package classes_test

import (
	"context"
	"errors"
	"testing"

	"git.golem15.com/jakub/sm-bm-plugin/classes"
	"gorm.io/gorm"
)

// members is an injected group check: user 7 is in studenci, user 9 is in
// moderatorzy only, user 13 makes the check fail.
func members(_ context.Context, _ *gorm.DB, userID uint, group string) (bool, error) {
	switch {
	case userID == 13:
		return false, errors.New("database down")
	case group == "studenci":
		return userID == 7, nil
	case group == "moderatorzy":
		return userID == 9 || userID == 7, nil
	}
	return false, nil
}

func TestChatAccess(t *testing.T) {
	db := func() *gorm.DB { return &gorm.DB{} }
	access := classes.NewChatAccess(db, "studenci", members)
	ctx := t.Context()
	for _, c := range []struct {
		name        string
		userID      uint
		contextType string
		contextID   uint
		want        bool
	}{
		{"member of bm/1", 7, "bm", 1, true},
		{"other context type", 7, "channel", 1, false},
		{"other context id", 7, "bm", 2, false},
		{"non-member", 8, "bm", 1, false},
		{"moderator only", 9, "bm", 1, false},
		{"check fails", 13, "bm", 1, false},
		{"no user", 0, "bm", 1, false},
	} {
		if got := access.CanAccessContext(ctx, c.userID, c.contextType, c.contextID); got != c.want {
			t.Errorf("%s: CanAccessContext = %v, want %v", c.name, got, c.want)
		}
		if access.CanManageContext(ctx, c.userID, c.contextType, c.contextID) {
			t.Errorf("%s: CanManageContext = true; nobody creates channels", c.name)
		}
	}
	noDB := classes.NewChatAccess(func() *gorm.DB { return nil }, "studenci", members)
	if noDB.CanAccessContext(ctx, 7, "bm", 1) {
		t.Error("CanAccessContext without a database = true, want false")
	}
	nilFunc := classes.NewChatAccess(nil, "studenci", members)
	if nilFunc.CanAccessContext(ctx, 7, "bm", 1) {
		t.Error("CanAccessContext without a database func = true, want false")
	}
	noGroup := classes.NewChatAccess(db, "", members)
	if noGroup.CanAccessContext(ctx, 7, "bm", 1) {
		t.Error("CanAccessContext without a chat group = true, want false")
	}
}

func TestChatContext(t *testing.T) {
	ctx := t.Context()
	c := classes.NewChatContext(&gorm.DB{}, "studenci", "moderatorzy").WithMembership(members)
	if c.ID() != classes.ChatContextID || c.ID() != 1 || c.Type() != "bm" {
		t.Errorf("context = %s/%d, want bm/1", c.Type(), c.ID())
	}
	if !c.ChatEnabled() || c.GroupName() != "ogólny" {
		t.Errorf("ChatEnabled %v GroupName %q", c.ChatEnabled(), c.GroupName())
	}
	if c.BroadcastChannel() != "chat:context:1" {
		t.Errorf("BroadcastChannel = %q, want chat:context:1", c.BroadcastChannel())
	}
	for _, id := range []uint{7, 9, 8} {
		if ok, err := c.CanOverseeChats(ctx, id); ok || err != nil {
			t.Errorf("CanOverseeChats(%d) = %v, %v; nobody oversees", id, ok, err)
		}
	}
	if ok, err := c.HasMember(ctx, 7); !ok || err != nil {
		t.Errorf("HasMember(7) = %v, %v, want true", ok, err)
	}
	if ok, err := c.HasMember(ctx, 9); ok || err != nil {
		t.Errorf("HasMember(9) = %v, %v, want false (moderator group only)", ok, err)
	}
	if ok, _ := c.HasMember(ctx, 0); ok {
		t.Error("HasMember(0) = true")
	}
	if _, err := c.HasMember(ctx, 13); err == nil {
		t.Error("HasMember with a failing check returned no error")
	}
	if !c.CanActFor(ctx, 7, 7) || c.CanActFor(ctx, 7, 8) {
		t.Error("CanActFor is not self-only")
	}

	load := classes.ChatContextLoader(func() string { return "studenci" }, func() string { return "moderatorzy" })
	if got, err := load(ctx, &gorm.DB{}, 2); got != nil || err != nil {
		t.Errorf("loader(2) = %v, %v, want nil, nil", got, err)
	}
	got, err := load(ctx, &gorm.DB{}, 1)
	if err != nil || got == nil || got.ID() != 1 || got.Type() != "bm" {
		t.Errorf("loader(1) = %v, %v, want the bm/1 context", got, err)
	}
}