//! `FeeBandPreview` — M-Pesa fee band preview card.

use makepad_widgets::*;
use robius_ussd::{TransactionKind, mpesa_band_for_kind_amount, mpesa_fee_for_kind_amount};

#[derive(Script, ScriptHook, Widget)]
pub struct FeeBandPreview {
    #[deref]
    view: View,
}

impl Widget for FeeBandPreview {
    fn handle_event(&mut self, cx: &mut Cx, event: &Event, scope: &mut Scope) {
        self.view.handle_event(cx, event, scope);
    }
    fn draw_walk(&mut self, cx: &mut Cx2d, scope: &mut Scope, walk: Walk) -> DrawStep {
        self.view.draw_walk(cx, scope, walk)
    }
}

impl FeeBandPreviewRef {
    /// Updates the band + fee labels for the given kind + amount.
    pub fn update(&self, cx: &mut Cx, kind: TransactionKind, amount: u64) {
        if let Some(inner) = self.borrow() {
            let band_text = match mpesa_band_for_kind_amount(kind, amount) {
                Some(b) => {
                    let fee = b.fee;
                    if fee == 0 {
                        format!("Band: KSh {}–{}  →  Fee: Free", b.min, b.max)
                    } else {
                        format!("Band: KSh {}–{}  →  Fee: KSh {}", b.min, b.max, fee)
                    }
                }
                None => {
                    if amount == 0 {
                        "Band: —  →  Fee: — (enter amount)".to_string()
                    } else {
                        format!("KSh {} outside supported range", amount)
                    }
                }
            };
            inner.view.label(cx, ids!(band_label)).set_text(cx, &band_text);

            let fee_text = match mpesa_fee_for_kind_amount(kind, amount) {
                Some(0)  => "Free".to_string(),
                Some(f)  => format!("KSh {}", f),
                None     => "—".to_string(),
            };
            inner.view.label(cx, ids!(fee_label)).set_text(cx, &fee_text);
        }
    }
}

script_mod! {
    use mod.prelude.widgets.*
    use mod.widgets.*

    mod.widgets.FeeBandPreview = #(FeeBandPreview::register_widget(vm)) {
        ..mod.widgets.RoundedView
        width: Fill, height: Fit
        flow: Down, spacing: 4
        padding: 12
        show_bg: true
        draw_bg +: {
            color: #xFFFFFF12
            border_radius: 12.0
            border_size: 1.0
            border_color: #xFFFFFF20
        }
        band_label := Label {
            width: Fill
            text: "Band: —  →  Fee: — (enter amount)"
            draw_text +: { color: #xB7B7B7, text_style: theme.font_regular { font_size: 11.0 } }
        }
        fee_label := Label {
            width: Fit
            text: "—"
            draw_text +: { color: #x138808, text_style: theme.font_bold { font_size: 16.0 } }
        }
    }
}