package com.restapi.domain

import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.databind.DeserializationContext
import com.fasterxml.jackson.databind.JsonDeserializer
import com.fasterxml.jackson.databind.annotation.JsonDeserialize
import io.ebean.Model
import io.ebean.annotation.*
import io.ebean.annotation.Index
import java.time.LocalDateTime
import javax.persistence.*

data class Comments(val text: String = "", val by: String = "", val at: LocalDateTime = LocalDateTime.now())

enum class ApprovalStatus {
    PENDING, APPROVED, REJECTED
}

@MappedSuperclass
abstract class BaseModel : Model() {
    @Id
    @GeneratedValue
    var sysPk: Long = 0

    @SoftDelete
    @DbDefault("false")
    var deleted: Boolean = false

    @Version
    @DbDefault("1")
    var version: Int = 0

    @WhenCreated
    @DbDefault("now()")
    var createdAt: LocalDateTime = LocalDateTime.now()

    @WhenModified
    @DbDefault("now()")
    var modifiedAt: LocalDateTime? = null


    @WhoCreated
    var createdBy: String = ""

    @WhoModified
    var modifiedBy: String? = null

    var deletedOn: LocalDateTime? = null

    var deletedBy: String? = null

    @DbDefault("0")
    var currentApprovalLevel: Int = 0

    @DbDefault("0")
    var requiredApprovalLevels: Int = 0

    @Enumerated(EnumType.STRING)
    @DbDefault("APPROVED")
    var approvalStatus: ApprovalStatus = ApprovalStatus.APPROVED

    @DbArray
    @DbDefault("{}")
    var tags: MutableList<String> = arrayListOf()

    @DbJsonB
    @DbDefault("[]")
    var comments: MutableList<Comments> = arrayListOf()
}


@MappedSuperclass
abstract class BaseTenantModel : BaseModel() {
    @TenantId
    var tenantId: String = ""
}

@Entity
open class TenantModel : BaseModel() {
    @Index(unique = true)
    var name: String = ""
    var domain: String = ""
    var mobile: List<String> = emptyList()
    var emails: List<String> = emptyList()

    @DbJsonB
    var preferences: MutableMap<String, Any> = hashMapOf()
}

enum class AuditType {
    CREATE, UPDATE, DELETE, VIEW, APPROVE, REJECT
}

@Entity
@Index(columnNames = ["audit_type", "entity", "unique_identifier", "tenant_id", "created_by"])
open class AuditLog : BaseTenantModel() {
    @Enumerated(EnumType.STRING)
    var auditType: AuditType = AuditType.CREATE

    var entity: String = ""
    var uniqueIdentifier: String = ""

    @DbJsonB
    @Index(
        definition = "create index audit_log_values_idx on audit_log using GIN (data)",
        platforms = [Platform.POSTGRES]
    )
    var data: Map<String, Any> = hashMapOf()

    @DbJsonB
    @Index(
        definition = "create index audit_log_changes_idx on audit_log using GIN (changes)",
        platforms = [Platform.POSTGRES]
    )
    var changes: Map<String, Any> = hashMapOf()
}

@Entity
open class EntityModel : BaseTenantModel() {
    @Index(unique = true)
    @JsonDeserialize(using = SafeStringDeserializer::class)
    var name: String = ""

    //a kts script that will return true/false along with errors before saving
    var preSaveScript: String? = ""

    //a kts script that will do something ... returns void
    var postSaveScript: String? = ""

    //this will create extra actions/roles in keycloak
    //the default actions are create, update, view, delete
    @DbArray
    @DbDefault("{}")
    var actions: List<String> = emptyList()

    //allow only these fields, if this is empty, then all fields are allowed
    @DbArray
    @DbDefault("{}")
    var allowedFields: List<String> = emptyList()

    //enforce field types, if this is present, only fields that are present is validated
    @DbJsonB
    @DbDefault("{}")
    var allowedFieldTypes: Map<String, String> = hashMapOf()

    //when an entity is saved/updated audit logs will be populated, when this is empty, all fields are logged
    @DbArray
    @DbDefault("{}")
    var auditLogFields: List<String> = emptyList()

    @DbJsonB
    @DbDefault("{}")
    var preferences: MutableMap<String, Any> = hashMapOf()

    //if '0' then its auto saved, no approval steps are required, for further steps,
    //a user needs to have ROLE_ENTITY_APPROVE_LEVEL1, ROLE_ENTITY_APPROVE_LEVEL2 roles for further approvals
    @DbDefault("0")
    var approvalLevels: Int = 0
}

enum class JobFrequencyType {
    SPECIFIC, EVERY, CRON
}

enum class JobType {
    SCRIPT, DB
}

@Entity
@Index(unique = true, name = "sql_unique_id", columnNames = ["entity_name", "sql_id", "tenant_id"])
open class SqlModel : BaseTenantModel() {

    @JsonDeserialize(using = SafeStringDeserializer::class)
    var sqlId: String = ""

    var entityName: String = ""

    @Column(columnDefinition = "text")
    var sql: String = ""
}

@Entity
open class JobModel : BaseTenantModel() {
    @Index(unique = true)
    var jobName: String = ""


    @Enumerated(EnumType.STRING)
    var jobType: JobType = JobType.SCRIPT
    var jobPath: String = ""

    @DbArray
    var tenants: List<String> = emptyList()

    @Enumerated(EnumType.STRING)
    var jobFrequencyType = JobFrequencyType.EVERY
    var frequency: String = "1h"

}

@Entity
@Index(unique = true, name = "entity_unique_id", columnNames = ["entity_name", "unique_identifier", "tenant_id"])
open class DataModel : BaseTenantModel() {

    @JsonDeserialize(using = SafeStringDeserializer::class)
    var uniqueIdentifier: String = ""

    @JsonDeserialize(using = SafeStringDeserializer::class)
    var entityName: String = ""

    @Index(definition = "create index data_jsonb_idx on data_model using GIN (data) ", platforms = [Platform.POSTGRES])
    @DbJsonB
    var data: MutableMap<String, Any> = hashMapOf()

}

@Entity
@Index(unique = true, name = "unique_session_id", columnNames = ["session_id"])
open class AnonSession : BaseTenantModel() {

    var sessionId: String? = null
    var ip: String? = null
    var firstSeenAt: LocalDateTime? = null
    var lastSeenAt: LocalDateTime? = null

    @DbJsonB
    var headerMap: Map<String, String> = hashMapOf()
}

class SafeStringDeserializer : JsonDeserializer<String>() {
    private val regex = Regex("^[a-zA-Z0-9\\-_\\.]+$")

    override fun deserialize(p: JsonParser, ctxt: DeserializationContext?): String {

        val text = p.text
        if (!regex.matches(text)) throw IllegalArgumentException()
        return text
    }

}