import React from 'react'

import { GANTT, type IssueRef } from '../../data/fixtures.js'
import { Icon } from '../ui/index.js'

// Gantt drill-in — scheduler-derived bars, critical chain, 80% forecast tails
export function GanttView({ onOpenIssue }: { onOpenIssue: (issue: IssueRef) => void }) {
  const g = GANTT;

  const LABELW = 232, DAYW = 21, ROWH = 36, HEADH = 30;
  const chartW = g.days * DAYW;
  const W = LABELW + chartW;
  const H = HEADH + g.rows.length * ROWH;
  const X = (d: number) => LABELW + d * DAYW;

  const BAR: Record<string, { bg: string; border: string; text: string }> = {
    done: { bg: 'var(--paper-3)', border: 'transparent', text: 'var(--ink-3)' },
    steeping: { bg: 'var(--accent)', border: 'transparent', text: 'var(--ink-inverse)' },
    review: { bg: 'var(--info-tint)', border: 'var(--info)', text: 'var(--info)' },
    scheduled: { bg: 'var(--spruce-2)', border: 'var(--spruce-3)', text: 'var(--accent-text)' },
  };

  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: 12, flex: 1, minHeight: 0 }}>
      {/* legend */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 16, font: '400 11.5px var(--font-mono)', color: 'var(--ink-2)', whiteSpace: 'nowrap', flexWrap: 'wrap' }}>
        {[['steeping', 'in work'], ['review', 'in review'], ['scheduled', 'scheduled'], ['done', 'done']].map(([k, label]) => (
          <span key={k} style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
            <span style={{ width: 16, height: 9, borderRadius: 3, background: BAR[k].bg, border: `1px solid ${BAR[k].border}`, display: 'inline-block' }}></span>{label}
          </span>
        ))}
        <span style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
          <span style={{ width: 18, height: 0, borderTop: '2px dotted var(--cone-line)', display: 'inline-block' }}></span>80% tail
        </span>
        <span style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
          <span style={{ width: 2, height: 12, background: 'var(--jade)', display: 'inline-block' }}></span>today
        </span>
      </div>

      {/* chart */}
      <div style={{ overflow: 'auto', flex: 1, minHeight: 0, border: '1px solid var(--line-1)', borderRadius: 'var(--radius-3)', background: 'var(--surface-card)' }}>
        <div style={{ position: 'relative', width: W, height: H }}>
          {/* week gridlines + labels */}
          {g.weeks.map((w) => (
            <React.Fragment key={w.at}>
              <div style={{ position: 'absolute', left: X(w.at), top: HEADH, bottom: 0, width: 1, background: 'var(--line-1)' }}></div>
              <span style={{ position: 'absolute', left: X(w.at) + 5, top: 8, font: '400 10.5px var(--font-mono)', color: 'var(--ink-3)', whiteSpace: 'nowrap' }}>{w.label}</span>
            </React.Fragment>
          ))}
          {/* milestone 80% band */}
          <div style={{ position: 'absolute', left: X(g.band.from), width: (g.band.to - g.band.from) * DAYW, top: HEADH, bottom: 0, background: 'var(--cone-fill)' }}></div>
          <span style={{ position: 'absolute', left: X(g.band.from) + 5, bottom: 6, font: '500 10.5px var(--font-mono)', color: 'var(--cone-line)', whiteSpace: 'nowrap' }}>{g.band.label}</span>
          {/* due marker */}
          <div style={{ position: 'absolute', left: X(g.due.at) - 1, top: HEADH, bottom: 0, width: 2, background: 'var(--ink-1)' }}></div>
          <span style={{ position: 'absolute', left: X(g.due.at) - 4, top: HEADH - 12, width: 8, height: 8, background: 'var(--ink-1)', transform: 'rotate(45deg)' }}></span>
          {/* today rule */}
          <div style={{ position: 'absolute', left: X(g.today), top: HEADH, bottom: 0, width: 2, background: 'var(--jade)' }}></div>

          {/* rows */}
          {g.rows.map((r, i) => {
            const top = HEADH + i * ROWH;
            const st = BAR[r.state];
            return (
              <React.Fragment key={r.id}>
                {/* row hairline */}
                <div style={{ position: 'absolute', left: 0, right: 0, top: top, height: 1, background: 'var(--line-1)', opacity: 0.6 }}></div>
                {/* label cell (sticky) */}
                <div
                  onClick={() => onOpenIssue({ id: r.id, title: r.title, labels: [], days: r.state === 'steeping' ? '4d' : undefined })}
                  style={{
                    position: 'absolute', left: 0, width: LABELW, height: ROWH, top: top, zIndex: 2, cursor: 'pointer',
                    display: 'flex', alignItems: 'center', gap: 8, padding: '0 12px 0 14px', background: 'var(--surface-card)',
                    borderRight: '1px solid var(--line-1)',
                    boxShadow: r.crit ? 'inset 2px 0 0 var(--accent)' : 'none',
                  }}
                >
                  <span style={{ font: '400 11px var(--font-mono)', color: 'var(--ink-3)', flexShrink: 0 }}>#{r.id}</span>
                  <span style={{ font: '500 12px/1.3 var(--font-sans)', color: 'var(--ink-1)', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{r.title}</span>
                  <span style={{ font: '600 8.5px/16px var(--font-sans)', color: 'var(--accent-text)', background: 'var(--spruce-2)', width: 16, height: 16, borderRadius: '50%', textAlign: 'center', flexShrink: 0, marginLeft: 'auto' }}>{r.who}</span>
                </div>
                {/* bar */}
                <div style={{
                  position: 'absolute', left: X(r.start), width: (r.end - r.start) * DAYW, top: top + 9, height: 18,
                  background: st.bg, border: `1px solid ${st.border}`, borderRadius: 4,
                  boxShadow: r.crit && r.state !== 'steeping' ? 'inset 0 -2px 0 var(--accent)' : 'none',
                }}></div>
                {/* 80% tail */}
                {r.p80 ? (
                  <>
                    <div style={{ position: 'absolute', left: X(r.end), width: (r.p80 - r.end) * DAYW, top: top + 17, height: 0, borderTop: '2px dotted var(--cone-line)' }}></div>
                    <div style={{ position: 'absolute', left: X(r.p80) - 1, top: top + 13, width: 2, height: 10, background: 'var(--cone-line)' }}></div>
                  </>
                ) : null}
              </React.Fragment>
            );
          })}
        </div>
      </div>

      <p style={{ font: 'var(--text-agent)', color: 'var(--ink-2)', margin: 0 }}>
        The path holds if #87 lands by Wednesday. The dotted tails are your own history, wagging.
      </p>
    </div>
  );
}
