import "package:flutter/widgets.dart" hide Tooltip;
import "package:google_fonts/google_fonts.dart";
import "package:shadcn_flutter/shadcn_flutter.dart" hide Row, Expanded;

import "package:provider/provider.dart";
import "../../providers/chat_provider.dart";
import "../../providers/cost_provider.dart";
import "../../providers/settings_provider.dart";
import "ana_text.dart";



String _fmtTokens(int n) {
  final s = n.toString();
  final buf = StringBuffer();
  for (var i = 0; i < s.length; i++) {
    if (i > 0 && (s.length - i) % 3 == 0) buf.write(",");
    buf.write(s[i]);
  }
  return buf.toString();
}


class FooterBar extends StatelessWidget {
  const FooterBar({super.key});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final mutedFg = theme.colorScheme.mutedForeground;
    final borderColor = theme.colorScheme.border;
    final bg = theme.colorScheme.background;

    final costProvider = context.watch<CostProvider>();
    final settingsProvider = context.watch<SettingsProvider>();
    final chatProvider = context.watch<ChatProvider>();

    final model = settingsProvider.settings.model ?? "unknown";
    final costUsd = costProvider.getTotalCostUsd();
    final cost = "\$${costUsd.toStringAsFixed(4)}";
    final inputToks = costProvider.getTotalInputTokens();
    final outputToks = costProvider.getTotalOutputTokens();
    final isLoading = chatProvider.isLoading;
    final isCompacting = chatProvider.isCompacting;
    final contextTokens = chatProvider.contextTokens;
    final warningState = chatProvider.tokenWarningState;

    final textStyle = GoogleFonts.ibmPlexMono(
      fontSize: 11,
      height: 1,
      fontWeight: FontWeight.w600,
      color: mutedFg,
    );

    Widget divider() => const Padding(
      padding: EdgeInsets.symmetric(horizontal: 5),
      child: SizedBox(height: 12, child: VerticalDivider(width: 1)),
    );

    Widget copyrightBlock() {
      return AnaText(
        "© 2026 IMBENJI.NET LTD - The Agency",
        style: textStyle,
      );
    }

    Widget statusBlock() {
      final label = isCompacting
          ? "compacting..."
          : isLoading
              ? "running..."
              : "idle";

      final labelColor = isCompacting
          ? theme.colorScheme.primary.withAlpha(180)
          : isLoading
              ? theme.colorScheme.primary
              : mutedFg;

      return Row(
        mainAxisSize: MainAxisSize.min,
        children: [

          AnaText(label, style: textStyle.copyWith(color: labelColor)),

          divider(),

          AnaText(model.split("/").last, style: textStyle),

        ],
      );
    }

    Color? _contextWarningColor() {
      if (warningState == null) return null;
      if (warningState.isAboveErrorThreshold) return const Color(0xFFEF4444); // red
      if (warningState.isAboveWarningThreshold) return const Color(0xFFF59E0B); // amber
      return null;
    }

    Widget statsBlock() {
      final warnColor = _contextWarningColor();

      return Row(
        mainAxisSize: MainAxisSize.min,
        children: [

          // compact button — shown when we're near the threshold
          if (warningState != null && warningState.isAboveWarningThreshold && !isLoading && !isCompacting) ...[
            GestureDetector(
              onTap: () => chatProvider.runCompact(),
              child: MouseRegion(
                cursor: SystemMouseCursors.click,
                child: AnaText(
                  "compact",
                  style: textStyle.copyWith(
                    color: warnColor ?? mutedFg,
                    decoration: TextDecoration.underline,
                    decorationColor: warnColor ?? mutedFg,
                  ),
                ),
              ),
            ),
            divider(),
          ],

          if (contextTokens > 0) ...[
            Tooltip(
              tooltip: (_) => TooltipContainer(
                padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
                child: AnaText(
                  warningState != null
                      ? "${warningState.percentLeft}% context remaining"
                      : _fmtTokens(contextTokens),
                  style: GoogleFonts.ibmPlexMono(fontSize: 11, height: 1.2),
                ),
              ),
              child: AnaText(
                _fmtTokens(contextTokens),
                style: textStyle.copyWith(color: warnColor ?? mutedFg),
              ),
            ),
            AnaText(" tokens", style: textStyle.copyWith(color: warnColor ?? mutedFg)),
            divider(),
          ],

          Tooltip(
            tooltip: (_) => TooltipContainer(
              padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
              child: AnaText(
                "In: $inputToks\nOut: $outputToks",
                style: GoogleFonts.ibmPlexMono(fontSize: 11, height: 1.2),
              ),
            ),
            child: AnaText(cost, style: textStyle),
          ),

        ],
      );
    }

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      width: double.infinity,
      decoration: BoxDecoration(
        color: bg,
        border: Border(top: BorderSide(color: borderColor, width: 1)),
      ),
      child: Row(
        children: [

          Expanded(child: Row(children: [copyrightBlock()])),

          Expanded(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [statusBlock()],
            ),
          ),

          Expanded(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [statsBlock()],
            ),
          ),

        ],
      ),
    );
  }
}