#!/usr/bin/env sh
#
# La Growth Machine — GTM Skills + MCP bootstrap installer
#
# Usage:
#   curl -fsSL https://raw.githubusercontent.com/LaGrowthMachine/gtm-system/main/install.sh | sh
#
# Or, for the security-conscious — review before running:
#   curl -fsSL https://raw.githubusercontent.com/LaGrowthMachine/gtm-system/main/install.sh -o lgm-install.sh
#   less lgm-install.sh
#   sh lgm-install.sh
#
# What it does (in order):
#   1. Checks Node.js / npx are available.
#   2. Installs LGM GTM Skills via `npx skills add` (claude-code, cursor, codex).
#   3. Registers the LGM MCP in Claude Code via `claude mcp add --scope user
#      --transport http`. Auth is handled by the MCP itself: on first use a
#      browser tab opens to sign in to La Growth Machine (OAuth) — no API key
#      to copy, nothing to paste.
#   4. Prints suggested first-step prompts and a soft "star the repo" nudge.
#
# Honors:
#   LGM_INSTALL_NO_CLAUDE_PERMS=1  — skip the Claude MCP setup entirely.
#   LGM_INSTALL_NO_LAUNCH=1        — skip the final launch message.
#   LGM_INSTALL_VERBOSE=1          — show the full output of npx / claude commands
#                                    (instead of silencing it) — useful for debugging.

set -eu

SCRIPT_VERSION="2026.06.16.1"
MCP_URL="https://mcp.lagrowthmachine.com"
MCP_ALIAS="LaGrowthMachine"
SKILLS_PKG="LaGrowthMachine/gtm-system"

# UTM-tagged URLs — `utm_source=github` matches the repo README convention,
# `utm_medium=installer` distinguishes this entry point from the README, and
# `utm_content` identifies the specific link the user clicked.
REGISTER_URL="https://app.lagrowthmachine.com/register/?utm_source=github&utm_medium=installer&utm_campaign=gtm-system-installer&utm_content=register"
REPO_URL="https://github.com/LaGrowthMachine/gtm-system"

# ─────────────────────────────────────────────────────────────────────
# Output helpers
# ─────────────────────────────────────────────────────────────────────
if [ -t 1 ]; then
  RESET="\033[0m"
  GREEN="\033[32m"
  CYAN="\033[36m"
  YELLOW="\033[33m"
  RED="\033[31m"
  GREY="\033[90m"
else
  RESET=""; GREEN=""; CYAN=""; YELLOW=""; RED=""; GREY=""
fi

say()  { printf "%b\n" "$*"; }
warn() { printf "%b\n" "${YELLOW}$*${RESET}" >&2; }
fail() { printf "%b\n" "${RED}$*${RESET}" >&2; exit 1; }

# Run a command, silencing its output unless LGM_INSTALL_VERBOSE=1.
# Keeps the happy path clean while leaving a debug escape hatch for support.
#
# stdin is redirected from /dev/null so the command can't consume the script
# itself when this installer is piped (curl ... | sh) — otherwise npx would
# swallow the rest of the script and the MCP step would never run.
run_quiet() {
  if [ "${LGM_INSTALL_VERBOSE:-0}" = "1" ]; then
    "$@" </dev/null
  else
    "$@" </dev/null >/dev/null 2>&1
  fi
}

print_logo() {
  if [ -t 1 ]; then
    say "${CYAN}"
    say "  ██╗      ██████╗ ███╗   ███╗"
    say "  ██║     ██╔════╝ ████╗ ████║"
    say "  ██║     ██║  ███╗██╔████╔██║"
    say "  ██║     ██║   ██║██║╚██╔╝██║"
    say "  ███████╗╚██████╔╝██║ ╚═╝ ██║"
    say "  ╚══════╝ ╚═════╝ ╚═╝     ╚═╝"
    say "${RESET}"
    say "${GREY}  GTM Skills + MCP installer ${SCRIPT_VERSION}${RESET}"
    say ""
  fi
}

# Tracks whether MCP config got written (controls the final hints)
LGM_MCP_CONFIGURED=0

# ─────────────────────────────────────────────────────────────────────
# Step 1 — check Node.js / npx
# ─────────────────────────────────────────────────────────────────────
ensure_node() {
  command -v node >/dev/null 2>&1 || fail "Node.js is required. Install from https://nodejs.org/ and re-run."
  command -v npx  >/dev/null 2>&1 || fail "npx is required (ships with Node.js ≥ 5.2). Re-install Node from https://nodejs.org/."
  say "${GREEN}✓ Node.js $(node -v) detected.${RESET}"
}

# ─────────────────────────────────────────────────────────────────────
# Step 2 — install GTM Skills (claude-code, cursor, codex)
# ─────────────────────────────────────────────────────────────────────
install_skills() {
  say "${GREY}  Installing LGM GTM Skills for claude-code, cursor, codex...${RESET}"
  if run_quiet npx --yes skills add "$SKILLS_PKG" \
       --agents claude-code cursor codex \
       --global --yes; then
    say "${GREEN}✓ LGM GTM Skills installed.${RESET}"
  else
    warn "  Skill install failed. Run manually:"
    warn "    npx skills add ${SKILLS_PKG} --agents claude-code cursor codex --global --yes"
  fi
}

# ─────────────────────────────────────────────────────────────────────
# Step 3 — register the LGM MCP with Claude Code
#
# Uses Claude Code's native HTTP MCP transport via `claude mcp add`.
# The MCP authenticates itself: on first use a browser tab opens to sign in
# to La Growth Machine (OAuth). No API key, no Bearer header, nothing to paste —
# so this works the same whether the installer runs interactively or headless.
# New to LGM? The sign-in tab lets you create a free account on the spot.
# ─────────────────────────────────────────────────────────────────────
register_mcp() {
  [ "${LGM_INSTALL_NO_CLAUDE_PERMS:-0}" = "1" ] && return 0

  # The canonical method requires the `claude` CLI. If absent, surface the
  # one-line command the user can run later, and don't fail the installer.
  if ! command -v claude >/dev/null 2>&1; then
    say ""
    warn "  Claude Code CLI not found — can't auto-register the LGM MCP."
    warn "  Install Claude Code: https://claude.ai/download"
    warn "  Then run this once:"
    warn "    claude mcp add --scope user --transport http ${MCP_ALIAS} ${MCP_URL}"
    return 0
  fi

  # Idempotence: skip if our alias is already registered with Claude Code.
  if claude mcp list </dev/null 2>/dev/null | grep -q "^${MCP_ALIAS}:"; then
    say "${GREEN}✓ LGM MCP already configured — skipping.${RESET}"
    LGM_MCP_CONFIGURED=1
    return 0
  fi

  # --scope user writes to ~/.claude.json (global) instead of the default
  # local scope (.mcp.json in the current dir) — so the MCP is available in
  # every project, regardless of where the installer was run from.
  if run_quiet claude mcp add --scope user --transport http "$MCP_ALIAS" "$MCP_URL"; then
    say "${GREEN}✓ LGM MCP registered with Claude Code (${MCP_ALIAS}, user scope).${RESET}"
    say "${GREY}  On first use, a browser tab opens to sign in to La Growth Machine.${RESET}"
    say "${GREY}  New here? You can create a free account from that tab.${RESET}"
    say "${GREY}  Verify with: claude mcp list${RESET}"
    LGM_MCP_CONFIGURED=1
  else
    warn "  claude mcp add failed. Run manually:"
    warn "    claude mcp add --scope user --transport http ${MCP_ALIAS} ${MCP_URL}"
  fi
}

# ─────────────────────────────────────────────────────────────────────
# Step 4 — print first-step prompts + soft "star the repo" nudge
# ─────────────────────────────────────────────────────────────────────
print_first_steps() {
  [ "${LGM_INSTALL_NO_LAUNCH:-0}" = "1" ] && return 0

  if ! command -v claude >/dev/null 2>&1; then
    say ""
    say "${YELLOW}Claude Code not found.${RESET}"
    say "  Install: ${CYAN}https://claude.ai/download${RESET}"
    say "  Then open Claude Code and try the prompts below."
  fi

  say ""
  say "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${RESET}"
  if [ "$LGM_MCP_CONFIGURED" = "1" ]; then
    say "${GREEN}  LGM GTM Skills + MCP ready.${RESET}"
  else
    say "${GREEN}  LGM GTM Skills installed.${RESET}"
    say "${GREY}  MCP setup skipped — add it anytime:${RESET}"
    say "${GREY}    claude mcp add --scope user --transport http ${MCP_ALIAS} ${MCP_URL}${RESET}"
    say ""
    say "${CYAN}  In the meantime, the skills are ready to use.${RESET}"
    say "${GREY}    They work standalone — paste your data (deal export, campaign sequence,${RESET}"
    say "${GREY}    ICP brief…) and Claude handles the rest. Connecting the MCP later upgrades${RESET}"
    say "${GREY}    every skill to pull and push live data straight from your LGM workspace.${RESET}"
  fi
  say ""
  say "  Start with one of these prompts in Claude Code:"
  say ""
  say "  ${CYAN}Build a prospect list${RESET}"
  say "  ${GREY}→ \"Build me a Sales Navigator URL for SaaS founders in France, 50-500 employees.\"${RESET}"
  say ""
  say "  ${CYAN}Find your proven ICP${RESET}"
  say "  ${GREY}→ \"Audit my biggest closed-won deals and tell me my proven ICP.\"${RESET}"
  say ""
  say "  ${CYAN}Write a campaign${RESET}"
  say "  ${GREY}→ \"Write me a multichannel campaign for Heads of Sales at mid-market B2B SaaS.\"${RESET}"
  say ""
  say "  ${CYAN}Pressure-test a campaign before launch${RESET}"
  say "  ${GREY}→ \"Challenge this campaign before I launch it: [paste your sequence]\"${RESET}"
  say ""
  say "  ${CYAN}See which campaigns drive pipeline${RESET}"
  say "  ${GREY}→ \"Which of my campaigns is actually driving pipeline?\"${RESET}"
  say ""
  say "${GREY}  New to La Growth Machine? Create a free account: ${REGISTER_URL}${RESET}"
  say "${GREY}  If this helped, ${RESET}${CYAN}star the repo${RESET}${GREY}: ${REPO_URL}${RESET}"
  say "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${RESET}"
  say ""
}

# ─────────────────────────────────────────────────────────────────────
# Main
# ─────────────────────────────────────────────────────────────────────
print_logo
ensure_node
install_skills
register_mcp
print_first_steps