# ui.R
ui <- page_navbar(
    id = "main_nav",
    header = tagList(
        shinyjs::useShinyjs(),
        tags$head(
            tags$meta(charset = "utf-8"),
            tags$meta(`http-equiv` = "X-UA-Compatible", content = "IE=edge"),
            tags$meta(name = "viewport", content = "width=device-width, initial-scale=1"),
            # Include external CSS and JS from www/ folder
            tags$link(rel = "stylesheet", type = "text/css", href = "styles.css"),
            tags$script(src = "app.js"),
            # Layer Control Interactions
            tags$script(HTML("
                $(document).ready(function() {
                  // Layer Control Interactions
                  var $layerControl = $('.map-layer-control');

                  $layerControl.on('mouseenter', function() {
                    $(this).addClass('expanded');
                  });

                  $layerControl.on('mouseleave', function() {
                    $(this).removeClass('expanded');
                  });

                  // Auto-close when a radio button (basemap) is selected
                  $layerControl.on('change', 'input[type=\\'radio\\']', function() {
                    $layerControl.removeClass('expanded');
                  });
                });
            "))
        ),
        # Frozen overlay div
        div(
            class = "frozen-overlay",
            div(
                class = "frozen-overlay-content",
                tags$button(class = "frozen-overlay-close", "×", title = "Cancel loading"),
                p(class = "frozen-overlay-station", ""),
                div(class = "spinner-border text-primary", role = "status"),
                p(class = "frozen-overlay-message", "Loading data...")
            )
        )
    ),
    title = "JMA Explorer",
    theme = bs_theme(version = 5, bootswatch = "cosmo"),
    sidebar = sidebar(
        title = "Filters",
        # Data Resolution
        radioButtons("data_resolution", "Time Resolution", choices = c("10 Minutes", "Hourly", "Daily", "Monthly"), selected = "Daily", inline = TRUE),
        # Station Search
        selectizeInput("station_selector", "Find Station", choices = NULL, multiple = FALSE, options = list(placeholder = "Type to search...")),
        div(
            style = "display: flex; align-items: center; gap: 8px;",
            tags$label("Select Date Range"),
            tooltip(
                bsicons::bs_icon("info-circle", size = "1em"),
                "Filter stations that have data overlapping with this date range."
            )
        ),
        dateRangeInput("date_range",
            label = NULL,
            start = Sys.Date() - 366,
            end = Sys.Date(),
            min = "1872-01-01",
            max = Sys.Date(),
            format = "yyyy-mm-dd",
            separator = " to "
        ),
        hr(),
        strong(textOutput("visible_count", inline = TRUE)),
        hr(),
        p("Data source: JMA (Japan Meteorological Agency)"),
        p(style = "font-size: 0.8em; color: #666;", "Includes: 10-min, Hourly, Daily, and Monthly data"),
        hr(),
        div(
            style = "display: flex; align-items: flex-start; gap: 8px;",
            tags$small("Tip: Click map points to view detailed weather plots.")
        )
    ),
    nav_panel(
        title = "Map View",
        div(
            class = "outer",
            maplibreOutput("map", height = "100%", width = "100%"),

            # Layer Control Panel (Collapsible)
            absolutePanel(
                top = 130, left = 10,
                class = "map-layer-control",
                style = "z-index: 1000;",
                div(class = "control-icon", icon("layer-group")),
                div(
                    class = "control-content",
                    radioButtons(
                        inputId = "basemap",
                        label = "Basemap",
                        choices = c(
                            "OpenFreeMap Positron" = "ofm_positron",
                            "OpenFreeMap Bright" = "ofm_bright",
                            "Satellite (Sentinel-2)" = "sentinel"
                        ),
                        selected = "ofm_positron"
                    ),
                    hr(style = "margin: 8px 0;"),
                    checkboxInput(
                        inputId = "show_labels",
                        label = "Show Labels",
                        value = TRUE
                    )
                )
            ),

            # Home Button Overlay (matching DWD style)
            absolutePanel(
                id = "zoom_home_panel",
                top = 80, left = 10,
                actionButton("zoom_home", bsicons::bs_icon("house-fill"), class = "btn-home", title = "Zoom to all stations")
            )
        )
    ),
    nav_panel(
        title = "Station Info",
        div(
            class = "strict-table",
            style = "padding: 20px;",
            div(
                style = "margin-bottom: 10px; color: #666; display: flex; align-items: center; gap: 6px;",
                bsicons::bs_icon("info-circle"),
                "Double-click a row to load station data and view the dashboard."
            ),
            h4("Filtered Stations Metadata"),
            p("List of stations matching the current resolution and date filters."),
            DT::dataTableOutput("station_info_table")
        )
    ),
    nav_panel(
        title = "Dashboard",
        value = "Dashboard",
        # Empty State
        conditionalPanel(
            condition = "!output.station_ready",
            div(
                style = "height: 600px; display: flex; align-items: center; justify-content: center;",
                p("Select a station from the map or the dropdown to view the dashboard.", style = "color: #999; font-size: 1.2em;")
            )
        ),
        # Dashboard Content
        conditionalPanel(
            condition = "output.station_ready",
            div(
                class = "h-100 p-3",
                uiOutput("station_info_header"),
                navset_card_pill(
                    id = "dashboard_subtabs",
                    nav_panel(
                        title = "Plots",
                        div(
                            style = "padding: 0px;",
                            uiOutput("jma_plots_container")
                        )
                    ),
                    nav_panel(
                        title = "Data",
                        div(
                            style = "margin-top: 10px;",
                            DT::dataTableOutput("daily_data")
                        )
                    )
                )
            )
        )
    ),
    nav_spacer(),
    nav_item(
        tooltip(
            tags$a(
                id = "fullscreen_toggle",
                href = "#",
                onclick = "toggleFullScreen(); return false;",
                style = "display: flex; align-items: center; color: rgba(0,0,0,0.55); padding: 0.5rem 1rem; text-decoration: none;",
                bsicons::bs_icon("arrows-fullscreen", size = "1.2rem")
            ),
            "Toggle Fullscreen",
            placement = "bottom"
        )
    )
)