package resolver

import (
	"context"
	"errors"
	"strings"

	"git.aiterp.net/rpdata/api/graphql/loader"
	"git.aiterp.net/rpdata/api/graphql/resolver/types"
	"git.aiterp.net/rpdata/api/internal/session"
	"git.aiterp.net/rpdata/api/model/change"
	"git.aiterp.net/rpdata/api/model/character"
	"git.aiterp.net/rpdata/api/model/log"
)

// CharacterArgs is an arg
type CharacterArgs struct {
	ID   *string
	Nick *string
}

// Character resolver
func (r *QueryResolver) Character(ctx context.Context, args *CharacterArgs) (*types.CharacterResolver, error) {
	var char character.Character
	var err error

	loader := loader.FromContext(ctx)
	if loader == nil {
		return nil, errors.New("no loader")
	}

	switch {
	case args.ID != nil:
		char, err = character.FindID(*args.ID)
	case args.Nick != nil:
		char, err = character.FindNick(*args.Nick)
	default:
		err = ErrCannotResolve
	}

	if err != nil {
		return nil, err
	}

	return &types.CharacterResolver{C: char}, nil
}

// CharactersArgs is an arg
type CharactersArgs struct {
	IDs    *[]string
	Nicks  *[]string
	Author *string
}

// Characters resolves the characters query
func (r *QueryResolver) Characters(ctx context.Context, args *CharactersArgs) ([]*types.CharacterResolver, error) {
	var chars []character.Character
	var err error

	loader := loader.FromContext(ctx)
	if loader == nil {
		return nil, errors.New("no loader")
	}

	switch {
	case args.IDs != nil:
		chars, err = character.ListIDs(*args.IDs...)
	case args.Nicks != nil:
		chars, err = character.ListNicks(*args.Nicks...)
	case args.Author != nil:
		chars, err = character.ListAuthor(*args.Author)
	default:
		chars, err = character.List()
	}

	if err != nil {
		return nil, err
	}

	resolvers := make([]*types.CharacterResolver, 0, len(chars))
	for i := range chars {
		if chars[i].ID == "" {
			continue
		}

		resolvers = append(resolvers, &types.CharacterResolver{C: chars[i]})
	}

	return resolvers, nil
}

// AddCharacterInput is args for the addCharacter mutation
type AddCharacterInput struct {
	Nick        string
	Name        string
	ShortName   *string
	Author      *string
	Description *string
}

// AddCharacter resolves the addCharacter mutation
func (r *MutationResolver) AddCharacter(ctx context.Context, args struct{ Input *AddCharacterInput }) (*types.CharacterResolver, error) {
	input := args.Input
	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member", "character.add") {
		return nil, ErrUnauthorized
	}

	nick := input.Nick

	name := input.Name

	shortName := ""
	if input.ShortName != nil {
		shortName = *input.ShortName
	} else {
		shortName = strings.SplitN(input.Name, " ", 2)[0]
	}

	author := user.ID
	if input.Author != nil {
		author = *input.Author

		if author != user.ID && !user.Permitted("character.add") {
			return nil, ErrPermissionDenied
		}
	}

	description := ""
	if input.Description != nil {
		description = *input.Description
	}

	character, err := character.New(nick, name, shortName, author, description)
	if err != nil {
		return nil, err
	}

	go change.Submit("Character", "add", user.ID, character.ID, map[string]interface{}{
		"name":   character.Name,
		"nick":   character.Nicks[0],
		"author": character.Author,
	})

	log.ScheduleCharacterUpdate()

	return &types.CharacterResolver{C: character}, nil
}

// CharacterNickInput is args for mutation addCharacterNick/removeCharacterNick
type CharacterNickInput struct {
	ID   string
	Nick string
}

// AddCharacterNick resolves the addCharacterNick mutation
func (r *MutationResolver) AddCharacterNick(ctx context.Context, args struct{ Input *CharacterNickInput }) (*types.CharacterResolver, error) {
	input := args.Input

	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	character, err := character.FindID(input.ID)
	if err != nil {
		return nil, err
	}
	if character.Author != user.ID && !user.Permitted("character.edit") {
		return nil, ErrPermissionDenied
	}

	err = character.AddNick(input.Nick)
	if err != nil {
		return nil, err
	}

	go change.Submit("Character", "add.nick", user.ID, character.ID, map[string]interface{}{
		"nick": input.Nick,
	})

	log.ScheduleCharacterUpdate()

	return &types.CharacterResolver{C: character}, nil
}

// RemoveCharacterNick resolves the removeCharacterNick mutation
func (r *MutationResolver) RemoveCharacterNick(ctx context.Context, args struct{ Input *CharacterNickInput }) (*types.CharacterResolver, error) {
	input := args.Input

	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	character, err := character.FindID(input.ID)
	if err != nil {
		return nil, err
	}
	if character.Author != user.ID && !user.Permitted("character.edit") {
		return nil, ErrPermissionDenied
	}

	err = character.RemoveNick(input.Nick)
	if err != nil {
		return nil, err
	}

	go change.Submit("Character", "remove.nick", user.ID, character.ID, map[string]interface{}{
		"nick": input.Nick,
	})

	log.ScheduleCharacterUpdate()

	return &types.CharacterResolver{C: character}, nil
}

// CharacterEditInput is args for mutation addCharacterNick/removeCharacterNick
type CharacterEditInput struct {
	ID          string
	Name        *string
	ShortName   *string
	Description *string
}

// EditCharacter resolves the editCharacter mutation
func (r *MutationResolver) EditCharacter(ctx context.Context, args struct{ Input *CharacterEditInput }) (*types.CharacterResolver, error) {
	input := args.Input

	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	character, err := character.FindID(input.ID)
	if err != nil {
		return nil, err
	}
	if character.Author != user.ID && !user.Permitted("character.edit") {
		return nil, ErrPermissionDenied
	}

	name := ""
	if input.Name != nil {
		name = *input.Name
	}

	shortName := ""
	if input.ShortName != nil {
		shortName = *input.ShortName
	}

	description := ""
	if input.Description != nil {
		description = *input.Description
	}

	err = character.Edit(name, shortName, description)
	if err != nil {
		return nil, err
	}

	go change.Submit("Character", "edit", user.ID, character.ID, map[string]interface{}{
		"name":        character.Name,
		"shortName":   character.ShortName,
		"description": character.Description,
	})

	return &types.CharacterResolver{C: character}, nil
}

// RemoveCharacter resolves the removeCharacter mutation
func (r *MutationResolver) RemoveCharacter(ctx context.Context, args struct{ ID string }) (*types.CharacterResolver, error) {
	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	character, err := character.FindID(args.ID)
	if err != nil {
		return nil, err
	}
	if character.Author != user.ID && !user.Permitted("character.remove") {
		return nil, ErrPermissionDenied
	}

	err = character.Remove()
	if err != nil {
		return nil, err
	}

	go change.Submit("Character", "remove", user.ID, character.ID, map[string]interface{}{
		"name":   character.Name,
		"author": character.Author,
		"nicks":  character.Nicks,
	})

	return &types.CharacterResolver{C: character}, nil
}