// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_IR_BUILDER_H_
#define SRC_TINT_IR_BUILDER_H_

#include <utility>

#include "src/tint/constant/scalar.h"
#include "src/tint/ir/binary.h"
#include "src/tint/ir/bitcast.h"
#include "src/tint/ir/block_param.h"
#include "src/tint/ir/builtin.h"
#include "src/tint/ir/constant.h"
#include "src/tint/ir/construct.h"
#include "src/tint/ir/convert.h"
#include "src/tint/ir/discard.h"
#include "src/tint/ir/function.h"
#include "src/tint/ir/function_param.h"
#include "src/tint/ir/function_terminator.h"
#include "src/tint/ir/if.h"
#include "src/tint/ir/load.h"
#include "src/tint/ir/loop.h"
#include "src/tint/ir/module.h"
#include "src/tint/ir/root_terminator.h"
#include "src/tint/ir/store.h"
#include "src/tint/ir/switch.h"
#include "src/tint/ir/unary.h"
#include "src/tint/ir/user_call.h"
#include "src/tint/ir/value.h"
#include "src/tint/ir/var.h"
#include "src/tint/type/bool.h"
#include "src/tint/type/f16.h"
#include "src/tint/type/f32.h"
#include "src/tint/type/i32.h"
#include "src/tint/type/u32.h"
#include "src/tint/type/void.h"

namespace tint::ir {

/// Builds an ir::Module
class Builder {
  public:
    /// Constructor
    /// @param mod the ir::Module to wrap with this builder
    explicit Builder(Module& mod);
    /// Destructor
    ~Builder();

    /// @returns a new block flow node
    Block* CreateBlock();

    /// @returns a new root terminator flow node
    RootTerminator* CreateRootTerminator();

    /// @returns a new function terminator flow node
    FunctionTerminator* CreateFunctionTerminator();

    /// Creates a function flow node
    /// @param name the function name
    /// @param return_type the function return type
    /// @param stage the function stage
    /// @param wg_size the workgroup_size
    /// @returns the flow node
    Function* CreateFunction(Symbol name,
                             type::Type* return_type,
                             Function::PipelineStage stage = Function::PipelineStage::kUndefined,
                             std::optional<std::array<uint32_t, 3>> wg_size = {});

    /// Creates an if flow node
    /// @param condition the if condition
    /// @returns the flow node
    If* CreateIf(Value* condition);

    /// Creates a loop flow node
    /// @returns the flow node
    Loop* CreateLoop();

    /// Creates a switch flow node
    /// @param condition the switch condition
    /// @returns the flow node
    Switch* CreateSwitch(Value* condition);

    /// Creates a case flow node for the given case branch.
    /// @param s the switch to create the case into
    /// @param selectors the case selectors for the case statement
    /// @returns the start block for the case flow node
    Block* CreateCase(Switch* s, utils::VectorRef<Switch::CaseSelector> selectors);

    /// Creates a constant::Value
    /// @param args the arguments
    /// @returns the new constant value
    template <typename T, typename... ARGS>
    utils::traits::EnableIf<utils::traits::IsTypeOrDerived<T, constant::Value>, const T>* create(
        ARGS&&... args) {
        return ir.constants_arena.Create<T>(std::forward<ARGS>(args)...);
    }

    /// Creates a new ir::Constant
    /// @param val the constant value
    /// @returns the new constant
    ir::Constant* Constant(const constant::Value* val) {
        return ir.constants.GetOrCreate(val, [&]() { return ir.values.Create<ir::Constant>(val); });
    }

    /// Creates a ir::Constant for an i32 Scalar
    /// @param v the value
    /// @returns the new constant
    ir::Constant* Constant(i32 v) {
        return Constant(create<constant::Scalar<i32>>(ir.types.Get<type::I32>(), v));
    }

    /// Creates a ir::Constant for a u32 Scalar
    /// @param v the value
    /// @returns the new constant
    ir::Constant* Constant(u32 v) {
        return Constant(create<constant::Scalar<u32>>(ir.types.Get<type::U32>(), v));
    }

    /// Creates a ir::Constant for a f32 Scalar
    /// @param v the value
    /// @returns the new constant
    ir::Constant* Constant(f32 v) {
        return Constant(create<constant::Scalar<f32>>(ir.types.Get<type::F32>(), v));
    }

    /// Creates a ir::Constant for a f16 Scalar
    /// @param v the value
    /// @returns the new constant
    ir::Constant* Constant(f16 v) {
        return Constant(create<constant::Scalar<f16>>(ir.types.Get<type::F16>(), v));
    }

    /// Creates a ir::Constant for a bool Scalar
    /// @param v the value
    /// @returns the new constant
    ir::Constant* Constant(bool v) {
        return Constant(create<constant::Scalar<bool>>(ir.types.Get<type::Bool>(), v));
    }

    /// Creates an op for `lhs kind rhs`
    /// @param kind the kind of operation
    /// @param type the result type of the binary expression
    /// @param lhs the left-hand-side of the operation
    /// @param rhs the right-hand-side of the operation
    /// @returns the operation
    Binary* CreateBinary(enum Binary::Kind kind, const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an And operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* And(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Or operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Or(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Xor operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Xor(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Equal operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Equal(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an NotEqual operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* NotEqual(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an LessThan operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* LessThan(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an GreaterThan operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* GreaterThan(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an LessThanEqual operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* LessThanEqual(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an GreaterThanEqual operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* GreaterThanEqual(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an ShiftLeft operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* ShiftLeft(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an ShiftRight operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* ShiftRight(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Add operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Add(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Subtract operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Subtract(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Multiply operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Multiply(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Divide operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Divide(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an Modulo operation
    /// @param type the result type of the expression
    /// @param lhs the lhs of the add
    /// @param rhs the rhs of the add
    /// @returns the operation
    Binary* Modulo(const type::Type* type, Value* lhs, Value* rhs);

    /// Creates an op for `kind val`
    /// @param kind the kind of operation
    /// @param type the result type of the binary expression
    /// @param val the value of the operation
    /// @returns the operation
    Unary* CreateUnary(enum Unary::Kind kind, const type::Type* type, Value* val);

    /// Creates a Complement operation
    /// @param type the result type of the expression
    /// @param val the value
    /// @returns the operation
    Unary* Complement(const type::Type* type, Value* val);

    /// Creates a Negation operation
    /// @param type the result type of the expression
    /// @param val the value
    /// @returns the operation
    Unary* Negation(const type::Type* type, Value* val);

    /// Creates a Not operation
    /// @param type the result type of the expression
    /// @param val the value
    /// @returns the operation
    Binary* Not(const type::Type* type, Value* val);

    /// Creates a bitcast instruction
    /// @param type the result type of the bitcast
    /// @param val the value being bitcast
    /// @returns the instruction
    ir::Bitcast* Bitcast(const type::Type* type, Value* val);

    /// Creates a discard instruction
    /// @returns the instruction
    ir::Discard* Discard();

    /// Creates a user function call instruction
    /// @param type the return type of the call
    /// @param name the name of the function being called
    /// @param args the call arguments
    /// @returns the instruction
    ir::UserCall* UserCall(const type::Type* type, Symbol name, utils::VectorRef<Value*> args);

    /// Creates a value conversion instruction
    /// @param to the type converted to
    /// @param from the type converted from
    /// @param args the arguments to be converted
    /// @returns the instruction
    ir::Convert* Convert(const type::Type* to,
                         const type::Type* from,
                         utils::VectorRef<Value*> args);

    /// Creates a value constructor instruction
    /// @param to the type being converted
    /// @param args the arguments to be converted
    /// @returns the instruction
    ir::Construct* Construct(const type::Type* to, utils::VectorRef<Value*> args);

    /// Creates a builtin call instruction
    /// @param type the return type
    /// @param func the builtin function
    /// @param args the arguments to be converted
    /// @returns the instruction
    ir::Builtin* Builtin(const type::Type* type,
                         builtin::Function func,
                         utils::VectorRef<Value*> args);

    /// Creates a load instruction
    /// @param from the expression being loaded from
    /// @returns the instruction
    ir::Load* Load(Value* from);

    /// Creates a store instruction
    /// @param to the expression being stored too
    /// @param from the expression being stored
    /// @returns the instruction
    ir::Store* Store(Value* to, Value* from);

    /// Creates a new `var` declaration
    /// @param type the var type
    /// @returns the instruction
    ir::Var* Declare(const type::Type* type);

    /// Creates a new `BlockParam`
    /// @param type the parameter type
    /// @returns the value
    ir::BlockParam* BlockParam(const type::Type* type);

    /// Creates a new `FunctionParam`
    /// @param type the parameter type
    /// @returns the value
    ir::FunctionParam* FunctionParam(const type::Type* type);

    /// Retrieves the root block for the module, creating if necessary
    /// @returns the root block
    ir::Block* CreateRootBlockIfNeeded();

    /// The IR module.
    Module& ir;
};

}  // namespace tint::ir

#endif  // SRC_TINT_IR_BUILDER_H_