import Foundation

// Mirrors Kotlin MibFinancingClient exactly.
// Fetches the /financing?dashurl=1 HTML page and parses finance-card-holder data attributes.
actor MibFinancingClient {

    private let wvBase = "https://faisamobilex-wv.mib.com.mv"
    private let session: MibSession

    private let urlSession: URLSession = {
        let cfg = URLSessionConfiguration.ephemeral
        cfg.timeoutIntervalForRequest = 30
        cfg.timeoutIntervalForResource = 60
        return URLSession(configuration: cfg)
    }()

    init(session: MibSession) {
        self.session = session
    }

    func fetchFinancing() async throws -> [MibFinanceDeal] {
        var req = URLRequest(url: URL(string: "\(wvBase)/financing?dashurl=1")!)
        req.setValue(cookieHeader, forHTTPHeaderField: "Cookie")
        req.setValue(
            "Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148",
            forHTTPHeaderField: "User-Agent"
        )
        req.setValue("mv.com.mib.faisamobilex", forHTTPHeaderField: "X-Requested-With")

        let (data, response) = try await urlSession.data(for: req)
        let code = (response as? HTTPURLResponse)?.statusCode ?? 0
        if code == 419 { throw MibError.sessionExpired }
        if code >= 500 { throw MibError.networkError("HTTP \(code)") }

        guard let html = String(data: data, encoding: .utf8) else { return [] }
        return parseHtml(html)
    }

    // MARK: - HTML parsing (mirrors Kotlin regex approach)

    private func parseHtml(_ html: String) -> [MibFinanceDeal] {
        guard let cardRe = try? NSRegularExpression(pattern: #"finance-card-holder[^>]+>"#),
              let attrRe = try? NSRegularExpression(pattern: #"data-(\w+)\s*=\s*"([^"]*)""#) else {
            return []
        }

        let ns = html as NSString
        return cardRe.matches(in: html, range: NSRange(location: 0, length: ns.length)).compactMap { m in
            let cardStr = ns.substring(with: m.range)
            let cardNS  = cardStr as NSString
            var attrs: [String: String] = [:]
            attrRe.matches(in: cardStr, range: NSRange(location: 0, length: cardNS.length)).forEach { a in
                let key = cardNS.substring(with: a.range(at: 1))
                let val = cardNS.substring(with: a.range(at: 2))
                attrs[key] = val
            }
            guard let dealNo = attrs["dealNo"] else { return nil }
            return MibFinanceDeal(
                dealNo:            dealNo,
                productDesc:       attrs["productDesc"]       ?? "",
                dealStatus:        attrs["dealStatus"]        ?? "",
                statusDesc:        attrs["statusDesc"]        ?? "",
                dealAmount:        Double(attrs["dealAmount"]        ?? "") ?? 0,
                paidAmount:        Double(attrs["paidAmount"]        ?? "") ?? 0,
                outstandingAmount: Double(attrs["outstandingAmount"] ?? "") ?? 0,
                dealDate:          attrs["dealDate"]          ?? "",
                overdueAmount:     Double(attrs["overdueAmount"]     ?? "") ?? 0,
                installmentAmount: Double(attrs["installmentAmount"] ?? "") ?? 0,
                noOfInstallments:  Int(attrs["noOfInstallments"]     ?? "") ?? 0,
                lastPaidDate:      attrs["lastPaidDate"]      ?? "",
                lastPayAmount:     Double(attrs["lastPayAmount"]     ?? "") ?? 0,
                currency:          attrs["curCodeDesc"]       ?? "MVR"
            )
        }
    }

    private var cookieHeader: String {
        "mbmodel=IOS-1.0; xxid=\(session.xxid); IBSID=\(session.xxid); mbnonce=\(session.nonceGenerator); time-tracker=597"
    }
}