use adw::prelude::*;
use pixstrip_core::preset::Preset;
use pixstrip_core::operations::*;
use crate::app::{AppState, JobConfig, MetadataMode};

pub fn build_workflow_page(state: &AppState) -> adw::NavigationPage {
    let scrolled = gtk::ScrolledWindow::builder()
        .hscrollbar_policy(gtk::PolicyType::Never)
        .vexpand(true)
        .build();

    let content = gtk::Box::builder()
        .orientation(gtk::Orientation::Vertical)
        .spacing(12)
        .margin_top(12)
        .margin_bottom(12)
        .margin_start(24)
        .margin_end(24)
        .build();

    // Built-in presets section
    let builtin_group = adw::PreferencesGroup::builder()
        .title("Built-in Workflows")
        .description("Select a preset to get started quickly")
        .build();

    let builtin_flow = gtk::FlowBox::builder()
        .selection_mode(gtk::SelectionMode::Single)
        .max_children_per_line(4)
        .min_children_per_line(2)
        .row_spacing(8)
        .column_spacing(8)
        .homogeneous(true)
        .build();

    let builtins = Preset::all_builtins();
    for preset in &builtins {
        let card = build_preset_card(preset);
        builtin_flow.append(&card);
    }

    // When a preset card is activated, apply it to JobConfig and advance
    {
        let jc = state.job_config.clone();
        builtin_flow.connect_child_activated(move |flow, child| {
            let idx = child.index() as usize;
            if let Some(preset) = builtins.get(idx) {
                apply_preset_to_config(&mut jc.borrow_mut(), preset);
            }
            flow.activate_action("win.next-step", None).ok();
        });
    }

    builtin_group.add(&builtin_flow);
    content.append(&builtin_group);

    // Custom workflow section
    let custom_group = adw::PreferencesGroup::builder()
        .title("Custom Workflow")
        .description("Choose which operations to include, then click Next")
        .build();

    let resize_check = adw::SwitchRow::builder()
        .title("Resize")
        .subtitle("Scale images to new dimensions")
        .active(state.job_config.borrow().resize_enabled)
        .build();

    let adjustments_check = adw::SwitchRow::builder()
        .title("Adjustments")
        .subtitle("Rotate, flip, brightness, contrast, effects")
        .active(state.job_config.borrow().adjustments_enabled)
        .build();

    let convert_check = adw::SwitchRow::builder()
        .title("Convert")
        .subtitle("Change image format (JPEG, PNG, WebP, AVIF)")
        .active(state.job_config.borrow().convert_enabled)
        .build();

    let compress_check = adw::SwitchRow::builder()
        .title("Compress")
        .subtitle("Reduce file size with quality control")
        .active(state.job_config.borrow().compress_enabled)
        .build();

    let metadata_check = adw::SwitchRow::builder()
        .title("Metadata")
        .subtitle("Strip or modify EXIF, GPS, camera data")
        .active(state.job_config.borrow().metadata_enabled)
        .build();

    let watermark_check = adw::SwitchRow::builder()
        .title("Watermark")
        .subtitle("Add text or image overlay")
        .active(state.job_config.borrow().watermark_enabled)
        .build();

    let rename_check = adw::SwitchRow::builder()
        .title("Rename")
        .subtitle("Rename files with prefix, suffix, or template")
        .active(state.job_config.borrow().rename_enabled)
        .build();

    custom_group.add(&resize_check);
    custom_group.add(&adjustments_check);
    custom_group.add(&convert_check);
    custom_group.add(&compress_check);
    custom_group.add(&metadata_check);
    custom_group.add(&watermark_check);
    custom_group.add(&rename_check);

    // Wire custom operation toggles to job config
    {
        let jc = state.job_config.clone();
        resize_check.connect_active_notify(move |row| {
            jc.borrow_mut().resize_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        adjustments_check.connect_active_notify(move |row| {
            jc.borrow_mut().adjustments_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        convert_check.connect_active_notify(move |row| {
            jc.borrow_mut().convert_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        compress_check.connect_active_notify(move |row| {
            jc.borrow_mut().compress_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        metadata_check.connect_active_notify(move |row| {
            jc.borrow_mut().metadata_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        watermark_check.connect_active_notify(move |row| {
            jc.borrow_mut().watermark_enabled = row.is_active();
        });
    }
    {
        let jc = state.job_config.clone();
        rename_check.connect_active_notify(move |row| {
            jc.borrow_mut().rename_enabled = row.is_active();
        });
    }

    content.append(&custom_group);

    // User presets section
    let user_group = adw::PreferencesGroup::builder()
        .title("Your Presets")
        .description("Import or save your own workflows")
        .build();

    // Show saved user presets
    let store = pixstrip_core::storage::PresetStore::new();
    if let Ok(presets) = store.list() {
        for preset in &presets {
            if !preset.is_custom {
                continue;
            }
            let row = adw::ActionRow::builder()
                .title(&preset.name)
                .subtitle(&preset.description)
                .activatable(true)
                .build();
            row.add_prefix(&gtk::Image::from_icon_name(&preset.icon));

            // Export button
            let export_btn = gtk::Button::builder()
                .icon_name("document-save-as-symbolic")
                .tooltip_text("Export preset")
                .valign(gtk::Align::Center)
                .build();
            export_btn.add_css_class("flat");
            let preset_for_export = preset.clone();
            export_btn.connect_clicked(move |btn| {
                let p = preset_for_export.clone();
                let dialog = gtk::FileDialog::builder()
                    .title("Export Preset")
                    .initial_name(&format!("{}.pixstrip-preset", p.name))
                    .modal(true)
                    .build();
                if let Some(window) = btn.root().and_then(|r| r.downcast::<gtk::Window>().ok()) {
                    dialog.save(Some(&window), gtk::gio::Cancellable::NONE, move |result| {
                        if let Ok(file) = result
                            && let Some(path) = file.path()
                        {
                            let store = pixstrip_core::storage::PresetStore::new();
                            let _ = store.export_to_file(&p, &path);
                        }
                    });
                }
            });
            row.add_suffix(&export_btn);

            // Delete button
            let delete_btn = gtk::Button::builder()
                .icon_name("user-trash-symbolic")
                .tooltip_text("Delete preset")
                .valign(gtk::Align::Center)
                .build();
            delete_btn.add_css_class("flat");
            delete_btn.add_css_class("error");
            let pname = preset.name.clone();
            let row_ref = row.clone();
            let group_ref = user_group.clone();
            delete_btn.connect_clicked(move |_| {
                let store = pixstrip_core::storage::PresetStore::new();
                let _ = store.delete(&pname);
                group_ref.remove(&row_ref);
            });
            row.add_suffix(&delete_btn);

            row.add_suffix(&gtk::Image::from_icon_name("go-next-symbolic"));

            let jc = state.job_config.clone();
            let p = preset.clone();
            row.connect_activated(move |r| {
                apply_preset_to_config(&mut jc.borrow_mut(), &p);
                r.activate_action("win.next-step", None).ok();
            });

            user_group.add(&row);
        }
    }

    let import_button = gtk::Button::builder()
        .label("Import Preset")
        .icon_name("document-open-symbolic")
        .action_name("win.import-preset")
        .build();
    import_button.add_css_class("flat");
    user_group.add(&import_button);
    content.append(&user_group);

    scrolled.set_child(Some(&content));

    let clamp = adw::Clamp::builder()
        .maximum_size(800)
        .child(&scrolled)
        .build();

    // Drop target for .pixstrip-preset files
    let drop_target = gtk::DropTarget::new(gtk::gio::File::static_type(), gtk::gdk::DragAction::COPY);
    let jc_drop = state.job_config.clone();
    drop_target.connect_drop(move |_target, value, _x, _y| {
        if let Ok(file) = value.get::<gtk::gio::File>() {
            if let Some(path) = file.path() {
                if path.extension().and_then(|e| e.to_str()) == Some("pixstrip-preset") {
                    let store = pixstrip_core::storage::PresetStore::new();
                    if let Ok(preset) = store.import_from_file(&path) {
                        apply_preset_to_config(&mut jc_drop.borrow_mut(), &preset);
                        let _ = store.save(&preset);
                        return true;
                    }
                }
            }
        }
        false
    });
    clamp.add_controller(drop_target);

    adw::NavigationPage::builder()
        .title("Choose a Workflow")
        .tag("step-workflow")
        .child(&clamp)
        .build()
}

fn apply_preset_to_config(cfg: &mut JobConfig, preset: &Preset) {
    // Resize
    match &preset.resize {
        Some(ResizeConfig::ByWidth(w)) => {
            cfg.resize_enabled = true;
            cfg.resize_width = *w;
            cfg.resize_height = 0;
            cfg.allow_upscale = false;
        }
        Some(ResizeConfig::ByHeight(h)) => {
            cfg.resize_enabled = true;
            cfg.resize_width = 0;
            cfg.resize_height = *h;
            cfg.allow_upscale = false;
        }
        Some(ResizeConfig::FitInBox { max, allow_upscale }) => {
            cfg.resize_enabled = true;
            cfg.resize_width = max.width;
            cfg.resize_height = max.height;
            cfg.allow_upscale = *allow_upscale;
        }
        Some(ResizeConfig::Exact(dims)) => {
            cfg.resize_enabled = true;
            cfg.resize_width = dims.width;
            cfg.resize_height = dims.height;
            cfg.allow_upscale = true;
        }
        None => {
            cfg.resize_enabled = false;
        }
    }

    // Convert
    match &preset.convert {
        Some(ConvertConfig::SingleFormat(fmt)) => {
            cfg.convert_enabled = true;
            cfg.convert_format = Some(*fmt);
        }
        Some(_) => {
            cfg.convert_enabled = true;
            cfg.convert_format = None;
        }
        None => {
            cfg.convert_enabled = false;
            cfg.convert_format = None;
        }
    }

    // Compress
    match &preset.compress {
        Some(CompressConfig::Preset(q)) => {
            cfg.compress_enabled = true;
            cfg.quality_preset = *q;
        }
        Some(CompressConfig::Custom { jpeg_quality, png_level, webp_quality, .. }) => {
            cfg.compress_enabled = true;
            if let Some(jq) = jpeg_quality {
                cfg.jpeg_quality = *jq;
            }
            if let Some(pl) = png_level {
                cfg.png_level = *pl;
            }
            if let Some(wq) = webp_quality {
                cfg.webp_quality = *wq as u8;
            }
        }
        None => {
            cfg.compress_enabled = false;
        }
    }

    // Metadata
    match &preset.metadata {
        Some(MetadataConfig::StripAll) => {
            cfg.metadata_enabled = true;
            cfg.metadata_mode = MetadataMode::StripAll;
        }
        Some(MetadataConfig::Privacy) => {
            cfg.metadata_enabled = true;
            cfg.metadata_mode = MetadataMode::Privacy;
        }
        Some(MetadataConfig::KeepAll) => {
            cfg.metadata_enabled = true;
            cfg.metadata_mode = MetadataMode::KeepAll;
        }
        Some(MetadataConfig::Custom { strip_gps, strip_camera, strip_software, strip_timestamps, strip_copyright }) => {
            cfg.metadata_enabled = true;
            cfg.metadata_mode = MetadataMode::Custom;
            cfg.strip_gps = *strip_gps;
            cfg.strip_camera = *strip_camera;
            cfg.strip_software = *strip_software;
            cfg.strip_timestamps = *strip_timestamps;
            cfg.strip_copyright = *strip_copyright;
        }
        None => {
            cfg.metadata_enabled = false;
        }
    }
}

fn build_preset_card(preset: &Preset) -> gtk::Box {
    let card = gtk::Box::builder()
        .orientation(gtk::Orientation::Vertical)
        .spacing(8)
        .halign(gtk::Align::Center)
        .valign(gtk::Align::Start)
        .build();
    card.add_css_class("card");
    card.set_size_request(180, 120);

    let inner = gtk::Box::builder()
        .orientation(gtk::Orientation::Vertical)
        .spacing(4)
        .margin_top(16)
        .margin_bottom(16)
        .margin_start(12)
        .margin_end(12)
        .halign(gtk::Align::Center)
        .valign(gtk::Align::Center)
        .vexpand(true)
        .build();

    let icon = gtk::Image::builder()
        .icon_name(&preset.icon)
        .pixel_size(32)
        .build();

    let name_label = gtk::Label::builder()
        .label(&preset.name)
        .css_classes(["heading"])
        .build();

    let desc_label = gtk::Label::builder()
        .label(&preset.description)
        .css_classes(["caption", "dim-label"])
        .wrap(true)
        .justify(gtk::Justification::Center)
        .max_width_chars(20)
        .build();

    inner.append(&icon);
    inner.append(&name_label);
    inner.append(&desc_label);
    card.append(&inner);

    card
}