package app

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
)

func TestFetchAndSaveBundle(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/observations":
			_, _ = w.Write([]byte(`{"data":{"timestamp":"2026-05-29T14:00:00Z","conditionCode":3}}`))
		case "/conditions/current":
			_, _ = w.Write([]byte(`{"data":{"conditionText":"Clear"}}`))
		case "/forecast/hourly":
			_, _ = w.Write([]byte(`{"data":{"issuedAt":"2026-05-29T10:30:00-05:00","product":"hourly","periods":[{"startTime":"2026-05-29T13:00:00-05:00","endTime":"2026-05-29T14:00:00-05:00"}]}}`))
		case "/forecast/narrative":
			_, _ = w.Write([]byte(`{"data":{"issuedAt":"2026-05-29T10:30:00-05:00","product":"narrative","periods":[]}}`))
		case "/alerts/active":
			_, _ = w.Write([]byte(`{"data":{"alerts":[]}}`))
		case "/discussion":
			_, _ = w.Write([]byte(`{"data":{"product":"discussion","issuedAt":"2026-05-29T09:25:00-05:00","keyMessages":[]}}`))
		default:
			http.NotFound(w, r)
		}
	}))
	defer server.Close()

	cfg := config.Defaults()
	cfg.WeatherAPI.BaseURL = server.URL + "/"
	path := filepath.Join(t.TempDir(), "bundle.json")

	bundle, err := FetchAndSaveBundle(context.Background(), FetchBundleRequest{Config: cfg, OutputPath: path})
	if err != nil {
		t.Fatalf("FetchAndSaveBundle() error = %v", err)
	}
	if bundle.Hourly == nil {
		t.Fatal("Hourly = nil, want fetched bundle")
	}
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("read saved bundle: %v", err)
	}
	if !strings.Contains(string(data), `"product": "hourly"`) {
		t.Fatalf("saved bundle missing hourly product:\n%s", string(data))
	}
}

func TestFetchAndSaveBundleRequiresOutputPath(t *testing.T) {
	_, err := FetchAndSaveBundle(context.Background(), FetchBundleRequest{Config: config.Defaults()})
	if err == nil {
		t.Fatal("FetchAndSaveBundle() error = nil, want output path error")
	}
	if !strings.Contains(err.Error(), "output path") {
		t.Fatalf("error = %q, want output path context", err.Error())
	}
}

func TestResolveGenerateMapsCommandToReportDefinition(t *testing.T) {
	cfg := config.Defaults()
	cfg.WeatherAPI.Timezone = "America/Chicago"
	now := mustParse("2026-05-29T18:00:00-05:00")

	resolved, err := ResolveGenerate(GenerateRequest{
		Config: cfg,
		Report: ReportTomorrow,
	}, now)
	if err != nil {
		t.Fatalf("ResolveGenerate() error = %v", err)
	}
	if resolved.Definition.ID != report.DailyTomorrow {
		t.Fatalf("ID = %q, want daily_tomorrow", resolved.Definition.ID)
	}
	if resolved.Definition.PromptID != "weather.daily_report" {
		t.Fatalf("PromptID = %q, want weather.daily_report", resolved.Definition.PromptID)
	}
	if got := resolved.ValidPeriod.Start.Format("2006-01-02"); got != "2026-05-30" {
		t.Fatalf("valid start date = %s, want 2026-05-30", got)
	}
}

func TestResolveGenerateStorm(t *testing.T) {
	cfg := config.Defaults()
	cfg.WeatherAPI.Timezone = "America/Chicago"
	now := mustParse("2026-05-29T12:00:00-05:00")
	start := mustParse("2026-05-29T18:00:00-05:00")
	end := mustParse("2026-05-30T06:00:00-05:00")

	resolved, err := ResolveGenerate(GenerateRequest{
		Config:     cfg,
		Report:     ReportStorm,
		StormStart: start,
		StormEnd:   end,
	}, now)
	if err != nil {
		t.Fatalf("ResolveGenerate() error = %v", err)
	}
	if resolved.Definition.ID != report.Storm {
		t.Fatalf("ID = %q, want storm", resolved.Definition.ID)
	}
	if !resolved.ValidPeriod.Start.Equal(start) || !resolved.ValidPeriod.End.Equal(end) {
		t.Fatalf("period = %#v, want storm window", resolved.ValidPeriod)
	}
}

func TestResolveBatchMorningSkipsWeekendOnSunday(t *testing.T) {
	cfg := config.Defaults()
	cfg.WeatherAPI.Timezone = "America/Chicago"
	now := mustParse("2026-05-31T06:00:00-05:00")

	resolved, err := ResolveBatch(BatchRequest{Config: cfg, Batch: BatchMorning}, now)
	if err != nil {
		t.Fatalf("ResolveBatch() error = %v", err)
	}
	if len(resolved) != 2 {
		t.Fatalf("resolved length = %d, want 2", len(resolved))
	}
	for _, item := range resolved {
		if item.Definition.ID == report.Weekend {
			t.Fatal("morning batch included weekend on Sunday")
		}
	}
}

func mustParse(value string) time.Time {
	parsed, err := time.Parse(time.RFC3339, value)
	if err != nil {
		panic(err)
	}
	return parsed
}