/**
 * Deterministic repairs for LLM PageSpecV1 before Zod validation.
 * Mirrors interactive-demo/normalize — fix common shape/field aliases.
 */

import { normalizeInteractiveDemoCandidate } from '@/lib/interactive-demo/normalize'
import { CALLOUT_KINDS, INTERACTIVE_PAGE_CAPS } from './constants'

const CALLOUT_SET = new Set<string>(CALLOUT_KINDS)

const CALLOUT_ALIASES: Record<string, string> = {
  definition: 'definition',
  def: 'definition',
  warning: 'warning',
  warn: 'warning',
  danger: 'warning',
  alert: 'warning',
  tip: 'tip',
  hint: 'tip',
  advice: 'tip',
  note: 'note',
  info: 'note',
  remark: 'note',
}

function asRecord(v: unknown): Record<string, unknown> | null {
  return v && typeof v === 'object' && !Array.isArray(v)
    ? (v as Record<string, unknown>)
    : null
}

function asString(v: unknown): string | undefined {
  if (typeof v === 'string' && v.trim()) return v.trim()
  if (typeof v === 'number' && Number.isFinite(v)) return String(v)
  return undefined
}

function slugId(title: string, fallback: string): string {
  const s = title
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '')
    .slice(0, 40)
  return s ? `page.${s}` : fallback
}

function pickMd(obj: Record<string, unknown>): string | undefined {
  return (
    asString(obj.md) ||
    asString(obj.content) ||
    asString(obj.text) ||
    asString(obj.body) ||
    asString(obj.html) ||
    asString(obj.markdown)
  )
}

function pickTex(obj: Record<string, unknown>): string | undefined {
  return (
    asString(obj.tex) ||
    asString(obj.latex) ||
    asString(obj.formula) ||
    asString(obj.math) ||
    asString(obj.equation)
  )
}

function normalizeCalloutKind(v: unknown): string {
  if (typeof v !== 'string') return 'note'
  const key = v.trim().toLowerCase()
  const mapped = CALLOUT_ALIASES[key] || key
  return CALLOUT_SET.has(mapped) ? mapped : 'note'
}

function normalizeBlock(
  raw: unknown,
  index: number
): Record<string, unknown> | null {
  const obj = asRecord(raw)
  if (!obj) return null
  const type = asString(obj.type)?.toLowerCase()
  if (!type) return null

  if (type === 'prose' || type === 'text' || type === 'markdown' || type === 'paragraph') {
    const md = pickMd(obj)
    if (!md) return null
    return { type: 'prose', md }
  }

  if (type === 'formula' || type === 'math' || type === 'equation' || type === 'katex') {
    const tex = pickTex(obj)
    if (!tex) return null
    const out: Record<string, unknown> = { type: 'formula', tex }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  if (type === 'callout' || type === 'aside' || type === 'box') {
    const md = pickMd(obj) || '—'
    const title = asString(obj.title) || asString(obj.heading) || 'Note'
    return {
      type: 'callout',
      kind: normalizeCalloutKind(obj.kind || obj.variant || obj.style),
      title,
      md,
    }
  }

  if (type === 'demo' || type === 'interactive' || type === 'animation') {
    const nested = obj.demo ?? obj.spec ?? obj.interactiveDemo
    if (!nested) return null
    const normalized = normalizeInteractiveDemoCandidate(nested)
    const out: Record<string, unknown> = { type: 'demo', demo: normalized }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  if (type === 'chart' || type === 'graph') {
    const payload = asRecord(obj.payload) || asRecord(obj.chart) || obj
    const series = Array.isArray((payload as Record<string, unknown>).series)
      ? (payload as Record<string, unknown>).series
      : null
    if (!series) return null
    const chartType =
      asString((payload as Record<string, unknown>).chartType) ||
      asString(obj.chartType) ||
      'line'
    const out: Record<string, unknown> = {
      type: 'chart',
      payload: {
        chartType: ['line', 'bar', 'area'].includes(chartType) ? chartType : 'line',
        series,
      },
    }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  if (type === 'stats' || type === 'metrics' || type === 'kpis') {
    const items = Array.isArray(obj.items) ? obj.items : Array.isArray(obj.stats) ? obj.stats : null
    if (!items || items.length < 2) return null
    return {
      type: 'stats',
      items: items.slice(0, INTERACTIVE_PAGE_CAPS.maxStatsItems).map((it) => {
        const r = asRecord(it) || {}
        return {
          value: asString(r.value) || asString(r.v) || '—',
          label: asString(r.label) || asString(r.name) || '—',
          ...(asString(r.intent) ? { intent: asString(r.intent) } : {}),
        }
      }),
    }
  }

  if (type === 'table') {
    const columns = Array.isArray(obj.columns)
      ? obj.columns.map((c) => asString(c) || '—')
      : []
    const rows = Array.isArray(obj.rows) ? obj.rows : []
    if (!columns.length) return null
    const out: Record<string, unknown> = { type: 'table', columns, rows }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  if (type === 'image' || type === 'img' || type === 'figure') {
    const src = asString(obj.src) || asString(obj.url)
    const alt = asString(obj.alt) || asString(obj.title) || 'Image'
    if (!src) return null
    const out: Record<string, unknown> = { type: 'image', src, alt }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  if (type === 'sim' || type === 'simulation' || type === 'slider' || type === 'interactive-sim') {
    const sim = asRecord(obj.sim) || asRecord(obj.simulator) || obj
    const simId = asString(sim.simId) || asString(sim.simulator) || asString(sim.id)
    if (!simId) return null
    const out: Record<string, unknown> = { type: 'sim', sim: { ...sim, simId } }
    const caption = asString(obj.caption)
    if (caption) out.caption = caption
    return out
  }

  return null
}

function normalizeSection(
  raw: unknown,
  index: number
): Record<string, unknown> | null {
  const obj = asRecord(raw)
  if (!obj) return null
  const title = asString(obj.title) || asString(obj.heading) || `Section ${index + 1}`
  const id = asString(obj.id) || `s${index + 1}`
  const blocksRaw = Array.isArray(obj.blocks)
    ? obj.blocks
    : Array.isArray(obj.content)
      ? obj.content
      : []
  const blocks = blocksRaw
    .map((b, i) => normalizeBlock(b, i))
    .filter(Boolean)
    .slice(0, INTERACTIVE_PAGE_CAPS.maxBlocksPerSection) as Record<string, unknown>[]
  if (!blocks.length) {
    blocks.push({
      type: 'prose',
      md: asString(obj.summary) || asString(obj.lead) || title,
    })
  }
  return { id, title, blocks }
}

/**
 * Best-effort normalize of an LLM page candidate.
 * Returns a plain object ready for validateInteractivePage.
 */
export function normalizeInteractivePageCandidate(
  input: unknown,
  lang = 'fr'
): Record<string, unknown> | null {
  const root = asRecord(input)
  if (!root) return null

  const heroIn = asRecord(root.hero) || {}
  const title =
    asString(heroIn.title) ||
    asString(root.title) ||
    'Page interactive'
  const kicker =
    asString(heroIn.kicker) ||
    asString(heroIn.eyebrow) ||
    asString(heroIn.label) ||
    (lang.startsWith('fr') ? 'EXPLAINER INTERACTIF' : 'INTERACTIVE EXPLAINER')

  const hero: Record<string, unknown> = {
    kicker,
    title,
  }
  const subtitle = asString(heroIn.subtitle) || asString(root.subtitle)
  const meta = asString(heroIn.meta) || asString(root.meta)
  if (subtitle) hero.subtitle = subtitle
  if (meta) hero.meta = meta

  let overview: Record<string, unknown> | undefined
  const overviewIn = asRecord(root.overview)
  if (overviewIn) {
    const lead =
      asString(overviewIn.lead) ||
      asString(overviewIn.summary) ||
      asString(overviewIn.text)
    const cardsRaw = Array.isArray(overviewIn.cards) ? overviewIn.cards : []
    const cards = cardsRaw
      .map((c) => {
        const r = asRecord(c)
        if (!r) return null
        const badge = asString(r.badge) || asString(r.label) || 'IDEA'
        const cTitle = asString(r.title) || badge
        const body = asString(r.body) || asString(r.text) || asString(r.md) || cTitle
        return {
          badge,
          title: cTitle,
          body,
          ...(asString(r.intent) ? { intent: asString(r.intent) } : {}),
        }
      })
      .filter(Boolean)
    if (lead && cards.length >= INTERACTIVE_PAGE_CAPS.minOverviewCards) {
      overview = {
        lead,
        cards: cards.slice(0, INTERACTIVE_PAGE_CAPS.maxOverviewCards),
      }
    } else if (lead) {
      // Pad to min cards so validation can pass
      const padded = [...cards]
      while (padded.length < INTERACTIVE_PAGE_CAPS.minOverviewCards) {
        padded.push({
          badge: `C${padded.length + 1}`,
          title: title,
          body: lead.slice(0, 120),
        })
      }
      overview = {
        lead,
        cards: padded.slice(0, INTERACTIVE_PAGE_CAPS.maxOverviewCards),
      }
    }
  }

  const sectionsRaw = Array.isArray(root.sections) ? root.sections : []
  let sections = sectionsRaw
    .map((s, i) => normalizeSection(s, i))
    .filter(Boolean) as Record<string, unknown>[]

  // Cap demos (speed + reliability): keep first 2
  let demoCount = 0
  sections = sections.map((sec) => {
    const blocks = (sec.blocks as Record<string, unknown>[]).filter((b) => {
      if (b.type !== 'demo') return true
      demoCount += 1
      return demoCount <= 2
    })
    return { ...sec, blocks }
  })

  sections = sections.slice(0, 5)
  if (!sections.length) {
    sections = [
      {
        id: 's1',
        title: title,
        blocks: [{ type: 'prose', md: asString(root.summary) || title }],
      },
    ]
  }

  const out: Record<string, unknown> = {
    schemaVersion: 1,
    id: asString(root.id) || slugId(title, 'page.generated'),
    lang: asString(root.lang) || lang,
    hero,
    sections,
  }
  if (overview) out.overview = overview
  const footer = asString(root.footer)
  if (footer) out.footer = footer
  return out
}