/*
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"
	"reflect"
	"strconv"

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

func setConfig(conf *config.JobSearchConfig, key string, value string) error {
	var confValue any = nil
	var confType reflect.Kind
	var err error

	confType, err = conf.TypeOf(key)
	if err != nil {
		return err
	}

	switch confType {
	case reflect.Bool:
		confValue, err = strconv.ParseBool(value)
	case reflect.String:
		confValue = value
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		confValue, err = strconv.ParseInt(value, 10, 64)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		confValue, err = strconv.ParseUint(value, 10, 64)
	case reflect.Float32, reflect.Float64:
		confValue, err = strconv.ParseFloat(value, 64)
	default:
		err = errors.ErrUnsupported
	}
	if err != nil {
		return fmt.Errorf("config value type not accepted, expected <%s>", confType)
	}

	viper.Set(key, confValue)
	if err := viper.WriteConfig(); err != nil {
		return err
	}
	fmt.Print(key, " = ", confValue, " <", confType, ">\n")

	return nil
}
func unsetConfig(conf *config.JobSearchConfig, key string) error {
	if _, err := conf.TypeOf(key); err != nil {
		return err
	}

	v := viper.New()
	v.SetConfigFile(viper.ConfigFileUsed())

	keys := viper.AllKeys()
	for i := range keys {
		k := keys[i]
		if k != key {
			v.Set(k, viper.Get(k))
		}
	}

	if err := v.WriteConfig(); err != nil {
		return err
	}

	return nil
}

func commandSet(opts *cli.Options) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "set [config_key] [config_value]",
		Args:  cobra.MatchAll(cobra.MinimumNArgs(1), cobra.MaximumNArgs(2)),
		Short: "Set a value to configuration",
		PersistentPreRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("config.set.PersistentPreRun")
		},
		PersistentPostRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("config.set.PersistentPostRun")
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			slog.Debug("config.set.Run")

			if err := cobra.MinimumNArgs(1)(cmd, args); err != nil {
				return err
			}
			if err := cobra.MaximumNArgs(2)(cmd, args); err != nil {
				return err
			}

			unset, unsetFlagErr := cmd.Flags().GetBool("unset")
			if unsetFlagErr != nil {
				return unsetFlagErr
			}
			if err := cobra.ExactArgs(2)(cmd, args); err != nil && !unset {
				return err
			}

			conf, err := opts.RunSetup(cmd, true, true)
			if err != nil {
				return fmt.Errorf("no configuration loaded (%w)", err)
			}

			if viper.ConfigFileUsed() == "" {
				return errors.New("no configuration file exists")
			}

			if unset {
				return unsetConfig(conf, args[0])
			} else {
				return setConfig(conf, args[0], args[1])
			}
		},
	}
	cmd.Flags().BoolP("unset", "x", false, "clear configuration setting")
	return cmd
}