@complete external
extern "sudo" [...args: string]

@complete external
extern "doas" [...args: string]

let inshellah_static_complete = { |spans|
    try {
        let completed = (^inshellah complete ...$spans | complete)
        if $completed.exit_code != 0 {
            null
        } else {
            let parsed = (try { $completed.stdout | from json } catch { null })
            let parsed_type = ($parsed | describe)
            if $parsed == null {
                null
            } else if (($parsed_type | str starts-with "list") or ($parsed_type | str starts-with "table")) {
                $parsed
            } else {
                null
            }
        }
    } catch {
        null
    }
}

let inshellah_nonempty = { |items|
    let result = ($items | default [] | compact)
    if ($result | is-empty) { null } else { $result }
}

let inshellah_unit_candidates = { |scope, prefix|
    try {
        ^systemctl ...$scope list-units --all --no-pager --plain --full --no-legend $"($prefix)*"
            | lines
            | each { |l|
                let parsed = $l | parse -r '(?P<unit>\S+)\s+\S+\s+\S+\s+\S+\s+(?P<desc>.*)'
                if ($parsed | length) > 0 {
                    {value: $parsed.0.unit, description: ($parsed.0.desc | str trim)}
                }
            } | compact
    } catch { null }
}

let inshellah_kubectl_scope = { |spans|
    let all_namespaces = ("-A" in $spans) or ("--all-namespaces" in $spans)
    let namespace_eq = ($spans | where { |s| $s =~ '^--namespace=' } | get 0? | default "")
    let namespace_arg = (
        $spans
        | enumerate
        | where { |it| $it.item == "-n" or $it.item == "--namespace" }
        | reverse
        | get 0?
        | default null
    )
    let namespace = if not ($namespace_eq | is-empty) {
        $namespace_eq | str replace --regex '^--namespace=' ''
    } else if $namespace_arg != null and (($namespace_arg.index + 1) < ($spans | length)) {
        $spans | get ($namespace_arg.index + 1)
    } else {
        ""
    }

    if $all_namespaces {
        {args: [--all-namespaces], all: true}
    } else if not ($namespace | is-empty) {
        {args: [-n $namespace], all: false}
    } else {
        {args: [], all: false}
    }
}

let inshellah_kubectl_names = { |kind, spans|
    if ($kind | is-empty) or ($kind | str starts-with "-") {
        null
    } else {
        let scope = do $inshellah_kubectl_scope $spans
        let columns = if $scope.all {
            "custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name"
        } else {
            "custom-columns=NAME:.metadata.name"
        }
        try {
            let rows = (
                ^kubectl get $kind ...$scope.args --no-headers -o $columns
                    | lines
                    | str trim
                    | where { |n| not ($n | is-empty) }
            )
            if $scope.all {
                $rows | each { |row|
                    let parts = $row | split row -r '\s+'
                    if ($parts | length) >= 2 {
                        {value: ($parts | get 1), description: $"($kind) in ($parts | get 0)"}
                    }
                } | compact
            } else {
                $rows | each { |n| {value: $n, description: $kind} }
            }
        } catch { null }
    }
}

let inshellah_git_refs = { ||
    try {
        ^git for-each-ref --format='%(refname:short)%09%(objecttype)%09%(contents:subject)' refs/heads refs/remotes refs/tags
            | lines
            | each { |l|
                let p = $l | split row "\t"
                if ($p | length) >= 3 { {value: $p.0, description: $p.2} }
            } | compact
    } catch { null }
}

let inshellah_git_branches = { ||
    try {
        ^git for-each-ref --format='%(refname:short)%09%(contents:subject)' refs/heads
            | lines
            | each { |l|
                let p = $l | split row "\t"
                if ($p | length) >= 2 { {value: $p.0, description: $p.1} }
            } | compact
    } catch { null }
}

let inshellah_git_remotes = { ||
    try {
        ^git remote
            | lines
            | str trim
            | where { |r| not ($r | is-empty) }
            | each { |r| {value: $r, description: "remote"} }
    } catch { null }
}

let inshellah_git_worktrees = { ||
    try {
        ^git worktree list --porcelain
            | lines
            | each { |l|
                let m = $l | parse -r '^worktree\s+(?P<p>.+)$'
                if ($m | length) > 0 { {value: $m.0.p, description: ""} }
            } | compact
    } catch { null }
}

let inshellah_complete = { |spans|
    let completions = do $inshellah_static_complete $spans
    let span_len = ($spans | length)
    let last_span = if $span_len > 0 { $spans | last } else { "" }
    let prev_span = if $span_len >= 2 { $spans | get ($span_len - 2) } else { "" }
    let sub = if $span_len >= 2 { $spans | get 1 } else { "" }

    let additional = if ($completions == null and $span_len > 0) {
        match $spans.0 {
            "nix" => {
                if $span_len < 2 {
                    null
                } else {
                    try {
                        let nix_output = (
                            with-env { NIX_GET_COMPLETIONS: ($span_len - 1) } {
                                $spans | run-external $in
                            }
                            | split row -r '\n'
                            | str trim
                            | skip 1
                            | where { |e| not ($e | is-empty) }
                        )
                        if (($nix_output | length) < 6 and
                            $last_span =~ "[a-zA-Z][a-zA-Z0-9_-]*#[a-zA-Z][a-zA-Z0-9_-]*") {
                            with-env { NIX_ALLOW_UNFREE: "1" NIX_ALLOW_BROKEN: "1" } {
                                $nix_output | par-each { |e|
                                    try {
                                        {value: $e, description: (^nix eval --raw --impure $e --apply "f: f.meta.description" err> /dev/null)}
                                    } catch {
                                        {value: $e, description: ""}
                                    }
                                }
                            }
                        } else {
                            $nix_output | each { |e| {value: $e, description: ""} }
                        }
                    } catch { null }
                }
            }
            "systemctl" => {
                let unit_verbs = [
                    "status" "show" "cat" "help" "start" "stop" "restart" "reload" "try-restart"
                    "reload-or-restart" "reload-or-try-restart" "isolate" "kill" "reset-failed"
                    "enable" "disable" "reenable" "preset" "mask" "unmask" "is-active" "is-failed"
                    "is-enabled" "edit"
                ]
                let args = $spans | skip 1 | where { |s| not ($s | str starts-with "-") }
                let verb = $args | get 0? | default ""
                if (($verb in $unit_verbs) and $span_len >= 3) {
                    let scope = if ("--user" in $spans) { [--user] } else { [] }
                    do $inshellah_unit_candidates $scope $last_span
                } else { null }
            }
            "journalctl" => {
                if ($prev_span == "--unit" or $prev_span == "-u") {
                    let scope = if ("--user-unit" in $spans or "--user" in $spans) { [--user] } else { [] }
                    do $inshellah_unit_candidates $scope $last_span
                } else { null }
            }
            "coredumpctl" => {
                let unit_verbs = ["dump" "info" "debug" "list"]
                if (($sub in $unit_verbs) and $span_len >= 3) {
                    let units = (do $inshellah_unit_candidates [] $last_span | default [])
                    let pids = (try {
                        ^coredumpctl list --no-pager --no-legend
                            | lines
                            | each { |l|
                                let p = $l | split row -r '\s+'
                                if ($p | length) >= 5 { {value: $p.4, description: $"PID ($p.4) ($p | get 9? | default "")"} }
                            } | compact
                    } catch { [] })
                    $units | append $pids
                } else { null }
            }
            "loginctl" => {
                let user_verbs = ["user-status" "show-user" "enable-linger" "disable-linger" "kill-user" "terminate-user"]
                let session_verbs = ["session-status" "show-session" "activate" "lock-session" "unlock-session" "terminate-session" "kill-session"]
                if (($sub in $user_verbs) and $span_len >= 3) {
                    try {
                        ^loginctl list-users --no-pager --no-legend
                            | lines | each { |l|
                                let p = $l | str trim | split row -r '\s+'
                                if ($p | length) >= 2 { {value: $p.1, description: $"UID ($p.0)"} }
                            } | compact
                    } catch { null }
                } else if (($sub in $session_verbs) and $span_len >= 3) {
                    try {
                        ^loginctl list-sessions --no-pager --no-legend
                            | lines | each { |l|
                                let p = $l | str trim | split row -r '\s+'
                                if ($p | length) >= 3 { {value: $p.0, description: $"user ($p.2)"} }
                            } | compact
                    } catch { null }
                } else { null }
            }
            "machinectl" => {
                let machine_verbs = ["status" "show" "start" "login" "shell" "enable" "disable" "poweroff" "reboot" "terminate" "kill" "bind" "copy-to" "copy-from"]
                if (($sub in $machine_verbs) and $span_len >= 3) {
                    try {
                        ^machinectl list --no-pager --no-legend
                            | lines | each { |l|
                                let p = $l | str trim | split row -r '\s+'
                                if ($p | length) >= 1 { {value: $p.0, description: ($p | get 1? | default "")} }
                            } | compact
                    } catch { null }
                } else { null }
            }
            "networkctl" => {
                let link_verbs = ["status" "show" "up" "down" "renew" "forcerenew" "reconfigure" "delete"]
                if (($sub in $link_verbs) and $span_len >= 3) {
                    try {
                        ^networkctl list --no-pager --no-legend
                            | lines | each { |l|
                                let p = $l | str trim | split row -r '\s+'
                                if ($p | length) >= 4 { {value: $p.1, description: $"($p.2) ($p.3)"} }
                            } | compact
                    } catch { null }
                } else { null }
            }
            "hostnamectl" | "timedatectl" | "localectl" => {
                null
            }
            "ssh" | "scp" | "sftp" => {
                let cfg_hosts = (try {
                    open ~/.ssh/config | lines | each { |l|
                        let m = $l | parse -r '(?i)^\s*Host\s+(?P<h>.+)$'
                        if ($m | length) > 0 { $m.0.h | split row -r '\s+' } else { [] }
                    } | flatten | where { |h| not ($h | str contains '*') and not ($h | is-empty) }
                } catch { [] })
                let known = (try {
                    open ~/.ssh/known_hosts | lines | each { |l|
                        ($l | split row -r '\s+' | get 0? | default "") | split row ','
                    } | flatten | where { |h| (not ($h | is-empty)) and (not ($h | str starts-with '|')) and (not ($h | str starts-with '[')) }
                } catch { [] })
                $cfg_hosts | append $known | uniq | each { |h| {value: $h, description: ""} }
            }
            "docker" | "podman" => {
                let need_container = ["exec" "logs" "inspect" "start" "stop" "restart" "rm" "kill" "attach" "cp" "top" "wait" "pause" "unpause" "port" "commit" "diff" "export"]
                let need_image = ["run" "rmi" "tag" "push" "pull" "history" "save" "create"]
                if ($sub in $need_container) {
                    try {
                        ^($spans.0) ps -a --format '{{.Names}}\t{{.Image}}'
                            | lines | each { |l|
                                let p = $l | split row "\t"
                                if ($p | length) >= 2 { {value: $p.0, description: $p.1} }
                            } | compact
                    } catch { null }
                } else if ($sub in $need_image) {
                    try {
                        ^($spans.0) images --format '{{.Repository}}:{{.Tag}}\t{{.Size}}'
                            | lines | each { |l|
                                let p = $l | split row "\t"
                                if (($p | length) >= 2) and (not ($p.0 | str ends-with ':<none>')) {
                                    {value: $p.0, description: $p.1}
                                }
                            } | compact
                    } catch { null }
                } else { null }
            }
            "kubectl" => {
                let resource_verbs = ["get" "describe" "delete" "edit" "scale" "annotate" "label"]
                if (($sub in $resource_verbs) and $span_len >= 4) {
                    let kind = $spans | get 2? | default ""
                    do $inshellah_kubectl_names $kind $spans
                } else if (($sub == "logs" or $sub == "exec" or $sub == "port-forward") and $span_len >= 3) {
                    do $inshellah_kubectl_names "pods" $spans
                } else if ($sub == "rollout" and $span_len >= 5) {
                    let action = $spans | get 2? | default ""
                    let kind = $spans | get 3? | default ""
                    if ($action in ["history" "pause" "restart" "resume" "status" "undo"]) {
                        do $inshellah_kubectl_names $kind $spans
                    } else { null }
                } else { null }
            }
            "git" => {
                let ref_verbs = ["checkout" "merge" "rebase" "log" "diff" "show" "reset" "cherry-pick" "revert" "tag" "blame" "bisect"]
                let branch_verbs = ["switch" "branch"]
                if ($sub == "worktree") {
                    let worktree_verb = $spans | get 2? | default ""
                    if ($worktree_verb in ["remove" "move" "lock" "unlock" "repair"]) {
                        do $inshellah_git_worktrees
                    } else if ($worktree_verb == "add" and $span_len >= 5) {
                        do $inshellah_git_refs
                    } else { null }
                } else if (($sub == "push" or $sub == "pull") and $span_len >= 3) {
                    if $span_len <= 3 {
                        do $inshellah_git_remotes
                    } else {
                        do $inshellah_git_refs
                    }
                } else if (($sub in $branch_verbs) and $span_len >= 3) {
                    do $inshellah_git_branches
                } else if (($sub in $ref_verbs) and $span_len >= 3) {
                    do $inshellah_git_refs
                } else { null }
            }
            "npm" | "pnpm" | "yarn" => {
                let wants = (
                    (($spans.0 == "yarn") and $span_len == 2)
                    or (($sub == "run" or $sub == "run-script") and $span_len == 3)
                )
                if $wants {
                    try {
                        open package.json | get scripts? | default {} | transpose name cmd
                            | each { |row| {value: $row.name, description: $row.cmd} }
                    } catch { null }
                } else { null }
            }
            "make" => {
                if $span_len <= 2 {
                    try {
                        open Makefile | lines
                            | each { |l|
                                let m = $l | parse -r '^(?P<t>[A-Za-z0-9_./-]+)\s*:'
                                if (($m | length) > 0) and (not ($m.0.t | str starts-with '.')) {
                                    {value: $m.0.t, description: ""}
                                }
                            } | compact | uniq-by value
                    } catch { null }
                } else { null }
            }
            "just" => {
                if $span_len <= 2 {
                    try {
                        ^just --list --unsorted
                            | lines | skip 1
                            | each { |l|
                                let m = $l | parse -r '^\s+(?P<t>[A-Za-z0-9_-]+)(?:\s+\S.*)?(?:\s*#\s*(?P<d>.*))?$'
                                if ($m | length) > 0 {
                                    {value: $m.0.t, description: ($m.0.d? | default "")}
                                }
                            } | compact
                    } catch { null }
                } else { null }
            }
            "cargo" => {
                let target_flags = ["--bin" "--example" "--test" "--bench"]
                if ($prev_span == "-p" or $prev_span == "--package") {
                    try {
                        ^cargo metadata --no-deps --format-version 1
                            | from json
                            | get packages
                            | each { |pkg| {value: $pkg.name, description: ($pkg.version? | default "")} }
                            | uniq-by value
                    } catch { null }
                } else if ($prev_span in $target_flags) {
                    let kind = $prev_span | str replace "--" ""
                    try {
                        ^cargo metadata --no-deps --format-version 1
                            | from json
                            | get packages
                            | each { |pkg|
                                $pkg.targets
                                    | where { |t| $kind in $t.kind }
                                    | each { |t| {value: $t.name, description: ($t.kind | str join ",")} }
                            }
                            | flatten
                            | uniq-by value
                    } catch { null }
                } else { null }
            }
            "kill" | "pkill" => {
                try {
                    ^ps -eo pid,comm --no-headers
                        | lines
                        | each { |l|
                            let parts = $l | str trim | split row -r '\s+'
                            if ($parts | length) >= 2 {
                                let pid = $parts | get 0
                                let comm = $parts | skip 1 | str join " "
                                if ($spans.0 == "kill") { {value: $pid, description: $comm} }
                                else { {value: $comm, description: $pid} }
                            }
                        } | compact
                } catch { null }
            }
            _ => { null }
        }
    } else { null }

    let result = ($completions | default []) | append ($additional | default []) | compact
    if ($result | is-empty) { null } else { $result }
}

$env.config.completions.external = {enable: true, max_results: 200, completer: $inshellah_complete}