package cachedb

import (
	`os`
	`path/filepath`

	`github.com/jmoiron/sqlx`
	_ `github.com/mattn/go-sqlite3`
	`r00t2.io/gobroke/conf`
	`r00t2.io/sysutils/paths`
)

/*
	NewCache returns a Cache from path to SQLite file `db` (or ":memory:" for an in-memory one).

	It will be created if it doesn't exist for persistent caches.
*/
func NewCache(db string, perms *conf.Perms) (c *Cache, err error) {

	var cache Cache
	var exists bool

	switch db {
	case ":memory:":
		// NO-OP for now; exists should be false, but it is since it's zero-val.
	default:
		if perms == nil {
			perms = new(conf.Perms)
			if err = perms.SetMissing(); err != nil {
				return
			}
		}
		if exists, err = paths.RealPathExists(&db); err != nil {
			return
		}
		if !exists {
			if err = os.MkdirAll(filepath.Dir(db), *perms.ParentDir.Mode); err != nil {
				return
			}
			if err = os.WriteFile(db, nil, *perms.File.Mode); err != nil {
				return
			}
		}
		if err = perms.Chown(filepath.Dir(db)); err != nil {
			return
		}
		if err = perms.Chmod(filepath.Dir(db), !exists); err != nil {
			return
		}
		if err = perms.Chown(db); err != nil {
			return
		}
		if err = perms.Chmod(db, !exists); err != nil {
			return
		}
	}

	if cache.db, err = sqlx.Connect("sqlite3", db); err != nil {
		return
	}

	if !exists {
		// New DB, so write the schema.
		if _, err = cache.db.Exec(string(schemaBytes)); err != nil {
			return
		}

	}

	c = &cache

	return
}