#!/usr/bin/env bash
set -euo pipefail

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
PASS=0
FAIL=0

pass() { echo "  PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "  FAIL: $1"; FAIL=$((FAIL + 1)); }

TEMP_HOME="$(mktemp -d)"
trap 'rm -rf "$TEMP_HOME"' EXIT

echo "Running install.sh..."
HOME="$TEMP_HOME" bash "$REPO_ROOT/scripts/install.sh" > /dev/null

echo ""
echo "--- providers/claude-code/ → ~/.claude/ ---"
while IFS= read -r -d '' src; do
    rel="${src#"$REPO_ROOT/providers/claude-code/"}"
    # provider-manifest.sh is sourced by install.sh, not deployed to ~/.claude/
    [[ "$rel" == "provider-manifest.sh" ]] && continue
    dest="$TEMP_HOME/.claude/$rel"
    if diff -q "$src" "$dest" > /dev/null 2>&1; then
        pass "$rel deployed and matches source"
    else
        fail "$rel — missing or differs from source"
    fi
done < <(find "$REPO_ROOT/providers/claude-code" -type f -print0)

echo ""
echo "--- core/ → ~/.claude/core/ ---"
while IFS= read -r -d '' src; do
    rel="${src#"$REPO_ROOT/core/"}"
    dest="$TEMP_HOME/.claude/core/$rel"
    if diff -q "$src" "$dest" > /dev/null 2>&1; then
        pass "$rel deployed and matches source"
    else
        fail "$rel — missing or differs from source"
    fi
done < <(find "$REPO_ROOT/core" -type f -print0)

echo ""
echo "--- no orphaned files in core/ ---"
while IFS= read -r -d '' deployed; do
    rel="${deployed#"$TEMP_HOME/.claude/core/"}"
    src="$REPO_ROOT/core/$rel"
    if [[ -f "$src" ]]; then
        pass "core/$rel has a source file"
    else
        fail "core/$rel is orphaned — deleted from source but still deployed"
    fi
done < <(find "$TEMP_HOME/.claude/core" -type f -print0)

echo ""
echo "--- core/AGENTS.md → ~/.agents/AGENTS.md (0015) ---"
if diff -q "$REPO_ROOT/core/AGENTS.md" "$TEMP_HOME/.agents/AGENTS.md" > /dev/null 2>&1; then
    pass "core/AGENTS.md deployed and matches source"
else
    fail "~/.agents/AGENTS.md — missing or differs from source"
fi

echo ""
echo "--- skills deployed to ~/.agents/skills/ ---"
while IFS= read -r -d '' src_skill; do
    skill_name="$(basename "$src_skill")"
    dest_skill="$TEMP_HOME/.agents/skills/$skill_name"
    if [[ -d "$dest_skill" ]]; then
        pass "$skill_name deployed to ~/.agents/skills/"
    else
        fail "$skill_name missing from ~/.agents/skills/"
    fi
done < <(find "$REPO_ROOT/.agents/skills" -mindepth 1 -maxdepth 1 -type d -print0)

echo ""
echo "--- skill files match source ---"
while IFS= read -r -d '' src; do
    rel="${src#"$REPO_ROOT/.agents/skills/"}"
    dest="$TEMP_HOME/.agents/skills/$rel"
    if diff -q "$src" "$dest" > /dev/null 2>&1; then
        pass "skills/$rel matches source"
    else
        fail "skills/$rel — missing or differs from source"
    fi
done < <(find "$REPO_ROOT/.agents/skills" -type f -print0)

echo ""
echo "--- provider adapter: ~/.claude/skills/ is a symlink to ~/.agents/skills/ ---"
adapter="$TEMP_HOME/.claude/skills"
skills_canonical="$TEMP_HOME/.agents/skills"
if [[ -L "$adapter" ]]; then
    resolved="$(readlink "$adapter")"
    if [[ "$resolved" == "$skills_canonical" ]]; then
        pass "~/.claude/skills → ~/.agents/skills (correct target)"
    else
        fail "~/.claude/skills symlink points to wrong target: $resolved"
    fi
else
    fail "~/.claude/skills is not a symlink"
fi

echo ""
echo "--- skills correctly replaced on second install (no double-nesting) ---"
skill_name="$(basename "$(find "$REPO_ROOT/.agents/skills" -mindepth 1 -maxdepth 1 -type d | head -1)")"
nested="$TEMP_HOME/.agents/skills/$skill_name/$skill_name"
if [[ -d "$nested" ]]; then
    fail "$skill_name/$skill_name exists — skill was nested instead of replaced"
else
    pass "$skill_name not double-nested after second install"
fi

echo ""
echo "--- user skills preserved after install (merge, not wipe) ---"
TEMP_HOME2="$(mktemp -d)"
trap 'rm -rf "$TEMP_HOME2"' EXIT
# Pre-create a user skill not in the source
mkdir -p "$TEMP_HOME2/.agents/skills/my-custom-skill"
echo "custom" > "$TEMP_HOME2/.agents/skills/my-custom-skill/SKILL.md"
HOME="$TEMP_HOME2" bash "$REPO_ROOT/scripts/install.sh" > /dev/null
if [[ -f "$TEMP_HOME2/.agents/skills/my-custom-skill/SKILL.md" ]]; then
    pass "pre-existing user skill preserved after install"
else
    fail "pre-existing user skill was wiped by install"
fi

echo ""
echo "--- warning emitted when adapter target is a real directory ---"
TEMP_HOME3="$(mktemp -d)"
trap 'rm -rf "$TEMP_HOME3"' EXIT
mkdir -p "$TEMP_HOME3/.claude/skills/some-user-skill"
output="$(HOME="$TEMP_HOME3" bash "$REPO_ROOT/scripts/install.sh" 2>&1)"
if echo "$output" | grep -q "Warning"; then
    pass "warning emitted when ~/.claude/skills exists as real directory"
else
    fail "no warning when ~/.claude/skills is a real directory"
fi
if [[ -d "$TEMP_HOME3/.claude/skills/some-user-skill" ]]; then
    pass "real directory left intact when warning emitted"
else
    fail "real directory was destroyed despite warning"
fi

echo ""
echo "--- idempotency: second run state is correct ---"
HOME="$TEMP_HOME" bash "$REPO_ROOT/scripts/install.sh" > /dev/null 2>&1 \
    && pass "second run exits zero" \
    || fail "second run failed"

# skill files still match source after second run
while IFS= read -r -d '' src; do
    rel="${src#"$REPO_ROOT/.agents/skills/"}"
    dest="$TEMP_HOME/.agents/skills/$rel"
    if diff -q "$src" "$dest" > /dev/null 2>&1; then
        pass "idempotent: skills/$rel correct after second install"
    else
        fail "idempotent: skills/$rel corrupted after second install"
    fi
done < <(find "$REPO_ROOT/.agents/skills" -type f -print0)

# no double-nesting after second run
while IFS= read -r -d '' skill_dir; do
    skill_name="$(basename "$skill_dir")"
    nested="$TEMP_HOME/.agents/skills/$skill_name/$skill_name"
    if [[ -d "$nested" ]]; then
        fail "idempotent: $skill_name double-nested after second install"
    else
        pass "idempotent: $skill_name not double-nested after second install"
    fi
done < <(find "$REPO_ROOT/.agents/skills" -mindepth 1 -maxdepth 1 -type d -print0)

# symlink still correct after second run
adapter="$TEMP_HOME/.claude/skills"
if [[ -L "$adapter" ]] && [[ "$(readlink "$adapter")" == "$TEMP_HOME/.agents/skills" ]]; then
    pass "idempotent: ~/.claude/skills symlink intact after second install"
else
    fail "idempotent: ~/.claude/skills symlink broken after second install"
fi

# AGENTS.md still correct after second run
if diff -q "$REPO_ROOT/core/AGENTS.md" "$TEMP_HOME/.agents/AGENTS.md" > /dev/null 2>&1; then
    pass "idempotent: ~/.agents/AGENTS.md correct after second install"
else
    fail "idempotent: ~/.agents/AGENTS.md corrupted after second install"
fi

echo ""
echo "Results: $PASS passed, $FAIL failed"
[[ $FAIL -eq 0 ]]