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import {
createContext,
useContext,
createSignal,
onMount,
onCleanup,
createEffect,
type JSX,
type Accessor,
} from "solid-js"
import type { DesktopTheme } from "./types"
import { resolveThemeVariant, themeToCss } from "./resolve"
import { DEFAULT_THEMES } from "./default-themes"
export type ColorScheme = "light" | "dark" | "system"
interface ThemeContextValue {
themeId: Accessor<string>
colorScheme: Accessor<ColorScheme>
mode: Accessor<"light" | "dark">
themes: Accessor<Record<string, DesktopTheme>>
setTheme: (id: string) => void
setColorScheme: (scheme: ColorScheme) => void
registerTheme: (theme: DesktopTheme) => void
}
const ThemeContext = createContext<ThemeContextValue>()
const STORAGE_KEYS = {
THEME_ID: "opencode-theme-id",
COLOR_SCHEME: "opencode-color-scheme",
THEME_CSS_PREFIX: "opencode-theme-css",
} as const
function getThemeCacheKey(themeId: string, mode: "light" | "dark"): string {
return `${STORAGE_KEYS.THEME_CSS_PREFIX}-${themeId}-${mode}`
}
const THEME_STYLE_ID = "oc-theme"
function ensureThemeStyleElement(): HTMLStyleElement {
const existing = document.getElementById(THEME_STYLE_ID) as HTMLStyleElement | null
if (existing) {
return existing
}
const element = document.createElement("style")
element.id = THEME_STYLE_ID
document.head.appendChild(element)
return element
}
function getSystemMode(): "light" | "dark" {
return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light"
}
function applyThemeCss(theme: DesktopTheme, themeId: string, mode: "light" | "dark"): void {
const isDark = mode === "dark"
const variant = isDark ? theme.dark : theme.light
const tokens = resolveThemeVariant(variant, isDark)
const css = themeToCss(tokens)
if (themeId !== "oc-1") {
const cacheKey = getThemeCacheKey(themeId, mode)
try {
localStorage.setItem(cacheKey, css)
} catch {}
}
const fullCss = `:root {
color-scheme: ${mode};
--text-mix-blend-mode: ${isDark ? "plus-lighter" : "multiply"};
${css}
}`
const preloadStyle = document.getElementById("oc-theme-preload")
if (preloadStyle) {
preloadStyle.remove()
}
const themeStyleElement = ensureThemeStyleElement()
themeStyleElement.textContent = fullCss
document.documentElement.dataset.theme = themeId
document.documentElement.dataset.colorScheme = mode
}
function cacheThemeVariants(theme: DesktopTheme, themeId: string): void {
if (themeId === "oc-1") return
for (const mode of ["light", "dark"] as const) {
const isDark = mode === "dark"
const variant = isDark ? theme.dark : theme.light
const tokens = resolveThemeVariant(variant, isDark)
const css = themeToCss(tokens)
const cacheKey = getThemeCacheKey(themeId, mode)
try {
localStorage.setItem(cacheKey, css)
} catch {}
}
}
export function ThemeProvider(props: { children: JSX.Element; defaultTheme?: string }) {
const [themes, setThemes] = createSignal<Record<string, DesktopTheme>>(DEFAULT_THEMES)
const [themeId, setThemeIdSignal] = createSignal(props.defaultTheme ?? "oc-1")
const [colorScheme, setColorSchemeSignal] = createSignal<ColorScheme>("system")
const [mode, setMode] = createSignal<"light" | "dark">(getSystemMode())
onMount(() => {
const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)")
const handler = () => {
if (colorScheme() === "system") {
setMode(getSystemMode())
}
}
mediaQuery.addEventListener("change", handler)
onCleanup(() => mediaQuery.removeEventListener("change", handler))
const savedTheme = localStorage.getItem(STORAGE_KEYS.THEME_ID)
const savedScheme = localStorage.getItem(STORAGE_KEYS.COLOR_SCHEME) as ColorScheme | null
if (savedTheme && themes()[savedTheme]) {
setThemeIdSignal(savedTheme)
}
if (savedScheme) {
setColorSchemeSignal(savedScheme)
if (savedScheme !== "system") {
setMode(savedScheme)
}
}
const currentTheme = themes()[themeId()]
if (currentTheme) {
cacheThemeVariants(currentTheme, themeId())
}
})
createEffect(() => {
const id = themeId()
const m = mode()
const theme = themes()[id]
if (theme) {
applyThemeCss(theme, id, m)
}
})
const setTheme = (id: string) => {
const theme = themes()[id]
if (!theme) {
console.warn(`Theme "${id}" not found`)
return
}
setThemeIdSignal(id)
localStorage.setItem(STORAGE_KEYS.THEME_ID, id)
cacheThemeVariants(theme, id)
}
const setColorSchemePref = (scheme: ColorScheme) => {
setColorSchemeSignal(scheme)
localStorage.setItem(STORAGE_KEYS.COLOR_SCHEME, scheme)
if (scheme === "system") {
setMode(getSystemMode())
} else {
setMode(scheme)
}
}
const registerTheme = (theme: DesktopTheme) => {
setThemes((prev) => ({
...prev,
[theme.id]: theme,
}))
}
return (
<ThemeContext.Provider
value={{
themeId,
colorScheme,
mode,
themes,
setTheme,
setColorScheme: setColorSchemePref,
registerTheme,
}}
>
{props.children}
</ThemeContext.Provider>
)
}
export function useTheme(): ThemeContextValue {
const ctx = useContext(ThemeContext)
if (!ctx) {
throw new Error("useTheme must be used within a ThemeProvider")
}
return ctx
}
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