/* Vuls - Vulnerability Scanner
Copyright (C) 2016  Future Architect, Inc. Japan.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package report

import (
	"bytes"
	"fmt"
	"strings"

	"github.com/future-architect/vuls/config"
	"github.com/future-architect/vuls/models"
	"github.com/gosuri/uitable"
)

const maxColWidth = 80

func formatScanSummary(rs ...models.ScanResult) string {
	table := uitable.New()
	table.MaxColWidth = maxColWidth
	table.Wrap = true
	for _, r := range rs {
		var cols []interface{}
		if len(r.Errors) == 0 {
			cols = []interface{}{
				r.FormatServerName(),
				fmt.Sprintf("%s%s", r.Family, r.Release),
				fmt.Sprintf("%d CVEs", len(r.ScannedCves)),
				r.Packages.FormatUpdatablePacksSummary(),
			}
		} else {
			cols = []interface{}{
				r.FormatServerName(),
				"Error",
				"",
				"Run with --debug to view the details",
			}
		}
		table.AddRow(cols...)
	}
	return fmt.Sprintf("%s\n", table)
}

func formatOneLineSummary(rs ...models.ScanResult) string {
	table := uitable.New()
	table.MaxColWidth = maxColWidth
	table.Wrap = true
	for _, r := range rs {
		var cols []interface{}
		if len(r.Errors) == 0 {
			cols = []interface{}{
				r.FormatServerName(),
				r.CveSummary(),
				r.Packages.FormatUpdatablePacksSummary(),
			}
		} else {
			cols = []interface{}{
				r.FormatServerName(),
				"Error: Scan with --debug to view the details",
				"",
			}
		}
		table.AddRow(cols...)
	}
	return fmt.Sprintf("%s\n", table)
}

func formatShortPlainText(r models.ScanResult) string {
	stable := uitable.New()
	stable.MaxColWidth = maxColWidth
	stable.Wrap = true

	cves := r.KnownCves
	if !config.Conf.IgnoreUnscoredCves {
		cves = append(cves, r.UnknownCves...)
	}

	var buf bytes.Buffer
	for i := 0; i < len(r.ServerInfo()); i++ {
		buf.WriteString("=")
	}
	header := fmt.Sprintf("%s\n%s\n%s\t%s\n\n",
		r.ServerInfo(),
		buf.String(),
		r.CveSummary(),
		r.Packages.FormatUpdatablePacksSummary(),
	)

	if len(r.Errors) != 0 {
		return fmt.Sprintf(
			"%s\nError: Scan with --debug to view the details\n%s\n\n",
			header, r.Errors)
	}

	if len(cves) == 0 {
		return fmt.Sprintf(`
%s
No CVE-IDs are found in updatable packages.
%s
`, header, r.Packages.FormatUpdatablePacksSummary())
	}

	for _, d := range cves {
		var packsVer string
		for _, p := range d.Packages {
			packsVer += fmt.Sprintf(
				"%s -> %s\n", p.FormatCurrentVer(), p.FormatNewVer())
		}
		for _, n := range d.CpeNames {
			packsVer += n
		}

		var scols []string
		switch {
		//  case config.Conf.Lang == "ja" &&
		//TODO
		//  0 < d.CveDetail.Jvn.CvssScore():
		//  summary := fmt.Sprintf("%s\n%s\n%s\n%sConfidence: %v",
		//      d.CveDetail.Jvn.CveTitle(),
		//      d.CveDetail.Jvn.Link(),
		//      distroLinks(d, r.Family)[0].url,
		//      packsVer,
		//      d.VulnInfo.Confidence,
		//  )
		//  scols = []string{
		//      d.CveDetail.CveID,
		//      fmt.Sprintf("%-4.1f (%s)",
		//          d.CveDetail.CvssScore(config.Conf.Lang),
		//          d.CveDetail.Jvn.CvssSeverity(),
		//      ),
		//      summary,
		//  }

		case 0 < d.CvssV2Score():
			var nvd *models.CveContent
			if cont, found := d.Get(models.NVD); found {
				nvd = cont
			}
			summary := fmt.Sprintf("%s\n%s/%s\n%s\n%sConfidence: %v",
				nvd.Summary,
				cveDetailsBaseURL,
				d.VulnInfo.CveID,
				distroLinks(d, r.Family)[0].url,
				packsVer,
				d.VulnInfo.Confidence,
			)
			scols = []string{
				d.VulnInfo.CveID,
				fmt.Sprintf("%-4.1f (%s)",
					d.CvssV2Score(),
					"TODO",
				),
				summary,
			}
		default:
			summary := fmt.Sprintf("%s\n%sConfidence: %v",
				distroLinks(d, r.Family)[0].url, packsVer, d.VulnInfo.Confidence)
			scols = []string{
				d.VulnInfo.CveID,
				"?",
				summary,
			}
		}

		cols := make([]interface{}, len(scols))
		for i := range cols {
			cols[i] = scols[i]
		}
		stable.AddRow(cols...)
		stable.AddRow("")
	}
	return fmt.Sprintf("%s\n%s\n", header, stable)
}

func formatFullPlainText(r models.ScanResult) string {
	serverInfo := r.ServerInfo()

	var buf bytes.Buffer
	for i := 0; i < len(serverInfo); i++ {
		buf.WriteString("=")
	}
	header := fmt.Sprintf("%s\n%s\n%s\t%s\n",
		r.ServerInfo(),
		buf.String(),
		r.CveSummary(),
		r.Packages.FormatUpdatablePacksSummary(),
	)

	if len(r.Errors) != 0 {
		return fmt.Sprintf(
			"%s\nError: Scan with --debug to view the details\n%s\n\n",
			header, r.Errors)
	}

	if len(r.KnownCves) == 0 && len(r.UnknownCves) == 0 {
		return fmt.Sprintf(`
%s
No CVE-IDs are found in updatable packages.
%s
`, header, r.Packages.FormatUpdatablePacksSummary())
	}

	scoredReport, unscoredReport := []string{}, []string{}
	scoredReport, unscoredReport = formatPlainTextDetails(r, r.Family)

	unscored := ""
	if !config.Conf.IgnoreUnscoredCves {
		unscored = strings.Join(unscoredReport, "\n\n")
	}

	scored := strings.Join(scoredReport, "\n\n")
	detail := fmt.Sprintf(`
%s

%s
`,
		scored,
		unscored,
	)
	return fmt.Sprintf("%s\n%s\n%s", header, detail, formatChangelogs(r))
}

//TODO
func formatPlainTextDetails(r models.ScanResult, osFamily string) (scoredReport, unscoredReport []string) {
	//  for _, cve := range r.KnownCves {
	//      switch config.Conf.Lang {
	//      case "en":
	//          if 0 < cve.CveDetail.Nvd.CvssScore() {
	//              scoredReport = append(
	//                  scoredReport, formatPlainTextDetailsLangEn(cve, osFamily))
	//          } else {
	//              scoredReport = append(
	//                  scoredReport, formatPlainTextUnknownCve(cve, osFamily))
	//          }
	//      case "ja":
	//          if 0 < cve.CveDetail.Jvn.CvssScore() {
	//              scoredReport = append(
	//                  scoredReport, formatPlainTextDetailsLangJa(cve, osFamily))
	//          } else if 0 < cve.CveDetail.Nvd.CvssScore() {
	//              scoredReport = append(
	//                  scoredReport, formatPlainTextDetailsLangEn(cve, osFamily))
	//          } else {
	//              scoredReport = append(
	//                  scoredReport, formatPlainTextUnknownCve(cve, osFamily))
	//          }
	//      }
	//  }
	//  for _, cve := range r.UnknownCves {
	//      unscoredReport = append(
	//          unscoredReport, formatPlainTextUnknownCve(cve, osFamily))
	//  }
	return
}

func formatPlainTextUnknownCve(cveInfo models.CveInfo, osFamily string) string {
	cveID := cveInfo.VulnInfo.CveID
	dtable := uitable.New()
	dtable.MaxColWidth = maxColWidth
	dtable.Wrap = true
	dtable.AddRow(cveID)
	dtable.AddRow("-------------")
	dtable.AddRow("Score", "?")
	dtable.AddRow("NVD", fmt.Sprintf("%s/%s", nvdBaseURL, cveID))
	dlinks := distroLinks(cveInfo, osFamily)
	for _, link := range dlinks {
		dtable.AddRow(link.title, link.url)
	}
	dtable.AddRow("CVE Details", fmt.Sprintf("%s/%s", cveDetailsBaseURL, cveID))
	dtable = addPackageInfos(dtable, cveInfo.Packages)
	dtable = addCpeNames(dtable, cveInfo.CpeNames)
	dtable.AddRow("Confidence", cveInfo.VulnInfo.Confidence)

	return fmt.Sprintf("%s", dtable)
}

//TODO
func formatPlainTextDetailsLangJa(cveInfo models.CveInfo, osFamily string) string {
	return "TODO"
	//  cveDetail := cveInfo.CveDetail
	//  cveID := cveDetail.CveID
	//  jvn := cveDetail.Jvn

	//  dtable := uitable.New()
	//  dtable.MaxColWidth = maxColWidth
	//  dtable.Wrap = true
	//  dtable.AddRow(cveID)
	//  dtable.AddRow("-------------")
	//  if score := cveDetail.Jvn.CvssScore(); 0 < score {
	//      dtable.AddRow("Score",
	//          fmt.Sprintf("%4.1f (%s)",
	//              cveDetail.Jvn.CvssScore(),
	//              jvn.CvssSeverity(),
	//          ))
	//  } else {
	//      dtable.AddRow("Score", "?")
	//  }
	//  dtable.AddRow("Vector", jvn.CvssVector())
	//  dtable.AddRow("Title", jvn.CveTitle())
	//  dtable.AddRow("Description", jvn.CveSummary())
	//  dtable.AddRow(cveDetail.CweID(), cweURL(cveDetail.CweID()))
	//  dtable.AddRow(cveDetail.CweID()+"(JVN)", cweJvnURL(cveDetail.CweID()))

	//  dtable.AddRow("JVN", jvn.Link())
	//  dtable.AddRow("NVD", fmt.Sprintf("%s/%s", nvdBaseURL, cveID))
	//  dtable.AddRow("MITRE", fmt.Sprintf("%s%s", mitreBaseURL, cveID))
	//  dtable.AddRow("CVE Details", fmt.Sprintf("%s/%s", cveDetailsBaseURL, cveID))
	//  dtable.AddRow("CVSSv2 Clac", fmt.Sprintf(cvssV2CalcBaseURL, cveID))
	//  dtable.AddRow("CVSSv3 Clac", fmt.Sprintf(cvssV3CalcBaseURL, cveID))

	//  dlinks := distroLinks(cveInfo, osFamily)
	//  for _, link := range dlinks {
	//      dtable.AddRow(link.title, link.url)
	//  }

	//  dtable = addPackageInfos(dtable, cveInfo.Packages)
	//  dtable = addCpeNames(dtable, cveInfo.CpeNames)
	//  dtable.AddRow("Confidence", cveInfo.VulnInfo.Confidence)

	//  return fmt.Sprintf("%s", dtable)
}

//TODO
func formatPlainTextDetailsLangEn(d models.CveInfo, osFamily string) string {
	return ""
	//  cveDetail := d.CveDetail
	//  cveID := cveDetail.CveID
	//  nvd := cveDetail.Nvd

	//  dtable := uitable.New()
	//  dtable.MaxColWidth = maxColWidth
	//  dtable.Wrap = true
	//  dtable.AddRow(cveID)
	//  dtable.AddRow("-------------")

	//  if score := cveDetail.Nvd.CvssScore(); 0 < score {
	//      dtable.AddRow("Score",
	//          fmt.Sprintf("%4.1f (%s)",
	//              cveDetail.Nvd.CvssScore(),
	//              nvd.CvssSeverity(),
	//          ))
	//  } else {
	//      dtable.AddRow("Score", "?")
	//  }

	//  dtable.AddRow("Vector", nvd.CvssVector())
	//  dtable.AddRow("Summary", nvd.CveSummary())
	//  dtable.AddRow("CWE", cweURL(cveDetail.CweID()))

	//  dtable.AddRow("NVD", fmt.Sprintf("%s/%s", nvdBaseURL, cveID))
	//  dtable.AddRow("MITRE", fmt.Sprintf("%s%s", mitreBaseURL, cveID))
	//  dtable.AddRow("CVE Details", fmt.Sprintf("%s/%s", cveDetailsBaseURL, cveID))
	//  dtable.AddRow("CVSSv2 Clac", fmt.Sprintf(cvssV2CalcBaseURL, cveID))
	//  dtable.AddRow("CVSSv3 Clac", fmt.Sprintf(cvssV3CalcBaseURL, cveID))

	//  links := distroLinks(d, osFamily)
	//  for _, link := range links {
	//      dtable.AddRow(link.title, link.url)
	//  }
	//  dtable = addPackageInfos(dtable, d.Packages)
	//  dtable = addCpeNames(dtable, d.CpeNames)
	//  dtable.AddRow("Confidence", d.VulnInfo.Confidence)

	//  return fmt.Sprintf("%s\n", dtable)
}

type distroLink struct {
	title string
	url   string
}

// distroLinks add Vendor URL of the CVE to table
func distroLinks(cveInfo models.CveInfo, osFamily string) []distroLink {
	cveID := cveInfo.VulnInfo.CveID
	switch osFamily {
	case "rhel", "centos":
		links := []distroLink{
			{
				"RHEL-CVE",
				fmt.Sprintf("%s/%s", redhatSecurityBaseURL, cveID),
			},
		}
		for _, advisory := range cveInfo.DistroAdvisories {
			aidURL := strings.Replace(advisory.AdvisoryID, ":", "-", -1)
			links = append(links, distroLink{
				//  "RHEL-errata",
				advisory.AdvisoryID,
				fmt.Sprintf(redhatRHSABaseBaseURL, aidURL),
			})
		}
		return links
	case "oraclelinux":
		links := []distroLink{
			{
				"Oracle-CVE",
				fmt.Sprintf(oracleSecurityBaseURL, cveID),
			},
		}
		for _, advisory := range cveInfo.DistroAdvisories {
			links = append(links, distroLink{
				// "Oracle-ELSA"
				advisory.AdvisoryID,
				fmt.Sprintf(oracleELSABaseBaseURL, advisory.AdvisoryID),
			})
		}
		return links
	case "amazon":
		links := []distroLink{
			{
				"RHEL-CVE",
				fmt.Sprintf("%s/%s", redhatSecurityBaseURL, cveID),
			},
		}
		for _, advisory := range cveInfo.DistroAdvisories {
			links = append(links, distroLink{
				//  "Amazon-ALAS",
				advisory.AdvisoryID,
				fmt.Sprintf(amazonSecurityBaseURL, advisory.AdvisoryID),
			})
		}
		return links
	case "ubuntu":
		return []distroLink{
			{
				"Ubuntu-CVE",
				fmt.Sprintf("%s/%s", ubuntuSecurityBaseURL, cveID),
			},
			//TODO Ubuntu USN
		}
	case "debian":
		return []distroLink{
			{
				"Debian-CVE",
				fmt.Sprintf("%s/%s", debianTrackerBaseURL, cveID),
			},
			//  TODO Debian dsa
		}
	case "FreeBSD":
		links := []distroLink{}
		for _, advisory := range cveInfo.DistroAdvisories {
			links = append(links, distroLink{
				"FreeBSD-VuXML",
				fmt.Sprintf(freeBSDVuXMLBaseURL, advisory.AdvisoryID),
			})
		}
		return links
	default:
		return []distroLink{}
	}
}

// addPackageInfos add package information related the CVE to table
func addPackageInfos(table *uitable.Table, packs []models.PackageInfo) *uitable.Table {
	for i, p := range packs {
		var title string
		if i == 0 {
			title = "Package"
		}
		ver := fmt.Sprintf(
			"%s -> %s", p.FormatCurrentVer(), p.FormatNewVer())
		table.AddRow(title, ver)
	}
	return table
}

func addCpeNames(table *uitable.Table, names []string) *uitable.Table {
	for _, n := range names {
		table.AddRow("CPE", fmt.Sprintf("%s", n))
	}
	return table
}

func cweURL(cweID string) string {
	return fmt.Sprintf("https://cwe.mitre.org/data/definitions/%s.html",
		strings.TrimPrefix(cweID, "CWE-"))
}

func cweJvnURL(cweID string) string {
	return fmt.Sprintf("http://jvndb.jvn.jp/ja/cwe/%s.html", cweID)
}

func formatChangelogs(r models.ScanResult) string {
	buf := []string{}
	for _, p := range r.Packages {
		if p.NewVersion == "" {
			continue
		}
		clog := formatOneChangelog(p)
		buf = append(buf, clog, "\n\n")
	}
	return strings.Join(buf, "\n")
}

func formatOneChangelog(p models.PackageInfo) string {
	buf := []string{}
	if p.NewVersion == "" {
		return ""
	}

	packVer := fmt.Sprintf("%s -> %s",
		p.FormatCurrentVer(), p.FormatNewVer())
	var delim bytes.Buffer
	for i := 0; i < len(packVer); i++ {
		delim.WriteString("-")
	}

	clog := p.Changelog.Contents
	if lines := strings.Split(clog, "\n"); len(lines) != 0 {
		clog = strings.Join(lines[0:len(lines)-1], "\n")
	}

	switch p.Changelog.Method {
	case models.FailedToGetChangelog:
		clog = "No changelogs"
	case models.FailedToFindVersionInChangelog:
		clog = "Failed to parse changelogs. For detials, check yourself"
	}
	buf = append(buf, packVer, delim.String(), clog)
	return strings.Join(buf, "\n")
}