package orm

import (
	"fmt"
	"net/http"

	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
)

const (
	ADMINISTRATIVE_ROLE_PERSONAL = iota
	ADMINISTRATIVE_ROLE_TEACHING
	ADMINISTRATIVE_ROLE_DSGA
	ADMINISTRATIVE_ROLE_SCHOOL_CARETAKER
	ADMINISTRATIVE_ROLE_TECHNICAL_ASSISTANT
	ADMINISTRATIVE_ROLE_LIBRARIAN
	ADMINISTRATIVE_ROLE_UNDEFINED

	IssueTeacherHours = iota
)

type Timetable [][]Activity

type Person interface {
	GetCredential() *Credential
}

type TheBoss struct {
	gorm.Model
	Credential
	Teachers []Teacher
}

type Address struct {
	City    string
	Street  string
	ZipCode string
	Country string
}

type Location struct {
	Id      string
	Name    string
	Address *Address
}

type Room struct {
	Id       string
	Name     string
	Capacity int
	Location *Location
}

type Desk struct {
	Id       string
	Name     string
	Students []*Student
	Teacher  *Teacher
}

type Student struct {
	gorm.Model
	Credential
	Class *Class
}

type Director struct {
	gorm.Model
	Credential
}

type Administrative struct {
	gorm.Model
	Credential
	Role int
}

type Office struct {
	gorm.Model
	Credential
	Persons []Person
}

type Department struct {
	gorm.Model
	Name     string
	Subjects []Subject
	Teachers []Teacher
}

type GetFn func(map[string]string) (interface{}, error)
type PostFn func(map[string]string, *http.Request) (IDer, error)

var (
	currDB *gorm.DB

	Get map[string]GetFn = map[string]GetFn{
		// Teacher
		"/teachers":             GetTeachersAll,
		"/teachers/{id}":        GetTeacherAll,
		"/teachers/{id}/update": GetTeacher,
		"/teachers/add/":        GetNothing,

		"/api/teachers":             GetTeachersAll,
		"/api/teachers/{id}":        GetTeacherAll,
		"/api/teachers/{id}/update": GetTeacher,
		"/api/teachers/add/":        GetNothing,

		// Classes
		"/classes":             GetClassesAll,
		"/classes/{id}":        GetClassAll,
		"/classes/{id}/update": GetClassForUpdate,
		"/classes/add/":        GetClassForAdd,

		"/api/classes":             GetClassesAll,
		"/api/classes/{id}":        GetClassAll,
		"/api/classes/{id}/update": GetClassForUpdate,
		"/api/classes/add/":        GetClassForAdd,

		// Subjects
		"/subjects":             GetSubjectsAll,
		"/subjects/{id}":        GetSubjectAll,
		"/subjects/{id}/update": GetSubjectForUpdate,
		"/subjects/add/":        GetSubjectForAdd,

		"/api/subjects":             GetSubjectsAll,
		"/api/subjects/{id}":        GetSubjectAll,
		"/api/subjects/{id}/update": GetSubjectForUpdate,
		"/api/subjects/add/":        GetSubjectForAdd,

		// Activity
		"/activities":             GetActivitiesAll,
		"/activities/{id}":        GetActivityAll,
		"/activities/{id}/update": GetActivityForUpdate,
		"/activities/add/":        GetActivityForAdd,

		"/api/activities":             GetActivitiesAll,
		"/api/activities/{id}":        GetActivityAll,
		"/api/activities/{id}/update": GetActivityForUpdate,
		"/api/activities/add/":        GetActivityForAdd,
	}

	Post map[string]PostFn = map[string]PostFn{
		// Teacher
		"/teachers/{id}/update": UpdateTeacher,
		"/teachers/{id}/delete": DeleteTeacher,
		"/teachers/add/":        AddTeacher,

		"/api/teachers/add":          AddTeacher,
		"/api//teachers/{id}/delete": DeleteTeacher,
		"/api//teachers/add/":        AddTeacher,

		// Classes
		"/classes/{id}/update": UpdateClass,
		"/classes/{id}/delete": DeleteClass,
		"/classes/add/":        AddClass,

		"/api//classes/{id}/update": UpdateClass,
		"/api//classes/{id}/delete": DeleteClass,
		"/api//classes/add/":        AddClass,

		// Subjects
		"/subjects/{id}/update": UpdateSubject,
		"/subjects/{id}/delete": DeleteSubject,
		"/subjects/add/":        AddSubject,

		"/api//subjects/{id}/update": UpdateSubject,
		"/api//subjects/{id}/delete": DeleteSubject,
		"/api//subjects/add/":        AddSubject,

		// Activity
		"/activities/{id}/update": UpdateActivity,
		"/activities/{id}/delete": DeleteActivity,
		"/activities/add/":        AddActivity,

		"/api//activities/{id}/update": UpdateActivity,
		"/api//activities/{id}/delete": DeleteActivity,
		"/api//activities/add/":        AddActivity,
	}
)

func New(connection string) (*gorm.DB, error) {
	db, err := gorm.Open("mysql", connection)
	if err != nil {
		return nil, err
	}
	return db, nil
}

func Use(db *gorm.DB) {
	currDB = db
}

func DB() *gorm.DB {
	return currDB
}

func AutoMigrate() {
	if err := currDB.AutoMigrate(
		&School{},
		&Subject{},
		&Teacher{},
		&Class{},
		&Activity{},
		&Department{},
		&TheBoss{},
		&Administrative{},
		&Student{},
		&Director{},
		&Issue{},
	).Error; err != nil {
		panic(err)
	}

}

func GetResultFunc(path string) (GetFn, error) {
	fn, ok := Get[path]
	if !ok {
		return nil, fmt.Errorf("Can't map %s!", path)
	}

	return fn, nil
}

func PostFunc(path string) (PostFn, error) {
	fn, ok := Post[path]
	if !ok {
		return nil, fmt.Errorf("Can't map %s!", path)
	}

	return fn, nil
}