import buildForeignKeyConstraint, { resolveForeignKeyName, } from "./build-foreign-key-constraint";
import MariaDBQuoteGen from "./mariadb-quote-gen";
import runSchemaQuery, { querySchemaRows } from "./run-schema-query";
function normalizeRule(rule) {
    return String(rule || "RESTRICT").toUpperCase().replace(/_/g, " ");
}
function ruleIsCascade(rule) {
    return normalizeRule(rule) === "CASCADE";
}
function fkIdentityKey(fk) {
    return `${fk.column}\0${fk.refTable}\0${fk.refColumn}`;
}
function rulesMatch(live, desired) {
    return (ruleIsCascade(live.deleteRule) === desired.cascadeDelete &&
        ruleIsCascade(live.updateRule) === desired.cascadeUpdate);
}
export function grabDesiredForeignKeys(table) {
    if (table.isVector) {
        return [];
    }
    const desired = [];
    for (const field of table.fields || []) {
        const fk = field.foreignKey;
        if (!field.fieldName ||
            !fk?.destinationTableName ||
            !fk.destinationTableColumnName) {
            continue;
        }
        desired.push({
            name: resolveForeignKeyName(field, table.tableName),
            column: field.fieldName,
            refTable: fk.destinationTableName,
            refColumn: fk.destinationTableColumnName,
            cascadeDelete: Boolean(fk.cascadeDelete),
            cascadeUpdate: Boolean(fk.cascadeUpdate),
            field,
        });
    }
    return desired;
}
export async function grabLiveForeignKeys({ tableName, config, }) {
    const databaseName = config?.db_name || global.CONFIG?.db_name;
    const schemaWhere = databaseName
        ? "rc.CONSTRAINT_SCHEMA = ?"
        : "rc.CONSTRAINT_SCHEMA = DATABASE()";
    const schemaValues = databaseName ? [databaseName] : [];
    const rows = await querySchemaRows({
        query: `
            SELECT
                rc.CONSTRAINT_NAME,
                kcu.COLUMN_NAME,
                kcu.REFERENCED_TABLE_NAME,
                kcu.REFERENCED_COLUMN_NAME,
                rc.DELETE_RULE,
                rc.UPDATE_RULE
            FROM information_schema.REFERENTIAL_CONSTRAINTS rc
            INNER JOIN information_schema.KEY_COLUMN_USAGE kcu
                ON rc.CONSTRAINT_SCHEMA = kcu.CONSTRAINT_SCHEMA
                AND rc.CONSTRAINT_NAME = kcu.CONSTRAINT_NAME
                AND rc.TABLE_NAME = kcu.TABLE_NAME
            WHERE ${schemaWhere}
                AND rc.TABLE_NAME = ?
                AND kcu.REFERENCED_TABLE_NAME IS NOT NULL
            ORDER BY rc.CONSTRAINT_NAME, kcu.ORDINAL_POSITION
        `,
        values: [...schemaValues, tableName],
        config,
    });
    // Single-column FKs only (schema model is one FK per field)
    const byName = new Map();
    for (const row of rows) {
        if (byName.has(row.CONSTRAINT_NAME)) {
            continue;
        }
        byName.set(row.CONSTRAINT_NAME, {
            name: row.CONSTRAINT_NAME,
            column: row.COLUMN_NAME,
            refTable: row.REFERENCED_TABLE_NAME,
            refColumn: row.REFERENCED_COLUMN_NAME,
            deleteRule: row.DELETE_RULE,
            updateRule: row.UPDATE_RULE,
        });
    }
    return [...byName.values()];
}
export async function dropForeignKey({ tableName, constraintName, config, }) {
    console.log(`Dropping foreign key: ${constraintName} on ${tableName}`);
    await runSchemaQuery({
        query: `ALTER TABLE ${MariaDBQuoteGen(tableName)} DROP FOREIGN KEY ${MariaDBQuoteGen(constraintName)}`,
        config,
    });
}
export async function dropForeignKeysOnColumns({ tableName, columns, config, }) {
    if (columns.length === 0)
        return;
    const live = await grabLiveForeignKeys({ tableName, config });
    const colSet = new Set(columns);
    for (const fk of live) {
        if (colSet.has(fk.column)) {
            await dropForeignKey({
                tableName,
                constraintName: fk.name,
                config,
            });
        }
    }
}
/**
 * Drop foreign keys that are removed from schema or need recreation
 * (name/cascade/target changed). Run before index cleanup.
 */
export async function dropObsoleteForeignKeys({ table, config, }) {
    const desired = grabDesiredForeignKeys(table);
    const live = await grabLiveForeignKeys({
        tableName: table.tableName,
        config,
    });
    const keepNames = new Set();
    const droppedNames = new Set();
    const dropOnce = async (name) => {
        if (droppedNames.has(name))
            return;
        droppedNames.add(name);
        await dropForeignKey({
            tableName: table.tableName,
            constraintName: name,
            config,
        });
    };
    for (const want of desired) {
        const byIdentity = live.find((existing) => !keepNames.has(existing.name) &&
            !droppedNames.has(existing.name) &&
            fkIdentityKey(existing) === fkIdentityKey(want));
        if (byIdentity &&
            rulesMatch(byIdentity, want) &&
            byIdentity.name === want.name) {
            keepNames.add(byIdentity.name);
            continue;
        }
        // Changed relationship → drop so ensureForeignKeys can recreate
        if (byIdentity) {
            await dropOnce(byIdentity.name);
        }
        const byName = live.find((existing) => existing.name === want.name);
        if (byName && byName !== byIdentity) {
            await dropOnce(byName.name);
        }
    }
    for (const existing of live) {
        if (keepNames.has(existing.name) || droppedNames.has(existing.name)) {
            continue;
        }
        // Not in schema anymore
        await dropOnce(existing.name);
    }
}
/**
 * Ensure all desired foreign keys exist. Run after indexes/uniques.
 */
export async function ensureForeignKeys({ table, config, }) {
    const desired = grabDesiredForeignKeys(table);
    const live = await grabLiveForeignKeys({
        tableName: table.tableName,
        config,
    });
    for (const want of desired) {
        const exists = live.some((existing) => fkIdentityKey(existing) === fkIdentityKey(want) &&
            rulesMatch(existing, want) &&
            existing.name === want.name);
        if (exists) {
            continue;
        }
        console.log(`Creating foreign key: ${want.name} (${want.column} → ${want.refTable}.${want.refColumn}) on ${table.tableName}`);
        await runSchemaQuery({
            query: `ALTER TABLE ${MariaDBQuoteGen(table.tableName)} ADD ${buildForeignKeyConstraint(want.field, table.tableName)}`,
            config,
        });
    }
}
export default async function syncForeignKeys({ table, config, }) {
    await dropObsoleteForeignKeys({ table, config });
    await ensureForeignKeys({ table, config });
}