//
//  StatsTabView.swift
//  Haru_Danim
//
//  통계 탭 (독립 탭): 하루/주간/월간 차트 + 꼬리표·행동 다중 선택 필터
//  - 하루: 꼬리표별 시간/횟수 가로 막대 (비율 비교)
//  - 주간: 행동별 일별 꺾은선(태그 색 + 범례) + 주간 합계 막대 + 행동·꼬리표별 합계/평균 표
//  - 월간: 행동별 주차별/일별 꺾은선 + 월간 합계 막대 + 행동·꼬리표별 합계/평균 표
//

import SwiftUI
import SwiftData
import Charts

struct StatsTabView: View {
    @Environment(AppRouter.self) private var router
    @Query private var sessions: [TimeSession]
    @Query private var entries: [CountEntry]
    @Query(sort: \Tag.sortOrder) private var tags: [Tag]
    @Query(sort: \Action.sortOrder) private var allActions: [Action]

    @State private var span: StatSpan = {
        #if DEBUG
        if let raw = UserDefaults.standard.string(forKey: "statSpan"),
           let span = StatSpan(rawValue: raw) {
            return span
        }
        #endif
        return .day
    }()
    @State private var anchorDayKey: Date = DayMath().dayKey(for: .now)
    @State private var showingFilter = false
    /// 필터는 "해제한 행동"만 저장 → 기본값이 전체 선택이고, 새로 만든 행동도 자동 포함됨.
    /// 꼬리표는 시트에서 소속 행동 일괄 토글용일 뿐, 판정은 행동 단위로만 한다.
    @State private var excludedActionIDs: Set<PersistentIdentifier> = []

    private var math: DayMath { DayMath() }

    private var spanRange: Range<Date> {
        let anchor = math.dayRange(forKey: anchorDayKey).lowerBound
        switch span {
        case .day: return math.dayRange(containing: anchor)
        case .week: return math.weekRange(containing: anchor)
        case .month: return math.monthRange(containing: anchor)
        }
    }

    var body: some View {
        VStack(spacing: 0) {
            periodHeader
            Picker("기간", selection: $span) {
                ForEach(StatSpan.allCases) { span in
                    Text(span.label).tag(span)
                }
            }
            .pickerStyle(.segmented)
            .padding(.horizontal)
            .padding(.bottom, 8)

            if isFiltering {
                filterChip
            }

            ScrollViewReader { proxy in
                ScrollView {
                    VStack(alignment: .leading, spacing: 16) {
                        switch span {
                        case .day:
                            dayCharts
                        case .week:
                            weekCharts
                        case .month:
                            monthCharts
                        }
                    }
                    .padding()
                    Color.clear
                        .frame(height: 1)
                        .id("statsBottom")
                }
                .onAppear {
                    #if DEBUG
                    // 검증용: -statScrollBottom YES면 하단 요약 카드까지 자동 스크롤
                    if UserDefaults.standard.bool(forKey: "statScrollBottom") {
                        DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
                            withAnimation { proxy.scrollTo("statsBottom", anchor: .bottom) }
                        }
                    }
                    #endif
                }
            }
        }
        .background(AppTheme.background)
        .navigationTitle("통계")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .topBarTrailing) {
                Button {
                    showingFilter = true
                } label: {
                    Image(systemName: isFiltering
                        ? "line.3.horizontal.decrease.circle.fill"
                        : "line.3.horizontal.decrease.circle")
                }
            }
        }
        .sheet(isPresented: $showingFilter) {
            RecordFilterSheet(
                title: "통계 필터",
                tags: tags,
                actions: allActions,
                excludedActionIDs: $excludedActionIDs
            )
        }
        .onAppear {
            consumePendingFilter()
            #if DEBUG
            // 검증용: -excludeActions "이름,이름"으로 필터 상태 주입, -statShowFilter YES로 시트 표시
            if let raw = UserDefaults.standard.string(forKey: "excludeActions") {
                let names = Set(raw.split(separator: ",").map { $0.trimmingCharacters(in: .whitespaces) })
                excludedActionIDs = Set(
                    allActions.filter { names.contains($0.name) }.map(\.persistentModelID)
                )
            }
            if UserDefaults.standard.bool(forKey: "statShowFilter") {
                showingFilter = true
            }
            #endif
        }
        .onChange(of: router.pendingStatsActionID) {
            consumePendingFilter()
        }
    }

    /// 모음 탭 '통계 보기'에서 예약한 행동 필터를 적용 (오늘 기준 기간으로 이동)
    private func consumePendingFilter() {
        guard let id = router.pendingStatsActionID else { return }
        // 해당 행동만 남기고 모두 해제
        excludedActionIDs = Set(allActions.map(\.persistentModelID)).subtracting([id])
        anchorDayKey = math.dayKey(for: .now)
        router.pendingStatsActionID = nil
    }

    // MARK: 기간 이동 헤더

    private var periodHeader: some View {
        HStack {
            Button {
                movePeriod(-1)
            } label: {
                Image(systemName: "chevron.left")
                    .frame(width: 44, height: 36)
                    .contentShape(Rectangle())
            }
            Spacer()
            VStack(spacing: 1) {
                Text(periodLabel)
                    .font(.headline)
                if spanRange.contains(.now) {
                    Text(currentPeriodLabel)
                        .font(.caption2)
                        .foregroundStyle(AppTheme.green)
                }
            }
            Spacer()
            Button {
                movePeriod(1)
            } label: {
                Image(systemName: "chevron.right")
                    .frame(width: 44, height: 36)
                    .contentShape(Rectangle())
            }
            Button(currentPeriodLabel) {
                anchorDayKey = math.dayKey(for: .now)
            }
            .font(.caption)
            .buttonStyle(.bordered)
            .buttonBorderShape(.capsule)
        }
        .padding(.horizontal)
        .padding(.vertical, 10)
        .tint(AppTheme.green)
    }

    private var currentPeriodLabel: String {
        switch span {
        case .day: return "오늘"
        case .week: return "이번 주"
        case .month: return "이번 달"
        }
    }

    private var periodLabel: String {
        let keys = math.dayKeys(in: spanRange)
        switch span {
        case .day:
            return Format.fullDate(anchorDayKey)
        case .week:
            guard let first = keys.first, let last = keys.last else { return "" }
            return "\(Format.shortDate(first)) ~ \(Format.shortDate(last))"
        case .month:
            return anchorDayKey.formatted(.dateTime.year().month())
        }
    }

    private func movePeriod(_ delta: Int) {
        let cal = math.calendar
        switch span {
        case .day:
            anchorDayKey = cal.date(byAdding: .day, value: delta, to: anchorDayKey)!
        case .week:
            anchorDayKey = cal.date(byAdding: .day, value: 7 * delta, to: anchorDayKey)!
        case .month:
            anchorDayKey = cal.date(byAdding: .month, value: delta, to: anchorDayKey)!
        }
    }

    // MARK: 필터 (꼬리표 트리에서 행동 다중 선택, 기본 전체 선택)

    private var isFiltering: Bool {
        !excludedActionIDs.isEmpty
    }

    /// 행동이 통계에 포함되는지: 행동 단위로만 판정 (꼬리표 일부 행동만 선택해도 정상 반영)
    private func passesFilter(_ action: Action) -> Bool {
        !excludedActionIDs.contains(action.persistentModelID)
    }

    private var filteredActions: [Action] {
        allActions.filter(passesFilter)
    }

    private var filterChip: some View {
        HStack(spacing: 6) {
            Image(systemName: "line.3.horizontal.decrease")
                .font(.caption2.weight(.semibold))
            Text("행동 \(filteredActions.count)/\(allActions.count)개 표시 중")
                .font(.caption.weight(.semibold))
                .lineLimit(1)
            Button {
                withAnimation {
                    excludedActionIDs = []
                }
            } label: {
                Image(systemName: "xmark.circle.fill")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                    .padding(4)
                    .contentShape(Rectangle())
            }
            .buttonStyle(.plain)
        }
        .foregroundStyle(AppTheme.green)
        .padding(.leading, 10)
        .padding(.trailing, 2)
        .padding(.vertical, 4)
        .background(AppTheme.green.opacity(0.12), in: Capsule())
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(.horizontal)
        .padding(.bottom, 6)
    }

    // MARK: 데이터 수집 (구간 겹침으로 하루 경계 분할 자동 반영)

    private func segments(in range: Range<Date>) -> [SessionSegmentItem] {
        let now = Date.now
        var items: [SessionSegmentItem] = []
        for session in sessions {
            guard let action = session.action, passesFilter(action) else { continue }
            let end = session.endAt ?? now
            let lower = max(session.startAt, range.lowerBound)
            let upper = min(end, range.upperBound)
            guard lower < upper else { continue }
            items.append(SessionSegmentItem(session: session, action: action, range: lower..<upper))
        }
        return items
    }

    private func counts(in range: Range<Date>) -> [CountItem] {
        entries
            .filter { range.contains($0.timestamp) }
            .compactMap { entry in
                entry.action.map { CountItem(entry: entry, action: $0) }
            }
            .filter { passesFilter($0.action) }
    }

    /// 평균 계산용: 기간 내 "이미 시작된" 날 수 (미래 날짜로 평균이 희석되지 않게)
    private var elapsedDayCount: Int {
        max(
            math.dayKeys(in: spanRange)
                .filter { math.dayRange(forKey: $0).lowerBound <= .now }
                .count,
            1
        )
    }

    // MARK: 하루 — 꼬리표별 가로 막대 (비율 비교)

    @ViewBuilder
    private var dayCharts: some View {
        let stats = tagStats(in: spanRange)
        tagTimeBarCard(stats)
        tagCountBarCard(stats)
    }

    private func tagStats(in range: Range<Date>) -> [TagStat] {
        var seconds: [String: TimeInterval] = [:]
        var countsByTag: [String: Int] = [:]
        var colors: [String: Color] = [:]

        func tagNames(for action: Action) -> [(String, Color)] {
            if action.tags.isEmpty { return [("꼬리표 없음", Color.gray)] }
            return action.sortedTags.map { ($0.name, $0.color) }
        }

        for item in segments(in: range) {
            for (name, color) in tagNames(for: item.action) {
                seconds[name, default: 0] += item.duration
                colors[name] = color
            }
        }
        for item in counts(in: range) {
            for (name, color) in tagNames(for: item.action) {
                countsByTag[name, default: 0] += item.entry.amount
                colors[name] = color
            }
        }

        let names = Set(seconds.keys).union(countsByTag.keys)
        return names
            .map { name in
                TagStat(
                    name: name,
                    color: colors[name] ?? .gray,
                    seconds: seconds[name] ?? 0,
                    count: countsByTag[name] ?? 0
                )
            }
            .sorted { $0.seconds > $1.seconds }
    }

    @ViewBuilder
    private func tagTimeBarCard(_ stats: [TagStat]) -> some View {
        let timeStats = stats.filter { $0.seconds > 0 }
        chartCard("꼬리표별 시간 비교") {
            if timeStats.isEmpty {
                emptyChartText
            } else {
                Chart(timeStats) { stat in
                    BarMark(
                        x: .value("시간", stat.seconds / 3600),
                        y: .value("꼬리표", stat.name)
                    )
                    .foregroundStyle(stat.color)
                    .cornerRadius(4)
                    .annotation(position: .trailing) {
                        Text(Format.durationShort(stat.seconds))
                            .font(.caption2)
                            .foregroundStyle(.secondary)
                    }
                }
                .chartXAxisLabel("시간(h)")
                .frame(height: CGFloat(timeStats.count) * 44 + 30)
            }
        }
    }

    @ViewBuilder
    private func tagCountBarCard(_ stats: [TagStat]) -> some View {
        let countStats = stats.filter { $0.count > 0 }.sorted { $0.count > $1.count }
        chartCard("꼬리표별 횟수 비교") {
            if countStats.isEmpty {
                emptyChartText
            } else {
                Chart(countStats) { stat in
                    BarMark(
                        x: .value("횟수", stat.count),
                        y: .value("꼬리표", stat.name)
                    )
                    .foregroundStyle(stat.color)
                    .cornerRadius(4)
                    .annotation(position: .trailing) {
                        Text("\(stat.count)회")
                            .font(.caption2)
                            .foregroundStyle(.secondary)
                    }
                }
                .chartXAxisLabel("횟수")
                .frame(height: CGFloat(countStats.count) * 44 + 30)
            }
        }
    }

    // MARK: 주간 — 행동별 일별 꺾은선 + 주간 합계 막대

    @ViewBuilder
    private var weekCharts: some View {
        dailyLineCard("행동별 시간 (일별)", type: .time, weekdayAxis: true)
        dailyLineCard("행동별 횟수 (일별)", type: .count, weekdayAxis: true)
        totalsBarCard("주간 시간 합계", type: .time)
        totalsBarCard("주간 횟수 합계", type: .count)
        summaryTableCard(
            "행동별 합계·평균",
            timeRows: actionSummaryRows(for: .time),
            countRows: actionSummaryRows(for: .count)
        )
        summaryTableCard(
            "꼬리표별 합계·평균",
            timeRows: tagSummaryRows(for: .time),
            countRows: tagSummaryRows(for: .count)
        )
    }

    // MARK: 월간 — 행동별 주차별/일별 꺾은선 + 월간 합계 막대

    @ViewBuilder
    private var monthCharts: some View {
        weeklyLineCard("행동별 시간 (주차별)", type: .time)
        weeklyLineCard("행동별 횟수 (주차별)", type: .count)
        dailyLineCard("행동별 시간 (일별)", type: .time, weekdayAxis: false)
        dailyLineCard("행동별 횟수 (일별)", type: .count, weekdayAxis: false)
        totalsBarCard("월간 시간 합계", type: .time)
        totalsBarCard("월간 횟수 합계", type: .count)
        summaryTableCard(
            "행동별 합계·평균",
            timeRows: actionSummaryRows(for: .time),
            countRows: actionSummaryRows(for: .count)
        )
        summaryTableCard(
            "꼬리표별 합계·평균",
            timeRows: tagSummaryRows(for: .time),
            countRows: tagSummaryRows(for: .count)
        )
    }

    // MARK: 행동별 시리즈 계산

    private struct ActionDayPoint: Identifiable {
        let dayKey: Date
        let actionName: String
        let value: Double

        var id: String { "\(dayKey.timeIntervalSinceReferenceDate)-\(actionName)" }
    }

    private struct ActionWeekPoint: Identifiable {
        let weekLabel: String
        let actionName: String
        let value: Double

        var id: String { "\(weekLabel)-\(actionName)" }
    }

    private struct ActionTotal: Identifiable {
        let name: String
        let color: Color
        let value: Double

        var id: String { name }
    }

    /// 기간 내 값이 있는(0이 아닌) 필터 통과 행동들 — 시리즈/범례 대상
    private func activeActions(for type: TrackingType) -> [Action] {
        let agg = Aggregator(math: math)
        return filteredActions
            .filter { $0.trackingType == type }
            .filter { action in
                switch type {
                case .time: return agg.seconds(for: action, in: spanRange) > 0
                case .count: return agg.count(for: action, in: spanRange) > 0
                }
            }
    }

    private func dailyPoints(for actions: [Action], type: TrackingType) -> [ActionDayPoint] {
        let agg = Aggregator(math: math)
        var result: [ActionDayPoint] = []
        for key in math.dayKeys(in: spanRange) {
            let range = math.dayRange(forKey: key)
            for action in actions {
                let value: Double = switch type {
                case .time: agg.seconds(for: action, in: range) / 3600
                case .count: Double(agg.count(for: action, in: range))
                }
                result.append(ActionDayPoint(dayKey: key, actionName: action.name, value: value))
            }
        }
        return result
    }

    /// 한 달을 주 단위(주 시작 요일 설정 기준, 월 경계에서 잘림)로 쪼갠 범위들
    private var weekRangesInMonth: [Range<Date>] {
        let range = spanRange
        var result: [Range<Date>] = []
        var cursor = range.lowerBound
        while cursor < range.upperBound {
            let week = math.weekRange(containing: cursor)
            result.append(max(week.lowerBound, range.lowerBound)..<min(week.upperBound, range.upperBound))
            cursor = week.upperBound
        }
        return result
    }

    private func weeklyPoints(for actions: [Action], type: TrackingType) -> [ActionWeekPoint] {
        let agg = Aggregator(math: math)
        var result: [ActionWeekPoint] = []
        for (index, weekRange) in weekRangesInMonth.enumerated() {
            for action in actions {
                let value: Double = switch type {
                case .time: agg.seconds(for: action, in: weekRange) / 3600
                case .count: Double(agg.count(for: action, in: weekRange))
                }
                result.append(ActionWeekPoint(weekLabel: "\(index + 1)주차", actionName: action.name, value: value))
            }
        }
        return result
    }

    private func totals(for type: TrackingType) -> [ActionTotal] {
        let agg = Aggregator(math: math)
        return activeActions(for: type)
            .map { action in
                let value: Double = switch type {
                case .time: agg.seconds(for: action, in: spanRange)
                case .count: Double(agg.count(for: action, in: spanRange))
                }
                return ActionTotal(name: action.name, color: action.color, value: value)
            }
            .sorted { $0.value > $1.value }
    }

    private func valueLabel(_ value: Double, type: TrackingType) -> String {
        switch type {
        case .time: return Format.durationShort(value)
        case .count: return "\(Int(value.rounded()))회"
        }
    }

    // MARK: 꺾은선 카드 (선 색 = 행동/태그 색, 범례 표시)

    @ViewBuilder
    private func dailyLineCard(_ title: String, type: TrackingType, weekdayAxis: Bool) -> some View {
        let actions = activeActions(for: type)
        let names = actions.map(\.name)
        let colors = actions.map(\.color)
        chartCard(title) {
            if actions.isEmpty {
                emptyChartText
            } else {
                Chart(dailyPoints(for: actions, type: type)) { point in
                    LineMark(
                        x: .value("날짜", point.dayKey, unit: .day),
                        y: .value(type == .time ? "시간" : "횟수", point.value)
                    )
                    .foregroundStyle(by: .value("행동", point.actionName))
                    .symbol(by: .value("행동", point.actionName))
                    .interpolationMethod(.monotone)
                }
                .chartForegroundStyleScale(domain: names, range: colors)
                .chartXAxis {
                    if weekdayAxis {
                        AxisMarks(values: .stride(by: .day)) { value in
                            AxisGridLine()
                            AxisValueLabel {
                                if let date = value.as(Date.self) {
                                    Text(Format.weekdayShort(math.calendar.component(.weekday, from: date)))
                                }
                            }
                        }
                    } else {
                        AxisMarks { _ in
                            AxisGridLine()
                            AxisValueLabel(format: .dateTime.day())
                        }
                    }
                }
                .chartYAxisLabel(type == .time ? "시간(h)" : "횟수")
                .frame(height: 200)
            }
        }
    }

    @ViewBuilder
    private func weeklyLineCard(_ title: String, type: TrackingType) -> some View {
        let actions = activeActions(for: type)
        let names = actions.map(\.name)
        let colors = actions.map(\.color)
        chartCard(title) {
            if actions.isEmpty {
                emptyChartText
            } else {
                Chart(weeklyPoints(for: actions, type: type)) { point in
                    LineMark(
                        x: .value("주차", point.weekLabel),
                        y: .value(type == .time ? "시간" : "횟수", point.value)
                    )
                    .foregroundStyle(by: .value("행동", point.actionName))
                    .symbol(by: .value("행동", point.actionName))
                    .interpolationMethod(.monotone)
                }
                .chartForegroundStyleScale(domain: names, range: colors)
                .chartYAxisLabel(type == .time ? "시간(h)" : "횟수")
                .frame(height: 200)
            }
        }
    }

    // MARK: 합계 막대 카드 (기간 누적 비율 비교)

    @ViewBuilder
    private func totalsBarCard(_ title: String, type: TrackingType) -> some View {
        let items = totals(for: type)
        chartCard(title) {
            if items.isEmpty {
                emptyChartText
            } else {
                Chart(items) { item in
                    BarMark(
                        x: .value(type == .time ? "시간" : "횟수", type == .time ? item.value / 3600 : item.value),
                        y: .value("행동", item.name)
                    )
                    .foregroundStyle(item.color)
                    .cornerRadius(4)
                    .annotation(position: .trailing) {
                        Text(valueLabel(item.value, type: type))
                            .font(.caption2)
                            .foregroundStyle(.secondary)
                    }
                }
                .chartXAxisLabel(type == .time ? "시간(h)" : "횟수")
                .frame(height: CGFloat(items.count) * 40 + 30)
            }
        }
    }

    // MARK: 행동·꼬리표별 합계/평균 요약 표 (주간/월간, 필터 반영)

    private struct SummaryRowItem: Identifiable {
        let name: String
        let color: Color
        let symbol: String
        /// 시간형은 초, 횟수형은 횟수
        let total: Double
        let type: TrackingType

        var id: String { "\(type == .time ? "time" : "count")-\(name)" }
    }

    /// 평균 계산용: 월 안에서 이미 시작된 주 수 (미래 주로 평균이 희석되지 않게)
    private var elapsedWeekCount: Int {
        max(weekRangesInMonth.filter { $0.lowerBound <= .now }.count, 1)
    }

    private func actionSummaryRows(for type: TrackingType) -> [SummaryRowItem] {
        let agg = Aggregator(math: math)
        return activeActions(for: type)
            .map { action in
                let total: Double = switch type {
                case .time: agg.seconds(for: action, in: spanRange)
                case .count: Double(agg.count(for: action, in: spanRange))
                }
                return SummaryRowItem(name: action.name, color: action.color, symbol: action.symbolName, total: total, type: type)
            }
            .sorted { $0.total > $1.total }
    }

    private func tagSummaryRows(for type: TrackingType) -> [SummaryRowItem] {
        let stats = tagStats(in: spanRange)
        let rows: [SummaryRowItem] = switch type {
        case .time:
            stats.filter { $0.seconds > 0 }
                .map { SummaryRowItem(name: $0.name, color: $0.color, symbol: "tag.fill", total: $0.seconds, type: .time) }
        case .count:
            stats.filter { $0.count > 0 }
                .map { SummaryRowItem(name: $0.name, color: $0.color, symbol: "tag.fill", total: Double($0.count), type: .count) }
        }
        return rows.sorted { $0.total > $1.total }
    }

    private func averageLabel(_ value: Double, type: TrackingType) -> String {
        switch type {
        case .time: return Format.durationShort(value)
        case .count: return String(format: "%.1f회", value)
        }
    }

    @ViewBuilder
    private func summaryTableCard(_ title: String, timeRows: [SummaryRowItem], countRows: [SummaryRowItem]) -> some View {
        chartCard(title) {
            if timeRows.isEmpty && countRows.isEmpty {
                emptyChartText
            } else {
                VStack(alignment: .leading, spacing: 14) {
                    if !timeRows.isEmpty {
                        summaryGrid(sectionLabel: "시간", rows: timeRows)
                    }
                    if !timeRows.isEmpty && !countRows.isEmpty {
                        Divider()
                    }
                    if !countRows.isEmpty {
                        summaryGrid(sectionLabel: "횟수", rows: countRows)
                    }
                }
            }
        }
    }

    private func summaryGrid(sectionLabel: String, rows: [SummaryRowItem]) -> some View {
        Grid(alignment: .leading, horizontalSpacing: 10, verticalSpacing: 12) {
            GridRow {
                Text(sectionLabel)
                    .fontWeight(.semibold)
                Text("합계")
                    .gridColumnAlignment(.trailing)
                Text("하루 평균")
                    .gridColumnAlignment(.trailing)
                if span == .month {
                    Text("주 평균")
                        .gridColumnAlignment(.trailing)
                }
            }
            .font(.caption2)
            .foregroundStyle(.secondary)
            ForEach(rows) { row in
                GridRow {
                    HStack(spacing: 8) {
                        Image(systemName: row.symbol)
                            .font(.system(size: 11, weight: .semibold))
                            .foregroundStyle(.white)
                            .frame(width: 24, height: 24)
                            .background(row.color, in: RoundedRectangle(cornerRadius: 7, style: .continuous))
                        Text(row.name)
                            .font(.footnote)
                            .lineLimit(1)
                    }
                    .frame(maxWidth: .infinity, alignment: .leading)
                    Text(valueLabel(row.total, type: row.type))
                        .font(.footnote.weight(.semibold).monospacedDigit())
                        .foregroundStyle(AppTheme.green)
                    Text(averageLabel(row.total / Double(elapsedDayCount), type: row.type))
                        .font(.footnote.monospacedDigit())
                        .foregroundStyle(.secondary)
                    if span == .month {
                        Text(averageLabel(row.total / Double(elapsedWeekCount), type: row.type))
                            .font(.footnote.monospacedDigit())
                            .foregroundStyle(.secondary)
                    }
                }
            }
        }
    }

    // MARK: 공통

    private func chartCard(_ title: String, @ViewBuilder content: () -> some View) -> some View {
        VStack(alignment: .leading, spacing: 12) {
            Text(title)
                .font(.subheadline.weight(.semibold))
            content()
        }
        .padding(14)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(AppTheme.surface, in: RoundedRectangle(cornerRadius: 16, style: .continuous))
    }

    private var emptyChartText: some View {
        Text("표시할 기록이 없어요")
            .font(.caption)
            .foregroundStyle(.secondary)
            .frame(maxWidth: .infinity)
            .padding(.vertical, 24)
    }
}

// MARK: - 태그별 집계 항목

struct TagStat: Identifiable {
    let name: String
    let color: Color
    let seconds: TimeInterval
    let count: Int

    var id: String { name }
}