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#include "src/tint/lang/wgsl/ls/server.h"

#include "langsvr/lsp/primitives.h"
#include "src/tint/lang/wgsl/ast/identifier.h"
#include "src/tint/lang/wgsl/ast/identifier_expression.h"
#include "src/tint/lang/wgsl/ls/utils.h"
#include "src/tint/lang/wgsl/sem/function.h"
#include "src/tint/lang/wgsl/sem/function_expression.h"
#include "src/tint/lang/wgsl/sem/member_accessor_expression.h"
#include "src/tint/lang/wgsl/sem/struct.h"
#include "src/tint/lang/wgsl/sem/variable.h"
#include "src/tint/utils/rtti/switch.h"

namespace lsp = langsvr::lsp;

namespace tint::wgsl::ls {

typename lsp::TextDocumentPrepareRenameRequest::ResultType  //
Server::Handle(const lsp::TextDocumentPrepareRenameRequest& r) {
    typename lsp::TextDocumentPrepareRenameRequest::SuccessType result = lsp::Null{};

    auto file = files_.Get(r.text_document.uri);
    if (!file) {
        return lsp::Null{};
    }

    auto def = (*file)->Definition(Conv(r.position));
    if (!def) {
        return lsp::Null{};
    }

    lsp::PrepareRenamePlaceholder out;
    out.range = Conv(def->reference);
    out.placeholder = def->text;
    return lsp::PrepareRenameResult{out};
}

typename lsp::TextDocumentRenameRequest::ResultType  //
Server::Handle(const lsp::TextDocumentRenameRequest& r) {
    auto file = files_.Get(r.text_document.uri);
    if (!file) {
        return lsp::Null{};
    }

    if (!(*file)->Definition(Conv(r.position))) {
        return lsp::Null{};
    }

    std::vector<lsp::TextEdit> changes;
    for (auto& ref : (*file)->References(Conv(r.position), /* include_declaration */ true)) {
        lsp::TextEdit edit;
        edit.range = Conv(ref);
        edit.new_text = r.new_name;
        changes.emplace_back(std::move(edit));
    }

    if (changes.empty()) {
        return lsp::Null{};
    }
    std::unordered_map<lsp::DocumentUri, std::vector<lsp::TextEdit>> uri_changes;
    uri_changes[r.text_document.uri] = std::move(changes);

    lsp::WorkspaceEdit edit;
    edit.changes = std::move(uri_changes);
    return std::move(edit);
}

}  // namespace tint::wgsl::ls