/*
 * SPDX-FileCopyrightText: © 2017-2025 Istari Digital, Inc.
 * SPDX-License-Identifier: Apache-2.0
 */

package badger

import (
	
	
	
	
	

	
	
)

type keyRange struct {
	left  []byte
	right []byte
	inf   bool
	size  int64 // size is used for Key splits.
}

func ( keyRange) () bool {
	return len(.left) == 0 && len(.right) == 0 && !.inf
}

var infRange = keyRange{inf: true}

func ( keyRange) () string {
	return fmt.Sprintf("[left=%x, right=%x, inf=%v]", .left, .right, .inf)
}

func ( keyRange) ( keyRange) bool {
	return bytes.Equal(.left, .left) &&
		bytes.Equal(.right, .right) &&
		.inf == .inf
}

func ( *keyRange) ( keyRange) {
	// TODO(ibrahim): Is this needed?
	if .isEmpty() {
		return
	}
	if .isEmpty() {
		* = 
	}
	if len(.left) == 0 || y.CompareKeys(.left, .left) < 0 {
		.left = .left
	}
	if len(.right) == 0 || y.CompareKeys(.right, .right) > 0 {
		.right = .right
	}
	if .inf {
		.inf = true
	}
}

func ( keyRange) ( keyRange) bool {
	// Empty keyRange always overlaps.
	if .isEmpty() {
		return true
	}
	// TODO(ibrahim): Do you need this?
	// Empty dst doesn't overlap with anything.
	if .isEmpty() {
		return false
	}
	if .inf || .inf {
		return true
	}

	// [dst.left, dst.right] ... [r.left, r.right]
	// If my left is greater than dst right, we have no overlap.
	if y.CompareKeys(.left, .right) > 0 {
		return false
	}
	// [r.left, r.right] ... [dst.left, dst.right]
	// If my right is less than dst left, we have no overlap.
	if y.CompareKeys(.right, .left) < 0 {
		return false
	}
	// We have overlap.
	return true
}

// getKeyRange returns the smallest and the biggest in the list of tables.
// TODO(naman): Write a test for this. The smallest and the biggest should
// be the smallest of the leftmost table and the biggest of the right most table.
func getKeyRange( ...*table.Table) keyRange {
	if len() == 0 {
		return keyRange{}
	}
	 := [0].Smallest()
	 := [0].Biggest()
	for  := 1;  < len(); ++ {
		if y.CompareKeys([].Smallest(), ) < 0 {
			 = [].Smallest()
		}
		if y.CompareKeys([].Biggest(), ) > 0 {
			 = [].Biggest()
		}
	}

	// We pick all the versions of the smallest and the biggest key. Note that version zero would
	// be the rightmost key, considering versions are default sorted in descending order.
	return keyRange{
		left:  y.KeyWithTs(y.ParseKey(), math.MaxUint64),
		right: y.KeyWithTs(y.ParseKey(), 0),
	}
}

type levelCompactStatus struct {
	ranges  []keyRange
	delSize int64
}

func ( *levelCompactStatus) () string {
	var  bytes.Buffer
	for ,  := range .ranges {
		.WriteString(.String())
	}
	return .String()
}

func ( *levelCompactStatus) ( keyRange) bool {
	for ,  := range .ranges {
		if .overlapsWith() {
			return true
		}
	}
	return false
}

func ( *levelCompactStatus) ( keyRange) bool {
	 := .ranges[:0]
	var  bool
	for ,  := range .ranges {
		if !.equals() {
			 = append(, )
		} else {
			 = true
		}
	}
	.ranges = 
	return 
}

type compactStatus struct {
	sync.RWMutex
	levels []*levelCompactStatus
	tables map[uint64]struct{}
}

func ( *compactStatus) ( int,  keyRange) bool {
	.RLock()
	defer .RUnlock()

	 := .levels[]
	return .overlapsWith()
}

func ( *compactStatus) ( int) int64 {
	.RLock()
	defer .RUnlock()
	return .levels[].delSize
}

type thisAndNextLevelRLocked struct{}

// compareAndAdd will check whether we can run this compactDef. That it doesn't overlap with any
// other running compaction. If it can be run, it would store this run in the compactStatus state.
func ( *compactStatus) ( thisAndNextLevelRLocked,  compactDef) bool {
	.Lock()
	defer .Unlock()

	 := .thisLevel.level
	y.AssertTruef( < len(.levels), "Got level %d. Max levels: %d", , len(.levels))
	 := .levels[.thisLevel.level]
	 := .levels[.nextLevel.level]

	if .overlapsWith(.thisRange) {
		return false
	}
	if .overlapsWith(.nextRange) {
		return false
	}
	// Check whether this level really needs compaction or not. Otherwise, we'll end up
	// running parallel compactions for the same level.
	// Update: We should not be checking size here. Compaction priority already did the size checks.
	// Here we should just be executing the wish of others.

	.ranges = append(.ranges, .thisRange)
	.ranges = append(.ranges, .nextRange)
	.delSize += .thisSize
	for ,  := range append(.top, .bot...) {
		.tables[.ID()] = struct{}{}
	}
	return true
}

func ( *compactStatus) ( compactDef) {
	.Lock()
	defer .Unlock()

	 := .thisLevel.level
	y.AssertTruef( < len(.levels), "Got level %d. Max levels: %d", , len(.levels))

	 := .levels[.thisLevel.level]
	 := .levels[.nextLevel.level]

	.delSize -= .thisSize
	 := .remove(.thisRange)
	// The following check makes sense only if we're compacting more than one
	// table. In case of the max level, we might rewrite a single table to
	// remove stale data.
	if .thisLevel != .nextLevel && !.nextRange.isEmpty() {
		 = .remove(.nextRange) && 
	}

	if ! {
		 := .thisRange
		 := .nextRange
		fmt.Printf("Looking for: %s in this level %d.\n", , )
		fmt.Printf("This Level:\n%s\n", .debug())
		fmt.Println()
		fmt.Printf("Looking for: %s in next level %d.\n", , .nextLevel.level)
		fmt.Printf("Next Level:\n%s\n", .debug())
		log.Fatal("keyRange not found")
	}
	for ,  := range append(.top, .bot...) {
		,  := .tables[.ID()]
		y.AssertTrue()
		delete(.tables, .ID())
	}
}