package jobspec

import (
	"fmt"
	"strings"

	"github.com/hashicorp/hcl/v2"
	"github.com/hashicorp/hcl/v2/gohcl"
	"github.com/hashicorp/hcl/v2/hclsimple"
)

// Spec is the legacy HCL-only jobspec shape. It is retained for the
// v0.9→v0.10 migration window (REQ-090) and is populated by ParseHCLLegacy.
//
// Deprecated: HCL is legacy per R-013; new code should consume the
// unified *WorkloadSpec returned by ParseFile/Dispatch (see
// dispatch.go and markdown.go).
type Spec struct {
	Job   JobSpec    `hcl:"job,block"`
	Tasks []TaskSpec `hcl:"task,block"`
}

// JobSpec is the legacy HCL job block.
type JobSpec struct {
	Name string `hcl:"name,label"`
	Type string `hcl:"type,optional"`
}

// TaskSpec is the legacy HCL task block.
type TaskSpec struct {
	Name    string   `hcl:"name,label"`
	Command string   `hcl:"command"`
	Args    []string `hcl:"args,optional"`
	Env     []string `hcl:"env,optional"`
}

// hclDecode wraps hclsimple.Decode for testability.
func hclDecode(filename string, data []byte, spec *Spec) error {
	return hclsimple.Decode(filename, data, nil, spec)
}

// Validate is the legacy HCL Spec validator retained for the migration
// window (REQ-090). New code should use validateWorkload on a
// *WorkloadSpec.
func (s *Spec) Validate() error {
	if strings.TrimSpace(s.Job.Name) == "" {
		return fmt.Errorf("job name is required")
	}
	if len(s.Tasks) == 0 {
		return fmt.Errorf("at least one task is required")
	}
	return nil
}

// Parse is the original HCL-only entry point retained for backward
// compatibility with direct HCL callers during the v0.9→v0.10 migration
// window (REQ-090). New code should call the dispatcher ParseFile (which
// returns *WorkloadSpec) or ParseHCL (which adapts HCL into
// *WorkloadSpec).
//
// Deprecated: use ParseFile (dispatcher) or ParseHCL (adapter). HCL is
// legacy per R-013.
func Parse(data []byte, filename string) (*Spec, error) {
	return ParseHCLLegacy(data, filename)
}

var _ = hcl.Diagnostics{}
var _ = gohcl.DecodeBody