package core

import (
	"context"
	"database/sql"
	"fmt"
	"time"

	"github.com/google/uuid"
	"github.com/uptrace/bun"
	"github.com/uptrace/bun/dialect/pgdialect"
	"github.com/uptrace/bun/driver/pgdriver"
)

var DB *bun.DB

type DSN struct {
	Hostname string
	Port     string
	DBName   string
	User     string
	Password string
}

func (dsn *DSN) ToString() string {
	return fmt.Sprintf("postgres://%s:%s@%s:%s/%s?sslmode=disable", dsn.User, dsn.Password, dsn.Hostname, dsn.Port, dsn.DBName)
}

type Role string

const (
	AdminRole Role = "admin"
	UserRole  Role = "user"
)

type Status string

const (
	Active   Status = "Active"
	Inactive Status = "Inactive"
)

type User struct {
	bun.BaseModel `bun:"table:users"`

	UserID    uuid.UUID `bun:"type:uuid,pk,default:gen_random_uuid()" json:"userId"`
	FirstName string    `bun:"firstname,notnull" json:"firstname"`
	LastName  string    `bun:"lastname,notnull" json:"lastname"`
	Email     string    `bun:"email,unique,notnull" json:"email"`
	Password  string    `bun:"password,notnull" json:"password,omitempty"`
	Phone     string    `bun:"phone,notnull" json:"phone"`
	Role      Role      `bun:"role,notnull,default:'user'" json:"role"`
	CreatedAt time.Time `bun:"created_at,default:current_timestamp" json:"createdAt"`
	UpdatedAt time.Time `bun:"updated_at,default:current_timestamp" json:"updatedAt"`
	Events    []Event   `bun:"m2m:events_to_users,join:User=Event" json:"events,omitempty"`
	Articles  []*Blog   `bun:"rel:has-many,join:user_id=blog_id" json:"articles,omitempty"`
}

func (u *User) Insert(ctx context.Context) (sql.Result, error) {
	u.Password = fmt.Sprintf("crypt('%s', gen_salt('bf'))", u.Password)
	return DB.NewInsert().
		Model(u).
		Value("password", u.Password).
		Exec(ctx)
}

func Verify(ctx context.Context, email, password string) (*User, error) {
	// var user User
	// query := `
	// 	SELECT *
	// 	FROM users
	// 	WHERE email = ? AND password = crypt(?, password)
	// `
	//
	// err := DB.NewRaw(query, email, password).Scan(ctx, user)

	var user User
	count, err := DB.NewSelect().
		Model(&user).
		Where("email = ? AND password = crypt(?, password)", email, password).
		Limit(1).
		ScanAndCount(context.Background())
	if count == 0 {
		return nil, fmt.Errorf("invalid email or password")
	}
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, fmt.Errorf("invalid email or password")
		}
		return nil, err
	}

	return &user, nil
}

type Event struct {
	bun.BaseModel `bun:"table:events"`

	EventID       uuid.UUID `bun:"type:uuid,pk,default:gen_random_uuid()" json:"eventID"`
	CreationDate  time.Time `bun:"creation_date,notnull,default:current_timestamp" json:"creationDate"`
	ScheduleStart time.Time `bun:"schedule_start,notnull" json:"scheduleStart"`
	ScheduleEnd   time.Time `bun:"schedule_end,notnull" json:"scheduleEnd"`
	Status        Status    `bun:"status,notnull,default:Inactive" json:"status"`
}

type EventToUser struct {
	bun.BaseModel `bun:"table:events_to_users"`

	EventID uuid.UUID `bun:"type:uuid,pk"`
	UserID  uuid.UUID `bun:"type:uuid,pk"`

	Event *Event `bun:"rel:belongs-to,join:event_id=event_id"`
	User  *User  `bun:"rel:belongs-to,join:user_id=user_id"`
}

type Blog struct {
	bun.BaseModel `bun:"table:blogs"`

	BlogID    uuid.UUID `bun:"type:uuid,pk,default:gen_random_uuid()" json:"blogID"`
	Slug      string    `bun:"slug,unique,notnull" json:"slug"`
	Content   string    `bun:"content,notnull" json:"content"`
	Label     string    `bun:"label" json:"label"`
	AuthorID  uuid.UUID `bun:"author_id,type:uuid,notnull" json:"authorID"`
	Published time.Time `bun:"published,default:current_timestamp" json:"published"`
	Summary   string    `bun:"summary" json:"summary"`
	Image     string    `bun:"image" json:"image"`
	Href      string    `bun:"href" json:"href"`

	Author User `bun:"rel:belongs-to,join:author_id=user_id" json:"author"`
}

type WebsiteSettings struct {
	bun.BaseModel `bun:"table:website_settings"`

	ID               uuid.UUID `bun:"type:uuid,pk,default:gen_random_uuid()" json:"id"`
	AutoAcceptDemand bool      `bun:"auto_accept_demand,default:false" json:"autoAcceptDemand"`
}

type Media struct {
	ID       uuid.UUID `bun:"type:uuid,pk,default:gen_random_uuid()" json:"id"`
	AuthorID uuid.UUID `bun:"author_id,type:uuid,notnull" json:"authorID"`
	Author   *User     `bun:"rel:belongs-to,join:author_id=user_id" json:"author,omitempty"`
	Type     string    `bun:"media_type" json:"type"` // Image, Video, GIF etc. Add support for PDFs?
	Alt      string    `bun:"media_alt" json:"alt"`
	Path     string    `bun:"media_path" json:"path"`
	Size     int64     `bun:"media_size" json:"size"`
	URL      string    `bun:"-" json:"url"`
}

func InitDatabase(dsn DSN) (*bun.DB, error) {
	sqldb := sql.OpenDB(pgdriver.NewConnector(pgdriver.WithDSN(dsn.ToString())))
	db := bun.NewDB(sqldb, pgdialect.New())

	ctx := context.Background()

	_, err := db.ExecContext(ctx, "CREATE EXTENSION IF NOT EXISTS pgcrypto;")
	if err != nil {
		return nil, err
	}
	db.RegisterModel((*EventToUser)(nil))
	_, err = db.NewCreateTable().Model((*User)(nil)).IfNotExists().Exec(ctx)
	_, err = db.NewCreateTable().Model((*Event)(nil)).IfNotExists().Exec(ctx)
	_, err = db.NewCreateTable().Model((*EventToUser)(nil)).IfNotExists().Exec(ctx)
	_, err = db.NewCreateTable().Model((*Blog)(nil)).IfNotExists().Exec(ctx)
	_, err = db.NewCreateTable().Model((*WebsiteSettings)(nil)).IfNotExists().Exec(ctx)
	_, err = db.NewCreateTable().Model((*Media)(nil)).IfNotExists().Exec(ctx)
	if err != nil {
		return nil, err
	}

	return db, nil
}