package cmd

import (
	"errors"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"gitlab.sweetwater.com/it/devops/tools/gitlab-project-manager/internal/gitlab"
)

var projectOpenCmd = &cobra.Command{
	Use:               "open [fuzzy alias search]",
	Short:             "Open project in your IDE",
	Aliases:           []string{"goto", "cd"},
	Args:              cobra.MaximumNArgs(1),
	ArgAliases:        []string{"project"},
	ValidArgsFunction: validAliasesFunc,
	Long:              projOpenCmdLong,
	Run:               projectOpenCmdRun,
}

var knownEditors = []string{
	"vim",
	"emacs",
	"code",
	"codium",
	"/Applications/GoLand.app/Contents/MacOS/goland",
}

var entrypointFiles = []string{
	"README.md",
	"README",
	"main.go",
	"main.py",
	"app.py",
	"index.php",
	"server.php",
	"index.js",
	"app.js",
	"server.js",
	"app.ts",
	"main.c",
	"main.cpp",
}

func projectOpenCmdRun(cmd *cobra.Command, args []string) {
	// Find an editor
	editor := findEditor()
	if editor == "" {
		plog.Fatal("No usable editor found")
	}

	// Identify search terms
	var searchTerm string
	if len(args) > 0 {
		searchTerm = args[0]
	}

	// Try to open local project
	var project *gitlab.Project
	if searchTerm == "." {
		project, _ = cache.GetProjectFromCwd()
	}

	// Find a project if not local
	if project == nil {
		project = fzfSearchProjectAliases(searchTerm)
		if project == nil {
			plog.Fatal("No project to open, nothing to do")
		}
	}

	// Check the project
	path := cache.GetProjectPath(project)
	if _, err := os.Stat(path); err != nil {
		plog.Fatal("Unable to open project", plog.Args("error", err))
	}

	// Open the project with the editor
	file := getEntrypointFile(path)
	openEditor(editor, path+"/"+file)
}

func openEditor(editor string, path string) {
	// Compile arguments
	args := make([]string, 0, 1)
	if conf.Editor.OpenFlags != "" {
		args = append(args, conf.Editor.OpenFlags)
	}
	args = append(args, path)

	// Launch editor
	cmd := exec.CommandContext(rootCmd.Context(), editor, args...)
	cmd.Dir = filepath.Dir(path)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	if err := cmd.Run(); err != nil {
		plog.Error("Failed to open project", plog.Args(
			"error", err.Error(),
			"command", cmd.String(),
		))
	}

	cmd.Wait()
}

func getEntrypointFile(projectPath string) string {
	if err := os.Chdir(projectPath); err != nil {
		return ""
	}
	for _, f := range entrypointFiles {
		if _, err := os.Stat(f); err == nil {
			return f
		}
	}
	return ""
}

func findEditor() string {
	var editor string
	var err error

	// First try configured editor
	if conf.Editor.Binary != "" {
		editor, err = getEditor(conf.Editor.Binary)
		if err != nil || editor == "" {
			plog.Error("Configured editor is not usable, finding others", plog.Args(
				"error", err,
			))
		}
	}

	// Then try to find a known editor
	if editor == "" || err != nil {
		conf.Editor.OpenFlags = ""
		for _, e := range knownEditors {
			path, err := getEditor(e)
			if err == nil && path != "" {
				editor = path
				break
			}
		}
	}

	plog.Debug("Editor found for open", plog.Args(
		"editor", editor,
		"command", editor+" "+conf.Editor.OpenFlags,
	))

	return editor
}

func getEditor(editor string) (string, error) {
	path, err := getEditorPath(editor)
	if path != "" && err == nil {
		if !isEditorExecutable(path) {
			err = errors.New("Editor is not executable")
		}
	}
	return path, err
}

func getEditorPath(editor string) (string, error) {
	// Check path first
	if editor[0] != '/' {
		editor, _ = exec.LookPath(editor)
	}

	return resolvePath(editor)
}

func isEditorExecutable(editor string) bool {
	var canExec bool

	stat, err := os.Stat(editor)

	if err == nil && (stat.Mode()&0444 != 0 && stat.Mode()&0111 != 0) {
		canExec = true
	}

	return canExec
}

func init() {
	projectCmd.AddCommand(projectOpenCmd)
	projectOpenCmd.PersistentFlags().String("displayName", "", "Set display name of editor (meant for config file)")
	projectOpenCmd.PersistentFlags().String("binary", "", "Path to editor binary")
	projectOpenCmd.PersistentFlags().String("openFlags", "", "Optional flags when opening project (e.g. --reuse-window)")
	viper.BindPFlag("editor.displayName", projectOpenCmd.Flag("displayName"))
	viper.BindPFlag("editor.binary", projectOpenCmd.Flag("binary"))
	viper.BindPFlag("editor.openFlags", projectOpenCmd.Flag("openFlags"))
}