import './utils/dotenv.js'
import 'dotenv/config'

import fs from 'node:fs/promises'
import { fileURLToPath } from 'node:url'

import { isFeatureEnabled } from '../../../packages/common/enabled-features/index.js'
import {
  fetchCliLibReferenceSource,
  fetchCSharpLibReferenceSource,
  fetchDartLibReferenceSource,
  fetchGuideSources,
  fetchJsLibReferenceSource,
  fetchKtLibReferenceSource,
  fetchPythonLibReferenceSource,
  fetchSwiftLibReferenceSource,
  type SearchSource,
} from './search/sources/index.js'

interface Source {
  title: string
  /**
   * Path relative to https://supabase.com. No leading slash
   */
  relPath: string
  fetch: () => Promise<SearchSource[]>
  enabled: boolean
}

const {
  sdkCsharp: sdkCsharpEnabled,
  sdkDart: sdkDartEnabled,
  sdkKotlin: sdkKotlinEnabled,
  sdkPython: sdkPythonEnabled,
  sdkSwift: sdkSwiftEnabled,
} = isFeatureEnabled(['sdk:csharp', 'sdk:dart', 'sdk:kotlin', 'sdk:python', 'sdk:swift'])

const SOURCES: Source[] = [
  {
    title: 'Supabase Guides',
    relPath: 'llms/guides.txt',
    fetch: fetchGuideSources,
    enabled: true,
  },
  {
    title: 'Supabase Reference (JavaScript)',
    relPath: 'llms/js.txt',
    fetch: async () =>
      (await fetchJsLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: true,
  },
  {
    title: 'Supabase Reference (Dart)',
    relPath: 'llms/dart.txt',
    fetch: async () =>
      (await fetchDartLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: sdkDartEnabled,
  },
  {
    title: 'Supabase Reference (Swift)',
    relPath: 'llms/swift.txt',
    fetch: async () =>
      (await fetchSwiftLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: sdkSwiftEnabled,
  },
  {
    title: 'Supabase Reference (Kotlin)',
    relPath: 'llms/kotlin.txt',
    fetch: async () =>
      (await fetchKtLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: sdkKotlinEnabled,
  },
  {
    title: 'Supabase Reference (Python)',
    relPath: 'llms/python.txt',
    fetch: async () =>
      (await fetchPythonLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: sdkPythonEnabled,
  },
  {
    title: 'Supabase Reference (C#)',
    relPath: 'llms/csharp.txt',
    fetch: async () =>
      (await fetchCSharpLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: sdkCsharpEnabled,
  },
  {
    title: 'Supabase CLI Reference',
    relPath: 'llms/cli.txt',
    fetch: async () =>
      (await fetchCliLibReferenceSource()).filter(
        (item): item is SearchSource => item !== undefined
      ),
    enabled: true,
  },
]

async function generateLlmsTxt() {
  try {
    await fs.mkdir('public/llms', { recursive: true })

    const enabledSources = SOURCES.filter((source) => source.enabled !== false)

    const fetchedSources = await Promise.all(
      enabledSources.map(async (sourceDefn) => {
        const source = await sourceDefn.fetch()
        const sourceText = source
          .map((section) => {
            section.process()
            return section.extractIndexedContent()
          })
          .join('\n\n')
        return { defn: sourceDefn, text: sourceText }
      })
    )

    await Promise.all(
      fetchedSources.map(({ defn, text }) =>
        fs.writeFile(`public/${defn.relPath}`, `${defn.title}\n\n${text}`)
      )
    )
  } catch (err) {
    console.error(err)
    throw err
  }
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  generateLlmsTxt()
}

export { generateLlmsTxt, SOURCES }