use sea_orm_migration::prelude::*;

#[derive(DeriveMigrationName)]
pub struct Migration;

#[async_trait::async_trait]
impl MigrationTrait for Migration {
    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .create_table(
                Table::create()
                    .table(Tasks::Table)
                    .if_not_exists()
                    .col(
                        ColumnDef::new(Tasks::Id)
                            .uuid()
                            .not_null()
                            .primary_key(),
                    )
                    .col(ColumnDef::new(Tasks::TenantId).uuid().not_null())
                    .col(ColumnDef::new(Tasks::InstanceId).uuid().not_null())
                    .col(ColumnDef::new(Tasks::TokenId).uuid().not_null())
                    .col(ColumnDef::new(Tasks::NodeId).string().not_null())
                    .col(ColumnDef::new(Tasks::NodeName).string().null())
                    .col(ColumnDef::new(Tasks::AssigneeId).uuid().null())
                    .col(ColumnDef::new(Tasks::CandidateGroups).json_binary().null())
                    .col(
                        ColumnDef::new(Tasks::Status)
                            .string()
                            .not_null()
                            .default("pending"),
                    )
                    .col(ColumnDef::new(Tasks::Outcome).string().null())
                    .col(ColumnDef::new(Tasks::FormData).json_binary().null())
                    .col(
                        ColumnDef::new(Tasks::DueDate)
                            .timestamp_with_time_zone()
                            .null(),
                    )
                    .col(
                        ColumnDef::new(Tasks::CompletedAt)
                            .timestamp_with_time_zone()
                            .null(),
                    )
                    .col(
                        ColumnDef::new(Tasks::CreatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(
                        ColumnDef::new(Tasks::UpdatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(ColumnDef::new(Tasks::CreatedBy).uuid().not_null())
                    .col(ColumnDef::new(Tasks::UpdatedBy).uuid().not_null())
                    .col(
                        ColumnDef::new(Tasks::DeletedAt)
                            .timestamp_with_time_zone()
                            .null(),
                    )
                    .col(
                        ColumnDef::new(Tasks::Version)
                            .integer()
                            .not_null()
                            .default(1),
                    )
                    .to_owned(),
            )
            .await?;

        manager
            .create_index(
                Index::create()
                    .name("idx_tasks_assignee")
                    .table(Tasks::Table)
                    .col(Tasks::TenantId)
                    .col(Tasks::AssigneeId)
                    .col(Tasks::Status)
                    .to_owned(),
            )
            .await?;

        manager
            .create_index(
                Index::create()
                    .name("idx_tasks_instance")
                    .table(Tasks::Table)
                    .col(Tasks::InstanceId)
                    .to_owned(),
            )
            .await?;

        manager
            .create_foreign_key(
                ForeignKey::create()
                    .name("fk_tasks_instance")
                    .from(Tasks::Table, Tasks::InstanceId)
                    .to(ProcessInstances::Table, ProcessInstances::Id)
                    .to_owned(),
            )
            .await?;

        manager
            .create_foreign_key(
                ForeignKey::create()
                    .name("fk_tasks_token")
                    .from(Tasks::Table, Tasks::TokenId)
                    .to(WfTokens::Table, WfTokens::Id)
                    .to_owned(),
            )
            .await?;

        Ok(())
    }

    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .drop_table(Table::drop().table(Tasks::Table).to_owned())
            .await
    }
}

#[derive(DeriveIden)]
enum Tasks {
    Table,
    Id,
    TenantId,
    InstanceId,
    TokenId,
    NodeId,
    NodeName,
    AssigneeId,
    CandidateGroups,
    Status,
    Outcome,
    FormData,
    DueDate,
    CompletedAt,
    CreatedAt,
    UpdatedAt,
    CreatedBy,
    UpdatedBy,
    DeletedAt,
    Version,
}

#[derive(DeriveIden)]
enum ProcessInstances {
    Table,
    Id,
}

#[derive(DeriveIden)]
enum WfTokens {
    Table,
    Id,
}