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package main

// Redacted release types.
//
// https://redacted.sh/wiki.php?action=article&id=455#_1804298149
//
// The API is inconsistent about whether it reports a release type as its
// numeric key or its display string, so every comparison must accept both. The
// SQL queries take an array containing *both* spellings of each disallowed type
// for the same reason.

import (
	"sort"
	"strconv"
	"strings"
)

type releaseType struct {
	IntKey    int
	StringKey string
}

var (
	releaseTypeAlbum            = releaseType{1, "Album"}
	releaseTypeSoundtrack       = releaseType{3, "Soundtrack"}
	releaseTypeEP               = releaseType{5, "EP"}
	releaseTypeAnthology        = releaseType{6, "Anthology"}
	releaseTypeCompilation      = releaseType{7, "Compilation"}
	releaseTypeSingle           = releaseType{9, "Single"}
	releaseTypeLiveAlbum        = releaseType{11, "Live album"}
	releaseTypeRemix            = releaseType{13, "Remix"}
	releaseTypeBootleg          = releaseType{14, "Bootleg"}
	releaseTypeInterview        = releaseType{15, "Interview"}
	releaseTypeMixtape          = releaseType{16, "Mixtape"}
	releaseTypeDemo             = releaseType{17, "Demo"}
	releaseTypeConcertRecording = releaseType{18, "Concert Recording"}
	releaseTypeDJMix            = releaseType{19, "DJ Mix"}
	releaseTypeUnknown          = releaseType{21, "Unknown"}
	releaseTypeProducedBy       = releaseType{1021, "Produced By"}
	releaseTypeComposition      = releaseType{1022, "Composition"}
	releaseTypeRemixedBy        = releaseType{1023, "Remixed By"}
	releaseTypeGuestAppearance  = releaseType{1024, "Guest Appearance"}
)

// allReleaseTypesSorted is in the display order used to group the torrent
// tables; the order is meaningful and is not alphabetical.
var allReleaseTypesSorted = []releaseType{
	releaseTypeAlbum,
	releaseTypeLiveAlbum,
	releaseTypeAnthology,
	releaseTypeSoundtrack,
	releaseTypeEP,
	releaseTypeCompilation,
	releaseTypeSingle,
	releaseTypeRemix,
	releaseTypeBootleg,
	releaseTypeInterview,
	releaseTypeMixtape,
	releaseTypeDemo,
	releaseTypeConcertRecording,
	releaseTypeDJMix,
	releaseTypeUnknown,
	releaseTypeProducedBy,
	releaseTypeComposition,
	releaseTypeRemixedBy,
	releaseTypeGuestAppearance,
}

// releaseTypeFromTextOrIntKey resolves either spelling.
//
// Unknown values are preserved verbatim with an IntKey of -1 rather than being
// dropped, so a newly added upstream type still displays.
func releaseTypeFromTextOrIntKey(t string) releaseType {
	for _, rt := range allReleaseTypesSorted {
		if rt.StringKey == t || strconv.Itoa(rt.IntKey) == t {
			return rt
		}
	}
	return releaseType{IntKey: -1, StringKey: t}
}

// releaseTypeSortIndex gives the position in allReleaseTypesSorted, with
// unknown types sorted last.
func releaseTypeSortIndex(rt releaseType) int {
	for i, known := range allReleaseTypesSorted {
		if known.IntKey == rt.IntKey && known.StringKey == rt.StringKey {
			return i
		}
	}
	return len(allReleaseTypesSorted)
}

// disallowedReleaseTypeStrings renders release types for the SQL comparisons,
// which test `<> ALL (...)` against a text array.
//
// Both spellings are emitted because the stored JSON may contain either.
func disallowedReleaseTypeStrings(types []releaseType) []string {
	out := make([]string, 0, len(types)*2)
	for _, rt := range types {
		out = append(out, rt.StringKey, strconv.Itoa(rt.IntKey))
	}
	return out
}

// releaseTypesOverapproximatedWithout builds the `releasetype` search parameter.
//
// The search API lets us say which release types we want, but not which we do
// not want. So we enumerate a deliberately over-wide range of ids and subtract
// the unwanted ones: new upstream types are then included automatically rather
// than silently disappearing from search results.
func releaseTypesOverapproximatedWithout(disallowed ...releaseType) string {
	excluded := map[int]bool{}
	for _, rt := range disallowed {
		excluded[rt.IntKey] = true
	}
	var ids []int
	for i := 1; i <= 50; i++ {
		if !excluded[i] {
			ids = append(ids, i)
		}
	}
	for i := 1000; i <= 1050; i++ {
		if !excluded[i] {
			ids = append(ids, i)
		}
	}
	sort.Ints(ids)
	parts := make([]string, len(ids))
	for i, id := range ids {
		parts[i] = strconv.Itoa(id)
	}
	return strings.Join(parts, ",")
}