// Copyright 2023 PingCAP, Inc.
//
// 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.

package expression

import (
	"time"

	"github.com/pingcap/tidb/pkg/errctx"
	"github.com/pingcap/tidb/pkg/expression/context"
	"github.com/pingcap/tidb/pkg/expression/contextopt"
	"github.com/pingcap/tidb/pkg/parser/mysql"
	"github.com/pingcap/tidb/pkg/sessionctx/stmtctx"
	"github.com/pingcap/tidb/pkg/types"
	"github.com/pingcap/tidb/pkg/util/intest"
)

// EvalContext is used to evaluate an expression
type EvalContext = context.EvalContext

// BuildContext is used to build an expression
type BuildContext = context.BuildContext

// OptionalEvalPropKey is an alias of context.OptionalEvalPropKey
type OptionalEvalPropKey = context.OptionalEvalPropKey

// OptionalEvalPropProvider is an alias of context.OptionalEvalPropProvider
type OptionalEvalPropProvider = context.OptionalEvalPropProvider

// OptionalEvalPropKeySet is an alias of context.OptionalEvalPropKeySet
type OptionalEvalPropKeySet = context.OptionalEvalPropKeySet

// OptionalEvalPropDesc is an alias of context.OptionalEvalPropDesc
type OptionalEvalPropDesc = context.OptionalEvalPropDesc

func sqlMode(ctx EvalContext) mysql.SQLMode {
	return ctx.SQLMode()
}

func typeCtx(ctx EvalContext) types.Context {
	return ctx.TypeCtx()
}

func errCtx(ctx EvalContext) errctx.Context {
	return ctx.ErrCtx()
}

func location(ctx EvalContext) (loc *time.Location) {
	loc = ctx.Location()
	intest.AssertFunc(func() bool {
		tc := ctx.TypeCtx()
		intest.Assert(tc.Location() == loc)
		if ctx.GetOptionalPropSet().Contains(context.OptPropSessionVars) {
			vars, err := contextopt.SessionVarsPropReader{}.GetSessionVars(ctx)
			intest.AssertNoError(err)
			intest.Assert(vars.Location() == loc)
		}
		return true
	})
	return
}

func warningCount(ctx EvalContext) int {
	return ctx.WarningCount()
}

func truncateWarnings(ctx EvalContext, start int) []stmtctx.SQLWarn {
	return ctx.TruncateWarnings(start)
}