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import { readdirSync, readFileSync, statSync, writeFileSync } from 'node:fs'

import { dirname, join, relative } from 'node:path'

import { fileURLToPath } from 'node:url'

const packageRoot = fileURLToPath(

new URL('../packages/table-core/', import.meta.url),

)

const distDir = join(packageRoot, 'dist')

const forbiddenTypeNames = ['Table_Internal', 'Column_Internal']

function walkDeclarationFiles(dir) {

const files = []

for (const entry of readdirSync(dir)) {

const path = join(dir, entry)

const stat = statSync(path)

if (stat.isDirectory()) {

files.push(...walkDeclarationFiles(path))

continue

}

if (path.endsWith('.d.ts')) {

files.push(path)

}

}

return files

}

function removeExportedInterface(source, interfaceName) {

let start = source.indexOf(`export interface ${interfaceName}`)

if (start === -1) {

start = source.indexOf(`interface ${interfaceName}`)

}

if (start === -1) {

return source

}

const bodyStart = source.indexOf('{', start)

if (bodyStart === -1) {

throw new Error(`Could not find body for ${interfaceName}`)

}

let depth = 0

for (let i = bodyStart; i < source.length; i++) {

const char = source[i]

if (char === '{') {

depth++

} else if (char === '}') {

depth--

if (depth === 0) {

let end = i + 1

while (source[end] === '\n' || source[end] === '\r') {

end++

}

return source.slice(0, start) + source.slice(end)

}

}

}

throw new Error(`Could not find end of ${interfaceName}`)

}

function removeTypeAlias(source, typeName) {

const aliasPattern = new RegExp(

String.raw`\b(?:export\s+)?type\s+${typeName}\b`,

)

const match = aliasPattern.exec(source)

if (!match) {

return source

}

const start = match.index

const end = source.indexOf(';', start)

if (end === -1) {

throw new Error(`Could not find end of ${typeName}`)

}

return source.slice(0, start) + source.slice(end + 1)

}

function getSpecifierName(specifier) {

return specifier

.replace(/^type\s+/, '')

.split(/\s+as\s+/)[0]

?.trim()

}

function removeNamedSpecifiers(source, names) {

return source

.replace(

/\b(import|export)(\s+type)?\s+\{([^}]+)\}\s+from\s+([^;\n]+);/g,

(statement, kind, typeKeyword = '', specifiers, fromClause) => {

const nextSpecifiers = specifiers

.split(',')

.map((specifier) => specifier.trim())

.filter(Boolean)

.filter((specifier) => {

const importedName = getSpecifierName(specifier)

return importedName && !names.includes(importedName)

})

if (!nextSpecifiers.length) {

return ''

}

return `${kind}${typeKeyword} { ${nextSpecifiers.join(

', ',

)} } from ${fromClause};`

},

)

.replace(

/\bexport(\s+type)?\s+\{([^}]+)\};/g,

(statement, typeKeyword = '', specifiers) => {

const nextSpecifiers = specifiers

.split(',')

.map((specifier) => specifier.trim())

.filter(Boolean)

.filter((specifier) => {

const exportedName = getSpecifierName(specifier)

return exportedName && !names.includes(exportedName)

})

if (!nextSpecifiers.length) {

return ''

}

return `export${typeKeyword} { ${nextSpecifiers.join(', ')} };`

},

)

}

function rewriteInternalImportSpecifiers(source) {

const replacements = new Map([

['Table_Internal', 'Table'],

['Column_Internal', 'Column'],

])

return source.replace(

/\bimport(\s+type)?\s+\{([^}]+)\}\s+from\s+([^;\n]+);/g,

(statement, typeKeyword = '', specifiers, fromClause) => {

const seen = new Set()

const nextSpecifiers = []

for (const rawSpecifier of specifiers.split(',')) {

const specifier = rawSpecifier.trim()

if (!specifier) {

continue

}

const isTypeSpecifier = specifier.startsWith('type ')

const specifierName = getSpecifierName(specifier)

const replacement = replacements.get(specifierName)

const nextSpecifier = replacement

? `${isTypeSpecifier ? 'type ' : ''}${replacement}`

: specifier

const nextSpecifierName = getSpecifierName(nextSpecifier)

if (seen.has(nextSpecifierName)) {

continue

}

seen.add(nextSpecifierName)

nextSpecifiers.push(nextSpecifier)

}

return `import${typeKeyword} { ${nextSpecifiers.join(

', ',

)} } from ${fromClause};`

},

)

}

function getImportPath(fromFile, typeName) {

const target = join(distDir, 'types', `${typeName}.js`)

let importPath = relative(dirname(fromFile), target).replaceAll('\\', '/')

if (!importPath.startsWith('.')) {

importPath = `./${importPath}`

}

return importPath

}

function hasNamedImport(source, name, importPath) {

const importPattern =

/\bimport(?:\s+type)?\s+\{([^}]+)\}\s+from\s+["']([^"']+)["'];/g

for (const match of source.matchAll(importPattern)) {

const specifiers = match[1] ?? ''

const fromClause = match[2]

if (fromClause !== importPath) {

continue

}

if (

specifiers

.split(',')

.map((specifier) => getSpecifierName(specifier.trim()))

.includes(name)

) {

return true

}

}

return false

}

function ensureNamedImport(source, name, importPath) {

if (hasNamedImport(source, name, importPath)) {

return source

}

const importPattern = new RegExp(

String.raw`\bimport(\s+type)?\s+\{([^}]+)\}\s+from\s+["']${importPath.replace(

/[.*+?^${}()|[\]\\]/g,

'\\$&',

)}["'];`,

)

const match = importPattern.exec(source)

if (match) {

const [statement, typeKeyword = '', specifiers] = match

const nextStatement = `import${typeKeyword} { ${[

...specifiers.split(',').map((specifier) => specifier.trim()),

name,

]

.filter(Boolean)

.join(', ')} } from "${importPath}";`

return (

source.slice(0, match.index) +

nextStatement +

source.slice(match.index + statement.length)

)

}

return `import { ${name} } from "${importPath}";\n${source}`

}

function ensurePublicTypeImports(source, file) {

let next = source

if (!file.endsWith('/types/Table.d.ts') && /\bTable</.test(next)) {

next = ensureNamedImport(next, 'Table', getImportPath(file, 'Table'))

}

if (!file.endsWith('/types/Column.d.ts') && /\bColumn</.test(next)) {

next = ensureNamedImport(next, 'Column', getImportPath(file, 'Column'))

}

return next

}

// A declaration file without an export statement exports every top-level

// declaration, including private helpers that are only reachable through deep

// paths blocked by the package `exports` map. Consumers emitting declarations

// then fail with TS2883 when an inferred type references one of them.

// rolldown-plugin-dts 0.28.2+ inlines `export` modifiers and drops the

// trailing `export { … }`, so restore the marker here.

const exportStatementPattern = /^\s*export\s*(?:type\s*)?(?:\{[^}]*\}|\*|=)/m

function ensureExportStatement(source) {

if (exportStatementPattern.test(source)) {

return source

}

return `${source.trimEnd()}\nexport {};\n`

}

function rewriteDeclaration(source, file) {

let next = source

for (const typeName of forbiddenTypeNames) {

next = removeExportedInterface(next, typeName)

}

next = removeTypeAlias(next, 'Table_InternalBroadenedKeys')

next = rewriteInternalImportSpecifiers(next)

next = removeNamedSpecifiers(next, forbiddenTypeNames)

next = next.replaceAll('Table_Internal<', 'Table<')

next = next.replaceAll('Column_Internal<', 'Column<')

next = next.replaceAll('Table_Internal', 'Table')

next = next.replaceAll('Column_Internal', 'Column')

next = ensurePublicTypeImports(next, file)

next = ensureExportStatement(next)

return next

}

const files = walkDeclarationFiles(distDir)

for (const file of files) {

const source = readFileSync(file, 'utf8')

const next = rewriteDeclaration(source, file)

if (next !== source) {

writeFileSync(file, next)

}

}

const leaks = []

for (const file of files) {

const source = readFileSync(file, 'utf8')

for (const typeName of forbiddenTypeNames) {

if (source.includes(typeName)) {

leaks.push(`${file}: ${typeName}`)

}

}

}

if (leaks.length) {

throw new Error(

`Internal table-core types leaked into emitted declarations:\n${leaks.join(

'\n',

)}`,

)

}