// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Commercial
// SPDX-FileCopyrightText: 2025-2026 Christian Galo

package server

import (
	"html/template"
	"strconv"

	"git.coopcloud.tech/wiki-cafe/member-console/internal/forms"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/web"
)

// The organization composite's two grant forms (spec
// plan-enrollment-administration "The composite's grant forms use
// imperative copy and help icons"; spec form-library, form-conventions;
// design D3, D8, D10). Both are dense sub-record forms on the organization
// composite: Issue grant opens from the Plan and grants card's header, one
// per page; Extend opens from a pool's delivery row, once per grant-backed
// delivery, so its render carries a Binding.Instance and a per-delivery
// WayOut (findings FA-28, FA-29, FA-32, FA-36).
//
// This file is the forms' home; the registry is only the index (design
// D1). It sits beside operator_enrollment.go, which parses through both
// declarations and never through r.FormValue.

const (
	issueGrantFormName  = "operator.enrollment.grant.issue"
	extendGrantFormName = "operator.enrollment.grant.extend"
)

// issueGrantForm is the declaration for Issue grant: any published product,
// a quantity, an optional valid_until, a reason from the operator domain,
// and a free-text description (plan-enrollment-administration "Operator
// grant issuance"). Registered at package init so the registry is complete
// for the invariants test, the route test and the registered-forms table
// whether or not a handler has been built (the pattern operator_product_
// forms.go set).
var issueGrantForm = forms.Register(forms.FormSpec{
	Name:   issueGrantFormName,
	Kind:   forms.KindSubRecord,
	Family: forms.Dense,
	Method: "POST",
	Path:   "/partials/operator/organizations/{orgID}/grant/create",
	// The whole composite re-renders: issuing a grant can change the
	// pools' delivery listing, the ledger and the tier-changes history as
	// well as the form, and a refusal must swap into the same target the
	// success does (design D9, lesson L§17). Single instance per page, so
	// no Binding.Target override is needed.
	Target: "#operator-body",
	Swap:   "innerHTML",
	Fields: []forms.Field{
		issueGrantProductField(),
		{
			Name:     "quantity",
			Label:    "Quantity",
			Control:  forms.Number,
			Optional: true,
			Min:      "1",
			Max:      strconv.Itoa(maxGrantQuantity),
			Help:     forms.Help("Quantity", "Seats, for per-seat products."),
			// A ghost example rather than a pre-filled value: the handler
			// defaults a blank submission to 1 (plan-enrollment-administration,
			// "a positive integer, defaulting to 1"), so leaving the field
			// empty is itself a valid, common choice.
			Placeholder: "1",
		},
		forms.GrantValidUntil(),
		{
			Name:    "reason",
			Label:   "Reason",
			Control: forms.Select,
			Options: issueGrantReasonOptions(),
			// An enum of one or two words: a select's third is wider than
			// any option needs.
			Width: forms.WidthNarrower,
		},
		forms.GrantNote(),
	},
	Commit: "Issue grant",
	WayOut: forms.ClosePanel("Cancel", "issueGrantPanel"),
})

// extendGrantForm is the declaration for Extend: the shared description and
// valid_until fields the issuance form carries, named and labelled alike
// (finding FA-28: Extend keeps no "reason" field; the handler records
// grant_reason "manual"; finding FA-32: one "Valid until" label on both
// forms). provision_id is hidden, because the route names only the
// organization and its pool, not the specific delivery the button rides
// (design D2's Hidden control: a parent id the route cannot itself carry).
// This declaration renders once per grant-backed delivery, so every render
// site supplies Binding.Instance and a per-delivery WayOut; the WayOut
// below is the placeholder invariants need at registration and is never
// what actually renders.
var extendGrantForm = forms.Register(forms.FormSpec{
	Name:   extendGrantFormName,
	Kind:   forms.KindSubRecord,
	Family: forms.Dense,
	Method: "POST",
	Path:   "/partials/operator/organizations/{orgID}/pools/{poolID}/grant/extend",
	Target: "#operator-body",
	Swap:   "innerHTML",
	Fields: []forms.Field{
		forms.GrantNote(),
		forms.GrantValidUntil(),
		{
			Name:     "provision_id",
			Label:    "Delivery",
			Control:  forms.Hidden,
			Optional: true,
		},
	},
	Commit: "Extend tier",
	WayOut: forms.ClosePanel("Cancel", "extendGrantPanelTemplate"),
})

// issueGrantReasonOptions is the grant-reason enum select's options: a
// disabled "Choose a reason" placeholder (spec form-conventions "A select
// that needs a choice opens with a placeholder option"), then the
// operator-selectable domain, never including 'default' (system-authored
// only) or 'trial' (superseded by 'evaluation' plus valid_until;
// plan-enrollment-administration "Operator cannot select grant_reason
// 'default'", "Time-boxed grant uses 'evaluation', never 'trial'").
func issueGrantReasonOptions() []forms.Option {
	opts := make([]forms.Option, 0, len(grantReasonDomain)+1)
	opts = append(opts, forms.ChooseOption("a reason"))
	for _, v := range grantReasonDomain {
		opts = append(opts, forms.Option{Value: v, Label: v})
	}
	return opts
}

// issuanceProductOptions builds the Product select's runtime options: a
// disabled "Choose a product" placeholder, then every issuable product,
// carrying forward the internal and supersession markers the composite
// already showed (finding FA-33 is unaddressed here; the marker's text
// equivalent is a tracked, not this lane's, fix).
func issuanceProductOptions(products []IssuanceProductOption) []forms.Option {
	opts := make([]forms.Option, 0, len(products)+1)
	opts = append(opts, forms.ChooseOption("a product"))
	for _, p := range products {
		label := p.Name
		if p.IsInternal {
			label += " [internal]"
		}
		if p.SupersedesSubscription {
			label += " ⚠"
		}
		opts = append(opts, forms.Option{Value: p.ProductID, Label: label})
	}
	return opts
}

// issueGrantProductField is the grant's product picker plus the rule-less
// warning's live region (design.md M1; plan-enrollment-administration "Issue
// grant names a product that provides nothing"), on the duplicate-name
// warning's precedent. The picker stays unfiltered and unpartitioned and the
// commit stays enabled: a set with no active rule is a state an operator may
// legitimately grant from.
func issueGrantProductField() forms.Field {
	return forms.Field{
		Name:           "product_id",
		Label:          "Product",
		Control:        forms.Select,
		RuntimeOptions: true,
		Slot:           "warning",
		Attrs: map[string]string{
			"hx-get":     "/partials/operator/products/rule-check",
			"hx-trigger": "change",
			"hx-target":  `#form-operator\.enrollment\.grant\.issue-product_id-warning`,
			"hx-swap":    "innerHTML",
		},
	}
}

// issueGrantFormOptions is the option map both the render and the parse
// read, so what the control offered and what the handler accepts are one
// list (the pattern operator_product_forms.go set for entitlement_set_id).
func issueGrantFormOptions(products []IssuanceProductOption) map[string][]forms.Option {
	return map[string][]forms.Option{"product_id": issuanceProductOptions(products)}
}

// issueGrantFormView renders the Issue grant panel: mode is ModeRecord at
// rest (bound to empty values, so a fresh open shows nothing chosen and no
// error) and ModeSubmission on a refused submission, with every submitted
// value carried back (design D9).
func issueGrantFormView(orgID string, products []IssuanceProductOption, mode forms.Mode, values forms.Values, errs *forms.Errors, warning template.HTML) forms.FormView {
	action, err := web.RouteURL(issueGrantForm.Path, orgID)
	if err != nil {
		action = issueGrantForm.Path
	}
	var slots map[string]template.HTML
	if warning != "" {
		slots = map[string]template.HTML{"product_id": warning}
	}
	return forms.Render(issueGrantForm, forms.Binding{
		Mode:    mode,
		Action:  action,
		Values:  values,
		Errors:  errs,
		Options: issueGrantFormOptions(products),
		Slots:   slots,
	})
}

// extendGrantFormView renders one delivery's Extend panel. Instance is the
// provision id, so a page with several open panels carries no duplicate DOM
// id; the way out closes exactly the panel the button that opened it named
// (design D10; findings FA-19, FA-28, FA-29, FA-32).
func extendGrantFormView(orgID, poolID, provisionID string, mode forms.Mode, values forms.Values, errs *forms.Errors) forms.FormView {
	action, err := web.RouteURL(extendGrantForm.Path, orgID, poolID)
	if err != nil {
		action = extendGrantForm.Path
	}
	return forms.Render(extendGrantForm, forms.Binding{
		Mode:     mode,
		Action:   action,
		Instance: provisionID,
		WayOut:   &forms.WayOut{Kind: forms.WayOutClosePanel, Label: "Cancel", PanelID: "extendPanel-" + provisionID},
		Values:   values,
		Errors:   errs,
	})
}

// extendGrantRestValues binds an at-rest Extend panel's one carried value:
// the delivery it extends, so the hidden field always names the right
// provision even before any submission (design D2's Hidden control).
func extendGrantRestValues(provisionID string) forms.Values {
	values := forms.NewValues()
	values.Set("provision_id", provisionID)
	return values
}