// 下载页 · Java 分组（G2 的第二个分类）：四家发行版 + 回退链可视化 + 本地运行时。
//
// 回退链是「可观测性」核心：安装失败时用户要能看见 Temurin 跳过 → Oracle 失败 →
// Microsoft 命中的每一步原因（D23），而不是只看到一句「下载失败」。
import { Theme } from "../theme/tokens.slint";
import { Metrics } from "../theme/metrics.slint";
import { UiJavaVendor, UiJavaStep, UiJavaRuntime, JavaStepOutcome } from "../models.slint";
import { PageState } from "../page_state.slint";
import { UiText, TextRole } from "../components/label.slint";
import { Badge } from "../components/badge.slint";
import { AppIcon, IconKind } from "../components/icons.slint";
import { MetroButton, ButtonKind } from "../widgets/button.slint";
import { ScrollView } from "std-widgets.slint";

component ChainStep inherits Rectangle {
    in property <UiJavaStep> step;

    height: 26px;
    background: transparent;

    HorizontalLayout {
        spacing: Metrics.gap-1;

        AppIcon {
            icon-size: 12px;
            kind: root.step.outcome == JavaStepOutcome.hit ? IconKind.check
                : root.step.outcome == JavaStepOutcome.failed ? IconKind.error
                : root.step.outcome == JavaStepOutcome.skip ? IconKind.warn
                : IconKind.more;
            tint: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success
                : root.step.outcome == JavaStepOutcome.failed ? Theme.state-danger
                : Theme.fg-secondary;
        }
        UiText {
            role: TextRole.caption;
            text: root.step.vendor;
            width: 72px;
            color: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success : Theme.fg-primary;
        }
        Badge {
            text: root.step.outcome_label;
            tint: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success
                : root.step.outcome == JavaStepOutcome.failed ? Theme.state-danger
                : Theme.fg-secondary;
        }
        UiText {
            role: TextRole.caption;
            text: root.step.detail;
            horizontal-stretch: 1;
            overflow: elide;
        }
    }
}

component VendorRow inherits Rectangle {
    in property <UiJavaVendor> data;
    callback install();

    height: 56px;
    background: vendor-touch.has-hover ? Theme.bg-hover : transparent;

    HorizontalLayout {
        padding-left: Metrics.gap-3;
        padding-right: Metrics.gap-3;
        spacing: Metrics.gap-2;

        UiText {
            role: TextRole.bodyStrong;
            text: root.data.rank + ". " + root.data.display;
            width: 170px;
        }
        if root.data.installed : Badge { text: "已装"; tint: Theme.state-success; }
        UiText {
            role: TextRole.caption;
            text: "Java " + root.data.majors;
            width: 96px;
        }
        UiText {
            role: TextRole.caption;
            text: root.data.sources;
            horizontal-stretch: 1;
            overflow: elide;
        }
        MetroButton {
            kind: ButtonKind.standard;
            text: "安装此家";
            button-height: 26px;
            enabled: !PageState.java-busy;
            clicked => { root.install(); }
        }
    }

    vendor-touch := TouchArea {
        mouse-cursor: pointer;
        clicked => { root.install(); }
    }
}

export component JavaPanel inherits Rectangle {
    background: Theme.bg-canvas;

    VerticalLayout {
        // 顶栏：地区 / 优先级来源 / 目标大版本 / 一键按回退链安装
        Rectangle {
            height: 56px;
            background: Theme.bg-canvas;

            HorizontalLayout {
                padding-left: Metrics.gap-4;
                padding-right: Metrics.gap-4;
                spacing: Metrics.gap-3;

                UiText {
                    role: TextRole.subtitle;
                    text: "Java 运行时";
                    width: 110px;
                }
                UiText {
                    role: TextRole.caption;
                    text: "地区 " + PageState.java-region + " · 优先级 " + PageState.java-priority-source
                        + " · 目标 Java " + PageState.java-target-major;
                    horizontal-stretch: 1;
                    overflow: elide;
                }
                MetroButton {
                    kind: ButtonKind.accent;
                    text: PageState.java-busy ? "安装中…" : "按回退链安装";
                    button-height: 28px;
                    enabled: !PageState.java-busy;
                    clicked => { PageState.java-install(""); }
                }
            }
        }

        UiText {
            x: Metrics.gap-4;
            role: TextRole.caption;
            text: PageState.java-order;
            horizontal-stretch: 1;
            overflow: elide;
        }

        if PageState.java-message != "" : Rectangle {
            height: 30px;
            background: Theme.accent-soft;
            UiText {
                x: Metrics.gap-4;
                role: TextRole.caption;
                text: PageState.java-message;
                overflow: elide;
            }
        }

        Rectangle { height: 1px; background: Theme.stroke; }

        ScrollView {
            vertical-stretch: 1;

            VerticalLayout {
                padding-bottom: Metrics.gap-4;

                // 回退链
                UiText {
                    x: Metrics.gap-4;
                    role: TextRole.bodyStrong;
                    text: "回退链";
                }
                for step in PageState.java-chain : ChainStep { step: step; }

                UiText {
                    x: Metrics.gap-4;
                    role: TextRole.bodyStrong;
                    text: "四家发行版";
                }
                for vendor in PageState.java-vendors : VendorRow {
                    data: vendor;
                    install => { PageState.java-install(vendor.id); }
                }

                UiText {
                    x: Metrics.gap-4;
                    role: TextRole.bodyStrong;
                    text: "本地已发现";
                }
                if PageState.java-runtimes.length == 0 : UiText {
                    x: Metrics.gap-4;
                    role: TextRole.caption;
                    text: "还没有探测到 Java：点上面的「按回退链安装」装一个托管 JDK。";
                }
                for runtime in PageState.java-runtimes : Rectangle {
                    height: 24px;
                    HorizontalLayout {
                        padding-left: Metrics.gap-4;
                        spacing: Metrics.gap-2;
                        UiText { role: TextRole.caption; text: "Java " + runtime.version; width: 120px; }
                        UiText { role: TextRole.caption; text: runtime.vendor; width: 96px; }
                        UiText { role: TextRole.caption; text: runtime.origin; width: 80px; }
                        UiText { role: TextRole.caption; text: runtime.binary; horizontal-stretch: 1; overflow: elide; }
                    }
                }
            }
        }
    }
}