-- Einheitliche Tabelle für alle Bank-Importquellen (CSV-Formate + Direktverbindungen).
-- bank_import_formats und bank_connections bleiben vorerst bestehen, werden aber
-- nicht mehr vom Code gelesen. Drop in späterer Migration.

CREATE TABLE IF NOT EXISTS bank_sources (
    id              INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    type            ENUM('csv','api','fints') NOT NULL,
    provider_id     INT UNSIGNED NULL,
    bezeichnung     VARCHAR(150) NOT NULL,
    kuerzel         VARCHAR(10)  NULL,
    farbe           VARCHAR(7)   NULL DEFAULT '#6366f1',

    -- CSV-Konfiguration (NULL bei api/fints)
    skip_rows               INT NULL,
    has_header_row          TINYINT NULL,
    `delimiter`             CHAR(1) NULL,
    enclosure               CHAR(1) NULL,
    col_buchungstag         INT NULL,
    col_wertstellung        INT NULL,
    col_vorgang             INT NULL,
    col_buchungstext        INT NULL,
    col_wert                INT NULL,
    col_zahlungspflichtiger INT NULL,
    col_zahlungsempfaenger  INT NULL,
    col_verwendungszweck    INT NULL,
    date_format             VARCHAR(20) NULL,
    decimal_separator       CHAR(1) NULL,
    thousands_separator     CHAR(1) NULL,
    buchungstext_template_debit  VARCHAR(500) NULL,
    buchungstext_template_credit VARCHAR(500) NULL,

    -- API/FinTS gemeinsam
    sandbox          TINYINT(1) NOT NULL DEFAULT 0,
    last_fetched_at  TIMESTAMP NULL DEFAULT NULL,

    -- API-spezifisch (PayPal-NVP)
    app_name         VARCHAR(150) NULL,
    client_id_enc    TEXT NULL,
    secret_enc       TEXT NULL,

    -- FinTS-spezifisch
    blz              VARCHAR(11)  NULL,
    fints_url        VARCHAR(255) NULL,
    benutzerkennung  VARCHAR(100) NULL,
    pin_enc          TEXT NULL,
    iban_filter      VARCHAR(34)  NULL,

    -- Backfill-Tracking (wird am Ende dieser Migration entfernt)
    legacy_format_id     INT UNSIGNED NULL,
    legacy_connection_id INT UNSIGNED NULL,

    created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_bs_type (type),
    INDEX idx_bs_legacy_format (legacy_format_id),
    INDEX idx_bs_legacy_connection (legacy_connection_id),
    FOREIGN KEY (provider_id) REFERENCES bank_providers(id) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Backfill: CSV-Formate übernehmen
INSERT INTO bank_sources (
    type, bezeichnung, kuerzel, farbe,
    skip_rows, has_header_row, `delimiter`, enclosure,
    col_buchungstag, col_wertstellung, col_vorgang, col_buchungstext, col_wert,
    col_zahlungspflichtiger, col_zahlungsempfaenger, col_verwendungszweck,
    date_format, decimal_separator, thousands_separator,
    buchungstext_template_debit, buchungstext_template_credit,
    legacy_format_id
)
SELECT 'csv', name, kuerzel, farbe,
       skip_rows, has_header_row, `delimiter`, enclosure,
       col_buchungstag, col_wertstellung, col_vorgang, col_buchungstext, col_wert,
       col_zahlungspflichtiger, col_zahlungsempfaenger, col_verwendungszweck,
       date_format, decimal_separator, thousands_separator,
       buchungstext_template_debit, buchungstext_template_credit,
       id
FROM bank_import_formats;

-- Backfill: Direktverbindungen übernehmen (Klartext-Credentials in *_enc-Spalten;
-- werden im Anschluss durch scripts/encrypt_bank_secrets.php verschlüsselt).
INSERT INTO bank_sources (
    type, provider_id, bezeichnung, kuerzel, farbe, sandbox, last_fetched_at,
    app_name, client_id_enc, secret_enc,
    legacy_connection_id
)
SELECT
    CASE bp.verbindungstyp WHEN 'API' THEN 'api' ELSE 'fints' END,
    bc.provider_id, bc.bezeichnung, bc.kuerzel, bc.farbe, bc.sandbox, bc.last_fetched_at,
    bc.app_name, bc.client_id, bc.secret,
    bc.id
FROM bank_connections bc
JOIN bank_providers bp ON bp.id = bc.provider_id;

-- source_id-Spalte auf bank_import_batches
ALTER TABLE bank_import_batches
    ADD COLUMN IF NOT EXISTS source_id INT UNSIGNED NULL,
    ADD INDEX IF NOT EXISTS idx_bib_source (source_id);

-- Backfill: source_id aus format_id (CSV-Batches)
UPDATE bank_import_batches bib
JOIN bank_sources bs ON bs.legacy_format_id = bib.format_id AND bs.type = 'csv'
SET bib.source_id = bs.id
WHERE bib.format_id IS NOT NULL AND bib.source_id IS NULL;

-- Backfill: source_id aus connection_id (API/FinTS-Batches)
UPDATE bank_import_batches bib
JOIN bank_sources bs ON bs.legacy_connection_id = bib.connection_id AND bs.type IN ('api','fints')
SET bib.source_id = bs.id
WHERE bib.connection_id IS NOT NULL AND bib.source_id IS NULL;

-- Backfill-Tracking-Spalten wieder entfernen
ALTER TABLE bank_sources
    DROP INDEX idx_bs_legacy_format,
    DROP INDEX idx_bs_legacy_connection,
    DROP COLUMN legacy_format_id,
    DROP COLUMN legacy_connection_id;