package agzam.vyatsu.data.local

import androidx.room.Dao
import androidx.room.Insert
import androidx.room.OnConflictStrategy
import androidx.room.Query
import kotlinx.coroutines.flow.Flow

@Dao
interface TeacherDao {
    @Query("SELECT * FROM departments ORDER BY name")
    fun observeDepartments(): Flow<List<DepartmentEntity>>

    @Query("SELECT * FROM departments WHERE departmentId = :id")
    suspend fun getDepartment(id: String): DepartmentEntity?

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertAll(departments: List<DepartmentEntity>)

    @Query("SELECT MAX(lastSyncedAt) FROM departments")
    suspend fun maxSyncedAt(): Long?

    @Query("SELECT DISTINCT faculty FROM departments ORDER BY faculty")
    suspend fun getFaculties(): List<String>

    @Query("DELETE FROM department_periods")
    suspend fun deleteAllPeriods()

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertPeriods(periods: List<DepartmentPeriodEntity>)

    @Query(
        "SELECT * FROM department_periods WHERE weekStart <= :epochDay AND weekEnd >= :epochDay ORDER BY departmentId"
    )
    suspend fun getPeriodsForDate(epochDay: Long): List<DepartmentPeriodEntity>

    @Query("SELECT * FROM department_periods WHERE departmentId = :departmentId ORDER BY weekStart")
    suspend fun getPeriodsForDepartment(departmentId: String): List<DepartmentPeriodEntity>
}