package com.craigvg.lichun_android.ui.screens.home

import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.Chat
import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
import androidx.compose.material.icons.filled.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.hilt.navigation.compose.hiltViewModel
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import com.craigvg.lichun_android.R
import com.craigvg.lichun_android.ui.screens.home.components.*
import com.craigvg.lichun_android.ui.theme.AppColors
import com.craigvg.lichun_android.ui.theme.AppSpacing
import com.craigvg.lichun_android.ui.theme.AppTypography
import com.craigvg.lichun_android.utils.HapticFeedback
import com.craigvg.lichun_android.viewmodel.GameStateViewModel
import com.craigvg.lichun_android.viewmodel.PlayerViewModel

/**
 * Home screen - Main dashboard
 * Ported from iOS HomeView.swift
 */
@Composable
fun HomeScreen(
    gameStateViewModel: GameStateViewModel = hiltViewModel(),
    playerViewModel: PlayerViewModel = hiltViewModel(),
    onSettings: () -> Unit = {},
    onMessages: () -> Unit = {},
    onCharacters: () -> Unit = {},
    onMore: () -> Unit = {},
    onCharacterTap: () -> Unit = {},
    onEnergyRefill: () -> Unit = {},
    onDailyQuests: () -> Unit = {},
    onDailyRewards: () -> Unit = {},
    onLifeGoals: () -> Unit = {},
    onPerformActivity: () -> Unit = {}
) {
    val person by playerViewModel.person.collectAsStateWithLifecycle()
    val player by playerViewModel.player.collectAsStateWithLifecycle()
    val lifeEvents by gameStateViewModel.lifeEvents.collectAsStateWithLifecycle()
    val isConnected by gameStateViewModel.isConnected.collectAsStateWithLifecycle()
    val formattedTime by gameStateViewModel.formattedTime.collectAsStateWithLifecycle()
    val season by gameStateViewModel.season.collectAsStateWithLifecycle()
    val seasonEmoji by gameStateViewModel.seasonEmoji.collectAsStateWithLifecycle()
    val date by gameStateViewModel.date.collectAsStateWithLifecycle()
    val gameSpeed by gameStateViewModel.gameSpeed.collectAsStateWithLifecycle()
    val energy by gameStateViewModel.energy.collectAsStateWithLifecycle()
    val money by gameStateViewModel.money.collectAsStateWithLifecycle()
    val diamonds by gameStateViewModel.diamonds.collectAsStateWithLifecycle()
    val health by gameStateViewModel.health.collectAsStateWithLifecycle()
    val happiness by gameStateViewModel.happiness.collectAsStateWithLifecycle()
    val intelligence by gameStateViewModel.intelligence.collectAsStateWithLifecycle()
    val prestige by gameStateViewModel.prestige.collectAsStateWithLifecycle()

    // What-now hub inputs.
    val currentQuestion by gameStateViewModel.currentQuestion.collectAsStateWithLifecycle()
    val currentMessageEvent by gameStateViewModel.currentMessageEvent.collectAsStateWithLifecycle()
    val unclaimedEventCount by gameStateViewModel.unclaimedEventCount.collectAsStateWithLifecycle()
    val dailyRewardState by gameStateViewModel.dailyRewardState.collectAsStateWithLifecycle()
    val dailyQuestsState by gameStateViewModel.dailyQuestsState.collectAsStateWithLifecycle()

    val scrollState = rememberScrollState()
    val view = LocalView.current

    val tooltipMessage = stringResource(R.string.tooltip_home_claim_rewards)
    LaunchedEffect(Unit) {
        gameStateViewModel.showTooltipIfNeeded("home_claim_rewards", tooltipMessage)
    }

    val hasPendingEvent = currentQuestion != null || currentMessageEvent != null
    val canClaimDailyReward = dailyRewardState?.let { it.canClaim && !it.todaysClaimed } ?: false
    val claimableQuestCount = dailyQuestsState?.quests?.count { it.canClaim } ?: 0
    val conversationCount = player.activeConversations.size
    val hasAnythingToDo = hasPendingEvent ||
        conversationCount > 0 ||
        unclaimedEventCount > 0 ||
        canClaimDailyReward ||
        claimableQuestCount > 0

    Column(
        modifier = Modifier
            .fillMaxSize()
            .background(AppColors.background)
            .verticalScroll(scrollState)
            .padding(horizontal = AppSpacing.md)
    ) {
        Spacer(modifier = Modifier.height(AppSpacing.md))

        StatusHeaderCard(
            date = date,
            time = formattedTime,
            season = season,
            seasonEmoji = seasonEmoji,
            name = person.fullName,
            isConnected = isConnected,
            onCharacters = onCharacters,
            onMessages = onMessages,
            onSettings = onSettings
        )

        Spacer(modifier = Modifier.height(AppSpacing.md))

        ResourcesRow(
            energy = energy,
            money = money,
            diamonds = diamonds,
            onEnergyClick = onEnergyRefill
        )

        Spacer(modifier = Modifier.height(AppSpacing.md))

        MainCharacterView(
            imageUrl = person.image,
            name = person.fullName,
            age = person.ageYears,
            mood = person.mood,
            onTap = onCharacterTap
        )

        Spacer(modifier = Modifier.height(AppSpacing.md))

        // "What now?" hub — surface the things waiting for the player. When the
        // player is all caught up, an idle nudge points them at a useful action.
        if (hasAnythingToDo) {
            WhatNowHub(
                unclaimedEventCount = unclaimedEventCount,
                conversationCount = conversationCount,
                canClaimDailyReward = canClaimDailyReward,
                claimableQuestCount = claimableQuestCount,
                onMessages = onMessages,
                onDailyRewards = onDailyRewards,
                onDailyQuests = onDailyQuests,
                onClaimNudge = { HapticFeedback.light(view) }
            )
        } else {
            IdleNudgeCard(onPerformActivity = onPerformActivity, onLifeGoals = onLifeGoals)
        }

        Spacer(modifier = Modifier.height(AppSpacing.md))

        QuickStatsCard(
            health = health,
            happiness = happiness,
            intelligence = intelligence,
            prestige = prestige
        )

        Spacer(modifier = Modifier.height(AppSpacing.md))

        GameControlsCard(
            gameSpeed = gameSpeed,
            onSpeedChange = { speed -> gameStateViewModel.setSpeed(speed) },
            onRestart = { gameStateViewModel.restart() }
        )

        Spacer(modifier = Modifier.height(AppSpacing.md))

        LifeTimelineCard(
            events = lifeEvents,
            onClaimEvent = { event -> gameStateViewModel.claimEvent(event) }
        )

        Spacer(modifier = Modifier.height(AppSpacing.xl))
    }
}

@Composable
private fun WhatNowHub(
    unclaimedEventCount: Int,
    conversationCount: Int,
    canClaimDailyReward: Boolean,
    claimableQuestCount: Int,
    onMessages: () -> Unit,
    onDailyRewards: () -> Unit,
    onDailyQuests: () -> Unit,
    onClaimNudge: () -> Unit
) {
    androidx.compose.material3.Card(
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(AppSpacing.cornerRadius),
        colors = androidx.compose.material3.CardDefaults.cardColors(containerColor = AppColors.surfaceElevated),
        elevation = androidx.compose.material3.CardDefaults.cardElevation(defaultElevation = 2.dp)
    ) {
        Column(modifier = Modifier.padding(AppSpacing.md)) {
            Row(verticalAlignment = Alignment.CenterVertically) {
                androidx.compose.material3.Icon(
                    Icons.Default.AutoAwesome,
                    null,
                    tint = AppColors.primary,
                    modifier = Modifier.size(16.dp)
                )
                Spacer(Modifier.width(AppSpacing.xs))
                androidx.compose.material3.Text("What now?", style = AppTypography.bodyBold, color = AppColors.primaryText)
            }
            Spacer(Modifier.height(AppSpacing.xs))

            if (unclaimedEventCount > 0) {
                WhatNowRow(
                    icon = Icons.Default.CardGiftcard,
                    tint = AppColors.primary,
                    title = "Claim your rewards",
                    subtitle = "$unclaimedEventCount life event${if (unclaimedEventCount == 1) "" else "s"} waiting below",
                    onClick = onClaimNudge
                )
            }
            if (conversationCount > 0) {
                WhatNowRow(
                    icon = Icons.AutoMirrored.Filled.Chat,
                    tint = AppColors.loveInterest,
                    title = "Catch up on messages",
                    subtitle = "$conversationCount conversation${if (conversationCount == 1) "" else "s"}",
                    onClick = onMessages
                )
            }
            if (canClaimDailyReward) {
                WhatNowRow(
                    icon = Icons.Default.CalendarMonth,
                    tint = AppColors.money,
                    title = "Daily reward ready",
                    subtitle = "Claim today's login bonus",
                    onClick = onDailyRewards
                )
            }
            if (claimableQuestCount > 0) {
                WhatNowRow(
                    icon = Icons.Default.Checklist,
                    tint = AppColors.happiness,
                    title = "Finish daily quests",
                    subtitle = "$claimableQuestCount reward${if (claimableQuestCount == 1) "" else "s"} to claim",
                    onClick = onDailyQuests
                )
            }
        }
    }
}

@Composable
private fun WhatNowRow(
    icon: ImageVector,
    tint: Color,
    title: String,
    subtitle: String,
    onClick: () -> Unit
) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .clickable(onClick = onClick)
            .padding(vertical = AppSpacing.xs),
        verticalAlignment = Alignment.CenterVertically
    ) {
        Box(
            modifier = Modifier
                .size(36.dp)
                .background(tint.copy(alpha = 0.15f), CircleShape),
            contentAlignment = Alignment.Center
        ) {
            androidx.compose.material3.Icon(icon, null, tint = tint, modifier = Modifier.size(16.dp))
        }
        Spacer(Modifier.width(AppSpacing.sm))
        Column(modifier = Modifier.weight(1f)) {
            androidx.compose.material3.Text(title, style = AppTypography.bodyBold, color = AppColors.primaryText)
            androidx.compose.material3.Text(subtitle, style = AppTypography.caption, color = AppColors.secondaryText, maxLines = 1)
        }
        androidx.compose.material3.Icon(
            Icons.AutoMirrored.Filled.KeyboardArrowRight,
            null,
            tint = AppColors.secondaryText.copy(alpha = 0.6f),
            modifier = Modifier.size(16.dp)
        )
    }
}

@Composable
private fun IdleNudgeCard(
    onPerformActivity: () -> Unit,
    onLifeGoals: () -> Unit
) {
    androidx.compose.material3.Card(
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(AppSpacing.cornerRadius),
        colors = androidx.compose.material3.CardDefaults.cardColors(containerColor = AppColors.primary.copy(alpha = 0.08f)),
        elevation = androidx.compose.material3.CardDefaults.cardElevation(defaultElevation = 0.dp)
    ) {
        Column(modifier = Modifier.padding(AppSpacing.md)) {
            Row(verticalAlignment = Alignment.CenterVertically) {
                androidx.compose.material3.Icon(
                    Icons.Default.Lightbulb,
                    null,
                    tint = AppColors.accentDark,
                    modifier = Modifier.size(18.dp)
                )
                Spacer(Modifier.width(AppSpacing.xs))
                androidx.compose.material3.Text(
                    "All caught up!",
                    style = AppTypography.bodyBold,
                    color = AppColors.primaryText
                )
            }
            Spacer(Modifier.height(AppSpacing.xxs))
            androidx.compose.material3.Text(
                "Take charge of your day - do an activity to grow your character, or check your life goals.",
                style = AppTypography.caption,
                color = AppColors.secondaryText
            )
            Spacer(Modifier.height(AppSpacing.sm))
            Row(horizontalArrangement = Arrangement.spacedBy(AppSpacing.sm)) {
                androidx.compose.material3.Button(
                    onClick = onPerformActivity,
                    modifier = Modifier.weight(1f),
                    shape = RoundedCornerShape(AppSpacing.smallCornerRadius),
                    colors = androidx.compose.material3.ButtonDefaults.buttonColors(containerColor = AppColors.primary, contentColor = Color.White)
                ) {
                    androidx.compose.material3.Text("Do an Activity", style = AppTypography.captionBold)
                }
                androidx.compose.material3.OutlinedButton(
                    onClick = onLifeGoals,
                    modifier = Modifier.weight(1f),
                    shape = RoundedCornerShape(AppSpacing.smallCornerRadius),
                    colors = androidx.compose.material3.ButtonDefaults.outlinedButtonColors(contentColor = AppColors.primary)
                ) {
                    androidx.compose.material3.Text("Life Goals", style = AppTypography.captionBold)
                }
            }
        }
    }
}