package templates

import (
	"bytes"
	"context"
	"fmt"
	"time"

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

// RunPageData is the full payload for /runs/{runID}. Host is resolved
// from Run.HostID so the breadcrumb + run actions (which post to
// /hosts/{hostID}/...) have the host context without a separate call.
// Stages/SubSteps/SpecDiffs drive the pipeline + active-step panels +
// diff list. DefaultStepStage is the stage name whose <details> opens
// on first render — running → failed → Reporting. HoldKeyPath is the
// on-disk path of the hold_key artifact, needed to print the ssh
// invocation in the hold banner. SpecDiffCritical is the count of
// unignored critical diffs shown in the header.
type RunPageData struct {
	Host             model.Host
	Run              model.Run
	Stages           []model.Stage
	SubSteps         []model.SubStep
	SpecDiffs        []model.SpecDiff
	DefaultStepStage string
	LogReplayByStage map[string]string
	HoldKeyPath      string
	SpecDiffCritical int
}

// RunPage is the run-focused URL: pipeline + per-stage active-step panels
// + spec diffs + hold banner. Host metadata stays on /hosts/{id}; this
// page carries only run-scoped content so the operator can read one run
// without surrounding noise.
templ RunPage(d RunPageData) {
	@Layout(fmt.Sprintf("%s — run #%d", d.Host.Name, d.Run.ID)) {
		<section class="run-page" hx-ext="sse" sse-connect="/events">
			<nav class="breadcrumb">
				<a href="/">Dashboard</a>
				<span class="breadcrumb-sep">/</span>
				<a href={ templ.SafeURL(fmt.Sprintf("/hosts/%d", d.Host.ID)) }>{ d.Host.Name }</a>
				<span class="breadcrumb-sep">/</span>
				<span>{ fmt.Sprintf("run #%d", d.Run.ID) }</span>
			</nav>

			@RunHeader(d)
			@HoldBanner(d)
			@PipelineSection(&d.Run, BuildPipeline(&d.Run, d.Stages))

			<div class="run-body">
				<div class="active-step-pane">
					for _, stageName := range store.DefaultStageOrder {
						@ActiveStep(ActiveStepData{
							RunID:     d.Run.ID,
							Stage:     stageForName(d.Stages, stageName),
							SubSteps:  SubStepsForStage(d.SubSteps, stageName),
							LogReplay: d.LogReplayByStage[stageName],
							Open:      stageName == d.DefaultStepStage,
						})
					}
				</div>
			</div>

			@RunSpecDiffs(d)
		</section>
	}
}

// RunHeader is the run-page header: run id, state badge, elapsed, and
// the primary action on the right (Cancel during a non-terminal run;
// Start-new-run + View-report after). Keyed on run ID so SSE updates
// don't collide with a newer run's header. Rendered as a section rather
// than a bare header so it composes with the breadcrumb strip above.
templ RunHeader(d RunPageData) {
	<header
		id={ fmt.Sprintf("run-header-%d", d.Run.ID) }
		class={ "run-header", "tile-" + tileMood(&d.Run) }
		sse-swap={ fmt.Sprintf("run-header-%d", d.Run.ID) }
		hx-swap="outerHTML"
	>
		<div class="run-header-left">
			<h1 class="run-header-name">{ fmt.Sprintf("Run #%d", d.Run.ID) }</h1>
			<span class={ "run-status-badge", "run-status-" + tileMood(&d.Run) }>{ tileStatus(&d.Run) }</span>
			<span class={ "run-profile-chip", "run-profile-" + profileChipValue(d.Run.Profile) }>{ profileChipValue(d.Run.Profile) }</span>
			<span
				class="run-duration"
				if !d.Run.State.IsTerminal() && !d.Run.StartedAt.IsZero() {
					data-started-at={ d.Run.StartedAt.UTC().Format(time.RFC3339Nano) }
				}
			>{ runDuration(&d.Run) }</span>
			if d.Run.FailedStage != "" {
				<span class="run-failed-stage">failed at <strong>{ d.Run.FailedStage }</strong></span>
			}
			if d.SpecDiffCritical > 0 {
				<span class="run-diffs bad">{ fmt.Sprintf("%d critical diff", d.SpecDiffCritical) }</span>
			}
		</div>
		<div class="run-header-right">
			if canCancel(&d.Run) {
				if d.Run.State == model.StateFailedHolding {
					<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/cancel", d.Host.ID)) } class="inline" data-confirm="Cancel held run? The host will reboot to local disk.">
						<button type="submit" class="btn-danger">Cancel &amp; reboot</button>
					</form>
				} else {
					<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/cancel", d.Host.ID)) } class="inline" data-confirm="Cancel run? Destructive stages may leave the host mid-operation.">
						<button type="submit" class="btn-danger">Cancel run</button>
					</form>
				}
			}
			if canOverrideWipe(&d.Run) {
				<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/override-wipe", d.Host.ID)) } class="inline">
					<button type="submit" class="btn-danger">Override wipe-probe</button>
				</form>
			}
			if hasReport(&d.Run) {
				<a class="button-like" href={ templ.SafeURL(fmt.Sprintf("/reports/%d", d.Run.ID)) } target="_blank" rel="noopener">View report</a>
			}
			if d.Run.State.IsTerminal() {
				<form method="post" action={ templ.SafeURL(fmt.Sprintf("/hosts/%d/start", d.Host.ID)) } class="inline">
					<button type="submit" class="btn-primary">Start new run</button>
				</form>
			}
		</div>
	</header>
}

// HoldBanner is the "Host is holding — SSH available" strip when a run
// is FailedHolding with an IP recorded. Emits an empty placeholder
// otherwise so the first SSE push when a hold actually fires has a
// target to swap into.
templ HoldBanner(d RunPageData) {
	if d.Run.State == model.StateFailedHolding && d.Run.HoldIP != "" {
		<section
			id={ fmt.Sprintf("detail-hold-%d", d.Run.ID) }
			class="hold-banner"
			sse-swap={ fmt.Sprintf("detail-hold-%d", d.Run.ID) }
			hx-swap="outerHTML"
		>
			<span class="hold-banner-label">Host is holding — SSH available:</span>
			<div class="copyable-wrap">
				<code class="hold-ssh">{ sshInvocation(d.HoldKeyPath, d.Run.HoldIP) }</code>
				<button type="button" class="copy-btn" data-copy-target="previousSibling">Copy</button>
			</div>
		</section>
	} else {
		<section
			id={ fmt.Sprintf("detail-hold-%d", d.Run.ID) }
			class="detail-hold-placeholder"
			sse-swap={ fmt.Sprintf("detail-hold-%d", d.Run.ID) }
			hx-swap="outerHTML"
		></section>
	}
}

// RunSpecDiffs renders the "Spec diffs (N)" collapsible. The wrapper is
// always emitted (even when empty) so SpecValidate-time SSE pushes have
// a target; the <details> body only renders when diffs exist.
templ RunSpecDiffs(d RunPageData) {
	<section
		id={ fmt.Sprintf("detail-specdiffs-%d", d.Run.ID) }
		class="detail-section detail-diffs"
		sse-swap={ fmt.Sprintf("detail-specdiffs-%d", d.Run.ID) }
		hx-swap="outerHTML"
	>
		if len(d.SpecDiffs) > 0 {
			<details open?={ hasCriticalDiff(d.SpecDiffs) }>
				<summary>
					<h2>Spec diffs</h2>
					<span class={ "diff-badge", diffBadgeClass(d.SpecDiffs) }>{ fmt.Sprintf("%d", len(d.SpecDiffs)) }</span>
				</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>
}

// RenderRunHeaderString, RenderHoldBannerString, and
// RenderRunSpecDiffsString render each region to a string for the
// orchestrator's SSE publish path. Matches the RenderTileString pattern.
func RenderRunHeaderString(d RunPageData) string {
	var buf bytes.Buffer
	_ = RunHeader(d).Render(context.Background(), &buf)
	return buf.String()
}

func RenderHoldBannerString(d RunPageData) string {
	var buf bytes.Buffer
	_ = HoldBanner(d).Render(context.Background(), &buf)
	return buf.String()
}

func RenderRunSpecDiffsString(d RunPageData) string {
	var buf bytes.Buffer
	_ = RunSpecDiffs(d).Render(context.Background(), &buf)
	return buf.String()
}