package models

import (
	"time"

	"github.com/google/uuid"
)

// TimetableSolution is one run of the solver — exactly one row per solve.
// Lessons attached via tt_lesson.solution_id.
type TimetableSolution struct {
	ID               uuid.UUID  `json:"id" db:"id"`
	CreatedByUserID  uuid.UUID  `json:"created_by_user_id" db:"created_by_user_id"`
	Name             string     `json:"name,omitempty" db:"name"`
	Status           string     `json:"status" db:"status"`
	HardScore        *int       `json:"hard_score,omitempty" db:"hard_score"`
	SoftScore        *int       `json:"soft_score,omitempty" db:"soft_score"`
	ErrorMessage     string     `json:"error_message,omitempty" db:"error_message"`
	StartedAt        *time.Time `json:"started_at,omitempty" db:"started_at"`
	FinishedAt       *time.Time `json:"finished_at,omitempty" db:"finished_at"`
	CreatedAt        time.Time  `json:"created_at" db:"created_at"`
	ParentSolutionID *uuid.UUID `json:"parent_solution_id,omitempty" db:"parent_solution_id"`
	SecondsLimit     *int       `json:"seconds_limit,omitempty" db:"seconds_limit"`
}

// TimetableLesson is one scheduled class-period in a solution.
type TimetableLesson struct {
	ID          uuid.UUID  `json:"id" db:"id"`
	SolutionID  uuid.UUID  `json:"solution_id" db:"solution_id"`
	ClassID     uuid.UUID  `json:"class_id" db:"class_id"`
	SubjectID   uuid.UUID  `json:"subject_id" db:"subject_id"`
	TeacherID   uuid.UUID  `json:"teacher_id" db:"teacher_id"`
	RoomID      *uuid.UUID `json:"room_id,omitempty" db:"room_id"`
	DayOfWeek   int        `json:"day_of_week" db:"day_of_week"`
	PeriodIndex int        `json:"period_index" db:"period_index"`
	Pinned      bool       `json:"pinned" db:"pinned"`
	CreatedAt   time.Time  `json:"created_at" db:"created_at"`

	// Joined fields for display
	ClassName   string `json:"class_name,omitempty"`
	SubjectName string `json:"subject_name,omitempty"`
	TeacherName string `json:"teacher_name,omitempty"`
	RoomName    string `json:"room_name,omitempty"`
}

// CreateTimetableSolutionRequest kicks off a solve. The solver-service is
// invoked async — this endpoint only registers the solution row and queues
// the job.
//
// ParentSolutionID, if set, instructs the solver to seed the new problem
// with the parent solution's pinned lessons (Phase 7 plan versioning).
// SecondsLimit overrides the default 60s solver budget.
type CreateTimetableSolutionRequest struct {
	Name             string  `json:"name"`
	ParentSolutionID *string `json:"parent_solution_id,omitempty" binding:"omitempty,uuid"`
	SecondsLimit     *int    `json:"seconds_limit,omitempty" binding:"omitempty,min=5,max=600"`
}

// UpdateLessonPinRequest toggles tt_lesson.pinned. Used by the Plan view's
// pin/unpin button.
type UpdateLessonPinRequest struct {
	Pinned bool `json:"pinned"`
}