// CodeMirror 6 bundle entry point.
//
// Imports only the CM packages the editor needs (keep the bundle small for the
// mobile/VPN path) and exposes them on window.CM for the global-style editor
// scripts. The editor theme and markdown highlight palette draw from the app's
// :root CSS variables so there are no hardcoded colors/spacing here.
import { EditorState, EditorSelection, Compartment, Prec } from "@codemirror/state";
import { EditorView, keymap, drawSelection } from "@codemirror/view";
import { history, historyKeymap, defaultKeymap, indentWithTab, undo, redo, deleteLine } from "@codemirror/commands";
import { markdown, markdownLanguage, markdownKeymap } from "@codemirror/lang-markdown";
import { syntaxHighlighting, HighlightStyle, indentOnInput, StreamLanguage } from "@codemirror/language";
import {
    autocompletion,
    closeBrackets,
    closeBracketsKeymap,
    completionKeymap,
    startCompletion,
} from "@codemirror/autocomplete";
import { tags } from "@lezer/highlight";

// Editor chrome. Colors/spacing/fonts come from :root variables; var() works
// here because HighlightStyle/theme emit real CSS rules.
const theme = EditorView.theme(
    {
        "&": {
            backgroundColor: "var(--bg)",
            color: "var(--text)",
            fontSize: "0.9rem",
            border: "var(--border)",
            borderTop: "none",
        },
        "&.cm-focused": { outline: "none" },
        ".cm-scroller": {
            fontFamily: '"Iosevka Slab", monospace',
            lineHeight: "1.6",
            minHeight: "60vh",
        },
        ".cm-content": {
            padding: "var(--space-4)",
            caretColor: "var(--text)",
        },
        ".cm-cursor, .cm-dropCursor": { borderLeftColor: "var(--text)" },
        "&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection":
            { backgroundColor: "var(--bg-panel-hover)" },
        ".cm-activeLine": { backgroundColor: "transparent" },
        ".cm-tooltip": {
            backgroundColor: "var(--bg-panel)",
            border: "var(--border-dashed)",
            color: "var(--text)",
        },
        ".cm-tooltip.cm-tooltip-autocomplete > ul": {
            fontFamily: '"Iosevka Slab", monospace',
            fontSize: "var(--font-sm)",
        },
        ".cm-tooltip-autocomplete ul li[aria-selected]": {
            backgroundColor: "var(--bg-panel-hover)",
            color: "var(--text)",
        },
        ".cm-completionDetail": {
            color: "var(--text-muted)",
            fontStyle: "normal",
            marginLeft: "var(--space-3)",
        },
    },
    { dark: true }
);

const highlightStyle = HighlightStyle.define([
    { tag: [tags.heading1, tags.heading2, tags.heading3, tags.heading4, tags.heading5, tags.heading6], color: "var(--secondary)", fontWeight: "bold" },
    { tag: tags.strong, fontWeight: "bold", color: "var(--text)" },
    { tag: tags.emphasis, fontStyle: "italic" },
    { tag: tags.strikethrough, textDecoration: "line-through" },
    { tag: [tags.link, tags.url], color: "var(--link)" },
    { tag: tags.monospace, color: "var(--primary-hover)" },
    { tag: tags.quote, color: "var(--text-muted)", fontStyle: "italic" },
    { tag: [tags.list, tags.contentSeparator], color: "var(--secondary)" },
    { tag: [tags.processingInstruction, tags.meta], color: "var(--text-muted)" },
]);

// todo.txt language for the left-rail todo widget (assets/todo-rail.js).
// Line-oriented: `x ` done-prefix strikes the whole line; `(A)` priority,
// `+project`, `@context` and ISO dates get their own colors. No parsing into
// task objects — highlighting only.
const todoLanguage = StreamLanguage.define({
    token(stream) {
        if (stream.sol() && stream.match(/^x\s.*/)) return "todoDone";
        if (stream.sol() && stream.match(/^\([A-Z]\)(?=\s|$)/)) return "todoPriority";
        // +project / @context / dates only count at word starts (start of line
        // or after whitespace), per the todo.txt format.
        const atWordStart = stream.start === 0 || /\s/.test(stream.string.charAt(stream.start - 1));
        if (atWordStart) {
            if (stream.match(/^\d{4}-\d{2}-\d{2}(?=\s|$)/)) return "todoDate";
            if (stream.match(/^\+\S+/)) return "todoProject";
            if (stream.match(/^@\S+/)) return "todoContext";
        }
        // Consume whitespace OR one plain word — never both, or the word after
        // a space would be swallowed before it can be matched above.
        if (!stream.eatSpace()) {
            stream.next();
            stream.eatWhile(/\S/);
        }
        return null;
    },
    tokenTable: {
        todoDone: tags.strikethrough,
        todoPriority: tags.keyword,
        todoProject: tags.typeName,
        todoContext: tags.atom,
        todoDate: tags.meta,
    },
});

const todoHighlightStyle = HighlightStyle.define([
    { tag: tags.strikethrough, textDecoration: "line-through", color: "var(--text-muted)" },
    { tag: tags.keyword, color: "var(--secondary)", fontWeight: "bold" },
    { tag: tags.typeName, color: "var(--link)" },
    { tag: tags.atom, color: "var(--primary-hover)" },
    { tag: tags.meta, color: "var(--text-muted)" },
]);

// Minimal chrome for the rail editor — the full editor `theme` above forces a
// 60vh min-height and page-editor padding that don't fit a sidebar widget.
// Sizing/height caps live in style.css under .todo-rail.
const todoTheme = EditorView.theme(
    {
        "&": { backgroundColor: "transparent", color: "var(--text)", fontSize: "var(--font-xs)" },
        "&.cm-focused": { outline: "none" },
        ".cm-scroller": { fontFamily: '"Iosevka Slab", monospace', lineHeight: "1.5" },
        ".cm-content": { caretColor: "var(--text)" },
        ".cm-cursor, .cm-dropCursor": { borderLeftColor: "var(--text)" },
        "&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection":
            { backgroundColor: "var(--bg-panel-hover)" },
    },
    { dark: true }
);

window.CM = {
    EditorState,
    EditorSelection,
    Compartment,
    Prec,
    EditorView,
    keymap,
    drawSelection,
    history,
    historyKeymap,
    defaultKeymap,
    indentWithTab,
    undo,
    redo,
    deleteLine,
    markdown,
    markdownLanguage,
    markdownKeymap,
    syntaxHighlighting,
    indentOnInput,
    autocompletion,
    closeBrackets,
    closeBracketsKeymap,
    completionKeymap,
    startCompletion,
    theme,
    highlightStyle,
    todoLanguage,
    todoHighlightStyle,
    todoTheme,
};