package contracts

import (
	"embed"
	"encoding/json"
	"fmt"
	"path"
)

// Files is the immutable contract bundle imported from the parent repository.
// The bundle is copied from a recorded parent commit; runtime code never reads
// the parent worktree.
//
//go:embed upstream
var Files embed.FS

const SourceCommit = "2026-09-19-p1-v1"

func Read(name string) ([]byte, error) {
	return Files.ReadFile(path.Join("upstream", SourceCommit, name))
}

func ReadJSON(name string, dst any) error {
	data, err := Read(name)
	if err != nil {
		return fmt.Errorf("read contract %s: %w", name, err)
	}
	if err := json.Unmarshal(data, dst); err != nil {
		return fmt.Errorf("decode contract %s: %w", name, err)
	}
	return nil
}