// GoCheese -- Python private package repository and caching proxy
// Copyright (C) 2019-2024 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

const (
	MDFile = ".metadata.rec"

	// https://packaging.python.org/specifications/core-metadata/
	MDVersion                     = "2.1"
	MDFieldMetadataVersion        = "Metadata-Version"
	MDFieldName                   = "Name"
	MDFieldVersion                = "Version"
	MDFieldDescription            = "Description"
	MDFieldPlatform               = "Platform"
	MDFieldSupportedPlatform      = "Supported-Platform"
	MDFieldSummary                = "Summary"
	MDFieldDescriptionContentType = "Description-Content-Type"
	MDFieldKeywords               = "Keywords"
	MDFieldHomePage               = "Home-page"
	MDFieldAuthor                 = "Author"
	MDFieldAuthorEmail            = "Author-email"
	MDFieldMaintainer             = "Maintainer"
	MDFieldMaintainerEmail        = "Maintainer-email"
	MDFieldLicense                = "License"
	MDFieldRequiresDist           = "Requires-Dist"
	MDFieldRequiresPython         = "Requires-Python"
	MDFieldRequiresExternal       = "Requires-External"
	MDFieldProjectURL             = "Project-URL"
	MDFieldProvidesExtra          = "Provides-Extra"
	MDFieldClassifier             = "Classifier"
)

var (
	MDFieldToRecField = map[string]string{
		MDFieldMetadataVersion:        "MetadataVersion",
		MDFieldName:                   "Name",
		MDFieldVersion:                "Version",
		MDFieldDescription:            "Description",
		MDFieldPlatform:               "Platform",
		MDFieldSupportedPlatform:      "SupportedPlatform",
		MDFieldSummary:                "Summary",
		MDFieldDescriptionContentType: "DescriptionContentType",
		MDFieldKeywords:               "Keywords",
		MDFieldHomePage:               "HomePage",
		MDFieldAuthor:                 "Author",
		MDFieldAuthorEmail:            "AuthorEmail",
		MDFieldMaintainer:             "Maintainer",
		MDFieldMaintainerEmail:        "MaintainerEmail",
		MDFieldLicense:                "License",
		MDFieldRequiresDist:           "RequiresDist",
		MDFieldRequiresPython:         "RequiresPython",
		MDFieldRequiresExternal:       "RequiresExternal",
		MDFieldProjectURL:             "ProjectURL",
		MDFieldProvidesExtra:          "ProvidesExtra",
		MDFieldClassifier:             "Classifier",
	}
	MDFormToRecField = [][2]string{
		{"name", MDFieldToRecField[MDFieldName]},
		{"version", MDFieldToRecField[MDFieldVersion]},
		{"platform", MDFieldToRecField[MDFieldPlatform]},
		{"supported_platform", MDFieldToRecField[MDFieldSupportedPlatform]},
		{"summary", MDFieldToRecField[MDFieldSummary]},
		{"description", MDFieldToRecField[MDFieldDescription]},
		{"description_content_type", MDFieldToRecField[MDFieldDescriptionContentType]},
		{"keywords", MDFieldToRecField[MDFieldKeywords]},
		{"home_page", MDFieldToRecField[MDFieldHomePage]},
		{"author", MDFieldToRecField[MDFieldAuthor]},
		{"author_email", MDFieldToRecField[MDFieldAuthorEmail]},
		{"maintainer", MDFieldToRecField[MDFieldMaintainer]},
		{"maintainer_email", MDFieldToRecField[MDFieldMaintainerEmail]},
		{"license", MDFieldToRecField[MDFieldLicense]},
		{"classifiers", MDFieldToRecField[MDFieldClassifier]},
		{"requires_dist", MDFieldToRecField[MDFieldRequiresDist]},
		{"requires_python", MDFieldToRecField[MDFieldRequiresPython]},
		{"requires_external", MDFieldToRecField[MDFieldRequiresExternal]},
		{"project_url", MDFieldToRecField[MDFieldProjectURL]},
		{"provides_extra", MDFieldToRecField[MDFieldProvidesExtra]},
	}
)

// 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"`
}