package main

import (
	"crypto/rand"
	"database/sql"
	"io"
	"io/ioutil"
	"log"
	"os"
	"path"
	"path/filepath"
	"sort"
	"time"
)

var DB *sql.DB

func initializeDB() {
	var err error
	DB, err = sql.Open("sqlite3", c.DBFile)
	if err != nil {
		log.Fatal(err)
	}
	createTablesIfDNE()
}

func getAnalyticsDB() *sql.DB {
	db, err := sql.Open("sqlite3", c.AnalyticsDBFile)
	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS log (
  id INTEGER PRIMARY KEY NOT NULL,
  timestamp TEXT NOT NULL,
  protocol TEXT NOT NULL,
  request_ip TEXT,
  request_user TEXT,
  status INTEGER,
  destination_host TEXT,
  path TEXT,
  method TEXT,
  referer TEXT
);`)
	if err != nil {
		log.Fatal(err)
	}
	return db
}

type File struct { // also folders
	Creator     string
	Name        string // includes folder
	UpdatedTime time.Time
	TimeAgo     string
	IsText      bool
	Children    []File
	Host        string
}

func fileFromPath(fullPath string) File {
	info, _ := os.Stat(fullPath)
	creatorFolder := getCreator(fullPath)
	isText := isTextFile(fullPath)
	updatedTime := info.ModTime()
	return File{
		Name:        getLocalPath(fullPath),
		Creator:     path.Base(creatorFolder),
		UpdatedTime: updatedTime,
		IsText:      isText,
		TimeAgo:     timeago(&updatedTime),
		Host:        c.Host,
	}

}

type User struct {
	Username  string
	Email     string
	Active    bool
	Admin     bool
	CreatedAt int // timestamp
	Reference string
}

func getActiveUserNames() ([]string, error) {
	rows, err := DB.Query(`SELECT username from user WHERE active is true order by username`)
	if err != nil {
		return nil, err
	}
	var users []string
	for rows.Next() {
		var user string
		err = rows.Scan(&user)
		if err != nil {
			return nil, err
		}
		users = append(users, user)
	}

	return users, nil
}

func getUserByName(username string) (*User, error) {
	var user User
	row := DB.QueryRow(`SELECT username, email, active, admin, created_at, reference from user WHERE username = ?`, username)
	err := row.Scan(&user.Username, &user.Email, &user.Active, &user.Admin, &user.CreatedAt, &user.Reference)
	if err != nil {
		return nil, err
	}
	return &user, nil
}

func getUsers() ([]User, error) {
	rows, err := DB.Query(`SELECT username, email, active, admin, created_at, reference from user ORDER BY created_at DESC`)
	if err != nil {
		return nil, err
	}
	var users []User
	for rows.Next() {
		var user User
		err = rows.Scan(&user.Username, &user.Email, &user.Active, &user.Admin, &user.CreatedAt, &user.Reference)
		if err != nil {
			return nil, err
		}
		users = append(users, user)
	}
	return users, nil
}

func getIndexFiles(admin bool) ([]*File, error) { // cache this function
	result := []*File{}
	err := filepath.Walk(c.FilesDirectory, func(thepath string, info os.FileInfo, err error) error {
		if err != nil {
			log.Printf("Failure accessing a path %q: %v\n", thepath, err)
			return err // think about
		}
		if !admin && info.IsDir() && info.Name() == HiddenFolder {
			return filepath.SkipDir
		}
		// make this do what it should
		if !info.IsDir() {
			res := fileFromPath(thepath)
			result = append(result, &res)
		}
		return nil
	})
	if err != nil {
		return nil, err
	}
	sort.Slice(result, func(i, j int) bool {
		return result[i].UpdatedTime.After(result[j].UpdatedTime)
	})
	if len(result) > 35 {
		result = result[:35]
	}
	return result, nil
} // todo clean up paths

func getMyFilesRecursive(p string, creator string) ([]File, error) {
	result := []File{}
	files, err := ioutil.ReadDir(p)
	if err != nil {
		return nil, err
	}
	for _, file := range files {
		fullPath := path.Join(p, file.Name())
		f := fileFromPath(fullPath)
		if file.IsDir() {
			f.Children, err = getMyFilesRecursive(path.Join(p, file.Name()), creator)
		}
		result = append(result, f)
	}
	return result, nil
}

func createTablesIfDNE() {
	_, err := DB.Exec(`CREATE TABLE IF NOT EXISTS user (
  id INTEGER PRIMARY KEY NOT NULL,
  username TEXT NOT NULL UNIQUE,
  email TEXT NOT NULL UNIQUE,
  password_hash TEXT NOT NULL,
  reference TEXT NOT NULL default "",
  active boolean NOT NULL DEFAULT false,
  admin boolean NOT NULL DEFAULT false,
  created_at INTEGER DEFAULT (strftime('%s', 'now'))
);

CREATE TABLE IF NOT EXISTS cookie_key (
  value TEXT NOT NULL
);`)
	if err != nil {
		log.Fatal(err)
	}
}

// Generate a cryptographically secure key for the cookie store
func generateCookieKeyIfDNE() []byte {
	rows, err := DB.Query("SELECT value FROM cookie_key LIMIT 1")
	defer rows.Close()
	if err != nil {
		log.Fatal(err)
	}
	if rows.Next() {
		var cookie []byte
		err := rows.Scan(&cookie)
		if err != nil {
			log.Fatal(err)
		}
		return cookie
	} else {
		k := make([]byte, 32)
		_, err := io.ReadFull(rand.Reader, k)
		if err != nil {
			log.Fatal(err)
		}
		_, err = DB.Exec("insert into cookie_key values (?)", k)
		if err != nil {
			log.Fatal(err)
		}
		return k
	}
}