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// Shared helper for running capnpc-capnp on .capnp schema files.
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// Used by next-capnp-ordinal and compat-date-at tools.
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import path from 'path';
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/**
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 * Run capnpc-capnp on a .capnp file and return the canonical text output.
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 *
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 * Automatically locates the bazel-built capnp tools, building them if needed.
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 * Includes standard import paths for workerd's capnp files.
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 *
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 * @param root - Project root directory (ctx.worktree or ctx.directory)
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 * @param filePath - Absolute path to the .capnp file
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 * @returns The canonical schema text, or an error string prefixed with "Error:"
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 */
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export async function runCapnpcCapnp(
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  root: string,
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  filePath: string
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): Promise<string | { error: string }> {
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  const capnp = path.join(
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    root,
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    'bazel-bin/external/+http+capnp-cpp/src/capnp/capnp_tool'
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  );
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  const capnpcCapnp = path.join(
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    root,
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    'bazel-bin/external/+http+capnp-cpp/src/capnp/capnpc-capnp'
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  );
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  const importPath = path.join(
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    root,
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    'bazel-workerd/external/+http+capnp-cpp/src'
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  );
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  // Check tools exist, build if needed
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  try {
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    await Bun.$`test -x ${capnp} && test -x ${capnpcCapnp}`.quiet();
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  } catch {
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    try {
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      await Bun.$`bazel build @capnp-cpp//src/capnp:capnp_tool @capnp-cpp//src/capnp:capnpc-capnp`
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        .cwd(root)
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        .quiet();
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    } catch {
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      return {
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        error:
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          'Could not build capnp tools. Run:\n  bazel build @capnp-cpp//src/capnp:capnp_tool @capnp-cpp//src/capnp:capnpc-capnp',
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      };
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    }
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  }
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  const fileDir = path.dirname(filePath);
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  const importArgs = [
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    '--no-standard-import',
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    `-I${importPath}`,
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    `-I${fileDir}`,
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    `-I${path.join(root, 'src/workerd/io')}`,
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    `-I${path.join(root, 'src/workerd/server')}`,
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    `-I${path.join(root, 'src')}`,
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  ];
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  try {
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    return await Bun.$`${capnp} compile ${importArgs} -o${capnpcCapnp} ${filePath}`
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      .cwd(root)
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      .text();
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  } catch (e: any) {
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    return { error: `capnpc-capnp failed:\n${e.stderr || e.message}` };
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  }
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}
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/**
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 * Resolve a .capnp file path (absolute or relative to project root).
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 */
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export function resolveCapnpPath(root: string, file: string): string {
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  return path.isAbsolute(file) ? file : path.join(root, file);
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}