package nws

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"gitea.maximumdirect.net/ejr/feedkit/config"
	"gitea.maximumdirect.net/ejr/feedkit/event"
	"gitea.maximumdirect.net/ejr/weatherfeeder/standards"
)

func TestWeatherStoriesSourcePollEmitsExpectedEventAndPrefersLatestUpdateTime(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{
			"stories": [
				{"startTime":"2026-05-30T08:46:00+00:00","updateTime":"2026-05-30T09:00:34+00:00"},
				{"startTime":"2026-05-30T10:00:00+00:00","updateTime":"2026-05-30T11:00:34+00:00"}
			]
		}`))
	}))
	defer srv.Close()

	src, err := NewWeatherStoriesSource(weatherStoriesSourceConfig(srv.URL))
	if err != nil {
		t.Fatalf("NewWeatherStoriesSource() error = %v", err)
	}
	if got := src.Kinds(); len(got) != 1 || got[0] != event.Kind(standards.KindWeatherStory) {
		t.Fatalf("Kinds() = %#v, want [weather_story]", got)
	}

	events, err := src.Poll(context.Background())
	if err != nil {
		t.Fatalf("Poll() error = %v", err)
	}
	if len(events) != 1 {
		t.Fatalf("Poll() len = %d, want 1", len(events))
	}

	got := events[0]
	if got.Kind != event.Kind(standards.KindWeatherStory) {
		t.Fatalf("Kind = %q, want weather_story", got.Kind)
	}
	if got.Schema != standards.SchemaRawNWSWeatherStoriesV1 {
		t.Fatalf("Schema = %q, want %q", got.Schema, standards.SchemaRawNWSWeatherStoriesV1)
	}
	wantEffectiveAt := time.Date(2026, 5, 30, 11, 0, 34, 0, time.UTC)
	if got.EffectiveAt == nil || !got.EffectiveAt.Equal(wantEffectiveAt) {
		t.Fatalf("EffectiveAt = %v, want %s", got.EffectiveAt, wantEffectiveAt.Format(time.RFC3339))
	}
	if _, ok := got.Payload.(json.RawMessage); !ok {
		t.Fatalf("Payload type = %T, want json.RawMessage", got.Payload)
	}
}

func TestWeatherStoriesSourcePollEffectiveAtFallsBackToLatestStartTime(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{
			"stories": [
				{"startTime":"2026-05-30T08:46:00+00:00","updateTime":"bad"},
				{"startTime":"2026-05-31T11:00:00+00:00","updateTime":""}
			]
		}`))
	}))
	defer srv.Close()

	src, err := NewWeatherStoriesSource(weatherStoriesSourceConfig(srv.URL))
	if err != nil {
		t.Fatalf("NewWeatherStoriesSource() error = %v", err)
	}

	events, err := src.Poll(context.Background())
	if err != nil {
		t.Fatalf("Poll() error = %v", err)
	}
	if len(events) != 1 {
		t.Fatalf("Poll() len = %d, want 1", len(events))
	}
	wantEffectiveAt := time.Date(2026, 5, 31, 11, 0, 0, 0, time.UTC)
	if events[0].EffectiveAt == nil || !events[0].EffectiveAt.Equal(wantEffectiveAt) {
		t.Fatalf("EffectiveAt = %v, want %s", events[0].EffectiveAt, wantEffectiveAt.Format(time.RFC3339))
	}
}

func TestWeatherStoriesSourcePollReturnsNoEventsWhenUnchanged(t *testing.T) {
	const etag = `"stories-v1"`
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Header.Get("If-None-Match") == etag {
			w.WriteHeader(http.StatusNotModified)
			return
		}
		w.Header().Set("ETag", etag)
		_, _ = w.Write([]byte(`{"stories":[]}`))
	}))
	defer srv.Close()

	src, err := NewWeatherStoriesSource(weatherStoriesSourceConfig(srv.URL))
	if err != nil {
		t.Fatalf("NewWeatherStoriesSource() error = %v", err)
	}

	first, err := src.Poll(context.Background())
	if err != nil {
		t.Fatalf("first Poll() error = %v", err)
	}
	if len(first) != 1 {
		t.Fatalf("first Poll() len = %d, want 1", len(first))
	}

	second, err := src.Poll(context.Background())
	if err != nil {
		t.Fatalf("second Poll() error = %v", err)
	}
	if len(second) != 0 {
		t.Fatalf("second Poll() len = %d, want 0", len(second))
	}
}

func TestWeatherStoriesSourcePollMetadataDecodeFailureStillEmitsRawEvent(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`not-json`))
	}))
	defer srv.Close()

	src, err := NewWeatherStoriesSource(weatherStoriesSourceConfig(srv.URL))
	if err != nil {
		t.Fatalf("NewWeatherStoriesSource() error = %v", err)
	}

	events, err := src.Poll(context.Background())
	if err != nil {
		t.Fatalf("Poll() error = %v", err)
	}
	if len(events) != 1 {
		t.Fatalf("Poll() len = %d, want 1", len(events))
	}
	if events[0].EffectiveAt != nil {
		t.Fatalf("EffectiveAt = %v, want nil", events[0].EffectiveAt)
	}
	if events[0].Schema != standards.SchemaRawNWSWeatherStoriesV1 {
		t.Fatalf("Schema = %q, want %q", events[0].Schema, standards.SchemaRawNWSWeatherStoriesV1)
	}
}

func weatherStoriesSourceConfig(url string) config.SourceConfig {
	return config.SourceConfig{
		Name:   "test-weatherstories-source",
		Driver: DriverWeatherStories,
		Mode:   config.SourceModePoll,
		Params: map[string]any{
			"url":        url,
			"user_agent": "test-agent",
		},
	}
}