package fuzz

import (
	"sync"

	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var (
	fuzzDBOnce sync.Once
	fuzzDB     *gorm.DB
	fuzzDBErr  error
)

func GetFuzzDB() (*gorm.DB, error) {
	fuzzDBOnce.Do(func() {
		dbName := "file:memdb_fuzz?mode=memory&cache=shared&_journal_mode=WAL&_synchronous=NORMAL"
		fuzzDB, fuzzDBErr = gorm.Open(sqlite.Open(dbName), &gorm.Config{
			Logger: logger.Default.LogMode(logger.Silent),
		})
		if fuzzDBErr == nil {
			fuzzDBErr = fuzzDB.Exec(`
				CREATE TABLE IF NOT EXISTS users (
					id INTEGER PRIMARY KEY AUTOINCREMENT,
					username TEXT UNIQUE NOT NULL,
					email TEXT UNIQUE NOT NULL,
					password TEXT NOT NULL,
					email_verified INTEGER DEFAULT 0 NOT NULL,
					email_verified_at DATETIME,
					email_verification_token TEXT,
					email_verification_sent_at DATETIME,
					password_reset_token TEXT,
					password_reset_sent_at DATETIME,
					password_reset_expires_at DATETIME,
					locked INTEGER DEFAULT 0,
					session_version INTEGER DEFAULT 1 NOT NULL,
					created_at DATETIME,
					updated_at DATETIME,
					deleted_at DATETIME
				);
				CREATE TABLE IF NOT EXISTS posts (
					id INTEGER PRIMARY KEY AUTOINCREMENT,
					title TEXT NOT NULL,
					url TEXT UNIQUE,
					content TEXT,
					author_id INTEGER,
					author_name TEXT,
					up_votes INTEGER DEFAULT 0,
					down_votes INTEGER DEFAULT 0,
					score INTEGER DEFAULT 0,
					created_at DATETIME,
					updated_at DATETIME,
					deleted_at DATETIME,
					FOREIGN KEY(author_id) REFERENCES users(id)
				);
				CREATE TABLE IF NOT EXISTS votes (
					id INTEGER PRIMARY KEY AUTOINCREMENT,
					user_id INTEGER,
					post_id INTEGER NOT NULL,
					type TEXT NOT NULL,
					vote_hash TEXT,
					created_at DATETIME,
					updated_at DATETIME,
					FOREIGN KEY(user_id) REFERENCES users(id),
					FOREIGN KEY(post_id) REFERENCES posts(id)
				);
				CREATE TABLE IF NOT EXISTS account_deletion_requests (
					id INTEGER PRIMARY KEY AUTOINCREMENT,
					user_id INTEGER NOT NULL,
					token_hash TEXT UNIQUE NOT NULL,
					expires_at DATETIME NOT NULL,
					created_at DATETIME,
					FOREIGN KEY(user_id) REFERENCES users(id)
				);
				CREATE TABLE IF NOT EXISTS refresh_tokens (
					id INTEGER PRIMARY KEY AUTOINCREMENT,
					user_id INTEGER NOT NULL,
					token_hash TEXT UNIQUE NOT NULL,
					expires_at DATETIME NOT NULL,
					created_at DATETIME,
					FOREIGN KEY(user_id) REFERENCES users(id)
				);
			`).Error
		}
	})
	return fuzzDB, fuzzDBErr
}