//go:build integration

package httpcache_test

import (
	"encoding/json"
	"os"
	"path/filepath"
	"testing"

	"github.com/therootcompany/golib/net/httpcache"
)

var inboundSources = []struct {
	name string
	url  string
}{
	{
		"inbound_single_ips",
		"https://github.com/bitwire-it/ipblocklist/raw/refs/heads/main/tables/inbound/single_ips.txt",
	},
	{
		"inbound_networks",
		"https://github.com/bitwire-it/ipblocklist/raw/refs/heads/main/tables/inbound/networks.txt",
	},
}

func testdataDir(t *testing.T) string {
	t.Helper()
	dir, _ := filepath.Abs(".")
	for {
		if _, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil {
			return filepath.Join(dir, "testdata")
		}
		parent := filepath.Dir(dir)
		if parent == dir {
			t.Fatal("could not find module root (go.mod)")
		}
		dir = parent
	}
}

func TestCacher_Download(t *testing.T) {
	for _, src := range inboundSources {
		t.Run(src.name, func(t *testing.T) {
			path := filepath.Join(testdataDir(t), src.name+".txt")
			os.Remove(path)
			os.Remove(path + ".meta")

			c := httpcache.New(src.url, path)
			updated, err := c.Fetch()
			if err != nil {
				t.Fatalf("Fetch: %v", err)
			}
			if !updated {
				t.Error("first Fetch: expected updated=true")
			}
			info, err := os.Stat(path)
			if err != nil {
				t.Fatalf("file not created: %v", err)
			}
			if info.Size() == 0 {
				t.Error("downloaded file is empty")
			}
			t.Logf("downloaded %d bytes to %s", info.Size(), path)
		})
	}
}

func TestCacher_SidecarWritten(t *testing.T) {
	for _, src := range inboundSources {
		t.Run(src.name, func(t *testing.T) {
			path := filepath.Join(testdataDir(t), src.name+".txt")
			os.Remove(path)
			os.Remove(path + ".meta")

			c := httpcache.New(src.url, path)
			if _, err := c.Fetch(); err != nil {
				t.Fatalf("Fetch: %v", err)
			}

			data, err := os.ReadFile(path + ".meta")
			if err != nil {
				t.Fatalf("sidecar not written: %v", err)
			}
			var meta map[string]string
			if err := json.Unmarshal(data, &meta); err != nil {
				t.Fatalf("sidecar not valid JSON: %v", err)
			}
			if meta["etag"] == "" && meta["last_modified"] == "" {
				t.Error("sidecar has neither etag nor last_modified")
			}
			t.Logf("sidecar: %s", data)
		})
	}
}

func TestCacher_ConditionalGet_SameCacher(t *testing.T) {
	for _, src := range inboundSources {
		t.Run(src.name, func(t *testing.T) {
			path := filepath.Join(testdataDir(t), src.name+".txt")

			c := httpcache.New(src.url, path)
			if _, err := c.Fetch(); err != nil {
				t.Fatalf("initial Fetch: %v", err)
			}

			updated, err := c.Fetch()
			if err != nil {
				t.Fatalf("second Fetch: %v", err)
			}
			if updated {
				t.Error("second Fetch on same cacher: expected updated=false")
			}
			t.Log("same-cacher conditional GET correctly skipped re-download")
		})
	}
}

func TestCacher_ConditionalGet_FreshCacher(t *testing.T) {
	for _, src := range inboundSources {
		t.Run(src.name, func(t *testing.T) {
			path := filepath.Join(testdataDir(t), src.name+".txt")

			first := httpcache.New(src.url, path)
			if _, err := first.Fetch(); err != nil {
				t.Fatalf("initial Fetch: %v", err)
			}
			if _, err := os.Stat(path + ".meta"); err != nil {
				t.Fatalf("sidecar missing after first fetch: %v", err)
			}

			// New Cacher with no in-memory state — must read sidecar.
			fresh := httpcache.New(src.url, path)
			updated, err := fresh.Fetch()
			if err != nil {
				t.Fatalf("fresh-cacher Fetch: %v", err)
			}
			if updated {
				t.Error("fresh-cacher Fetch: expected updated=false (sidecar should have provided ETag)")
			}
			t.Log("fresh-cacher conditional GET correctly used sidecar ETag")
		})
	}
}