package browsers

import (
	"database/sql"

	"github.com/mat/besticon/besticon"

	"github.com/ethereum/go-ethereum/log"
)

// Database sql wrapper for operations with browser objects.
type Database struct {
	db *sql.DB
}

// Close closes database.
func (db Database) Close() error {
	return db.db.Close()
}

func NewDB(db *sql.DB) *Database {
	return &Database{db: db}
}

type Browser struct {
	ID           string   `json:"browser-id"`
	Name         string   `json:"name"`
	Timestamp    uint64   `json:"timestamp"`
	Dapp         bool     `json:"dapp?"`
	HistoryIndex int      `json:"history-index"`
	History      []string `json:"history,omitempty"`
}

func (db *Database) InsertBrowser(browser Browser) (err error) {
	tx, err := db.db.Begin()
	if err != nil {
		return
	}
	defer func() {
		if err == nil {
			err = tx.Commit()
			return
		}
		_ = tx.Rollback()
	}()

	bInsert, err := tx.Prepare("INSERT OR REPLACE INTO browsers(id, name, timestamp, dapp, historyIndex) VALUES(?, ?, ?, ?, ?)")
	if err != nil {
		return
	}
	_, err = bInsert.Exec(browser.ID, browser.Name, browser.Timestamp, browser.Dapp, browser.HistoryIndex)
	bInsert.Close()
	if err != nil {
		return
	}

	if len(browser.History) == 0 {
		return
	}
	bhInsert, err := tx.Prepare("INSERT INTO browsers_history(browser_id, history) VALUES(?, ?)")
	if err != nil {
		return
	}
	defer bhInsert.Close()
	for _, history := range browser.History {
		_, err = bhInsert.Exec(browser.ID, history)
		if err != nil {
			return
		}
	}

	return
}

func (db *Database) GetBrowsers() (rst []*Browser, err error) {
	tx, err := db.db.Begin()
	if err != nil {
		return
	}
	defer func() {
		if err == nil {
			err = tx.Commit()
			return
		}
		_ = tx.Rollback()
	}()

	// FULL and RIGHT joins are not supported
	bRows, err := tx.Query("SELECT id, name, timestamp, dapp, historyIndex FROM browsers ORDER BY timestamp DESC")
	if err != nil {
		return
	}
	defer bRows.Close()
	browsers := map[string]*Browser{}
	for bRows.Next() {
		browser := Browser{}
		err = bRows.Scan(&browser.ID, &browser.Name, &browser.Timestamp, &browser.Dapp, &browser.HistoryIndex)
		if err != nil {
			return nil, err
		}
		browsers[browser.ID] = &browser
		rst = append(rst, &browser)
	}

	bhRows, err := tx.Query("SELECT browser_id, history from browsers_history")
	if err != nil {
		return
	}
	defer bhRows.Close()
	var (
		id      string
		history string
	)
	for bhRows.Next() {
		err = bhRows.Scan(&id, &history)
		if err != nil {
			return
		}
		browsers[id].History = append(browsers[id].History, history)
	}

	return rst, nil
}

func (db *Database) DeleteBrowser(id string) error {
	_, err := db.db.Exec("DELETE from browsers WHERE id = ?", id)
	return err
}

type BookmarksType string

type Bookmark struct {
	URL      string `json:"url"`
	Name     string `json:"name"`
	ImageURL string `json:"imageUrl"`
}

func (db *Database) GetBookmarks() ([]*Bookmark, error) {
	rows, err := db.db.Query(`SELECT url, name, image_url FROM bookmarks`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var rst []*Bookmark
	for rows.Next() {
		bookmark := &Bookmark{}
		err := rows.Scan(&bookmark.URL, &bookmark.Name, &bookmark.ImageURL)
		if err != nil {
			return nil, err
		}

		rst = append(rst, bookmark)
	}

	return rst, nil
}

func (db *Database) StoreBookmark(bookmark Bookmark) (Bookmark, error) {
	insert, err := db.db.Prepare("INSERT OR REPLACE INTO bookmarks (url, name, image_url) VALUES (?, ?, ?)")

	if err != nil {
		return bookmark, err
	}

	// Get the right icon
	finder := besticon.IconFinder{}
	icons, iconError := finder.FetchIcons(bookmark.URL)

	if iconError == nil && len(icons) > 0 {
		icon := finder.IconInSizeRange(besticon.SizeRange{48, 48, 100})
		if icon != nil {
			bookmark.ImageURL = icon.URL
		} else {
			bookmark.ImageURL = icons[0].URL
		}
	} else {
		log.Error("error getting the bookmark icon", "iconError", iconError)
	}

	_, err = insert.Exec(bookmark.URL, bookmark.Name, bookmark.ImageURL)
	return bookmark, err
}

func (db *Database) UpdateBookmark(originalURL string, bookmark Bookmark) error {
	insert, err := db.db.Prepare("UPDATE bookmarks SET url = ?, name = ?, image_url = ? WHERE url = ?")
	if err != nil {
		return err
	}
	_, err = insert.Exec(bookmark.URL, bookmark.Name, bookmark.ImageURL, originalURL)
	return err
}

func (db *Database) DeleteBookmark(url string) error {
	_, err := db.db.Exec(`DELETE FROM bookmarks WHERE url = ?`, url)
	return err
}