use std::collections::{HashMap, HashSet};
use std::path::{Path, PathBuf};

use iced::widget::text::Shaping;
use iced::widget::{Space, button, column, container, mouse_area, row, stack, text};
use iced::{Alignment, Background, Color, Element, Length, Padding, Theme};

use bds_core::engine::git::GitCommit;
use bds_core::i18n::UiLocale;
use bds_core::model::{ChatConversation, ImportDefinition, Media, Post, Project, Script, Template};

use crate::app::Message;
use crate::state::navigation::{OutputEntry, PanelTab, SidebarView, TaskSnapshot};
use crate::state::sidebar_filter::{MediaFilter, PostFilter};
use crate::state::tabs::{Tab, TabType};
use crate::state::toast::Toast;
use crate::views::{
    activity_bar,
    chat_view::{self, ChatEditorState},
    dashboard::DashboardState,
    documentation::{self, DocumentationState},
    duplicates::{self, DuplicatesState},
    git::{self, GitDiffState, GitUiState},
    media_editor::{self, MediaEditorState},
    menu_editor::{self, MenuEditorState},
    metadata_diff::{self, MetadataDiffState},
    modal, panel,
    post_editor::{self, PostEditorState},
    project_selector,
    script_editor::{self, ScriptEditorState},
    settings_view::{self, SettingsViewState},
    sidebar,
    site_validation::{self, SiteValidationState},
    status_bar, tab_bar,
    tags_view::{self, TagsViewState},
    template_editor::{self, TemplateEditorState},
    toast,
    translation_validation::{self, TranslationValidationState},
    welcome,
};

/// Main content area background.
fn content_bg(_theme: &Theme) -> container::Style {
    container::Style {
        background: Some(Background::Color(Color::from_rgb(0.11, 0.11, 0.14))),
        ..container::Style::default()
    }
}

/// Sidebar resize drag handle style.
fn drag_handle_style(_theme: &Theme) -> container::Style {
    container::Style {
        background: Some(Background::Color(Color::from_rgb(0.25, 0.25, 0.30))),
        ..container::Style::default()
    }
}

/// Horizontal line separator (full width).
fn separator_h<'a>() -> Element<'a, Message> {
    container(Space::new(0, 0))
        .width(Length::Fill)
        .height(Length::Fixed(1.0))
        .style(|_theme: &Theme| container::Style {
            background: Some(Background::Color(Color::from_rgb(0.25, 0.25, 0.30))),
            ..container::Style::default()
        })
        .into()
}

/// Compose the full workspace layout.
#[expect(
    clippy::too_many_arguments,
    reason = "root Iced view receives the application state explicitly"
)]
pub fn view<'a>(
    // Navigation
    sidebar_view: SidebarView,
    sidebar_visible: bool,
    sidebar_width: f32,
    // Tabs
    tabs: &'a [Tab],
    active_tab: Option<&'a str>,
    // Panel
    panel_visible: bool,
    panel_tab: PanelTab,
    task_snapshots: &'a [TaskSnapshot],
    collapsed_task_groups: &'a HashSet<String>,
    output_entries: &'a [OutputEntry],
    // Sidebar data
    sidebar_posts: &'a [Post],
    sidebar_media: &'a [Media],
    sidebar_scripts: &'a [Script],
    sidebar_templates: &'a [Template],
    sidebar_imports: &'a [ImportDefinition],
    chat_conversations: &'a [ChatConversation],
    // Sidebar filters
    post_filter: &'a PostFilter,
    media_filter: &'a MediaFilter,
    // Pre-resolved media thumbnail paths
    sidebar_media_thumbs: &'a HashMap<String, Option<PathBuf>>,
    // Pagination
    sidebar_posts_has_more: bool,
    sidebar_media_has_more: bool,
    // Status bar
    active_project_name: Option<&'a str>,
    projects: &'a [Project],
    active_project_id: Option<&'a str>,
    post_count: usize,
    media_count: usize,
    offline_mode: bool,
    locale_dropdown_open: bool,
    project_dropdown_open: bool,
    theme_badge: &'a str,
    // i18n
    locale: UiLocale,
    // Toasts
    toasts: &'a [Toast],
    // Modal
    active_modal: Option<modal::ModalState>,
    // Data directory (for thumbnail paths)
    data_dir: Option<&'a Path>,
    post_preview_widget: Option<Element<'a, Message>>,
    // Editor states
    post_editors: &'a HashMap<String, PostEditorState>,
    media_editors: &'a HashMap<String, MediaEditorState>,
    template_editors: &'a HashMap<String, TemplateEditorState>,
    script_editors: &'a HashMap<String, ScriptEditorState>,
    import_editors: &'a HashMap<String, crate::views::import_editor::ImportEditorState>,
    chat_editors: &'a HashMap<String, ChatEditorState>,
    tags_view_state: Option<&'a TagsViewState>,
    settings_state: Option<&'a SettingsViewState>,
    dashboard_state: Option<&'a DashboardState>,
    site_validation_state: &'a SiteValidationState,
    duplicates_state: &'a DuplicatesState,
    guide_documentation: &'a DocumentationState,
    api_documentation: &'a DocumentationState,
    metadata_diff_state: &'a MetadataDiffState,
    menu_editor_state: &'a MenuEditorState,
    translation_validation_state: &'a TranslationValidationState,
    git_state: &'a GitUiState,
    git_diffs: &'a HashMap<String, GitDiffState>,
    git_file_history: &'a [GitCommit],
) -> Element<'a, Message> {
    // Activity bar (leftmost column)
    let activity = activity_bar::view(sidebar_view, sidebar_visible, locale);

    // Tab bar
    let tabs_el = tab_bar::view(tabs, active_tab, locale);

    // Content area — route based on active tab type
    let content_area = route_content_area(
        tabs,
        active_tab,
        locale,
        offline_mode,
        data_dir,
        post_preview_widget,
        post_editors,
        media_editors,
        template_editors,
        script_editors,
        import_editors,
        chat_editors,
        tags_view_state,
        settings_state,
        dashboard_state,
        site_validation_state,
        duplicates_state,
        guide_documentation,
        api_documentation,
        metadata_diff_state,
        menu_editor_state,
        translation_validation_state,
        git_diffs,
    );

    // Right column: tab bar + content + panel
    let mut right_col = column![tabs_el, content_area];
    if panel_visible {
        // Determine active tab type for panel tab availability (per layout.allium PanelTabAvailability)
        let active_tab_type = active_tab
            .and_then(|id| tabs.iter().find(|t| t.id == id))
            .map(|t| &t.tab_type);
        let active_tab_is_post = active_tab_type == Some(&TabType::Post);
        let active_tab_is_post_or_media =
            active_tab_is_post || active_tab_type == Some(&TabType::Media);
        let (post_outlinks, post_backlinks) = active_tab
            .and_then(|id| post_editors.get(id))
            .map(|editor| (editor.outlinks.as_slice(), editor.backlinks.as_slice()))
            .unwrap_or((&[], &[]));

        right_col = right_col.push(separator_h());
        right_col = right_col.push(panel::view(
            panel_tab,
            task_snapshots,
            collapsed_task_groups,
            output_entries,
            post_outlinks,
            post_backlinks,
            locale,
            active_tab_is_post,
            active_tab_is_post_or_media,
            git_file_history,
        ));
    }
    let right = container(right_col.width(Length::Fill).height(Length::Fill))
        .width(Length::Fill)
        .height(Length::Fill)
        .style(content_bg);

    // Main row: activity bar | sidebar? | drag handle | right column
    let mut main_row = row![activity];

    if sidebar_visible {
        main_row = main_row.push(sidebar::view(
            sidebar_view,
            sidebar_posts,
            sidebar_media,
            sidebar_scripts,
            sidebar_templates,
            sidebar_imports,
            chat_conversations,
            post_filter,
            media_filter,
            sidebar_media_thumbs,
            sidebar_posts_has_more,
            sidebar_media_has_more,
            sidebar_width,
            active_tab,
            locale,
            data_dir,
            git_state,
            offline_mode,
        ));

        // Resize drag handle: 4px wide strip between sidebar and content
        let handle = container(Space::new(0, 0))
            .width(Length::Fixed(4.0))
            .height(Length::Fill)
            .style(drag_handle_style);

        // Only on_press here; move/release are captured by a global
        // subscription so dragging works even when the cursor leaves
        // the narrow 4px handle strip.
        let handle_hover = mouse_area(handle)
            .on_press(Message::SidebarResizeStart)
            .interaction(iced::mouse::Interaction::ResizingHorizontally);

        main_row = main_row.push(handle_hover);
    }

    main_row = main_row.push(right);
    let main_row = main_row.height(Length::Fill);

    // Status bar at bottom — determine active post status for status dot
    let active_post_status: Option<String> = active_tab
        .and_then(|id| {
            tabs.iter()
                .find(|t| t.id == id && t.tab_type == TabType::Post)
        })
        .and_then(|tab| {
            sidebar_posts
                .iter()
                .find(|p| p.id == tab.id)
                .map(|p| match p.status {
                    bds_core::model::PostStatus::Draft => "draft".to_string(),
                    bds_core::model::PostStatus::Published => "published".to_string(),
                    bds_core::model::PostStatus::Archived => "archived".to_string(),
                })
        });

    let status = status_bar::view(
        active_project_name,
        post_count,
        media_count,
        locale,
        offline_mode,
        task_snapshots,
        theme_badge,
        active_post_status.as_deref(),
        active_tab
            .and_then(|id| chat_editors.get(id))
            .map(ChatEditorState::token_totals),
    );

    let base_layout: Element<'a, Message> = column![main_row, separator_h(), status]
        .width(Length::Fill)
        .height(Length::Fill)
        .into();

    // Overlay: either locale dropdown or project dropdown (mutually exclusive)
    let overlay: Option<Element<'a, Message>> = if locale_dropdown_open {
        let items: Vec<Element<'a, Message>> = UiLocale::all()
            .iter()
            .map(|&l| {
                let flag_text = text(l.flag_emoji()).size(16).shaping(Shaping::Advanced);

                button(flag_text)
                    .on_press(Message::SetUiLocale(l))
                    .padding([4, 8])
                    .style(status_bar::dropdown_item)
                    .into()
            })
            .collect();

        let dropdown_menu = container(
            iced::widget::Column::with_children(items)
                .spacing(2)
                .padding(4),
        )
        .style(status_bar::dropdown_bg);

        // Position at bottom-right, above status bar
        Some(
            container(
                container(row![
                    Space::with_width(Length::Fill),
                    dropdown_menu,
                    Space::with_width(Length::Fixed(40.0)),
                ])
                .width(Length::Fill)
                .align_y(Alignment::End)
                .padding(Padding {
                    top: 0.0,
                    right: 0.0,
                    bottom: 25.0,
                    left: 0.0,
                }),
            )
            .width(Length::Fill)
            .height(Length::Fill)
            .align_y(Alignment::End)
            .into(),
        )
    } else if project_dropdown_open {
        let dropdown = project_selector::view(projects, active_project_id, locale);

        // Position at bottom-left, above status bar
        Some(
            container(
                container(row![
                    Space::with_width(Length::Fixed(8.0)),
                    dropdown,
                    Space::with_width(Length::Fill),
                ])
                .width(Length::Fill)
                .align_y(Alignment::End)
                .padding(Padding {
                    top: 0.0,
                    right: 0.0,
                    bottom: 25.0,
                    left: 0.0,
                }),
            )
            .width(Length::Fill)
            .height(Length::Fill)
            .align_y(Alignment::End)
            .into(),
        )
    } else {
        None
    };

    // Collect overlays: dropdowns and toasts
    let mut overlays: Vec<Element<'a, Message>> = Vec::new();

    if let Some(toast_overlay) = toast::view(toasts) {
        overlays.push(toast_overlay);
    }

    if let Some(overlay) = overlay {
        overlays.push(overlay);
    }

    // Modal overlay (highest z-index)
    if let Some(modal_state) = active_modal {
        overlays.push(modal::view(modal_state, locale, data_dir));
    }

    if overlays.is_empty() {
        base_layout
    } else {
        let mut layers = vec![base_layout];
        layers.extend(overlays);
        stack(layers)
            .width(Length::Fill)
            .height(Length::Fill)
            .into()
    }
}

/// Route the content area based on the active tab type.
#[expect(
    clippy::too_many_arguments,
    reason = "router receives the state required by each routed view"
)]
fn route_content_area<'a>(
    tabs: &'a [Tab],
    active_tab: Option<&'a str>,
    locale: UiLocale,
    offline_mode: bool,
    data_dir: Option<&'a Path>,
    post_preview_widget: Option<Element<'a, Message>>,
    post_editors: &'a HashMap<String, PostEditorState>,
    media_editors: &'a HashMap<String, MediaEditorState>,
    template_editors: &'a HashMap<String, TemplateEditorState>,
    script_editors: &'a HashMap<String, ScriptEditorState>,
    import_editors: &'a HashMap<String, crate::views::import_editor::ImportEditorState>,
    chat_editors: &'a HashMap<String, ChatEditorState>,
    tags_view_state: Option<&'a TagsViewState>,
    settings_state: Option<&'a SettingsViewState>,
    dashboard_state: Option<&'a DashboardState>,
    site_validation_state: &'a SiteValidationState,
    duplicates_state: &'a DuplicatesState,
    guide_documentation: &'a DocumentationState,
    api_documentation: &'a DocumentationState,
    metadata_diff_state: &'a MetadataDiffState,
    menu_editor_state: &'a MenuEditorState,
    translation_validation_state: &'a TranslationValidationState,
    git_diffs: &'a HashMap<String, GitDiffState>,
) -> Element<'a, Message> {
    match route_kind(
        tabs,
        active_tab,
        post_editors,
        media_editors,
        template_editors,
        script_editors,
        import_editors,
        tags_view_state,
        settings_state,
        dashboard_state,
        site_validation_state,
    ) {
        ContentRoute::Dashboard(state) => crate::views::dashboard::view(state, locale),
        ContentRoute::Welcome => welcome::view(locale),
        ContentRoute::Loading => loading_view(locale),
        ContentRoute::Post(tab_id) => {
            if let Some(state) = post_editors.get(tab_id) {
                let wrap = settings_state.map(|s| s.wrap_long_lines).unwrap_or(true);
                post_editor::view(
                    state,
                    locale,
                    wrap,
                    is_ai_enabled(settings_state, offline_mode),
                    post_preview_widget,
                )
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Media(tab_id) => {
            if let Some(state) = media_editors.get(tab_id) {
                media_editor::view(
                    state,
                    locale,
                    data_dir,
                    is_ai_enabled(settings_state, offline_mode),
                )
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Templates(tab_id) => {
            if let Some(state) = template_editors.get(tab_id) {
                template_editor::view(state, locale)
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Scripts(tab_id) => {
            if let Some(state) = script_editors.get(tab_id) {
                script_editor::view(state, locale)
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Import(tab_id) => {
            if let Some(state) = import_editors.get(tab_id) {
                crate::views::import_editor::view(state, locale)
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Chat(tab_id) => {
            if let Some(state) = chat_editors.get(tab_id) {
                chat_view::view(state, locale, is_ai_enabled(settings_state, offline_mode))
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Tags => {
            if let Some(state) = tags_view_state {
                tags_view::view(state, locale)
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Settings => {
            if let Some(state) = settings_state {
                settings_view::view(state, locale)
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::SiteValidation => site_validation::view(site_validation_state, locale),
        ContentRoute::FindDuplicates => duplicates::view(duplicates_state, locale),
        ContentRoute::Documentation => documentation::view(guide_documentation, locale),
        ContentRoute::ApiDocumentation => documentation::view(api_documentation, locale),
        ContentRoute::MetadataDiff => metadata_diff::view(metadata_diff_state, locale),
        ContentRoute::MenuEditor => menu_editor::view(menu_editor_state, locale),
        ContentRoute::TranslationValidation => {
            translation_validation::view(translation_validation_state, locale)
        }
        ContentRoute::GitDiff(tab_id) => {
            if let Some(state) = git_diffs.get(tab_id) {
                let settings = settings_state.cloned().unwrap_or_default();
                git::diff_view(
                    state,
                    &settings.diff_view_style,
                    settings.wrap_long_lines,
                    locale,
                )
            } else {
                loading_view(locale)
            }
        }
        ContentRoute::Placeholder(title) => welcome::tab_placeholder(locale, title, None),
    }
}

#[derive(Debug, Clone, Copy)]
enum ContentRoute<'a> {
    Dashboard(&'a DashboardState),
    Welcome,
    Loading,
    Post(&'a str),
    Media(&'a str),
    Templates(&'a str),
    Scripts(&'a str),
    Import(&'a str),
    Chat(&'a str),
    Tags,
    Settings,
    SiteValidation,
    FindDuplicates,
    Documentation,
    ApiDocumentation,
    MetadataDiff,
    MenuEditor,
    TranslationValidation,
    GitDiff(&'a str),
    Placeholder(&'a str),
}

#[expect(
    clippy::too_many_arguments,
    reason = "route selection checks independent loaded-state collections"
)]
fn route_kind<'a>(
    tabs: &'a [Tab],
    active_tab: Option<&'a str>,
    post_editors: &'a HashMap<String, PostEditorState>,
    media_editors: &'a HashMap<String, MediaEditorState>,
    template_editors: &'a HashMap<String, TemplateEditorState>,
    script_editors: &'a HashMap<String, ScriptEditorState>,
    import_editors: &'a HashMap<String, crate::views::import_editor::ImportEditorState>,
    tags_view_state: Option<&'a TagsViewState>,
    settings_state: Option<&'a SettingsViewState>,
    dashboard_state: Option<&'a DashboardState>,
    _site_validation_state: &'a SiteValidationState,
) -> ContentRoute<'a> {
    let Some(tab_id) = active_tab else {
        return dashboard_state
            .map(ContentRoute::Dashboard)
            .unwrap_or(ContentRoute::Welcome);
    };
    let Some(tab) = tabs.iter().find(|t| t.id == tab_id) else {
        return dashboard_state
            .map(ContentRoute::Dashboard)
            .unwrap_or(ContentRoute::Welcome);
    };

    match tab.tab_type {
        TabType::Post => {
            if post_editors.contains_key(tab_id) {
                ContentRoute::Post(tab_id)
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Media => {
            if media_editors.contains_key(tab_id) {
                ContentRoute::Media(tab_id)
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Templates => {
            if template_editors.contains_key(tab_id) {
                ContentRoute::Templates(tab_id)
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Scripts => {
            if script_editors.contains_key(tab_id) {
                ContentRoute::Scripts(tab_id)
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Import => {
            if import_editors.contains_key(tab_id) {
                ContentRoute::Import(tab_id)
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Chat => ContentRoute::Chat(tab_id),
        TabType::Tags => {
            if tags_view_state.is_some() {
                ContentRoute::Tags
            } else {
                ContentRoute::Loading
            }
        }
        TabType::Settings => {
            if settings_state.is_some() {
                ContentRoute::Settings
            } else {
                ContentRoute::Loading
            }
        }
        TabType::SiteValidation => ContentRoute::SiteValidation,
        TabType::MetadataDiff => ContentRoute::MetadataDiff,
        TabType::GitDiff => ContentRoute::GitDiff(tab_id),
        TabType::FindDuplicates => ContentRoute::FindDuplicates,
        TabType::Documentation => ContentRoute::Documentation,
        TabType::ApiDocumentation => ContentRoute::ApiDocumentation,
        TabType::MenuEditor => ContentRoute::MenuEditor,
        TabType::Style => ContentRoute::Placeholder(&tab.title),
        TabType::TranslationValidation => ContentRoute::TranslationValidation,
    }
}

fn is_ai_enabled(settings_state: Option<&SettingsViewState>, offline_mode: bool) -> bool {
    let Some(state) = settings_state else {
        return false;
    };

    if offline_mode {
        !state.airplane_endpoint_url.trim().is_empty()
            && !state.airplane_endpoint_model.trim().is_empty()
    } else {
        !state.online_endpoint_url.trim().is_empty()
            && !state.online_endpoint_model.trim().is_empty()
            && (state.online_api_key_configured || !state.online_api_key_input.trim().is_empty())
    }
}

fn loading_view<'a>(locale: UiLocale) -> Element<'a, Message> {
    use crate::i18n::t;
    container(
        text(t(locale, "tabBar.loading"))
            .size(14)
            .color(Color::from_rgb(0.5, 0.5, 0.5)),
    )
    .width(Length::Fill)
    .height(Length::Fill)
    .center_x(Length::Fill)
    .center_y(Length::Fill)
    .into()
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::state::tabs::{Tab, TabType};

    fn tab(id: &str, tab_type: TabType, title: &str) -> Tab {
        Tab {
            id: id.to_string(),
            tab_type,
            title: title.to_string(),
            is_transient: false,
            is_dirty: false,
        }
    }

    #[test]
    fn unsupported_tool_tabs_do_not_fall_back_to_welcome_route() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();
        let unsupported = [TabType::Style];

        for tab_type in unsupported {
            let tabs = vec![tab("tool", tab_type.clone(), "Tool")];
            let route = route_kind(
                &tabs,
                Some("tool"),
                &empty_posts,
                &empty_media,
                &empty_templates,
                &empty_scripts,
                &empty_imports,
                None,
                None,
                None,
                &site_validation_state,
            );
            match route {
                ContentRoute::Placeholder(title) => assert_eq!(title, "Tool"),
                _ => panic!("expected placeholder route for {tab_type:?}"),
            }
        }
    }

    #[test]
    fn menu_editor_tab_routes_to_real_editor() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation = SiteValidationState::default();
        let tabs = vec![tab("menu", TabType::MenuEditor, "Menu")];
        let route = route_kind(
            &tabs,
            Some("menu"),
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            None,
            &site_validation,
        );
        assert!(matches!(route, ContentRoute::MenuEditor));
    }

    #[test]
    fn documentation_tabs_route_to_real_read_only_views() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation = SiteValidationState::default();
        for (tab_type, expected_api) in [
            (TabType::Documentation, false),
            (TabType::ApiDocumentation, true),
        ] {
            let tabs = vec![tab("docs", tab_type, "Docs")];
            let route = route_kind(
                &tabs,
                Some("docs"),
                &empty_posts,
                &empty_media,
                &empty_templates,
                &empty_scripts,
                &empty_imports,
                None,
                None,
                None,
                &site_validation,
            );
            assert!(matches!(
                (route, expected_api),
                (ContentRoute::Documentation, false) | (ContentRoute::ApiDocumentation, true)
            ));
        }
    }

    #[test]
    fn duplicate_tab_routes_to_real_review_surface() {
        let tabs = vec![tab(
            "find_duplicates",
            TabType::FindDuplicates,
            "Duplicates",
        )];
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation = SiteValidationState::default();
        let route = route_kind(
            &tabs,
            Some("find_duplicates"),
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            None,
            &site_validation,
        );
        assert!(matches!(route, ContentRoute::FindDuplicates));
    }

    #[test]
    fn git_diff_tab_routes_to_real_view() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();
        let tabs = vec![tab("git-diff:file.txt", TabType::GitDiff, "file.txt")];
        let route = route_kind(
            &tabs,
            Some("git-diff:file.txt"),
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            None,
            &site_validation_state,
        );
        assert!(matches!(route, ContentRoute::GitDiff("git-diff:file.txt")));
    }

    #[test]
    fn chat_tab_routes_to_real_chat_view() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();
        let tabs = vec![tab("conversation", TabType::Chat, "Chat")];
        let route = route_kind(
            &tabs,
            Some("conversation"),
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            None,
            &site_validation_state,
        );
        assert!(matches!(route, ContentRoute::Chat("conversation")));
    }

    #[test]
    fn validation_tabs_route_to_real_views() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();

        for (tab_type, expected) in [
            (TabType::MetadataDiff, "metadata diff"),
            (TabType::TranslationValidation, "translation validation"),
        ] {
            let tabs = vec![tab("tool", tab_type, "Tool")];
            let route = route_kind(
                &tabs,
                Some("tool"),
                &empty_posts,
                &empty_media,
                &empty_templates,
                &empty_scripts,
                &empty_imports,
                None,
                None,
                None,
                &site_validation_state,
            );

            let matches_expected = matches!(
                (route, expected),
                (ContentRoute::MetadataDiff, "metadata diff")
                    | (
                        ContentRoute::TranslationValidation,
                        "translation validation"
                    )
            );
            assert!(matches_expected, "expected {expected} route");
        }
    }

    #[test]
    fn dashboard_is_used_when_available_and_no_tab_is_active() {
        let dashboard = DashboardState::new("Test Project".to_string());
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();
        let route = route_kind(
            &[],
            None,
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            Some(&dashboard),
            &site_validation_state,
        );
        match route {
            ContentRoute::Dashboard(state) => assert_eq!(state.subtitle, "Test Project"),
            _ => panic!("expected dashboard route"),
        }
    }

    #[test]
    fn site_validation_tab_routes_to_real_view() {
        let empty_posts = HashMap::new();
        let empty_media = HashMap::new();
        let empty_templates = HashMap::new();
        let empty_scripts = HashMap::new();
        let empty_imports = HashMap::new();
        let site_validation_state = SiteValidationState::default();
        let tabs = vec![tab(
            "site_validation",
            TabType::SiteValidation,
            "Validation",
        )];

        let route = route_kind(
            &tabs,
            Some("site_validation"),
            &empty_posts,
            &empty_media,
            &empty_templates,
            &empty_scripts,
            &empty_imports,
            None,
            None,
            None,
            &site_validation_state,
        );

        match route {
            ContentRoute::SiteValidation => {}
            _ => panic!("expected site validation route"),
        }
    }

    #[test]
    fn ai_actions_require_configured_endpoint_for_current_mode() {
        let mut settings = SettingsViewState::default();
        assert!(!is_ai_enabled(Some(&settings), false));
        assert!(!is_ai_enabled(Some(&settings), true));

        settings.online_endpoint_url = "https://api.example.com/v1".to_string();
        settings.online_endpoint_model = "gpt-4.1-mini".to_string();
        settings.online_api_key_configured = true;
        assert!(is_ai_enabled(Some(&settings), false));
        assert!(!is_ai_enabled(Some(&settings), true));

        settings.airplane_endpoint_url = "http://localhost:11434/v1".to_string();
        settings.airplane_endpoint_model = "llama3.2".to_string();
        assert!(is_ai_enabled(Some(&settings), true));
    }
}