#!/usr/bin/env bun
import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs'
import { dirname, join } from 'path'

const root = process.cwd()
const migrationCsv = join(root, '..', 'JV Migration to shopify', 'products_import_lewis_v4.csv')
const truthRoot = join(root, 'data', 'sources', 'jv-product-truth')
const contentRoot = join(root, 'data', 'content', 'products')
const generatedAt = new Date().toISOString()
const skus = process.argv.slice(2)
const targets = skus.length ? skus : ['JV-TURMERIC500', 'JV-DEFF1000', 'JV-VISISOFT', 'JV-D1000']

function parseCsv(text: string) {
  const rows: string[][] = []
  let row: string[] = []
  let cell = ''
  let quoted = false
  for (let i = 0; i < text.length; i++) {
    const char = text[i]
    const next = text[i + 1]
    if (char === '"') {
      if (quoted && next === '"') { cell += '"'; i++ } else quoted = !quoted
    } else if (char === ',' && !quoted) { row.push(cell); cell = ''
    } else if ((char === '\n' || char === '\r') && !quoted) {
      if (char === '\r' && next === '\n') i++
      row.push(cell)
      if (row.some(value => value !== '')) rows.push(row)
      row = []; cell = ''
    } else cell += char
  }
  row.push(cell)
  if (row.some(value => value !== '')) rows.push(row)
  const headers = rows.shift() || []
  return rows.map(values => Object.fromEntries(headers.map((header, index) => [header, values[index] || ''])))
}
function readJson(path: string, fallback: any = null) {
  if (!existsSync(path)) return fallback
  return JSON.parse(readFileSync(path, 'utf8').replace(/^\uFEFF/, ''))
}
function writeJson(path: string, data: any) {
  mkdirSync(dirname(path), { recursive: true })
  writeFileSync(path, JSON.stringify(data, null, 2) + '\n', 'utf8')
}
function truthForSku(rows: any[], sku: string) {
  const variants = rows.filter(row => row['Variant SKU'] === sku || String(row['Variant SKU'] || '').startsWith(`${sku}-`))
  const master = variants.find(row => row.Title || row['Body HTML']) || variants[0]
  if (!master) return null
  return {
    sku,
    syncedAt: generatedAt,
    sourcePath: migrationCsv,
    handle: master.Handle,
    title: master.Title,
    bodyHtml: master['Body HTML'],
    tags: master.Tags,
    imageSrc: master['Image Src'],
    status: master.Status,
    titleTag: master['Metafield: title_tag [string]'],
    descriptionTag: master['Metafield: description_tag [string]'],
    ingredients: master['Metafield: pdp.ingredients [rich_text_field]'],
    recommendedIntake: master['Metafield: pdp.recommended_intake [single_line_text_field]'],
    strength: master['Metafield: custom.strength [single_line_text_field]'] || master['Metafield: filter.strength [single_line_text_field]'],
    strapline: master['Metafield: pdp.strapline [single_line_text_field]'],
    format: master['Metafield: filter.format [single_line_text_field]'],
    legalCategory: master['Metafield: custom.legal_category [single_line_text_field]'],
    dimensions: master['Metafield: custom.dimensions [single_line_text_field]'],
    quickCode: master['Metafield: code.quickcode [single_line_text_field]'],
    uspList: master['Metafield: usp.list [list.single_line_text_field]'],
    warning: master['Metafield: pdp.warning [multi_line_text_field]'],
    allergens: master['Metafield: pdp.allergens [rich_text_field]'],
    guid: master['Metafield: code.guid [single_line_text_field]'],
    oldUrl: master['Metafield: temp.url [single_line_text_field]'],
    variants: variants.map(row => ({
      sku: row['Variant SKU'],
      pdpTag: '',
      pdpColour: '',
      pdpPricePer: '',
      pdpStrapline: '',
      option: row['Option1 Value'],
      price: row['Variant Price'],
      compareAtPrice: row['Variant Compare At Price'],
      barcode: row['Variant Barcode'],
      inventoryQty: row['Variant Inventory Qty'],
      weight: row['Variant Weight'],
      weightUnit: row['Variant Weight Unit'],
      binLocation: row['Variant Metafield: shipping.bin_location [single_line_text_field]'],
      largeLetterFriendly: row['Variant Metafield: shipping.large_letter_friendly [boolean]'],
      packMultiplier: row['Variant Metafield: shipping.pack_multiplier [single_line_text_field]']
    }))
  }
}

const rows = parseCsv(readFileSync(migrationCsv, 'utf8').replace(/^\uFEFF/, ''))
for (const sku of targets) {
  const truth = truthForSku(rows, sku)
  if (!truth) {
    console.warn(`No JV truth row found for ${sku}`)
    continue
  }
  writeJson(join(truthRoot, `${sku}.json`), truth)
  const contentPath = join(contentRoot, `${sku}.json`)
  const existing = readJson(contentPath, { sku, metafields: {}, approval: {}, sources: {}, notes: [] })
  const updated = {
    ...existing,
    sku,
    handle: existing.handle || truth.handle,
    name: truth.title || existing.name,
    variants: truth.variants.map((variant: any) => ({
      ...(existing.variants || []).find((row: any) => row.sku === variant.sku),
      ...variant
    })),
    sources: {
      ...(existing.sources || {}),
      jvProductTruth: `data/sources/jv-product-truth/${sku}.json`
    },
    notes: Array.from(new Set([
      ...(existing.notes || []),
      'Product truth synced from JV migration database export; internet sources must not override SKU, format, ingredients, intake, warnings, variants, price, barcode or stock truth.'
    ])),
    updatedAt: generatedAt
  }
  if (sku === 'JV-D1000') {
    updated.status = 'product_truth_synced_not_top3_effervescent'
    updated.metafields = {
      ...(updated.metafields || {}),
      filterStrength: truth.strength || updated.metafields?.filterStrength,
      pdpKeyFeatures: [
        truth.strapline,
        truth.recommendedIntake,
        truth.format ? `Format: ${truth.format}` : '',
        'This SKU is High Strength Vitamin D3 1000iu tablets, not the effervescent Vitamin D product.'
      ].filter(Boolean).join('\n')
    }
  }
  writeJson(contentPath, updated)
  console.log(`Synced JV truth for ${sku}: ${truth.title}`)
}