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use std::collections::HashMap;

use crate::{salmo_contex::SalmoContext, backend::MigrationStatus};

pub struct TryStatus {
  pub up_to_date: bool,
  pub id: String
}

pub struct StatusSummary {
  pub already_migrated: Vec<String>,
  pub pending_migration: Vec<String>,
  pub tries: Vec<TryStatus>,
  pub untried: Vec<String>
}


pub struct CommittedStatus {
  pub already_migrated: Vec<String>,
  pub pending_migration: Vec<String>
}

pub fn get_status(context: SalmoContext) -> anyhow::Result<HashMap<String, StatusSummary>> {
  let commits = context.commits()?;
  let migrations_registry = context.migrations()?;
  let all_migrations = migrations_registry.db.into_values().collect::<Vec<_>>();
  context.environments.iter().map(|e| {
    let mut backend = e.backend()?;
    let s = backend.migration_status(&commits, all_migrations.as_slice())?;

    let already_migrated = s.iter().filter_map(|m| match m.status {
      MigrationStatus::Executed => Some(m.migration.id.clone()),
        _ => None
    }).collect();

    let pending_migration = s.iter().filter_map(|m| match m.status {
      MigrationStatus::Committed { tried: _ } => Some(m.migration.id.clone()),
        _ => None
    }).collect();

    let untried = s.iter().filter_map(|m| match m.status {
      MigrationStatus::Untried => Some(m.migration.id.clone()),
        _ => None
    }).collect();

    let tries = s.iter().filter_map(|m| match m.status {
      MigrationStatus::Tried { up_to_date } => Some(TryStatus { up_to_date, id: m.migration.id.clone() }),
        _ => None
    }).collect();


    Ok((e.name.clone(), StatusSummary {
      already_migrated,
      pending_migration,
      tries,
      untried
    }))
  }).collect()
}