package app

import jp.sf.amateras.scalatra.forms._

import service._
import IssuesService._
import util.{CollaboratorsAuthenticator, ReferrerAuthenticator, ReadableUsersAuthenticator}
import org.scalatra.Ok

class IssuesController extends IssuesControllerBase
  with IssuesService with RepositoryService with AccountService with LabelsService with MilestonesService with ActivityService
  with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator

trait IssuesControllerBase extends ControllerBase {
  self: IssuesService with RepositoryService with LabelsService with MilestonesService with ActivityService
    with ReadableUsersAuthenticator with ReferrerAuthenticator with CollaboratorsAuthenticator =>

  case class IssueCreateForm(title: String, content: Option[String],
    assignedUserName: Option[String], milestoneId: Option[Int], labelNames: Option[String])
  case class IssueEditForm(title: String, content: Option[String])
  case class CommentForm(issueId: Int, content: String)
  case class IssueStateForm(issueId: Int, content: Option[String])

  val issueCreateForm = mapping(
      "title"            -> trim(label("Title", text(required))),
      "content"          -> trim(optional(text())),
      "assignedUserName" -> trim(optional(text())),
      "milestoneId"      -> trim(optional(number())),
      "labelNames"       -> trim(optional(text()))
    )(IssueCreateForm.apply)

  val issueEditForm = mapping(
      "title"   -> trim(label("Title", text(required))),
      "content" -> trim(optional(text()))
    )(IssueEditForm.apply)

  val commentForm = mapping(
      "issueId" -> label("Issue Id", number()),
      "content" -> trim(label("Comment", text(required)))
    )(CommentForm.apply)

  val issueStateForm = mapping(
      "issueId" -> label("Issue Id", number()),
      "content" -> trim(optional(text()))
    )(IssueStateForm.apply)

  get("/:owner/:repository/issues")(referrersOnly {
    searchIssues("all", _)
  })

  get("/:owner/:repository/issues/assigned/:userName")(referrersOnly {
    searchIssues("assigned", _)
  })

  get("/:owner/:repository/issues/created_by/:userName")(referrersOnly {
    searchIssues("created_by", _)
  })

  get("/:owner/:repository/issues/:id")(referrersOnly { repository =>
    val owner   = repository.owner
    val name    = repository.name
    val issueId = params("id")

    getIssue(owner, name, issueId) map {
      issues.html.issue(
          _,
          getComments(owner, name, issueId.toInt),
          getIssueLabels(owner, name, issueId.toInt),
          (getCollaborators(owner, name) :+ owner).sorted,
          getMilestonesWithIssueCount(owner, name),
          getLabels(owner, name),
          hasWritePermission(owner, name, context.loginAccount),
          repository)
    } getOrElse NotFound
  })

  get("/:owner/:repository/issues/new")(readableUsersOnly { repository =>
    val owner = repository.owner
    val name  = repository.name

    issues.html.create(
        (getCollaborators(owner, name) :+ owner).sorted,
        getMilestones(owner, name),
        getLabels(owner, name),
        hasWritePermission(owner, name, context.loginAccount),
        repository)
  })

  post("/:owner/:repository/issues/new", issueCreateForm)(readableUsersOnly { (form, repository) =>
    val owner    = repository.owner
    val name     = repository.name
    val writable = hasWritePermission(owner, name, context.loginAccount)
    val userName = context.loginAccount.get.userName

    // insert issue
    val issueId = createIssue(owner, name, userName, form.title, form.content,
      if(writable) form.assignedUserName else None,
      if(writable) form.milestoneId else None)

    // insert labels
    if(writable){
      form.labelNames.map { value =>
        val labels = getLabels(owner, name)
        value.split(",").foreach { labelName =>
          labels.find(_.labelName == labelName).map { label =>
            registerIssueLabel(owner, name, issueId, label.labelId)
          }
        }
      }
    }

    // record activity
    recordCreateIssueActivity(owner, name, userName, issueId, form.title)

    redirect(s"/${owner}/${name}/issues/${issueId}")
  })

  ajaxPost("/:owner/:repository/issues/edit/:id", issueEditForm)(readableUsersOnly { (form, repository) =>
    val owner = repository.owner
    val name  = repository.name

    getIssue(owner, name, params("id")).map { issue =>
      if(isEditable(owner, name, issue.openedUserName)){
        updateIssue(owner, name, issue.issueId, form.title, form.content)
        redirect(s"/${owner}/${name}/issues/_data/${issue.issueId}")
      } else Unauthorized
    } getOrElse NotFound
  })

  post("/:owner/:repository/issue_comments/new", commentForm)(readableUsersOnly { (form, repository) =>
    handleComment(form.issueId, Some(form.content), repository)() map { id =>
      redirect(s"/${repository.owner}/${repository.name}/issues/${form.issueId}#comment-${id}")
    } getOrElse NotFound
  })

  post("/:owner/:repository/issue_comments/state", issueStateForm)(readableUsersOnly { (form, repository) =>
    handleComment(form.issueId, form.content, repository)() map { id =>
      redirect(s"/${repository.owner}/${repository.name}/issues/${form.issueId}#comment-${id}")
    } getOrElse NotFound
  })

  ajaxPost("/:owner/:repository/issue_comments/edit/:id", commentForm)(readableUsersOnly { (form, repository) =>
    val owner = repository.owner
    val name  = repository.name

    getComment(owner, name, params("id")).map { comment =>
      if(isEditable(owner, name, comment.commentedUserName)){
        updateComment(comment.commentId, form.content)
        redirect(s"/${owner}/${name}/issue_comments/_data/${comment.commentId}")
      } else Unauthorized
    } getOrElse NotFound
  })

  ajaxGet("/:owner/:repository/issues/_data/:id")(readableUsersOnly { repository =>
    getIssue(repository.owner, repository.name, params("id")) map { x =>
      if(isEditable(x.userName, x.repositoryName, x.openedUserName)){
        params.get("dataType") collect {
          case t if t == "html" => issues.html.editissue(
              x.title, x.content, x.issueId, x.userName, x.repositoryName)
        } getOrElse {
          contentType = formats("json")
          org.json4s.jackson.Serialization.write(
              Map("title"   -> x.title,
                  "content" -> view.Markdown.toHtml(x.content getOrElse "No description given.",
                      repository, false, true)
              ))
        }
      } else Unauthorized
    } getOrElse NotFound
  })

  ajaxGet("/:owner/:repository/issue_comments/_data/:id")(readableUsersOnly { repository =>
    getComment(repository.owner, repository.name, params("id")) map { x =>
      if(isEditable(x.userName, x.repositoryName, x.commentedUserName)){
        params.get("dataType") collect {
          case t if t == "html" => issues.html.editcomment(
              x.content, x.commentId, x.userName, x.repositoryName)
        } getOrElse {
          contentType = formats("json")
          org.json4s.jackson.Serialization.write(
              Map("content" -> view.Markdown.toHtml(x.content,
                  repository, false, true)
              ))
        }
      } else Unauthorized
    } getOrElse NotFound
  })

  ajaxPost("/:owner/:repository/issues/:id/label/new")(collaboratorsOnly { repository =>
    val issueId = params("id").toInt

    registerIssueLabel(repository.owner, repository.name, issueId, params("labelId").toInt)
    issues.html.labellist(getIssueLabels(repository.owner, repository.name, issueId))
  })

  ajaxPost("/:owner/:repository/issues/:id/label/delete")(collaboratorsOnly { repository =>
    val issueId = params("id").toInt

    deleteIssueLabel(repository.owner, repository.name, issueId, params("labelId").toInt)
    issues.html.labellist(getIssueLabels(repository.owner, repository.name, issueId))
  })

  ajaxPost("/:owner/:repository/issues/:id/assign")(collaboratorsOnly { repository =>
    updateAssignedUserName(repository.owner, repository.name, params("id").toInt, assignedUserName("assignedUserName"))
    Ok("updated")
  })

  ajaxPost("/:owner/:repository/issues/:id/milestone")(collaboratorsOnly { repository =>
    updateMilestoneId(repository.owner, repository.name, params("id").toInt, milestoneId("milestoneId"))
    milestoneId("milestoneId").map { milestoneId =>
      getMilestonesWithIssueCount(repository.owner, repository.name)
          .find(_._1.milestoneId == milestoneId).map { case (_, openCount, closeCount) =>
        issues.milestones.html.progress(openCount + closeCount, closeCount, false)
      } getOrElse NotFound
    } getOrElse Ok()
  })

  post("/:owner/:repository/issues/batchedit/state")(collaboratorsOnly { repository =>
    val action = params.get("value")

    executeBatch(repository) {
      handleComment(_, None, repository)( _ => action)
    }
  })

  post("/:owner/:repository/issues/batchedit/label")(collaboratorsOnly { repository =>
    val labelId = params("value").toInt

    executeBatch(repository) { issueId =>
      getIssueLabel(repository.owner, repository.name, issueId, labelId) getOrElse {
        registerIssueLabel(repository.owner, repository.name, issueId, labelId)
      }
    }
  })

  post("/:owner/:repository/issues/batchedit/assign")(collaboratorsOnly { repository =>
    val value = assignedUserName("value")

    executeBatch(repository) {
      updateAssignedUserName(repository.owner, repository.name, _, value)
    }
  })

  post("/:owner/:repository/issues/batchedit/milestone")(collaboratorsOnly { repository =>
    val value = milestoneId("value")

    executeBatch(repository) {
      updateMilestoneId(repository.owner, repository.name, _, value)
    }
  })

  val assignedUserName = (key: String) => params.get(key) filter (_.trim != "")
  val milestoneId      = (key: String) => params.get(key) collect { case x if x.trim != "" => x.toInt }

  private def isEditable(owner: String, repository: String, author: String)(implicit context: app.Context): Boolean =
    hasWritePermission(owner, repository, context.loginAccount) || author == context.loginAccount.get.userName

  private def executeBatch(repository: RepositoryService.RepositoryInfo)(execute: Int => Unit) = {
    params("checked").split(',') map(_.toInt) foreach execute
    redirect(s"/${repository.owner}/${repository.name}/issues")
  }

  /**
   * @see [[https://github.com/takezoe/gitbucket/wiki/CommentAction]]
   */
  private def handleComment(issueId: Int, content: Option[String], repository: RepositoryService.RepositoryInfo)
      (getAction: model.Issue => Option[String] =
           p1 => params.get("action").filter(_ => isEditable(p1.userName, p1.repositoryName, p1.openedUserName))) = {
    val owner    = repository.owner
    val name     = repository.name
    val userName = context.loginAccount.get.userName

    getIssue(owner, name, issueId.toString) map { issue =>
      val (action, recordActivity) =
        getAction(issue)
          .collect {
            case "close"  => true  -> (Some("close")  -> Some(recordCloseIssueActivity _))
            case "reopen" => false -> (Some("reopen") -> Some(recordReopenIssueActivity _))
          }
          .map { case (closed, t) =>
            updateClosed(owner, name, issueId, closed)
            t
          }
          .getOrElse(None -> None)

      val commentId = content
          .map       ( _ -> action.map( _ + "_comment" ).getOrElse("comment") )
          .getOrElse ( action.get.capitalize -> action.get )
          match {
            case (content, action) => createComment(owner, name, userName, issueId, content, action)
          }

      // record activity
      content foreach ( recordCommentIssueActivity(owner, name, userName, issueId, _) )
      recordActivity foreach ( _ (owner, name, userName, issueId, issue.title) )

      commentId
    }
  }

  private def searchIssues(filter: String, repository: RepositoryService.RepositoryInfo) = {
    val owner      = repository.owner
    val repoName   = repository.name
    val filterUser = Map(filter -> params.getOrElse("userName", ""))
    val page = IssueSearchCondition.page(request)
    val sessionKey = s"${owner}/${repoName}/issues"

    // retrieve search condition
    val condition = if(request.getQueryString == null){
      session.get(sessionKey).getOrElse(IssueSearchCondition()).asInstanceOf[IssueSearchCondition]
    } else IssueSearchCondition(request)

    session.put(sessionKey, condition)

    issues.html.list(
        searchIssue(condition, filterUser, (page - 1) * IssueLimit, IssueLimit, owner -> repoName),
        page,
        (getCollaborators(owner, repoName) :+ owner).sorted,
        getMilestones(owner, repoName),
        getLabels(owner, repoName),
        countIssue(condition.copy(state = "open"), filterUser, owner -> repoName),
        countIssue(condition.copy(state = "closed"), filterUser, owner -> repoName),
        countIssue(condition, Map.empty, owner -> repoName),
        context.loginAccount.map(x => countIssue(condition, Map("assigned" -> x.userName), owner -> repoName)),
        context.loginAccount.map(x => countIssue(condition, Map("created_by" -> x.userName), owner -> repoName)),
        countIssueGroupByLabels(owner, repoName, condition, filterUser),
        condition,
        filter,
        repository,
        hasWritePermission(owner, repoName, context.loginAccount))
  }

}