package main

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"time"
)

func requireST() error {
	if _, err := exec.LookPath("st"); err != nil {
		return fmt.Errorf("st is required for wayland discussion")
	}
	return nil
}

func requireNvim() error {
	if _, err := exec.LookPath("nvim"); err != nil {
		return fmt.Errorf("nvim is required for wayland discussion")
	}
	return nil
}

func runDiscussionWayland(ctx context.Context, text string) error {
	if err := requireST(); err != nil {
		return err
	}
	if err := requireNvim(); err != nil {
		return err
	}
	if _, err := exec.LookPath("swaymsg"); err != nil {
		return fmt.Errorf("swaymsg is required for wayland discussion")
	}

	tmpPath, cleanup, err := makeAFDTempFile(text)
	if err != nil {
		return err
	}
	defer cleanup()

	cmd := exec.CommandContext(ctx, "st", "-n", "scratch", "-e", "nvim", tmpPath)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Start(); err != nil {
		return err
	}

	time.Sleep(150 * time.Millisecond)
	_ = exec.CommandContext(ctx, "swaymsg", "[instance=\"scratch\"]", "move", "to", "scratchpad").Run()
	_ = exec.CommandContext(ctx, "swaymsg", "[instance=\"scratch\"]", "scratchpad", "show").Run()

	err = cmd.Wait()
	return err
}

func makeAFDTempFile(text string) (string, func(), error) {
	base := os.Getenv("XDG_CACHE_HOME")
	if base == "" {
		base = os.TempDir()
	}
	dir := filepath.Join(base, "weather")
	if err := os.MkdirAll(dir, 0o755); err != nil {
		return "", nil, err
	}
	file, err := os.CreateTemp(dir, "afd-*.md")
	if err != nil {
		return "", nil, err
	}
	path := file.Name()
	if _, err := file.WriteString(text); err != nil {
		_ = file.Close()
		_ = os.Remove(path)
		return "", nil, err
	}
	if err := file.Close(); err != nil {
		_ = os.Remove(path)
		return "", nil, err
	}
	cleanup := func() {
		_ = os.Remove(path)
	}
	return path, cleanup, nil
}