#!/bin/sh
# test-archive.sh — build/clear a synthetic ZDDC archive for end-to-end
# testing of master + cache + mirror.
#
# The fixture mimics the SHAPE of a real ZDDC archive (project →
# Archive → party → Received|Issued → dated transmittal folder →
# tracking-number-named files) but contains zero identifying data.
# Every file's content is a 4-line metadata block:
#
#   Tracking Number: FAC1-EL-CAL-0020
#   Revision: A
#   Status: IFI
#   Title: <synthetic lorem-ipsum phrase>
#
# rendered into the appropriate format per extension. Open any file
# and you can verify it's the right one. Tracking-number / revision /
# status / extension distributions are derived from a real archive
# CSV (~/archive-export*.csv) but the script never reads that CSV
# at runtime — distributions are baked in here as constants.
#
# Output lives at $TEST_ARCHIVE_DIR (default ~/zddc-test-data),
# OUTSIDE the repo. There is also a defensive .gitignore entry
# matching common in-repo paths in case someone redirects.
#
# PDF generation uses docker.io/pandoc/latex via podman with
# --userns=keep-id so output is owned by the host user. If podman
# isn't available, PDF generation falls back to plaintext PDF
# (a hand-rolled minimal valid PDF — opens but no formatting).

set -eu

# ---------------------------------------------------------------------
# Configuration
# ---------------------------------------------------------------------

TARGET="${TEST_ARCHIVE_DIR:-$HOME/zddc-test-data}"
SMALL=0
PROJECTS_FULL="Project-1 Project-2 Project-3"
PROJECTS_SMALL="Project-1"
PARTIES_FULL="PartyA PartyB PartyC"
PARTIES_SMALL="PartyA"
TRANSMITTALS_PER_PARTY_FULL=6
TRANSMITTALS_PER_PARTY_SMALL=2
# Each transmittal contains at least one of every extension in
# EXTENSIONS_GUARANTEED (6 of them), plus extras up to this total.
FILES_PER_TRANSMITTAL_FULL=10
FILES_PER_TRANSMITTAL_SMALL=6

PANDOC_IMAGE="docker.io/pandoc/latex:latest"

# Status / revision / extension / discipline distributions, derived
# from a 773-row sample of a real archive. Format-preserving — these
# are public ZDDC convention vocabularies, no identifying data.
STATUSES="IFR IFR IFR IFR IFR IFR IFI IFI IFU IFU IFA RSB"   # weighted
REVISIONS="A B 0 0A 0B C D"
# The full extension set per the test plan. Each transmittal gets one
# of each (so every fixture exercises every extension), then EXTRAS
# are sampled from the weighted distribution.
EXTENSIONS_GUARANTEED="md yaml pdf html zddc zip"
EXTENSIONS_WEIGHTED="pdf pdf pdf pdf md md yaml html zip zddc"
DISCIPLINES="EL PM CAL CPT TRN INT MEC SPC"
DOC_TYPES="CAL CPT TRN SPC DRW LST RPT MDL"

# Lorem-ipsum-style title fragments. No real-world references.
TITLE_WORDS="lorem ipsum dolor sit amet consectetur adipiscing elit \
sed eiusmod tempor incididunt labore magna aliqua veniam nostrud \
exercitation ullamco laboris nisi commodo duis aute irure dolore"

# Synthetic admin emails for .zddc ACLs. example.com is reserved
# (RFC 2606), guaranteed not to belong to anyone real.
ADMIN_EMAIL="admin@example.com"
USER_EMAILS="alice@example.com bob@example.com carol@example.com"

# ---------------------------------------------------------------------
# Subcommand dispatch
# ---------------------------------------------------------------------

# ---------------------------------------------------------------------
# Random-number helper. dash (POSIX /bin/sh) has no $RANDOM, so we read
# 2 bytes from /dev/urandom each call and decode to a 16-bit unsigned
# int. Fast (no exec, no awk per call) and properly random across runs.
# ---------------------------------------------------------------------
_rand() {
    od -An -N2 -tu2 /dev/urandom | tr -d ' \n'
}

usage() {
    cat <<EOF
Usage: $0 <subcommand> [--small]

Subcommands:
  build [--small]   Generate the synthetic archive (small = ~10x fewer files).
  clear             Remove the archive directory entirely.
  info              Show what's there (file count, total size, top-level layout).
  help              Print this message.

Configuration:
  TEST_ARCHIVE_DIR  Output directory (default: ~/zddc-test-data).

PDF generation:
  Uses $PANDOC_IMAGE via podman (with --userns=keep-id so output is
  owned by the host user). Falls back to plaintext PDF when podman
  is unavailable.
EOF
}

cmd="${1:-help}"
shift 2>/dev/null || true
for arg in "$@"; do
    case "$arg" in
        --small) SMALL=1 ;;
        *)       echo "unknown flag: $arg" >&2; exit 2 ;;
    esac
done

# ---------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------

# pick_word <list> — random pick from a whitespace-separated list.
pick_word() {
    list="$1"
    n=$(echo "$list" | wc -w)
    idx=$(( $(_rand) % n + 1 ))
    echo "$list" | cut -d' ' -f"$idx"
}

random_int() {
    awk -v min="$1" -v max="$2" 'BEGIN { srand(); printf "%d\n", min + int(rand() * (max - min + 1)) }'
}

# Pick a date string YYYY-MM-DD between Jan 1 of last year and today.
random_date() {
    days_back=$(awk 'BEGIN { srand(); printf "%d\n", int(rand() * 730) }')
    date -d "$days_back days ago" +%Y-%m-%d
}

# Build a 3-6-word lorem title.
random_title() {
    n=$(random_int 3 6)
    out=""
    i=0
    while [ "$i" -lt "$n" ]; do
        w=$(pick_word "$TITLE_WORDS")
        # Capitalize first letter for the first word.
        if [ "$i" = 0 ]; then
            first=$(printf '%s' "$w" | cut -c1 | tr 'a-z' 'A-Z')
            rest=$(printf '%s' "$w" | cut -c2-)
            w="${first}${rest}"
        fi
        out="${out}${out:+ }${w}"
        i=$((i + 1))
    done
    printf '%s' "$out"
}

# Synthetic tracking number: <party>-<facility>-<discipline>-<doctype>-NNNN
make_tracking() {
    party="$1"      # PartyA → A
    party_short=$(printf '%s' "$party" | sed 's/^Party//')
    facility="FAC$(random_int 1 4)"
    discipline=$(pick_word "$DISCIPLINES")
    doctype=$(pick_word "$DOC_TYPES")
    seq=$(printf '%04d' "$(random_int 1 999)")
    printf '%s-%s-%s-%s-%s' "$party_short" "$facility" "$discipline" "$doctype" "$seq"
}

# Render the metadata block in the right format for an extension.
# Args: ext, tracking, rev, status, title, outpath
render_file() {
    ext="$1"; tracking="$2"; rev="$3"; status="$4"; title="$5"; out="$6"
    case "$ext" in
        md)
            cat > "$out" <<EOF
# $tracking

| Field | Value |
|---|---|
| Tracking Number | $tracking |
| Revision | $rev |
| Status | $status |
| Title | $title |

This is a synthetic test fixture. Generated by tests/data/test-archive.sh.
EOF
            ;;
        yaml)
            cat > "$out" <<EOF
tracking_number: "$tracking"
revision: "$rev"
status: "$status"
title: "$title"
synthetic: true
generated_by: tests/data/test-archive.sh
EOF
            ;;
        html)
            cat > "$out" <<EOF
<!doctype html>
<html><head><meta charset="utf-8"><title>$tracking</title></head>
<body style="font-family:sans-serif;padding:2em">
<h1>$tracking</h1>
<table border="1" cellpadding="6" cellspacing="0">
<tr><th>Tracking Number</th><td>$tracking</td></tr>
<tr><th>Revision</th><td>$rev</td></tr>
<tr><th>Status</th><td>$status</td></tr>
<tr><th>Title</th><td>$title</td></tr>
</table>
<p><em>Synthetic test fixture. Generated by tests/data/test-archive.sh.</em></p>
</body></html>
EOF
            ;;
        zddc)
            # *.zddc as a data file (not the special config file).
            # YAML-shape since .zddc files ARE YAML.
            cat > "$out" <<EOF
# Synthetic .zddc data file (not an ACL config).
tracking_number: "$tracking"
revision: "$rev"
status: "$status"
title: "$title"
synthetic: true
EOF
            ;;
        pdf)
            render_pdf "$tracking" "$rev" "$status" "$title" "$out"
            ;;
        zip)
            render_zip "$tracking" "$rev" "$status" "$title" "$out"
            ;;
        *)
            echo "render_file: unknown extension $ext" >&2
            exit 1
            ;;
    esac
}

# Render PDF via pandoc/latex if podman is available; fall back to a
# hand-rolled minimal PDF otherwise.
render_pdf() {
    tracking="$1"; rev="$2"; status="$3"; title="$4"; out="$5"
    if [ "${PDF_BACKEND:-pandoc}" = "minimal" ] || ! command -v podman >/dev/null 2>&1; then
        render_pdf_minimal "$tracking" "$rev" "$status" "$title" "$out"
        return
    fi
    # Build a temp .md alongside, render, drop the .md.
    tmp_md="${out%.pdf}.tmp.md"
    cat > "$tmp_md" <<EOF
# $tracking

| Field | Value |
|---|---|
| Tracking Number | $tracking |
| Revision | $rev |
| Status | $status |
| Title | $title |

Synthetic test fixture. Generated by tests/data/test-archive.sh.
EOF
    # Run pandoc in container. Output dir must be writable by the
    # in-container UID; --userns=keep-id keeps it as the host user.
    dir=$(dirname "$out")
    md_base=$(basename "$tmp_md")
    pdf_base=$(basename "$out")
    if ! podman run --rm --userns=keep-id \
        -v "$dir":/data:Z \
        "$PANDOC_IMAGE" "/data/$md_base" -o "/data/$pdf_base" >/dev/null 2>&1; then
        # Pandoc failed (image missing? network blocked?). Fall back.
        rm -f "$tmp_md"
        render_pdf_minimal "$tracking" "$rev" "$status" "$title" "$out"
        return
    fi
    rm -f "$tmp_md"
}

# Hand-rolled minimal valid PDF — opens in any reader, displays the
# metadata block. ~600 bytes. Used only when pandoc isn't reachable.
render_pdf_minimal() {
    tracking="$1"; rev="$2"; status="$3"; title="$4"; out="$5"
    # PDF strings escape (, ), \ — the lorem-ipsum titles never include
    # these so a basic substitution is enough for our fixture.
    safe() { printf '%s' "$1" | sed 's/[()\\]/_/g'; }
    t=$(safe "$tracking"); r=$(safe "$rev"); s=$(safe "$status"); ti=$(safe "$title")
    python3 - "$out" "$t" "$r" "$s" "$ti" <<'PY'
import sys
out, t, r, s, ti = sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5]
text = (
    f"BT /F1 14 Tf 72 720 Td ({t}) Tj ET\n"
    f"BT /F1 12 Tf 72 700 Td (Revision: {r}) Tj ET\n"
    f"BT /F1 12 Tf 72 685 Td (Status: {s}) Tj ET\n"
    f"BT /F1 12 Tf 72 670 Td (Title: {ti}) Tj ET\n"
    f"BT /F1 10 Tf 72 640 Td (Synthetic test fixture - tests/data/test-archive.sh) Tj ET\n"
)
text_b = text.encode("latin-1", errors="replace")
objs = [
    b"<</Type/Catalog/Pages 2 0 R>>",
    b"<</Type/Pages/Kids[3 0 R]/Count 1>>",
    b"<</Type/Page/Parent 2 0 R/MediaBox[0 0 612 792]/Contents 4 0 R/Resources<</Font<</F1 5 0 R>>>>>>",
    b"<</Length " + str(len(text_b)).encode() + b">>stream\n" + text_b + b"endstream",
    b"<</Type/Font/Subtype/Type1/BaseFont/Helvetica>>",
]
buf = bytearray(b"%PDF-1.4\n%\xe2\xe3\xcf\xd3\n")
offsets = []
for i, obj in enumerate(objs, 1):
    offsets.append(len(buf))
    buf += f"{i} 0 obj\n".encode() + obj + b"\nendobj\n"
xref = len(buf)
buf += f"xref\n0 {len(objs)+1}\n".encode()
buf += b"0000000000 65535 f \n"
for o in offsets:
    buf += f"{o:010d} 00000 n \n".encode()
buf += f"trailer <</Size {len(objs)+1}/Root 1 0 R>>\nstartxref\n{xref}\n%%EOF\n".encode()
open(out, "wb").write(buf)
PY
}

# Render a .zip containing a .md, .yaml, and .html with the same
# metadata so unzipping shows three views of the same record. POSIX
# sh has no function-local scope, so nested render_file calls would
# clobber $out — copy to z_out first.
render_zip() {
    z_track="$1"; z_rev="$2"; z_status="$3"; z_title="$4"; z_out="$5"
    tmpdir=$(mktemp -d)
    render_file md   "$z_track" "$z_rev" "$z_status" "$z_title" "$tmpdir/$z_track.md"
    render_file yaml "$z_track" "$z_rev" "$z_status" "$z_title" "$tmpdir/$z_track.yaml"
    render_file html "$z_track" "$z_rev" "$z_status" "$z_title" "$tmpdir/$z_track.html"
    (cd "$tmpdir" && zip -q "$z_out" ./*)
    rm -rf "$tmpdir"
}

# Write a per-directory .zddc ACL config. Synthetic emails only.
write_zddc_config() {
    out="$1"
    role="${2:-default}"     # default | party | project
    case "$role" in
        project|party)
            cat > "$out" <<EOF
title: "Synthetic ${role} ACL — test fixture"
admins:
  - $ADMIN_EMAIL
acl:
  permissions:
    "$ADMIN_EMAIL": rwcda
    "alice@example.com": rwcd
    "bob@example.com": rw
    "carol@example.com": r
EOF
            ;;
        *)
            cat > "$out" <<EOF
title: "Synthetic root ACL — test fixture"
admins:
  - $ADMIN_EMAIL
acl:
  permissions:
    "$ADMIN_EMAIL": rwcda
    "*@example.com": r
EOF
            ;;
    esac
}

# ---------------------------------------------------------------------
# build
# ---------------------------------------------------------------------

cmd_build() {
    if [ -e "$TARGET" ]; then
        echo "$TARGET already exists. Run '$0 clear' first." >&2
        exit 1
    fi
    if [ "$SMALL" = 1 ]; then
        projects="$PROJECTS_SMALL"
        parties="$PARTIES_SMALL"
        per_party=$TRANSMITTALS_PER_PARTY_SMALL
        per_trans=$FILES_PER_TRANSMITTAL_SMALL
        echo "building SMALL fixture at $TARGET"
    else
        projects="$PROJECTS_FULL"
        parties="$PARTIES_FULL"
        per_party=$TRANSMITTALS_PER_PARTY_FULL
        per_trans=$FILES_PER_TRANSMITTAL_FULL
        echo "building FULL fixture at $TARGET"
    fi

    # 0777 on the archive dir lets the rootless-podman pandoc container
    # write PDF output regardless of UID-namespace mapping. We're in
    # $HOME so the parent dir is already access-controlled by user.
    mkdir -p "$TARGET"
    chmod 0777 "$TARGET"

    # Root .zddc — admins + read-only-for-anyone-with-an-example.com-email.
    write_zddc_config "$TARGET/.zddc" default

    file_count=0
    pdf_count=0
    for project in $projects; do
        proj_dir="$TARGET/$project"
        mkdir -p "$proj_dir"
        chmod 0777 "$proj_dir"
        write_zddc_config "$proj_dir/.zddc" project

        for party in $parties; do
            party_dir="$proj_dir/Archive/$party"
            mkdir -p "$party_dir/Received" "$party_dir/Issued"
            chmod 0777 "$party_dir" "$party_dir/Received" "$party_dir/Issued"
            write_zddc_config "$party_dir/.zddc" party

            i=0
            while [ "$i" -lt "$per_party" ]; do
                i=$((i + 1))
                # Alternate Received / Issued.
                if [ $((i % 2)) = 0 ]; then
                    bucket="Received"
                else
                    bucket="Issued"
                fi
                # Transmittal envelope: <date>_<tracking> (<status>) - <title>
                t_track=$(make_tracking "$party")
                t_status=$(pick_word "$STATUSES")
                t_title=$(random_title)
                t_date=$(random_date)
                t_dir="$party_dir/$bucket/${t_date}_${t_track} (${t_status}) - ${t_title}"
                mkdir -p "$t_dir"
                chmod 0777 "$t_dir"

                # Build the per-transmittal extension list: every
                # extension in EXTENSIONS_GUARANTEED at least once,
                # then weighted-random extras to reach per_trans total.
                file_exts="$EXTENSIONS_GUARANTEED"
                guaranteed_count=$(echo "$file_exts" | wc -w)
                extras=$((per_trans - guaranteed_count))
                if [ "$extras" -gt 0 ]; then
                    k=0
                    while [ "$k" -lt "$extras" ]; do
                        file_exts="$file_exts $(pick_word "$EXTENSIONS_WEIGHTED")"
                        k=$((k + 1))
                    done
                fi

                for f_ext in $file_exts; do
                    f_track=$(make_tracking "$party")
                    f_rev=$(pick_word "$REVISIONS")
                    f_status=$(pick_word "$STATUSES")
                    f_title=$(random_title)
                    # Filename per ZDDC convention.
                    f_name="${f_track}_${f_rev} (${f_status}) - ${f_title}.${f_ext}"
                    f_path="$t_dir/$f_name"
                    render_file "$f_ext" "$f_track" "$f_rev" "$f_status" "$f_title" "$f_path"
                    file_count=$((file_count + 1))
                    if [ "$f_ext" = "pdf" ]; then
                        pdf_count=$((pdf_count + 1))
                    fi
                done
            done
        done
    done

    echo "built: $file_count files ($pdf_count PDFs) at $TARGET"
    echo "info:  $0 info"
}

# ---------------------------------------------------------------------
# clear
# ---------------------------------------------------------------------

cmd_clear() {
    if [ ! -e "$TARGET" ]; then
        echo "$TARGET does not exist; nothing to clear"
        return 0
    fi
    # Defense in depth: refuse to rm anything that doesn't look like
    # a test-archive directory.
    if [ ! -f "$TARGET/.zddc" ]; then
        echo "$TARGET does not contain a .zddc — refusing to rm" >&2
        echo "(set TEST_ARCHIVE_DIR explicitly if your fixture lives elsewhere)" >&2
        exit 1
    fi
    rm -rf "$TARGET"
    echo "cleared $TARGET"
}

# ---------------------------------------------------------------------
# info
# ---------------------------------------------------------------------

cmd_info() {
    if [ ! -e "$TARGET" ]; then
        echo "$TARGET does not exist (run '$0 build' first)"
        return 0
    fi
    echo "fixture: $TARGET"
    files=$(find "$TARGET" -type f | wc -l)
    bytes=$(du -sb "$TARGET" 2>/dev/null | awk '{print $1}')
    echo "files:   $files"
    if [ -n "$bytes" ]; then
        # Format bytes as KB/MB.
        awk -v b="$bytes" 'BEGIN {
            if (b < 1024) printf "size:    %d B\n", b
            else if (b < 1048576) printf "size:    %.1f KB\n", b / 1024
            else printf "size:    %.1f MB\n", b / 1048576
        }'
    fi
    echo "by extension:"
    find "$TARGET" -type f -name '*.*' | sed -E 's/.*\.([a-z]+)$/\1/' | sort | uniq -c | sort -rn | head | awk '{printf "  %5d %s\n", $1, $2}'
    echo "top-level layout:"
    find "$TARGET" -maxdepth 3 -mindepth 1 -type d | sed "s|^$TARGET|  .|" | head -20
}

case "$cmd" in
    build) cmd_build ;;
    clear) cmd_clear ;;
    info)  cmd_info ;;
    help|-h|--help) usage ;;
    *) echo "unknown subcommand: $cmd" >&2; usage; exit 2 ;;
esac