package main

import (
	"fmt"
	"regexp"
	"strconv"
	"strings"

	"github.com/docker/docker/pkg/integration/checker"
	"github.com/go-check/check"
)

// This is a heisen-test.  Because the created timestamp of images and the behavior of
// sort is not predictable it doesn't always fail.
func (s *DockerSuite) TestBuildHistory(c *check.C) {
	testRequires(c, DaemonIsLinux) // TODO Windows: This test passes on Windows,
	// but currently adds a disproportionate amount of time for the value it has.
	// Removing it from Windows CI for now, but this will be revisited in the
	// TP5 timeframe when perf is better.
	name := "testbuildhistory"
	_, err := buildImage(name, `FROM busybox
RUN echo "A"
RUN echo "B"
RUN echo "C"
RUN echo "D"
RUN echo "E"
RUN echo "F"
RUN echo "G"
RUN echo "H"
RUN echo "I"
RUN echo "J"
RUN echo "K"
RUN echo "L"
RUN echo "M"
RUN echo "N"
RUN echo "O"
RUN echo "P"
RUN echo "Q"
RUN echo "R"
RUN echo "S"
RUN echo "T"
RUN echo "U"
RUN echo "V"
RUN echo "W"
RUN echo "X"
RUN echo "Y"
RUN echo "Z"`,
		true)

	c.Assert(err, checker.IsNil)

	out, _ := dockerCmd(c, "history", "testbuildhistory")
	actualValues := strings.Split(out, "\n")[1:27]
	expectedValues := [26]string{"Z", "Y", "X", "W", "V", "U", "T", "S", "R", "Q", "P", "O", "N", "M", "L", "K", "J", "I", "H", "G", "F", "E", "D", "C", "B", "A"}

	for i := 0; i < 26; i++ {
		echoValue := fmt.Sprintf("echo \"%s\"", expectedValues[i])
		actualValue := actualValues[i]
		c.Assert(actualValue, checker.Contains, echoValue)
	}

}

func (s *DockerSuite) TestHistoryExistentImage(c *check.C) {
	dockerCmd(c, "history", "busybox")
}

func (s *DockerSuite) TestHistoryNonExistentImage(c *check.C) {
	_, _, err := dockerCmdWithError("history", "testHistoryNonExistentImage")
	c.Assert(err, checker.NotNil, check.Commentf("history on a non-existent image should fail."))
}

func (s *DockerSuite) TestHistoryImageWithComment(c *check.C) {
	name := "testhistoryimagewithcomment"

	// make a image through docker commit <container id> [ -m messages ]

	dockerCmd(c, "run", "--name", name, "busybox", "true")
	dockerCmd(c, "wait", name)

	comment := "This_is_a_comment"
	dockerCmd(c, "commit", "-m="+comment, name, name)

	// test docker history <image id> to check comment messages

	out, _ := dockerCmd(c, "history", name)
	outputTabs := strings.Fields(strings.Split(out, "\n")[1])
	actualValue := outputTabs[len(outputTabs)-1]
	c.Assert(actualValue, checker.Contains, comment)
}

func (s *DockerSuite) TestHistoryHumanOptionFalse(c *check.C) {
	out, _ := dockerCmd(c, "history", "--human=false", "busybox")
	lines := strings.Split(out, "\n")
	sizeColumnRegex, _ := regexp.Compile("SIZE +")
	indices := sizeColumnRegex.FindStringIndex(lines[0])
	startIndex := indices[0]
	endIndex := indices[1]
	for i := 1; i < len(lines)-1; i++ {
		if endIndex > len(lines[i]) {
			endIndex = len(lines[i])
		}
		sizeString := lines[i][startIndex:endIndex]

		_, err := strconv.Atoi(strings.TrimSpace(sizeString))
		c.Assert(err, checker.IsNil, check.Commentf("The size '%s' was not an Integer", sizeString))
	}
}

func (s *DockerSuite) TestHistoryHumanOptionTrue(c *check.C) {
	out, _ := dockerCmd(c, "history", "--human=true", "busybox")
	lines := strings.Split(out, "\n")
	sizeColumnRegex, _ := regexp.Compile("SIZE +")
	humanSizeRegexRaw := "\\d+.*B" // Matches human sizes like 10 MB, 3.2 KB, etc
	indices := sizeColumnRegex.FindStringIndex(lines[0])
	startIndex := indices[0]
	endIndex := indices[1]
	for i := 1; i < len(lines)-1; i++ {
		if endIndex > len(lines[i]) {
			endIndex = len(lines[i])
		}
		sizeString := lines[i][startIndex:endIndex]
		c.Assert(strings.TrimSpace(sizeString), checker.Matches, humanSizeRegexRaw, check.Commentf("The size '%s' was not in human format", sizeString))
	}
}