'use client';

import { useTimerStore } from '@/lib/store';
import { getRemainingMs } from '@/lib/timer-engine';
import type { Timer } from '@/lib/timer-engine';
import { getUrgencyConfig } from '@/lib/urgency';
import { formatDuration, formatTime, formatDurationCompact } from '@/lib/format';
import { formatMinutesBefore } from '@/lib/cascade';
import {
  Clock,
  Pause,
  Play,
  X,
  AlarmClock,
  Timer as TimerIcon,
  Coffee,
  Bell,
  BellOff,
  Repeat,
  Link2,
  Tag,
} from 'lucide-react';
import { getTimeReferenceMs } from '@/lib/time-blindness';
import { getSuggestedPrepTime, shouldShowPrepWarning, formatPrepWarning } from '@/lib/prep-time';

interface TimerCardProps {
  timer: Timer;
}

export function TimerCard({ timer }: TimerCardProps) {
  const now = useTimerStore((s) => s.now);
  const { pause, resume, dismiss, snooze, advancePom } = useTimerStore();
  const urgencyConfig = getUrgencyConfig(timer.urgency);
  const remaining = getRemainingMs(timer, now);

  const typeIcon = {
    alarm: <AlarmClock size={16} />,
    countdown: <TimerIcon size={16} />,
    pomodoro: <Coffee size={16} />,
    event: <Clock size={16} />,
  }[timer.type];

  const stateLabel = {
    idle: 'Idle',
    active: 'Active',
    warning: 'Warning',
    firing: 'FIRING!',
    snoozed: 'Snoozed',
    dismissed: 'Dismissed',
    completed: 'Done',
    paused: 'Paused',
  }[timer.state];

  const isFiring = timer.state === 'firing';
  const isPaused = timer.state === 'paused';
  const isActive = ['active', 'warning', 'snoozed'].includes(timer.state);
  const isDone = ['dismissed', 'completed'].includes(timer.state);

  // Pomodoro label
  const pomLabel = timer.pomodoroState
    ? timer.pomodoroState.isBreak || timer.pomodoroState.isLongBreak
      ? `Break`
      : `Round ${timer.pomodoroState.currentRound}/${timer.pomodoroConfig?.rounds ?? 4}`
    : null;

  // Next warning
  const nextWarning = timer.warnings.find((w) => !w.fired);

  return (
    <div
      className={`relative rounded-xl border p-4 transition-all duration-200 ${
        isFiring
          ? 'animate-pulse border-2'
          : 'border'
      }`}
      style={{
        backgroundColor: isFiring ? urgencyConfig.bgColor : 'var(--cm-surface-card)',
        borderColor: isFiring ? urgencyConfig.color : 'var(--cm-border)',
      }}
    >
      {/* Header */}
      <div className="flex items-center justify-between mb-2">
        <div className="flex items-center gap-2">
          <span style={{ color: urgencyConfig.color }}>{typeIcon}</span>
          <span className="text-sm font-medium" style={{ color: 'var(--cm-text-secondary)' }}>
            {timer.type.charAt(0).toUpperCase() + timer.type.slice(1)}
            {pomLabel && ` · ${pomLabel}`}
          </span>
          <span
            className="text-xs px-2 py-0.5 rounded-full font-medium"
            style={{
              backgroundColor: urgencyConfig.bgColor,
              color: urgencyConfig.color,
            }}
          >
            {urgencyConfig.label}
          </span>
          {timer.category && (
            <span
              className="text-xs px-2 py-0.5 rounded-full font-medium flex items-center gap-1"
              style={{ backgroundColor: 'var(--cm-surface-muted)', color: 'var(--cm-text-tertiary)' }}
            >
              <Tag size={10} /> {timer.category}
            </span>
          )}
          {timer.recurringTimerId && (
            <span
              className="text-xs px-1.5 py-0.5 rounded-full flex items-center gap-0.5"
              style={{ backgroundColor: 'var(--cm-accent-secondary-15)', color: 'var(--cm-accent-secondary)' }}
              title="Recurring timer"
            >
              <Repeat size={10} />
            </span>
          )}
          {timer.linkedTimerId && (
            <span
              className="text-xs px-1.5 py-0.5 rounded-full"
              style={{ backgroundColor: 'var(--cm-accent-15)', color: 'var(--cm-accent)' }}
              title="Part of a chain"
            >
              <Link2 size={12} />
            </span>
          )}
        </div>
        <span
          className="text-xs font-mono px-2 py-0.5 rounded"
          style={{
            backgroundColor: isFiring ? urgencyConfig.color : 'var(--cm-surface-muted)',
            color: isFiring ? 'var(--cm-white)' : 'var(--cm-text-tertiary)',
          }}
        >
          {stateLabel}
        </span>
      </div>

      {/* Label */}
      <h3 className="text-lg font-semibold mb-1" style={{ color: 'var(--cm-text-primary)' }}>
        {timer.label}
      </h3>

      {/* Countdown / Time */}
      {!isDone && timer.type === 'event' && (
        <div className="mb-3">
          {/* Large days display for event countdowns */}
          {(() => {
            const days = Math.floor(remaining / 86_400_000);
            const hours = Math.floor((remaining % 86_400_000) / 3_600_000);
            const totalDays = timer.duration ? Math.ceil(timer.duration / 86_400_000) : days;
            const progress = totalDays > 0 ? Math.max(0, Math.min(1, 1 - days / totalDays)) : 0;
            return (
              <>
                <div className="flex items-baseline gap-2">
                  <span
                    className="text-4xl font-mono font-bold tabular-nums tracking-tight"
                    style={{ color: days <= 1 ? urgencyConfig.color : 'var(--cm-accent)' }}
                  >
                    {days}
                  </span>
                  <span className="text-lg font-medium" style={{ color: 'var(--cm-text-secondary)' }}>
                    day{days !== 1 ? 's' : ''}
                  </span>
                  <span className="text-sm" style={{ color: 'var(--cm-text-tertiary)' }}>
                    {hours}h remaining
                  </span>
                </div>
                {/* Milestone progress bar */}
                <div className="mt-2 h-2 rounded-full overflow-hidden" style={{ backgroundColor: 'var(--cm-surface-muted)' }}>
                  <div
                    className="h-full rounded-full transition-all duration-500"
                    style={{
                      width: `${progress * 100}%`,
                      backgroundColor: progress > 0.9 ? 'var(--cm-danger)' : progress > 0.7 ? 'var(--cm-warning)' : 'var(--cm-accent)',
                    }}
                  />
                </div>
                <div className="flex justify-between mt-1">
                  <span className="text-xs" style={{ color: 'var(--cm-text-tertiary)' }}>Created</span>
                  <span className="text-xs" style={{ color: 'var(--cm-text-tertiary)' }}>
                    {new Date(timer.targetTime).toLocaleDateString()}
                  </span>
                </div>
              </>
            );
          })()}
        </div>
      )}
      {!isDone && timer.type !== 'event' && (
        <div className="mb-3">
          <div className="flex items-baseline gap-2">
            <span
              className="text-3xl font-mono font-bold tabular-nums tracking-tight"
              style={{ color: isFiring ? urgencyConfig.color : 'var(--cm-text-primary)' }}
            >
              {formatDuration(remaining)}
            </span>
            <span className="text-sm" style={{ color: 'var(--cm-text-tertiary)' }}>
              fires at {formatTime(timer.targetTime)}
            </span>
          </div>
          {/* Time blindness aid */}
          {remaining > 60_000 && (
            <p className="text-xs mt-1 italic" style={{ color: 'var(--cm-text-tertiary)' }}>
              {getTimeReferenceMs(remaining)}
            </p>
          )}
        </div>
      )}

      {/* Cascade warnings progress */}
      {timer.warnings.length > 0 && !isDone && (
        <div className="flex gap-1 mb-3">
          {timer.warnings.map((w) => (
            <div
              key={w.id}
              className="flex-1 h-1.5 rounded-full transition-colors"
              style={{
                backgroundColor: w.fired ? urgencyConfig.color : 'var(--cm-surface-muted)',
                opacity: w.fired ? 1 : 0.3,
              }}
              title={`${formatMinutesBefore(w.minutesBefore)} before — ${w.fired ? 'fired' : 'pending'}`}
            />
          ))}
        </div>
      )}

      {/* Next warning */}
      {nextWarning && !isDone && !isFiring && (
        <p className="text-xs mb-3 flex items-center gap-1" style={{ color: 'var(--cm-text-tertiary)' }}>
          <Bell size={12} />
          Next warning: {formatMinutesBefore(nextWarning.minutesBefore)} before
        </p>
      )}

      {/* Custom message or prep time warning */}
      {!isDone && !isFiring && timer.customMessage && (
        <p className="text-xs mb-3 flex items-center gap-1 font-medium" style={{ color: 'var(--cm-accent-secondary)' }}>
          💬 {timer.customMessage}
        </p>
      )}
      {!isDone && !isFiring && !timer.customMessage && (() => {
        const prepConfig = getSuggestedPrepTime(timer.label, timer.category);
        const minutesUntil = Math.round(remaining / 60_000);
        if (shouldShowPrepWarning(timer.targetTime, prepConfig, now)) {
          return (
            <p className="text-xs mb-3 flex items-center gap-1 font-medium" style={{ color: 'var(--cm-warning)' }}>
              ⏱ {formatPrepWarning(prepConfig, minutesUntil)}
            </p>
          );
        }
        return null;
      })()}

      {/* Snooze info */}
      {timer.snoozeCount > 0 && (
        <p className="text-xs mb-3 flex items-center gap-1" style={{ color: 'var(--cm-text-tertiary)' }}>
          <BellOff size={12} />
          Snoozed {timer.snoozeCount}x
        </p>
      )}

      {/* Actions */}
      <div className="flex gap-2">
        {isActive && timer.type !== 'alarm' && (
          <button
            onClick={() => pause(timer.id)}
            className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer"
            style={{
              backgroundColor: 'var(--cm-surface-muted)',
              color: 'var(--cm-text-secondary)',
            }}
          >
            <Pause size={14} /> Pause
          </button>
        )}

        {isPaused && (
          <button
            onClick={() => resume(timer.id)}
            className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer"
            style={{
              backgroundColor: 'var(--cm-accent)',
              color: 'var(--cm-white)',
            }}
          >
            <Play size={14} /> Resume
          </button>
        )}

        {isFiring && (
          <>
            <button
              onClick={() => snooze(timer.id, 5)}
              className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer"
              style={{ backgroundColor: 'var(--cm-surface-muted)', color: 'var(--cm-text-secondary)' }}
            >
              5m
            </button>
            <button
              onClick={() => snooze(timer.id, 15)}
              className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer"
              style={{ backgroundColor: 'var(--cm-surface-muted)', color: 'var(--cm-text-secondary)' }}
            >
              15m
            </button>
            {timer.type === 'pomodoro' && (
              <button
                onClick={() => advancePom(timer.id)}
                className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer"
                style={{ backgroundColor: 'var(--cm-accent-secondary)', color: 'var(--cm-black)' }}
              >
                Next
              </button>
            )}
          </>
        )}

        {(isActive || isPaused || isFiring) && (
          <button
            onClick={() => dismiss(timer.id)}
            className="flex items-center gap-1 px-3 py-1.5 rounded-lg text-sm font-medium transition-colors cursor-pointer ml-auto"
            style={{ backgroundColor: 'var(--cm-critical-15)', color: 'var(--cm-danger)' }}
          >
            <X size={14} /> Dismiss
          </button>
        )}
      </div>
    </div>
  );
}