//
//  GRDBDatabaseManager.swift
//  FluxRead
//
//  Created on 16/12/2025.
//

import Foundation
import GRDB

class GRDBDatabaseManager {

    private var dbQueue: DatabaseQueue?

    init() {
        do {
            try setupDatabase()
        } catch {
            print("❌ Failed to setup GRDB database: \(error)")
        }
    }

    // MARK: - Database Setup

    private func setupDatabase() throws {
        let fileManager = FileManager.default
        let documentsPath = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let dbPath = documentsPath.appendingPathComponent("fluxread_grdb.sqlite").path

        // Create database queue
        dbQueue = try DatabaseQueue(path: dbPath)

        // Create tables
        try dbQueue?.write { db in
            try createTables(db)
        }
    }

    private func createTables(_ db: Database) throws {

        /*
        try db.create(table: GRDBComicBookFile.databaseTableName, ifNotExists: true) { t in

            t.column("fileHash", .text).primaryKey()
            t.column("name", .text).notNull()
            t.column("fileSize", .integer).notNull()
            t.column("dateAdded", .datetime).notNull()
            t.column("filePath", .text).notNull()
            t.column("numberOfPages", .integer).notNull()

            t.column("pageCount", .integer)

            t.column("lastReadDate", .datetime).indexed()
            t.column("issueDate", .datetime)
            t.column("isRead", .boolean).notNull().defaults(to: false).indexed()
            t.column("readCompletion", .integer).notNull().defaults(to: 0).indexed()
            t.column("syncDate", .datetime).indexed()
            t.column("estimatedProcessingDate", .datetime)

            t.column("providerId", .text)
            t.column("providerPath", .text)
            t.column("isAvailableLocally", .boolean).indexed()
            t.column("parentFileHash", .text).indexed()

        }

        try db.create(table: GRDBComicBookPage.databaseTableName, ifNotExists: true) { t in
            t.column("comicBookId", .text).notNull()
                .indexed()

            t.column("fileHash", .text).notNull()
            t.column("pageNumber", .integer).notNull().indexed()
            t.column("syncDate", .datetime).indexed()
            t.primaryKey(["comicBookId", "fileHash"])

        }

        try db.create(table: GRDBComicBookPagePanel.databaseTableName, ifNotExists: true) { t in
            t.column("comicBookId", .text).notNull()
                .indexed()
            t.column("comicBookPageId", .text).notNull()
            .indexed()
            t.column("panelNumberInPage", .integer).notNull()
            t.column("pageNumber", .integer).notNull()
            t.column("left", .integer).notNull()
            t.column("top", .integer).notNull()
            t.column("right", .integer).notNull()
            t.column("bottom", .integer).notNull()
            t.column("syncDate", .datetime).indexed()
            t.primaryKey(["comicBookId", "comicBookPageId", "panelNumberInPage", "pageNumber"])
        }

        try db.create(table: GRDBComicBookTitle.databaseTableName, ifNotExists: true) { t in
            t.column("id", .text).primaryKey()
            t.column("name", .text).notNull()
            t.column("age", .integer).notNull()
        }

        try db.create(table: GRDBComicBookPageReadingStat.databaseTableName, ifNotExists: true) { t in
            t.column("comicBookId", .text).notNull().indexed()
            t.column("comicBookPageId", .text).notNull().indexed()
            t.column("comicBookPageNumber", .integer).notNull().indexed()
            t.column("startDate", .datetime).notNull()
            t.column("endDate", .datetime).notNull()
            t.column("numberOfSeconds", .integer).notNull()
            t.column("syncDate", .datetime).indexed()
            t.primaryKey(["comicBookId", "comicBookPageId", "comicBookPageNumber", "startDate"])
        }

        try db.create(table: LibraryImportProvider.databaseTableName, ifNotExists: true) { t in
            t.column("providerId", .text).primaryKey()
            t.column("connectionName", .text).notNull()
            t.column("providerType", .integer).notNull()
            t.column("hostName", .text).notNull()
            t.column("port", .integer).notNull()
            t.column("username", .text).notNull()
            t.column("path", .text).notNull()
            t.column("authenticationType", .integer).notNull()

        }
        try db.create(table: ComicBookMetaDataAttribute.databaseTableName, ifNotExists: true) { t in
            t.column("attributeId", .integer).notNull()
            t.column("attributeValue", .text).notNull()
            t.column("attributeType", .integer).notNull()

        }

        try db.create(table: ComicBookMetaDataAttributeRelation.databaseTableName, ifNotExists: true) { t in
            t.column("attributeId", .integer).notNull()
            t.column("comicBookId", .text).notNull()
            t.primaryKey(["attributeId", "comicBookId"])

        }

        try db.create(table: ComicBookMetadata.databaseTableName, ifNotExists: true) { t in
            t.column("comicBookId", .text).primaryKey()
            t.column("creationDate", .datetime).notNull()

            t.column("metadata", .text).notNull()

        }

        try db.create(table: GRDBComicBookPagePanelText.databaseTableName, ifNotExists: true) { t in

            t.column("comicBookId", .text).notNull()
            t.column("comicBookPageId", .integer).notNull()
            t.column("textBlockNumber", .integer).notNull()
            t.column("textBlock", .text).notNull()
            t.column("left", .double).notNull()
            t.column("top", .double).notNull()
            t.column("right", .double).notNull()
            t.column("bottom", .double).notNull()
            t.primaryKey(["comicBookId", "comicBookPageId", "textBlockNumber"])

        }

        try db.create(table: UserActivity.databaseTableName, ifNotExists: true) { t in

            t.column("activityId", .integer).primaryKey()

            t.column("activityType", .integer).notNull()
            t.column("creationDate", .datetime).notNull()
            t.column("activityDescription", .text)
            t.column("comicId", .integer)
            t.column("activityDetail", .text)

        }

        try db.create(table: SavedSearch.databaseTableName, ifNotExists: true) { t in

            t.column("id", .text).primaryKey()
            t.column("query", .text).notNull()
            t.column("attributeId", .integer).notNull().indexed()

        }

        try db.create(table: SavedSearchComic.databaseTableName, ifNotExists: true) { t in

            t.column("id", .text).primaryKey()
            t.column("savedSearchId", .text).notNull().indexed()
            t.column("comicId", .text).notNull()

        }

         */
       
        
    }

    // MARK: - Public Access

    func getDatabase() -> DatabaseQueue? {
        return dbQueue
    }

    func write<T>(_ updates: (Database) throws -> T) throws -> T {
        guard let dbQueue = dbQueue else {
            throw DatabaseError.notInitialized
        }
        return try dbQueue.write(updates)
    }

    func read<T>(_ value: (Database) throws -> T) throws -> T {
        guard let dbQueue = dbQueue else {
            throw DatabaseError.notInitialized
        }
        return try dbQueue.read(value)
    }

    // MARK: - Error Types

    enum DatabaseError: Error {
        case notInitialized
        case recordNotFound
        case insertFailed
        case updateFailed
        case deleteFailed
    }
}