// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package repo

import (
	"bytes"
	"fmt"
	gotemplate "html/template"
	"io/ioutil"
	"path"
	"strings"

	"github.com/Unknwon/paginater"

	"github.com/gogits/git-module"

	"github.com/gogits/gogs/models"
	"github.com/gogits/gogs/modules/base"
	"github.com/gogits/gogs/modules/context"
	"github.com/gogits/gogs/modules/log"
	"github.com/gogits/gogs/modules/markdown"
	"github.com/gogits/gogs/modules/setting"
	"github.com/gogits/gogs/modules/template"
	"github.com/gogits/gogs/modules/template/highlight"
)

const (
	HOME     base.TplName = "repo/home"
	WATCHERS base.TplName = "repo/watchers"
	FORKS    base.TplName = "repo/forks"
)

func Home(ctx *context.Context) {
	title := ctx.Repo.Repository.Owner.Name + "/" + ctx.Repo.Repository.Name
	if len(ctx.Repo.Repository.Description) > 0 {
		title += ": " + ctx.Repo.Repository.Description
	}
	ctx.Data["Title"] = title
	ctx.Data["PageIsViewCode"] = true
	ctx.Data["RequireHighlightJS"] = true

	branchName := ctx.Repo.BranchName
	userName := ctx.Repo.Owner.Name
	repoName := ctx.Repo.Repository.Name

	branchLink := ctx.Repo.RepoLink + "/src/" + branchName
	treeLink := branchLink
	rawLink := ctx.Repo.RepoLink + "/raw/" + branchName
	// uploadFileLink := ctx.Repo.RepoLink + "/upload/" + branchName

	treePath := ctx.Repo.TreePath
	if len(treePath) > 0 {
		treeLink += "/" + treePath
	}

	entry, err := ctx.Repo.Commit.GetTreeEntryByPath(treePath)
	if err != nil {
		if git.IsErrNotExist(err) {
			ctx.Handle(404, "GetTreeEntryByPath", err)
		} else {
			ctx.Handle(500, "GetTreeEntryByPath", err)
		}
		return
	}

	if !entry.IsDir() {
		blob := entry.Blob()
		dataRc, err := blob.Data()
		if err != nil {
			ctx.Handle(404, "blob.Data", err)
			return
		}

		ctx.Data["FileSize"] = blob.Size()
		ctx.Data["IsFile"] = true
		ctx.Data["FileName"] = blob.Name()
		ctx.Data["HighlightClass"] = highlight.FileNameToHighlightClass(blob.Name())
		ctx.Data["FileLink"] = rawLink + "/" + treePath

		buf := make([]byte, 1024)
		n, _ := dataRc.Read(buf)
		if n > 0 {
			buf = buf[:n]
		}

		_, isTextFile := base.IsTextFile(buf)
		_, isImageFile := base.IsImageFile(buf)
		_, isPDFFile := base.IsPDFFile(buf)
		ctx.Data["IsFileText"] = isTextFile

		// Assume file is not editable first.
		if !isTextFile {
			ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_non_text_files")
		}

		switch {
		case isPDFFile:
			ctx.Data["IsPDFFile"] = true
		case isImageFile:
			ctx.Data["IsImageFile"] = true
		case isTextFile:
			if blob.Size() >= setting.UI.MaxDisplayFileSize {
				ctx.Data["IsFileTooLarge"] = true
			} else {
				d, _ := ioutil.ReadAll(dataRc)
				buf = append(buf, d...)

				isMarkdown := markdown.IsMarkdownFile(blob.Name())
				ctx.Data["IsMarkdown"] = isMarkdown

				readmeExist := isMarkdown || markdown.IsReadmeFile(blob.Name())
				ctx.Data["ReadmeExist"] = readmeExist
				if readmeExist {
					// TODO: don't need to render if it's a README but not Markdown file.
					ctx.Data["FileContent"] = string(markdown.Render(buf, path.Dir(treeLink), ctx.Repo.Repository.ComposeMetas()))
				} else {
					// Building code view blocks with line number on server side.
					var filecontent string
					if err, content := template.ToUTF8WithErr(buf); err != nil {
						if err != nil {
							log.Error(4, "ToUTF8WithErr: %s", err)
						}
						filecontent = string(buf)
					} else {
						filecontent = content
					}

					var output bytes.Buffer
					lines := strings.Split(filecontent, "\n")
					for index, line := range lines {
						output.WriteString(fmt.Sprintf(`<li class="L%d" rel="L%d">%s</li>`, index+1, index+1, gotemplate.HTMLEscapeString(line)) + "\n")
					}
					ctx.Data["FileContent"] = gotemplate.HTML(output.String())

					output.Reset()
					for i := 0; i < len(lines); i++ {
						output.WriteString(fmt.Sprintf(`<span id="L%d">%d</span>`, i+1, i+1))
					}
					ctx.Data["LineNums"] = gotemplate.HTML(output.String())
				}
			}

			if ctx.Repo.IsWriter() && ctx.Repo.IsViewBranch {
				ctx.Data["CanEditFile"] = true
				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.edit_this_file")
			} else if !ctx.Repo.IsViewBranch {
				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.must_be_on_a_branch")
			} else if !ctx.Repo.IsWriter() {
				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.fork_before_edit")
			}
		}

		if ctx.Repo.IsWriter() && ctx.Repo.IsViewBranch {
			ctx.Data["CanDeleteFile"] = true
			ctx.Data["DeleteFileTooltip"] = ctx.Tr("repo.editor.delete_this_file")
		} else if !ctx.Repo.IsViewBranch {
			ctx.Data["DeleteFileTooltip"] = ctx.Tr("repo.editor.must_be_on_a_branch")
		} else if !ctx.Repo.IsWriter() {
			ctx.Data["DeleteFileTooltip"] = ctx.Tr("repo.editor.must_have_write_access")
		}

	} else {
		// Directory and file list.
		tree, err := ctx.Repo.Commit.SubTree(treePath)
		if err != nil {
			ctx.Handle(404, "SubTree", err)
			return
		}

		entries, err := tree.ListEntries()
		if err != nil {
			ctx.Handle(500, "ListEntries", err)
			return
		}
		entries.Sort()

		ctx.Data["Files"], err = entries.GetCommitsInfo(ctx.Repo.Commit, treePath)
		if err != nil {
			ctx.Handle(500, "GetCommitsInfo", err)
			return
		}

		var readmeFile *git.Blob
		for _, f := range entries {
			if f.IsDir() || !markdown.IsReadmeFile(f.Name()) {
				continue
			} else {
				readmeFile = f.Blob()
				break
			}
		}

		if readmeFile != nil {
			ctx.Data["ReadmeInList"] = true
			ctx.Data["ReadmeExist"] = true
			if dataRc, err := readmeFile.Data(); err != nil {
				ctx.Handle(404, "repo.SinglereadmeFile.Data", err)
				return
			} else {

				buf := make([]byte, 1024)
				n, _ := dataRc.Read(buf)
				if n > 0 {
					buf = buf[:n]
				}

				ctx.Data["FileSize"] = readmeFile.Size()
				ctx.Data["FileLink"] = rawLink + "/" + treePath
				_, isTextFile := base.IsTextFile(buf)
				ctx.Data["FileIsText"] = isTextFile
				ctx.Data["FileName"] = readmeFile.Name()
				if isTextFile {
					d, _ := ioutil.ReadAll(dataRc)
					buf = append(buf, d...)
					switch {
					case markdown.IsMarkdownFile(readmeFile.Name()):
						ctx.Data["IsMarkdown"] = true
						buf = markdown.Render(buf, treeLink, ctx.Repo.Repository.ComposeMetas())
					default:
						buf = bytes.Replace(buf, []byte("\n"), []byte(`<br>`), -1)
					}
					ctx.Data["FileContent"] = string(buf)
				}
			}
		}

		lastCommit := ctx.Repo.Commit
		if len(treePath) > 0 {
			c, err := ctx.Repo.Commit.GetCommitByPath(treePath)
			if err != nil {
				ctx.Handle(500, "GetCommitByPath", err)
				return
			}
			lastCommit = c
		}
		ctx.Data["LastCommit"] = lastCommit
		ctx.Data["LastCommitUser"] = models.ValidateCommitWithEmail(lastCommit)

		if ctx.Repo.IsWriter() && ctx.Repo.IsViewBranch {
			ctx.Data["CanAddFile"] = true
			// if setting.Repository.Upload.Enabled {
			// 	ctx.Data["UploadFileLink"] = uploadFileLink + "/" + treePath
			// }
		}
	}

	ctx.Data["Username"] = userName
	ctx.Data["Reponame"] = repoName

	ec, err := ctx.Repo.GetEditorconfig()
	if err != nil && !git.IsErrNotExist(err) {
		ctx.Handle(500, "ErrGettingEditorconfig", err)
		return
	}
	ctx.Data["Editorconfig"] = ec
	var treenames []string
	paths := make([]string, 0)

	if len(treePath) > 0 {
		treenames = strings.Split(treePath, "/")
		for i := range treenames {
			paths = append(paths, strings.Join(treenames[0:i+1], "/"))
		}

		ctx.Data["HasParentPath"] = true
		if len(paths)-2 >= 0 {
			ctx.Data["ParentPath"] = "/" + paths[len(paths)-2]
		}
	}

	ctx.Data["Paths"] = paths
	ctx.Data["TreePath"] = treePath
	ctx.Data["TreeLink"] = treeLink
	ctx.Data["Treenames"] = treenames
	ctx.Data["BranchLink"] = branchLink
	ctx.HTML(200, HOME)
}

func RenderUserCards(ctx *context.Context, total int, getter func(page int) ([]*models.User, error), tpl base.TplName) {
	page := ctx.QueryInt("page")
	if page <= 0 {
		page = 1
	}
	pager := paginater.New(total, models.ItemsPerPage, page, 5)
	ctx.Data["Page"] = pager

	items, err := getter(pager.Current())
	if err != nil {
		ctx.Handle(500, "getter", err)
		return
	}
	ctx.Data["Cards"] = items

	ctx.HTML(200, tpl)
}

func Watchers(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("repo.watchers")
	ctx.Data["CardsTitle"] = ctx.Tr("repo.watchers")
	ctx.Data["PageIsWatchers"] = true
	RenderUserCards(ctx, ctx.Repo.Repository.NumWatches, ctx.Repo.Repository.GetWatchers, WATCHERS)
}

func Stars(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("repo.stargazers")
	ctx.Data["CardsTitle"] = ctx.Tr("repo.stargazers")
	ctx.Data["PageIsStargazers"] = true
	RenderUserCards(ctx, ctx.Repo.Repository.NumStars, ctx.Repo.Repository.GetStargazers, WATCHERS)
}

func Forks(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("repos.forks")

	forks, err := ctx.Repo.Repository.GetForks()
	if err != nil {
		ctx.Handle(500, "GetForks", err)
		return
	}

	for _, fork := range forks {
		if err = fork.GetOwner(); err != nil {
			ctx.Handle(500, "GetOwner", err)
			return
		}
	}
	ctx.Data["Forks"] = forks

	ctx.HTML(200, FORKS)
}