package web

import (
	"strings"

	"gitea.dooplex.hu/admin/felhom-controller/internal/stacks"
)

// THE LOGIN PANEL AND THE „CIM ES KULCSOK" ROWS (v0.319.0) — the settings tab's view of what was
// set at install.
//
// Until v0.318.0 the settings tab re-rendered the install wizard's form with every input disabled:
// the generated login name sat in „Automatikusan generalt ertekek" next to a disabled Domain input,
// and the password sat three sections lower among the other install answers. The household had to
// find two halves of one login. Now one panel holds the pair, and the rest are label/value rows.
//
// THE EMPTY-VALUE RULE. A field the box holds no value for is SAID, never offered an eye: the reveal
// endpoint answers 404 for it („Ehhez a mezohoz nincs mentett ertek"), which is a refusal the
// household could only meet by pressing. Measured 2026-10-16 on demo-hp: Calibre-Web was installed
// on 2026-08-21, its template gained ADMIN_PASSWORD on 2026-09-29, and InjectMissingFields never
// fills a `type: password` field — so the box never had one (audits/app-page-tuning-2026-10-16/P0).
// The page and the endpoint decide „stored" with ONE function, storedValuePresent, so the page
// cannot offer what the endpoint would refuse. Pinned by TestAppPage_NoStoredValueShowsSentence.
//
// SECRETS. A `type: secret` name and every `type: password` value stay off the page (R-254, R-709);
// only the boolean Stored reaches the template. A `type: text` name is not a secret — the old
// disabled input carried it as its value — and is shown as text.

// storedValuePresent is the one definition of „the box holds a value for this field", shared by the
// settings tab and appAutoFieldRevealHandler's 404 branch.
func storedValuePresent(val string) bool { return strings.TrimSpace(val) != "" }

// AppLoginField is one half of the login panel. Value is set ONLY for a plain-text name; a secret
// or a password never carries its value here.
type AppLoginField struct {
	EnvVar   string
	Label    string
	IsName   bool   // the name half; false for the password half
	OnDemand bool   // fetched on demand through /stacks/{name}/auto-field/reveal
	Value    string // a `type: text` name only
	Stored   bool   // the box holds a non-blank value
	Restored bool   // R-694: a restore generated it, so it is not the app's login and is never shown
}

// AppSettingRow is one label/value row of „Cim es kulcsok". An OnDemand row carries no value; the
// eye fetches it.
type AppSettingRow struct {
	EnvVar   string
	Label    string
	Value    string
	OnDemand bool
}

// loginNameSuffixes are the env-var endings the catalog uses for the name next to a password:
// ADMIN_USER + ADMIN_PASSWORD (calibre-web), ADMIN_EMAIL + ADMIN_PASSWORD (kimai),
// NEXTCLOUD_ADMIN_USER + NEXTCLOUD_ADMIN_PASSWORD, and so on — measured over the catalog on
// 2026-10-16, every pair shares the prefix.
var loginNameSuffixes = []string{"USER", "USERNAME", "EMAIL"}

// loginFieldIndexes returns, in deploy_fields order, the indexes of the login fields: every
// `type: password` field (not asked after start), each preceded by its name field when the
// template has one with the same prefix and type `secret` or `text`. A password with no clean
// pair stands alone.
func loginFieldIndexes(meta *stacks.Metadata) []int {
	if meta == nil {
		return nil
	}
	byEnv := make(map[string]int, len(meta.DeployFields))
	for i, f := range meta.DeployFields {
		byEnv[f.EnvVar] = i
	}
	var out []int
	for i, f := range meta.DeployFields {
		if f.Type != "password" || f.AfterStart {
			continue
		}
		// ADMIN_PASSWORD -> prefix "ADMIN_" -> ADMIN_USER / ADMIN_USERNAME / ADMIN_EMAIL.
		prefix := strings.TrimSuffix(f.EnvVar, "PASSWORD")
		if prefix != f.EnvVar {
			for _, suf := range loginNameSuffixes {
				if j, ok := byEnv[prefix+suf]; ok {
					if t := meta.DeployFields[j].Type; (t == "secret" || t == "text") && !meta.DeployFields[j].AfterStart {
						out = append(out, j)
						break
					}
				}
			}
		}
		out = append(out, i)
	}
	return out
}

// appLoginFields builds the panel from the DECRYPTED env (before any value is removed from it).
func appLoginFields(meta *stacks.Metadata, env map[string]string, restored map[string]bool) []AppLoginField {
	var out []AppLoginField
	for _, i := range loginFieldIndexes(meta) {
		f := meta.DeployFields[i]
		lf := AppLoginField{EnvVar: f.EnvVar, Label: f.Label, IsName: true, Stored: storedValuePresent(env[f.EnvVar])}
		switch f.Type {
		case "password":
			lf.IsName, lf.OnDemand, lf.Restored = false, true, restored[f.EnvVar]
		case "secret":
			lf.OnDemand = true
		default:
			lf.Value = env[f.EnvVar]
		}
		out = append(out, lf)
	}
	return out
}

// appSettingRows is everything else an installed app was given at install, as rows: the generated
// secrets (eye) and the plain answers (text). Skipped, because the page says them elsewhere: the
// domain and the subdomain (the „Cim" row), the data folder (the „Tarhely" row), the login fields
// (the login panel), and a field asked after start (its own card).
func appSettingRows(meta *stacks.Metadata, env map[string]string, yes, no string) []AppSettingRow {
	if meta == nil {
		return nil
	}
	login := map[int]bool{}
	for _, i := range loginFieldIndexes(meta) {
		login[i] = true
	}
	var out []AppSettingRow
	for i, f := range meta.DeployFields {
		if login[i] || f.AfterStart {
			continue
		}
		val := env[f.EnvVar]
		switch f.Type {
		case "domain", "subdomain", "path", "password":
			continue
		case "secret":
			if storedValuePresent(val) {
				out = append(out, AppSettingRow{EnvVar: f.EnvVar, Label: f.Label, OnDemand: true})
			}
			continue
		case "select":
			for _, o := range f.Options {
				if o.Value == val {
					val = o.Label
					break
				}
			}
		case "boolean":
			if val == "true" {
				val = yes
			} else {
				val = no
			}
		}
		if !storedValuePresent(val) {
			continue
		}
		out = append(out, AppSettingRow{EnvVar: f.EnvVar, Label: f.Label, Value: val})
	}
	return out
}

// THE LOGIN ANSWER (v0.320.0) — every installed app's settings tab says where its login is, in ONE panel with ONE
// answer. The box can show a password only if it knows it, so the answers are, in this order:
//
//	fields       a `type: password` field (and its name): the value fetched on demand, or — when the box holds none —
//	             the v0.319.0 sentence (the empty-value rule above)
//	initial      the app wrote a login at its first start and the box reads it (InitialCreds); FileBrowser's own
//	             (R-513) is this answer too, and in its `operator` state it is a sentence and the „new password" press
//	first_visit  the household makes the admin on the first visit — the catalog's app_info.login_kind, default
//	email        the app signs in by an e-mailed link
//	none         the app has no sign-in
//
// An infra stack with no login of its own (traefik, cloudflared, samba) gets no panel: it is not an app anyone signs
// into. Pinned by TestAppPage_EveryInstalledAppHasOneLoginAnswer.
const (
	loginAnswerFields  = "fields"
	loginAnswerInitial = "initial"
)

// loginAnswerFor picks the answer from the page data the tab already assembled ("" = no panel).
func loginAnswerFor(data map[string]interface{}, meta *stacks.Metadata) string {
	if f, _ := data["LoginFields"].([]AppLoginField); len(f) > 0 {
		return loginAnswerFields
	}
	if ic, _ := data["InitialCreds"].(*stacks.ExtractedCreds); ic != nil {
		return loginAnswerInitial
	}
	if infra, _ := data["Infra"].(bool); infra || meta == nil {
		return ""
	}
	return meta.AppInfo.EffectiveLoginKind()
}