/*
Copyright © 2026 Craig Williams <craig@avsdev.uk>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package config

import (
	"errors"
	"fmt"
	"log/slog"
	"os"

	"git.avsdev.uk/Go/job-search/internal/config"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

func commandInit() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "init [config_path]",
		Args:  cobra.MatchAll(cobra.MinimumNArgs(0), cobra.MaximumNArgs(1)),
		Short: "Create an empty configuration file",
		PersistentPreRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("config.init.PersistentPreRun")
		},
		PersistentPostRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("config.init.PersistentPostRun")
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			slog.Debug("config.init.Run")

			if err := cobra.MinimumNArgs(0)(cmd, args); err != nil {
				return err
			}
			if err := cobra.MaximumNArgs(1)(cmd, args); err != nil {
				return err
			}

			cfgFile, _ := cmd.Flags().GetString("config")
			if cfgFile != "" {
				// Use config file from the flag.
				viper.SetConfigFile(cfgFile)
			} else {
				// Search config in /etc or local directory.
				viper.AddConfigPath(config.EtcConfigPath)
				viper.AddConfigPath(".")
				viper.SetConfigName("config")
			}

			err := viper.ReadInConfig()
			if err == nil {
				return errors.New("configuration file already exists")
			}

			_, ok := err.(viper.ConfigFileNotFoundError)
			if !errors.Is(err, os.ErrNotExist) && !ok {
				// Config file was found but another error was produced
				return err
			}

			// Load default configuration
			config.LoadDefaultConfig()

			if viper.ConfigFileUsed() == "" {
				viper.SetConfigFile(config.EtcConfigPath + "/config.yaml")
			}

			fmt.Print(
				"writing default configuration to file: " +
					viper.ConfigFileUsed() +
					"\n")

			if err := viper.WriteConfig(); err != nil {
				return err
			}
			return nil
		},
	}
	return cmd
}