package nws

import (
	"encoding/json"
	"strings"
	"testing"
	"time"

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

func TestWeatherStoriesNormalizerProducesCanonicalSchemaAndMapsSample(t *testing.T) {
	out, err := (WeatherStoriesNormalizer{}).Normalize(nil, weatherStoriesRawEvent(weatherStoriesSamplePayload()))
	if err != nil {
		t.Fatalf("Normalize() error = %v", err)
	}
	if out == nil {
		t.Fatalf("Normalize() returned nil output")
	}
	if out.Schema != standards.SchemaWeatherStoryV1 {
		t.Fatalf("Schema = %q, want %q", out.Schema, standards.SchemaWeatherStoryV1)
	}
	if out.Kind != event.Kind("weather_story") {
		t.Fatalf("Kind = %q, want weather_story", out.Kind)
	}

	payload, ok := out.Payload.(model.WeatherStoryRun)
	if !ok {
		t.Fatalf("Payload type = %T, want model.WeatherStoryRun", out.Payload)
	}
	if payload.OfficeID != "LSX" {
		t.Fatalf("OfficeID = %q, want LSX", payload.OfficeID)
	}
	wantAsOf := time.Date(2026, 5, 30, 9, 0, 34, 0, time.UTC)
	if !payload.AsOf.Equal(wantAsOf) {
		t.Fatalf("AsOf = %s, want %s", payload.AsOf, wantAsOf)
	}
	if out.EffectiveAt == nil || !out.EffectiveAt.Equal(wantAsOf) {
		t.Fatalf("EffectiveAt = %v, want %s", out.EffectiveAt, wantAsOf)
	}
	if len(payload.Stories) != 1 {
		t.Fatalf("Stories len = %d, want 1", len(payload.Stories))
	}
	story := payload.Stories[0]
	if story.Title != "Several Chances for Rain Through Monday" {
		t.Fatalf("Title = %q", story.Title)
	}
	if story.Description != "A stagnant weather pattern." {
		t.Fatalf("Description = %q", story.Description)
	}
	if story.AltText != "This slide shows the forecast." {
		t.Fatalf("AltText = %q", story.AltText)
	}
	if story.Priority {
		t.Fatalf("Priority = true, want false")
	}
	if story.Order != 1 {
		t.Fatalf("Order = %d, want 1", story.Order)
	}
	if story.DownloadURL != "https://api.weather.gov/offices/LSX/weatherstories/download/3228e499-2aae-45a8-9ff9-1c060311026f" {
		t.Fatalf("DownloadURL = %q", story.DownloadURL)
	}
}

func TestWeatherStoriesNormalizerEmptyStoriesUsesFallbackAsOf(t *testing.T) {
	effectiveAt := time.Date(2026, 5, 30, 12, 0, 0, 0, time.UTC)
	in := weatherStoriesRawEvent(`{"stories":[]}`)
	in.EffectiveAt = &effectiveAt

	out, err := (WeatherStoriesNormalizer{}).Normalize(nil, in)
	if err != nil {
		t.Fatalf("Normalize() error = %v", err)
	}
	payload, ok := out.Payload.(model.WeatherStoryRun)
	if !ok {
		t.Fatalf("Payload type = %T, want model.WeatherStoryRun", out.Payload)
	}
	if !payload.AsOf.Equal(effectiveAt) {
		t.Fatalf("AsOf = %s, want fallback %s", payload.AsOf, effectiveAt)
	}
	if payload.Stories == nil {
		t.Fatalf("Stories = nil, want empty slice")
	}
	if len(payload.Stories) != 0 {
		t.Fatalf("Stories len = %d, want 0", len(payload.Stories))
	}
}

func TestWeatherStoriesNormalizerRejectsInvalidRequiredStoryTime(t *testing.T) {
	_, err := (WeatherStoriesNormalizer{}).Normalize(nil, weatherStoriesRawEvent(`{
		"stories": [{
			"officeId": "LSX",
			"startTime": "bad",
			"endTime": "2026-05-31T11:00:00+00:00",
			"updateTime": "2026-05-30T09:00:34+00:00"
		}]
	}`))
	if err == nil {
		t.Fatalf("Normalize() error = nil, want error")
	}
	if !strings.Contains(err.Error(), "stories[0].startTime") {
		t.Fatalf("error = %q, want field context", err)
	}
}

func TestWeatherStoriesNormalizerMatch(t *testing.T) {
	n := WeatherStoriesNormalizer{}
	if !n.Match(event.Event{Schema: standards.SchemaRawNWSWeatherStoriesV1}) {
		t.Fatalf("Match(raw weatherstories) = false, want true")
	}
	if n.Match(event.Event{Schema: standards.SchemaRawNWSAlertsV1}) {
		t.Fatalf("Match(raw alerts) = true, want false")
	}
}

func weatherStoriesRawEvent(payload string) event.Event {
	return event.Event{
		ID:        "evt-weatherstories-1",
		Kind:      event.Kind("weather_story"),
		Source:    "nws-weatherstories-test",
		EmittedAt: time.Date(2026, 5, 30, 9, 5, 0, 0, time.UTC),
		Schema:    standards.SchemaRawNWSWeatherStoriesV1,
		Payload:   json.RawMessage(payload),
	}
}

func weatherStoriesSamplePayload() string {
	return `{
		"stories": [
			{
				"officeId": " LSX ",
				"startTime": "2026-05-30T08:46:00+00:00",
				"endTime": "2026-05-31T11:00:00+00:00",
				"updateTime": "2026-05-30T09:00:34+00:00",
				"title": " Several Chances for Rain Through Monday ",
				"description": " A stagnant weather pattern. ",
				"altText": " This slide shows the forecast. ",
				"priority": false,
				"order": 1,
				"download": " https://api.weather.gov/offices/LSX/weatherstories/download/3228e499-2aae-45a8-9ff9-1c060311026f "
			}
		]
	}`
}