// Copyright 2017 Gitea. 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 (
	"fmt"
	"net/http"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/repofiles"
	api "code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/routers/api/v1/utils"
)

// NewCommitStatus creates a new CommitStatus
func NewCommitStatus(ctx *context.APIContext, form api.CreateStatusOption) {
	// swagger:operation POST /repos/{owner}/{repo}/statuses/{sha} repository repoCreateStatus
	// ---
	// summary: Create a commit status
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: sha
	//   in: path
	//   description: sha of the commit
	//   type: string
	//   required: true
	// - name: body
	//   in: body
	//   schema:
	//     "$ref": "#/definitions/CreateStatusOption"
	// responses:
	//   "201":
	//     "$ref": "#/responses/Status"
	//   "400":
	//     "$ref": "#/responses/error"

	sha := ctx.Params("sha")
	if len(sha) == 0 {
		ctx.Error(http.StatusBadRequest, "sha not given", nil)
		return
	}
	status := &models.CommitStatus{
		State:       api.CommitStatusState(form.State),
		TargetURL:   form.TargetURL,
		Description: form.Description,
		Context:     form.Context,
	}
	if err := repofiles.CreateCommitStatus(ctx.Repo.Repository, ctx.User, sha, status); err != nil {
		ctx.Error(http.StatusInternalServerError, "CreateCommitStatus", err)
		return
	}

	ctx.JSON(http.StatusCreated, status.APIFormat())
}

// GetCommitStatuses returns all statuses for any given commit hash
func GetCommitStatuses(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/statuses/{sha} repository repoListStatuses
	// ---
	// summary: Get a commit's statuses
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: sha
	//   in: path
	//   description: sha of the commit
	//   type: string
	//   required: true
	// - name: sort
	//   in: query
	//   description: type of sort
	//   type: string
	//   enum: [oldest, recentupdate, leastupdate, leastindex, highestindex]
	//   required: false
	// - name: state
	//   in: query
	//   description: type of state
	//   type: string
	//   enum: [pending, success, error, failure, warning]
	//   required: false
	// - name: page
	//   in: query
	//   description: page number of results to return (1-based)
	//   type: integer
	// - name: limit
	//   in: query
	//   description: page size of results
	//   type: integer
	// responses:
	//   "200":
	//     "$ref": "#/responses/StatusList"
	//   "400":
	//     "$ref": "#/responses/error"

	getCommitStatuses(ctx, ctx.Params("sha"))
}

// GetCommitStatusesByRef returns all statuses for any given commit ref
func GetCommitStatusesByRef(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/commits/{ref}/statuses repository repoListStatusesByRef
	// ---
	// summary: Get a commit's statuses, by branch/tag/commit reference
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: ref
	//   in: path
	//   description: name of branch/tag/commit
	//   type: string
	//   required: true
	// - name: sort
	//   in: query
	//   description: type of sort
	//   type: string
	//   enum: [oldest, recentupdate, leastupdate, leastindex, highestindex]
	//   required: false
	// - name: state
	//   in: query
	//   description: type of state
	//   type: string
	//   enum: [pending, success, error, failure, warning]
	//   required: false
	// - name: page
	//   in: query
	//   description: page number of results to return (1-based)
	//   type: integer
	// - name: limit
	//   in: query
	//   description: page size of results
	//   type: integer
	// responses:
	//   "200":
	//     "$ref": "#/responses/StatusList"
	//   "400":
	//     "$ref": "#/responses/error"

	filter := ctx.Params("ref")
	if len(filter) == 0 {
		ctx.Error(http.StatusBadRequest, "ref not given", nil)
		return
	}

	for _, reftype := range []string{"heads", "tags"} { //Search branches and tags
		refSHA, lastMethodName, err := searchRefCommitByType(ctx, reftype, filter)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, lastMethodName, err)
			return
		}
		if refSHA != "" {
			filter = refSHA
			break
		}

	}

	getCommitStatuses(ctx, filter) //By default filter is maybe the raw SHA
}

func searchRefCommitByType(ctx *context.APIContext, refType, filter string) (string, string, error) {
	refs, lastMethodName, err := getGitRefs(ctx, refType+"/"+filter) //Search by type
	if err != nil {
		return "", lastMethodName, err
	}
	if len(refs) > 0 {
		return refs[0].Object.String(), "", nil //Return found SHA
	}
	return "", "", nil
}

func getCommitStatuses(ctx *context.APIContext, sha string) {
	if len(sha) == 0 {
		ctx.Error(http.StatusBadRequest, "ref/sha not given", nil)
		return
	}
	repo := ctx.Repo.Repository

	listOptions := utils.GetListOptions(ctx)

	statuses, maxResults, err := models.GetCommitStatuses(repo, sha, &models.CommitStatusOptions{
		ListOptions: listOptions,
		SortType:    ctx.QueryTrim("sort"),
		State:       ctx.QueryTrim("state"),
	})
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "GetCommitStatuses", fmt.Errorf("GetCommitStatuses[%s, %s, %d]: %v", repo.FullName(), sha, ctx.QueryInt("page"), err))
		return
	}

	apiStatuses := make([]*api.Status, 0, len(statuses))
	for _, status := range statuses {
		apiStatuses = append(apiStatuses, status.APIFormat())
	}

	ctx.SetLinkHeader(int(maxResults), listOptions.PageSize)
	ctx.Header().Set("X-Total-Count", fmt.Sprintf("%d", maxResults))
	ctx.Header().Set("Access-Control-Expose-Headers", "X-Total-Count, Link")

	ctx.JSON(http.StatusOK, apiStatuses)
}

type combinedCommitStatus struct {
	State      api.CommitStatusState `json:"state"`
	SHA        string                `json:"sha"`
	TotalCount int                   `json:"total_count"`
	Statuses   []*api.Status         `json:"statuses"`
	Repo       *api.Repository       `json:"repository"`
	CommitURL  string                `json:"commit_url"`
	URL        string                `json:"url"`
}

// GetCombinedCommitStatusByRef returns the combined status for any given commit hash
func GetCombinedCommitStatusByRef(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/commits/{ref}/statuses repository repoGetCombinedStatusByRef
	// ---
	// summary: Get a commit's combined status, by branch/tag/commit reference
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: ref
	//   in: path
	//   description: name of branch/tag/commit
	//   type: string
	//   required: true
	// - name: page
	//   in: query
	//   description: page number of results
	//   type: integer
	//   required: false
	// responses:
	//   "200":
	//     "$ref": "#/responses/Status"
	//   "400":
	//     "$ref": "#/responses/error"

	sha := ctx.Params("ref")
	if len(sha) == 0 {
		ctx.Error(http.StatusBadRequest, "ref/sha not given", nil)
		return
	}
	repo := ctx.Repo.Repository

	page := ctx.QueryInt("page")

	statuses, err := models.GetLatestCommitStatus(repo, sha, page)
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "GetLatestCommitStatus", fmt.Errorf("GetLatestCommitStatus[%s, %s, %d]: %v", repo.FullName(), sha, page, err))
		return
	}

	if len(statuses) == 0 {
		ctx.Status(http.StatusOK)
		return
	}

	retStatus := &combinedCommitStatus{
		SHA:        sha,
		TotalCount: len(statuses),
		Repo:       repo.APIFormat(ctx.Repo.AccessMode),
		URL:        "",
	}

	retStatus.Statuses = make([]*api.Status, 0, len(statuses))
	for _, status := range statuses {
		retStatus.Statuses = append(retStatus.Statuses, status.APIFormat())
		if status.State.NoBetterThan(retStatus.State) {
			retStatus.State = status.State
		}
	}

	ctx.JSON(http.StatusOK, retStatus)
}