// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.1 OR LicenseRef-Slint-commercial

//! Data structures common between LSP and previewer

use i_slint_compiler::pathutils::to_url;

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

pub type Error = Box<dyn std::error::Error>;
pub type Result<T> = std::result::Result<T, Error>;

#[derive(Default, Clone, PartialEq, Debug, serde::Deserialize, serde::Serialize)]
pub struct PreviewConfig {
    pub hide_ui: Option<bool>,
    pub style: String,
    pub include_paths: Vec<PathBuf>,
    pub library_paths: HashMap<String, PathBuf>,
}

/// API used by the LSP to talk to the Preview. The other direction uses the
/// ServerNotifier
pub trait PreviewApi {
    fn set_use_external_previewer(&self, use_external: bool);
    fn set_contents(&self, path: &Path, contents: &str);
    fn load_preview(&self, component: PreviewComponent);
    fn config_changed(&self, config: PreviewConfig);
    fn highlight(&self, path: Option<PathBuf>, offset: u32) -> Result<()>;

    /// What is the current component to preview?
    fn current_component(&self) -> Option<PreviewComponent>;
}

/// The Component to preview
#[allow(unused)]
#[derive(Default, Clone, Debug)]
pub struct PreviewComponent {
    /// The file name to preview
    pub path: PathBuf,
    /// The name of the component within that file.
    /// If None, then the last component is going to be shown.
    pub component: Option<String>,

    /// The style name for the preview
    pub style: String,
}

#[allow(unused)]
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
pub enum LspToPreviewMessage {
    SetContents { path: String, contents: String },
    SetConfiguration { config: PreviewConfig },
    ShowPreview { path: String, component: Option<String>, style: String },
    HighlightFromEditor { path: Option<String>, offset: u32 },
}

#[allow(unused)]
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
pub struct Diagnostic {
    pub message: String,
    pub file: Option<String>,
    pub line: usize,
    pub column: usize,
    pub level: String,
}

#[allow(unused)]
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
pub enum PreviewToLspMessage {
    Status { message: String, health: crate::lsp_ext::Health },
    Diagnostics { uri: lsp_types::Url, diagnostics: Vec<lsp_types::Diagnostic> },
    ShowDocument { file: String, selection: lsp_types::Range },
    PreviewTypeChanged { is_external: bool },
    RequestState { unused: bool }, // send all documents!
}

/// Information on the Element types available
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
pub struct ComponentInformation {
    /// The name of the type
    pub name: String,
    /// A broad category to group types by
    pub category: String,
    /// This type is a global component
    pub is_global: bool,
    /// This type is built into Slint
    pub is_builtin: bool,
    /// This type is a standard widget
    pub is_std_widget: bool,
    /// This type was exported
    pub is_exported: bool,
    /// The URL to the file containing this type
    pub file: Option<String>,
    /// The offset in the file (if one is set)
    pub offset: u32,
}

impl ComponentInformation {
    pub fn import_file_name(&self, current_uri: &lsp_types::Url) -> Option<String> {
        if self.is_std_widget {
            Some("std-widgets.slint".to_string())
        } else {
            let file = self.file.clone()?;
            let url = to_url(&file)?;
            lsp_types::Url::make_relative(current_uri, &url)
        }
    }
}