#![feature(char_indices_offset)]
mod document;
mod compiler;
mod parser;
mod elements;
mod lua;
mod cache;
mod lsp;

use std::collections::HashMap;
use std::rc::Rc;
use std::sync::Arc;

use dashmap::DashMap;
use document::document::Document;
use document::element::Element;
use lsp::semantic::{semantic_token_from_document, LEGEND_TYPE};
use parser::langparser::LangParser;
use parser::parser::Parser;
use parser::source::SourceFile;
use tower_lsp::jsonrpc::Result;
use tower_lsp::lsp_types::*;
use tower_lsp::{Client, LanguageServer, LspService, Server};

#[derive(Debug)]
struct Backend {
    client: Client,
	document_map: DashMap<String, String>,
	//ast_map: DashMap<String, Vec<Box<dyn Element>>>,
	//variables: DashMap<String, HashMap<String, Arc<dyn Variable + Send + Sync + 'static>>>,
    semantic_token_map: DashMap<String, Vec<SemanticToken>>,
}

#[derive(Debug)]
struct TextDocumentItem {
	uri: Url,
	text: String,
}

impl Backend {
	async fn on_change(&self, params: TextDocumentItem) {
		self.document_map
			.insert(params.uri.to_string(), params.text.clone());

		// TODO: Create a custom parser for the lsp
		// Which will require a dyn Document to work
		let source = SourceFile::with_content(
			params.uri.to_string(),
			params.text.clone(),
			None);
		let parser = LangParser::default();
		let doc = parser.parse(Rc::new(source), None);
		
		//let semantic_tokens = semantic_token_from_document(&doc);
        //self.semantic_token_map
        //    .insert(params.uri.to_string(), semantic_tokens);
	}
}

#[tower_lsp::async_trait]
impl LanguageServer for Backend {
    async fn initialize(&self, _: InitializeParams) -> Result<InitializeResult> {
		Ok(InitializeResult {
			server_info: None,
			capabilities: ServerCapabilities {
				text_document_sync: Some(TextDocumentSyncCapability::Kind(
						TextDocumentSyncKind::FULL,
				)),
				completion_provider: Some(CompletionOptions {
					resolve_provider: Some(false),
					trigger_characters: Some(vec!["%".to_string()]),
					work_done_progress_options: Default::default(),
					all_commit_characters: None,
					completion_item: None,
				}),
				semantic_tokens_provider: Some(
                    SemanticTokensServerCapabilities::SemanticTokensRegistrationOptions(
                        SemanticTokensRegistrationOptions {
                            text_document_registration_options: {
                                TextDocumentRegistrationOptions {
                                    document_selector: Some(vec![DocumentFilter {
                                        language: Some("nml".to_string()),
                                        scheme: Some("file".to_string()),
                                        pattern: None,
                                    }]),
                                }
                            },
                            semantic_tokens_options: SemanticTokensOptions {
                                work_done_progress_options: WorkDoneProgressOptions::default(),
                                legend: SemanticTokensLegend {
                                    token_types: LEGEND_TYPE.into(),
                                    token_modifiers: vec![],
                                },
                                range: None, //Some(true),
                                full: Some(SemanticTokensFullOptions::Bool(true)),
                            },
                            static_registration_options: StaticRegistrationOptions::default(),
                        },
                    ),
                ),
				..ServerCapabilities::default()
			},
		})
    }

    async fn initialized(&self, _: InitializedParams) {
        self.client
            .log_message(MessageType::INFO, "server initialized!")
            .await;
    }

    async fn shutdown(&self) -> Result<()> {
        Ok(())
    }

	async fn did_open(&self, params: DidOpenTextDocumentParams) {
		self.client
			.log_message(MessageType::INFO, "file opened!")
			.await;
		self.on_change(TextDocumentItem {
			uri: params.text_document.uri,
			text: params.text_document.text,
		})
		.await
	}

	async fn did_change(&self, mut params: DidChangeTextDocumentParams) {
		self.on_change(TextDocumentItem {
			uri: params.text_document.uri,
			text: std::mem::take(&mut params.content_changes[0].text),
		})
		.await
	}

    async fn completion(&self, params: CompletionParams) -> Result<Option<CompletionResponse>> {
        let uri = params.text_document_position.text_document.uri;
        let position = params.text_document_position.position;
        let completions = || -> Option<Vec<CompletionItem>> {
            let mut ret = Vec::with_capacity(0);

            Some(ret)
        }();
        Ok(completions.map(CompletionResponse::Array))
    }

	async fn semantic_tokens_full(
		&self,
		params: SemanticTokensParams,
	) -> Result<Option<SemanticTokensResult>> {
		let uri = params.text_document.uri.to_string();
		self.client
			.log_message(MessageType::LOG, "semantic_token_full")
			.await;

		if let Some(semantic_tokens) = self.semantic_token_map.get(&uri) {
			let data = semantic_tokens.iter()
				.filter_map(|token| {
					Some(token.clone())
				})
				.collect::<Vec<_>>();

			return Ok(Some(SemanticTokensResult::Tokens(SemanticTokens {
				result_id: None,
				data: data,
			})));
		}
		Ok(None)
	}
}

#[tokio::main]
async fn main() {
    let stdin = tokio::io::stdin();
    let stdout = tokio::io::stdout();

    let (service, socket) = LspService::new(
		|client|
			Backend {
				client,
				document_map: DashMap::new(),
				semantic_token_map: DashMap::new(),
			});
    Server::new(stdin, stdout, socket).serve(service).await;
}