/**
 * Deterministic repairs for LLM-produced Interactive Demo JSON
 * before Zod/semantic validation (common shape/id mistakes).
 */

import {
  ANNOTATION_KINDS,
  CHART_TYPES,
  FORBIDDEN_COLOR_RE,
  INTENT_IDS,
  PATTERN_IDS,
  SCOPE_IDS,
  TRANSITIONS,
} from './constants'

const INTENT_SET = new Set<string>(INTENT_IDS)
const PATTERN_SET = new Set<string>(PATTERN_IDS)
const SCOPE_SET = new Set<string>(SCOPE_IDS)
const ANN_KIND_SET = new Set<string>(ANNOTATION_KINDS)
const CHART_TYPE_SET = new Set<string>(CHART_TYPES)
const TRANSITION_SET = new Set<string>(TRANSITIONS)

const PANEL_TYPE_ALIASES: Record<string, string> = {
  svg: 'svg-scene',
  svg_scene: 'svg-scene',
  'svg-scene': 'svg-scene',
  graph: 'svg-scene',
  diagram: 'svg-scene',
  nodes: 'svg-scene',
  chart: 'chart',
  charts: 'chart',
  line: 'chart',
  bar: 'chart',
  area: 'chart',
  heatmap: 'heatmap-matrix',
  heatmap_matrix: 'heatmap-matrix',
  'heatmap-matrix': 'heatmap-matrix',
  matrix: 'heatmap-matrix',
}

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

function stripForbiddenColorsDeep(value: unknown): unknown {
  if (typeof value === 'string') {
    return FORBIDDEN_COLOR_RE.test(value) ? undefined : value
  }
  if (Array.isArray(value)) {
    return value.map(stripForbiddenColorsDeep).filter((x) => x !== undefined)
  }
  if (value && typeof value === 'object') {
    const out: Record<string, unknown> = {}
    for (const [k, v] of Object.entries(value)) {
      // Keep human strings even if they mention a color in prose
      if (
        k === 'speak' ||
        k === 'title' ||
        k === 'text' ||
        k === 'disclaimer' ||
        k === 'label' ||
        k === 'rowLabels' ||
        k === 'colLabels' ||
        k === 'lang'
      ) {
        out[k] = v
        continue
      }
      const cleaned = stripForbiddenColorsDeep(v)
      if (cleaned !== undefined) out[k] = cleaned
    }
    return out
  }
  return value
}

function normalizeIntent(v: unknown): string | undefined {
  if (typeof v !== 'string') return undefined
  if (INTENT_SET.has(v)) return v
  return 'highlight'
}

function normalizePattern(v: unknown): string | undefined {
  if (typeof v !== 'string') return undefined
  if (PATTERN_SET.has(v)) return v
  const camel = v.replace(/[-_\s]+(.)/g, (_, c: string) => c.toUpperCase())
  if (PATTERN_SET.has(camel)) return camel
  return 'spotlightTour'
}

function normalizeScope(v: unknown): string {
  if (typeof v === 'string' && SCOPE_SET.has(v)) return v
  return 'act'
}

function normalizePanel(panel: unknown, index: number): Record<string, unknown> | null {
  const p = asRecord(panel)
  if (!p) return null

  const rawType = String(p.type ?? '')
  const type = PANEL_TYPE_ALIASES[rawType] || PANEL_TYPE_ALIASES[rawType.toLowerCase()]
  if (!type) return null

  const id =
    typeof p.id === 'string' && p.id.trim()
      ? p.id.trim()
      : `panel.${index + 1}`

  let payload = asRecord(p.payload) ?? {}

  if (type === 'svg-scene') {
    let nodes = Array.isArray(payload.nodes) ? payload.nodes : []
    if (nodes.length === 0 && Array.isArray(p.nodes)) nodes = p.nodes
    nodes = nodes
      .map((n, ni) => {
        const node = asRecord(n)
        if (!node) return null
        const nid =
          typeof node.id === 'string' && node.id.trim()
            ? node.id.trim()
            : `n${ni + 1}`
        return {
          id: nid,
          ...(typeof node.label === 'string' ? { label: node.label } : {}),
          ...(normalizeIntent(node.intent)
            ? { intent: normalizeIntent(node.intent) }
            : {}),
        }
      })
      .filter(Boolean)

    if (nodes.length === 0) {
      nodes = [{ id: 'n1', label: 'Concept', intent: 'highlight' }]
    }

    const nodeIds = new Set(
      (nodes as { id: string }[]).map((n) => n.id)
    )
    let edges = Array.isArray(payload.edges) ? payload.edges : []
    edges = edges
      .map((e, ei) => {
        const edge = asRecord(e)
        if (!edge) return null
        const from = String(edge.from ?? '')
        const to = String(edge.to ?? '')
        if (!nodeIds.has(from) || !nodeIds.has(to)) return null
        return {
          id:
            typeof edge.id === 'string' && edge.id.trim()
              ? edge.id.trim()
              : `e${ei + 1}`,
          from,
          to,
          ...(edge.style === 'dashed' || edge.style === 'solid'
            ? { style: edge.style }
            : {}),
          ...(typeof edge.weight === 'number' ? { weight: edge.weight } : {}),
          ...(normalizeIntent(edge.intent)
            ? { intent: normalizeIntent(edge.intent) }
            : {}),
        }
      })
      .filter(Boolean)

    payload = { nodes, ...(edges.length ? { edges } : {}) }
  } else if (type === 'chart') {
    let series = Array.isArray(payload.series) ? payload.series : []
    series = series
      .map((s, si) => {
        const ser = asRecord(s)
        if (!ser) return null
        const values = Array.isArray(ser.values)
          ? ser.values.map((n) => Number(n)).filter((n) => Number.isFinite(n))
          : []
        if (values.length === 0) return null
        return {
          id:
            typeof ser.id === 'string' && ser.id.trim()
              ? ser.id.trim()
              : `s${si + 1}`,
          ...(typeof ser.label === 'string' ? { label: ser.label } : {}),
          values,
          ...(normalizeIntent(ser.intent)
            ? { intent: normalizeIntent(ser.intent) }
            : {}),
        }
      })
      .filter(Boolean)
    if (series.length === 0) {
      series = [{ id: 's1', values: [1, 2, 3], intent: 'highlight' }]
    }
    const chartType =
      typeof payload.chartType === 'string' &&
      CHART_TYPE_SET.has(payload.chartType)
        ? payload.chartType
        : 'bar'
    payload = { chartType, series }
  } else if (type === 'heatmap-matrix') {
    let rows = Number(payload.rows)
    let cols = Number(payload.cols)
    let values = Array.isArray(payload.values) ? payload.values : []
    if (!Number.isFinite(rows) || rows < 1) rows = values.length || 3
    if (!Number.isFinite(cols) || cols < 1) {
      cols = Array.isArray(values[0]) ? (values[0] as unknown[]).length : 3
    }
    // Pad / trim to declared shape
    const matrix: number[][] = []
    for (let r = 0; r < rows; r++) {
      const row = Array.isArray(values[r]) ? (values[r] as unknown[]) : []
      const outRow: number[] = []
      for (let c = 0; c < cols; c++) {
        const n = Number(row[c])
        outRow.push(Number.isFinite(n) ? n : 0)
      }
      matrix.push(outRow)
    }
    const triangular =
      payload.triangular === 'lower' ||
      payload.triangular === 'upper' ||
      payload.triangular === 'none'
        ? payload.triangular
        : undefined
    payload = {
      rows,
      cols,
      values: matrix,
      ...(triangular ? { triangular } : {}),
      ...(Array.isArray(payload.rowLabels)
        ? { rowLabels: payload.rowLabels.map(String).slice(0, rows) }
        : {}),
      ...(Array.isArray(payload.colLabels)
        ? { colLabels: payload.colLabels.map(String).slice(0, cols) }
        : {}),
    }
  }

  return { id, type, payload }
}

function normalizeScene(scene: unknown): Record<string, unknown> {
  const s = asRecord(scene) ?? {}
  const rawPanels = Array.isArray(s.panels) ? s.panels : []
  const panels = rawPanels
    .map((p, i) => normalizePanel(p, i))
    .filter(Boolean)
    .slice(0, 2) as Record<string, unknown>[]

  if (panels.length === 0) {
    panels.push({
      id: 'panel.main',
      type: 'svg-scene',
      payload: {
        nodes: [
          { id: 'concept', label: 'Idée', intent: 'highlight' },
          { id: 'detail', label: 'Détail', intent: 'compute' },
        ],
        edges: [
          {
            id: 'e1',
            from: 'concept',
            to: 'detail',
            style: 'solid',
            intent: 'flow',
          },
        ],
      },
    })
  }

  return {
    ...(typeof s.id === 'string' && s.id.trim() ? { id: s.id.trim() } : {}),
    panels,
  }
}

function normalizeStep(
  step: unknown,
  actId: string,
  stepIndex: number
): Record<string, unknown> | null {
  const st = asRecord(step)
  if (!st) return null

  const speak =
    typeof st.speak === 'string' && st.speak.trim()
      ? st.speak.trim()
      : 'Regardons cet élément.'

  const id = `${actId}.s${stepIndex + 1}`

  const pointTo = Array.isArray(st.pointTo)
    ? st.pointTo.map(String).filter(Boolean)
    : undefined

  const reveal = Array.isArray(st.reveal)
    ? st.reveal
        .map((r) => {
          const rev = asRecord(r)
          if (!rev || !Array.isArray(rev.ids) || rev.ids.length === 0) return null
          return {
            ids: rev.ids.map(String).filter(Boolean),
            scope: normalizeScope(rev.scope),
          }
        })
        .filter(Boolean)
    : undefined

  let annotate = Array.isArray(st.annotate)
    ? st.annotate
        .map((a) => {
          const ann = asRecord(a)
          if (!ann || !Array.isArray(ann.targetIds) || ann.targetIds.length === 0)
            return null
          const kind =
            typeof ann.kind === 'string' && ANN_KIND_SET.has(ann.kind)
              ? ann.kind
              : 'callout'
          return {
            kind,
            targetIds: ann.targetIds.map(String).filter(Boolean),
            scope: normalizeScope(ann.scope),
            ...(typeof ann.text === 'string' ? { text: ann.text } : {}),
            ...(normalizeIntent(ann.intent)
              ? { intent: normalizeIntent(ann.intent) }
              : {}),
          }
        })
        .filter(Boolean)
    : undefined

  // Drop annotate targets that also appear in pointTo (semantic hard reject)
  if (annotate && pointTo?.length) {
    const pt = new Set(pointTo)
    const filtered = annotate
      .map((a) => {
        if (!a) return null
        const ann = a as {
          targetIds: string[]
          kind: string
          scope: string
          text?: string
          intent?: string
        }
        const targetIds = ann.targetIds.filter((id) => !pt.has(id))
        if (targetIds.length === 0) return null
        return { ...ann, targetIds }
      })
      .filter(Boolean) as NonNullable<(typeof annotate)[number]>[]
    annotate = filtered.length ? filtered : undefined
  }

  return {
    id,
    speak,
    ...(st.pattern !== undefined
      ? { pattern: normalizePattern(st.pattern) }
      : {}),
    ...(pointTo?.length ? { pointTo } : {}),
    ...(reveal?.length ? { reveal } : {}),
    ...(annotate?.length ? { annotate } : {}),
  }
}

function collectElementIdsFromScene(scene: Record<string, unknown>): {
  ids: Set<string>
  wildcardAllowed: boolean
  firstId?: string
} {
  const ids = new Set<string>()
  let wildcardAllowed = false
  const panels = Array.isArray(scene.panels) ? scene.panels : []
  for (const panel of panels) {
    const p = asRecord(panel)
    if (!p) continue
    const payload = asRecord(p.payload) ?? {}
    if (p.type === 'svg-scene') {
      for (const n of Array.isArray(payload.nodes) ? payload.nodes : []) {
        const node = asRecord(n)
        if (node && typeof node.id === 'string') ids.add(node.id)
      }
      for (const e of Array.isArray(payload.edges) ? payload.edges : []) {
        const edge = asRecord(e)
        if (edge && typeof edge.id === 'string') ids.add(edge.id)
      }
    } else if (p.type === 'chart') {
      wildcardAllowed = true
      for (const s of Array.isArray(payload.series) ? payload.series : []) {
        const ser = asRecord(s)
        if (ser && typeof ser.id === 'string') ids.add(ser.id)
      }
    } else if (p.type === 'heatmap-matrix') {
      wildcardAllowed = true
      const rows = Number(payload.rows) || 0
      const cols = Number(payload.cols) || 0
      const triangular = payload.triangular
      for (let r = 1; r <= rows; r++) {
        for (let c = 1; c <= cols; c++) {
          if (triangular === 'lower' && c > r) continue
          if (triangular === 'upper' && c < r) continue
          ids.add(`r${r}.c${c}`)
        }
      }
    }
  }
  return { ids, wildcardAllowed, firstId: ids.values().next().value }
}

function filterStepRefs(
  step: Record<string, unknown>,
  elementIds: Set<string>,
  wildcardAllowed: boolean
): Record<string, unknown> {
  const filterId = (id: string) =>
    id === '*' ? wildcardAllowed : elementIds.has(id)

  if (Array.isArray(step.pointTo)) {
    const pointTo = (step.pointTo as string[]).filter((id) => elementIds.has(id))
    if (pointTo.length) step.pointTo = pointTo
    else delete step.pointTo
  }

  if (Array.isArray(step.reveal)) {
    const reveal = (step.reveal as { ids: string[]; scope: string }[])
      .map((r) => ({
        ...r,
        ids: r.ids.filter(filterId),
      }))
      .filter((r) => r.ids.length > 0)
    if (reveal.length) step.reveal = reveal
    else delete step.reveal
  }

  if (Array.isArray(step.annotate)) {
    const annotate = (
      step.annotate as { targetIds: string[]; [k: string]: unknown }[]
    )
      .map((a) => ({
        ...a,
        targetIds: a.targetIds.filter((id) => elementIds.has(id)),
      }))
      .filter((a) => a.targetIds.length > 0)
    if (annotate.length) step.annotate = annotate
    else delete step.annotate
  }

  return step
}

function normalizeAct(
  act: unknown,
  actIndex: number,
  defaultScene: Record<string, unknown>
): Record<string, unknown> | null {
  const a = asRecord(act)
  if (!a) return null
  const actId = `a${actIndex + 1}`
  const title =
    typeof a.title === 'string' && a.title.trim()
      ? a.title.trim()
      : `Acte ${actIndex + 1}`

  const scene = a.scene ? normalizeScene(a.scene) : undefined
  const activeScene = scene ?? defaultScene
  const { ids, wildcardAllowed, firstId } =
    collectElementIdsFromScene(activeScene)

  const rawSteps = Array.isArray(a.steps) ? a.steps : []
  let steps = rawSteps
    .map((s, si) => normalizeStep(s, actId, si))
    .filter(Boolean)
    .slice(0, 12) as Record<string, unknown>[]

  steps = steps.map((s) => filterStepRefs(s, ids, wildcardAllowed))

  if (steps.length === 0) {
    steps.push({
      id: `${actId}.s1`,
      speak: 'Voici le point clé.',
      pattern: 'overview',
      ...(firstId ? { pointTo: [firstId] } : {}),
    })
  }

  return {
    id: actId,
    title,
    ...(a.pattern !== undefined ? { pattern: normalizePattern(a.pattern) } : {}),
    ...(typeof a.transition === 'string' && TRANSITION_SET.has(a.transition)
      ? { transition: a.transition }
      : {}),
    ...(scene ? { scene } : {}),
    steps,
  }
}

/**
 * Best-effort shape fix so Zod + semantic validate can succeed on near-valid LLM output.
 */
export function normalizeInteractiveDemoCandidate(
  input: unknown,
  lang = 'fr'
): unknown {
  const root = asRecord(input)
  if (!root) return input

  let demo = stripForbiddenColorsDeep(root) as Record<string, unknown>
  demo = asRecord(demo) ?? root

  const safeLang =
    typeof lang === 'string' && /^[a-zA-Z]{2,3}(-[a-zA-Z0-9]{2,8})*$/.test(lang)
      ? lang
      : 'fr'

  demo.schemaVersion = 1
  demo.lang =
    typeof demo.lang === 'string' &&
    /^[a-zA-Z]{2,3}(-[a-zA-Z0-9]{2,8})*$/.test(demo.lang)
      ? demo.lang
      : safeLang

  if (typeof demo.id !== 'string' || !demo.id.trim()) {
    demo.id = 'demo.generated'
  }

  if (typeof demo.disclaimer !== 'string') {
    delete demo.disclaimer
  }

  const scene = normalizeScene(demo.scene)
  demo.scene = scene
  const { firstId } = collectElementIdsFromScene(scene)

  const rawActs = Array.isArray(demo.acts) ? demo.acts : []
  let acts = rawActs
    .map((a, i) => normalizeAct(a, i, scene))
    .filter(Boolean)
    .slice(0, 8) as Record<string, unknown>[]

  if (acts.length === 0) {
    acts = [
      {
        id: 'a1',
        title: 'Introduction',
        pattern: 'spotlightTour',
        steps: [
          {
            id: 'a1.s1',
            speak: 'Voici le point clé.',
            pattern: 'overview',
            ...(firstId ? { pointTo: [firstId] } : {}),
          },
        ],
      },
    ]
  }

  demo.acts = acts
  return demo
}