// Voice bar widget (SDD-097). Replaces the legacy `_AudioControls`
// block that used to live in `main.dart`. Driven by the
// `BridgeEvent::VoiceState` stream the bridge publishes from the
// core's transmit-mode selector + release-tail timer.

import 'package:flutter/material.dart';

import '../l10n/generated/app_localizations.dart';
import '../main.dart' show PttCapabilityBadge;
import '../src/rust/api.dart' as rust;

/// Voice bar — surfaces the live voice state, mode badge, hard-mute
/// toggle, level meter, and a leave-channel affordance.
class VoiceBar extends StatelessWidget {
  /// Construct a voice bar.
  const VoiceBar({
    super.key,
    required this.inChannel,
    required this.transmitMode,
    required this.hardMute,
    required this.outputMuted,
    required this.releaseTailMs,
    required this.channelName,
    required this.audioStats,
    required this.pttLevel,
    required this.pttBackendId,
    required this.pttBoundInputClass,
    required this.pttBoundKeyLabel,
    required this.onToggleMute,
    required this.onToggleOutputMute,
    required this.onConfigure,
  });

  /// True when the session is currently joined to a voice channel.
  final bool inChannel;

  /// Active transmit mode.
  final rust.BridgeTransmitMode transmitMode;

  /// Hard-mute clamp state.
  final bool hardMute;

  /// Speaker (output) mute state. Mirrors the server-broadcast
  /// `ClientOutputMuted` flag plus the engine's local output
  /// silencer — toggling this hushes incoming voice immediately
  /// AND tells the server so other clients see the headphone-off
  /// icon next to our name.
  final bool outputMuted;

  /// Configured release-tail in milliseconds (0..=500). Surfaced as
  /// a hint underneath the mode badge.
  final int releaseTailMs;

  /// Channel display name to show in the channel-name pill. Empty
  /// string suppresses the pill (typically when `!inChannel`).
  final String channelName;

  /// Audio statistics (TX/RX frames + ptt_active) to drive the
  /// level meter. Pass `null` to render an idle meter.
  final rust.BridgeAudioStats? audioStats;

  /// PTT capability badge inputs — passed through to
  /// [`PttCapabilityBadge`].
  final String pttLevel;

  /// Backend id, e.g. `focused`, `windows-raw-input`.
  final String pttBackendId;

  /// Coarse bound input class.
  final String pttBoundInputClass;

  /// Platform-neutral key label captured by the binding dialog.
  final String pttBoundKeyLabel;

  /// Toggle the hard-mute clamp.
  final VoidCallback onToggleMute;

  /// Toggle speaker (output) mute.
  final VoidCallback onToggleOutputMute;

  /// Open the voice settings dialog. This is the SINGLE entry point
  /// for transmit-mode selection, PTT key binding, and release-tail
  /// configuration. The capability badge below is information-only
  /// and intentionally does NOT have its own configure affordance.
  final VoidCallback onConfigure;

  String _modeLabel(AppL10n l10n) {
    switch (transmitMode) {
      case rust.BridgeTransmitMode.ptt:
        return l10n.voiceModePtt;
      case rust.BridgeTransmitMode.continuous:
        return l10n.voiceModeContinuous;
      case rust.BridgeTransmitMode.voiceActivity:
        return '${l10n.voiceModeVoiceActivity} (${l10n.voiceModeComingSoon})';
    }
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppL10n.of(context);
    final theme = Theme.of(context);
    final stats = audioStats;
    final levelActive = stats?.pttActive ?? false;
    final isPtt = transmitMode == rust.BridgeTransmitMode.ptt;

    return Card(
      margin: EdgeInsets.zero,
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Row 1: channel pill + mute toggle. The pill is
            // wrapped in `Flexible` so very long channel names
            // truncate with an ellipsis instead of overflowing the
            // Voice Bar's column width (320 dp in the wide layout)
            // and pushing the mute icons under the adjacent channel
            // tree.
            Row(
              children: [
                if (inChannel && channelName.isNotEmpty) ...[
                  Flexible(
                    flex: 100,
                    fit: FlexFit.loose,
                    child: Container(
                      padding: const EdgeInsets.symmetric(
                        horizontal: 10,
                        vertical: 4,
                      ),
                      decoration: BoxDecoration(
                        color: theme.colorScheme.primaryContainer,
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          Icon(
                            Icons.tag,
                            size: 14,
                            color: theme.colorScheme.onPrimaryContainer,
                          ),
                          const SizedBox(width: 4),
                          Flexible(
                            child: Text(
                              channelName,
                              maxLines: 1,
                              overflow: TextOverflow.ellipsis,
                              softWrap: false,
                              style: TextStyle(
                                color: theme.colorScheme.onPrimaryContainer,
                                fontWeight: FontWeight.w600,
                              ),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ],
                const SizedBox(width: 8),
                const Spacer(),
                IconButton(
                  tooltip: l10n.voiceOutputMuteLabel,
                  icon: Icon(
                    outputMuted ? Icons.headset_off : Icons.headset,
                  ),
                  isSelected: outputMuted,
                  selectedIcon: const Icon(Icons.headset_off),
                  onPressed: onToggleOutputMute,
                ),
                IconButton(
                  tooltip: l10n.voiceHardMuteLabel,
                  icon: Icon(hardMute ? Icons.mic_off : Icons.mic),
                  isSelected: hardMute,
                  selectedIcon: const Icon(Icons.mic_off),
                  onPressed: onToggleMute,
                ),
              ],
            ),
            const SizedBox(height: 6),
            // Row 2: mode badge
            Row(
              children: [
                Icon(
                  transmitMode == rust.BridgeTransmitMode.ptt
                      ? Icons.radio_button_checked
                      : Icons.podcasts,
                  size: 16,
                  color: theme.colorScheme.onSurfaceVariant,
                ),
                const SizedBox(width: 6),
                Expanded(
                  child: Text(
                    _modeLabel(l10n),
                    style: theme.textTheme.bodyMedium?.copyWith(
                      color: theme.colorScheme.onSurfaceVariant,
                    ),
                  ),
                ),
                TextButton.icon(
                  icon: const Icon(Icons.tune, size: 16),
                  label: Text(l10n.voiceSettingsTitle),
                  onPressed: onConfigure,
                ),
              ],
            ),
            // Row 3: PTT-only secondary line — bound key + release
            // tail. Hidden entirely for Continuous / Voice Activity
            // so the bar stays focused on what's actually in use.
            if (isPtt)
              Padding(
                padding: const EdgeInsets.only(left: 22, top: 2),
                child: Text(
                  '${l10n.voiceModePtt}: '
                  '${pttBoundKeyLabel.isEmpty ? "—" : pttBoundKeyLabel}'
                  '   ·   '
                  '${l10n.voiceReleaseTailLabel}: $releaseTailMs${l10n.voiceReleaseTailHint}',
                  style: theme.textTheme.bodySmall?.copyWith(
                    color: theme.colorScheme.onSurfaceVariant,
                  ),
                ),
              ),
            const SizedBox(height: 6),
            // Row 4: level meter
            _LevelMeter(active: levelActive),
            const SizedBox(height: 4),
            if (stats != null)
              Text(
                l10n.audioStatsLine(
                  stats.framesSent,
                  stats.framesReceived,
                  stats.pttActive ? l10n.voiceMicOn : l10n.voiceMicOff,
                ),
                style: theme.textTheme.bodySmall,
              ),
            const SizedBox(height: 6),
            // PTT capability badge — only relevant when PTT mode is
            // active. Hidden for Continuous / Voice Activity since
            // there's no key binding to surface a capability for.
            // The badge is information-only; the user reaches the
            // bind-key flow through the Voice Bar's settings gear
            // (single configuration entry point — see the comment
            // on `onConfigure`).
            if (isPtt)
              PttCapabilityBadge(
                level: pttLevel,
                backendId: pttBackendId,
                boundInputClass: pttBoundInputClass,
              ),
            // Leave-voice button intentionally absent: TeamSpeak's
            // model is "user is always in some channel", not
            // Discord's join/leave-voice. To stop being heard /
            // hearing others, mute mic and/or speaker via the
            // icons at the top of the bar. To physically move,
            // tap a different channel in the tree below.
          ],
        ),
      ),
    );
  }
}

class _LevelMeter extends StatelessWidget {
  const _LevelMeter({required this.active});

  final bool active;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Container(
      height: 8,
      decoration: BoxDecoration(
        color: theme.colorScheme.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(4),
      ),
      child: FractionallySizedBox(
        alignment: AlignmentDirectional.centerStart,
        widthFactor: active ? 0.75 : 0.05,
        child: Container(
          decoration: BoxDecoration(
            color: active
                ? theme.colorScheme.primary
                : theme.colorScheme.outlineVariant,
            borderRadius: BorderRadius.circular(4),
          ),
        ),
      ),
    );
  }
}