import { VerticalBox, HorizontalBox, ComboBox, TextEdit } from "std-widgets.slint";
import { Button } from "button.slint";
import { AppTheme } from "../design-system.slint";
import { TypeScale } from "../typography.slint";

// Standard server ports. A port follows the chosen protocol or security only
// while it still holds a standard port, so a custom port is never overwritten.
export global MailPorts {
    public pure function incoming(protocol: string, security: string) -> string {
        if protocol == "pop3" {
            return security == "tls" ? "995" : "110";
        }
        return security == "tls" ? "993" : "143";
    }

    public pure function smtp(security: string) -> string {
        return security == "tls" ? "465" : "587";
    }

    public pure function is-standard-incoming(port: string) -> bool {
        return port == "993" || port == "143" || port == "995" || port == "110";
    }
}

// The same account-scoped transport settings are used during setup and edits.
export component MailSecurityFields inherits VerticalBox {
    // "imap" or "pop3".
    in property <string> incoming-protocol: "imap";
    in-out property <string> incoming-security: "tls";
    in-out property <string> smtp-security: "tls";
    in-out property <string> incoming-port: "993";
    in-out property <string> smtp-port: "465";
    in-out property <string> certificate-pem;
    in property <bool> enabled: true;
    callback import-certificate();
    private property <bool> certificate-expanded: false;
    private property <bool> uses-tls: root.incoming-security != "none" || root.smtp-security != "none";
    spacing: 8px;
    padding: 0px;
    vertical-stretch: 0;

    pure function security-index(security: string) -> int {
        return security == "starttls" ? 1 : security == "none" ? 2 : 0;
    }

    pure function security-at(index: int) -> string {
        return index == 1 ? "starttls" : index == 2 ? "none" : "tls";
    }

    function choose-incoming-security(security: string) {
        if (root.incoming-port == MailPorts.incoming(root.incoming-protocol, root.incoming-security)) {
            root.incoming-port = MailPorts.incoming(root.incoming-protocol, security);
        }
        root.incoming-security = security;
    }

    function choose-smtp-security(security: string) {
        if (root.smtp-port == MailPorts.smtp(root.smtp-security)) {
            root.smtp-port = MailPorts.smtp(security);
        }
        root.smtp-security = security;
    }

    // Choosing an item replaces a selector's binding. These keep both showing
    // values set later, such as a reset form or a suggested server.
    changed incoming-security => {
        incoming-encryption.current-index = root.security-index(root.incoming-security);
    }
    changed smtp-security => {
        smtp-encryption.current-index = root.security-index(root.smtp-security);
    }

    Text { text: @tr("Connection security"); color: AppTheme.heading; font-size: TypeScale.secondary; font-weight: 600; }
    HorizontalBox {
        height: 58px;
        min-width: 0px;
        padding: 0px;
        spacing: 8px;
        // Equal columns whatever each selection's label length.
        VerticalBox {
            min-width: 0px;
            preferred-width: 0px;
            horizontal-stretch: 1;
            padding: 0px;
            spacing: 4px;
            Text { text: root.incoming-protocol == "pop3" ? @tr("POP3 encryption") : @tr("IMAP encryption"); color: AppTheme.secondary; font-size: TypeScale.caption; }
            incoming-encryption := ComboBox {
                height: 36px;
                min-width: 0px;
                enabled: root.enabled;
                model: ["SSL/TLS", "STARTTLS", @tr("None (unencrypted)")];
                current-index: root.security-index(root.incoming-security);
                selected(value) => { root.choose-incoming-security(root.security-at(self.current-index)); }
            }
        }
        VerticalBox {
            min-width: 0px;
            preferred-width: 0px;
            horizontal-stretch: 1;
            padding: 0px;
            spacing: 4px;
            Text { text: @tr("SMTP encryption"); color: AppTheme.secondary; font-size: TypeScale.caption; }
            smtp-encryption := ComboBox {
                height: 36px;
                min-width: 0px;
                enabled: root.enabled;
                model: ["SSL/TLS", "STARTTLS", @tr("None (unencrypted)")];
                current-index: root.security-index(root.smtp-security);
                selected(value) => { root.choose-smtp-security(root.security-at(self.current-index)); }
            }
        }
    }
    if root.incoming-security == "none" || root.smtp-security == "none" : Text {
        text: @tr("Without encryption, anyone on the network can read your password and mail. Use this only with a server on a network you trust.");
        color: AppTheme.destructive; font-size: TypeScale.caption; wrap: word-wrap; height: self.preferred-height;
    }
    if root.uses-tls : Button {
        height: 36px;
        text: root.certificate-pem != "" ? @tr("Manage trusted certificate") : @tr("Custom server certificate…");
        label-overflow: elide;
        enabled: root.enabled;
        clicked => { root.certificate-expanded = !root.certificate-expanded; }
    }
    if root.uses-tls && root.certificate-expanded : VerticalBox {
        padding: 0px;
        spacing: 8px;
        Text {
            text: @tr("For Proton Bridge, export its certificate from Bridge settings and import it here. Only trust certificates from your server administrator. Server names and expiry dates are still checked.");
            color: AppTheme.secondary; font-size: TypeScale.caption; wrap: word-wrap; height: self.preferred-height;
        }
        Button { height: 36px; text: @tr("Import certificate file"); label-overflow: elide; enabled: root.enabled; clicked => { root.import-certificate(); } }
        TextEdit { height: 90px; enabled: root.enabled; text <=> root.certificate-pem; wrap: word-wrap; }
        Text { text: @tr("PEM certificate only. Do not paste a private key."); color: AppTheme.secondary; font-size: TypeScale.caption; wrap: word-wrap; height: self.preferred-height; }
        if root.certificate-pem != "" : Button { height: 36px; text: @tr("Remove certificate"); label-overflow: elide; enabled: root.enabled; clicked => { root.certificate-pem = ""; } }
    }
    if root.uses-tls && root.certificate-pem != "" && !root.certificate-expanded : Text {
        text: @tr("Custom certificate added for this account."); color: AppTheme.secondary; font-size: TypeScale.caption; wrap: word-wrap; height: self.preferred-height;
    }
}