/*
GoCheese -- Python private package repository and caching proxy
Copyright (C) 2019-2021 Sergey Matveev <stargrave@stargrave.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package main

import "strings"

const (
	MetadataFile = ".metadata.rec"

	// https://packaging.python.org/specifications/core-metadata/
	MetadataVersion                     = "2.1"
	MetadataFieldMetadataVersion        = "Metadata-Version"
	MetadataFieldName                   = "Name"
	MetadataFieldVersion                = "Version"
	MetadataFieldDescription            = "Description"
	MetadataFieldPlatform               = "Platform"
	MetadataFieldSupportedPlatform      = "Supported-Platform"
	MetadataFieldSummary                = "Summary"
	MetadataFieldDescriptionContentType = "Description-Content-Type"
	MetadataFieldKeywords               = "Keywords"
	MetadataFieldHomePage               = "Home-page"
	MetadataFieldAuthor                 = "Author"
	MetadataFieldAuthorEmail            = "Author-email"
	MetadataFieldMaintainer             = "Maintainer"
	MetadataFieldMaintainerEmail        = "Maintainer-Email"
	MetadataFieldLicense                = "License"
	MetadataFieldRequiresDist           = "Requires-Dist"
	MetadataFieldRequiresPython         = "Requires-Python"
	MetadataFieldRequiresExternal       = "Requires-External"
	MetadataFieldProjectURL             = "Project-URL"
	MetadataFieldProvidesExtra          = "Provides-Extra"
	MetadataFieldClassifier             = "Classifier"
)

func metadataFieldToRecField(f string) string {
	return strings.ReplaceAll(f, "-", "")
}

// It should follow https://www.python.org/dev/peps/pep-0566/
type PkgInfo struct {
	Name                   string   `json:"name"`
	Version                string   `json:"version"`
	Platform               []string `json:"platform,omitempty"`
	SupportedPlatform      []string `json:"supported_platform,omitempty"`
	Summary                string   `json:"summary,omitempty"`
	Description            string   `json:"description,omitempty"`
	DescriptionContentType string   `json:"description_content_type,omitempty"`
	Keywords               string   `json:"keywords,omitempty"`
	HomePage               string   `json:"home_page,omitempty"`
	Author                 string   `json:"author,omitempty"`
	AuthorEmail            string   `json:"author_email,omitempty"`
	Maintainer             string   `json:"maintainer,omitempty"`
	MaintainerEmail        string   `json:"maintainer_email,omitempty"`
	License                string   `json:"license,omitempty"`
	Classifier             []string `json:"classifier,omitempty"`
	RequiresDist           []string `json:"requires_dist,omitempty"`
	RequiresPython         string   `json:"requires_python,omitempty"`
	RequiresExternal       []string `json:"requires_external,omitempty"`
	ProjectURL             []string `json:"project_url,omitempty"`
	ProvidesExtra          []string `json:"provides_extra,omitempty"`
}

// But current PyPI does not follow PEP-0566, so just ignore some fields
type PkgInfoStripped struct {
	Name                   string   `json:"name"`
	Version                string   `json:"version"`
	Summary                string   `json:"summary,omitempty"`
	Description            string   `json:"description,omitempty"`
	DescriptionContentType string   `json:"description_content_type,omitempty"`
	Keywords               string   `json:"keywords,omitempty"`
	HomePage               string   `json:"home_page,omitempty"`
	Author                 string   `json:"author,omitempty"`
	AuthorEmail            string   `json:"author_email,omitempty"`
	Maintainer             string   `json:"maintainer,omitempty"`
	MaintainerEmail        string   `json:"maintainer_email,omitempty"`
	License                string   `json:"license,omitempty"`
	Classifier             []string `json:"classifiers,omitempty"`
	RequiresPython         string   `json:"requires_python,omitempty"`
	RequiresDist           []string `json:"requires_dist,omitempty"`
}

// Unknown format: no detailed specification available
// https://github.com/cooperlees/peps/blob/warehouse_json_api/pep-9999.rst
type PkgReleaseInfo struct {
	Filename          string `json:"filename"`
	Version           string `json:"version"`
	UploadTimeISO8601 string `json:"upload_time_iso_8601"`
	Size              int64  `json:"size"`
	HasSig            bool   `json:"has_sig"`

	Digests map[string]string `json:"digests"`
}

type PkgMeta struct {
	Info       PkgInfo                      `json:"info"`
	LastSerial int64                        `json:"last_serial"`
	Releases   map[string][]*PkgReleaseInfo `json:"releases"`
	URLs       []*PkgReleaseInfo            `json:"urls"`
}

type PkgMetaStripped struct {
	Info     PkgInfoStripped              `json:"info"`
	Releases map[string][]*PkgReleaseInfo `json:"releases"`
}