'use server'

import DOMPurify from 'isomorphic-dompurify'
import { auth } from '@/auth'
import { prisma } from '@/lib/prisma'
import { getChatProvider } from '@/lib/ai/factory'
import { getSystemConfig } from '@/lib/config'
import { getAISettings } from '@/app/actions/ai-settings'
import { revalidatePath } from 'next/cache'

type SvgComplexity = 'simple' | 'illustrated' | 'rich'

// Palette de l'application Momento — à utiliser dans TOUS les SVGs
const APP_PALETTE = `
APP COLOR PALETTE (use ONLY these colors — no other palettes):
- Background warm beige: #F2F0E9
- Desk warm grey: #E5E2D9
- Brand copper: #A47148 (main accent — use for key shapes)
- Sage green: #ACB995 (secondary accent)
- Ink charcoal: #2C2A26 (for dark shapes, text)
- Warm tan: #C9B8A1 (mid tones)
- Soft cream: #FAF8F4 (light elements)
- Dusty rose: #C4998B (warm pink accent)
- Muted slate: #8D8D8D (subtle elements)
- Deep bark: #6B4C35 (dark brown for depth)

FORBIDDEN colors: cold blue, navy, electric cyan, neon, pure white (#fff), pure black (#000)
The overall mood must be WARM, EDITORIAL, like aged paper with copper accents.
`

function extractSvgSnippet(raw: string): string | null {
  let text = raw
    .replace(/<think>[\s\S]*?<\/think>/gi, '')
    .replace(/```(?:svg|xml)?\s*/gi, '')
    .replace(/```/g, '')
    .trim()
  const start = text.indexOf('<svg')
  const end = text.lastIndexOf('</svg>')
  if (start === -1 || end === -1 || end <= start) return null
  return text.slice(start, end + 6)
}

function sanitizeSvgMarkup(svg: string): string {
  return DOMPurify.sanitize(svg, {
    USE_PROFILES: { svg: true, svgFilters: true },
    ADD_TAGS: [
      'use', 'defs', 'linearGradient', 'radialGradient', 'stop',
      'filter', 'feDropShadow', 'feGaussianBlur', 'feBlend', 'feComposite',
      'feMerge', 'feMergeNode', 'feColorMatrix', 'feOffset', 'feTurbulence',
      'feDisplacementMap', 'clipPath', 'mask', 'pattern', 'symbol', 'marker',
    ],
    ADD_ATTR: [
      'viewBox', 'xmlns', 'preserveAspectRatio',
      'gradientUnits', 'gradientTransform', 'spreadMethod',
      'offset', 'stop-color', 'stop-opacity',
      'stdDeviation', 'dx', 'dy', 'flood-color', 'flood-opacity',
      'in', 'in2', 'result', 'type', 'values',
      'markerWidth', 'markerHeight', 'refX', 'refY', 'orient',
      'font-family', 'font-size', 'font-weight', 'text-anchor',
      'dominant-baseline', 'letter-spacing', 'word-spacing',
      'baseFrequency', 'numOctaves', 'seed', 'scale',
    ],
  })
}

function buildPrompt(
  complexity: SvgComplexity,
  plainTitle: string,
  plainBody: string,
): string {
  const title = (plainTitle || 'Note').slice(0, 200)
  const bodyContext = plainBody.slice(0, 2000)

  const sharedRules = `
MULTILINGUAL: The title/content may be in French, Persian, Arabic, English or any language. Ignore the language — produce VISUAL output only.

${APP_PALETTE}

ABSOLUTELY FORBIDDEN:
- Generic/meaningless shapes: plain eye shapes, nested concentric circles with a triangle, abstract orbits, random geometric blobs
- Cold colors: blue, navy, cyan, neon green, purple, electric tones
- Shapes that have NO visual connection to the topic
- Gradients that go dark-to-dark with cold tones
- Dashed circles or crosshair-style patterns unless the topic is literally about targeting/aiming

WHAT MAKES A GOOD ILLUSTRATION:
- A viewer who sees the SVG and reads the title should say "yes, that makes sense"
- Concrete objects > abstract shapes (airplane > circle, book > rectangle, brain > circle with bumps)
- The most recognizable iconic form of the concept
- Warmth and editorial feel matching the app palette
`

  if (complexity === 'simple') {
    return `You are a precision SVG icon designer creating note card thumbnails for a warm editorial note-taking app.

Your task: create ONE clear, iconic pictogram that represents THIS SPECIFIC note topic.

${sharedRules}

OUTPUT: Raw SVG ONLY. <svg viewBox="0 0 400 300"> ... </svg>. No markdown, no comments.

CANVAS: viewBox="0 0 400 300" — NO width/height attributes.
SIZE TARGET: 800-1400 bytes of SVG markup.

DESIGN APPROACH — "Warm Stamp" style:
- Background: fill entire canvas with warm beige #F2F0E9
- Add a subtle texture rectangle: <rect width="400" height="300" fill="#E5E2D9" opacity="0.3"/>
- Main pictogram: centered, using brand copper #A47148 as primary color
- Secondary element: sage green #ACB995 for accents or depth
- The pictogram fills roughly 40-55% of the canvas height — large and readable

SPECIFIC TOPIC → SPECIFIC SHAPE rules (think like a professional icon designer):
- AI / Machine Learning → neural network nodes connected by lines, OR a stylized brain with circuit paths
- Tech analysis / research → magnifying glass over a document or graph bars
- Travel / flights → an airplane silhouette (side view, classic shape with wings)
- Governance / regulation → scales of justice, OR a shield with checkmark
- Innovation / startup → rocket ship, OR a lightbulb with circuit inside
- Cooking / food → specific food item mentioned, OR bowl with utensils
- Finance / money → ascending bar chart, OR coin stack
- Nature / environment → tree with roots showing, OR mountain peaks
- Music → treble clef, OR speaker with sound waves
- Health / medical → heartbeat line, OR medical cross
- Education / learning → open book with pages, OR graduation cap
- Writing / literature → quill pen, OR typewriter keys
- Philosophy / thinking → head silhouette with thought bubble, OR question mark with gears
- Calendar / date / event → calendar grid with highlighted date
- Sport → the specific sport equipment mentioned
- Data / statistics → bar chart or scatter plot dots
- Social / community → group of overlapping person silhouettes

DO NOT use a generic shape if the topic is specific. Read CAREFULLY:
- "Tensions IA" → NOT a circle+triangle → USE: two opposing arrows pulling apart, OR a scale with AI chip on one side
- "Veille IA & Tech" → NOT an eye → USE: a magnifying glass over circuit board, OR stacked tech layers with a search icon
- "Gouvernance" → USE: shield with checkmark, OR gavel/hammer of judge
- "Innovation" → USE: rocket or lightbulb

TITLE: "${title}"
CONTENT (for context):
${bodyContext.slice(0, 500)}`
  }

  if (complexity === 'illustrated') {
    return `You are a professional SVG illustrator creating rich editorial card illustrations for a warm note-taking app.

${sharedRules}

OUTPUT: Raw SVG ONLY. <svg viewBox="0 0 400 300"> ... </svg>. No markdown, no comments.

CANVAS: viewBox="0 0 400 300" — NO width/height attributes.
SIZE TARGET: 2000-3500 bytes.

DESIGN APPROACH — "Editorial Print" style:
- Layered composition: background fill → texture layer → mid elements → focal element → foreground details
- Use <defs> with 1-2 gradients (warm tones only — from the app palette)
- 12-20 SVG elements
- The illustration should tell a visual story about the note content
- Add subtle paper texture: <rect fill="#E5E2D9" opacity="0.2" width="400" height="300"/>
- Focal element is specific and recognizable (not abstract)
- Depth through opacity stacking (0.2, 0.4, 0.7, 1.0 layers)

Example structure for "AI Tech Analysis":
- Background: warm beige rect
- Mid: faint grid lines in #C9B8A1 suggesting a document or data surface  
- Focal: a magnifying glass (#A47148) with a neural net pattern visible inside its lens
- Foreground: small data points or chip-like squares in #ACB995

TITLE: "${title}"
CONTENT:
${bodyContext.slice(0, 1000)}`
  }

  // 'rich' — carte conceptuelle
  return `You are an expert information designer creating SVG concept maps for a warm editorial note-taking app.

${sharedRules}

OUTPUT: Raw SVG ONLY. <svg viewBox="0 0 400 300"> ... </svg>. No markdown, no comments.

CANVAS: viewBox="0 0 400 300" — NO width/height attributes.
SIZE TARGET: 2500-4000 bytes.

DESIGN APPROACH — "Warm Knowledge Map":
- Background: warm beige #F2F0E9 (NOT dark — this is a LIGHT warm background)
- Node style: rounded <rect rx="8"> with #A47148 fill for main node, #ACB995 for secondary, #C9B8A1 for tertiary
- Text inside nodes: <text fill="#FAF8F4" font-family="Georgia, serif" font-size="11" font-weight="bold">
- Connection lines: <line stroke="#A47148" stroke-width="1.5" opacity="0.5">
- Arrow markers: <defs><marker> with copper fill
- Drop shadows on nodes: <filter><feDropShadow dx="1" dy="2" stdDeviation="2" flood-color="#00000022">

STRUCTURE:
1. Central node (title concept) — large, centered or slightly left, #A47148
2. 3-5 satellite nodes for key sub-concepts from the content body
3. Labels: SHORT (2-3 words), in the app's serif style
4. Spread across the canvas — use the full 400×300 space

TITLE: "${title}"
CONTENT (extract 3-5 key concepts):
${bodyContext.slice(0, 1500)}`
}

/**
 * Génère ou regénère une illustration SVG pour une note.
 */
export async function generateNoteIllustrationSvg(
  noteId: string,
  options?: { skipRevalidation?: boolean },
): Promise<{ ok: true } | { ok: false; error: string }> {
  const session = await auth()
  if (!session?.user?.id) return { ok: false, error: 'Non autorisé' }

  try {
    const settings = await getAISettings(session.user.id)
    if (settings.paragraphRefactor === false) {
      return { ok: false, error: 'Assistant IA désactivé dans vos paramètres.' }
    }

    const complexity: SvgComplexity =
      (settings.svgComplexity as SvgComplexity) ?? 'simple'

    const note = await prisma.note.findFirst({
      where: { id: noteId, userId: session.user.id },
      select: { id: true, title: true, content: true },
    })
    if (!note) return { ok: false, error: 'Note introuvable' }

    const plainTitle = (note.title || '').slice(0, 200)
    const plainBody = note.content
      .replace(/<[^>]+>/g, ' ')
      .replace(/\s+/g, ' ')
      .trim()

    if (!plainBody && !plainTitle) {
      return { ok: false, error: 'Ajoutez du contenu avant de générer une illustration.' }
    }

    const config = await getSystemConfig()
    const provider = getChatProvider(config)

    const prompt = buildPrompt(complexity, plainTitle, plainBody)
    const raw = await provider.generateText(prompt)
    const extracted = extractSvgSnippet(raw)
    if (!extracted) {
      return { ok: false, error: 'Le modèle n\'a pas renvoyé un SVG valide. Réessayez.' }
    }

    const safe = sanitizeSvgMarkup(extracted)
    if (!safe.includes('<svg')) {
      return { ok: false, error: 'SVG rejeté après sécurisation.' }
    }

    await prisma.note.update({
      where: { id: noteId, userId: session.user.id },
      data: {
        illustrationSvg: safe,
        lastAiAnalysis: new Date(),
      },
    })

    if (!options?.skipRevalidation) {
      revalidatePath('/home')
    }
    return { ok: true }
  } catch (e) {
    console.error('[note-illustration]', e)
    const msg = e instanceof Error ? e.message : 'Erreur inconnue'
    return {
      ok: false,
      error: msg.includes('required')
        ? 'Configurez un fournisseur IA (admin ou paramètres système).'
        : msg,
    }
  }
}