import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

import '../tokens.dart';
import 'buttons.dart';
import 'chrome.dart';

enum DmTagTone {
  /// The default: a quiet sunken chip carrying a fact — "2 Milers nearby".
  neutral,

  /// Outlined crimson. The one tag in a group that is a recommendation
  /// — "Fastest".
  brand,

  /// Kept for the delivered state.
  ok,

  warn,

  /// On a crimson field.
  onFill,
}

/// Small badge: "Fastest pickup", "Transit", "4 Milers nearby".
class DmTag extends StatelessWidget {
  const DmTag(
    this.label, {
    super.key,
    this.tone = DmTagTone.neutral,
    this.icon,
    this.mono = false,
  });

  final String label;
  final DmTagTone tone;
  final IconData? icon;

  /// For a vehicle plate or a reference carried as a tag.
  final bool mono;

  @override
  Widget build(BuildContext context) {
    final (Color bg, Color fg, BoxBorder? edge) = switch (tone) {
      DmTagTone.neutral => (DmColors.surfaceAlt, DmColors.ink2, null),
      DmTagTone.brand => (
          DmColors.surface,
          DmColors.brand,
          Border.all(color: DmColors.brandLine),
        ),
      DmTagTone.ok => (DmColors.okSoft, DmColors.ok, null),
      DmTagTone.warn => (const Color(0xFFFFF3DF), const Color(0xFF9C5303), null),
      DmTagTone.onFill => (DmColors.onBrandRaise, Colors.white, null),
    };

    return Container(
      padding: EdgeInsets.fromLTRB(icon == null ? 10 : 8, 5, 10, 5),
      decoration: BoxDecoration(
        color: bg,
        border: edge,
        borderRadius: DmRadius.all(5),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          if (icon != null) ...[
            Icon(icon, size: 13, color: fg),
            const SizedBox(width: 5),
          ],
          Flexible(
            child: Text(
              label,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: mono
                  ? DmText.monoSm.copyWith(fontSize: 12, color: fg)
                  : DmText.label.copyWith(fontSize: 12, color: fg),
            ),
          ),
        ],
      ),
    );
  }
}

/// A selection chip — the design's `.filt`.
///
/// This is the app's one selection control: it is the sign-in method switch,
/// the address label picker, the slot day filter and the rating tags. Selected
/// is a filled crimson chip with a small glow; unselected is a white chip with
/// a hairline. There is no third state to learn.
class DmChoiceChip extends StatelessWidget {
  const DmChoiceChip({
    super.key,
    required this.label,
    required this.selected,
    this.enabled = true,
    this.onTap,
    this.count,
    this.expand = false,
  });

  final String label;
  final bool selected;
  final bool enabled;
  final VoidCallback? onTap;

  /// A figure carried inside the chip, as on the Orders filters.
  final int? count;

  /// Fills the available width — for a row of chips that splits evenly.
  final bool expand;

  @override
  Widget build(BuildContext context) {
    // ── A segmented control, not a crimson block ──
    //
    // "Today" was a solid brand fill with [DmShadow.liftSm] under it, sitting
    // eight points above a list of windows and two hundred above the crimson
    // button that confirms one. Three crimson objects on a sheet that asks a
    // single question, and the loudest of them was the day — which the
    // customer changes once, if ever.
    //
    // It is a lifted white chip on a sunken track now: the same convention
    // iOS and every banking app use for a segment, where *selected* means
    // raised rather than coloured.
    final fg = selected ? DmColors.ink : (enabled ? DmColors.ink3 : DmColors.ink4);

    final chip = AnimatedContainer(
      duration: DmMotion.base,
      curve: DmMotion.ease,
      constraints: const BoxConstraints(minHeight: 40),
      // 9, not 12. Three of these split a 390pt phone between them on the
      // Orders filter, and at 12 the widest label truncated to "Cancell…".
      // The pickup window's day switcher has two chips and acres of room, so
      // it loses nothing.
      padding: const EdgeInsets.symmetric(horizontal: 9, vertical: 9),
      alignment: Alignment.center,
      decoration: BoxDecoration(
        color: selected ? DmColors.surface : Colors.transparent,
        borderRadius: DmRadius.all(DmRadius.sm),
        boxShadow: selected ? DmShadow.card : null,
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Flexible(
            child: Text(
              label,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: DmText.label.copyWith(
                fontSize: 13.5,
                color: fg,
                fontWeight: selected ? FontWeight.w700 : FontWeight.w600,
              ),
            ),
          ),
          if (count != null) ...[
            const SizedBox(width: 5),
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
              decoration: BoxDecoration(
                color: selected ? DmColors.surfaceAlt : DmColors.surface,
                borderRadius: DmRadius.all(DmRadius.pill),
              ),
              child: Text(
                '$count',
                style: DmText.monoSm.copyWith(
                  fontSize: 11,
                  color: DmColors.ink3,
                ),
              ),
            ),
          ],
        ],
      ),
    );

    final tappable = Semantics(
      button: true,
      selected: selected,
      enabled: enabled,
      child: GestureDetector(
        behavior: HitTestBehavior.opaque,
        onTap: enabled
            ? () {
                HapticFeedback.selectionClick();
                onTap?.call();
              }
            : null,
        child: chip,
      ),
    );

    return expand ? Expanded(child: tappable) : tappable;
  }
}

/// A destination card in a horizontal strip — the design's `.ccard`.
///
/// Selection is a wash and a crimson edge rather than a fill: a strip of these
/// is scanned, and a solid crimson block in a scrollable row pulls the eye off
/// the neighbours the customer is still comparing.
class DmGridTile extends StatelessWidget {
  const DmGridTile({
    super.key,
    required this.label,
    required this.selected,
    this.enabled = true,
    this.note,
    this.onTap,
    this.icon,
  });

  final String label;
  final bool selected;
  final bool enabled;
  final String? note;
  final VoidCallback? onTap;
  final IconData? icon;

  @override
  Widget build(BuildContext context) {
    final titleColor = enabled
        ? (selected ? DmColors.brand : DmColors.ink)
        : DmColors.ink4;
    final noteColor = selected
        ? DmColors.brandPress
        : (enabled ? DmColors.ink3 : DmColors.ink4);

    return Semantics(
      button: true,
      selected: selected,
      enabled: enabled,
      child: GestureDetector(
        behavior: HitTestBehavior.opaque,
        onTap: enabled
            ? () {
                HapticFeedback.selectionClick();
                onTap?.call();
              }
            : null,
        child: AnimatedContainer(
          duration: DmMotion.base,
          curve: DmMotion.ease,
          padding: const EdgeInsets.fromLTRB(13, 12, 13, 12),
          decoration: BoxDecoration(
            color: selected
                ? DmColors.brandSoft
                : (enabled ? DmColors.surface : DmColors.surfaceAlt),
            border: Border.all(
              color: selected ? DmColors.brand : DmColors.border,
            ),
            borderRadius: DmRadius.all(DmRadius.md),
          ),
          child: Row(
            children: [
              if (icon != null) ...[
                Icon(
                  icon,
                  size: 18,
                  color: selected ? DmColors.brand : DmColors.ink3,
                ),
                const SizedBox(width: 10),
              ],
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(
                      label,
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                      style: DmText.cardTitle.copyWith(color: titleColor),
                    ),
                    if (note != null) ...[
                      const SizedBox(height: 2),
                      Text(
                        // Secondary: the promise may ellipsize, the place name
                        // never does.
                        note!,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: DmText.tiny.copyWith(fontSize: 11.5, color: noteColor),
                      ),
                    ],
                  ],
                ),
              ),
              if (selected)
                const Padding(
                  padding: EdgeInsets.only(left: 6),
                  child: Icon(LucideIcons.check, size: 17, color: DmColors.brand),
                ),
            ],
          ),
        ),
      ),
    );
  }
}

/// "Step 2 of 4 · Pickup" with its segmented rail.
class DmStepHeader extends StatelessWidget {
  const DmStepHeader({
    super.key,
    required this.step,
    required this.total,
    required this.label,
  });

  final int step;
  final int total;
  final String label;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(DmSpace.pad, 0, DmSpace.pad, 16),
      child: DmStepBar(
        progress: step / total,
        steps: total,
        current: step,
        label: label,
      ),
    );
  }
}

/// A washed strip carrying one piece of supporting information.
class DmInfoBanner extends StatelessWidget {
  const DmInfoBanner({
    super.key,
    required this.icon,
    required this.title,
    this.message,
    this.tone = DmTagTone.brand,
  });

  final IconData icon;
  final String title;
  final String? message;
  final DmTagTone tone;

  @override
  Widget build(BuildContext context) {
    final (bg, edge, fg, sub) = switch (tone) {
      DmTagTone.ok => (DmColors.okSoft, DmColors.okSoft, DmColors.ok, DmColors.ok),
      DmTagTone.warn => (
          const Color(0xFFFFF3DF),
          const Color(0xFFF6E3C2),
          const Color(0xFF9C5303),
          const Color(0xFF9C5303),
        ),
      DmTagTone.neutral => (
          DmColors.surfaceAlt,
          DmColors.border,
          DmColors.ink,
          DmColors.ink2,
        ),
      _ => (
          DmColors.brandSoft,
          DmColors.brandLine,
          DmColors.ink,
          DmColors.brandPress,
        ),
    };

    return Container(
      padding: const EdgeInsets.fromLTRB(13, 13, 14, 13),
      decoration: BoxDecoration(
        color: bg,
        border: Border.all(color: edge),
        borderRadius: DmRadius.all(DmRadius.md),
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            width: 38,
            height: 38,
            alignment: Alignment.center,
            decoration: BoxDecoration(
              color: tone == DmTagTone.brand ? DmColors.brandSoft : Colors.transparent,
              borderRadius: DmRadius.all(DmRadius.xs),
            ),
            child: Icon(
              icon,
              size: 18,
              color: tone == DmTagTone.brand ? DmColors.brand : fg,
            ),
          ),
          const SizedBox(width: 11),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(title, style: DmText.cardTitle.copyWith(fontSize: 14, color: fg)),
                if (message != null) ...[
                  const SizedBox(height: 2),
                  Text(message!, style: DmText.small.copyWith(color: sub)),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }
}

/// A reference number with a copy affordance. The number is mono and large
/// enough to read back over a phone.
class DmCopyRow extends StatefulWidget {
  const DmCopyRow({
    super.key,
    required this.label,
    required this.value,
    this.trailing,
    this.onWash = false,
  });

  final String label;
  final String value;
  final Widget? trailing;

  /// Sitting inside a wash card, where the label goes crimson.
  final bool onWash;

  @override
  State<DmCopyRow> createState() => _DmCopyRowState();
}

class _DmCopyRowState extends State<DmCopyRow> {
  bool _copied = false;

  Future<void> _copy() async {
    await Clipboard.setData(ClipboardData(text: widget.value));
    await HapticFeedback.mediumImpact();
    if (!mounted) return;
    // The confirmation lands on the control that was pressed rather than in a
    // snackbar over the footer: it is the row the customer is looking at.
    setState(() => _copied = true);
    await Future<void>.delayed(const Duration(milliseconds: 1600));
    if (mounted) setState(() => _copied = false);
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                widget.label.toUpperCase(),
                style: DmText.eyebrow.copyWith(
                  color: widget.onWash ? DmColors.brand : DmColors.ink3,
                ),
              ),
              const SizedBox(height: 4),
              Text(
                widget.value,
                style: DmText.monoLg.copyWith(
                  color: widget.onWash ? DmColors.brandPress : DmColors.ink,
                ),
              ),
            ],
          ),
        ),
        ?widget.trailing,
        DmTextAction(
          label: _copied ? 'Copied' : 'Copy',
          icon: _copied ? LucideIcons.check : LucideIcons.copy,
          onPressed: _copy,
        ),
      ],
    );
  }
}

/// − n + quantity control. Used for how many packages go to one place.
class DmStepper extends StatelessWidget {
  const DmStepper({
    super.key,
    required this.value,
    required this.onChanged,
    this.min = 1,
    this.canIncrease = true,
  });

  final int value;
  final ValueChanged<int> onChanged;
  final int min;

  /// False when a cap has been reached; the + greys out rather than vanishing.
  final bool canIncrease;

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: DmColors.surface,
        border: Border.all(color: DmColors.border),
        borderRadius: DmRadius.all(DmRadius.sm),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          _Step(
            icon: LucideIcons.minus,
            onTap: value > min ? () => onChanged(value - 1) : null,
          ),
          ConstrainedBox(
            constraints: const BoxConstraints(minWidth: 30),
            child: Text(
              '$value',
              textAlign: TextAlign.center,
              style: DmText.monoLg.copyWith(fontSize: 17),
            ),
          ),
          _Step(
            icon: LucideIcons.plus,
            onTap: canIncrease ? () => onChanged(value + 1) : null,
          ),
        ],
      ),
    );
  }
}

class _Step extends StatelessWidget {
  const _Step({required this.icon, this.onTap});

  final IconData icon;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    final enabled = onTap != null;
    return Semantics(
      button: true,
      enabled: enabled,
      child: InkResponse(
        onTap: enabled
            ? () {
                HapticFeedback.selectionClick();
                onTap!();
              }
            : null,
        radius: 20,
        child: SizedBox(
          width: 44,
          height: 44,
          child: Icon(
            icon,
            size: 18,
            color: enabled ? DmColors.ink : DmColors.ink4,
          ),
        ),
      ),
    );
  }
}