import { loadConfig } from "c12"
import path from "node:path"
import z from "zod"
import {
  findUnambiguousConfigDirMatch,
  type FindConfigDirMatchesOptions,
} from "./config-dir"

/** Schema for the project identifier stored in a Automate.ax config file. */
const projectConfigSchema = z.object({
  projectId: z.string(),
})

/**
 * Loads and validates a project's Automate.ax configuration file.
 *
 * @param configPath - Absolute path to the configuration file.
 * @throws When the file cannot be loaded or its contents are invalid.
 */
export async function loadProjectConfig(configPath: string) {
  const { config } = await loadConfig<z.infer<typeof projectConfigSchema>>({
    configFile: path.basename(configPath),
    configFileRequired: true,
    cwd: path.dirname(configPath),
  })

  return projectConfigSchema.parse(config)
}

/**
 * Loads the nearby project config when directory discovery is unambiguous.
 *
 * @param options - Config directory search options.
 */
export async function findProjectConfig(
  options: FindConfigDirMatchesOptions = {},
) {
  const match = await findUnambiguousConfigDirMatch(options)
  return match ? loadProjectConfig(match.configPath) : undefined
}