package services

import (
	"testing"

	"github.com/breakpilot/school-service/internal/models"
)

// Additional validator tests covering the 9 constraint DTOs not exercised in
// timetable_constraints_test.go. Each entry probes both the happy path and
// the boundary that the binding tags are supposed to reject.

const (
	uidTeacher = "00000000-0000-0000-0000-0000000000a1"
	uidSubject = "00000000-0000-0000-0000-0000000000a2"
	uidClass   = "00000000-0000-0000-0000-0000000000a3"
	uidRoom    = "00000000-0000-0000-0000-0000000000a4"
)

func TestCreateTeacherMaxHoursDayRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateTeacherMaxHoursDayRequest
		wantErr bool
	}{
		{"valid", models.CreateTeacherMaxHoursDayRequest{TeacherID: uidTeacher, MaxHours: 6, IsHard: false, Weight: 50}, false},
		{"missing teacher", models.CreateTeacherMaxHoursDayRequest{MaxHours: 6}, true},
		{"hours below 1", models.CreateTeacherMaxHoursDayRequest{TeacherID: uidTeacher, MaxHours: 0}, true},
		{"hours above 12", models.CreateTeacherMaxHoursDayRequest{TeacherID: uidTeacher, MaxHours: 13}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateTeacherMaxHoursWeekRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateTeacherMaxHoursWeekRequest
		wantErr bool
	}{
		{"valid", models.CreateTeacherMaxHoursWeekRequest{TeacherID: uidTeacher, MaxHours: 28, IsHard: true, Weight: 100}, false},
		{"hours below 1", models.CreateTeacherMaxHoursWeekRequest{TeacherID: uidTeacher, MaxHours: 0}, true},
		{"hours above 40", models.CreateTeacherMaxHoursWeekRequest{TeacherID: uidTeacher, MaxHours: 41}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateTeacherExcludedSubjectRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateTeacherExcludedSubjectRequest
		wantErr bool
	}{
		{"valid", models.CreateTeacherExcludedSubjectRequest{TeacherID: uidTeacher, SubjectID: uidSubject, IsHard: true, Weight: 100}, false},
		{"missing subject", models.CreateTeacherExcludedSubjectRequest{TeacherID: uidTeacher}, true},
		{"non-uuid subject", models.CreateTeacherExcludedSubjectRequest{TeacherID: uidTeacher, SubjectID: "nope"}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateTeacherExcludedRoomRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateTeacherExcludedRoomRequest
		wantErr bool
	}{
		{"valid", models.CreateTeacherExcludedRoomRequest{TeacherID: uidTeacher, RoomID: uidRoom, IsHard: true, Weight: 100}, false},
		{"missing room", models.CreateTeacherExcludedRoomRequest{TeacherID: uidTeacher}, true},
		{"non-uuid room", models.CreateTeacherExcludedRoomRequest{TeacherID: uidTeacher, RoomID: "nope"}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateSubjectMinDayGapRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateSubjectMinDayGapRequest
		wantErr bool
	}{
		{"valid", models.CreateSubjectMinDayGapRequest{SubjectID: uidSubject, MinGapDays: 1, IsHard: false, Weight: 70}, false},
		{"below 1", models.CreateSubjectMinDayGapRequest{SubjectID: uidSubject, MinGapDays: 0}, true},
		{"above 4", models.CreateSubjectMinDayGapRequest{SubjectID: uidSubject, MinGapDays: 5}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateSubjectContiguousWhenRepeatedRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateSubjectContiguousWhenRepeatedRequest
		wantErr bool
	}{
		{"valid", models.CreateSubjectContiguousWhenRepeatedRequest{SubjectID: uidSubject, IsHard: true, Weight: 100}, false},
		{"missing subject", models.CreateSubjectContiguousWhenRepeatedRequest{}, true},
		{"weight above 100", models.CreateSubjectContiguousWhenRepeatedRequest{SubjectID: uidSubject, Weight: 200}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateSubjectDoubleLessonRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateSubjectDoubleLessonRequest
		wantErr bool
	}{
		{"valid", models.CreateSubjectDoubleLessonRequest{SubjectID: uidSubject, IsHard: false, Weight: 60}, false},
		{"missing subject", models.CreateSubjectDoubleLessonRequest{}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateClassNoGapsRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateClassNoGapsRequest
		wantErr bool
	}{
		{"valid", models.CreateClassNoGapsRequest{ClassID: uidClass, IsHard: false, Weight: 80}, false},
		{"missing class", models.CreateClassNoGapsRequest{}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}

func TestCreateRoomRequiresTypeRequest_Validation(t *testing.T) {
	tests := []struct {
		name    string
		req     models.CreateRoomRequiresTypeRequest
		wantErr bool
	}{
		{"valid", models.CreateRoomRequiresTypeRequest{SubjectID: uidSubject, RoomType: "Sporthalle", IsHard: true, Weight: 100}, false},
		{"missing room type", models.CreateRoomRequiresTypeRequest{SubjectID: uidSubject}, true},
		{"non-uuid subject", models.CreateRoomRequiresTypeRequest{SubjectID: "x", RoomType: "y"}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if (validate.Struct(tt.req) != nil) != tt.wantErr {
				t.Errorf("unexpected validation outcome")
			}
		})
	}
}