#!/usr/bin/env bash
# SessionStart hook for code-guide plugin.
# Reads ALL skills/*/SKILL.md files and injects them as additionalContext
# so every best-practice guide is always active from turn 1.
#
# Pattern: identical to explanatory-output-style's session-start hook
# which injects educational-output instructions into context.
# Instead of one static message, we dynamically iterate over all skills.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"

# Build combined content from all SKILL.md files.
combined=""
while IFS= read -r -d '' skill_file; do
    skill_name=$(basename "$(dirname "$skill_file")")
    content=$(cat "$skill_file")
    # Append skill with header separator — uses $'...' for real newlines
    combined="${combined}"$'\n\n\n'"===== code-guide:${skill_name} ====="$'\n\n'"${content}"
done < <(find "${PLUGIN_ROOT}/skills" -name 'SKILL.md' -print0 | sort -z)

intro=$'You have the code-guide plugin loaded with all best-practice guides directly injected.\nThe following skills are ALWAYS active in context — no manual invocation needed.\nWhen the current task matches a skill\'s domain, apply its guidance automatically.\n'

full_context="<CODE_GUIDE_SKILLS>
${intro}
${combined}
</CODE_GUIDE_SKILLS>"

# JSON-escape the full context: \ → \\, " → \", newline → \n, etc.
escape_for_json() {
    local s="$1"
    s="${s//\\/\\\\}"
    s="${s//\"/\\\"}"
    s="${s//$'\n'/\\n}"
    s="${s//$'\r'/\\r}"
    s="${s//$'\t'/\\t}"
    printf '%s' "$s"
}

escaped=$(escape_for_json "$full_context")

if [ -n "${CLAUDE_PLUGIN_ROOT:-}" ]; then
  printf '{"hookSpecificOutput":{"hookEventName":"SessionStart","additionalContext":"%s"}}\n' "$escaped"
else
  printf '{"additionalContext":"%s"}\n' "$escaped"
fi

exit 0