package task

import (
	"encoding/json"
	"sort"
	"time"
	"fmt"
	"strconv"
	"strings"
	"log"
	"os"
	"os/exec"
	table "git.sealight.xyz/aynish/poms/table"
)

// Task representation.
type Task struct {
	Id          int     `json:"id"`
	Description string  `json:"description"`
	Tags        []string `json:"tags"`
	Project     string  `json:"project"`
	Status      string  `json:"status"`
	Uuid        string  `json:"uuid"`
	Urgency     float32 `json:"urgency"`
	Priority    string  `json:"priority"`
	Due         string  `json:"due"`
	End         string  `json:"end"`
	Entry       string  `json:"entry"`
	Modified    string  `json:"modified"`
}

func GetTasks() []Task {
	out, err := exec.Command("task", "(status:pending -backlog -BLOCKED -idea)", "export").Output()
	if err != nil {
		log.Fatal(err)
	}
	var tasks []Task
	err = json.Unmarshal([]byte(out), &tasks)
	if err != nil {
		log.Fatal(err)
	}
	sort.Slice(tasks, func(i, j int) bool {
		return tasks[i].Urgency > tasks[j].Urgency
	})
	return tasks
}

func TasksToRows(tasks []Task) []table.Row {
	rows := make([]table.Row, len(tasks))
	for i := 0; i < len(tasks); i++ {
		t := tasks[i]
		rows[i] = []string{strconv.Itoa(t.Id), t.Project, strings.Join(t.Tags[:], " "), t.Description} // fmt.Sprintf("%f", t.Urgency)
	}
	return rows
}

func RowsToFile(taskList []table.Row, activeIndex int) []string {
	var rows []string
	for index, row := range taskList {
		if index < activeIndex {
			// get uuid
			id := row[0]
			uuid_byte, err := exec.Command("task", "_get", id+".uuid").Output()
			if err != nil {
				log.Fatal(err)
			}
			uuid := string(uuid_byte[:len(uuid_byte)-1])

			// create task-note if it doesn't exist
			note_path := "/home/anish/kitaab/vimwiki/task-notes/" + uuid + ".wiki"
			if _, err := os.Stat(note_path); os.IsNotExist(err) {
				CreateTaskNote(note_path, row)
			}

			// link to task-note from pom-note
			rowClone := make(table.Row, len(row))
			_ = copy(rowClone, row)
			// TODO add links to indexs of EACH tag
			rowClone[2] = ""
			for _, tag := range strings.Split(row[2], " ") {
				rowClone[2] += "[[../indexs/" + tag + ".wiki|" + tag + "]]"
			}
			rowClone[3] = "[[../task-notes/" + uuid + ".wiki|" + row[3] + "]]"
			rows = append(rows, strings.Join(rowClone[1:], " - "))
		}
	}
	return rows
}

func CreateTaskNote(note_path string, row table.Row) {
	t := time.Now()
	f, err := os.Create(note_path)
	if err != nil {
		log.Fatal(err)
	}
	tags := strings.Replace(row[2], " ", ":", -1)
	tags = ":" + row[1] + ":" + tags + ":"
	fmt.Fprintln(f, "%title "+row[3])
	fmt.Fprintln(f, tags)
	fmt.Fprintln(f, "%date "+t.Format("2006-01-02 15:06"))
	fmt.Fprintln(f, "")
	defer f.Close()
}