package format

import (
	"fmt"
	"os"
	"os/exec"
	"strconv"
	"strings"

	"go-mod.ewintr.nl/gte/internal/task"
)

func FormatTaskTable(tasks []*task.LocalTask, cols []Column) string {
	if len(tasks) == 0 {
		return "no tasks to display\n"
	}

	var data [][]string
	for _, t := range tasks {
		var line []string
		for _, col := range cols {
			switch col {
			case COL_ID:
				line = append(line, fmt.Sprintf("%d", t.LocalId))
			case COL_STATUS:
				var updated []string
				if t.IsRecurrer() {
					updated = append(updated, "r")
				}
				if t.LocalStatus == task.STATUS_UPDATED {
					updated = append(updated, "u")
				}
				if !t.Due.IsZero() && task.Today().After(t.Due) {
					updated = append(updated, "o")
				}
				line = append(line, strings.Join(updated, " "))
			case COL_DUE:
				if t.Due.IsZero() {
					line = append(line, "")
					continue
				}
				line = append(line, t.Due.Human())
			case COL_ACTION:
				line = append(line, t.Action)
			case COL_PROJECT:
				line = append(line, t.Project)
			}
		}
		data = append(data, line)
	}

	return fmt.Sprintf("\n%s\n", FormatTable(data))
}

func FormatTable(data [][]string) string {
	if len(data) == 0 {
		return ""
	}

	// make all cells in a column the same width
	max := make([]int, len(data[0]))
	for _, row := range data {
		for c, cell := range row {
			if len(cell) > max[c] {
				max[c] = len(cell)
			}
		}
	}
	for r, row := range data {
		for c, cell := range row {
			for s := len(cell); s < max[c]; s++ {
				data[r][c] += " "
			}
		}
	}

	// make it smaller if the result is too wide
	// only by making the widest column smaller for now
	maxWidth := findTermWidth()
	if maxWidth != 0 {
		width := len(max) - 1
		for _, m := range max {
			width += m
		}
		shortenWith := width - maxWidth
		widestColNo, widestColLen := 0, 0
		for i, m := range max {
			if m > widestColLen {
				widestColNo, widestColLen = i, m
			}
		}
		newTaskColWidth := max[widestColNo] - shortenWith
		if newTaskColWidth < 0 {
			return "table is too wide to display\n"
		}
		if newTaskColWidth < max[widestColNo] {
			for r, row := range data {
				data[r][widestColNo] = row[widestColNo][:newTaskColWidth]
			}
		}
	}

	// print the rows
	var output string
	for r, row := range data {
		if r%3 == 0 {
			output += fmt.Sprintf("%s", "\x1b[48;5;237m")
		}
		for c, col := range row {
			output += col
			if c != len(row)-1 {
				output += " "
			}
		}
		if r%3 == 0 {
			output += fmt.Sprintf("%s", "\x1b[49m")
		}
		output += "\n"
	}

	return output
}

func findTermWidth() int {
	cmd := exec.Command("stty", "size")
	cmd.Stdin = os.Stdin
	out, err := cmd.Output()
	if err != nil {
		return 0
	}

	s := string(out)
	s = strings.TrimSpace(s)
	sArr := strings.Split(s, " ")

	width, err := strconv.Atoi(sArr[1])
	if err != nil {
		return 0
	}
	return width
}