package store

import (
	"fmt"

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

// Open opens (or creates) the SQLite database at path and runs GORM
// AutoMigrate for all models. SQLite with WAL is used for single-instance
// durability; the abstraction lives entirely in this package so a future
// migration to Postgres stays localised.
func Open(path string) (*gorm.DB, error) {
	// _busy_timeout helps under concurrent writes; _foreign_keys enforces FK
	// constraints that GORM expects; _journal_mode=WAL improves read/write
	// concurrency for the single-file database.
	dsn := fmt.Sprintf("%s?_busy_timeout=5000&_foreign_keys=on&_journal_mode=WAL", path)
	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{
		// Silent: our handlers emit their own HTTP errors and frequently run
		// "first-or-create" / 404 lookups whose ErrRecordNotFound would
		// otherwise spam the operator's logs.
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		return nil, fmt.Errorf("open sqlite: %w", err)
	}

	if err := db.AutoMigrate(
		&AdminUser{},
		&App{},
		&ModelConfig{},
		&Skill{},
		&Session{},
		&Message{},
		&AuditLog{},
	); err != nil {
		return nil, fmt.Errorf("auto-migrate: %w", err)
	}

	// Compound uniqueness: a skill slug is unique per app. Enforced in code
	// to avoid depending on DB-specific index syntax during migration.
	return db, nil
}