package orm

import (
	"net/http"

	"git.andreafazzi.eu/andrea/oef/renderer"
	"github.com/jinzhu/gorm"
)

type Answer struct {
	gorm.Model

	Text    string
	Correct bool

	Question   *Question
	QuestionID uint `schema:"question_id"`

	AllQuestions []*Question     `gorm:"-"`
	Selected     map[uint]string `gorm:"-"`
}

func (a *Answer) GetID() uint { return a.ID }

func (a *Answer) String() string {
	return a.Text
}

func (a *Answer) Create(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	if r.Method == "GET" {
		answer := new(Answer)
		if err := db._db.Find(&answer.AllQuestions).Error; err != nil {
			return nil, err
		}

		return answer, nil
	} else {
		answer := new(Answer)
		err := renderer.Decode(answer, r)
		if err != nil {
			return nil, err
		}
		answer, err = CreateAnswer(db, answer)
		if err != nil {
			return nil, err
		}
		return answer, nil
	}
}

func (a *Answer) Read(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	var answer Answer

	id := args["id"]

	if err := db._db.Preload("Question").First(&answer, id).Error; err != nil {
		return nil, err
	}

	return &answer, nil
}

func (a *Answer) ReadAll(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	var answers []*Answer
	if err := db._db.Preload("Question").Order("created_at").Find(&answers).Error; err != nil {
		return nil, err
	}
	return answers, nil
}

func (a *Answer) Update(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	if r.Method == "GET" {
		result, err := a.Read(db, args, w, r)
		if err != nil {
			return nil, err
		}

		answer := result.(*Answer)

		if err := db._db.Find(&answer.AllQuestions).Error; err != nil {
			return nil, err
		}

		answer.Selected = make(map[uint]string)
		answer.Selected[answer.QuestionID] = "selected"

		return answer, nil
	} else {
		answer, err := a.Read(db, args, w, r)
		if err != nil {
			return nil, err
		}

		// FIXME: Should not be hard set.
		answer.(*Answer).Correct = false

		err = renderer.Decode(answer, r)
		if err != nil {
			return nil, err
		}
		_, err = SaveAnswer(db, answer)
		if err != nil {
			return nil, err
		}
		answer, err = a.Read(db, args, w, r)
		if err != nil {
			return nil, err
		}
		return answer.(*Answer), nil
	}
}

func (model *Answer) Delete(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	answer, err := model.Read(db, args, w, r)
	if err != nil {
		return nil, err
	}
	if err := db._db.Unscoped().Delete(answer.(*Answer)).Error; err != nil {
		return nil, err
	}
	return answer.(*Answer), nil
}

func CreateAnswer(db *Database, answer *Answer) (*Answer, error) {
	if err := db._db.Create(answer).Error; err != nil {
		return nil, err
	}
	return answer, nil
}

func SaveAnswer(db *Database, answer interface{}) (interface{}, error) {
	if err := db._db.Omit("Answers").Save(answer).Error; err != nil {
		return nil, err
	}
	return answer, nil
}