package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"os"
	"strings"
	"text/template"
)

type deleteInfo struct {
	baseType   string
	targetType string
	path       string
}

var deleteFuncs = map[string][]*deleteInfo{
	"scopes": {
		{
			"Scope",
			"Scope",
			"scopes",
		},
	},
	"authtokens": {
		{
			"AuthToken",
			"AuthToken",
			"auth-tokens",
		},
	},
	"groups": {
		{
			"Group",
			"Group",
			"groups",
		},
	},
	"users": {
		{
			"User",
			"User",
			"users",
		},
	},
	"roles": {
		{
			"Role",
			"Role",
			"roles",
		},
	},
}

func writeDeleteFuncs() {
	for outPkg, funcs := range deleteFuncs {
		outFile := os.Getenv("GEN_BASEPATH") + fmt.Sprintf("/api/%s/delete.gen.go", outPkg)
		outBuf := bytes.NewBuffer([]byte(fmt.Sprintf(
			`// Code generated by "make api"; DO NOT EDIT.
package %s
`, outPkg)))
		for _, deleteInfo := range funcs {
			deleteFuncTemplate.Execute(outBuf, struct {
				BaseType   string
				TargetType string
				TargetName string
				Path       string
			}{
				BaseType:   deleteInfo.baseType,
				TargetType: deleteInfo.targetType,
				TargetName: strings.Split(deleteInfo.targetType, ".")[strings.Count(deleteInfo.targetType, ".")],
				Path:       deleteInfo.path,
			})
		}
		if err := ioutil.WriteFile(outFile, outBuf.Bytes(), 0644); err != nil {
			fmt.Printf("error writing file %q: %v\n", outFile, err)
			os.Exit(1)
		}
	}
}

var deleteFuncTemplate = template.Must(template.New("").Parse(
	`
// Delete{{ .TargetName }} returns true iff the {{ .TargetType }} existed when the delete attempt was made. 
func (s {{ .BaseType }}) Delete{{ .TargetName }}(ctx context.Context, id string) (bool, *api.Error, error) {
	if id == "" {
		return false, nil, fmt.Errorf("empty id provided to Delete{{ .TargetName }} request")
	}

	if s.Client == nil {
		return false, nil, fmt.Errorf("nil client in Delete{{ .TargetName }} request")
	}
	
	var opts []api.Option
	if s.Scope.Id != "" {
		// If it's explicitly set here, override anything that might be in the
		// client
		opts = append(opts, api.WithScopeId(s.Scope.Id))
	}
	
	req, err := s.Client.NewRequest(ctx, "DELETE", fmt.Sprintf("%s/%s", "{{ .Path }}", id), nil, opts...)
	if err != nil {
		return false, nil, fmt.Errorf("error creating Delete{{ .TargetName }} request: %w", err)
	}

	resp, err := s.Client.Do(req)
	if err != nil {
		return false, nil, fmt.Errorf("error performing client request during Delete{{ .TargetName }} call: %w", err)
	}

	type deleteResponse struct {
		Existed bool
	}
	target := &deleteResponse{}

	apiErr, err := resp.Decode(target)
	if err != nil {
		return false, nil, fmt.Errorf("error decoding Delete{{ .TargetName }} repsonse: %w", err)
	}

	return target.Existed, apiErr, nil
}
`))