import fs from "fs";
import path from "path";
import { AppData } from "../data/app-data";
import grabDirNames from "../data/grab-dir-names";
import { isSchemaFileName } from "./resolve-and-load-data-file";
export const ExportArchiveMembers = {
    DbFileName: "database.sqlite",
    SchemaFileName: AppData.DbSchemaFileName,
};
const ARCHIVE_EXTENSIONS = [".tar.gz", ".tgz", ".tar", ".zip"];
/** Every SQLite database file starts with this header */
const SQLITE_HEADER = "SQLite format 3\0";
export function isArchivePath(filePath) {
    const lower = filePath.toLowerCase();
    return ARCHIVE_EXTENSIONS.some((ext) => lower.endsWith(ext));
}
export function isSqlPath(filePath) {
    return filePath.toLowerCase().endsWith(".sql");
}
export function isSQLiteFile(bytes) {
    return (new TextDecoder().decode(bytes.subarray(0, SQLITE_HEADER.length)) ===
        SQLITE_HEADER);
}
/**
 * Create a portable export archive (tar / tar.gz / zip) with the database
 * file + schema file.
 */
export async function writeExportArchive({ contents, outPath, }) {
    const lower = outPath.toLowerCase();
    if (lower.endsWith(".zip")) {
        await writeZipArchive({ contents, outPath });
        return;
    }
    const members = {
        [ExportArchiveMembers.DbFileName]: contents.db,
        [contents.schemaFileName]: contents.schema,
    };
    const gzip = lower.endsWith(".gz") || lower.endsWith(".tgz");
    if (gzip) {
        await Bun.Archive.write(outPath, members, { compress: "gzip" });
    }
    else {
        await Bun.Archive.write(outPath, members);
    }
}
/**
 * Read a portable export archive (tar / tar.gz / zip).
 */
export async function readExportArchive(archivePath) {
    if (archivePath.toLowerCase().endsWith(".zip")) {
        return readZipArchive(archivePath);
    }
    const bytes = await Bun.file(archivePath).bytes();
    const archive = new Bun.Archive(bytes);
    const files = await archive.files();
    let db = null;
    let schemaEntry = null;
    for (const [entry, file] of files) {
        const base = path.basename(entry);
        if (!db && base === ExportArchiveMembers.DbFileName) {
            db = await file.bytes();
        }
        else if (!schemaEntry && isSchemaFileName(base)) {
            schemaEntry = {
                content: await file.text(),
                fileName: schemaMemberName(base),
            };
        }
    }
    return validateContents({ db, schemaEntry });
}
function schemaMemberName(base) {
    return base === AppData.DbSchemaFileName ? "schema.ts" : base;
}
function validateContents({ db, schemaEntry, }) {
    if (!db) {
        throw new Error(`Archive is missing the database file (expected \`${ExportArchiveMembers.DbFileName}\`)`);
    }
    if (!isSQLiteFile(db)) {
        throw new Error(`\`${ExportArchiveMembers.DbFileName}\` in the archive is not a SQLite database`);
    }
    if (!schemaEntry) {
        throw new Error(`Archive is missing schema file (expected \`${AppData.DbSchemaFileName}.ts|js|json|yaml|yml\`)`);
    }
    return {
        db,
        schema: schemaEntry.content,
        schemaFileName: schemaEntry.fileName,
    };
}
async function runCommand(cmd, cwd) {
    const proc = Bun.spawn(cmd, {
        cwd,
        stdout: "pipe",
        stderr: "pipe",
    });
    const [stderr, exitCode] = await Promise.all([
        new Response(proc.stderr).text(),
        proc.exited,
    ]);
    if (exitCode !== 0) {
        throw new Error(`${cmd[0]} failed (exit ${exitCode}): ${stderr || "unknown error"}. Ensure \`${cmd[0]}\` is installed, or use .tar.gz.`);
    }
}
function makeTempDir(prefix) {
    const { BUN_SQLITE_TEMP_DIR } = grabDirNames();
    const tempDir = path.join(BUN_SQLITE_TEMP_DIR, `${prefix}-${Date.now()}-${Math.random().toString(36).slice(2)}`);
    fs.mkdirSync(tempDir, { recursive: true });
    return tempDir;
}
async function writeZipArchive({ contents, outPath, }) {
    const tempDir = makeTempDir("export");
    try {
        fs.writeFileSync(path.join(tempDir, ExportArchiveMembers.DbFileName), contents.db);
        fs.writeFileSync(path.join(tempDir, contents.schemaFileName), contents.schema, "utf-8");
        await runCommand([
            "zip",
            "-q",
            "-j",
            path.resolve(outPath),
            ExportArchiveMembers.DbFileName,
            contents.schemaFileName,
        ], tempDir);
    }
    finally {
        fs.rmSync(tempDir, { recursive: true, force: true });
    }
}
async function readZipArchive(archivePath) {
    const tempDir = makeTempDir("import");
    try {
        await runCommand([
            "unzip",
            "-q",
            "-o",
            path.resolve(archivePath),
            "-d",
            tempDir,
        ]);
        let db = null;
        let schemaEntry = null;
        const stack = [tempDir];
        while (stack.length) {
            const current = stack.pop();
            for (const entry of fs.readdirSync(current, {
                withFileTypes: true,
            })) {
                const full = path.join(current, entry.name);
                // Never follow symlinks from an extracted (untrusted) archive
                if (entry.isDirectory()) {
                    stack.push(full);
                }
                else if (!entry.isFile()) {
                    continue;
                }
                else if (!db &&
                    entry.name === ExportArchiveMembers.DbFileName) {
                    db = new Uint8Array(fs.readFileSync(full));
                }
                else if (!schemaEntry && isSchemaFileName(entry.name)) {
                    schemaEntry = {
                        content: fs.readFileSync(full, "utf-8"),
                        fileName: schemaMemberName(entry.name),
                    };
                }
            }
        }
        return validateContents({ db, schemaEntry });
    }
    finally {
        fs.rmSync(tempDir, { recursive: true, force: true });
    }
}