// Copyright 2015 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 v1 Gitea API.
//
// This documentation describes the Gitea API.
//
//     Schemes: http, https
//     BasePath: /api/v1
//     Version: 1.1.1
//     License: MIT http://opensource.org/licenses/MIT
//
//     Consumes:
//     - application/json
//     - text/plain
//
//     Produces:
//     - application/json
//     - text/html
//
//     Security:
//     - BasicAuth :
//     - Token :
//     - AccessToken :
//     - AuthorizationHeaderToken :
//
//     SecurityDefinitions:
//     BasicAuth:
//          type: basic
//     Token:
//          type: apiKey
//          name: token
//          in: query
//     AccessToken:
//          type: apiKey
//          name: access_token
//          in: query
//     AuthorizationHeaderToken:
//          type: apiKey
//          name: Authorization
//          in: header
//
// swagger:meta
package v1

import (
	"strings"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/auth"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/routers/api/v1/admin"
	"code.gitea.io/gitea/routers/api/v1/misc"
	"code.gitea.io/gitea/routers/api/v1/org"
	"code.gitea.io/gitea/routers/api/v1/repo"
	_ "code.gitea.io/gitea/routers/api/v1/swagger" // for swagger generation
	"code.gitea.io/gitea/routers/api/v1/user"
	"code.gitea.io/gitea/routers/api/v1/utils"
	api "code.gitea.io/sdk/gitea"

	"github.com/go-macaron/binding"
	"gopkg.in/macaron.v1"
)

func repoAssignment() macaron.Handler {
	return func(ctx *context.APIContext) {
		userName := ctx.Params(":username")
		repoName := ctx.Params(":reponame")

		var (
			owner *models.User
			err   error
		)

		// Check if the user is the same as the repository owner.
		if ctx.IsSigned && ctx.User.LowerName == strings.ToLower(userName) {
			owner = ctx.User
		} else {
			owner, err = models.GetUserByName(userName)
			if err != nil {
				if models.IsErrUserNotExist(err) {
					ctx.Status(404)
				} else {
					ctx.Error(500, "GetUserByName", err)
				}
				return
			}
		}
		ctx.Repo.Owner = owner

		// Get repository.
		repo, err := models.GetRepositoryByName(owner.ID, repoName)
		if err != nil {
			if models.IsErrRepoNotExist(err) {
				redirectRepoID, err := models.LookupRepoRedirect(owner.ID, repoName)
				if err == nil {
					context.RedirectToRepo(ctx.Context, redirectRepoID)
				} else if models.IsErrRepoRedirectNotExist(err) {
					ctx.Status(404)
				} else {
					ctx.Error(500, "LookupRepoRedirect", err)
				}
			} else {
				ctx.Error(500, "GetRepositoryByName", err)
			}
			return
		}
		repo.Owner = owner

		if ctx.IsSigned && ctx.User.IsAdmin {
			ctx.Repo.AccessMode = models.AccessModeOwner
		} else {
			mode, err := models.AccessLevel(utils.UserID(ctx), repo)
			if err != nil {
				ctx.Error(500, "AccessLevel", err)
				return
			}
			ctx.Repo.AccessMode = mode
		}

		if !ctx.Repo.HasAccess() {
			ctx.Status(404)
			return
		}

		ctx.Repo.Repository = repo
	}
}

// Contexter middleware already checks token for user sign in process.
func reqToken() macaron.Handler {
	return func(ctx *context.Context) {
		if !ctx.IsSigned {
			ctx.Error(401)
			return
		}
	}
}

func reqBasicAuth() macaron.Handler {
	return func(ctx *context.Context) {
		if !ctx.IsBasicAuth {
			ctx.Error(401)
			return
		}
	}
}

func reqAdmin() macaron.Handler {
	return func(ctx *context.Context) {
		if !ctx.IsSigned || !ctx.User.IsAdmin {
			ctx.Error(403)
			return
		}
	}
}

func reqRepoWriter() macaron.Handler {
	return func(ctx *context.Context) {
		if !ctx.Repo.IsWriter() {
			ctx.Error(403)
			return
		}
	}
}

func reqOrgMembership() macaron.Handler {
	return func(ctx *context.APIContext) {
		var orgID int64
		if ctx.Org.Organization != nil {
			orgID = ctx.Org.Organization.ID
		} else if ctx.Org.Team != nil {
			orgID = ctx.Org.Team.OrgID
		} else {
			ctx.Error(500, "", "reqOrgMembership: unprepared context")
			return
		}

		if isMember, err := models.IsOrganizationMember(orgID, ctx.User.ID); err != nil {
			ctx.Error(500, "IsOrganizationMember", err)
			return
		} else if !isMember {
			if ctx.Org.Organization != nil {
				ctx.Error(403, "", "Must be an organization member")
			} else {
				ctx.Status(404)
			}
			return
		}
	}
}

func reqOrgOwnership() macaron.Handler {
	return func(ctx *context.APIContext) {
		var orgID int64
		if ctx.Org.Organization != nil {
			orgID = ctx.Org.Organization.ID
		} else if ctx.Org.Team != nil {
			orgID = ctx.Org.Team.OrgID
		} else {
			ctx.Error(500, "", "reqOrgOwnership: unprepared context")
			return
		}

		isOwner, err := models.IsOrganizationOwner(orgID, ctx.User.ID)
		if err != nil {
			ctx.Error(500, "IsOrganizationOwner", err)
		} else if !isOwner {
			if ctx.Org.Organization != nil {
				ctx.Error(403, "", "Must be an organization owner")
			} else {
				ctx.Status(404)
			}
			return
		}
	}
}

func orgAssignment(args ...bool) macaron.Handler {
	var (
		assignOrg  bool
		assignTeam bool
	)
	if len(args) > 0 {
		assignOrg = args[0]
	}
	if len(args) > 1 {
		assignTeam = args[1]
	}
	return func(ctx *context.APIContext) {
		ctx.Org = new(context.APIOrganization)

		var err error
		if assignOrg {
			ctx.Org.Organization, err = models.GetOrgByName(ctx.Params(":orgname"))
			if err != nil {
				if models.IsErrOrgNotExist(err) {
					ctx.Status(404)
				} else {
					ctx.Error(500, "GetOrgByName", err)
				}
				return
			}
		}

		if assignTeam {
			ctx.Org.Team, err = models.GetTeamByID(ctx.ParamsInt64(":teamid"))
			if err != nil {
				if models.IsErrUserNotExist(err) {
					ctx.Status(404)
				} else {
					ctx.Error(500, "GetTeamById", err)
				}
				return
			}
		}
	}
}

func mustEnableIssues(ctx *context.APIContext) {
	if !ctx.Repo.Repository.UnitEnabled(models.UnitTypeIssues) {
		ctx.Status(404)
		return
	}
}

func mustAllowPulls(ctx *context.Context) {
	if !ctx.Repo.Repository.AllowsPulls() {
		ctx.Status(404)
		return
	}
}

func mustEnableIssuesOrPulls(ctx *context.Context) {
	if !ctx.Repo.Repository.UnitEnabled(models.UnitTypeIssues) &&
		!ctx.Repo.Repository.AllowsPulls() {
		ctx.Status(404)
		return
	}
}

// RegisterRoutes registers all v1 APIs routes to web application.
// FIXME: custom form error response
func RegisterRoutes(m *macaron.Macaron) {
	bind := binding.Bind

	if setting.API.EnableSwaggerEndpoint {
		m.Get("/swagger", misc.Swagger) //Render V1 by default
	}

	m.Group("/v1", func() {
		// Miscellaneous
		if setting.API.EnableSwaggerEndpoint {
			m.Get("/swagger", misc.Swagger)
		}
		m.Get("/version", misc.Version)
		m.Post("/markdown", bind(api.MarkdownOption{}), misc.Markdown)
		m.Post("/markdown/raw", misc.MarkdownRaw)

		// Users
		m.Group("/users", func() {
			m.Get("/search", user.Search)

			m.Group("/:username", func() {
				m.Get("", user.GetInfo)

				m.Get("/repos", user.ListUserRepos)
				m.Group("/tokens", func() {
					m.Combo("").Get(user.ListAccessTokens).
						Post(bind(api.CreateAccessTokenOption{}), user.CreateAccessToken)
				}, reqBasicAuth())
			})
		})

		m.Group("/users", func() {
			m.Group("/:username", func() {
				m.Get("/keys", user.ListPublicKeys)
				m.Get("/gpg_keys", user.ListGPGKeys)

				m.Get("/followers", user.ListFollowers)
				m.Group("/following", func() {
					m.Get("", user.ListFollowing)
					m.Get("/:target", user.CheckFollowing)
				})

				m.Get("/starred", user.GetStarredRepos)

				m.Get("/subscriptions", user.GetWatchedRepos)
			})
		}, reqToken())

		m.Group("/user", func() {
			m.Get("", user.GetAuthenticatedUser)
			m.Combo("/emails").Get(user.ListEmails).
				Post(bind(api.CreateEmailOption{}), user.AddEmail).
				Delete(bind(api.DeleteEmailOption{}), user.DeleteEmail)

			m.Get("/followers", user.ListMyFollowers)
			m.Group("/following", func() {
				m.Get("", user.ListMyFollowing)
				m.Combo("/:username").Get(user.CheckMyFollowing).Put(user.Follow).Delete(user.Unfollow)
			})

			m.Group("/keys", func() {
				m.Combo("").Get(user.ListMyPublicKeys).
					Post(bind(api.CreateKeyOption{}), user.CreatePublicKey)
				m.Combo("/:id").Get(user.GetPublicKey).
					Delete(user.DeletePublicKey)
			})

			m.Group("/gpg_keys", func() {
				m.Combo("").Get(user.ListMyGPGKeys).
					Post(bind(api.CreateGPGKeyOption{}), user.CreateGPGKey)
				m.Combo("/:id").Get(user.GetGPGKey).
					Delete(user.DeleteGPGKey)
			})

			m.Combo("/repos").Get(user.ListMyRepos).
				Post(bind(api.CreateRepoOption{}), repo.Create)

			m.Group("/starred", func() {
				m.Get("", user.GetMyStarredRepos)
				m.Group("/:username/:reponame", func() {
					m.Get("", user.IsStarring)
					m.Put("", user.Star)
					m.Delete("", user.Unstar)
				}, repoAssignment())
			})
			m.Get("/times", repo.ListMyTrackedTimes)

			m.Get("/subscriptions", user.GetMyWatchedRepos)
		}, reqToken())

		// Repositories
		m.Post("/org/:org/repos", reqToken(), bind(api.CreateRepoOption{}), repo.CreateOrgRepo)

		m.Group("/repos", func() {
			m.Get("/search", repo.Search)
		})

		m.Combo("/repositories/:id", reqToken()).Get(repo.GetByID)

		m.Group("/repos", func() {
			m.Post("/migrate", reqToken(), bind(auth.MigrateRepoForm{}), repo.Migrate)

			m.Group("/:username/:reponame", func() {
				m.Combo("").Get(repo.Get).Delete(reqToken(), repo.Delete)
				m.Group("/hooks", func() {
					m.Combo("").Get(repo.ListHooks).
						Post(bind(api.CreateHookOption{}), repo.CreateHook)
					m.Group("/:id", func() {
						m.Combo("").Get(repo.GetHook).
							Patch(bind(api.EditHookOption{}), repo.EditHook).
							Delete(repo.DeleteHook)
						m.Post("/tests", context.RepoRef(), repo.TestHook)
					})
				}, reqToken(), reqRepoWriter())
				m.Group("/collaborators", func() {
					m.Get("", repo.ListCollaborators)
					m.Combo("/:collaborator").Get(repo.IsCollaborator).
						Put(bind(api.AddCollaboratorOption{}), repo.AddCollaborator).
						Delete(repo.DeleteCollaborator)
				}, reqToken())
				m.Get("/raw/*", context.RepoRefByType(context.RepoRefAny), repo.GetRawFile)
				m.Get("/archive/*", repo.GetArchive)
				m.Combo("/forks").Get(repo.ListForks).
					Post(reqToken(), bind(api.CreateForkOption{}), repo.CreateFork)
				m.Group("/branches", func() {
					m.Get("", repo.ListBranches)
					m.Get("/*", context.RepoRefByType(context.RepoRefBranch), repo.GetBranch)
				})
				m.Group("/keys", func() {
					m.Combo("").Get(repo.ListDeployKeys).
						Post(bind(api.CreateKeyOption{}), repo.CreateDeployKey)
					m.Combo("/:id").Get(repo.GetDeployKey).
						Delete(repo.DeleteDeploykey)
				}, reqToken(), reqRepoWriter())
				m.Group("/times", func() {
					m.Combo("").Get(repo.ListTrackedTimesByRepository)
					m.Combo("/:timetrackingusername").Get(repo.ListTrackedTimesByUser)

				}, mustEnableIssues)
				m.Group("/issues", func() {
					m.Combo("").Get(repo.ListIssues).
						Post(reqToken(), bind(api.CreateIssueOption{}), repo.CreateIssue)
					m.Group("/comments", func() {
						m.Get("", repo.ListRepoIssueComments)
						m.Combo("/:id", reqToken()).
							Patch(bind(api.EditIssueCommentOption{}), repo.EditIssueComment).
							Delete(repo.DeleteIssueComment)
					})
					m.Group("/:index", func() {
						m.Combo("").Get(repo.GetIssue).
							Patch(reqToken(), bind(api.EditIssueOption{}), repo.EditIssue)

						m.Group("/comments", func() {
							m.Combo("").Get(repo.ListIssueComments).
								Post(reqToken(), bind(api.CreateIssueCommentOption{}), repo.CreateIssueComment)
							m.Combo("/:id", reqToken()).Patch(bind(api.EditIssueCommentOption{}), repo.EditIssueCommentDeprecated).
								Delete(repo.DeleteIssueCommentDeprecated)
						})

						m.Group("/labels", func() {
							m.Combo("").Get(repo.ListIssueLabels).
								Post(reqToken(), bind(api.IssueLabelsOption{}), repo.AddIssueLabels).
								Put(reqToken(), bind(api.IssueLabelsOption{}), repo.ReplaceIssueLabels).
								Delete(reqToken(), repo.ClearIssueLabels)
							m.Delete("/:id", reqToken(), repo.DeleteIssueLabel)
						})

						m.Group("/times", func() {
							m.Combo("").Get(repo.ListTrackedTimes).
								Post(reqToken(), bind(api.AddTimeOption{}), repo.AddTime)
						})
					})
				}, mustEnableIssuesOrPulls)
				m.Group("/labels", func() {
					m.Combo("").Get(repo.ListLabels).
						Post(reqToken(), bind(api.CreateLabelOption{}), repo.CreateLabel)
					m.Combo("/:id").Get(repo.GetLabel).
						Patch(reqToken(), bind(api.EditLabelOption{}), repo.EditLabel).
						Delete(reqToken(), repo.DeleteLabel)
				})
				m.Group("/milestones", func() {
					m.Combo("").Get(repo.ListMilestones).
						Post(reqToken(), reqRepoWriter(), bind(api.CreateMilestoneOption{}), repo.CreateMilestone)
					m.Combo("/:id").Get(repo.GetMilestone).
						Patch(reqToken(), reqRepoWriter(), bind(api.EditMilestoneOption{}), repo.EditMilestone).
						Delete(reqToken(), reqRepoWriter(), repo.DeleteMilestone)
				})
				m.Get("/stargazers", repo.ListStargazers)
				m.Get("/subscribers", repo.ListSubscribers)
				m.Group("/subscription", func() {
					m.Get("", user.IsWatching)
					m.Put("", reqToken(), user.Watch)
					m.Delete("", reqToken(), user.Unwatch)
				})
				m.Group("/releases", func() {
					m.Combo("").Get(repo.ListReleases).
						Post(reqToken(), reqRepoWriter(), context.ReferencesGitRepo(), bind(api.CreateReleaseOption{}), repo.CreateRelease)
					m.Group("/:id", func() {
						m.Combo("").Get(repo.GetRelease).
							Patch(reqToken(), reqRepoWriter(), context.ReferencesGitRepo(), bind(api.EditReleaseOption{}), repo.EditRelease).
							Delete(reqToken(), reqRepoWriter(), repo.DeleteRelease)
						m.Group("/assets", func() {
							m.Combo("").Get(repo.ListReleaseAttachments).
								Post(reqToken(), reqRepoWriter(), repo.CreateReleaseAttachment)
							m.Combo("/:asset").Get(repo.GetReleaseAttachment).
								Patch(reqToken(), reqRepoWriter(), bind(api.EditAttachmentOptions{}), repo.EditReleaseAttachment).
								Delete(reqToken(), reqRepoWriter(), repo.DeleteReleaseAttachment)
						})
					})
				})
				m.Post("/mirror-sync", reqToken(), reqRepoWriter(), repo.MirrorSync)
				m.Get("/editorconfig/:filename", context.RepoRef(), repo.GetEditorconfig)
				m.Group("/pulls", func() {
					m.Combo("").Get(bind(api.ListPullRequestsOptions{}), repo.ListPullRequests).
						Post(reqToken(), reqRepoWriter(), bind(api.CreatePullRequestOption{}), repo.CreatePullRequest)
					m.Group("/:index", func() {
						m.Combo("").Get(repo.GetPullRequest).
							Patch(reqToken(), reqRepoWriter(), bind(api.EditPullRequestOption{}), repo.EditPullRequest)
						m.Combo("/merge").Get(repo.IsPullRequestMerged).
							Post(reqToken(), reqRepoWriter(), bind(auth.MergePullRequestForm{}), repo.MergePullRequest)
					})

				}, mustAllowPulls, context.ReferencesGitRepo())
				m.Group("/statuses", func() {
					m.Combo("/:sha").Get(repo.GetCommitStatuses).
						Post(reqToken(), reqRepoWriter(), bind(api.CreateStatusOption{}), repo.NewCommitStatus)
				})
				m.Group("/commits/:ref", func() {
					m.Get("/status", repo.GetCombinedCommitStatusByRef)
					m.Get("/statuses", repo.GetCommitStatusesByRef)
				})
			}, repoAssignment())
		})

		// Organizations
		m.Get("/user/orgs", reqToken(), org.ListMyOrgs)
		m.Get("/users/:username/orgs", org.ListUserOrgs)
		m.Group("/orgs/:orgname", func() {
			m.Get("/repos", user.ListOrgRepos)
			m.Combo("").Get(org.Get).
				Patch(reqToken(), reqOrgOwnership(), bind(api.EditOrgOption{}), org.Edit)
			m.Group("/members", func() {
				m.Get("", org.ListMembers)
				m.Combo("/:username").Get(org.IsMember).
					Delete(reqToken(), reqOrgOwnership(), org.DeleteMember)
			})
			m.Group("/public_members", func() {
				m.Get("", org.ListPublicMembers)
				m.Combo("/:username").Get(org.IsPublicMember).
					Put(reqToken(), reqOrgMembership(), org.PublicizeMember).
					Delete(reqToken(), reqOrgMembership(), org.ConcealMember)
			})
			m.Combo("/teams", reqToken(), reqOrgMembership()).Get(org.ListTeams).
				Post(bind(api.CreateTeamOption{}), org.CreateTeam)
			m.Group("/hooks", func() {
				m.Combo("").Get(org.ListHooks).
					Post(bind(api.CreateHookOption{}), org.CreateHook)
				m.Combo("/:id").Get(org.GetHook).
					Patch(reqOrgOwnership(), bind(api.EditHookOption{}), org.EditHook).
					Delete(reqOrgOwnership(), org.DeleteHook)
			}, reqToken(), reqOrgMembership())
		}, orgAssignment(true))
		m.Group("/teams/:teamid", func() {
			m.Combo("").Get(org.GetTeam).
				Patch(reqOrgOwnership(), bind(api.EditTeamOption{}), org.EditTeam).
				Delete(reqOrgOwnership(), org.DeleteTeam)
			m.Group("/members", func() {
				m.Get("", org.GetTeamMembers)
				m.Combo("/:username").
					Put(reqOrgOwnership(), org.AddTeamMember).
					Delete(reqOrgOwnership(), org.RemoveTeamMember)
			})
			m.Group("/repos", func() {
				m.Get("", org.GetTeamRepos)
				m.Combo("/:orgname/:reponame").
					Put(org.AddTeamRepository).
					Delete(org.RemoveTeamRepository)
			})
		}, orgAssignment(false, true), reqToken(), reqOrgMembership())

		m.Any("/*", func(ctx *context.Context) {
			ctx.Error(404)
		})

		m.Group("/admin", func() {
			m.Group("/users", func() {
				m.Post("", bind(api.CreateUserOption{}), admin.CreateUser)
				m.Group("/:username", func() {
					m.Combo("").Patch(bind(api.EditUserOption{}), admin.EditUser).
						Delete(admin.DeleteUser)
					m.Group("/keys", func() {
						m.Post("", bind(api.CreateKeyOption{}), admin.CreatePublicKey)
						m.Delete("/:id", admin.DeleteUserPublicKey)
					})
					m.Post("/orgs", bind(api.CreateOrgOption{}), admin.CreateOrg)
					m.Post("/repos", bind(api.CreateRepoOption{}), admin.CreateRepo)
				})
			})
		}, reqAdmin())

		m.Group("/topics", func() {
			m.Get("/search", repo.TopicSearch)
		})
	}, context.APIContexter())
}