import 'package:flutter/material.dart';

import '../../../fly/fly_prefs.dart';
import '../../../fly/modes/intelligent_modes.dart';
import '../../../fly/product_profile.dart';
import '../../../theme.dart';
import '../../pv_icons.dart';
import '../hud_kit.dart';

/// The Intelligent Flight Modes picker (plan P7): a grid of the connected
/// product's modes, grouped as GO 4 does. Resolves to the chosen mode once
/// its first-use terms are accepted, or null.
Future<IntelligentMode?> showModePicker(BuildContext context, {required ProductProfile profile}) async {
  final IntelligentMode? picked = await showGeneralDialog<IntelligentMode>(
    context: context,
    barrierDismissible: true,
    barrierLabel: 'Intelligent Flight Modes',
    barrierColor: const Color(0x88050A14),
    transitionDuration: const Duration(milliseconds: 180),
    pageBuilder: (BuildContext context, _, __) => Center(child: ModePickerPanel(profile: profile)),
    transitionBuilder: (BuildContext context, Animation<double> a, _, Widget child) => FadeTransition(
      opacity: a,
      child: ScaleTransition(scale: Tween<double>(begin: 0.96, end: 1).animate(a), child: child),
    ),
  );
  if (picked == null || !context.mounted) return null;
  final bool ok = await ensureModeTerms(context, ModeCatalog.of(picked));
  return ok ? picked : null;
}

/// Shows the mode's terms the first time it is used; true once accepted.
Future<bool> ensureModeTerms(BuildContext context, ModeInfo info) async {
  if (FlyPrefs.acceptedModeTerms.value.contains(info.mode.name)) return true;
  final bool? agreed = await showDialog<bool>(
    context: context,
    barrierColor: const Color(0x99050A14),
    builder: (BuildContext context) => ModeTermsDialog(info: info),
  );
  if (agreed != true) return false;
  await FlyPrefs.acceptModeTerms(info.mode.name);
  return true;
}

class ModePickerPanel extends StatelessWidget {
  const ModePickerPanel({super.key, required this.profile});

  final ProductProfile profile;

  @override
  Widget build(BuildContext context) {
    final List<ModeInfo> modes = ModeCatalog.forProfile(profile);
    final Size screen = MediaQuery.sizeOf(context);
    return Material(
      color: const Color(0xF20B1426),
      borderRadius: BorderRadius.circular(16),
      clipBehavior: Clip.antiAlias,
      child: ConstrainedBox(
        constraints: BoxConstraints(maxWidth: 620, maxHeight: screen.height - 32),
        child: Column(mainAxisSize: MainAxisSize.min, crossAxisAlignment: CrossAxisAlignment.stretch, children: <Widget>[
          Padding(
            padding: const EdgeInsets.fromLTRB(18, 10, 6, 6),
            child: Row(children: <Widget>[
              const PVIcon('master', size: 16, color: Glass.ink),
              const SizedBox(width: 8),
              Expanded(child: Text('Intelligent Flight Modes', style: HudText.sans.copyWith(fontSize: 14, fontWeight: FontWeight.w700))),
              IconButton(
                key: const ValueKey<String>('mode-picker-close'),
                onPressed: () => Navigator.of(context).pop(),
                icon: const PVIcon('close', size: 18, color: HudText.dim),
              ),
            ]),
          ),
          const Divider(height: 1, color: Glass.hairline),
          Flexible(
            child: modes.isEmpty
                ? Padding(
                    padding: const EdgeInsets.all(24),
                    child: Text('This aircraft offers no intelligent flight modes through the SDK.',
                        style: HudText.sans.copyWith(color: HudText.dim, fontWeight: FontWeight.w400)),
                  )
                : ListView(
                    shrinkWrap: true,
                    padding: const EdgeInsets.fromLTRB(16, 10, 16, 16),
                    children: <Widget>[
                      for (final String g in ModeCatalog.groups)
                        if (modes.any((ModeInfo m) => m.group == g)) ...<Widget>[
                          Padding(
                            padding: const EdgeInsets.only(top: 6, bottom: 8),
                            child: Text(g.toUpperCase(), style: HudText.label),
                          ),
                          Wrap(spacing: 10, runSpacing: 10, children: <Widget>[
                            for (final ModeInfo m in modes)
                              if (m.group == g) _ModeTile(info: m),
                          ]),
                        ],
                    ],
                  ),
          ),
        ]),
      ),
    );
  }
}

class _ModeTile extends StatelessWidget {
  const _ModeTile({required this.info});

  final ModeInfo info;

  @override
  Widget build(BuildContext context) {
    final bool on = info.built;
    return GestureDetector(
      key: ValueKey<String>('mode-${info.mode.name}'),
      behavior: HitTestBehavior.opaque,
      onTap: on ? () => Navigator.of(context).pop(info.mode) : null,
      child: Opacity(
        opacity: on ? 1 : 0.5,
        child: Container(
          width: 136,
          height: 92,
          padding: const EdgeInsets.all(10),
          decoration: BoxDecoration(
            color: on ? const Color(0x263D7BF0) : const Color(0x14FFFFFF),
            borderRadius: BorderRadius.circular(12),
            border: Border.all(color: on ? const Color(0x663D7BF0) : Glass.hairline),
          ),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[
            Row(children: <Widget>[
              PVIcon(info.icon, size: 18, color: Glass.ink),
              const Spacer(),
              if (!on) Text('SOON', style: HudText.label.copyWith(fontSize: 7.5)),
            ]),
            const SizedBox(height: 6),
            Text(info.label, style: HudText.sans.copyWith(fontSize: 12.5, fontWeight: FontWeight.w700)),
            const SizedBox(height: 3),
            Expanded(
              child: Text(info.blurb,
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                  style: HudText.sans.copyWith(fontSize: 10, fontWeight: FontWeight.w400, color: HudText.dim)),
            ),
          ]),
        ),
      ),
    );
  }
}

/// GO 4's "Intelligent Flight Mode Terms": Agree / Disagree, once per mode.
class ModeTermsDialog extends StatelessWidget {
  const ModeTermsDialog({super.key, required this.info});

  final ModeInfo info;

  @override
  Widget build(BuildContext context) {
    return Dialog(
      backgroundColor: const Color(0xF20B1426),
      insetPadding: const EdgeInsets.symmetric(horizontal: 40, vertical: 16),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 480),
        child: Padding(
          padding: const EdgeInsets.fromLTRB(20, 16, 20, 12),
          child: Column(mainAxisSize: MainAxisSize.min, crossAxisAlignment: CrossAxisAlignment.stretch, children: <Widget>[
            Row(children: <Widget>[
              PVIcon(info.icon, size: 18, color: Glass.ink),
              const SizedBox(width: 8),
              Expanded(
                  child: Text('${info.label}: before you fly', style: HudText.sans.copyWith(fontSize: 14, fontWeight: FontWeight.w700))),
            ]),
            const SizedBox(height: 10),
            Flexible(
              child: SingleChildScrollView(
                child: Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: <Widget>[
                  for (final String t in info.terms)
                    Padding(
                      padding: const EdgeInsets.only(bottom: 8),
                      child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[
                        Container(
                          width: 5,
                          height: 5,
                          margin: const EdgeInsets.only(top: 5),
                          decoration: const BoxDecoration(color: HudText.dim, shape: BoxShape.circle),
                        ),
                        const SizedBox(width: 8),
                        Expanded(child: Text(t, style: HudText.sans.copyWith(fontSize: 11.5, fontWeight: FontWeight.w400, height: 1.35))),
                      ]),
                    ),
                ]),
              ),
            ),
            const SizedBox(height: 6),
            Row(mainAxisAlignment: MainAxisAlignment.end, children: <Widget>[
              TextButton(
                key: const ValueKey<String>('terms-disagree'),
                onPressed: () => Navigator.of(context).pop(false),
                child: Text('Disagree', style: HudText.sans.copyWith(color: HudText.dim)),
              ),
              const SizedBox(width: 8),
              FilledButton(
                key: const ValueKey<String>('terms-agree'),
                style: FilledButton.styleFrom(backgroundColor: PV.accent),
                onPressed: () => Navigator.of(context).pop(true),
                child: Text('Agree', style: HudText.sans.copyWith(color: Colors.white)),
              ),
            ]),
          ]),
        ),
      ),
    );
  }
}