package orm

import (
	"fmt"
	"net/http"
	"os"
	"strings"
	"time"

	"git.andreafazzi.eu/andrea/oef/errors"
	"git.andreafazzi.eu/andrea/oef/mail"
	"git.andreafazzi.eu/andrea/oef/renderer"
	"github.com/dchest/captcha"
	"github.com/jinzhu/gorm"
)

type RegionID uint

var mailBody = `
Spettabile {{.NameForMail}},

grazie per l'interesse manifestato per le Olimpiadi di Economia e Finanza.

Di seguito riportiamo le credenziali di accesso tramite le quali potrà gestire le iscrizioni dei suoi studenti alla competizione (Fase Regionale).

username: {{.Username}}
password: {{.Password}}

Per accedere alla pagina di login occorrerà seguire questo link

https://iscrizioni.olimpiadi-economiaefinanza.it/

ed inserire le credenziali riportate sopra (si consiglia di effettuare un copia/incolla).

Questa mail è stata generata da un sistema automatico, si prega di non rispondere.

Cordialmente,
Lo Staff delle OEF 2020.
`

type School struct {
	gorm.Model

	UserModifier

	Name          string
	Address       string
	Email         string
	Code          string
	EmailSentDate time.Time

	SchoolContactPersonLastname  string
	SchoolContactPersonFirstname string

	ContestDirectorLastname  string
	ContestDirectorFirstname string

	UserID   uint
	RegionID RegionID `schema:"region_id"`

	Region       *Region
	User         *User
	Participants []*Participant

	SelectedRegion map[uint]string `gorm:"-"`
	AllRegions     []*Region       `gorm:"-"`

	CaptchaID       string `gorm:"-",schema:"-"`
	CaptchaSolution string `gorm:"-",schema:"-"`

	mailSender *mail.MailSender
}

func (id *RegionID) UnmarshalCSV(csv string) error {
	*id = RegionID(regionsMap[strings.Title(strings.ToLower(csv))])
	return nil
}

func (model *School) GetID() uint { return model.ID }

func (model *School) String() string {
	return fmt.Sprintf("%s (%s)", model.Code, model.Name)
}

func (model *School) NameForMail() string {
	return fmt.Sprintf("%s (%s)", model.Name, model.Code)
}

func (model *School) Username() string {
	return strings.ToUpper(model.Code)
}

func (model *School) Password() string {
	return model.User.Password
}

func (model *School) To() string {
	return model.Email
}

func (model *School) SetCreatorID(id uint) {
	model.CreatorID = id
}

func (model *School) SetCreatorRole(role string) {
	model.CreatorRole = role
}

func (model *School) SetCreatorIP(addr string) {
	model.CreatorIP = addr
}

func (model *School) SetUpdaterID(id uint) {
	model.UpdaterID = id
}

func (model *School) SetUpdaterRole(role string) {
	model.UpdaterRole = role
}

func (model *School) SetUpdaterIP(addr string) {
	model.UpdaterIP = addr
}

func (model *School) exists(db *Database) (*User, error) {
	var user User
	if err := db._db.First(&user, &User{Username: model.Username()}).Error; err != nil && err != gorm.ErrRecordNotFound {
		return nil, err
	} else if err == gorm.ErrRecordNotFound {
		return nil, nil
	}
	return &user, nil
}

func (model *School) BeforeSave(tx *gorm.DB) error {
	var user User
	if err := tx.FirstOrCreate(&user, &User{
		Username: model.Username(),
		Role:     "school",
	}).Error; err != nil {
		return err
	}
	model.UserID = user.ID

	// School code is always uppercase
	model.Code = strings.ToUpper(model.Code)

	return nil
}

func (model *School) AfterDelete(tx *gorm.DB) error {
	if err := tx.Unscoped().Delete(model.User).Error; err != nil {
		return err
	}
	return nil
}

func (model *School) AfterCreate(tx *gorm.DB) error {
	if err := tx.Preload("User").First(model).Error; err != nil {
		return err
	}
	if err := model.mailSender.SendSubscriptionMail(model); err != nil {
		return err
	}

	if err := tx.Model(model).Update("email_sent_date", time.Now()).Error; err != nil {
		return err
	}

	return nil
}

func (model *School) Create(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	if r.Method == "GET" {
		school := new(School)

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

		return school, nil
	} else {
		if isSubscriber(r) && os.Getenv("OEF_REGRESSION_TEST") != "1" {
			if !captcha.VerifyString(r.FormValue("CaptchaID"), r.FormValue("CaptchaSolution")) {
				return nil, errors.WrongCaptcha
			}
		}
		school := new(School)
		err := renderer.Decode(school, r)
		if err != nil {
			return nil, err
		}

		// Check if this user already exists in the users table.
		if user, err := school.exists(db); err == nil && user != nil {
			if err := db._db.Where("user_id = ?", user.ID).Find(&school).Error; err != nil {
				return nil, err
			}
			return nil, errors.SchoolExists
		} else if err != nil {
			return nil, err
		}

		WriteCreator(r, school)

		school.mailSender = mail.NewMailSender(db.Config, mailBody)
		school, err = CreateSchool(db, school)
		if err != nil {
			return nil, err
		}
		return school, nil
	}
}

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

	id := args["id"]

	if isSchool(r) && id != getModelIDFromToken(r) {
		return nil, errors.NotAuthorized
	}

	if err := db._db.
		Preload("Participants").
		Preload("Participants.Category").
		Preload("Region").
		Preload("User").
		Preload("Creator").
		Preload("Updater").
		First(&school, id).Error; err != nil {
		return nil, err
	}

	return &school, nil
}

func (model *School) ReadAll(db *Database, args map[string]string, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	var schools []*School
	if err := db._db.
		Preload("Participants").
		Preload("Participants.Category").
		Preload("Region").
		Order("code").
		Find(&schools).Error; err != nil {
		return nil, err
	}
	return schools, nil
}

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

		school := result.(*School)

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

		school.SelectedRegion = make(map[uint]string)
		school.SelectedRegion[uint(school.RegionID)] = "selected"

		return school, nil
	} else {
		school, err := model.Read(db, args, w, r)
		if err != nil {
			return nil, err
		}
		err = renderer.Decode(school, r)
		if err != nil {
			return nil, err
		}

		// Check if the modified school code belong to an existing school.
		if user, err := school.(*School).exists(db); err == nil && user != nil {
			if user.ID != school.(*School).UserID {
				return nil, errors.SchoolExists
			}
		} else if err != nil {
			return nil, err
		}

		WriteUpdater(r, school.(*School))

		_, err = SaveSchool(db, school)
		if err != nil {
			return nil, err
		}
		school, err = model.Read(db, args, w, r)
		if err != nil {
			return nil, err
		}
		return school.(*School), nil
	}
}

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

func CreateSchool(db *Database, school *School) (*School, error) {
	if err := db._db.Create(school).Error; err != nil {
		return nil, err
	}
	return school, nil
}

func SaveSchool(db *Database, school interface{}) (interface{}, error) {
	if err := db._db.Omit("Region", "Creator", "Updater").Save(school).Error; err != nil {
		return nil, err
	}
	return school, nil
}

func (model *School) HasCategory(db *Database, participant *Participant) (bool, error) {
	var participants []*Participant

	if err := db._db.
		Where("category_id = ? AND school_id = ? AND id <> ?", participant.CategoryID, model.ID, participant.ID).
		Find(&participants).Error; err != nil {
		return false, err
	}
	return len(participants) > 0, nil
}