import 'package:flutter/material.dart';

import '../../core/i18n/app_locale.dart';
import '../../core/theme/tokens.dart';

/// 회원가입 약관 — Figma `179:24230`(미동의) · `179:24324`(전체 동의).
///
/// 필수 3항(서비스 · 위치기반 · 만 14세)을 모두 체크해야 「완료」가 켜진다. 완료하면 `true` 를
/// 돌려주고, 부른 쪽([SimpleLoginScreen] 가입 모드)이 제공자 인증으로 넘어간다.
///
/// 약관 본문은 시안의 자리 표시 문구다. 확정 약관이 오면 [_body] 만 바꾼다.
class TermsScreen extends StatefulWidget {
  const TermsScreen({super.key});

  @override
  State<TermsScreen> createState() => _TermsScreenState();
}

enum _Term {
  service(required: true, body: true),
  location(required: true, body: true),
  age(required: true, body: false),
  marketing(required: false, body: true);

  const _Term({required this.required, required this.body});

  final bool required;
  final bool body;

  String label(AppLocalizations l10n) => switch (this) {
    service => l10n.termsService,
    location => l10n.termsLocation,
    age => l10n.termsAge,
    marketing => l10n.termsMarketing,
  };
}

const _body =
    'FANUZU 서비스 이용약관\n\n제1조 (적용범위)\n서비스 이용약관에 대한 더미 텍스트 입니다.\n'
    '추후 작성해주시기 바랍니다. 서비스 이용약관에 대한 더미 텍스트 입니다.';

const _stroke = Color(0xFF545454);

class _TermsScreenState extends State<TermsScreen> {
  final _agreed = <_Term>{};

  bool get _all => _agreed.length == _Term.values.length;
  bool get _ready =>
      _Term.values.where((t) => t.required).every(_agreed.contains);

  void _toggle(_Term t) =>
      setState(() => _agreed.contains(t) ? _agreed.remove(t) : _agreed.add(t));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(context.l10n.termsTitle)),
      body: ListView(
        padding: const EdgeInsets.all(AppSpace.s4),
        children: [
          _Box(
            child: _CheckRow(
              label: context.l10n.termsAgreeAll,
              checked: _all,
              size: 16,
              onTap: () => setState(
                () => _all ? _agreed.clear() : _agreed.addAll(_Term.values),
              ),
            ),
          ),
          for (final t in _Term.values) ...[
            const SizedBox(height: AppSpace.s3),
            _Box(
              child: t.body
                  ? Column(
                      crossAxisAlignment: CrossAxisAlignment.stretch,
                      children: [
                        Container(
                          // 시안 획은 안쪽이다 — decoration 이면 획 두께만큼 높이가 는다.
                          foregroundDecoration: const BoxDecoration(
                            border: Border(bottom: BorderSide(color: _stroke)),
                          ),
                          child: _CheckRow(
                            label: t.label(context.l10n),
                            checked: _agreed.contains(t),
                            onTap: () => _toggle(t),
                          ),
                        ),
                        const Padding(
                          padding: EdgeInsets.symmetric(vertical: AppSpace.s4),
                          child: SizedBox(
                            height: 80,
                            child: ClipRect(
                              child: Text(
                                _body,
                                overflow: TextOverflow.clip,
                                style: TextStyle(
                                  fontFamily: AppFonts.display,
                                  fontFamilyFallback: [AppFonts.body],
                                  fontSize: 12,
                                  height: 1.36,
                                  letterSpacing: -0.3,
                                  color: AppColors.onCosmic,
                                ),
                              ),
                            ),
                          ),
                        ),
                      ],
                    )
                  : _CheckRow(
                      label: t.label(context.l10n),
                      checked: _agreed.contains(t),
                      onTap: () => _toggle(t),
                    ),
            ),
          ],
          const SizedBox(height: AppSpace.s6),
          Row(
            children: [
              Expanded(
                child: FilledButton(
                  onPressed: () => Navigator.of(context).pop(false),
                  style: FilledButton.styleFrom(
                    backgroundColor: Colors.black,
                    foregroundColor: AppColors.onCosmic,
                  ),
                  child: Text(context.l10n.commonPrev),
                ),
              ),
              const SizedBox(width: 10),
              Expanded(
                child: FilledButton(
                  onPressed: _ready
                      ? () => Navigator.of(context).pop(true)
                      : null,
                  style: FilledButton.styleFrom(
                    backgroundColor: AppColors.cosmicAccent,
                    foregroundColor: AppColors.onCosmicAccent,
                    disabledBackgroundColor: const Color(0xFF333333),
                    disabledForegroundColor: const Color(0xFF777777),
                  ),
                  child: Text(context.l10n.commonDone),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

/// 약관 칸 — #545454 획 · 모서리 8 · 좌우 16.
class _Box extends StatelessWidget {
  const _Box({required this.child});

  final Widget child;

  @override
  Widget build(BuildContext context) => Container(
    padding: const EdgeInsets.symmetric(horizontal: AppSpace.s4),
    foregroundDecoration: BoxDecoration(
      border: Border.all(color: _stroke),
      borderRadius: BorderRadius.circular(AppRadius.sm),
    ),
    child: child,
  );
}

/// 체크 행 — circle-check 20 · 간격 16 · ABeeZee. 미동의는 #767676, 동의는 핑크.
class _CheckRow extends StatelessWidget {
  const _CheckRow({
    required this.label,
    required this.checked,
    required this.onTap,
    this.size = 14,
  });

  final String label;
  final bool checked;
  final VoidCallback onTap;
  final double size;

  @override
  Widget build(BuildContext context) => InkWell(
    onTap: onTap,
    child: Padding(
      padding: const EdgeInsets.symmetric(vertical: AppSpace.s4),
      child: Row(
        children: [
          ImageIcon(
            const AssetImage('assets/icons/circle_check.png'),
            size: 20,
            color: checked ? AppColors.cosmicAccent : AppColors.onCosmicMuted,
          ),
          const SizedBox(width: AppSpace.s4),
          Expanded(
            child: Text(
              label,
              style: TextStyle(
                fontFamily: AppFonts.display,
                fontFamilyFallback: const [AppFonts.body],
                fontSize: size,
                height: size == 16 ? 24 / 16 : 20 / 14,
                color: AppColors.onCosmic,
              ),
            ),
          ),
        ],
      ),
    ),
  );
}

/// 회원가입 완료 — Figma `182:29344`. 가입 직후 라우터 redirect 가 한 번 띄우고
/// ([AuthRepository.justSignedUp]), 「시작」은 [onStart] 로 셸에 들어간다.
class SignupCompleteScreen extends StatelessWidget {
  const SignupCompleteScreen({super.key, this.onStart});

  final VoidCallback? onStart;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Expanded(
              child: Center(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Padding(
                      padding: EdgeInsets.all(20),
                      child: SizedBox.square(
                        dimension: 120,
                        child: DecoratedBox(
                          decoration: BoxDecoration(
                            color: AppColors.cosmicAccent,
                            shape: BoxShape.circle,
                          ),
                        ),
                      ),
                    ),
                    const SizedBox(height: AppSpace.s6),
                    Text(
                      context.l10n.signupDoneTitle,
                      style: TextStyle(
                        fontFamily: AppFonts.body,
                        fontSize: 24,
                        fontWeight: FontWeight.w600,
                        height: 1,
                        color: AppColors.onCosmic,
                      ),
                    ),
                    const SizedBox(height: AppSpace.s3),
                    Text(
                      context.l10n.signupDoneBody,
                      textAlign: TextAlign.center,
                      style: TextStyle(
                        fontFamily: AppFonts.display,
                        fontFamilyFallback: const [AppFonts.body],
                        fontSize: 14,
                        height: 24 / 14,
                        color: const Color(0xFFCDCDCD),
                      ),
                    ),
                  ],
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: AppSpace.s4),
              child: FilledButton(
                onPressed: onStart ?? () => Navigator.of(context).maybePop(),
                style: FilledButton.styleFrom(
                  backgroundColor: AppColors.cosmicAccent,
                  foregroundColor: AppColors.onCosmicAccent,
                ),
                child: Text(context.l10n.commonStart),
              ),
            ),
          ],
        ),
      ),
    );
  }
}