package com.peachpasswords.ui.theme

import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.darkColorScheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.Density
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.sp

/** Current accent color, available to any composable under [PeachTheme]. */
val LocalPeachAccent = compositionLocalOf { DEFAULT_ACCENT }

/** When true, decorative/long-running animations should be skipped or shortened. */
val LocalReduceMotion = staticCompositionLocalOf { false }

@Composable
fun PeachTheme(
    accent: Color = DEFAULT_ACCENT,
    reduceMotion: Boolean = false,
    textSize: String = "medium",
    content: @Composable () -> Unit,
) {
    // V3 text size (browser's data-text-size parity): scale the ambient font
    // scale. small=0.92 matches the extension's intent (its CSS ships no small
    // rule); large=1.08 matches the extension's zoom exactly. Only ROOT themes
    // should pass a non-default textSize — nested PeachTheme calls keep the
    // 1.0 factor so the scale is applied exactly once.
    val textScale = when (textSize) {
        "small" -> 0.92f
        "large" -> 1.08f
        else -> 1f
    }
    val baseDensity = LocalDensity.current
    val scaledDensity = if (textScale == 1f) {
        baseDensity
    } else {
        Density(baseDensity.density, baseDensity.fontScale * textScale)
    }
    val colors = darkColorScheme(
        primary = accent,
        onPrimary = PeachColors.Bg,
        secondary = PeachColors.SyncBusy,
        onSecondary = PeachColors.Bg,
        background = PeachColors.Bg,
        onBackground = PeachColors.T0,
        surface = PeachColors.S1,
        onSurface = PeachColors.T0,
        surfaceVariant = PeachColors.S2,
        onSurfaceVariant = PeachColors.T1,
        outline = PeachColors.T3,
        error = PeachColors.Breach,
        onError = PeachColors.Bg,
    )

    val typography = androidx.compose.material3.Typography(
        bodyLarge = TextStyle(
            fontFamily = PeachType.Body,
            fontSize = 16.sp,
            fontWeight = FontWeight.Normal,
        ),
        titleLarge = TextStyle(
            fontFamily = PeachType.Display,
            fontSize = 24.sp,
            fontStyle = FontStyle.Italic,
            fontWeight = FontWeight.Light,
        ),
        labelLarge = TextStyle(
            fontFamily = PeachType.Body,
            fontSize = 12.sp,
            fontWeight = FontWeight.Medium,
        ),
    )

    CompositionLocalProvider(
        LocalDensity provides scaledDensity,
        LocalPeachAccent provides accent,
        LocalReduceMotion provides reduceMotion,
        LocalPeachColors provides peachDark(accent),
    ) {
        MaterialTheme(colorScheme = colors, typography = typography, content = content)
    }
}