import { resolve } from 'node:path'
import { performance } from 'node:perf_hooks'

import { analyzeProject } from './analyze.js'
import { dedupeDiagnostics, type LintResult } from './diagnostic.js'
import { runOxlint } from './oxlint/run.js'
import { assertSingleTypeUniverse } from './preflight.js'
import { discoverProject } from './project.js'

export type LintDomainOptions = {
  root?: string
  fix?: boolean
  preflight?: boolean
  /** Cancels the external Oxlint process and rejects the lint operation. */
  signal?: AbortSignal
}

export async function lintDomain(options: LintDomainOptions = {}): Promise<LintResult> {
  const started = performance.now()
  const root = resolve(options.root ?? process.cwd())
  if (options.preflight !== false) await assertSingleTypeUniverse(root)
  const [project, oxlint] = await Promise.all([
    discoverProject(root),
    runOxlint(root, options.fix ?? false, { signal: options.signal }),
  ])
  const diagnostics = dedupeDiagnostics([...oxlint.diagnostics, ...analyzeProject(project)])
  return {
    root: project.root,
    diagnostics,
    files: Math.max(project.files.length, oxlint.files),
    durationMs: Math.max(0, Math.round(performance.now() - started)),
    exitCode: diagnostics.some((diagnostic) => diagnostic.severity === 'error') ? 1 : 0,
  }
}