package models

import (
	"time"

	"github.com/google/uuid"
)

// Each constraint table carries the same audit/policy columns:
//   - is_hard:  true = solver must satisfy, false = soft (weighted)
//   - weight:   higher = stronger penalty when violated (used for soft constraints)
//   - active:   allows toggling a rule off without deletion
//   - note:     free-text rationale ("Lehrer X im Rollstuhl")
//   - created_by_user_id: the Rektor account that owns this rule

// ---------- Teacher constraints (6) ----------

// TeacherUnavailableDay: Lehrer kann an Wochentag NIE.
type TeacherUnavailableDay struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	DayOfWeek       int       `json:"day_of_week" db:"day_of_week"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// TeacherUnavailableWindow: Lehrer kann an Tag X von HH:MM bis HH:MM nicht.
type TeacherUnavailableWindow struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	DayOfWeek       int       `json:"day_of_week" db:"day_of_week"`
	StartTime       string    `json:"start_time" db:"start_time"`
	EndTime         string    `json:"end_time" db:"end_time"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// TeacherMaxHoursDay: Lehrer darf max. N Stunden pro Tag haben.
type TeacherMaxHoursDay struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	MaxHours        int       `json:"max_hours" db:"max_hours"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// TeacherMaxHoursWeek: Teilzeit-Cap.
type TeacherMaxHoursWeek struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	MaxHours        int       `json:"max_hours" db:"max_hours"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// TeacherExcludedSubject: Lehrer darf bestimmtes Fach nicht unterrichten.
type TeacherExcludedSubject struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// TeacherExcludedRoom: Lehrer kann Raum nicht nutzen (z.B. kein Aufzug).
type TeacherExcludedRoom struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	TeacherID       uuid.UUID `json:"teacher_id" db:"teacher_id"`
	RoomID          uuid.UUID `json:"room_id" db:"room_id"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// ---------- Subject constraints (5) ----------

// SubjectMinDayGap: Mindestens N Tage Abstand zwischen zwei Lessons desselben Fachs.
type SubjectMinDayGap struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	MinGapDays      int       `json:"min_gap_days" db:"min_gap_days"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// SubjectMaxConsecutive: Max. N aufeinander folgende Stunden des Fachs (keine Tripel-Stunde).
type SubjectMaxConsecutive struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	MaxConsecutive  int       `json:"max_consecutive" db:"max_consecutive"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// SubjectContiguousWhenRepeated: Wenn das Fach mehrfach am gleichen Tag stattfindet, dann nur als Block.
type SubjectContiguousWhenRepeated struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// SubjectPreferredPeriod: Fach lieber in einem bestimmten Period-Bereich (z.B. Hauptfächer morgens).
type SubjectPreferredPeriod struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	PeriodFrom      int       `json:"period_from" db:"period_from"`
	PeriodTo        int       `json:"period_to" db:"period_to"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// SubjectDoubleLesson: Fach bevorzugt als Doppelstunde.
type SubjectDoubleLesson struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// ---------- Class constraints (2) ----------

// ClassMaxHoursDay: Klasse darf max. N Stunden pro Tag haben.
type ClassMaxHoursDay struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	ClassID         uuid.UUID `json:"class_id" db:"class_id"`
	MaxHours        int       `json:"max_hours" db:"max_hours"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// ClassNoGaps: Keine Freistunden für die Klasse zwischen Lessons (Soft-Standard).
type ClassNoGaps struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	ClassID         uuid.UUID `json:"class_id" db:"class_id"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// ---------- Room constraints (2) ----------

// RoomRequiresType: Fach benötigt einen bestimmten Raumtyp (Sport → Sporthalle).
type RoomRequiresType struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	SubjectID       uuid.UUID `json:"subject_id" db:"subject_id"`
	RoomType        string    `json:"room_type" db:"room_type"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// RoomUnavailable: Raum an Tag X, Stunde Y blockiert (Wartung, Renovierung).
type RoomUnavailable struct {
	ID              uuid.UUID `json:"id" db:"id"`
	CreatedByUserID uuid.UUID `json:"created_by_user_id" db:"created_by_user_id"`
	RoomID          uuid.UUID `json:"room_id" db:"room_id"`
	DayOfWeek       int       `json:"day_of_week" db:"day_of_week"`
	PeriodIndex     int       `json:"period_index" db:"period_index"`
	IsHard          bool      `json:"is_hard" db:"is_hard"`
	Weight          int       `json:"weight" db:"weight"`
	Active          bool      `json:"active" db:"active"`
	Note            string    `json:"note,omitempty" db:"note"`
	CreatedAt       time.Time `json:"created_at" db:"created_at"`
}

// ---------- Request DTOs ----------

// Teacher
type CreateTeacherUnavailableDayRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	DayOfWeek int    `json:"day_of_week" binding:"required,min=1,max=7"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateTeacherUnavailableWindowRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	DayOfWeek int    `json:"day_of_week" binding:"required,min=1,max=7"`
	StartTime string `json:"start_time" binding:"required"`
	EndTime   string `json:"end_time" binding:"required"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateTeacherMaxHoursDayRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	MaxHours  int    `json:"max_hours" binding:"required,min=1,max=12"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateTeacherMaxHoursWeekRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	MaxHours  int    `json:"max_hours" binding:"required,min=1,max=40"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateTeacherExcludedSubjectRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	SubjectID string `json:"subject_id" binding:"required,uuid"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateTeacherExcludedRoomRequest struct {
	TeacherID string `json:"teacher_id" binding:"required,uuid"`
	RoomID    string `json:"room_id" binding:"required,uuid"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

// Subject
type CreateSubjectMinDayGapRequest struct {
	SubjectID  string `json:"subject_id" binding:"required,uuid"`
	MinGapDays int    `json:"min_gap_days" binding:"required,min=1,max=4"`
	IsHard     bool   `json:"is_hard"`
	Weight     int    `json:"weight" binding:"min=0,max=100"`
	Active     bool   `json:"active"`
	Note       string `json:"note"`
}

type CreateSubjectMaxConsecutiveRequest struct {
	SubjectID      string `json:"subject_id" binding:"required,uuid"`
	MaxConsecutive int    `json:"max_consecutive" binding:"required,min=1,max=5"`
	IsHard         bool   `json:"is_hard"`
	Weight         int    `json:"weight" binding:"min=0,max=100"`
	Active         bool   `json:"active"`
	Note           string `json:"note"`
}

type CreateSubjectContiguousWhenRepeatedRequest struct {
	SubjectID string `json:"subject_id" binding:"required,uuid"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateSubjectPreferredPeriodRequest struct {
	SubjectID  string `json:"subject_id" binding:"required,uuid"`
	PeriodFrom int    `json:"period_from" binding:"required,min=1,max=12"`
	PeriodTo   int    `json:"period_to" binding:"required,min=1,max=12"`
	IsHard     bool   `json:"is_hard"`
	Weight     int    `json:"weight" binding:"min=0,max=100"`
	Active     bool   `json:"active"`
	Note       string `json:"note"`
}

type CreateSubjectDoubleLessonRequest struct {
	SubjectID string `json:"subject_id" binding:"required,uuid"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

// Class
type CreateClassMaxHoursDayRequest struct {
	ClassID  string `json:"class_id" binding:"required,uuid"`
	MaxHours int    `json:"max_hours" binding:"required,min=1,max=12"`
	IsHard   bool   `json:"is_hard"`
	Weight   int    `json:"weight" binding:"min=0,max=100"`
	Active   bool   `json:"active"`
	Note     string `json:"note"`
}

type CreateClassNoGapsRequest struct {
	ClassID string `json:"class_id" binding:"required,uuid"`
	IsHard  bool   `json:"is_hard"`
	Weight  int    `json:"weight" binding:"min=0,max=100"`
	Active  bool   `json:"active"`
	Note    string `json:"note"`
}

// Room
type CreateRoomRequiresTypeRequest struct {
	SubjectID string `json:"subject_id" binding:"required,uuid"`
	RoomType  string `json:"room_type" binding:"required"`
	IsHard    bool   `json:"is_hard"`
	Weight    int    `json:"weight" binding:"min=0,max=100"`
	Active    bool   `json:"active"`
	Note      string `json:"note"`
}

type CreateRoomUnavailableRequest struct {
	RoomID      string `json:"room_id" binding:"required,uuid"`
	DayOfWeek   int    `json:"day_of_week" binding:"required,min=1,max=7"`
	PeriodIndex int    `json:"period_index" binding:"required,min=1,max=12"`
	IsHard      bool   `json:"is_hard"`
	Weight      int    `json:"weight" binding:"min=0,max=100"`
	Active      bool   `json:"active"`
	Note        string `json:"note"`
}