// Data and interface definitions for bugs
//
// TODO strip last newline from [issues.Issue] [issues.Field] and [issues.VariadicField]
package issues

import (
	"os"
	"path/filepath"
	"strings"
)

// Issue Definitions ------------------------------------------------------------
// ----------------------------------------------------------------------------

type Issue struct {
	Title       string        // The title of the bug in human readable format
	Description Field         // The description of the bug
	Status      Field         // The status of the bug
	Tags        VariadicField // A slice of VariadicFields
	Blockedby   VariadicField // A slice of VariadicFields
	Path        string        // The path to the bug

	// machineTitle string        // The machine parseable bug title
}

// Constrcutor for Issues
func (i Issue) New(title string, status Field, tags VariadicField, blockedby VariadicField, path string) (issue Issue, err error) {
	return Issue{
		Title:     title,
		Status:    status,
		Tags:      tags,
		Blockedby: blockedby,
		Path:      path,
	}, err
}

// Constrcutor for Issues that loads relevant data from disk
func (i Issue) NewFromPath(path string) (bug Issue, err error) {
	// Required Fields
	description := &Field{Path: "/description"}
	status := &Field{Path: "/status"}
	requiredFields := []*Field{description, status}

	for _, field := range requiredFields {
		data, err := readPath(path + field.Path)
		if err != nil {
			return Issue{}, err
		}

		field.Data = data
	}

	// Variadic Fields
	tags := VariadicField{Path: "/tags"}
	blockers := VariadicField{Path: "/blockedby"}

	tags, _ = VariadicField.NewFromPath(tags, path)
	blockers, _ = VariadicField.NewFromPath(blockers, path)
	// we can ignore the errors, as loadVariadicField already gracefully handles
	//them.

	// title from path
	title := parsePathToHuman(path)

	return Issue{
		Title:       title,
		Description: *description,
		Status:      *status,
		Tags:        tags,
		Blockedby:   blockers,
		Path:        path,
	}, err
}

// Field Definitions ----------------------------------------------------------
// ----------------------------------------------------------------------------

// A struct representing data that is tied to data on disk
type Field struct {
	Path string
	Data string
}

// Constructor for Fields
func (f Field) New(data string, path string) Field { return Field{Data: data, Path: path} }

// VariadicField Definitions --------------------------------------------------
// ----------------------------------------------------------------------------

// VariadicFields hold lists of Field objects.
type VariadicField struct {
	Path   string  // The associated path on disk of Fields represented by Variadic Field
	Fields []Field // The underlying slice of Field objects
}

// Constructor for VariadicFields
func (vf VariadicField) New(fields []Field, path string) VariadicField {
	return VariadicField{Fields: fields, Path: path}
}

// Constructor for VariadicFields that loads relevant data from disk
func (vf VariadicField) NewFromPath(pathOnDisk string) (v VariadicField, err error) {
	rootPath := pathOnDisk + "/" + vf.Path

	files, err := os.ReadDir(rootPath)
	if err != nil {
		return vf, err
	}

	for _, file := range files {
		data, err := readPath(rootPath + "/" + file.Name())
		if err != nil {
			return vf, err
		}
		if file.Name()[0:1] == "." {
			continue
		}

		vf.Fields = append(vf.Fields, Field{Data: data, Path: file.Name()})
	}

	return vf, err
}

// Util Definitions -----------------------------------------------------------
// ----------------------------------------------------------------------------

// Parses human readable strings as path strings
func parseHumanToPath(humanReadable string) string {
	var out string
	out = strings.ReplaceAll(humanReadable, "-", "\\replace/")
	out = strings.ReplaceAll(out, " ", "-")
	out = strings.ReplaceAll(out, "\\replace/", "--")

	return out
}

// Parses machine parseable paths as human readable strings
func parsePathToHuman(path string) string {
	_, last := filepath.Split(filepath.Clean(path))
	last = strings.ReplaceAll(last, "--", "\\replace/")
	last = strings.ReplaceAll(last, "-", " ")
	last = strings.ReplaceAll(last, "\\replace/", "-")

	return last
}