package scheduler

import (
	"context"
	"errors"
	"testing"

	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/riverqueue/river"

	"github.com/nomadcode/nomadcode-core/internal/roadmapsync"
	"github.com/nomadcode/nomadcode-core/internal/roadmapsyncpipeline"
	"github.com/nomadcode/nomadcode-core/internal/workitem"
)

// fakeCreationSyncRunner records the input it was driven with so a worker test
// can assert the job args were mapped into the orchestrator input.
type fakeCreationSyncRunner struct {
	called bool
	input  roadmapsyncpipeline.SyncCreationInput
	result roadmapsyncpipeline.SyncCreationResult
	err    error
}

func (f *fakeCreationSyncRunner) SyncCreation(_ context.Context, in roadmapsyncpipeline.SyncCreationInput) (roadmapsyncpipeline.SyncCreationResult, error) {
	f.called = true
	f.input = in
	return f.result, f.err
}

func sampleCreationSyncArgs() RoadmapCreationSyncJobArgs {
	identity := roadmapsync.Identity{
		Shape:                roadmapsync.ShapeMilestone,
		RoadmapMilestonePath: "agent-roadmap/phase/p1/milestones/m1.md",
		Provider:             "plane",
		Tenant:               "general",
		Project:              "nomad",
		WorkItemID:           "NOMAD-1",
	}
	return RoadmapCreationSyncJobArgs{
		Expected:          identity,
		Ref:               workitem.Ref{Provider: "plane", ID: "NOMAD-1"},
		OriginalBody:      "<p>body</p>",
		TodoStateID:       "todo-state",
		MilestoneMarkdown: "# m",
		ProviderRevision:  "rev-1",
		RoadmapRevision:   "rev-1",
	}
}

func TestRoadmapCreationSyncWorkerCallsService(t *testing.T) {
	runner := &fakeCreationSyncRunner{
		result: roadmapsyncpipeline.SyncCreationResult{Action: roadmapsyncpipeline.SyncActionProjected},
	}
	worker := &RoadmapCreationSyncWorker{Sync: runner}

	args := sampleCreationSyncArgs()
	err := worker.Work(context.Background(), &river.Job[RoadmapCreationSyncJobArgs]{Args: args})
	if err != nil {
		t.Fatalf("Work returned error: %v", err)
	}
	if !runner.called {
		t.Fatal("expected orchestrator to be called")
	}
	if runner.input.Expected.WorkItemID != "NOMAD-1" {
		t.Errorf("unexpected work item id: %q", runner.input.Expected.WorkItemID)
	}
	if runner.input.MilestoneMarkdown != "# m" || runner.input.TodoStateID != "todo-state" {
		t.Errorf("job args not mapped into orchestrator input: %#v", runner.input)
	}
}

func TestRoadmapCreationSyncWorkerReturnsServiceError(t *testing.T) {
	wantErr := errors.New("provider failed")
	runner := &fakeCreationSyncRunner{err: wantErr}
	worker := &RoadmapCreationSyncWorker{Sync: runner}

	err := worker.Work(context.Background(), &river.Job[RoadmapCreationSyncJobArgs]{Args: sampleCreationSyncArgs()})
	if !errors.Is(err, wantErr) {
		t.Fatalf("expected service error to propagate (so River retries), got %v", err)
	}
}

// lazyPool builds a pgxpool without dialing. pgxpool.New is lazy and only
// connects on first acquire, so it is safe for constructing the scheduler in a
// unit test that never starts the client.
func lazyPool(t *testing.T) *pgxpool.Pool {
	t.Helper()
	pool, err := pgxpool.New(context.Background(), "postgres://user:pass@127.0.0.1:1/db")
	if err != nil {
		t.Fatalf("build lazy pool: %v", err)
	}
	t.Cleanup(pool.Close)
	return pool
}

func TestSchedulerRegistersRoadmapSyncWorkerWhenConfigured(t *testing.T) {
	runner := &fakeCreationSyncRunner{}
	client, err := New(lazyPool(t), nil, nil, nil, nil, runner, 0, nil)
	if err != nil {
		t.Fatalf("New with creation sync runner: %v", err)
	}
	if client == nil {
		t.Fatal("expected non-nil client")
	}
	// The enqueue seam exists regardless of registration; the worker registration
	// is exercised by New succeeding with a non-nil runner (River rejects an
	// unknown job kind only at insert/work time, so construction succeeding plus
	// the worker unit test above cover the wiring without a live DB).
}

func TestSchedulerWithoutRoadmapSyncKeepsTaskWorkerOnlyBehavior(t *testing.T) {
	client, err := New(lazyPool(t), nil, nil, nil, nil, nil, 0, nil)
	if err != nil {
		t.Fatalf("New without creation sync runner: %v", err)
	}
	if client == nil {
		t.Fatal("expected non-nil client")
	}
}