package cmd

import (
	"fmt"
	"io/fs"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"

	makeshift "git.towk2.me/towk/makeshift/pkg"
	"git.towk2.me/towk/makeshift/pkg/client"
	"git.towk2.me/towk/makeshift/pkg/service"
	"github.com/rs/zerolog/log"
	"github.com/spf13/cobra"
)

var pluginsCmd = &cobra.Command{
	Use:   "plugins",
	Short: "Manage, inspect, and compile plugins (requires Go build tools)",
}

var pluginsCompileCmd = &cobra.Command{
	Use: "compile",
	Example: `
  # compile plugin using Go build tools
  go build -buildmode=plugin -o lib/myplugin.so src/plugins/myplugin.go

  # try to compile all plugins in current directory
  cd src/plugins
  makeshift plugin compile

  # try to compile all plugins in specified directory
  makeshift plugin compile src/plugins
  
  # compile 'src/plugins/myplugin.go' and save to 'lib/myplugin.so'
  makeshift plugin compile src/plugins/myplugin.go -o lib/myplugin.so
`,
	Args: cobra.MaximumNArgs(1),
	Run: func(cmd *cobra.Command, args []string) {
		var (
			outputPath, _ = cmd.Flags().GetString("output")
			output        []byte
			fileInfo      os.FileInfo
			err           error
		)

		// make the directory
		err = os.MkdirAll(filepath.Dir(outputPath), 0o777)
		if err != nil {
			log.Fatal().Err(err).Msg("failed to make output directory")
		}

		// one arg passed, so determine if it is file or directory
		if len(args) > 0 {
			if fileInfo, err = os.Stat(args[0]); err == nil {
				if fileInfo.IsDir() {
					err = compilePluginsDir(args[0], outputPath)
					if err != nil {
						log.Fatal().Err(err).
							Bytes("output", output).
							Msg("failed to compile plugin")
					}
				} else {
					// not a directory so check if Go file so try and compile it
					if filepath.Ext(args[0]) == ".go" {
						output, err = compilePlugin(outputPath, args[0])
						if err != nil {
							log.Fatal().Err(err).
								Bytes("output", output).
								Msg("failed to compile plugin")
						}
					} else {
						log.Fatal().Msg("argument is not a valid plugin (must be Go file)")
					}
				}
			} else if err != nil {
				log.Fatal().Err(err).Msgf("failed to stat provided plugin path")
			}
		} else {
			// no args passed, so use current directory
			err = compilePluginsDir(".", outputPath)
			if err != nil {
				log.Fatal().Err(err).
					Bytes("output", output).
					Msg("failed to compile plugin")
			}
		}
	},
}

var pluginInspectCmd = &cobra.Command{
	Use:  "inspect",
	Args: cobra.MinimumNArgs(1),
	Example: `
  # inspect a plugin and print its information
  makeshift plugin inspect lib/jinja2.so
`,
	Run: func(cmd *cobra.Command, args []string) {
		for _, path := range args {
			var (
				plugin makeshift.Plugin
				err    error
			)
			plugin, err = service.LoadPluginFromFile(path)
			if err != nil {
				log.Error().Err(err).
					Str("path", path).
					Msg("failed to load plugin from file")
				continue
			}

			log.Info().Any("plugin", map[string]any{
				"name":        plugin.Name(),
				"version":     plugin.Version(),
				"description": plugin.Description(),
				"metadata":    plugin.Metadata(),
			}).Send()
		}
	},
}

var pluginInfoCmd = &cobra.Command{
	Use:   "info",
	Short: "Show plugin information",
	Args:  cobra.MinimumNArgs(1),
	Run: func(cmd *cobra.Command, args []string) {
		var (
			host, _       = cmd.Flags().GetString("host")
			outputPath, _ = cmd.Flags().GetString("output")

			c     = client.New(host)
			res   *http.Response
			query string
			body  []byte
			err   error
		)

		log.Debug().
			Str("host", host).
			Str("output", outputPath).
			Send()

		for _, pluginName := range args {
			query = fmt.Sprintf("/plugins/%s/info", pluginName)
			res, body, err = c.MakeRequest(client.HTTPEnvelope{
				Path:   query,
				Method: http.MethodGet,
			})
			if err != nil {
				log.Error().Err(err).
					Str("host", host).
					Str("query", query).
					Msg("failed to make request")
				os.Exit(1)
			}
			if res.StatusCode != http.StatusOK {
				log.Error().
					Any("status", map[string]any{
						"code":    res.StatusCode,
						"message": res.Status,
					}).
					Str("host", host).
					Msg("response returned bad status")
				os.Exit(1)
			}
			if outputPath != "" {
				writeFiles(outputPath, body)
			} else {
				fmt.Println(string(body))
			}
		}
	},
}

func init() {
	pluginsCompileCmd.Flags().StringP("output", "o", "", "Set the path to save compiled plugin")
	pluginsCmd.AddCommand(pluginsCompileCmd, pluginInspectCmd, pluginInfoCmd)
	rootCmd.AddCommand(pluginsCmd)
}

func compilePlugin(outputPath string, srcPath string) ([]byte, error) {
	var (
		commandArgs string
		command     *exec.Cmd
	)
	// execute command to build the plugin
	commandArgs = fmt.Sprintf("go build -buildmode=plugin -o=%s %s", outputPath, srcPath)
	command = exec.Command("bash", "-c", commandArgs)
	return command.CombinedOutput()
}

func compilePluginsDir(dirpath string, outputPath string) error {
	err := filepath.WalkDir(dirpath, func(path string, d fs.DirEntry, err error) error {
		// not a directory and is Go file, so try and compile it
		if !d.IsDir() && filepath.Ext(path) == ".go" {
			var (
				localOutputPath string = outputPath + "/" + path
			)
			output, err := compilePlugin(localOutputPath, path)
			if err != nil {
				log.Fatal().Err(err).
					Bytes("output", output).
					Str("path", localOutputPath).
					Msg("failed to compile plugin")
				return err
			}
		}
		return nil
	})
	return err
}