// The insights panel: what the last turn sent, and what it cost.

import { useEffect, useState } from 'react'
import { api } from '../../../api'
import { SECTION_LABELS, pctLabel, sectionColor } from '../format'
import { CacheReport, TokenBreakdown, WorldStateReport } from '../reports'

function InsightsPanel({ advId, inspectActionId, onClearInspect, refreshKey }) {
  const [report, setReport] = useState(null)
  const [error, setError] = useState(null)

  useEffect(() => {
    let stale = false // a slow earlier request must not clobber a newer one
    setError(null)
    const load = inspectActionId
      ? api.getActionContext(advId, inspectActionId)
      : api.getAdventureContext(advId)
    load
      .then((r) => { if (!stale) setReport(r) })
      .catch((err) => { if (!stale) { setReport(null); setError(err.message) } })
    return () => { stale = true }
  }, [advId, inspectActionId, refreshKey])

  if (error) return <div className="empty">{error}</div>
  if (!report) return <div className="empty">Loading…</div>

  const { tokens, cards, history, sections } = report
  const overBudget = tokens.total > tokens.budget
  // The per-section sum, not tokens.total: the total also counts the separators
  // between sections, and percentages have to add up to 100 for the reader.
  const sectionTotal = sections.reduce((n, s) => n + s.tokens, 0)
  const jumpToSection = (i) => {
    document.getElementById(`ctx-sec-${i}`)?.scrollIntoView({ behavior: 'smooth', block: 'start' })
  }

  return (
    <div className="insights">
      <div className="insights-meta">
        {inspectActionId ? (
          <div className="insights-mode">
            Snapshot of a past turn
            <button onClick={onClearInspect} style={{ marginLeft: 8 }}>Back to next turn</button>
          </div>
        ) : (
          <div className="insights-mode">What will be sent on the next turn</div>
        )}
        <div className={`token-total ${overBudget ? 'over' : ''}`}>
          {tokens.total} / {tokens.budget} tokens
          {/* M6: the reply has to fit in the same window, so say how much of it
              is being held back for one. Without this the reader can see that
              the prompt fits and still get a truncated turn. */}
          {tokens.output_reserve > 0 && (
            <span className="dim"> · {tokens.output_reserve} reserved for the reply</span>
          )}
        </div>
        <TokenBreakdown
          sections={sections}
          tokens={tokens}
          used={sectionTotal}
          onJump={jumpToSection}
        />
        <div className="insights-history">
          History: {history.included} of {history.total} actions in context
          {history.total > history.included && ' (older history trimmed)'}
          {history.oldest_truncated && ' — oldest entry cut mid-text'}
        </div>
        <CacheReport usage={report.usage} />
        {cards.length > 0 && (
          <div className="insights-cards">
            {cards.map((c, i) => (
              <div key={i} className={c.included ? '' : 'dropped'}>
                ▸ <b>{c.name || '(unnamed card)'}</b> triggered on “{c.keyword}”
                {!c.included && ' — dropped (over card budget)'}
              </div>
            ))}
          </div>
        )}
        {report.memories && (
          <div className="insights-cards">
            {report.memories.error && (
              <div className="dropped">⚠ Memory bank: {report.memories.error}</div>
            )}
            {report.memories.used?.map((m, i) => (
              <div key={i}>
                ▸ memory retrieved ({m.pinned ? 'pinned' : `similarity ${m.similarity.toFixed(2)}`})
                {/* M6: what weight it carries, and where it came from. An
                    inference must not read like a record. */}
                {m.authority === 'heuristic'
                  ? <span className="mem-heuristic"> · inferred</span>
                  : <span className="dim"> · from the story</span>}
                {m.source?.depth != null && (
                  <span className="dim">
                    {' '}· turn {m.source.source_start === m.source.source_end
                      ? m.source.depth
                      : `${m.source.source_start}–${m.source.source_end}`}
                  </span>
                )}
                : {m.text.length > 90 ? m.text.slice(0, 90) + '…' : m.text}
              </div>
            ))}
            {report.memories.considered != null && (
              <div className="dim">
                {report.memories.considered} memories eligible on this line of the story.
              </div>
            )}
            {!report.memories.error && report.memories.used?.length === 0 && (
              <div className="dim">Memory bank on — no memories retrieved.</div>
            )}
          </div>
        )}
        {/* M6: which summary was used, and what stretch of story it covers, so
            "what history did that summary cover?" is answerable here. */}
        {report.summary ? (
          <div className="insights-cards">
            <div>
              ▸ summary in use
              <span className="dim">
                {' '}· covers {report.summary.source_start != null
                  ? `turns ${report.summary.source_start}–${report.summary.source_end}`
                  : `up to turn ${report.summary.source_end ?? report.summary.depth}`}
                {report.summary.trigger === 'manual' ? ' · written by you' : ' · generated'}
              </span>
            </div>
          </div>
        ) : (
          <div className="insights-cards dim">▸ no summary is eligible for this point in the story.</div>
        )}
        {/* M6: a dead memory bank used to be invisible. It is not any more. */}
        {report.derived?.some((d) => d.status === 'failed') && (
          <div className="insights-cards">
            {report.derived.filter((d) => d.status === 'failed').map((d) => (
              <div key={d.kind} className="dropped">
                ⚠ Background {d.kind} work is failing ({d.failures}
                {d.failures === 1 ? ' attempt' : ' attempts'}): {d.detail}
              </div>
            ))}
            <div className="dim">
              The story itself is unaffected — this only stops new {' '}
              {report.derived.filter((d) => d.status === 'failed')
                .map((d) => d.kind).join(' and ')} work being written.
            </div>
          </div>
        )}
      </div>

      {sections.map((s, i) => (
        <div
          key={i}
          id={`ctx-sec-${i}`}
          className={`ctx-section ctx-${s.label}`}
          style={{ borderLeftColor: sectionColor(s.label) }}
        >
          <div className="ctx-header" style={{ color: sectionColor(s.label) }}>
            <span>{SECTION_LABELS[s.label] || s.label}</span>
            <span>
              {s.tokens} tok
              {sectionTotal > 0 && ` · ${pctLabel((s.tokens / sectionTotal) * 100)}`}
            </span>
          </div>
          <pre>{s.text}</pre>
        </div>
      ))}
      <WorldStateReport worldState={report.world_state} />
      {report.raw_output && (
        <div className="ctx-section">
          <div className="ctx-header">
            <span>Raw AI output (before state block was stripped)</span>
          </div>
          <pre>{report.raw_output}</pre>
        </div>
      )}
    </div>
  )
}

export { InsightsPanel }