import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { afterEach, describe, expect, it } from 'vitest'
import { DEFAULTS, getConfig, getThemeCss, resolveConfig } from '../src/main/config'

let dir = ''
afterEach(async () => { if (dir) await rm(dir, { recursive: true, force: true }) })

describe('resolveConfig', () => {
  it('creates config.default.json + theme.css and yields defaults for a fresh project', async () => {
    dir = await mkdtemp(join(tmpdir(), 'helder-cfg-'))
    await resolveConfig(dir)

    const def = JSON.parse(await readFile(join(dir, '.helder/config.default.json'), 'utf8'))
    expect(def).toEqual(DEFAULTS)
    const theme = await readFile(join(dir, '.helder/theme.css'), 'utf8')
    expect(theme).toContain('--code-font')
    expect(getConfig().ai.command).toBe('claude')
    expect(getThemeCss()).toContain('Helder theme')
  })

  it('deep-merges a sparse config.json over defaults', async () => {
    dir = await mkdtemp(join(tmpdir(), 'helder-cfg-'))
    await resolveConfig(dir)
    await writeFile(join(dir, '.helder/config.json'),
      JSON.stringify({ ai: { command: 'claude --model opus' }, editor: { tabSize: 2 } }))
    await resolveConfig(dir)

    const c = getConfig()
    expect(c.ai.command).toBe('claude --model opus') // overridden
    expect(c.ai.autoLaunch).toBe(true)                // default kept
    expect(c.editor.tabSize).toBe(2)                  // overridden
    expect(c.editor.autoSave).toBe(false)             // default kept
    expect(c.git.confirmDiscard).toBe(true)           // default kept
  })

  it('always regenerates config.default.json with full built-in defaults', async () => {
    dir = await mkdtemp(join(tmpdir(), 'helder-cfg-'))
    await resolveConfig(dir)
    await writeFile(join(dir, '.helder/config.json'), JSON.stringify({ ai: { command: 'x' } }))
    await resolveConfig(dir)
    const def = JSON.parse(await readFile(join(dir, '.helder/config.default.json'), 'utf8'))
    expect(def.ai.command).toBe('claude')
  })

  it('does not overwrite an existing theme.css', async () => {
    dir = await mkdtemp(join(tmpdir(), 'helder-cfg-'))
    await resolveConfig(dir)
    await writeFile(join(dir, '.helder/theme.css'), ':root{--accent:#ff0000}')
    await resolveConfig(dir)
    expect(getThemeCss()).toContain('#ff0000')
  })
})