package models

import (
	"database/sql"
	"time"
    "errors"

	"github.com/google/uuid"
)

type SiteId string

type SiteEntry struct {
    Id SiteId
    Name string
    Webmaster WebmasterId
    Url string
    DateAdded time.Time
    Next SiteId
    Prev SiteId
}

type SiteEntryModel struct {
    DB *sql.DB
}

// Commit a SiteEntry to the database
func (m *SiteEntryModel) Insert(name string, url string, webmaster *Webmaster) (SiteId, error) {
    stmt := `INSERT INTO siteentries (id, name, url, webmaster, dateAdded)
    VALUES(?,?,?,?,datetime("now"))`

    id := uuid.NewString()
    _, err := m.DB.Exec(stmt, id, name, url, webmaster.Id)
    if err != nil {
        return "", nil
    }

    return SiteId(id), nil
}

// Retrieve a SiteEntry from the database by id
func (m *SiteEntryModel) Get(id SiteId) (*SiteEntry, error) {
    stmt := `SELECT id, name, url, webmaster, dateAdded, next, prev FROM siteentries
    WHERE id = ?`

    row := m.DB.QueryRow(stmt, id)
    s := &SiteEntry{}

    
    err := row.Scan(&s.Id, &s.Name, &s.Url, &s.Webmaster, &s.DateAdded, &s.Next, &s.Prev)
    if err != nil {
        if errors.Is(err, sql.ErrNoRows) {
            return nil, ErrNoRecord
        } else {
            return nil, err
        }
    }

    return s, nil
}

// Retrieve a SiteEntry from the database by url
func (m *SiteEntryModel) GetByUrl(url string) (*SiteEntry, error) {
    stmt := `SELECT id, name, url, webmaster, dateAdded, next, prev FROM siteentries
    WHERE url = ?`

    row := m.DB.QueryRow(stmt, url)
    s := &SiteEntry{}

    
    err := row.Scan(&s.Id, &s.Name, &s.Url, &s.Webmaster, &s.DateAdded, &s.Next, &s.Prev)
    if err != nil {
        if errors.Is(err, sql.ErrNoRows) {
            return nil, ErrNoRecord
        } else {
            return nil, err
        }
    }

    return s, nil
}

// Update existing SiteEntry with the values of passed entry
func (m *SiteEntryModel) Update(entry *SiteEntry) error {
    return nil
}

// Delete SiteEntry from database
func (m *SiteEntryModel) Delete(entry *SiteEntry) error {
    return nil
}

// Get latest 
func (m *SiteEntryModel) Latest() ([]*SiteEntry, error) {
    stmt := `SELECT id, name, url, webmaster, dateAdded FROM siteentries
    ORDER BY dateAdded DESC LIMIT 10`

    rows, err := m.DB.Query(stmt)
    if err != nil {
        return nil, err
    }

    defer rows.Close()

    entries := []*SiteEntry{}
    // var timeStr string

    for rows.Next() {
        s := &SiteEntry{}
        err = rows.Scan(&s.Id, &s.Name, &s.Url, &s.Webmaster, &s.DateAdded)
        if err != nil {
            return nil, err
        }
        if err != nil {
            return nil, err
        }

        entries = append(entries, s)
    }

    if err = rows.Err(); err != nil {
        return nil, err
    }

    return entries, nil
}