package config

import (
	"reflect"
	"strings"

	"github.com/urfave/cli/v2"

	"github.com/photoprism/photoprism/pkg/clean"
	"github.com/photoprism/photoprism/pkg/list"
)

func firstName(names string) string {
	if n := strings.Split(names, ","); len(n) > 0 {
		return strings.TrimSpace(n[0])
	}

	return ""
}

// CliFlags represents a list of command-line parameters.
type CliFlags []CliFlag

// Cli returns the currently active command-line parameters.
func (f CliFlags) Cli() (result []cli.Flag) {
	result = make([]cli.Flag, 0, len(f))

	for _, flag := range f {
		result = append(result, flag.Flag)
	}

	return result
}

// Find finds command-line parameters based on a list of tags.
func (f CliFlags) Find(tags []string) (result []cli.Flag) {
	result = make([]cli.Flag, 0, len(f))

	for _, flag := range f {
		if len(flag.Tags) > 0 && !list.ContainsAny(flag.Tags, tags) {
			continue
		}

		result = append(result, flag.Flag)
	}

	return result
}

// Remove removes command flags by name.
func (f CliFlags) Remove(names []string) (result CliFlags) {
	result = make(CliFlags, 0, len(f))

	for _, flag := range f {
		if list.ContainsAny(names, []string{flag.Name(), flag.String()}) {
			continue
		}

		result = append(result, flag)
	}

	return result
}

// Replace replaces an existing command flag by name and returns true if successful.
func (f CliFlags) Replace(name string, replacement CliFlag) CliFlags {
	if name = firstName(name); name == "" {
		log.Warnf("config: invalid name provided to replace cli flag %s", clean.Log(name))
		return f
	}

	done := false

	if name = firstName(name); name != "" {
		for i, flag := range f {
			if !done && flag.Name() == name {
				f[i] = replacement
				done = true
			}
		}
	}

	if !done {
		log.Warnf("config: failed to replace cli flag %s", clean.Log(name))
	}

	return f
}

// Insert inserts command flags, if possible after the flag specified by name.
func (f CliFlags) Insert(name string, insert []CliFlag) (result CliFlags) {
	if name = firstName(name); name == "" {
		log.Warnf("config: invalid name provided to insert cli flag after %s", clean.Log(name))
		return f
	}

	result = make(CliFlags, 0, len(f)+len(insert))
	done := false

	for _, flag := range f {
		result = append(result, flag)

		if !done && flag.Name() == name {
			result = append(result, insert...)
			done = true
		}
	}

	if !done {
		log.Warnf("config: failed to insert cli flags after %s", clean.Log(name))
		result = append(result, insert...)
	}

	return result
}

// InsertBefore inserts command flags, if possible before the flag specified by name.
func (f CliFlags) InsertBefore(name string, insert []CliFlag) (result CliFlags) {
	if name = firstName(name); name == "" {
		log.Warnf("config: invalid name provided to insert cli flag before %s", clean.Log(name))
		return f
	}

	result = make(CliFlags, 0, len(f)+len(insert))
	done := false

	for _, flag := range f {
		if !done && flag.Name() == name {
			result = append(result, insert...)
			done = true
		}

		result = append(result, flag)
	}

	if !done {
		log.Warnf("config: failed to insert cli flags before %s", clean.Log(name))
		result = append(result, insert...)
	}

	return result
}

// Prepend adds command flags at the beginning.
func (f CliFlags) Prepend(el []CliFlag) (result CliFlags) {
	result = make(CliFlags, 0, len(f)+len(el))

	result = append(result, el...)
	return append(result, f...)
}

// SetHidden updates the hidden property of the config flags to the specified value.
func (f CliFlags) SetHidden(hidden bool, names ...string) (result CliFlags) {
	result = make(CliFlags, 0, len(f))

	for _, flag := range f {
		if list.Contains(names, flag.Name()) {
			rv := reflect.ValueOf(flag.Flag)

			if rv.Kind() == reflect.Ptr {
				rv = rv.Elem()
			}

			if rv.Kind() == reflect.Struct {
				field := rv.FieldByName("Hidden")

				if field.IsValid() && field.CanSet() && field.Kind() == reflect.Bool {
					field.SetBool(hidden)
				}
			}
		}

		result = append(result, flag)
	}

	return result
}