package templates

import (
	"backend/internal/auth"
	"backend/internal/db/sqlc"
	"backend/internal/web/ui"
)

// TablosDashboard renders the root authenticated dashboard: heading, "New tablo"
// button, create-form slot, and the list of tablo cards (or empty state).
// UI-SPEC §1 Interaction Contract — GET /.
templ TablosDashboard(user *auth.User, csrfToken string, tablos []TabloCardView) {
	@Layout("Tablos — Xtablo", user, csrfToken) {
		<div class="flex items-center justify-between mb-6">
			<h1 class="text-[28px] font-semibold leading-tight">Your Tablos</h1>
			@ui.Button(ui.ButtonProps{
				Label:   "New tablo",
				Variant: ui.ButtonVariantDefault,
				Tone:    ui.ButtonToneSolid,
				Size:    ui.SizeMD,
				Type:    "button",
				Attrs: templ.Attributes{
					"hx-get":    "/tablos/new",
					"hx-target": "#create-form-slot",
					"hx-swap":   "innerHTML",
				},
			})
		</div>
		<div id="create-form-slot"></div>
		<div id="tablos-list">
			if len(tablos) == 0 {
				@TablosEmptyState()
			} else {
				for _, tablo := range tablos {
					@TabloCard(tablo, csrfToken)
				}
			}
		</div>
	}
}

// TablosEmptyState renders the empty-state copy when a user has no tablos.
// Copy strings are locked by UI-SPEC Copywriting Contract.
templ TablosEmptyState() {
	<div class="text-center py-16">
		<h2 class="text-xl font-semibold leading-snug text-slate-800">No tablos yet</h2>
		<p class="mt-2 text-base text-slate-600">Create your first tablo to get started.</p>
		<div class="mt-6">
			@ui.Button(ui.ButtonProps{
				Label:   "New tablo",
				Variant: ui.ButtonVariantDefault,
				Tone:    ui.ButtonToneSolid,
				Size:    ui.SizeMD,
				Type:    "button",
				Attrs: templ.Attributes{
					"hx-get":    "/tablos/new",
					"hx-target": "#create-form-slot",
					"hx-swap":   "innerHTML",
					"aria-label": "Create your first tablo",
				},
			})
		</div>
	</div>
}

// TabloCard renders a single tablo as a ui.Card on the dashboard.
// Guards description and color rendering against null pgtype.Text values (Pitfall 6).
// Delegates delete-zone rendering to TabloDeleteButtonFragment (single source of truth).
templ TabloCard(card TabloCardView, csrfToken string) {
	<div id={ "tablo-" + card.Tablo.ID.String() }>
		@ui.Card(ui.CardProps{Body: tabloCardBody(card, csrfToken)})
	</div>
}

templ tabloCardBody(card TabloCardView, csrfToken string) {
	<div class="flex items-start justify-between">
		<div>
			<div class="flex flex-wrap items-center gap-2">
				<h2 class="text-xl font-semibold leading-snug">{ card.Tablo.Title }</h2>
				@DiscussionUnreadBadge(card.DiscussionUnreadCount)
			</div>
			if card.Tablo.Description.Valid && card.Tablo.Description.String != "" {
				<p class="mt-2 text-base text-slate-600">{ card.Tablo.Description.String }</p>
			}
			if card.Tablo.Color.Valid && card.Tablo.Color.String != "" {
				<div class="mt-2 flex items-center gap-2">
					<span
						class="inline-block w-2.5 h-2.5 rounded-full"
						style={ "background-color: " + card.Tablo.Color.String }
					></span>
					<span class="text-sm text-slate-500">{ card.Tablo.Color.String }</span>
				</div>
			}
		</div>
		@TabloDeleteButtonFragment(card.Tablo, csrfToken)
	</div>
	<div class="mt-4">
		<a href={ templ.SafeURL("/tablos/" + card.Tablo.ID.String()) } class="text-sm font-medium text-blue-600 hover:underline">View</a>
	</div>
}

templ DiscussionUnreadBadge(count int64) {
	if count > 0 {
		<span class="inline-flex min-w-6 items-center justify-center rounded-full border border-blue-200 bg-slate-50 px-2 py-0.5 text-xs font-semibold leading-none text-blue-700" aria-label={ DiscussionUnreadAriaLabel(count) }>{ DiscussionUnreadDisplay(count) }</span>
	}
}

// TabloCreateFormFragment renders the inline create form loaded into #create-form-slot
// via HTMX. Falls back to a plain POST /tablos for non-JS paths.
// UI-SPEC §2 Interaction Contract — GET /tablos/new + POST /tablos.
templ TabloCreateFormFragment(form TabloCreateForm, errs TabloCreateErrors, csrfToken string) {
	<form
		id="create-form"
		method="POST"
		action="/tablos"
		hx-post="/tablos"
		hx-target="#create-form-slot"
		hx-swap="innerHTML"
		class="mb-6 space-y-4 rounded border border-slate-200 bg-slate-50 p-6"
	>
		@ui.CSRFField(csrfToken)
		@GeneralError(errs.General)
		<h2 class="text-xl font-semibold leading-snug">Create a tablo</h2>
		<div>
			<label for="title" class="block text-sm font-medium text-slate-700">Title</label>
			<input
				id="title"
				type="text"
				name="title"
				value={ form.Title }
				required
				class="mt-1 block w-full rounded border border-slate-300 px-3 py-2 text-sm placeholder-slate-400 focus:border-slate-500 focus:outline-none"
				placeholder="My tablo"
			/>
			@FieldError(errs.Title)
		</div>
		<div>
			<label for="description" class="block text-sm font-medium text-slate-700">Description <span class="text-slate-400">(optional)</span></label>
			<textarea
				id="description"
				name="description"
				rows="3"
				class="mt-1 block w-full rounded border border-slate-300 px-3 py-2 text-sm placeholder-slate-400 focus:border-slate-500 focus:outline-none"
				placeholder="What is this tablo for?"
			>{ form.Description }</textarea>
		</div>
		<div>
			<label for="color" class="block text-sm font-medium text-slate-700">Color <span class="text-slate-400">(optional)</span></label>
			<input
				id="color"
				type="text"
				name="color"
				value={ form.Color }
				class="mt-1 block w-full rounded border border-slate-300 px-3 py-2 text-sm placeholder-slate-400 focus:border-slate-500 focus:outline-none"
				placeholder="#6366f1"
			/>
			@FieldError(errs.Color)
		</div>
		<div class="flex items-center gap-3">
			@ui.Button(ui.ButtonProps{
				Label:   "Create tablo",
				Variant: ui.ButtonVariantDefault,
				Tone:    ui.ButtonToneSolid,
				Size:    ui.SizeMD,
				Type:    "submit",
			})
			<a href="/" class="text-sm text-slate-600 hover:underline">Cancel</a>
		</div>
	</form>
}

// TabloCardWithOOBFormClear renders a TabloCard as the primary swap target
// AND an OOB element that clears #create-form-slot in the same response.
// The OOB div MUST be a top-level sibling of TabloCard — NOT nested (Pitfall 5).
// HTMX applies the primary swap (HX-Retarget: #tablos-list, afterbegin) AND
// the OOB swap (#create-form-slot → empty) from a single response.
templ TabloCardWithOOBFormClear(tablo sqlc.Tablo, csrfToken string) {
	@TabloCard(TabloCardFromTablo(tablo), csrfToken)
	<div id="create-form-slot" hx-swap-oob="true"></div>
}

// TabloDetailPage renders the full detail page for a single tablo with a 3-tab layout.
// Tabs: Overview / Tasks / Files. activeTab selects the initially rendered tab content.
// files and tasks are pre-fetched slices for the active tab (may be nil for inactive tabs).
// UI-SPEC §3 Interaction Contract — GET /tablos/{id}.
// D-07: signature includes activeTab string param; D-08: tab bar links carry hx-push-url.
templ TabloDetailPage(user *auth.User, csrfToken string, tablo sqlc.Tablo, tasks []sqlc.Task, etapes []sqlc.Etape, counts EtapeTaskCounts, filter EtapeFilter, files []sqlc.TabloFile, events EventsCalendar, discussion DiscussionTabData, activeTab string) {
	@Layout("Tablos — Xtablo", user, csrfToken) {
		<div class="mb-4">
			<a href="/" class="text-sm text-slate-600 hover:underline">&larr; Back to tablos</a>
		</div>
		<div class="tablo-title-zone">
			@TabloTitleDisplay(tablo, csrfToken)
		</div>
		<div class="tablo-desc-zone">
			@TabloDescDisplay(tablo, csrfToken)
		</div>
		<div class="tablo-delete-zone">
			@TabloDeleteButtonFragment(tablo, csrfToken)
		</div>
		<!-- Tab navigation bar (D-07, D-08) -->
		<nav class="mt-8 flex gap-1 border-b border-slate-200">
			<a
				href={ templ.SafeURL("/tablos/" + tablo.ID.String()) }
				hx-get={ "/tablos/" + tablo.ID.String() }
				hx-target="#tab-content"
				hx-swap="innerHTML"
				hx-push-url={ "/tablos/" + tablo.ID.String() }
				if activeTab == "overview" || activeTab == "" {
					class="px-4 py-2 text-sm font-semibold border-b-2 border-slate-800 text-slate-800 -mb-px"
				} else {
					class="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 hover:border-b-2 hover:border-slate-400 -mb-px"
				}
			>Overview</a>
			<a
				href={ templ.SafeURL("/tablos/" + tablo.ID.String() + "/tasks") }
				hx-get={ "/tablos/" + tablo.ID.String() + "/tasks" }
				hx-target="#tab-content"
				hx-swap="innerHTML"
				hx-push-url={ "/tablos/" + tablo.ID.String() + "/tasks" }
				if activeTab == "tasks" {
					class="px-4 py-2 text-sm font-semibold border-b-2 border-slate-800 text-slate-800 -mb-px"
				} else {
					class="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 hover:border-b-2 hover:border-slate-400 -mb-px"
				}
			>Tasks</a>
			<a
				href={ templ.SafeURL("/tablos/" + tablo.ID.String() + "/files") }
				hx-get={ "/tablos/" + tablo.ID.String() + "/files" }
				hx-target="#tab-content"
				hx-swap="innerHTML"
				hx-push-url={ "/tablos/" + tablo.ID.String() + "/files" }
				if activeTab == "files" {
					class="px-4 py-2 text-sm font-semibold border-b-2 border-slate-800 text-slate-800 -mb-px"
				} else {
					class="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 hover:border-b-2 hover:border-slate-400 -mb-px"
				}
			>Files</a>
			<a
				href={ templ.SafeURL("/tablos/" + tablo.ID.String() + "/events") }
				hx-get={ "/tablos/" + tablo.ID.String() + "/events" }
				hx-target="#tab-content"
				hx-swap="innerHTML"
				hx-push-url={ "/tablos/" + tablo.ID.String() + "/events" }
				if activeTab == "events" {
					class="px-4 py-2 text-sm font-semibold border-b-2 border-slate-800 text-slate-800 -mb-px"
				} else {
					class="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 hover:border-b-2 hover:border-slate-400 -mb-px"
				}
			>Events</a>
			<a
				href={ templ.SafeURL("/tablos/" + tablo.ID.String() + "/discussion") }
				hx-get={ "/tablos/" + tablo.ID.String() + "/discussion" }
				hx-target="#tab-content"
				hx-swap="innerHTML"
				hx-push-url={ "/tablos/" + tablo.ID.String() + "/discussion" }
				if activeTab == "discussion" {
					class="px-4 py-2 text-sm font-semibold border-b-2 border-slate-800 text-slate-800 -mb-px"
				} else {
					class="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 hover:border-b-2 hover:border-slate-400 -mb-px"
				}
			>Discussion</a>
		</nav>
		<!-- Tab content area — HTMX tab switches target this div -->
		<div id="tab-content" class="mt-6">
			if activeTab == "tasks" {
				@TasksTabFragment(tablo, tasks, etapes, counts, filter, csrfToken)
			} else if activeTab == "files" {
				@FilesTabFragment(tablo, files, csrfToken)
			} else if activeTab == "events" {
				@EventsTabFragment(tablo, events, csrfToken)
			} else if activeTab == "discussion" {
				@DiscussionTabFragment(tablo, discussion, DiscussionForm{}, DiscussionErrors{}, csrfToken)
			} else {
				@TabloOverviewTabFragment(tablo, csrfToken)
			}
		</div>
	}
}

// TabloOverviewTabFragment renders the overview tab content — description display.
// Returned as a standalone fragment for HTMX tab-switch responses.
templ TabloOverviewTabFragment(tablo sqlc.Tablo, csrfToken string) {
	<div class="overview-tab">
		if tablo.Description.Valid && tablo.Description.String != "" {
			<p class="text-base text-slate-600">{ tablo.Description.String }</p>
		} else {
			<p class="text-sm text-slate-400 italic">No description.</p>
		}
	</div>
}

// TasksTabFragment wraps the KanbanBoard for use as a standalone HTMX tab fragment.
// Returned by TabloTasksTabHandler on HX-Request == "true".
// Lives in tablos.templ (tablo-level concern) per plan D-07.
templ TasksTabFragment(tablo sqlc.Tablo, tasks []sqlc.Task, etapes []sqlc.Etape, counts EtapeTaskCounts, filter EtapeFilter, csrfToken string) {
	<div id="tasks-tab">
		@EtapeStrip(tablo.ID, etapes, counts, filter, csrfToken, false)
		@KanbanBoard(tablo.ID, csrfToken, tasks, filter)
	</div>
}

// TabloTitleDisplay renders the tablo title as a clickable element that swaps
// to the edit form on click. The outermost element carries class tablo-title-zone
// so hx-target="closest .tablo-title-zone" + hx-swap="outerHTML" round-trips cleanly.
// UI-SPEC §4 Interaction Contract — title inline-edit display state.
templ TabloTitleDisplay(tablo sqlc.Tablo, csrfToken string) {
	<h1
		class="tablo-title-zone text-xl font-semibold leading-snug cursor-pointer hover:text-slate-600"
		hx-get={ "/tablos/" + tablo.ID.String() + "/edit-title" }
		hx-target="closest .tablo-title-zone"
		hx-swap="outerHTML"
		role="button"
		aria-label="Edit title"
	>{ tablo.Title }</h1>
}

// TabloTitleEditFragment renders the inline title edit form. Carries class
// tablo-title-zone on the form element so outerHTML round-trips work correctly.
// Includes hidden description field (current value) + hidden _zone="title" for
// TabloUpdateHandler to know which display fragment to render on success.
// UI-SPEC §4 Interaction Contract — title inline-edit edit state.
templ TabloTitleEditFragment(tablo sqlc.Tablo, errs TabloUpdateErrors, csrfToken string) {
	<form
		class="tablo-title-zone space-y-3"
		method="POST"
		action={ templ.SafeURL("/tablos/" + tablo.ID.String()) }
		hx-post={ "/tablos/" + tablo.ID.String() }
		hx-target="closest .tablo-title-zone"
		hx-swap="outerHTML"
	>
		@ui.CSRFField(csrfToken)
		<input type="hidden" name="_zone" value="title"/>
		<input type="hidden" name="description" value={ tablo.Description.String }/>
		<div>
			<label for="title" class="block text-sm font-medium text-slate-700">Title</label>
			<input
				id="title"
				type="text"
				name="title"
				value={ tablo.Title }
				required
				class="mt-1 block w-full rounded border border-slate-300 px-3 py-2 text-sm placeholder-slate-400 focus:border-slate-500 focus:outline-none"
			/>
			@FieldError(errs.Title)
		</div>
		<div class="flex items-center gap-3">
			@ui.Button(ui.ButtonProps{
				Label:   "Save changes",
				Variant: ui.ButtonVariantDefault,
				Tone:    ui.ButtonToneSolid,
				Size:    ui.SizeMD,
				Type:    "submit",
			})
			@ui.Button(ui.ButtonProps{
				Label:   "Discard changes",
				Variant: ui.ButtonVariantNeutral,
				Tone:    ui.ButtonToneSoft,
				Size:    ui.SizeMD,
				Type:    "button",
				Attrs: templ.Attributes{
					"hx-get":    "/tablos/" + tablo.ID.String() + "/show-title",
					"hx-target": "closest .tablo-title-zone",
					"hx-swap":   "outerHTML",
				},
			})
		</div>
	</form>
}

// TabloDescDisplay renders the tablo description as a clickable element that
// swaps to the edit form on click. Carries class tablo-desc-zone on the outermost
// element for clean outerHTML round-trips.
// UI-SPEC §4 Interaction Contract — description inline-edit display state.
templ TabloDescDisplay(tablo sqlc.Tablo, csrfToken string) {
	<div
		class="tablo-desc-zone mt-4 cursor-pointer hover:text-slate-600"
		hx-get={ "/tablos/" + tablo.ID.String() + "/edit-desc" }
		hx-target="closest .tablo-desc-zone"
		hx-swap="outerHTML"
		role="button"
		aria-label="Edit description"
	>
		if tablo.Description.Valid && tablo.Description.String != "" {
			<p class="text-base text-slate-600">{ tablo.Description.String }</p>
		} else {
			<p class="text-sm text-slate-400 italic">Add a description</p>
		}
	</div>
}

// TabloDescEditFragment renders the inline description edit form. Carries class
// tablo-desc-zone on the form element so outerHTML round-trips work correctly.
// Includes hidden title field (current value) + hidden _zone="desc" for
// TabloUpdateHandler to know which display fragment to render on success.
// UI-SPEC §4 Interaction Contract — description inline-edit edit state.
templ TabloDescEditFragment(tablo sqlc.Tablo, errs TabloUpdateErrors, csrfToken string) {
	<form
		class="tablo-desc-zone mt-4 space-y-3"
		method="POST"
		action={ templ.SafeURL("/tablos/" + tablo.ID.String()) }
		hx-post={ "/tablos/" + tablo.ID.String() }
		hx-target="closest .tablo-desc-zone"
		hx-swap="outerHTML"
	>
		@ui.CSRFField(csrfToken)
		<input type="hidden" name="_zone" value="desc"/>
		<input type="hidden" name="title" value={ tablo.Title }/>
		<div>
			<label for="description" class="block text-sm font-medium text-slate-700">Description <span class="text-slate-400">(optional)</span></label>
			<textarea
				id="description"
				name="description"
				rows="3"
				class="mt-1 block w-full rounded border border-slate-300 px-3 py-2 text-sm placeholder-slate-400 focus:border-slate-500 focus:outline-none"
			>{ tablo.Description.String }</textarea>
			@FieldError(errs.Description)
		</div>
		<div class="flex items-center gap-3">
			@ui.Button(ui.ButtonProps{
				Label:   "Save changes",
				Variant: ui.ButtonVariantDefault,
				Tone:    ui.ButtonToneSolid,
				Size:    ui.SizeMD,
				Type:    "submit",
			})
			@ui.Button(ui.ButtonProps{
				Label:   "Discard changes",
				Variant: ui.ButtonVariantNeutral,
				Tone:    ui.ButtonToneSoft,
				Size:    ui.SizeMD,
				Type:    "button",
				Attrs: templ.Attributes{
					"hx-get":    "/tablos/" + tablo.ID.String() + "/show-desc",
					"hx-target": "closest .tablo-desc-zone",
					"hx-swap":   "outerHTML",
				},
			})
		</div>
	</form>
}

// TabloDeleteButtonFragment renders the delete trigger button wrapped in a
// .tablo-delete-zone div. This is the canonical single source of truth for the
// delete zone shape — TabloCard delegates to this component (no duplication).
// UI-SPEC §5 Interaction Contract — delete display state.
templ TabloDeleteButtonFragment(tablo sqlc.Tablo, csrfToken string) {
	<div class="tablo-delete-zone">
		@ui.Button(ui.ButtonProps{
			Label:   "Delete",
			Variant: ui.ButtonVariantDanger,
			Tone:    ui.ButtonToneSoft,
			Size:    ui.SizeMD,
			Type:    "button",
			Attrs: templ.Attributes{
				"hx-get":    "/tablos/" + tablo.ID.String() + "/delete-confirm",
				"hx-target": "closest .tablo-delete-zone",
				"hx-swap":   "outerHTML",
				"aria-label": "Delete tablo",
			},
		})
	</div>
}

// TabloDeleteConfirmFragment renders the inline confirmation dialog that appears
// when the user clicks Delete. Carries class tablo-delete-zone for outerHTML
// round-trips. "Yes, delete" submits the DELETE action; "Keep tablo" restores
// the original Delete button via TabloDeleteCancelHandler.
// UI-SPEC §5 Interaction Contract — delete confirmation state.
templ TabloDeleteConfirmFragment(tablo sqlc.Tablo, csrfToken string) {
	<div class="tablo-delete-zone space-y-3">
		<p class="text-base font-semibold text-slate-800">Delete tablo?</p>
		<p class="text-sm text-slate-600">This cannot be undone.</p>
		<div class="flex items-center gap-3">
			<form
				method="POST"
				action={ templ.SafeURL("/tablos/" + tablo.ID.String() + "/delete") }
				hx-post={ "/tablos/" + tablo.ID.String() + "/delete" }
				hx-target="closest .tablo-delete-zone"
				hx-swap="outerHTML"
			>
				@ui.CSRFField(csrfToken)
				@ui.Button(ui.ButtonProps{
					Label:   "Yes, delete",
					Variant: ui.ButtonVariantDanger,
					Tone:    ui.ButtonToneSolid,
					Size:    ui.SizeMD,
					Type:    "submit",
					Attrs: templ.Attributes{
						"aria-label": "Confirm delete tablo",
					},
				})
			</form>
			@ui.Button(ui.ButtonProps{
				Label:   "Keep tablo",
				Variant: ui.ButtonVariantNeutral,
				Tone:    ui.ButtonToneSoft,
				Size:    ui.SizeMD,
				Type:    "button",
				Attrs: templ.Attributes{
					"hx-get":    "/tablos/" + tablo.ID.String() + "/delete-cancel",
					"hx-target": "closest .tablo-delete-zone",
					"hx-swap":   "outerHTML",
					"aria-label": "Keep tablo",
				},
			})
		</div>
	</div>
}

// TabloNotFoundPage renders a 404 page for tablos that don't exist or are not
// accessible by the current user (D-04: 404 not 403 to avoid existence leakage).
// user may be nil when called from an unauthenticated context — Layout handles nil.
// UI-SPEC Copywriting Contract: "Not found" + "This tablo doesn't exist or you don't have access."
templ TabloNotFoundPage(user *auth.User, csrfToken string) {
	@Layout("Not found", user, csrfToken) {
		<div class="py-16 text-center">
			<h1 class="text-2xl font-semibold leading-snug text-slate-800">Not found</h1>
			<p class="mt-2 text-base text-slate-600">This tablo doesn&#39;t exist or you don&#39;t have access.</p>
			<div class="mt-6">
				<a href="/" class="text-sm font-medium text-blue-600 hover:underline">Back to tablos</a>
			</div>
		</div>
	}
}
