#!/usr/bin/env fish
# copilot-update.fish
# Zieht die neueste Version des Copilot-Setup-Repos und aktualisiert:
#   - Dieses Script selbst (~/.local/bin/copilot-update.fish)
#   - Globale Git-Templates (~/.git-templates/)
#   - VS Code Prompt-Dateien
#   - Git-Hooks im aktuellen Repo (pre-commit)
#   - .github/copilot-instructions.md (Framework-Sektion immer, Projekt-Teil bleibt)
#
# Usage:
#   fish ~/.local/bin/copilot-update.fish
#   git copilot-update   (via Alias, ruft copilot-update.sh auf)

# ── Konfiguration laden: env > config-file > leer ─────────────────────────
# Env-Variablen (Vorrang):
#   COPILOT_SETUP_REMOTE_SSH / _HTTP   Remote-URLs des Setup-Repos
#   COPILOT_SETUP_DIR                  lokaler Klon/Arbeitskopie (Offline)
#   COPILOT_SETUP_CONFIG               alternativer Pfad zur Config-Datei
# Config-Datei (sh-Syntax KEY="value", wird geparst): $XDG_CONFIG_HOME/copilot-setup/config
# Standalone-Skript -> keine gemeinsame Lib sourcebar; gleiche Aufloesung in deploy.fish.

# Wert fuer KEY aus sh-style Config lesen (KEY="value" | KEY=value); letzte Definition gewinnt
function _cfg_get --argument-names file key
    test -f "$file"; or return 1
    set -l line (grep -E "^[[:space:]]*$key=" "$file" 2>/dev/null | tail -n1)
    test -n "$line"; or return 1
    set -l val (string replace -r "^[[:space:]]*$key=" '' -- $line)
    set val (string trim -- $val)
    set val (string trim --chars '"' -- $val)
    set val (string trim --chars "'" -- $val)
    printf '%s' $val
end

# VS Code User-Verzeichnis portabel ueber Editionen/OS ermitteln (identisch zu deploy.fish)
function detect_vscode_user_dir
    for d in \
        "$HOME/.vscode-server/data/User" \
        "$HOME/.vscode-server-insiders/data/User" \
        "$HOME/Library/Application Support/Code/User" \
        "$HOME/Library/Application Support/Code - Insiders/User" \
        "$HOME/Library/Application Support/VSCodium/User" \
        "$HOME/Library/Application Support/Cursor/User" \
        "$HOME/.config/Code/User" \
        "$HOME/.config/Code - Insiders/User" \
        "$HOME/.config/VSCodium/User" \
        "$HOME/.config/Cursor/User" \
        "$HOME/.var/app/com.visualstudio.code/config/Code/User" \
        "/mnt/c/Users/$USER/AppData/Roaming/Code/User" \
        "/mnt/c/Users/$USER/AppData/Roaming/Code - Insiders/User"
        if test -d "$d"
            echo $d
            return 0
        end
    end
    switch (uname -s)
        case Darwin
            echo "$HOME/Library/Application Support/Code/User"
        case '*'
            echo "$HOME/.config/Code/User"
    end
end

# Config-Datei-Pfad bestimmen
if set -q COPILOT_SETUP_CONFIG
    set CONFIG_FILE $COPILOT_SETUP_CONFIG
else if set -q XDG_CONFIG_HOME
    set CONFIG_FILE $XDG_CONFIG_HOME/copilot-setup/config
else
    set CONFIG_FILE $HOME/.config/copilot-setup/config
end

# Remote/Cache aufloesen: env hat Vorrang, sonst Config, sonst Default
if set -q COPILOT_SETUP_REMOTE_SSH; and test -n "$COPILOT_SETUP_REMOTE_SSH"
    set SETUP_REPO_SSH $COPILOT_SETUP_REMOTE_SSH
else
    set SETUP_REPO_SSH (_cfg_get $CONFIG_FILE COPILOT_SETUP_REMOTE_SSH)
end

if set -q COPILOT_SETUP_REMOTE_HTTP; and test -n "$COPILOT_SETUP_REMOTE_HTTP"
    set SETUP_REPO_HTTP $COPILOT_SETUP_REMOTE_HTTP
else
    set SETUP_REPO_HTTP (_cfg_get $CONFIG_FILE COPILOT_SETUP_REMOTE_HTTP)
end

if set -q COPILOT_SETUP_DIR; and test -n "$COPILOT_SETUP_DIR"
    set CACHE_DIR $COPILOT_SETUP_DIR
else
    set CACHE_DIR (_cfg_get $CONFIG_FILE COPILOT_SETUP_DIR)
    test -n "$CACHE_DIR"; or set CACHE_DIR $HOME/.copilot-setup
end

echo "=== Copilot Update ==="

# ── 1. Setup-Repo Cache aktuell halten ───────────────────────────────────────
set HAVE_REMOTE 0
if test -n "$SETUP_REPO_SSH"; or test -n "$SETUP_REPO_HTTP"
    set HAVE_REMOTE 1
end

set SOURCE_OK 0
if test -d $CACHE_DIR/.git
    if test $HAVE_REMOTE -eq 1
        echo "  → Pulling latest from setup repo..."
        if git -C $CACHE_DIR pull --ff-only --quiet 2>/dev/null
            echo "  ✓ Cache aktualisiert: $CACHE_DIR"
        else
            echo "  ⚠ git pull fehlgeschlagen – nutze vorhandenen Cache (offline)"
        end
    else
        echo "  ─ Kein Remote konfiguriert – nutze lokalen Klon: $CACHE_DIR"
    end
    set SOURCE_OK 1
else if test -d $CACHE_DIR/git-templates
    echo "  ─ Lokale Setup-Quelle ohne .git (Offline-Betrieb): $CACHE_DIR"
    set SOURCE_OK 1
else
    if test -n "$SETUP_REPO_SSH"
        echo "  → Klone Setup-Repo (SSH)..."
        if git clone --quiet $SETUP_REPO_SSH $CACHE_DIR 2>/dev/null
            echo "  ✓ Geklont via SSH"
            set SOURCE_OK 1
        else
            echo "  ✗ SSH fehlgeschlagen"
        end
    end
    if test $SOURCE_OK -eq 0; and test -n "$SETUP_REPO_HTTP"
        echo "  → Klone Setup-Repo (HTTP)..."
        if git clone --quiet $SETUP_REPO_HTTP $CACHE_DIR 2>/dev/null
            echo "  ✓ Geklont via HTTP"
            set SOURCE_OK 1
        else
            echo "  ✗ HTTP fehlgeschlagen"
        end
    end
end

if test $SOURCE_OK -eq 0
    echo ""
    echo "  ⚠ Keine Setup-Quelle verfuegbar – Update uebersprungen."
    if test $HAVE_REMOTE -eq 1
        echo "    Remote nicht erreichbar:"
        test -n "$SETUP_REPO_SSH"; and echo "      SSH:  $SETUP_REPO_SSH"
        test -n "$SETUP_REPO_HTTP"; and echo "      HTTP: $SETUP_REPO_HTTP"
    else
        echo "    Kein Remote konfiguriert. Setze COPILOT_SETUP_REMOTE_SSH/_HTTP,"
        echo "    COPILOT_SETUP_DIR (lokaler Klon) oder lege $CONFIG_FILE an."
    end
    echo "    (Kein Fehler – ohne Quelle gibt es nichts zu aktualisieren.)"
    exit 0
end

set SOURCE $CACHE_DIR

# ── 1b. Self-update ──────────────────────────────────────────────────────
set SELF $HOME/.local/bin/copilot-update.fish
if test -f $SOURCE/scripts/copilot-update.fish
    if not diff -q $SOURCE/scripts/copilot-update.fish $SELF >/dev/null 2>&1
        cp $SOURCE/scripts/copilot-update.fish $SELF
        chmod +x $SELF
        echo "  ✓ copilot-update.fish selbst aktualisiert – starte neue Version..."
        exec fish $SELF $argv
    end
end

# ── 2. ~/.git-templates/ aktualisieren ──────────────────────────────────────
set GIT_TEMPLATE_DIR $HOME/.git-templates
mkdir -p $GIT_TEMPLATE_DIR/.github $GIT_TEMPLATE_DIR/.vscode \
         $GIT_TEMPLATE_DIR/hooks   $GIT_TEMPLATE_DIR/docs \
         $GIT_TEMPLATE_DIR/history/summary

cp $SOURCE/git-templates/.github/copilot-instructions.md $GIT_TEMPLATE_DIR/.github/
cp $SOURCE/git-templates/.vscode/settings.json           $GIT_TEMPLATE_DIR/.vscode/
cp $SOURCE/git-templates/.vscode/extensions.json         $GIT_TEMPLATE_DIR/.vscode/
cp $SOURCE/git-templates/hooks/pre-commit                $GIT_TEMPLATE_DIR/hooks/
chmod +x $GIT_TEMPLATE_DIR/hooks/pre-commit
if test -f $SOURCE/git-templates/hooks/post-merge
    cp $SOURCE/git-templates/hooks/post-merge $GIT_TEMPLATE_DIR/hooks/
    chmod +x $GIT_TEMPLATE_DIR/hooks/post-merge
end
cp $SOURCE/git-templates/docs/USER.md       $GIT_TEMPLATE_DIR/docs/
cp $SOURCE/git-templates/docs/ADMIN.md      $GIT_TEMPLATE_DIR/docs/
cp $SOURCE/git-templates/docs/MAINTAINER.md $GIT_TEMPLATE_DIR/docs/
cp $SOURCE/git-templates/history/summary/PROJECT_CONTEXT.md $GIT_TEMPLATE_DIR/history/summary/

echo "  ✓ ~/.git-templates/ aktualisiert"

# ── 3. VS Code Prompt-Dateien aktualisieren ───────────────────────────────────
set VSCODE_USER (detect_vscode_user_dir)

if test -d "$VSCODE_USER"
    mkdir -p $VSCODE_USER/prompts
    set PROMPTS_UPDATED 0
    for f in $SOURCE/prompts/*.prompt.md
        set fname (basename $f)
        cp $f $VSCODE_USER/prompts/$fname
        set PROMPTS_UPDATED (math $PROMPTS_UPDATED + 1)
    end
    echo "  ✓ $PROMPTS_UPDATED Prompt-Dateien aktualisiert → $VSCODE_USER/prompts/"
else
    echo "  ─ VS Code User-Verzeichnis nicht gefunden, Prompts übersprungen"
end

# ── 4. Repo-lokale Updates (nur wenn in einem Git-Repo) ──────────────────────
set REPO_ROOT (git rev-parse --show-toplevel 2>/dev/null)

if test -z "$REPO_ROOT"
    echo ""
    echo "  ─ Kein Git-Repo erkannt – repo-lokale Updates übersprungen"
    echo ""
    echo "=== Done ==="
    exit 0
end

echo ""
echo "  Git-Repo erkannt: $REPO_ROOT"

# ── 4a. Git-Hooks aktualisieren ───────────────────────────────────────────────
set HOOKS_DIR $REPO_ROOT/.git/hooks
mkdir -p $HOOKS_DIR
set HOOKS_UPDATED 0

for hook in pre-commit
    if test -f $SOURCE/git-templates/hooks/$hook
        cp $SOURCE/git-templates/hooks/$hook $HOOKS_DIR/$hook
        chmod +x $HOOKS_DIR/$hook
        set HOOKS_UPDATED (math $HOOKS_UPDATED + 1)
        echo "  ✓ .git/hooks/$hook aktualisiert"
    end
end

if test $HOOKS_UPDATED -eq 0
    echo "  ─ Keine Hook-Templates gefunden"
end

# ── 4b. copilot-instructions.md: Framework-Sektion immer aktualisieren ─────────
set COPILOT_INSTRUCTIONS $REPO_ROOT/.github/copilot-instructions.md
set TEMPLATE_INSTRUCTIONS $SOURCE/git-templates/.github/copilot-instructions.md

if test -f $COPILOT_INSTRUCTIONS; and test -f $TEMPLATE_INSTRUCTIONS
    set framework (awk '/^---$/{exit} {print}' $TEMPLATE_INSTRUCTIONS)
    set project (awk '/^---$/{found=1} found{print}' $COPILOT_INSTRUCTIONS)
    if test -n "$project"
        printf '%s\n\n%s\n' (string join \n $framework) (string join \n $project) > $COPILOT_INSTRUCTIONS
        echo "  ✓ .github/copilot-instructions.md Framework-Sektion aktualisiert"
    else
        cp $TEMPLATE_INSTRUCTIONS $COPILOT_INSTRUCTIONS
        echo "  ✓ .github/copilot-instructions.md aktualisiert (noch nicht angepasst)"
    end
else
    echo "  ─ .github/copilot-instructions.md nicht vorhanden, übersprungen"
end

# ── 4c. Fehlende 3-Zielgruppen-Docs anlegen (nur wenn noch nicht vorhanden) ──
if test -d $REPO_ROOT/docs
    set DOCS_CREATED 0
    for doc in USER.md ADMIN.md MAINTAINER.md
        if not test -f $REPO_ROOT/docs/$doc; and test -f $GIT_TEMPLATE_DIR/docs/$doc
            cp $GIT_TEMPLATE_DIR/docs/$doc $REPO_ROOT/docs/$doc
            echo "  ✓ docs/$doc angelegt (Template)"
            set DOCS_CREATED (math $DOCS_CREATED + 1)
        end
    end
    if test $DOCS_CREATED -eq 0
        echo "  ─ docs/ 3-Zielgruppen-Docs bereits vorhanden"
    end
end

echo ""
echo "=== Done ==="
echo "Tipp: 'git copilot-update' jederzeit ausführen um Templates aktuell zu halten."