package orchestrator_test

import (
	"context"
	"fmt"
	"path/filepath"
	"testing"
	"time"

	"vetting/internal/db"
	"vetting/internal/events"
	"vetting/internal/model"
	"vetting/internal/orchestrator"
	"vetting/internal/store"
)

// setupRunner wires a real DB + stores + hub and registers a minimal
// TileRenderer/PipelineRenderer so publishTileUpdate emits something
// recognisable. Returns Runner plus helpers to drain events.
func setupRunner(t *testing.T) (*orchestrator.Runner, *store.Hosts, *store.Runs, *events.Hub, func()) {
	t.Helper()
	conn, err := db.Open(filepath.Join(t.TempDir(), "vetting.db"))
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	hub := events.NewHub()
	hosts := &store.Hosts{DB: conn}
	runs := &store.Runs{DB: conn}
	stages := &store.Stages{DB: conn}
	runner := &orchestrator.Runner{Runs: runs, Hosts: hosts, Stages: stages, EventHub: hub}

	// Deterministic renderer stubs — use known substrings so tests can
	// grep the published fragments without parsing HTML.
	prevTile := orchestrator.TileRenderer
	prevPipe := orchestrator.PipelineRenderer
	prevDetail := orchestrator.HostDetailRenderer
	orchestrator.TileRenderer = func(_ context.Context, host model.Host, _ *model.Run) string {
		return fmt.Sprintf(`<article id="host-%d">tile</article>`, host.ID)
	}
	orchestrator.PipelineRenderer = func(run *model.Run, _ []model.Stage) string {
		return fmt.Sprintf(`<section id="pipeline-%d">pipeline</section>`, run.ID)
	}
	orchestrator.HostDetailRenderer = func(_ context.Context, hostID int64) (orchestrator.HostDetailFragments, bool) {
		var runID int64
		if latest, err := runs.LatestForHost(context.Background(), hostID); err == nil && latest != nil {
			runID = latest.ID
		}
		return orchestrator.HostDetailFragments{
			Summary:     fmt.Sprintf(`<header id="detail-summary-%d">summary</header>`, hostID),
			Actions:     fmt.Sprintf(`<section id="detail-actions-%d">actions</section>`, hostID),
			SpecDiffs:   fmt.Sprintf(`<section id="detail-specdiffs-%d">diffs</section>`, runID),
			Hold:        fmt.Sprintf(`<section id="detail-hold-%d">hold</section>`, runID),
			LatestRunID: runID,
		}, true
	}
	cleanup := func() {
		orchestrator.TileRenderer = prevTile
		orchestrator.PipelineRenderer = prevPipe
		orchestrator.HostDetailRenderer = prevDetail
		_ = conn.Close()
	}
	return runner, hosts, runs, hub, cleanup
}

// TestPublishesTileAndPipelineOnTransition asserts that a single
// Transition call publishes both the tile-{hostID} and pipeline-{runID}
// fragments — the detail-page timeline needs this to advance on every
// state change without its own call site.
func TestPublishesTileAndPipelineOnTransition(t *testing.T) {
	runner, hosts, runs, hub, cleanup := setupRunner(t)
	defer cleanup()
	ctx := context.Background()

	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "runner-tile",
		MAC:              "aa:bb:cc:dd:ee:40",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef", false)
	if err != nil {
		t.Fatalf("create run: %v", err)
	}

	_, _, cancel := hub.Subscribe()
	defer cancel()
	// Subscribe one more time so we have a channel we can drain.
	_, ch, cancel2 := hub.Subscribe()
	defer cancel2()

	// Queued → WaitingWoL on Dispatched.
	if _, err := runner.Transition(ctx, runID, orchestrator.TriggerDispatched); err != nil {
		t.Fatalf("transition: %v", err)
	}

	// Collect events with a short deadline; we expect tile + pipeline
	// from this one Transition call.
	wantTile := fmt.Sprintf("tile-%d", hostID)
	wantPipeline := fmt.Sprintf("pipeline-%d", runID)
	sawTile, sawPipeline := false, false
	deadline := time.After(500 * time.Millisecond)
loop:
	for {
		select {
		case ev := <-ch:
			if ev.Name == wantTile {
				sawTile = true
			}
			if ev.Name == wantPipeline {
				sawPipeline = true
			}
			if sawTile && sawPipeline {
				break loop
			}
		case <-deadline:
			break loop
		}
	}
	if !sawTile {
		t.Errorf("no %s event published", wantTile)
	}
	if !sawPipeline {
		t.Errorf("no %s event published", wantPipeline)
	}
}

// TestPublishesHostDetailFragments asserts that every state-change
// publish site also emits the four detail-page SSE events (summary,
// actions, specdiffs, hold). Without this, the host detail page
// stays frozen on the state at page-load time.
func TestPublishesHostDetailFragments(t *testing.T) {
	runner, hosts, runs, hub, cleanup := setupRunner(t)
	defer cleanup()
	ctx := context.Background()

	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "runner-detail",
		MAC:              "aa:bb:cc:dd:ee:42",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef", false)
	if err != nil {
		t.Fatalf("create run: %v", err)
	}

	_, ch, cancel := hub.Subscribe()
	defer cancel()

	if _, err := runner.Transition(ctx, runID, orchestrator.TriggerDispatched); err != nil {
		t.Fatalf("transition: %v", err)
	}

	want := map[string]bool{
		fmt.Sprintf("detail-summary-%d", hostID):    false,
		fmt.Sprintf("detail-actions-%d", hostID):    false,
		fmt.Sprintf("detail-specdiffs-%d", runID):   false,
		fmt.Sprintf("detail-hold-%d", runID):        false,
	}
	deadline := time.After(500 * time.Millisecond)
	for {
		allSeen := true
		for _, seen := range want {
			if !seen {
				allSeen = false
				break
			}
		}
		if allSeen {
			return
		}
		select {
		case ev := <-ch:
			if _, ok := want[ev.Name]; ok {
				want[ev.Name] = true
			}
		case <-deadline:
			for name, seen := range want {
				if !seen {
					t.Errorf("no %s event published", name)
				}
			}
			return
		}
	}
}

// TestCompleteStagePublishesPipeline covers the stage-completion path
// that used to go direct-to-Stages, bypassing the SSE refresh. The
// Runner.CompleteStage wrapper exists so stage-dot advancements show up
// on the detail page without waiting for the next run-state transition.
func TestCompleteStagePublishesPipeline(t *testing.T) {
	runner, hosts, runs, hub, cleanup := setupRunner(t)
	defer cleanup()
	ctx := context.Background()

	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "runner-cs",
		MAC:              "aa:bb:cc:dd:ee:41",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 8\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef", false)
	if err != nil {
		t.Fatalf("create run: %v", err)
	}
	// CompleteStage needs stage rows to exist first — Seed them.
	stages := &store.Stages{DB: runs.DB}
	if err := stages.Seed(ctx, runID); err != nil {
		t.Fatalf("seed stages: %v", err)
	}

	_, ch, cancel := hub.Subscribe()
	defer cancel()

	if err := runner.CompleteStage(ctx, runID, "Inventory", model.StagePassed, `{}`); err != nil {
		t.Fatalf("CompleteStage: %v", err)
	}

	wantPipeline := fmt.Sprintf("pipeline-%d", runID)
	deadline := time.After(500 * time.Millisecond)
	for {
		select {
		case ev := <-ch:
			if ev.Name == wantPipeline {
				return
			}
		case <-deadline:
			t.Fatalf("no %s event published by CompleteStage", wantPipeline)
		}
	}
}