package fzf

import (
	"fmt"
	"os/exec"
)

const zellijBorderLabelEnv = internalEnvPrefix + "ZELLIJ_LABEL_PANE"

// Errors are ignored. The pane may be gone
func setZellijBorderLabel(pane string, label string) {
	// Strip ANSI sequences fzf would otherwise render itself
	label, _, _ = extractColor(label, nil, nil)
	// '--' so that a label starting with a hyphen is not parsed as a flag
	exec.Command("zellij", "action", "rename-pane", "-p", pane, "--", label).Run()
}

func runZellij(args []string, opts *Options) (int, error) {
	// Use the native Zellij border by default, consistent with tmux, so that
	// the pane can be moved and resized with the mouse. Set before
	// popupArgStr so that it does not inject an fzf border. fzf draws its own
	// border instead when a border style is explicitly specified.
	if nativeBorder(opts) {
		opts.Tmux.border = true
	}
	argStr, dir := popupArgStr(args, opts)

	zellijArgs := []string{
		"run", "--floating", "--close-on-exit", "--block-until-exit",
		"--cwd", dir,
	}
	ownsLabel := false
	if !opts.Tmux.border {
		zellijArgs = append(zellijArgs, "--borderless", "true")
	} else {
		// Set --border-label as the name of the pane, displayed on the
		// native border. The label is left to fzf when it draws its own
		// border with the label on it (border-native with an explicit
		// --border style). Empty otherwise, to override the default name
		// (the running command). Passed as a single argument in the
		// --name=label form; the detached form fails to parse when the
		// label starts with a hyphen. No escaping is needed beyond
		// stripping ANSI sequences fzf would otherwise render itself.
		// --border-label-pos is ignored.
		label := ""
		ownsLabel = noBorderSpecified(opts)
		if ownsLabel {
			label, _, _ = extractColor(opts.BorderLabel.label, nil, nil)
		}
		zellijArgs = append(zellijArgs, "--name="+label)
	}
	switch opts.Tmux.position {
	case posUp:
		zellijArgs = append(zellijArgs, "-y", "0")
	case posDown:
		zellijArgs = append(zellijArgs, "-y", "9999")
	case posLeft:
		zellijArgs = append(zellijArgs, "-x", "0")
	case posRight:
		zellijArgs = append(zellijArgs, "-x", "9999")
	case posCenter:
		// Zellij centers floating panes by default
	}
	zellijArgs = append(zellijArgs, "--width", opts.Tmux.width.String())
	zellijArgs = append(zellijArgs, "--height", opts.Tmux.height.String())
	zellijArgs = append(zellijArgs, "--")

	return runProxy(argStr, func(temp string, needBash bool) (*exec.Cmd, error) {
		sh, err := sh(needBash)
		if err != nil {
			return nil, err
		}
		if ownsLabel {
			// 'zellij run' cannot set the new pane's environment, so the
			// command exports it itself. exec avoids a lingering shell
			zellijArgs = append(zellijArgs, sh, "-c", fmt.Sprintf(`export %s="$ZELLIJ_PANE_ID"; exec %s %s`,
				zellijBorderLabelEnv, escapeSingleQuote(sh), escapeSingleQuote(temp)))
		} else {
			zellijArgs = append(zellijArgs, sh, temp)
		}
		return exec.Command("zellij", zellijArgs...), nil
	}, opts, true)
}