package wails

import (
	"context"
	"fmt"
	"regexp"
	"strings"

	"lmika.dev/actions/wails-release/internal/runner"
)

var cliVersionRE = regexp.MustCompile(`v\d+\.\d+\.\d+`)

// ParseCLIVersion extracts the version from `wails -v` output.
func ParseCLIVersion(out []byte) (string, error) {
	m := cliVersionRE.FindString(strings.TrimSpace(string(out)))
	if m == "" {
		return "", fmt.Errorf("could not parse Wails CLI version from %q", string(out))
	}
	return m, nil
}

// EnsureCLI installs the Wails CLI at `want` (e.g. "v2.11.0") if it is not
// already installed at exactly that version.
func EnsureCLI(ctx context.Context, r runner.Runner, want string) error {
	out, err := r.Run(ctx, runner.Spec{Name: "wails", Args: []string{"-v"}})
	if err == nil {
		got, perr := ParseCLIVersion(out)
		if perr == nil && got == want {
			return nil
		}
	}
	_, err = r.Run(ctx, runner.Spec{
		Name: "go",
		Args: []string{"install", "github.com/wailsapp/wails/v2/cmd/wails@" + want},
	})
	if err != nil {
		return fmt.Errorf("install wails CLI %s: %w", want, err)
	}
	return nil
}