'use client';

import { useEffect, useState } from 'react';
import PlayerAvatar from '@/components/vyndr/PlayerAvatar';
import GradeBadge from '@/components/vyndr/GradeBadge';
import ArchetypeBadge from '@/components/vyndr/ArchetypeBadge';
import { type Tier } from '@/lib/tierGate';

/**
 * StreaksPanel (Session 23 · rebuilt DS4 — the STREAKS BILLBOARD).
 *
 * DESIGN-SPEC Part 7 (#2): the STREAKS row is a P0 billboard — the timeline
 * is customer #1. Not a log line: a Bloomberg alert. ONE bold figure (the
 * streak LENGTH, mono + tabular, the largest thing in the row) among muted
 * context (real player identity + "built vs" lens), with a SINGLE severity
 * accent — tonight's matchup difficulty (step-up amber / step-down green).
 * The grade badge is tier-gated (the READ is the paid layer).
 *
 * Self-hides when there are no streaks so the landing page never shows an
 * empty box — the other layers (schedule, game lines, props) carry the
 * slate when no logs are warm yet.
 */

interface Streak {
  player: string;
  playerId: string | number | null;
  team: string | null;
  type: string;
  category: string;
  currentStreak: number;
  description: string;
  // Session 60 (night2/C) — THE LENS + optional snapshot grade letter.
  lens?: { builtVs?: string[] | null; matchup?: string | null; difficulty?: string | null; read?: string | null };
  grade?: string | null;
  // DS5 (Part 5) — the player's locked archetype from the snapshot join, when
  // present. Optional + self-hiding: absent beats fabricated.
  archetype?: string | null;
}

export interface StreaksPanelProps {
  sport: string;
  tier?: Tier;
  stat?: string;
  /** Optional hard cap (teaser usage on the landing page). */
  limit?: number;
}

export default function StreaksPanel({ sport, tier = 'free', stat = 'all', limit }: StreaksPanelProps) {
  const [streaks, setStreaks] = useState<Streak[] | null>(null);

  useEffect(() => {
    let cancelled = false;
    async function load() {
      try {
        const res = await fetch(`/api/streaks/${sport}?stat=${encodeURIComponent(stat)}`);
        if (!res.ok) { if (!cancelled) setStreaks([]); return; }
        const data = await res.json();
        if (!cancelled) setStreaks(Array.isArray(data?.streaks) ? data.streaks : []);
      } catch {
        if (!cancelled) setStreaks([]);
      }
    }
    load();
    return () => { cancelled = true; };
  }, [sport, stat]);

  if (!streaks || streaks.length === 0) return null;

  // Session 60 (product def) — the PICTURE is free: every streak shows for
  // every tier. Only an explicit `limit` (landing teaser) caps the list.
  const visible = limit && limit > 0 ? streaks.slice(0, limit) : streaks;
  const hidden = streaks.length - visible.length;
  // DS4 — the GRADE (the READ) is the paid layer; only analyst/desk see it.
  const canSeeGrade = tier === 'analyst' || tier === 'desk';

  return (
    <section className="streaks-panel" style={{ margin: '16px 0' }}>
      <h3 style={panelHeading}>🔥 STREAKS</h3>
      <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
        {visible.map((s) => {
          const diff = s.lens?.difficulty;
          // ONE severity accent — tonight's matchup difficulty.
          const sev = diff === 'step up'
            ? { color: 'var(--amber, #FFB347)', label: '▲ STEP-UP SPOT TONIGHT' }
            : diff === 'step down'
              ? { color: 'var(--g-a, #00D4A0)', label: '▼ SOFTER SPOT TONIGHT' }
              : null;
          // The LENS — muted "built vs" context; never the raw streak alone.
          const builtVs = Array.isArray(s.lens?.builtVs) && s.lens!.builtVs!.length > 0
            ? `built vs ${s.lens!.builtVs!.slice(0, 3).join(', ')}`
            : (s.lens?.read || s.description);
          return (
            <div key={`${s.player}-${s.type}`} style={rowStyle}>
              {/* Real identity — headshot / team-colored monogram (DS0). */}
              <PlayerAvatar name={s.player} sport={sport} playerId={s.playerId} team={s.team} size={46} />

              {/* THE HERO — streak length, mono + tabular, the largest figure
                  in the row. One bold number; everything else demoted. */}
              <div style={heroBlock}>
                <span className="mono" style={heroNum}>{s.currentStreak}</span>
                <span className="mono" style={heroUnit}>GAME<br />STREAK</span>
              </div>

              {/* Identity + the LENS — demoted, muted context. */}
              <div style={{ flex: 1, minWidth: 0 }}>
                <div style={playerName}>
                  {s.player}{s.team ? <span style={teamTag}> · {s.team}</span> : null}
                </div>
                {/* Part 5 — the archetype glyph+chip (the Rosetta stone),
                    propagated here; self-hides when the join has no archetype. */}
                {s.archetype && (
                  <div style={{ margin: '3px 0' }}>
                    <ArchetypeBadge archetype={s.archetype} sport={sport} size="sm" showDesc />
                  </div>
                )}
                <div className="mono" style={categoryLine}>{s.description}</div>
                <div style={lensLine}>{builtVs}</div>
              </div>

              {/* The single severity accent + tier-gated grade badge. */}
              <div style={rightRail}>
                {sev && <span className="mono" style={{ ...sevChip, color: sev.color, borderColor: sev.color }}>{sev.label}</span>}
                {s.grade && (
                  canSeeGrade
                    ? <GradeBadge grade={s.grade} size="md" glow />
                    : <a href="/pricing" className="mono" style={gradeLock} title="Unlock the grade">GRADE ◆</a>
                )}
              </div>
            </div>
          );
        })}
      </div>
      {hidden > 0 && (
        <a href="/explore" style={upsellStyle}>
          {hidden} more streak{hidden === 1 ? '' : 's'} on the board →
        </a>
      )}
    </section>
  );
}

const panelHeading: React.CSSProperties = {
  fontSize: 12, letterSpacing: '0.12em', textTransform: 'uppercase',
  color: 'var(--text-tertiary, #6A6A78)', margin: '0 0 10px',
};
const rowStyle: React.CSSProperties = {
  display: 'flex', alignItems: 'center', gap: 14,
  padding: '12px 14px', borderRadius: 12,
  background: 'var(--surface, #12121A)', border: '1px solid var(--border, #2A2A36)',
};
// THE HERO NUMBER — deliberately the largest font in the row (mono, tabular).
const heroBlock: React.CSSProperties = {
  flex: '0 0 auto', display: 'flex', alignItems: 'baseline', gap: 6,
  minWidth: 62,
};
const heroNum: React.CSSProperties = {
  fontSize: 38, fontWeight: 800, lineHeight: 1,
  color: 'var(--text-primary, #F0F0F4)', fontVariantNumeric: 'tabular-nums',
  letterSpacing: '-0.03em',
};
const heroUnit: React.CSSProperties = {
  fontSize: 8.5, fontWeight: 700, lineHeight: 1.05, letterSpacing: '0.1em',
  color: 'var(--text-tertiary, #6A6A78)',
};
const playerName: React.CSSProperties = {
  fontSize: 14, fontWeight: 700, color: 'var(--text-primary, #F0F0F4)',
  whiteSpace: 'nowrap', overflow: 'hidden', textOverflow: 'ellipsis',
};
const teamTag: React.CSSProperties = {
  fontSize: 12, fontWeight: 500, color: 'var(--text-tertiary, #6A6A78)',
};
const categoryLine: React.CSSProperties = {
  fontSize: 11, color: 'var(--text-secondary, #9A9AA8)', marginTop: 1,
};
const lensLine: React.CSSProperties = {
  fontSize: 11, color: 'var(--text-tertiary, #6A6A78)', marginTop: 2,
  whiteSpace: 'nowrap', overflow: 'hidden', textOverflow: 'ellipsis',
};
const rightRail: React.CSSProperties = {
  flex: '0 0 auto', display: 'flex', flexDirection: 'column',
  alignItems: 'flex-end', gap: 6,
};
const sevChip: React.CSSProperties = {
  fontSize: 9.5, fontWeight: 700, letterSpacing: '0.06em',
  padding: '2px 7px', borderRadius: 5, border: '1px solid transparent',
  background: 'transparent', whiteSpace: 'nowrap',
};
const gradeLock: React.CSSProperties = {
  fontSize: 10.5, fontWeight: 800, letterSpacing: '0.06em',
  color: 'var(--text-tertiary, #6A6A78)', textDecoration: 'none',
  border: '1px solid var(--border, #2A2A36)', borderRadius: 4, padding: '2px 6px',
};
const upsellStyle: React.CSSProperties = {
  display: 'inline-block', marginTop: 10, fontSize: 12, fontWeight: 600,
  color: 'var(--accent, #E94B3C)', textDecoration: 'none',
};