package report

import (
	"strings"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
)

func TestResolveRetainedReportPeriods(t *testing.T) {
	location := loadTestLocation(t)
	now := parseTestTime("2026-05-29T17:45:00-05:00")
	date := parseTestTime("2026-05-31T12:00:00-05:00")

	tests := []struct {
		id        ID
		request   ResolveRequest
		wantStart string
		wantEnd   string
	}{
		{Daily, ResolveRequest{Now: now, Location: location, Date: date}, "2026-05-31T00:00:00-05:00", "2026-06-01T00:00:00-05:00"},
		{Today, ResolveRequest{Now: now, Location: location, Date: date}, "2026-05-31T00:00:00-05:00", "2026-06-01T00:00:00-05:00"},
		{Tomorrow, ResolveRequest{Now: now, Location: location}, "2026-05-30T00:00:00-05:00", "2026-05-31T00:00:00-05:00"},
		{Hourly, ResolveRequest{Now: now, Location: location}, "2026-05-29T17:45:00-05:00", "2026-05-29T23:45:00-05:00"},
	}

	for _, tt := range tests {
		t.Run(string(tt.id), func(t *testing.T) {
			resolved, err := Resolve(tt.id, tt.request)
			if err != nil {
				t.Fatalf("Resolve(%q) error = %v", tt.id, err)
			}
			assertTestPeriod(t, resolved.ValidPeriod, tt.wantStart, tt.wantEnd)
		})
	}
}

func TestResolveDailyRequiresDate(t *testing.T) {
	_, err := Resolve(Daily, ResolveRequest{Now: parseTestTime("2026-05-29T17:45:00-05:00"), Location: loadTestLocation(t)})
	if err == nil || !strings.Contains(err.Error(), "explicit date") {
		t.Fatalf("Resolve(Daily) error = %v, want explicit-date error", err)
	}
}

func TestRegistryContainsOnlyPromptBackedReports(t *testing.T) {
	registry := DefaultRegistry()
	definitions := registry.All()
	if len(definitions) != 4 {
		t.Fatalf("Registry.All() length = %d, want 4", len(definitions))
	}

	for _, definition := range definitions {
		if definition.PromptVersion != "2.0.0" {
			t.Fatalf("%s PromptVersion = %q, want 2.0.0", definition.ID, definition.PromptVersion)
		}
		if definition.PromptID == "" {
			t.Fatalf("%s PromptID is empty", definition.ID)
		}
		if definition.TemplateID == "" || definition.GeneratedTextSchemaID == "" {
			t.Fatalf("%s template/schema = %q/%q, want both set", definition.ID, definition.TemplateID, definition.GeneratedTextSchemaID)
		}
	}

	if _, err := registry.Lookup(ID("three_day")); err == nil {
		t.Fatal("Lookup(three_day) error = nil, want unknown report")
	}
}

func TestCommandAndConfigurationNamesRejectRetiredReports(t *testing.T) {
	if names := strings.Join(CommandNames(), ","); names != "daily,today,tomorrow,hourly" {
		t.Fatalf("CommandNames() = %q", names)
	}

	for _, name := range []string{"three-day", "weekend", "storm"} {
		if _, err := IDForCommandName(name); err == nil {
			t.Fatalf("IDForCommandName(%q) error = nil, want unknown command", name)
		}
	}
	for _, key := range []string{"three_day", "three_day_outlook", "weekend", "weekend_outlook", "storm", "storm_report"} {
		if _, err := IDForConfigKey(key); err == nil {
			t.Fatalf("IDForConfigKey(%q) error = nil, want unknown report", key)
		}
	}
}

func TestRegistryDefinitionsPreserveRetainedContracts(t *testing.T) {
	tests := []struct {
		id         ID
		morning    bool
		evening    bool
		outputName string
		paths      []string
	}{
		{Daily, false, false, "daily.md", []string{"daily/{valid_start_date}/{run_id}.md", "daily/{valid_start_date}/index.md"}},
		{Today, true, false, "today.md", []string{"daily/{valid_start_date}/{run_id}.md", "daily/{valid_start_date}/index.md", "today/index.md"}},
		{Tomorrow, false, true, "tomorrow.md", []string{"daily/{valid_start_date}/{run_id}.md", "daily/{valid_start_date}/index.md", "tomorrow/index.md"}},
		{Hourly, false, false, "hourly.md", []string{"hourly/index.md"}},
	}

	registry := DefaultRegistry()
	for _, tt := range tests {
		t.Run(string(tt.id), func(t *testing.T) {
			definition := registry.MustLookup(tt.id)
			if definition.Morning != tt.morning || definition.Evening != tt.evening || definition.OutputName != tt.outputName {
				t.Fatalf("definition = %#v, want retained report contract", definition)
			}
			if strings.Join(definition.DistributorPathTemplates, "|") != strings.Join(tt.paths, "|") {
				t.Fatalf("DistributorPathTemplates = %#v, want %#v", definition.DistributorPathTemplates, tt.paths)
			}
		})
	}
}

func assertTestPeriod(t *testing.T, period timeutil.Period, wantStart string, wantEnd string) {
	t.Helper()
	if got := period.Start.Format(time.RFC3339); got != wantStart {
		t.Fatalf("period start = %q, want %q", got, wantStart)
	}
	if got := period.End.Format(time.RFC3339); got != wantEnd {
		t.Fatalf("period end = %q, want %q", got, wantEnd)
	}
}

func loadTestLocation(t *testing.T) *time.Location {
	t.Helper()
	location, err := timeutil.LoadLocation("America/Chicago")
	if err != nil {
		t.Fatalf("LoadLocation() error = %v", err)
	}
	return location
}

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