package com.example.ui.screens

import androidx.compose.animation.core.*
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Language
import androidx.compose.material.icons.filled.Security
import androidx.compose.material.icons.filled.Shield
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.scale
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.data.model.AppLanguage
import com.example.ui.theme.*

@Composable
fun SplashScreen(
    lang: AppLanguage,
    onToggleLang: () -> Unit,
    onContinue: () -> Unit,
    modifier: Modifier = Modifier
) {
    val infiniteTransition = rememberInfiniteTransition(label = "pulse")
    val pulseScale by infiniteTransition.animateFloat(
        initialValue = 0.96f,
        targetValue = 1.04f,
        animationSpec = infiniteRepeatable(
            animation = tween(1200, easing = FastOutSlowInEasing),
            repeatMode = RepeatMode.Reverse
        ),
        label = "shield_pulse"
    )

    Box(
        modifier = modifier
            .fillMaxSize()
            .background(
                Brush.verticalGradient(
                    colors = listOf(
                        BrandNavyDark,
                        BrandNavyPrimary,
                        Color(0xFF0F3E74)
                    )
                )
            )
            .statusBarsPadding()
            .navigationBarsPadding()
            .padding(24.dp)
    ) {
        // Top Language Switcher
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .align(Alignment.TopEnd),
            horizontalArrangement = Arrangement.End
        ) {
            Surface(
                onClick = onToggleLang,
                shape = RoundedCornerShape(20.dp),
                color = Color.White.copy(alpha = 0.15f),
                border = androidx.compose.foundation.BorderStroke(1.dp, Color.White.copy(alpha = 0.3f)),
                modifier = Modifier.testTag("splash_lang_toggle")
            ) {
                Row(
                    verticalAlignment = Alignment.CenterVertically,
                    modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp)
                ) {
                    Icon(
                        imageVector = Icons.Default.Language,
                        contentDescription = "Change Language",
                        tint = Color.White,
                        modifier = Modifier.size(16.dp)
                    )
                    Spacer(modifier = Modifier.width(6.dp))
                    Text(
                        text = if (lang == AppLanguage.BN) "English" else "বাংলা",
                        style = MaterialTheme.typography.labelMedium.copy(
                            color = Color.White,
                            fontWeight = FontWeight.Bold
                        )
                    )
                }
            }
        }

        // Center Brand Identity & Seal
        Column(
            modifier = Modifier
                .fillMaxWidth()
                .align(Alignment.Center),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Box(
                modifier = Modifier
                    .scale(pulseScale)
                    .size(110.dp)
                    .clip(CircleShape)
                    .background(BrandBlueAccent.copy(alpha = 0.25f))
                    .border(2.dp, Color.White.copy(alpha = 0.4f), CircleShape),
                contentAlignment = Alignment.Center
            ) {
                Icon(
                    imageVector = Icons.Default.Shield,
                    contentDescription = "Shield Logo",
                    tint = Color.White,
                    modifier = Modifier.size(60.dp)
                )
            }

            Spacer(modifier = Modifier.height(24.dp))

            Text(
                text = if (lang == AppLanguage.BN) "সতর্ক বাংলাদেশ" else "Satark BD",
                style = MaterialTheme.typography.headlineMedium.copy(
                    fontWeight = FontWeight.Black,
                    fontSize = 28.sp,
                    color = Color.White
                ),
                textAlign = TextAlign.Center
            )

            Spacer(modifier = Modifier.height(8.dp))

            Text(
                text = if (lang == AppLanguage.BN) 
                    "কোম্পানি যাচাই ও প্রতারণা প্রতিরোধে আপনার বিশ্বস্ত প্ল্যাটফর্ম"
                else 
                    "Scam Reporting & Company Verification Shield for Bangladesh",
                style = MaterialTheme.typography.bodyMedium.copy(
                    color = Color.White.copy(alpha = 0.85f),
                    fontSize = 14.sp
                ),
                textAlign = TextAlign.Center,
                modifier = Modifier.padding(horizontal = 16.dp)
            )

            Spacer(modifier = Modifier.height(16.dp))

            // Official Trust Badges
            Row(
                horizontalArrangement = Arrangement.Center,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Surface(
                    color = Color.White.copy(alpha = 0.12f),
                    shape = RoundedCornerShape(12.dp)
                ) {
                    Text(
                        text = if (lang == AppLanguage.BN) "🛡️ RJSC ও ট্রেড লাইসেন্স ডেটাবেজ" else "🛡️ RJSC & Trade License DB",
                        style = MaterialTheme.typography.labelSmall.copy(
                            color = Color(0xFF67E8F9),
                            fontSize = 11.sp,
                            fontWeight = FontWeight.SemiBold
                        ),
                        modifier = Modifier.padding(horizontal = 10.dp, vertical = 5.dp)
                    )
                }
            }
        }

        // Bottom CTA Buttons
        Column(
            modifier = Modifier
                .fillMaxWidth()
                .align(Alignment.BottomCenter),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Button(
                onClick = onContinue,
                colors = ButtonDefaults.buttonColors(
                    containerColor = Color.White,
                    contentColor = BrandNavyPrimary
                ),
                shape = RoundedCornerShape(14.dp),
                modifier = Modifier
                    .fillMaxWidth()
                    .height(52.dp)
                    .testTag("btn_splash_get_started")
            ) {
                Text(
                    text = if (lang == AppLanguage.BN) "শুরু করুন (Get Started)" else "Get Started",
                    style = MaterialTheme.typography.titleMedium.copy(
                        fontWeight = FontWeight.Bold,
                        fontSize = 16.sp
                    )
                )
            }

            Spacer(modifier = Modifier.height(12.dp))

            Text(
                text = if (lang == AppLanguage.BN) 
                    "সাইবার প্রতারণা প্রতিরোধে বাংলাদেশ পুলিশ ও বিটিআরসি নির্দেশিকা সহায়িকা"
                else 
                    "Aligned with BD Cyber Police & BTRC Public Safety Directives",
                style = MaterialTheme.typography.bodySmall.copy(
                    color = Color.White.copy(alpha = 0.6f),
                    fontSize = 11.sp
                ),
                textAlign = TextAlign.Center
            )
        }
    }
}