package web

import (
	"log"

	"git.kapelle.org/niklas/beerpong-elo/internal/model"
	"git.kapelle.org/niklas/beerpong-elo/internal/repo"
	"github.com/graphql-go/graphql"
)

func createShema(repo repo.Repo) graphql.Schema {

	player := graphql.NewObject(graphql.ObjectConfig{
		Name:        "Player",
		Description: "A player. Can also be authors of games",
		Fields: graphql.Fields{
			"ID": &graphql.Field{
				Type: graphql.NewNonNull(graphql.ID),
			},
			"name": &graphql.Field{
				Type: graphql.NewNonNull(graphql.String),
			},
			"elo": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Int),
			},

			// Field "games" added below
			// Field "history" added below
		},
	})

	game := graphql.NewObject(graphql.ObjectConfig{
		Name:        "Game",
		Description: "A game played",
		Fields: graphql.Fields{
			"id": &graphql.Field{
				Type: graphql.NewNonNull(graphql.ID),
			},
			"added": &graphql.Field{
				Type: graphql.NewNonNull(graphql.DateTime),
			},
			"overtime": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Boolean),
			},
			"score": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Int),
			},
			"author": &graphql.Field{
				Type: graphql.NewNonNull(player),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					game, ok := p.Source.(*model.Game)
					if !ok {
						log.Printf("Can't get source for field 'author' on 'Game' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(game.Author)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
			"team0player0": &graphql.Field{
				Type: graphql.NewNonNull(player),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					game, ok := p.Source.(*model.Game)
					if !ok {
						log.Printf("Can't get source for field 'team0player0' on 'Game' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(game.Team0Player0)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
			"team0player1": &graphql.Field{
				Type: graphql.NewNonNull(player),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					game, ok := p.Source.(*model.Game)
					if !ok {
						log.Printf("Can't get source for field 'team0player1' on 'Game' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(game.Team0Player1)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
			"team1player0": &graphql.Field{
				Type: graphql.NewNonNull(player),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					game, ok := p.Source.(*model.Game)
					if !ok {
						log.Printf("Can't get source for field 'team1player0' on 'Game' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(game.Team1Player0)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
			"team1player1": &graphql.Field{
				Type: graphql.NewNonNull(player),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					game, ok := p.Source.(*model.Game)
					if !ok {
						log.Printf("Can't get source for field 'team1player1' on 'Game' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(game.Team1Player1)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
		},
	})

	player.AddFieldConfig("games", &graphql.Field{
		Type: graphql.NewNonNull(graphql.NewList(game)),
		Resolve: func(p graphql.ResolveParams) (interface{}, error) {
			player, ok := p.Source.(*model.Player)

			if !ok {
				log.Printf("Can't get source for field 'games' on 'Player' is %v", p.Source)
				return nil, nil
			}

			games, err := repo.GetGamesForPlayer(player.ID)

			if err != nil {
				return nil, err
			}

			return games, nil
		},
	})

	gameResult := graphql.NewObject(graphql.ObjectConfig{
		Name:        "GameResult",
		Description: "The ELO change for a player in a game",
		Fields: graphql.Fields{
			"id": &graphql.Field{
				Type: graphql.NewNonNull(graphql.ID),
			},
			"player": &graphql.Field{
				Type: player,
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					gameResult, ok := p.Source.(*model.GameResult)
					if !ok {
						log.Printf("Can't get source for field 'player' on 'GameResult' is %v", p.Source)
						return nil, nil
					}

					player, err := repo.GetPlayer(gameResult.Player)
					if err != nil {
						return nil, err
					}

					return player, nil
				},
			},
			"game": &graphql.Field{
				Type: graphql.NewNonNull(game),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					gameResult, ok := p.Source.(*model.GameResult)
					if !ok {
						log.Printf("Can't get source for field 'game' on 'GameResult' is %v", p.Source)
						return nil, nil
					}

					game, err := repo.GetGame(gameResult.Game)
					if err != nil {
						return nil, err
					}

					return game, nil
				},
			},
			"startElo": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Int),
			},
			"endElo": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Int),
			},
			"delta": &graphql.Field{
				Type: graphql.NewNonNull(graphql.Int),
				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
					gameResult, ok := p.Source.(*model.GameResult)
					if !ok {
						log.Printf("Can't get source for field 'delta' on 'GameResult' is %v", p.Source)
						return nil, nil
					}

					delta := gameResult.EndElo - gameResult.StartElo
					return delta, nil
				},
			},
		},
	})

	player.AddFieldConfig("history", &graphql.Field{
		Type: graphql.NewNonNull(graphql.NewList(gameResult)),
		Args: graphql.FieldConfigArgument{
			"game": &graphql.ArgumentConfig{
				Type:        graphql.ID,
				Description: "Filter by Game ID",
			},
		},
		Resolve: func(p graphql.ResolveParams) (interface{}, error) {
			player, ok := p.Source.(*model.Player)
			if !ok {
				log.Printf("Can't get source from field 'history' on 'player' is %v", p.Source)
				return nil, nil
			}

			if p.Args["game"] != nil {
				// Find result for single game
				gameID, ok := p.Args["game"].(string)
				if !ok {
					log.Printf("Failed to parse 'game' at field 'history' on 'player' is %v", p.Args["game"])
					return nil, nil
				}

				gameResult, err := repo.GetGameResultForPlayerAndGame(model.GameID(gameID), player.ID)
				if err != nil {
					return nil, err
				}

				return []*model.GameResult{gameResult}, nil
			}

			// Find all gameResults for a player

			gameResults, err := repo.GetGameResultsForPlayer(player.ID)
			if err != nil {
				return nil, err
			}

			return gameResults, nil
		},
	})

	queryFields := graphql.Fields{
		"player": &graphql.Field{
			Type:        player,
			Description: "Get player by ID",
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				id, ok := p.Args["id"].(string)
				if !ok {
					log.Printf("Failed to parse ID at player: %v", p.Args["id"])
					return nil, nil
				}

				player, err := repo.GetPlayer(model.PlayerID(id))
				if err != nil {
					return nil, err
				}

				return player, nil
			},
		},
		"game": &graphql.Field{
			Type:        game,
			Description: "Get game by ID",
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				id, ok := p.Args["id"].(string)
				if !ok {
					log.Printf("Failed to parse ID at game: %v", p.Args["id"])
					return nil, nil
				}

				game, err := repo.GetGame(model.GameID(id))
				if err != nil {
					return nil, err
				}

				return game, nil
			},
		},
		"gameResult": &graphql.Field{
			Type:        gameResult,
			Description: "Result of a game on a players ELO",
			Args: graphql.FieldConfigArgument{
				"id": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.ID),
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				id, ok := p.Args["id"].(string)
				if !ok {
					log.Printf("Failed to parse ID at gameResult: %v", p.Args["id"])
					return nil, nil
				}

				gameResult, err := repo.GetGameResult(model.GameResultID(id))
				if err != nil {
					return nil, err
				}

				return gameResult, nil
			},
		},
		"players": &graphql.Field{
			Type:        graphql.NewNonNull(graphql.NewList(player)),
			Description: "Get all players",
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				players, err := repo.GetPlayers()
				if err != nil {
					return nil, err
				}

				return players, nil
			},
		},
		"games": &graphql.Field{
			Type:        graphql.NewNonNull(graphql.NewList(game)),
			Description: "Get all games",
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				games, err := repo.GetGames()
				if err != nil {
					return nil, err
				}

				return games, nil
			},
		},
	}

	querySchema := graphql.ObjectConfig{
		Name:   "Query",
		Fields: queryFields,
	}

	schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(querySchema)}
	schema, err := graphql.NewSchema(schemaConfig)
	if err != nil {
		log.Fatalf("failed to create new schema, error: %v", err)
	}

	return schema
}