package database

import (
	"context"
	"os"

	"database/sql"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"go.uber.org/fx"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"sneak.berlin/go/directory/internal/config"
	"sneak.berlin/go/directory/internal/globals"
	"sneak.berlin/go/directory/internal/logger"
	"sneak.berlin/go/util"

	// spooky action at a distance!
	// this populates the environment
	// from a ./.env file automatically
	// for development configuration.
	// .env contents should be things like
	// `DBURL=postgres://user:pass@.../`
	// (without the backticks, of course)
	_ "github.com/joho/godotenv/autoload"
)

type DatabaseParams struct {
	fx.In
	Logger  *logger.Logger
	Config  *config.Config
	Globals *globals.Globals
}

type Database struct {
	URL    string
	log    *zerolog.Logger
	params *DatabaseParams
	DB     *gorm.DB
	SQLDB  *sql.DB
	dbdir  string
	dbfn   string
}

func New(lc fx.Lifecycle, params DatabaseParams) (*Database, error) {
	s := new(Database)
	s.params = &params
	s.log = params.Logger.Get()

	s.log.Info().Msg("Database instantiated")

	lc.Append(fx.Hook{
		OnStart: func(ctx context.Context) error {
			s.log.Info().Msg("Database OnStart Hook")
			// FIXME connect to db
			return nil
		},
		OnStop: func(ctx context.Context) error {
			// FIXME disconnect from db
			return nil
		},
	})
	return s, nil
}

func (d *Database) Close() {
	d.log.Info().Msg("Database Close()")
}

func (d *Database) Get() (*gorm.DB, error) {
	if d.DB == nil {
		err := d.Connect()
		if err != nil {
			d.log.Error().Err(err).Msg("failed to connect to database")
			return nil, err
		}
	}
	return d.DB, nil
}

func (d *Database) Connect() error {
	// FIXME make this get the data dir path from config
	d.dbdir = os.Getenv("HOME")
	err := util.Mkdirp(d.dbdir)
	if err != nil {
		d.log.Error().
			Err(err).
			Str("dbdir", d.dbdir).
			Msg("unable to create directory")
		return err
	}
	d.dbfn = d.dbdir + "/" + d.params.Globals.Appname + ".db"
	d.log.Info().
		Str("file", d.dbfn).
		Msg("opening store db")

	// Open the database using the pure Go SQLite driver
	sqlDB, err := sql.Open("sqlite", d.dbfn+"?_pragma=foreign_keys(1)&_pragma=journal_mode(WAL)")
	if err != nil {
		d.log.Error().Err(err).Msg("failed to open database")
		return err
	}
	d.SQLDB = sqlDB

	// Use the generic Gorm SQL driver to integrate it
	db, err := gorm.Open(sqlite.Dialector{Conn: d.SQLDB}, &gorm.Config{})
	if err != nil {
		log.Error().Err(err).Msg("failed to connect database")
		return err
	}
	d.DB = db

	return nil
}