#!/usr/bin/env bash
# Interactive demo launcher for pikl-menu.
# Uses pikl to pick a scenario, then runs that scenario in pikl.
#
# Usage: ./examples/demo.sh

set -euo pipefail

# Resolve the pikl binary once up front.
if [[ -n "${PIKL:-}" ]]; then
    PIKL_BIN="$PIKL"
elif command -v pikl >/dev/null 2>&1; then
    PIKL_BIN="pikl"
else
    # Build quietly, use the debug binary directly.
    cargo build --quiet 2>&1
    PIKL_BIN="cargo run --quiet --"
fi

# Wrapper so scenarios can just call `pikl` with args.
pikl() {
    $PIKL_BIN "$@"
}

# ── Scenario runners ──────────────────────────────────────

plain_list() {
    printf "apple\nbanana\ncherry\ndate\nelderberry\nfig\ngrape\nhoneydew\n" \
        | pikl
}

big_list() {
    # seq output is wrapped as JSON strings so they get
    # proper labels (bare numbers parse as JSON numbers
    # with empty display text).
    seq 1 500 | sed 's/.*/"&"/' | pikl
}

json_objects() {
    cat <<'ITEMS' | pikl
{"label": "Arch Linux", "category": "rolling", "init": "systemd"}
{"label": "NixOS", "category": "rolling", "init": "systemd"}
{"label": "Void Linux", "category": "rolling", "init": "runit"}
{"label": "Debian", "category": "stable", "init": "systemd"}
{"label": "Alpine", "category": "stable", "init": "openrc"}
{"label": "Fedora", "category": "semi-rolling", "init": "systemd"}
{"label": "Gentoo", "category": "rolling", "init": "openrc"}
ITEMS
}

custom_label_key() {
    cat <<'ITEMS' | pikl --label-key name
{"name": "Neovim", "type": "editor", "lang": "C/Lua"}
{"name": "Helix", "type": "editor", "lang": "Rust"}
{"name": "Kakoune", "type": "editor", "lang": "C++"}
{"name": "Emacs", "type": "editor", "lang": "Lisp"}
{"name": "Vim", "type": "editor", "lang": "C"}
ITEMS
}

git_branches() {
    if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
        echo "not in a git repo" >&2
        return 1
    fi
    git branch --format='%(refname:short)' | pikl
}

git_log_picker() {
    if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
        echo "not in a git repo" >&2
        return 1
    fi
    git log --oneline -30 | pikl
}

file_picker() {
    find . -maxdepth 3 -type f \
        -not -path './.git/*' \
        -not -path './target/*' \
        -not -name '*.lock' \
        | sort \
        | pikl
}

on_select_hook() {
    printf "one\ntwo\nthree\nfour\nfive\n" \
        | pikl --on-select 'echo "you picked: $(cat)"'
}

mixed_input() {
    cat <<'ITEMS' | pikl
just a plain string
{"label": "a json object", "extra": 42}
another plain string
{"label": "second object", "extra": 99}
ITEMS
}

# ── Scenario menu ─────────────────────────────────────────

scenarios=(
    "Plain text list"
    "Big list (500 items)"
    "JSON objects (distros)"
    "Custom --label-key (editors)"
    "Git branches"
    "Git log (last 30)"
    "File picker"
    "on-select hook"
    "Mixed input (plain + JSON)"
)

# Map display names to functions
run_scenario() {
    case "$1" in
        *"Plain text"*)     plain_list ;;
        *"Big list"*)       big_list ;;
        *"JSON objects"*)   json_objects ;;
        *"label-key"*)      custom_label_key ;;
        *"Git branches"*)   git_branches ;;
        *"Git log"*)        git_log_picker ;;
        *"File picker"*)    file_picker ;;
        *"on-select"*)      on_select_hook ;;
        *"Mixed input"*)    mixed_input ;;
        *)
            echo "unknown scenario" >&2
            return 1
            ;;
    esac
}

# ── Main ──────────────────────────────────────────────────

main() {
    echo "pikl demo launcher" >&2
    echo "pick a scenario, then interact with it" >&2
    echo "" >&2

    choice=$(printf '%s\n' "${scenarios[@]}" | pikl) || {
        echo "cancelled" >&2
        exit 1
    }

    # pikl outputs JSON. Strip the quotes for matching.
    choice=$(echo "$choice" | tr -d '"')

    echo "" >&2
    echo "── running: $choice ──" >&2
    echo "" >&2

    result=$(run_scenario "$choice") || exit $?

    echo "" >&2
    echo "── result ──" >&2
    echo "$result"
}

main "$@"