<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Migration_Finalize_budget_dimensions extends CI_Migration
{
    private function column($table, $column, $definition)
    {
        if ($this->tableExists($table) && !$this->fieldExists($table, $column)) {
            $this->db->query("ALTER TABLE `{$table}` ADD `{$column}` {$definition}");
        }
    }

    private function hasIndex($table, $name)
    {
        if (!$this->tableExists($table)) return false;
        foreach ($this->db->query("SHOW INDEX FROM `{$table}`")->result() as $index) {
            if ($index->Key_name === $name) return true;
        }
        return false;
    }

    private function tableExists($table)
    {
        return (bool) $this->db->query(
            'SELECT 1 FROM information_schema.tables WHERE table_schema=DATABASE() AND table_name=? LIMIT 1',
            array($table)
        )->row();
    }

    private function fieldExists($table, $column)
    {
        return (bool) $this->db->query(
            'SELECT 1 FROM information_schema.columns WHERE table_schema=DATABASE() AND table_name=? AND column_name=? LIMIT 1',
            array($table, $column)
        )->row();
    }

    public function up()
    {
        foreach (array(
            'company_id' => 'BIGINT UNSIGNED NULL AFTER `id`',
            'description' => 'TEXT NULL AFTER `control_mode`',
            'revision_no' => 'INT NOT NULL DEFAULT 1 AFTER `version_no`',
            'parent_budget_id' => 'BIGINT UNSIGNED NULL AFTER `revision_no`',
            'submitted_by' => 'INT NULL AFTER `created_by`',
            'submitted_at' => 'DATETIME NULL AFTER `submitted_by`',
            'rejected_by' => 'INT NULL AFTER `approved_at`',
            'rejected_at' => 'DATETIME NULL AFTER `rejected_by`',
            'rejection_reason' => 'TEXT NULL AFTER `rejected_at`',
            'updated_by' => 'INT NULL AFTER `created_at`',
            'updated_at' => 'DATETIME NULL AFTER `updated_by`'
        ) as $column => $definition) $this->column('budgets', $column, $definition);

        foreach (array(
            'company_id' => 'BIGINT UNSIGNED NULL AFTER `id`',
            'salesperson_id' => 'BIGINT UNSIGNED NULL AFTER `profit_center_id`',
            'updated_by' => 'INT NULL AFTER `notes`',
            'created_at' => 'DATETIME NULL AFTER `updated_by`',
            'updated_at' => 'DATETIME NULL AFTER `created_at`'
        ) as $column => $definition) $this->column('budget_lines', $column, $definition);

        foreach (array(
            'company_id' => 'BIGINT UNSIGNED NULL AFTER `id`',
            'description' => 'VARCHAR(255) NULL AFTER `name`',
            'source_type' => 'VARCHAR(40) NULL AFTER `parent_id`',
            'source_id' => 'BIGINT UNSIGNED NULL AFTER `source_type`',
            'created_by' => 'INT NULL AFTER `is_active`',
            'updated_by' => 'INT NULL AFTER `created_by`',
            'updated_at' => 'DATETIME NULL AFTER `created_at`'
        ) as $column => $definition) $this->column('business_dimensions', $column, $definition);

        foreach (array('require_branch','require_department','require_project','require_cost_center','require_profit_center') as $column) {
            $this->column('accounts', $column, 'TINYINT(1) NOT NULL DEFAULT 0 AFTER `is_hidden`');
        }

        foreach (array('branch_id','department_id','profit_center_id','salesperson_id') as $column) {
            $this->column('purchase_order_lines', $column, 'BIGINT UNSIGNED NULL AFTER `budget_account_id`');
        }

        if (!$this->tableExists('budget_commitments')) {
            $this->db->query("CREATE TABLE `budget_commitments` (
                `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                `company_id` BIGINT UNSIGNED NOT NULL,
                `source_type` VARCHAR(50) NOT NULL,
                `source_id` BIGINT UNSIGNED NOT NULL,
                `source_line_id` BIGINT UNSIGNED NULL,
                `account_id` INT NOT NULL,
                `period` CHAR(7) NOT NULL,
                `branch_id` BIGINT UNSIGNED NULL,
                `department_id` BIGINT UNSIGNED NULL,
                `project_id` BIGINT UNSIGNED NULL,
                `cost_center_id` BIGINT UNSIGNED NULL,
                `profit_center_id` BIGINT UNSIGNED NULL,
                `salesperson_id` BIGINT UNSIGNED NULL,
                `original_amount` DECIMAL(18,2) NOT NULL DEFAULT 0,
                `realized_amount` DECIMAL(18,2) NOT NULL DEFAULT 0,
                `released_amount` DECIMAL(18,2) NOT NULL DEFAULT 0,
                `status` ENUM('active','partially_realized','realized','released') NOT NULL DEFAULT 'active',
                `created_at` DATETIME NOT NULL,
                `updated_at` DATETIME NULL,
                PRIMARY KEY (`id`),
                UNIQUE KEY `uq_budget_commitment_source` (`company_id`,`source_type`,`source_line_id`),
                KEY `idx_budget_commitment_report` (`company_id`,`period`,`account_id`,`status`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
        }

        if (!$this->tableExists('budget_audit_logs')) {
            $this->db->query("CREATE TABLE `budget_audit_logs` (
                `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                `company_id` BIGINT UNSIGNED NOT NULL,
                `budget_id` BIGINT UNSIGNED NULL,
                `entity_type` VARCHAR(40) NOT NULL,
                `entity_id` BIGINT UNSIGNED NULL,
                `action` VARCHAR(50) NOT NULL,
                `old_values` LONGTEXT NULL,
                `new_values` LONGTEXT NULL,
                `reason` TEXT NULL,
                `created_by` INT NULL,
                `created_at` DATETIME NOT NULL,
                PRIMARY KEY (`id`),
                KEY `idx_budget_audit_entity` (`company_id`,`entity_type`,`entity_id`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
        }

        if (!$this->hasIndex('budgets', 'idx_budget_company_year_status'))
            $this->db->query('ALTER TABLE `budgets` ADD KEY `idx_budget_company_year_status` (`company_id`,`fiscal_year`,`status`)');
        if (!$this->hasIndex('budget_lines', 'idx_budget_line_report'))
            $this->db->query('ALTER TABLE `budget_lines` ADD KEY `idx_budget_line_report` (`company_id`,`period`,`account_id`)');
        if (!$this->hasIndex('business_dimensions', 'idx_dimension_lookup'))
            $this->db->query('ALTER TABLE `business_dimensions` ADD KEY `idx_dimension_lookup` (`company_id`,`dimension_type`,`is_active`,`name`)');

        $this->db->query('UPDATE `budgets` SET `revision_no`=`version_no` WHERE `revision_no`=1 AND `version_no`>1');
        if ($this->tableExists('k_departments')) {
            $this->db->query("UPDATE business_dimensions bd JOIN k_departments d ON bd.dimension_type='department' AND bd.code=CONCAT('DEP-',d.id) SET bd.source_type='k_departments',bd.source_id=d.id,bd.name=d.department_name,bd.description=d.description WHERE bd.source_id IS NULL");
        }
    }

    public function down()
    {
        throw new RuntimeException('Gunakan backup database untuk rollback finalisasi Budget & Dimensi.');
    }
}