// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package rpm

import (
	stdctx "context"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strings"

	"code.gitea.io/gitea/models/db"
	packages_model "code.gitea.io/gitea/models/packages"
	"code.gitea.io/gitea/modules/json"
	packages_module "code.gitea.io/gitea/modules/packages"
	rpm_module "code.gitea.io/gitea/modules/packages/rpm"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/util"
	"code.gitea.io/gitea/routers/api/packages/helper"
	"code.gitea.io/gitea/services/context"
	notify_service "code.gitea.io/gitea/services/notify"
	packages_service "code.gitea.io/gitea/services/packages"
	rpm_service "code.gitea.io/gitea/services/packages/rpm"
)

func apiError(ctx *context.Context, status int, obj any) {
	message := helper.ProcessErrorForUser(ctx, status, obj)
	ctx.PlainText(status, message)
}

// https://dnf.readthedocs.io/en/latest/conf_ref.html
func GetRepositoryConfig(ctx *context.Context) {
	group := ctx.PathParam("group")

	var groupParts []string
	if group != "" {
		groupParts = strings.Split(group, "/")
	}

	url := fmt.Sprintf("%sapi/packages/%s/rpm", setting.AppURL, ctx.Package.Owner.Name)

	ctx.PlainText(http.StatusOK, `[gitea-`+strings.Join(append([]string{ctx.Package.Owner.LowerName}, groupParts...), "-")+`]
name=`+strings.Join(append([]string{ctx.Package.Owner.Name, setting.AppName}, groupParts...), " - ")+`
baseurl=`+strings.Join(append([]string{url}, groupParts...), "/")+`
enabled=1
gpgcheck=1
gpgkey=`+url+`/repository.key`)
}

// Gets or creates the PGP public key used to sign repository metadata files
func GetRepositoryKey(ctx *context.Context) {
	_, pub, err := rpm_service.GetOrCreateKeyPair(ctx, ctx.Package.Owner.ID)
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}

	ctx.ServeContent(strings.NewReader(pub), &context.ServeHeaderOptions{
		ContentType: "application/pgp-keys",
		Filename:    "repository.key",
	})
}

func CheckRepositoryFileExistence(ctx *context.Context) {
	pv, err := rpm_service.GetOrCreateRepositoryVersion(ctx, ctx.Package.Owner.ID)
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}

	pf, err := packages_model.GetFileForVersionByName(ctx, pv.ID, ctx.PathParam("filename"), ctx.PathParam("group"))
	if err != nil {
		if errors.Is(err, util.ErrNotExist) {
			ctx.Status(http.StatusNotFound)
		} else {
			apiError(ctx, http.StatusInternalServerError, err)
		}
		return
	}

	ctx.SetServeHeaders(&context.ServeHeaderOptions{
		Filename:     pf.Name,
		LastModified: pf.CreatedUnix.AsLocalTime(),
	})
	ctx.Status(http.StatusOK)
}

// Gets a pre-generated repository metadata file
func GetRepositoryFile(ctx *context.Context) {
	pv, err := rpm_service.GetOrCreateRepositoryVersion(ctx, ctx.Package.Owner.ID)
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}

	s, u, pf, err := packages_service.OpenFileForDownloadByPackageVersion(
		ctx,
		pv,
		&packages_service.PackageFileInfo{
			Filename:     ctx.PathParam("filename"),
			CompositeKey: ctx.PathParam("group"),
		},
		ctx.Req.Method,
	)
	if err != nil {
		if errors.Is(err, util.ErrNotExist) {
			apiError(ctx, http.StatusNotFound, err)
		} else {
			apiError(ctx, http.StatusInternalServerError, err)
		}
		return
	}

	helper.ServePackageFile(ctx, s, u, pf)
}

func UploadPackageFile(ctx *context.Context) {
	upload, needToClose, err := ctx.UploadStream()
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}
	if needToClose {
		defer upload.Close()
	}

	buf, err := packages_module.CreateHashedBufferFromReader(upload)
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}
	defer buf.Close()

	if setting.Packages.DefaultRPMSignEnabled || ctx.FormBool("sign") {
		priv, _, err := rpm_service.GetOrCreateKeyPair(ctx, ctx.Package.Owner.ID)
		if err != nil {
			apiError(ctx, http.StatusInternalServerError, err)
			return
		}
		signedBuf, err := rpm_service.SignPackage(buf, priv)
		if err != nil {
			apiError(ctx, http.StatusBadRequest, err)
			return
		}
		defer signedBuf.Close()

		buf = signedBuf
	}

	pck, err := rpm_module.ParsePackage(buf)
	if err != nil {
		if errors.Is(err, util.ErrInvalidArgument) {
			apiError(ctx, http.StatusBadRequest, err)
		} else {
			apiError(ctx, http.StatusInternalServerError, err)
		}
		return
	}
	if _, err := buf.Seek(0, io.SeekStart); err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}

	fileMetadataRaw, err := json.Marshal(pck.FileMetadata)
	if err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}
	group := ctx.PathParam("group")
	_, _, err = packages_service.CreatePackageOrAddFileToExisting(
		ctx,
		&packages_service.PackageCreationInfo{
			PackageInfo: packages_service.PackageInfo{
				Owner:       ctx.Package.Owner,
				PackageType: packages_model.TypeRpm,
				Name:        pck.Name,
				Version:     pck.Version,
			},
			Creator:  ctx.Doer,
			Metadata: pck.VersionMetadata,
		},
		&packages_service.PackageFileCreationInfo{
			PackageFileInfo: packages_service.PackageFileInfo{
				Filename:     fmt.Sprintf("%s-%s.%s.rpm", pck.Name, pck.Version, pck.FileMetadata.Architecture),
				CompositeKey: group,
			},
			Creator: ctx.Doer,
			Data:    buf,
			IsLead:  true,
			Properties: map[string]string{
				rpm_module.PropertyGroup:        group,
				rpm_module.PropertyArchitecture: pck.FileMetadata.Architecture,
				rpm_module.PropertyMetadata:     string(fileMetadataRaw),
			},
		},
	)
	if err != nil {
		switch err {
		case packages_model.ErrDuplicatePackageVersion, packages_model.ErrDuplicatePackageFile:
			apiError(ctx, http.StatusConflict, err)
		case packages_service.ErrQuotaTotalCount, packages_service.ErrQuotaTypeSize, packages_service.ErrQuotaTotalSize:
			apiError(ctx, http.StatusForbidden, err)
		default:
			apiError(ctx, http.StatusInternalServerError, err)
		}
		return
	}

	if err := rpm_service.BuildSpecificRepositoryFiles(ctx, ctx.Package.Owner.ID, group); err != nil {
		apiError(ctx, http.StatusInternalServerError, err)
		return
	}

	ctx.Status(http.StatusCreated)
}

func DownloadPackageFile(ctx *context.Context) {
	name := ctx.PathParam("name")
	version := ctx.PathParam("version")

	s, u, pf, err := packages_service.OpenFileForDownloadByPackageNameAndVersion(
		ctx,
		&packages_service.PackageInfo{
			Owner:       ctx.Package.Owner,
			PackageType: packages_model.TypeRpm,
			Name:        name,
			Version:     version,
		},
		&packages_service.PackageFileInfo{
			Filename:     fmt.Sprintf("%s-%s.%s.rpm", name, version, ctx.PathParam("architecture")),
			CompositeKey: ctx.PathParam("group"),
		},
		ctx.Req.Method,
	)
	if err != nil {
		if errors.Is(err, util.ErrNotExist) {
			apiError(ctx, http.StatusNotFound, err)
		} else {
			apiError(ctx, http.StatusInternalServerError, err)
		}
		return
	}

	helper.ServePackageFile(ctx, s, u, pf)
}

func DeletePackageFile(webctx *context.Context) {
	group := webctx.PathParam("group")
	name := webctx.PathParam("name")
	version := webctx.PathParam("version")
	architecture := webctx.PathParam("architecture")

	var pd *packages_model.PackageDescriptor

	err := db.WithTx(webctx, func(ctx stdctx.Context) error {
		pv, err := packages_model.GetVersionByNameAndVersion(ctx,
			webctx.Package.Owner.ID,
			packages_model.TypeRpm,
			name,
			version,
		)
		if err != nil {
			return err
		}

		pf, err := packages_model.GetFileForVersionByName(
			ctx,
			pv.ID,
			fmt.Sprintf("%s-%s.%s.rpm", name, version, architecture),
			group,
		)
		if err != nil {
			return err
		}

		if err := packages_service.DeletePackageFile(ctx, pf); err != nil {
			return err
		}

		has, err := packages_model.HasVersionFileReferences(ctx, pv.ID)
		if err != nil {
			return err
		}
		if !has {
			pd, err = packages_model.GetPackageDescriptor(ctx, pv)
			if err != nil {
				return err
			}

			if err := packages_service.DeletePackageVersionAndReferences(ctx, pv); err != nil {
				return err
			}
		}

		return nil
	})
	if err != nil {
		if errors.Is(err, util.ErrNotExist) {
			apiError(webctx, http.StatusNotFound, err)
		} else {
			apiError(webctx, http.StatusInternalServerError, err)
		}
		return
	}

	if pd != nil {
		notify_service.PackageDelete(webctx, webctx.Doer, pd)
	}

	if err := rpm_service.BuildSpecificRepositoryFiles(webctx, webctx.Package.Owner.ID, group); err != nil {
		apiError(webctx, http.StatusInternalServerError, err)
		return
	}

	webctx.Status(http.StatusNoContent)
}
