// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package context

import (
	"net/http"

	auth_model "code.gitea.io/gitea/models/auth"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/models/unit"
)

// RequireRepoAdmin returns a middleware for requiring repository admin permission
func RequireRepoAdmin() func(ctx *Context) {
	return func(ctx *Context) {
		if !ctx.IsSigned || !ctx.Repo.IsAdmin() {
			ctx.NotFound("RequireRepoAdmin denies the request", nil)
			return
		}
	}
}

// CanEnableEditor checks if the user is allowed to write to the branch of the repo
func CanEnableEditor() func(ctx *Context) {
	return func(ctx *Context) {
		if !ctx.Repo.CanWriteToBranch(ctx, ctx.Doer, ctx.Repo.BranchName) {
			ctx.NotFound("CanWriteToBranch denies permission", nil)
			return
		}
	}
}

// RequireUnitWriter returns a middleware for requiring repository write to one of the unit permission
func RequireUnitWriter(unitTypes ...unit.Type) func(ctx *Context) {
	return func(ctx *Context) {
		for _, unitType := range unitTypes {
			if ctx.Repo.CanWrite(unitType) {
				return
			}
		}
		ctx.NotFound("RequireUnitWriter denies the request", nil)
	}
}

// RequireUnitReader returns a middleware for requiring repository write to one of the unit permission
func RequireUnitReader(unitTypes ...unit.Type) func(ctx *Context) {
	return func(ctx *Context) {
		for _, unitType := range unitTypes {
			if ctx.Repo.CanRead(unitType) {
				return
			}
			if unitType == unit.TypeCode && canWriteAsMaintainer(ctx) {
				return
			}
		}
		ctx.NotFound("RequireUnitReader denies the request", nil)
	}
}

// CheckRepoScopedToken check whether personal access token has repo scope
func CheckRepoScopedToken(ctx *Context, repo *repo_model.Repository, level auth_model.AccessTokenScopeLevel) {
	if !ctx.IsBasicAuth || ctx.Data["IsApiToken"] != true {
		return
	}

	scope, ok := ctx.Data["ApiTokenScope"].(auth_model.AccessTokenScope)
	if ok { // it's a personal access token but not oauth2 token
		var scopeMatched bool

		requiredScopes := auth_model.GetRequiredScopes(level, auth_model.AccessTokenScopeCategoryRepository)

		// check if scope only applies to public resources
		publicOnly, err := scope.PublicOnly()
		if err != nil {
			ctx.ServerError("HasScope", err)
			return
		}

		if publicOnly && repo.IsPrivate {
			ctx.Error(http.StatusForbidden)
			return
		}

		scopeMatched, err = scope.HasScope(requiredScopes...)
		if err != nil {
			ctx.ServerError("HasScope", err)
			return
		}

		if !scopeMatched {
			ctx.Error(http.StatusForbidden)
			return
		}
	}
}