roadmap.git

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package main

import (
	"embed"
	"errors"
	"fmt"
	"html/template"
	"io/fs"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"slices"
	"strings"

	"github.com/rveen/ogdl"
)

//go:embed templates
var templatesFs embed.FS

type Task struct {
	Path        string
	Summary     string
	Status      string
	Assignee    string
	Tags        string
	Statuses    []string
	Description string
	Priority    int64
	Milestone   string

	Subtasks map[string][]Task
}

func (t Task) SubtasksMap(status string) []Task {
	slices.SortFunc(t.Subtasks[status], func(a, b Task) int {
		return int(a.Priority) - int(b.Priority)
	})
	return t.Subtasks[status]
}

func main() {
	base := ""
	if len(os.Args) < 2 {
		// TODO error
		os.Exit(1)
	} else {
		base = os.Args[1]
	}

	base = filepath.Clean(base)
	router(base)
}

func router(base string) {
	http.HandleFunc("/favicon.ico", func(rw http.ResponseWriter, r *http.Request) {
		rw.WriteHeader(404)
	})
	http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
		status := renderTasks(base, filepath.Clean(r.URL.Path), rw)
		if status != 200 {
			rw.WriteHeader(status)
		}
	})

	http.ListenAndServe(":8080", nil)
}

func renderTasks(base, path string, rw http.ResponseWriter) int {
	if path == "/" {
		t, err := root(base)
		if err != nil {
			log.Printf("while getting task %s: %v", path, err)
			return 500 // TODO get status from error
		}
		tmpl, err := template.ParseFS(templatesFs, "templates/root.html") // TODO create template
		if err != nil {
			log.Printf("while parsing template: %v", err)
			return 500
		}
		tmpl.Execute(rw, t)
		return 200
	} else {
		t, err := task(base, path)
		if err != nil {
			log.Printf("while getting task %s: %v", path, err)
			return 500 // TODO get status from error
		}
		tmpl, err := template.ParseFS(templatesFs, "templates/task.html")
		if err != nil {
			log.Printf("while parsing template: %v", err)
			return 500
		}
		tmpl.Execute(rw, t)
		return 200
	}
}

func root(base string) ([]Task, error) {
	tasks := []Task{}
	dirEntries, err := os.ReadDir(base)
	if err != nil {
		log.Printf("while reading dir: %v", err)
		os.Exit(1)
	}

	for _, dirEntry := range dirEntries {
		if !dirEntry.IsDir() {
			task, err := readTask(base, dirEntry.Name())
			if err != nil {
				return []Task{}, fmt.Errorf("while reading dir: %v", err)
			}
			tasks = append(tasks, task)
		}
	}
	return tasks, nil
}

func task(base, path string) (Task, error) {
	middleTasks := strings.Split(path, "/")[1:]
	middleTasks = middleTasks[:len(middleTasks)-1]
	statuses := []string{}
	middlePath := ""
	for _, name := range middleTasks {
		middlePath = middlePath + "/" + name
		t, err := readTask(base, middlePath+".ogdl")
		if err != nil {
			return Task{}, fmt.Errorf("while reading middle task %s: %v", path, err)
		}
		if len(t.Statuses) > 0 {
			statuses = t.Statuses
		}
	}
	task, err := readTask(base, path+".ogdl")
	if err != nil {
		return Task{}, fmt.Errorf("while reading task %s: %v", path, err)
	}
	if len(task.Statuses) == 0 {
		task.Statuses = statuses
	}
	dirEntries, err := os.ReadDir(filepath.Join(base, path))
	if err != nil {
		if errors.Is(err, fs.ErrNotExist) {
			return task, nil
		}
		return Task{}, fmt.Errorf("while reading dir: %v", err)
	}
	task.Subtasks = map[string][]Task{}
	for _, dirEntry := range dirEntries {
		if !dirEntry.IsDir() {
			subtask, err := readTask(base, filepath.Join(path, dirEntry.Name()))
			if err != nil {
				return Task{}, fmt.Errorf("while reading subtask %s: %v", path, err)
			}
			subtasks := task.Subtasks[subtask.Status]
			subtasks = append(subtasks, subtask)
			task.Subtasks[subtask.Status] = subtasks
		}
	}
	return task, nil
}

func readTask(base, path string) (Task, error) {
	g := ogdl.FromFile(filepath.Join(base, path))
	if g == nil {
		return Task{}, fmt.Errorf("no such task: %s", path)
	}
	summary := g.String()
	g = g.Out[0]
	tags := strings.Join(getArray(g.Get("tags")), ", ")
	return Task{
		Path:        strings.ReplaceAll(path, ".ogdl", ""),
		Summary:     summary,
		Status:      g.Get("status").String(),
		Statuses:    getArray(g.Get("statuses")), // TODO inherit
		Assignee:    g.Get("assignee").String(),
		Description: g.Get("description").String(),
		Tags:        tags,
		Priority:    g.Get("priority").Int64(),
		Milestone:   g.Get("milestone").String(),
	}, nil
}

func getArray(g *ogdl.Graph) []string {
	if g.Len() < 1 {
		return []string{}
	}
	array := make([]string, g.Len())
	for i, o := range g.Out {
		array[i] = o.ThisString()
	}
	return array
}