// Copyright 2021 The Dawn & Tint Authors
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// 1. Redistributions of source code must retain the above copyright notice, this
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#include "src/tint/lang/wgsl/ast/module.h"

#include <utility>

#include "src/tint/lang/wgsl/ast/builder.h"
#include "src/tint/lang/wgsl/ast/clone_context.h"
#include "src/tint/lang/wgsl/ast/type_decl.h"
#include "src/tint/utils/rtti/switch.h"

TINT_INSTANTIATE_TYPEINFO(tint::ast::Module);

namespace tint::ast {

Module::Module(GenerationID pid, NodeID nid, const Source& src) : Base(pid, nid, src) {}

Module::Module(GenerationID pid, NodeID nid, const Source& src, VectorRef<const Node*> global_decls)
    : Base(pid, nid, src), global_declarations_(std::move(global_decls)) {
    for (auto* decl : global_declarations_) {
        if (decl == nullptr) {
            continue;
        }
        BinGlobalDeclaration(decl);
    }
}

Module::~Module() = default;

const TypeDecl* Module::LookupType(Symbol name) const {
    for (auto* ty : TypeDecls()) {
        if (ty->name->symbol == name) {
            return ty;
        }
    }
    return nullptr;
}

void Module::AddGlobalDeclaration(const tint::ast::Node* decl) {
    BinGlobalDeclaration(decl);
    global_declarations_.Push(decl);
}

void Module::BinGlobalDeclaration(const tint::ast::Node* decl) {
    Switch(
        decl,  //
        [&](const TypeDecl* type) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(type, generation_id);
            type_decls_.Push(type);
        },
        [&](const Function* func) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(func, generation_id);
            functions_.Push(func);
        },
        [&](const Variable* var) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(var, generation_id);
            global_variables_.Push(var);
        },
        [&](const DiagnosticDirective* diagnostic) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(diagnostic, generation_id);
            diagnostic_directives_.Push(diagnostic);
        },
        [&](const Enable* enable) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(enable, generation_id);
            enables_.Push(enable);
        },
        [&](const ast::Requires* req) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(req, generation_id);
            requires_.Push(req);
        },
        [&](const ConstAssert* assertion) {
            TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(assertion, generation_id);
            const_asserts_.Push(assertion);
        },  //
        TINT_ICE_ON_NO_MATCH);
}

void Module::AddDiagnosticDirective(const DiagnosticDirective* directive) {
    TINT_ASSERT(directive);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(directive, generation_id);
    global_declarations_.Push(directive);
    diagnostic_directives_.Push(directive);
}

void Module::AddEnable(const Enable* enable) {
    TINT_ASSERT(enable);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(enable, generation_id);
    global_declarations_.Push(enable);
    enables_.Push(enable);
}

void Module::AddRequires(const ast::Requires* req) {
    TINT_ASSERT(req);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(req, generation_id);
    global_declarations_.Push(req);
    requires_.Push(req);
}

void Module::AddGlobalVariable(const Variable* var) {
    TINT_ASSERT(var);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(var, generation_id);
    global_variables_.Push(var);
    global_declarations_.Push(var);
}

void Module::AddConstAssert(const ConstAssert* assertion) {
    TINT_ASSERT(assertion);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(assertion, generation_id);
    const_asserts_.Push(assertion);
    global_declarations_.Push(assertion);
}

void Module::AddTypeDecl(const TypeDecl* type) {
    TINT_ASSERT(type);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(type, generation_id);
    type_decls_.Push(type);
    global_declarations_.Push(type);
}

void Module::AddFunction(const Function* func) {
    TINT_ASSERT(func);
    TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(func, generation_id);
    functions_.Push(func);
    global_declarations_.Push(func);
}

bool Module::HasOverrides() const {
    for (auto* var : global_variables_) {
        if (var->As<ast::Override>()) {
            return true;
        }
    }
    return false;
}

const Module* Module::Clone(CloneContext& ctx) const {
    auto* out = ctx.dst->create<Module>();
    out->Copy(ctx, this);
    return out;
}

void Module::Copy(CloneContext& ctx, const Module* src) {
    ctx.Clone(global_declarations_, src->global_declarations_);

    // During the clone, declarations may have been placed into the module.
    // Clear everything out, as we're about to re-bin the declarations.
    type_decls_.Clear();
    functions_.Clear();
    global_variables_.Clear();
    enables_.Clear();
    diagnostic_directives_.Clear();

    for (auto* decl : global_declarations_) {
        if (TINT_UNLIKELY(!decl)) {
            TINT_ICE() << "src global declaration was nullptr";
            continue;
        }
        BinGlobalDeclaration(decl);
    }
}

}  // namespace tint::ast