package templates

import (
	"bytes"
	"context"
	"fmt"

	"vetting/internal/model"
	"vetting/internal/store"
)

// HostDetailData is the full payload the detail handler hands to the
// HostDetail template. Tile carries host + latest-run enrichment (same
// shape the dashboard tile uses), Stages/SpecDiffs drive the pipeline
// and diff list. LogReplay is the pre-rendered history fragment
// produced by logs.Hub.Replay on the initial page render so the operator
// sees prior output without waiting for a fresh SSE event.
type HostDetailData struct {
	Tile      TileData
	Stages    []model.Stage
	SpecDiffs []model.SpecDiff
	LogReplay string
}

templ HostDetail(d HostDetailData) {
	@Layout(d.Tile.Host.Name) {
		<section class="detail" hx-ext="sse" sse-connect="/events">
			<nav class="breadcrumb">
				<a href="/">Dashboard</a>
				<span class="breadcrumb-sep">/</span>
				<span>{ d.Tile.Host.Name }</span>
			</nav>

			@DetailSummary(d)

			if d.Tile.Latest != nil {
				<section
					id={ fmt.Sprintf("pipeline-%d", d.Tile.Latest.ID) }
					class="detail-section"
					sse-swap={ fmt.Sprintf("pipeline-%d", d.Tile.Latest.ID) }
					hx-swap="outerHTML"
				>
					<h2>Pipeline</h2>
					@Pipeline(BuildPipeline(d.Tile.Latest, d.Stages))
				</section>
			} else {
				<section class="detail-section">
					<h2>Pipeline</h2>
					@Pipeline(BuildPipeline(nil, nil))
				</section>
			}

			@DetailHold(d)
			@DetailActions(d)
			@DetailSpecDiffs(d)

			if d.Tile.Latest != nil {
				@LogTabs(d.Tile.Latest.ID, d.LogReplay)
			}

			<section class="detail-section detail-host-meta">
				<details>
					<summary><h2>Host details</h2></summary>
					if d.Tile.Host.Notes != "" {
						<div class="detail-notes">
							<h3>Notes</h3>
							<p>{ d.Tile.Host.Notes }</p>
						</div>
					}
					<div class="detail-spec">
						<h3>Expected spec</h3>
						<pre class="detail-spec-yaml">{ d.Tile.Host.ExpectedSpecYAML }</pre>
					</div>
				</details>
			</section>
		</section>
	}
}

// DetailSummary is the status header at the top of the detail page:
// name, last-seen badge, run status, MAC/WoL/failed-stage/spec-diffs
// meta grid. Keyed on host ID so the SSE event name is stable across
// run turnover.
templ DetailSummary(d HostDetailData) {
	<header
		id={ fmt.Sprintf("detail-summary-%d", d.Tile.Host.ID) }
		class={ "detail-summary", "tile-" + tileMood(d.Tile.Latest) }
		sse-swap={ fmt.Sprintf("detail-summary-%d", d.Tile.Host.ID) }
		hx-swap="outerHTML"
	>
		<div class="detail-summary-head">
			<h1 class="detail-name">{ d.Tile.Host.Name }</h1>
			<div class="detail-status-row">
				<span class={ "tile-last-seen", lastSeenClass(d.Tile.LastSeenAt) }>{ lastSeenLabel(d.Tile.LastSeenAt) }</span>
				<span class="tile-status">{ tileStatus(d.Tile.Latest) }</span>
			</div>
		</div>
		<dl class="detail-meta">
			<div>
				<dt>MAC</dt>
				<dd>{ d.Tile.Host.MAC }</dd>
			</div>
			<div>
				<dt>WoL</dt>
				<dd>{ fmt.Sprintf("%s:%d", d.Tile.Host.WoLBroadcastIP, d.Tile.Host.WoLPort) }</dd>
			</div>
			if d.Tile.Latest != nil && d.Tile.Latest.FailedStage != "" {
				<div>
					<dt>Failed at</dt>
					<dd class="bad">{ d.Tile.Latest.FailedStage }</dd>
				</div>
			}
			if d.Tile.SpecDiffCritical > 0 {
				<div>
					<dt>Spec diffs</dt>
					<dd class="bad">{ fmt.Sprintf("%d critical", d.Tile.SpecDiffCritical) }</dd>
				</div>
			}
		</dl>
	</header>
}

// DetailActions is the button row (Start / Cancel / Override / View
// report / Delete). Enabled/disabled state depends on the latest run's
// state and host heartbeat; both change live, so this section re-renders
// on every state change. Keyed on host ID — the actions exist even
// without a run.
templ DetailActions(d HostDetailData) {
	<section
		id={ fmt.Sprintf("detail-actions-%d", d.Tile.Host.ID) }
		class="detail-section detail-actions"
		sse-swap={ fmt.Sprintf("detail-actions-%d", d.Tile.Host.ID) }
		hx-swap="outerHTML"
	>
		<h2>Actions</h2>
		<div class="detail-actions-row">
			if canStart(d.Tile) {
				<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/start", d.Tile.Host.ID)) } class="inline detail-start-form">
					<label class="detail-nd-toggle">
						<input type="checkbox" name="non_destructive" value="1"/>
						Non-destructive (skip wipe-probe + disk writes)
					</label>
					<button type="submit">Start vetting</button>
				</form>
			} else if canStartIfOnline(d.Tile.Latest) {
				<button type="button" disabled title="host is not heartbeating — install the reporter via /register/quick.sh on the target host">Start vetting</button>
			} else {
				<button type="button" disabled>Run in flight</button>
			}
			if canCancel(d.Tile.Latest) {
				<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/cancel", d.Tile.Host.ID)) } class="inline" onsubmit="return confirm('Cancel run? Destructive stages may leave the host in an intermediate state requiring manual cleanup.');">
					<button type="submit" class="danger">Cancel run</button>
				</form>
			}
			if canOverrideWipe(d.Tile.Latest) {
				<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/override-wipe", d.Tile.Host.ID)) } class="inline">
					<button type="submit" class="danger">Override wipe-probe</button>
				</form>
			}
			if hasReport(d.Tile.Latest) {
				<a class="button-like" href={ templ.SafeURL(fmt.Sprintf("/reports/%d", d.Tile.Latest.ID)) } target="_blank" rel="noopener">View report</a>
			}
			<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/delete", d.Tile.Host.ID)) } class="inline">
				<button type="submit" class="danger">Delete host</button>
			</form>
		</div>
	</section>
}

// DetailSpecDiffs renders the "Spec diffs (N)" collapsible when a run
// exists; otherwise it emits a bare empty wrapper so a later SSE push
// after SpecValidate writes has a target to swap into. The wrapper is
// keyed on run ID because the diffs belong to a specific run — a new
// run publishes to a new event name, and the detail page navigates to
// the new target via outerHTML swap only when the whole DetailSpecDiffs
// section is re-rendered by a page reload.
templ DetailSpecDiffs(d HostDetailData) {
	if d.Tile.Latest != nil {
		<section
			id={ fmt.Sprintf("detail-specdiffs-%d", d.Tile.Latest.ID) }
			class="detail-section detail-diffs"
			sse-swap={ fmt.Sprintf("detail-specdiffs-%d", d.Tile.Latest.ID) }
			hx-swap="outerHTML"
		>
			if len(d.SpecDiffs) > 0 {
				<details open?={ hasCriticalDiff(d.SpecDiffs) }>
					<summary><h2>Spec diffs ({ fmt.Sprintf("%d", len(d.SpecDiffs)) })</h2></summary>
					<ul class="diff-list">
						for _, diff := range d.SpecDiffs {
							<li class={ "diff-row", "diff-" + diff.Severity }>
								<div class="diff-field">{ diff.Field }</div>
								<div class="diff-expected">expected: <code>{ diff.Expected }</code></div>
								<div class="diff-actual">actual: <code>{ diff.Actual }</code></div>
							</li>
						}
					</ul>
				</details>
			}
		</section>
	}
}

// DetailHold renders the "Host is holding — SSH available" block while
// a run is in FailedHolding with an IP recorded. Otherwise it emits an
// empty wrapper so the first push when the hold actually fires has a
// target. Keyed on run ID for the same reason as DetailSpecDiffs.
templ DetailHold(d HostDetailData) {
	if d.Tile.Latest != nil {
		<section
			id={ fmt.Sprintf("detail-hold-%d", d.Tile.Latest.ID) }
			class="detail-section detail-hold"
			sse-swap={ fmt.Sprintf("detail-hold-%d", d.Tile.Latest.ID) }
			hx-swap="outerHTML"
		>
			if d.Tile.Latest.State == model.StateFailedHolding && d.Tile.Latest.HoldIP != "" {
				<h2>Host is holding — SSH available</h2>
				<code class="hold-ssh">{ sshInvocation(d.Tile.HoldKeyPath, d.Tile.Latest.HoldIP) }</code>
			}
		</section>
	}
}

// RenderDetailSummaryString, RenderDetailActionsString,
// RenderDetailSpecDiffsString, RenderDetailHoldString each render one
// component to a string so the orchestrator can publish SSE fragments
// without importing the HTTP layer. Matches the RenderTileString /
// RenderPipelineString pattern.
func RenderDetailSummaryString(d HostDetailData) string {
	var buf bytes.Buffer
	_ = DetailSummary(d).Render(context.Background(), &buf)
	return buf.String()
}

func RenderDetailActionsString(d HostDetailData) string {
	var buf bytes.Buffer
	_ = DetailActions(d).Render(context.Background(), &buf)
	return buf.String()
}

func RenderDetailSpecDiffsString(d HostDetailData) string {
	var buf bytes.Buffer
	_ = DetailSpecDiffs(d).Render(context.Background(), &buf)
	return buf.String()
}

func RenderDetailHoldString(d HostDetailData) string {
	var buf bytes.Buffer
	_ = DetailHold(d).Render(context.Background(), &buf)
	return buf.String()
}

// hasCriticalDiff opens the spec-diff <details> by default when any
// diff is critical — operator shouldn't have to click to see the blocker.
func hasCriticalDiff(diffs []model.SpecDiff) bool {
	for _, d := range diffs {
		if d.Severity == "critical" && !d.Ignored {
			return true
		}
	}
	return false
}

// LogTabs renders an "All" tab plus one tab per stage in DefaultStageOrder.
// Switching is pure CSS: hidden radio inputs drive sibling-selector
// visibility on the panes. Each pane carries its own sse-swap target so
// live events append only to the relevant pane. The All pane is seeded
// with replay HTML so reload on an in-flight run still shows history.
templ LogTabs(runID int64, replay string) {
	<section class="detail-section log-section">
		<h2>Log</h2>
		<div class="log-tabs">
			<input type="radio" name={ fmt.Sprintf("log-tab-%d", runID) } id={ fmt.Sprintf("log-tab-%d-all", runID) } class="log-tab-input log-tab-all" checked/>
			<label for={ fmt.Sprintf("log-tab-%d-all", runID) } class="log-tab-label">All</label>
			for _, s := range store.DefaultStageOrder {
				<input type="radio" name={ fmt.Sprintf("log-tab-%d", runID) } id={ fmt.Sprintf("log-tab-%d-%s", runID, s) } class={ "log-tab-input", "log-tab-" + s }/>
				<label for={ fmt.Sprintf("log-tab-%d-%s", runID, s) } class="log-tab-label">{ s }</label>
			}
			<div
				class="log-pane log-pane-all"
				id={ fmt.Sprintf("log-%d", runID) }
				sse-swap={ fmt.Sprintf("log-%d", runID) }
				hx-swap="beforeend show:bottom"
			>
				@templ.Raw(replay)
			</div>
			for _, s := range store.DefaultStageOrder {
				<div
					class={ "log-pane", "log-pane-" + s }
					id={ fmt.Sprintf("log-%d-%s", runID, s) }
					sse-swap={ fmt.Sprintf("log-%d-%s", runID, s) }
					hx-swap="beforeend show:bottom"
				></div>
			}
		</div>
	</section>
}