package owners

import (
	"regexp"

	"edge-infra.dev/pkg/f8n/devinfra/repo/owners/policybot/policy/approval"
	"edge-infra.dev/pkg/f8n/devinfra/repo/owners/policybot/policy/common"
	"edge-infra.dev/pkg/f8n/devinfra/repo/owners/policybot/policy/predicate"
)

const (
	FileName = "OWNERS"
	Regex    = `.*`
)

// File defines the structure of the OWNERS files used to manage code
// ownership for a repository.
type File struct {
	// Approval is an array of Policy-bot apporval policies: https://github.com/palantir/policy-bot#approval-policies
	Approval []interface{} `yaml:"approval"`

	// Rules is an array of Policy-bot approval rules: https://github.com/palantir/policy-bot#approval-rules
	Rules []*approval.Rule `yaml:"rules"`
}

func DefaultFile(users, teams []string, path string) *File {
	rules := []*approval.Rule{}
	rule := &approval.Rule{
		Name: path,
		Predicates: predicate.Predicates{
			ChangedFiles: &predicate.ChangedFiles{
				Paths: []common.Regexp{common.NewCompiledRegexp(regexp.MustCompile(Regex))},
			},
		},
		Requires: approval.Requires{
			Count: 1,
			Actors: common.Actors{
				Users: users,
				Teams: teams,
			},
		},
	}
	rules = append(rules, rule)

	return &File{
		Rules: rules,
		Approval: []interface{}{
			path,
		},
	}
}