package sources

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"gitea.maximumdirect.net/ejr/feedkit/config"
)

func TestNewHTTPSourceConditionalDefaultsTrue(t *testing.T) {
	src, err := NewHTTPSource("test_driver", config.SourceConfig{
		Name:   "test-source",
		Driver: "test_driver",
		Params: map[string]any{
			"url":        "https://example.invalid",
			"user_agent": "test-agent",
		},
	}, "application/json")
	if err != nil {
		t.Fatalf("NewHTTPSource() error = %v", err)
	}
	if !src.Conditional {
		t.Fatalf("Conditional = false, want true")
	}
}

func TestNewHTTPSourceRejectsInvalidConditional(t *testing.T) {
	_, err := NewHTTPSource("test_driver", config.SourceConfig{
		Name:   "test-source",
		Driver: "test_driver",
		Params: map[string]any{
			"url":         "https://example.invalid",
			"user_agent":  "test-agent",
			"conditional": "sometimes",
		},
	}, "application/json")
	if err == nil {
		t.Fatalf("NewHTTPSource() error = nil, want error")
	}
	if !strings.Contains(err.Error(), "params.conditional must be a boolean") {
		t.Fatalf("NewHTTPSource() error = %q, want params.conditional must be a boolean", err)
	}
}

func TestNewHTTPSourceConditionalCanBeExplicitlyFalse(t *testing.T) {
	src, err := NewHTTPSource("test_driver", config.SourceConfig{
		Name:   "test-source",
		Driver: "test_driver",
		Params: map[string]any{
			"url":         "https://example.invalid",
			"user_agent":  "test-agent",
			"conditional": false,
		},
	}, "application/json")
	if err != nil {
		t.Fatalf("NewHTTPSource() error = %v", err)
	}
	if src.Conditional {
		t.Fatalf("Conditional = true, want false")
	}
}

func TestHTTPSourceFetchJSONIfChanged(t *testing.T) {
	var call int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		call++
		switch call {
		case 1:
			w.Header().Set("ETag", `"v1"`)
			_, _ = w.Write([]byte(`{"ok":true}`))
		case 2:
			if got := r.Header.Get("If-None-Match"); got != `"v1"` {
				t.Fatalf("second request If-None-Match = %q", got)
			}
			w.WriteHeader(http.StatusNotModified)
		default:
			t.Fatalf("unexpected call count %d", call)
		}
	}))
	defer srv.Close()

	src, err := NewHTTPSource("test_driver", config.SourceConfig{
		Name:   "test-source",
		Driver: "test_driver",
		Params: map[string]any{
			"url":        srv.URL,
			"user_agent": "test-agent",
		},
	}, "application/json")
	if err != nil {
		t.Fatalf("NewHTTPSource() error = %v", err)
	}

	raw, changed, err := src.FetchJSONIfChanged(context.Background())
	if err != nil {
		t.Fatalf("first FetchJSONIfChanged() error = %v", err)
	}
	if !changed {
		t.Fatalf("first FetchJSONIfChanged() changed = false, want true")
	}
	if got := string(raw); got != `{"ok":true}` {
		t.Fatalf("first FetchJSONIfChanged() body = %q", got)
	}

	raw, changed, err = src.FetchJSONIfChanged(context.Background())
	if err != nil {
		t.Fatalf("second FetchJSONIfChanged() error = %v", err)
	}
	if changed {
		t.Fatalf("second FetchJSONIfChanged() changed = true, want false")
	}
	if raw != nil {
		t.Fatalf("second FetchJSONIfChanged() body = %q, want nil", string(raw))
	}
}