// Dashboard-matching theme + highlight style for CodeMirror.
//
// Colors are pulled from the existing slate/sky palette used across
// the dashboard (#0f172a / #1e293b / #38bdf8) so the editor blends
// into the surrounding cards instead of looking like a third-party
// transplant. Stock dark themes like "One Dark" or "VS Code Dark"
// would each clash with the slate background by a few shades.

import { EditorView } from '@codemirror/view';
import { HighlightStyle, syntaxHighlighting } from '@codemirror/language';
import { tags as t } from '@lezer/highlight';

const palette = {
	bg: '#0b1220', // matches existing <input>/<textarea> backgrounds
	bgGutter: '#0f172a',
	border: '#334155',
	text: '#e2e8f0',
	textMuted: '#94a3b8',
	cursor: '#38bdf8',
	// Selection alpha was originally 30 (≈19%) — bumped to 55 (≈33%)
	// so it stays clearly visible when it sits on top of (or under, in
	// CodeMirror's case) the active-line tint. The default CM layering
	// puts the selection layer behind line backgrounds, so an opaque
	// active line hides selections on the current line; this pair of
	// values makes both visible at once.
	selection: '#38bdf855',
	// Active line: very subtle sky tint at ~6% alpha. Strong enough to
	// see at a glance which line the caret is on, weak enough to leave
	// the selection visible underneath. The active-line gutter (the
	// brighter line number on the left) is the primary indicator.
	activeLine: '#38bdf810',
	activeLineGutter: '#1e293b',
	matchingBracket: '#38bdf850',
	searchMatch: '#38bdf850',
	searchMatchSelected: '#38bdf8',

	// Syntax — chosen to be readable against #0b1220 without making
	// any single token feel louder than the rest.
	comment: '#64748b',
	str: '#86efac',
	num: '#fbbf24',
	bool: '#fbbf24',
	keyword: '#c4b5fd',
	control: '#c4b5fd',
	operator: '#cbd5e1',
	punct: '#cbd5e1',
	function: '#38bdf8',
	property: '#e2e8f0',
	variable: '#e2e8f0',
	ctx: '#f472b6', // `ctx` is special — pinker so users notice it
	namespace: '#fbbf24', // `log::`
	invalid: '#ef4444'
};

export const dashboardTheme = EditorView.theme(
	{
		'&': {
			color: palette.text,
			backgroundColor: palette.bg,
			borderRadius: '0.375rem'
		},
		'&.cm-focused': {
			outline: `1px solid ${palette.cursor}`
		},
		'.cm-content': {
			caretColor: palette.cursor,
			fontFamily:
				'ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace',
			fontSize: '0.85rem',
			padding: '0.5rem 0'
		},
		'.cm-cursor, .cm-dropCursor': {
			borderLeftColor: palette.cursor,
			borderLeftWidth: '2px'
		},
		'&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection':
			{
				backgroundColor: palette.selection
			},
		'.cm-activeLine': {
			backgroundColor: palette.activeLine
		},
		'.cm-gutters': {
			backgroundColor: palette.bgGutter,
			color: palette.textMuted,
			border: 'none',
			borderRight: `1px solid ${palette.border}`
		},
		'.cm-activeLineGutter': {
			backgroundColor: palette.activeLineGutter,
			color: palette.text
		},
		'.cm-matchingBracket, .cm-nonmatchingBracket': {
			backgroundColor: palette.matchingBracket,
			outline: 'none'
		},
		// Search / replace panel (Ctrl+F)
		'.cm-panels': {
			backgroundColor: palette.bgGutter,
			color: palette.text,
			borderTop: `1px solid ${palette.border}`
		},
		'.cm-searchMatch': {
			backgroundColor: palette.searchMatch
		},
		'.cm-searchMatch.cm-searchMatch-selected': {
			backgroundColor: palette.searchMatchSelected
		},
		'.cm-panel input, .cm-panel button': {
			backgroundColor: palette.bg,
			color: palette.text,
			border: `1px solid ${palette.border}`,
			borderRadius: '0.25rem',
			padding: '0.2rem 0.4rem'
		},
		'.cm-panel button:hover': {
			backgroundColor: palette.activeLine
		},
		// Autocomplete popup
		'.cm-tooltip': {
			backgroundColor: palette.bgGutter,
			border: `1px solid ${palette.border}`,
			color: palette.text
		},
		'.cm-tooltip.cm-tooltip-autocomplete > ul > li[aria-selected]': {
			backgroundColor: palette.activeLine,
			color: palette.text
		},
		'.cm-completionLabel': {
			color: palette.text
		},
		'.cm-completionDetail': {
			color: palette.textMuted,
			fontStyle: 'normal'
		},
		'.cm-completionIcon': {
			color: palette.textMuted
		}
	},
	{ dark: true }
);

export const dashboardHighlight = HighlightStyle.define([
	{ tag: t.comment, color: palette.comment, fontStyle: 'italic' },
	{ tag: [t.string, t.special(t.string)], color: palette.str },
	{ tag: [t.number, t.bool, t.null], color: palette.num },
	{ tag: [t.keyword, t.modifier], color: palette.keyword, fontWeight: '600' },
	{ tag: t.controlKeyword, color: palette.control, fontWeight: '600' },
	{ tag: [t.operator, t.derefOperator, t.logicOperator], color: palette.operator },
	{ tag: [t.punctuation, t.bracket, t.brace, t.paren, t.squareBracket], color: palette.punct },
	{ tag: [t.function(t.variableName), t.function(t.propertyName)], color: palette.function },
	{ tag: [t.propertyName, t.attributeName], color: palette.property },
	{ tag: t.variableName, color: palette.variable },
	{ tag: t.special(t.variableName), color: palette.ctx, fontWeight: '600' },
	{ tag: t.namespace, color: palette.namespace, fontWeight: '600' },
	{ tag: t.invalid, color: palette.invalid, textDecoration: 'underline wavy' }
]);

export const dashboardSyntaxHighlighting = syntaxHighlighting(dashboardHighlight);