="0 0 12 11" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round">
    <text x="0" y="4" font-size="4" fill="currentColor" stroke="none" font-family="monospace">1.</text>
    <line x1="4" y1="2.5" x2="11" y2="2.5"/>
    <text x="0" y="7.5" font-size="4" fill="currentColor" stroke="none" font-family="monospace">2.</text>
    <line x1="4" y1="6" x2="11" y2="6"/>
    <text x="0" y="11" font-size="4" fill="currentColor" stroke="none" font-family="monospace">3.</text>
    <line x1="4" y1="9.5" x2="11" y2="9.5"/>
  </svg>
);

const RuleIcon = () => (
  <svg width="12" height="8" viewBox="0 0 12 8" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round">
    <line x1="0" y1="4" x2="12" y2="4"/>
    <line x1="2" y1="1.5" x2="2" y2="6.5" stroke-width="0.6" opacity="0.5"/>
    <line x1="10" y1="1.5" x2="10" y2="6.5" stroke-width="0.6" opacity="0.5"/>
  </svg>
);

type ExecFn = (cmd: string, val?: string) => void;

function Toolbar(props: { exec: ExecFn }) {
  const e = props.exec;
  function toggleHeading() {
    const val = document.queryCommandValue("formatBlock").toLowerCase();
    e("formatBlock", val === "h2" ? "p" : "h2");
  }
  return (
    <div class="peach-note-toolbar">
      <button class="peach-note-tool-btn" onMouseDown={(ev) => { ev.preventDefault(); e("bold"); }} title="Bold (⌘B)"><BoldIcon /></button>
      <button class="peach-note-tool-btn" onMouseDown={(ev) => { ev.preventDefault(); e("italic"); }} title="Italic (⌘I)"><ItalicIcon /></button>
      <button class="peach-note-tool-btn" onMouseDown={(ev) => { ev.preventDefault(); e("underline"); }} title="Underline (⌘U)"><UnderlineIcon /></button>
      <button class="peach-note-tool-btn" onMouseDown={(ev) => { ev.preventDefault(); e("strikeThrough"); }} title="Strikethrough"><StrikeIcon /></button>
      <div class="peach-note-tool-divider" />
      <button class="peach-note-tool-btn" onMouseDown={(ev) => { ev.preventDefault(); toggleHeading(); }} title="Heading"><HeadingIcon /></button>
      <button class="peach-note-tool-btn peach-note-tool-icon" onMouseDown={(ev) => { ev.preventDefault(); e("insertUnorderedList"); }} title="Bullet list"><BulletIcon /></button>
      <button class="peach-note-tool-btn peach-note-tool-icon" onMouseDown={(ev) => { ev.preventDefault(); e("insertOrderedList"); }} title="Numbered list"><NumberedIcon /></button>
      <div class="peach-note-tool-divider" />
      <button class="peach-note-tool-btn peach-note-tool-icon" onMouseDown={(ev) => { ev.preventDefault(); e("insertHorizontalRule"); }} title="Divider"><RuleIcon /></button>
    </div>
  );
}

/* ── Full-popup overlay editor (Entry.tsx) ── */

interface NoteEditorProps {
  initialContent: string;
  saving: boolean;
  onSave: (html: string) => Promise<void>;
  onCancel: () => void;
}

export function NoteEditor(props: NoteEditorProps) {
  let editorRef: HTMLDivElement | undefined;

  onMount(() => {
    if (!editorRef) return;
    editorRef.innerHTML = toHtml(props.initialContent);
    editorRef.focus();
    const sel = window.getSelection();
    if (sel) {
      const range = document.createRange();
      range.selectNodeContents(editorRef);
      range.collapse(false);
      sel.removeAllRanges();
      sel.addRange(range);
    }
  });

  function exec(cmd: string, value?: string) {
    document.execCommand(cmd, false, value);
    editorRef?.focus();
  }

  function handleKeyDown(e: KeyboardEvent) {
    const mod = e.metaKey || e.ctrlKey;
    if (mod && e.key === "b") { e.preventDefault(); exec("bold"); return; }
    if (mod && e.key === "i") { e.preventDefault(); exec("italic"); return; }
    if (mod && e.key === "u") { e.preventDefault(); exec("underline"); return; }
    if (e.key === "Escape") { e.preventDefault(); props.onCancel(); }
  }

  return (
    <div class="peach-note-editor">
      <div class="peach-note-editor-header">
        <button class="peach-note-editor-back" onClick={props.onCancel}
          disabled={props.saving} aria-label="Cancel">
          <svg width="7" height="12" viewBox="0 0 7 12" fill="none" stroke="currentColor"
            stroke-width="1.1" stroke-linecap="round" stroke-linejoin="round">
            <path d="M6 1L1 6L6 11" />
          </svg>
        </button>
        <span class="peach-note-editor-label">note</span>
        <button class="peach-note-editor-save-btn"
          onClick={() => void props.onSave(editorRef?.innerHTML ?? "")}
          disabled={props.saving}>
          {props.saving ? "saving…" : "save"}
        </button>
      </div>
      <Toolbar exec={exec} />
      <div ref={editorRef} class="peach-note-editor-body"
        contenteditable="true" onKeyDown={handleKeyDown}
        aria-multiline="true" aria-label="Note content" />
    </div>
  );
}

/* ── Inline editor (Add.tsx) ── */

interface NoteEditorInlineProps {
  initialContent: string;
  onContentChange: (html: string) => void;
}

export function NoteEditorInline(props: NoteEditorInlineProps) {
  let editorRef: HTMLDivElement | undefined;

  onMount(() => {
    if (!editorRef) return;
    editorRef.innerHTML = toHtml(props.initialContent);
    editorRef.focus();
  });

  function exec(cmd: string, value?: string) {
    document.execCommand(cmd, false, value);
    editorRef?.focus();
  }

  function handleKeyDown(e: KeyboardEvent) {
    const mod = e.metaKey || e.ctrlKey;
    if (mod && e.key === "b") { e.preventDefault(); exec("bold"); }
    if (mod && e.key === "i") { e.preventDefault(); exec("italic"); }
    if (mod && e.key === "u") { e.preventDefault(); exec("underline"); }
  }

  return (
    <div class="peach-note-editor-inline">
      <Toolbar exec={exec} />
      <div ref={editorRef}
        class="peach-note-editor-body peach-note-editor-body--inline"
        contenteditable="true"
        onKeyDown={handleKeyDown}
        onInput={() => props.onContentChange(editorRef?.innerHTML ?? "")}
        aria-multiline="true"
        aria-label="Note content"
      />
    </div>
  );
}