package findatender

import (
	"context"
	"errors"
	"io"
	"net/http"
	"slices"
	"strings"
	"testing"
	"time"

	"git.avsdev.uk/Go/job-search/internal/types"
)

func TestNew(t *testing.T) {
	conf := testConfig("warn")
	ft := New(conf, "https://example/api")
	defer ft.Shutdown()

	if ft.config != conf || ft.apiRoot != "https://example/api" {
		t.Errorf("New did not keep its arguments: %+v", ft)
	}
	if ft.httpClient == nil {
		t.Fatal("no http client")
	}
	if ft.httpClient.Timeout() != 60*time.Second ||
		ft.httpClient.RetryCount() != 1 {
		t.Errorf(
			"client timeout %v, retries %d",
			ft.httpClient.Timeout(),
			ft.httpClient.RetryCount(),
		)
	}
	if ft.ctx != nil {
		t.Error("New should not set a context")
	}
}

func TestReloadConfig(t *testing.T) {
	ft := New(testConfig("warn"), "")
	defer ft.Shutdown()
	conf := testConfig("debug")
	ft.ReloadConfig(conf)
	if ft.config != conf {
		t.Error("config not replaced")
	}
}

func TestWith(t *testing.T) {
	ft := New(testConfig("warn"), "")
	defer ft.Shutdown()

	// Passing nil on purpose to test that case.
	//nolint:staticcheck // SA1012
	if got := ft.With(nil); got != ft {
		t.Error("With(nil) should return the receiver")
	}

	type key struct{}
	ctx := context.WithValue(context.Background(), key{}, "v")
	got := ft.With(ctx)
	if got == ft {
		t.Fatal("With should return a copy")
	}
	if got.ctx != ctx {
		t.Error("copy does not carry the context")
	}
	if ft.ctx != nil {
		t.Error("With changed the original")
	}
	if got.httpClient != ft.httpClient || got.config != ft.config {
		t.Error("copy should share the client and config")
	}
}

func opportunityIDs(ops []*types.Opportunity) []string {
	var ids []string
	for _, op := range ops {
		ids = append(ids, op.UUID)
	}
	slices.Sort(ids)
	return ids
}

func TestFetchOncePublic(t *testing.T) {
	ft, _ := pagedServer(
		t,
		[]string{
			releaseJSON("ocds-1", "1"),
			releaseJSON("ocds-1", "2"),
			releaseJSON("ocds-2", "1"),
		},
		[]string{releaseJSON("ocds-3", "1")},
	)
	ops, err := ft.FetchOnce(time.Now(), false)
	if err != nil {
		t.Fatal(err)
	}
	if got := strings.Join(opportunityIDs(ops), ","); got != "ocds-1,ocds-2" {
		t.Errorf("opportunities = %s", got)
	}

	ft, _ = pagedServer(t, []string{})
	if _, err := ft.FetchOnce(time.Now(), false); !errors.Is(err, ErrNoReleases) {
		t.Errorf("err = %v, want ErrNoReleases", err)
	}
}

func TestFetchAllPublic(t *testing.T) {
	ft, _ := pagedServer(
		t,
		[]string{releaseJSON("ocds-1", "1"), releaseJSON("ocds-2", "1")},
		[]string{releaseJSON("ocds-1", "2"), releaseJSON("ocds-3", "1")},
	)
	ops, err := ft.FetchAll(time.Now(), false)
	if err != nil {
		t.Fatal(err)
	}
	if got := strings.Join(
		opportunityIDs(ops), ",",
	); got != "ocds-1,ocds-2,ocds-3" {
		t.Errorf("opportunities = %s", got)
	}
	for _, op := range ops {
		if op.UUID == "ocds-1" && len(op.Releases) != 2 {
			t.Errorf("ocds-1 has %d releases, want 2", len(op.Releases))
		}
	}

	ft, _ = newTestFT(t, "warn", func(w http.ResponseWriter, r *http.Request) {
		io.WriteString(w, "not json")
	})
	if _, err := ft.FetchAll(time.Now(), false); err == nil {
		t.Error("expected an error")
	}
}