package gime

import (
	"errors"

	"github.com/br0xen/boltease"
)

type GimeDB struct {
	db             *boltease.DB
	archDb         *boltease.DB
	dbOpened       int
	dbArchOpened   int
	path           string
	filename, arch string
}

const (
	TypeCurrent = "current"
	TypeRecent  = "recent"
	TypeArchive = "archive"
	TypeUnknown = "unknown" // Not really a type, used for searches and stuff
)

const AllTypes = []string{TypeCurrent, TypeRecent, TypeArchive}

// Load Database returns a database loaded off the files given
// name and archName located in path
func LoadDatabase(path, name, archName string) (*GimeDB, error) {
	if path[len(path)-1] != '/' {
		path = path + "/"
	}
	gdb := GimeDB{
		path:     path,
		filename: name,
		arch:     archName,
	}
	gdb.initDatabase()
	return &gdb, nil
}

// Load a TimeEntry collection from a database
func (gdb *GimeDB) LoadTimeEntryCollection(tp string) *TimeEntryCollection {
	ret := new(TimeEntryCollection)
	entries := gdb.dbGetAllTimeEntries(tp)
	for i := range entries {
		ret.Push(&entries[i])
	}
	return ret
}

func (gdb *GimeDB) openDatabase() error {
	gdb.dbOpened += 1
	if gdb.dbOpened == 1 {
		var err error
		gdb.db, err = boltease.Create(gdb.path+gdb.filename, 0600, nil)
		if err != nil {
			return err
		}
	}
	return nil
}

func (gdb *GimeDB) closeDatabase() error {
	gdb.dbOpened -= 1
	if gdb.dbOpened == 0 {
		return gdb.db.CloseDB()
	}
	return nil
}

func (gdb *GimeDB) openArchiveDatabase() error {
	gdb.dbArchOpened += 1
	if gdb.dbArchOpened == 1 {
		var err error
		gdb.archDb, err = boltease.Create(gdb.path+gdb.arch, 0600, nil)
		if err != nil {
			return err
		}
	}
	return nil
}

func (gdb *GimeDB) closeArchiveDatabase() error {
	gdb.dbArchOpened -= 1
	if gdb.dbArchOpened == 0 {
		return gdb.archDb.CloseDB()
	}
	return nil
}

func (gdb *GimeDB) initDatabase() error {
	// Initialize the current/recent/settings database
	var err error
	if err = gdb.openDatabase(); err != nil {
		return err
	}
	defer gdb.closeDatabase()
	// Create the path to the bucket to store application settings
	if err := gdb.db.MkBucketPath([]string{"settings"}); err != nil {
		return err
	}
	// Create the path to the bucket to store the current time entry
	if err := gdb.db.MkBucketPath([]string{TypeCurrent}); err != nil {
		return err
	}
	// Create the path to the bucket to store recent time entries
	if err := gdb.db.MkBucketPath([]string{TypeRecent}); err != nil {
		return err
	}

	// Now initialize the Archive Database
	if err = gdb.openArchiveDatabase(); err != nil {
		return err
	}
	defer gdb.closeArchiveDatabase()
	// Create the path to the bucket to store archived time entries
	return gdb.archDb.MkBucketPath([]string{TypeArchive})
}

func (gdb *GimeDB) openDBType(tp string) (*boltease.DB, error) {
	var err error
	if tp == TypeCurrent || tp == TypeRecent {
		if err = gdb.openDatabase(); err != nil {
			return nil, err
		}
		return gdb.db, err
	} else if tp == TypeArchive {
		if err = gdb.openArchiveDatabase(); err != nil {
			return nil, err
		}
		return gdb.archDb, err
	}
	return nil, errors.New("Invalid database type: " + tp)
}

func (gdb *GimeDB) closeDBType(tp string) error {
	if tp == TypeCurrent || tp == TypeRecent {
		return gdb.closeDatabase()
	} else if tp == TypeArchive {
		return gdb.closeArchiveDatabase()
	}
	return errors.New("Invalid database type: " + tp)
}