/******************************************************************************
               __               ____                __
              / /   ___  ____ _/ __/_____________ _/ /__
             / /   / _ \/ __ `/ /_/ ___/ ___/ __ `/ / _ \
            / /___/  __/ /_/ / __(__  ) /__/ /_/ / /  __/
           /_____/\___/\__,_/_/ /____/\___/\__,_/_/\___/

   (C)opyright 2025, Leafscale, LLC -  https://www.leafscale.com

   Project: Zygaena
  Filename: upgrade.reef
   Authors: Chris Tusa <chris.tusa@leafscale.com>
   License: <see LICENSE file included with this source code>
Description: Upgrade command - upgrade installed packages

******************************************************************************/

module commands.upgrade

import sys.args
import sys.process
import io.file
import io.dir
import io.path
import core.str
import core.config
import core.database
import core.port
import core.portindex
import core.package
import types
import util.color
import util.version as ver
import exitcodes as ec

export
    fn execute(opts: types.GlobalOptions): int
end export

fn execute(opts: types.GlobalOptions): int
    let argc = args.count()

    // Load configuration and apply command-line overrides
    let base_cfg = config.load()
    let cfg = config.apply_overrides(base_cfg, opts.root, opts.prefix, opts.no_chroot)
    let root_path = config.get_root(cfg)

    // Auto-refresh port index if configured
    if config.get_auto_refresh(cfg)
        portindex.rebuild_port_index()
    end if

    // Show root if set (verbose mode)
    if opts.verbose and str.length(root_path) > 0
        color.print_info("Using root: " + root_path)
    end if

    // Count non-flag arguments (package names)
    // Skip flag values (--root, --prefix take a value)
    mut pkg_count = 0
    mut i = opts.cmd_index + 1
    while i < argc
        let arg = args.get(i)
        if arg == "--root" or arg == "--prefix"
            i = i + 2  // Skip flag and its value
            continue
        elif arg == "--no-chroot-scripts"
            i = i + 1  // valueless flag: skip only itself
            continue
        end if
        if not str.starts_with(arg, "-")
            pkg_count = pkg_count + 1
        end if
        i = i + 1
    end while

    if pkg_count == 0
        // No packages specified - upgrade all
        return upgrade_all(cfg)
    else
        // Upgrade specified packages
        mut all_success = true
        i = opts.cmd_index + 1
        while i < argc
            let pkg_name = args.get(i)

            // Skip flags and their values
            if pkg_name == "--root" or pkg_name == "--prefix"
                i = i + 2  // Skip flag and its value
                continue
            elif pkg_name == "--no-chroot-scripts"
                i = i + 1  // valueless flag: skip only itself
                continue
            end if
            if str.starts_with(pkg_name, "-")
                i = i + 1
                continue
            end if

            // Upgrade this package
            if not upgrade_package(pkg_name, cfg)
                color.print_error("Failed to upgrade: " + pkg_name)
                all_success = false
            end if

            i = i + 1
        end while

        if all_success
            return ec.EXIT_SUCCESS()
        else
            return ec.EXIT_UPGRADE_FAILED()
        end if
    end if
end execute

fn upgrade_all(cfg: config.Config): int
    color.print_action("Checking for upgrades...")

    // Get root path for rooted operations
    let root_path = config.get_root(cfg)

    // List all installed packages (use rooted version if root is set)
    mut installed: [string] = new [string](512)
    let installed_count = list_installed_pkgs(installed, 512, root_path)

    if installed_count == 0
        color.print_info("No packages installed")
        return ec.EXIT_SUCCESS()
    end if

    // Check each package for updates
    mut upgradable: [string] = new [string](512)
    mut upgradable_count = 0

    mut i = 0
    while i < installed_count
        let pkg_name = installed[i]

        if has_upgrade(pkg_name, root_path)
            upgradable[upgradable_count] = pkg_name
            upgradable_count = upgradable_count + 1
        end if

        i = i + 1
    end while

    if upgradable_count == 0
        color.print_success("All packages are up to date")
        return ec.EXIT_SUCCESS()
    end if

    color.print_info("Packages to upgrade: " + int_to_str(upgradable_count))

    // List packages to upgrade
    i = 0
    while i < upgradable_count
        let pkg_name = upgradable[i]
        let installed_pkg = get_installed_pkg(pkg_name, root_path)
        let port_result = port.find(pkg_name)

        if port_result.success
            let p = port_result.port
            println("  " + pkg_name + " " + installed_pkg.info.version + " -> " + p.info.version)
        end if

        i = i + 1
    end while

    // Ask for confirmation unless -y flag
    if not args.has_flag("y") and not args.has_flag("yes")
        color.print_info("Use -y flag to skip confirmation and proceed with upgrade")
        return ec.EXIT_CANCELLED()
    end if

    // Dry-run: show what would be done and exit
    if args.has_flag("n") or args.has_flag("dry-run")
        color.print_info("Dry run — no changes made")
        return ec.EXIT_SUCCESS()
    end if

    // Perform upgrades
    mut all_success = true
    i = 0
    while i < upgradable_count
        if not upgrade_package(upgradable[i], cfg)
            color.print_error("Failed to upgrade: " + upgradable[i])
            all_success = false
        end if
        i = i + 1
    end while

    if all_success
        return ec.EXIT_SUCCESS()
    else
        return ec.EXIT_UPGRADE_FAILED()
    end if
end upgrade_all

fn has_upgrade(pkg_name: string, root_path: string): bool
    // Get installed version (use rooted version if root is set)
    let installed_pkg = get_installed_pkg(pkg_name, root_path)
    if str.length(installed_pkg.info.name) == 0
        return false
    end if

    // Find port
    let port_result = port.find(pkg_name)
    if not port_result.success
        return false
    end if

    let p = port_result.port

    // Compare versions using semantic versioning
    return ver.compare_versions(installed_pkg.info.version, p.info.version) < 0
end has_upgrade

// Helper functions for rooted operations
fn list_installed_pkgs(names: [string], max_count: int, root_path: string): int
    if str.length(root_path) > 0
        return database.list_installed_rooted(names, max_count, root_path)
    end if
    return database.list_installed(names, max_count)
end list_installed_pkgs

fn get_installed_pkg(name: string, root_path: string): types.InstalledPackage
    if str.length(root_path) > 0
        return database.get_installed_rooted(name, root_path)
    end if
    return database.get_installed(name)
end get_installed_pkg

fn is_installed_pkg(name: string, root_path: string): bool
    if str.length(root_path) > 0
        return database.is_installed_rooted(name, root_path)
    end if
    return database.is_installed(name)
end is_installed_pkg

fn get_files_list(name: string, files: [string], max_count: int, root_path: string): int
    if str.length(root_path) > 0
        return database.get_files_rooted(name, files, max_count, root_path)
    end if
    return database.get_files(name, files, max_count)
end get_files_list

fn unregister_pkg(name: string, root_path: string): bool
    if str.length(root_path) > 0
        return database.unregister_package_rooted(name, root_path)
    end if
    return database.unregister_package(name)
end unregister_pkg

fn register_pkg(pkg: types.InstalledPackage, root_path: string): bool
    if str.length(root_path) > 0
        return database.register_from_extract_dir_rooted(pkg, "", root_path)
    end if
    return database.register_package(pkg)
end register_pkg

fn get_actual_root(root_path: string): string
    if str.length(root_path) == 0
        return "/"
    end if
    return root_path
end get_actual_root

fn upgrade_package(pkg_name: string, cfg: config.Config): bool
    // Get root path for rooted operations
    let root_path = config.get_root(cfg)

    // Check if installed (use rooted version if root is set)
    if not is_installed_pkg(pkg_name, root_path)
        color.print_error(pkg_name + " is not installed")
        return false
    end if

    // Get installed info (use rooted version if root is set)
    let installed_pkg = get_installed_pkg(pkg_name, root_path)

    // Find port
    let port_result = port.find(pkg_name)
    if not port_result.success
        color.print_error("Port not found: " + pkg_name)
        return false
    end if

    let p = port_result.port

    // Check if upgrade is available using semantic versioning
    let cmp = ver.compare_versions(installed_pkg.info.version, p.info.version)
    if cmp >= 0
        color.print_info(pkg_name + " is already at version " + installed_pkg.info.version)
        return true
    end if

    color.print_action("Upgrading " + pkg_name + " from " + installed_pkg.info.version + " to " + p.info.version + "...")

    // Look for pre-built package
    let pkg_path = find_package(pkg_name, p.info.version, p.info.release, cfg)

    if str.length(pkg_path) == 0
        color.print_error("Package not found. Build it first with: coral build")
        return false
    end if

    // Remove old version (keep database entry for now)
    mut files: [string] = new [string](4096)
    let file_count = get_files_list(pkg_name, files, 4096, root_path)

    color.print_info("Removing old files...")
    let actual_root = get_actual_root(root_path)
    remove_files(files, file_count, actual_root)

    // Install new version
    color.print_info("Installing new version...")

    // Create extraction directory
    let extract_dir = create_extract_dir(cfg)
    if str.length(extract_dir) == 0
        color.print_error("Failed to create extraction directory")
        return false
    end if

    // Extract package
    let result = package.extract_package(pkg_path, extract_dir)
    if not result.success
        color.print_error(result.error)
        cleanup_extract_dir(extract_dir)
        return false
    end if

    // Read new file list
    mut new_files: [string] = new [string](4096)
    let new_file_count = package.read_footprint(extract_dir, new_files, 4096)

    // Install files to proper root
    if not package.install_files(extract_dir, actual_root)
        color.print_error("Failed to install files")
        cleanup_extract_dir(extract_dir)
        return false
    end if

    // Update database (remove and re-add) using rooted versions if needed
    unregister_pkg(pkg_name, root_path)

    let new_info = package.read_pkginfo(extract_dir)
    mut new_pkg = types.new_installed_package()
    new_pkg.info = new_info
    new_pkg.install_date = "2025-01-24"
    new_pkg.install_reason = "explicit"
    new_pkg.files = new_files
    new_pkg.files_count = new_file_count

    // Register using rooted version if root is set
    if str.length(root_path) > 0
        if not database.register_from_extract_dir_rooted(new_pkg, extract_dir, root_path)
            color.print_warning("Failed to update database")
        end if
    else
        if not database.register_from_extract_dir(new_pkg, extract_dir)
            color.print_warning("Failed to update database")
        end if
    end if

    // Cleanup
    cleanup_extract_dir(extract_dir)

    color.print_success("Upgraded " + pkg_name + " to " + p.info.version)
    return true
end upgrade_package

// Find a package file by name and version
fn find_package(name: string, version: string, release: int, cfg: config.Config): string
    let packages_dir = config.get_packages_dir(cfg)
    let pkg_name = name + "-" + version + "-" + int_to_str(release) + ".pkg.tar.xz"
    let pkg_path = path.join_path(packages_dir, pkg_name)

    if file.fileExists(pkg_path)
        return pkg_path
    end if

    return ""
end find_package

// Remove files from system
fn remove_files(files: [string], file_count: int, root_path: string): bool
    mut i = file_count - 1
    while i >= 0
        let rel_path = files[i]
        let full_path = path.join_path(root_path, rel_path)

        if file.fileExists(full_path)
            let cmd = "rm -f \"" + full_path + "\""
            let pid = process.process_spawn_shell(cmd)
            if pid > 0
                process.process_wait(pid)
            end if
        end if

        i = i - 1
    end while

    return true
end remove_files

// Create extraction directory
fn create_extract_dir(cfg: config.Config): string
    let work_dir = config.get_work_dir(cfg)
    let pid = process.getpid()
    let extract_dir = path.join_path(work_dir, "upgrade_" + int_to_str(pid))

    if dir.dir_exists(extract_dir)
        let cmd = "rm -rf \"" + extract_dir + "\""
        let rm_pid = process.process_spawn_shell(cmd)
        if rm_pid > 0
            process.process_wait(rm_pid)
        end if
    end if

    if not dir.create_dir_all(extract_dir)
        return ""
    end if

    return extract_dir
end create_extract_dir

// Cleanup extraction directory
fn cleanup_extract_dir(dir_path: string): bool
    if str.length(dir_path) == 0
        return true
    end if

    let cmd = "rm -rf \"" + dir_path + "\""
    let pid = process.process_spawn_shell(cmd)
    if pid < 0
        return false
    end if
    process.process_wait(pid)
    return true
end cleanup_extract_dir

// Helper: convert int to string
fn int_to_str(n: int): string
    if n == 0
        return "0"
    end if

    mut negative = false
    mut value = n
    if n < 0
        negative = true
        value = 0 - n
    end if

    mut result = ""
    while value > 0
        let digit = value % 10
        result = str.concat(str.substring("0123456789", digit, 1), result)
        value = value / 10
    end while

    if negative
        result = str.concat("-", result)
    end if

    return result
end int_to_str

end module