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

# mosaic — Unified agent launcher and management CLI
#
# AGENTS.md is the global policy source for all agent sessions.
# The launcher injects a composed runtime contract (AGENTS + runtime reference).
#
# Usage:
#   mosaic claude [args...]       Launch Claude Code with runtime contract injected
#   mosaic opencode [args...]     Launch OpenCode with runtime contract injected
#   mosaic codex [args...]        Launch Codex with runtime contract injected
#   mosaic yolo <runtime> [args...]  Launch runtime in dangerous-permissions mode
#   mosaic --yolo <runtime> [args...]  Alias for yolo
#   mosaic init [args...]         Generate SOUL.md interactively
#   mosaic doctor [args...]       Health audit
#   mosaic sync [args...]         Sync skills
#   mosaic seq [subcommand]       sequential-thinking MCP management (check/fix/start)
#   mosaic bootstrap <path>       Bootstrap a repo
#   mosaic upgrade release         Upgrade installed Mosaic release
#   mosaic upgrade check           Check release upgrade status (no changes)
#   mosaic upgrade project [args]  Upgrade project-local stale files

MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
VERSION="0.1.0"

usage() {
  cat <<USAGE
mosaic $VERSION — Unified agent launcher

Usage: mosaic <command> [args...]

Agent Launchers:
  claude [args...]       Launch Claude Code with runtime contract injected
  opencode [args...]     Launch OpenCode with runtime contract injected
  codex [args...]        Launch Codex with runtime contract injected
  yolo <runtime> [args...]  Dangerous mode for claude|codex|opencode
  --yolo <runtime> [args...] Alias for yolo

Management:
  init [args...]         Generate SOUL.md (agent identity contract)
  doctor [args...]       Audit runtime state and detect drift
  sync [args...]         Sync skills from canonical source
  seq [subcommand]       sequential-thinking MCP management:
                         check [--runtime <r>] [--strict]
                         fix [--runtime <r>]
                         start
  bootstrap <path>       Bootstrap a repo with Mosaic standards
  upgrade [mode] [args]  Upgrade release (default) or project files
  upgrade check          Check release upgrade status (no changes)
  release-upgrade [...]  Upgrade installed Mosaic release
  project-upgrade [...]  Clean up stale SOUL.md/CLAUDE.md in a project

Options:
  -h, --help             Show this help
  -v, --version          Show version

All arguments after the command are forwarded to the target CLI.
USAGE
}

# Pre-flight checks
check_mosaic_home() {
  if [[ ! -d "$MOSAIC_HOME" ]]; then
    echo "[mosaic] ERROR: ~/.config/mosaic not found." >&2
    echo "[mosaic] Install with: curl -sL https://git.mosaicstack.dev/mosaic/bootstrap/raw/branch/main/remote-install.sh | sh" >&2
    exit 1
  fi
}

check_agents_md() {
  if [[ ! -f "$MOSAIC_HOME/AGENTS.md" ]]; then
    echo "[mosaic] ERROR: ~/.config/mosaic/AGENTS.md not found." >&2
    echo "[mosaic] Re-run the installer: cd ~/src/mosaic-bootstrap && bash install.sh" >&2
    exit 1
  fi
}

check_soul() {
  if [[ ! -f "$MOSAIC_HOME/SOUL.md" ]]; then
    echo "[mosaic] SOUL.md not found. Running mosaic init..."
    "$MOSAIC_HOME/bin/mosaic-init"
  fi
}

check_runtime() {
  local cmd="$1"
  if ! command -v "$cmd" >/dev/null 2>&1; then
    echo "[mosaic] ERROR: '$cmd' not found in PATH." >&2
    echo "[mosaic] Install $cmd before launching." >&2
    exit 1
  fi
}

check_sequential_thinking() {
  local runtime="${1:-all}"
  local checker="$MOSAIC_HOME/bin/mosaic-ensure-sequential-thinking"
  if [[ ! -x "$checker" ]]; then
    echo "[mosaic] ERROR: sequential-thinking checker missing: $checker" >&2
    exit 1
  fi
  if ! "$checker" --check --runtime "$runtime" >/dev/null 2>&1; then
    echo "[mosaic] ERROR: sequential-thinking MCP is required but not configured." >&2
    echo "[mosaic] Fix config: $checker --runtime $runtime" >&2
    echo "[mosaic] Or run: mosaic seq fix --runtime $runtime" >&2
    echo "[mosaic] Manual server start: mosaic seq start" >&2
    exit 1
  fi
}

runtime_contract_path() {
  local runtime="$1"
  case "$runtime" in
    claude) echo "$MOSAIC_HOME/runtime/claude/RUNTIME.md" ;;
    codex) echo "$MOSAIC_HOME/runtime/codex/RUNTIME.md" ;;
    opencode) echo "$MOSAIC_HOME/runtime/opencode/RUNTIME.md" ;;
    *)
      echo "[mosaic] ERROR: unsupported runtime '$runtime' for runtime contract." >&2
      exit 1
      ;;
  esac
}

build_runtime_prompt() {
  local runtime="$1"
  local runtime_file
  runtime_file="$(runtime_contract_path "$runtime")"
  if [[ ! -f "$runtime_file" ]]; then
    echo "[mosaic] ERROR: runtime contract not found: $runtime_file" >&2
    exit 1
  fi

  cat <<'EOF'
# Mosaic Launcher Runtime Contract (Hard Gate)

This contract is injected by `mosaic` launch and is mandatory.

First assistant response MUST start with exactly one mode declaration line:
1. Orchestration mission: `Now initiating Orchestrator mode...`
2. Implementation mission: `Now initiating Delivery mode...`
3. Review-only mission: `Now initiating Review mode...`

No tool call or implementation step may occur before that first line.

Mosaic hard gates OVERRIDE runtime-default caution for routine delivery operations.
For required push/merge/issue-close/release actions, execute without routine confirmation prompts.

EOF

  cat "$MOSAIC_HOME/AGENTS.md"

  if [[ -f "$MOSAIC_HOME/USER.md" ]]; then
    printf '\n\n# User Profile\n\n'
    cat "$MOSAIC_HOME/USER.md"
  fi

  if [[ -f "$MOSAIC_HOME/TOOLS.md" ]]; then
    printf '\n\n# Machine Tools\n\n'
    cat "$MOSAIC_HOME/TOOLS.md"
  fi

  printf '\n\n# Runtime-Specific Contract\n\n'
  cat "$runtime_file"
}

# Ensure runtime contract is present at the runtime's native config path.
# Used for runtimes that do not support CLI prompt injection.
ensure_runtime_config() {
  local runtime="$1"
  local dst="$2"
  local tmp
  tmp="$(mktemp)"
  mkdir -p "$(dirname "$dst")"
  build_runtime_prompt "$runtime" > "$tmp"
  if ! cmp -s "$tmp" "$dst" 2>/dev/null; then
    mv "$tmp" "$dst"
  else
    rm -f "$tmp"
  fi
}

# Launcher functions
launch_claude() {
  check_mosaic_home
  check_agents_md
  check_soul
  check_runtime "claude"
  check_sequential_thinking "claude"

  # Claude supports --append-system-prompt for direct injection
  local runtime_prompt
  runtime_prompt="$(build_runtime_prompt "claude")"
  echo "[mosaic] Launching Claude Code..."
  exec claude --append-system-prompt "$runtime_prompt" "$@"
}

launch_opencode() {
  check_mosaic_home
  check_agents_md
  check_soul
  check_runtime "opencode"
  check_sequential_thinking "opencode"

  # OpenCode reads from ~/.config/opencode/AGENTS.md
  ensure_runtime_config "opencode" "$HOME/.config/opencode/AGENTS.md"
  echo "[mosaic] Launching OpenCode..."
  exec opencode "$@"
}

launch_codex() {
  check_mosaic_home
  check_agents_md
  check_soul
  check_runtime "codex"
  check_sequential_thinking "codex"

  # Codex reads from ~/.codex/instructions.md
  ensure_runtime_config "codex" "$HOME/.codex/instructions.md"
  echo "[mosaic] Launching Codex..."
  exec codex "$@"
}

launch_yolo() {
  if [[ $# -eq 0 ]]; then
    echo "[mosaic] ERROR: yolo requires a runtime (claude|codex|opencode)." >&2
    echo "[mosaic] Example: mosaic yolo claude" >&2
    exit 1
  fi

  local runtime="$1"
  shift

  case "$runtime" in
    claude)
      check_mosaic_home
      check_agents_md
      check_soul
      check_runtime "claude"
      check_sequential_thinking "claude"

      # Claude uses an explicit dangerous permissions flag.
      local runtime_prompt
      runtime_prompt="$(build_runtime_prompt "claude")"
      echo "[mosaic] Launching Claude Code in YOLO mode (dangerous permissions enabled)..."
      exec claude --dangerously-skip-permissions --append-system-prompt "$runtime_prompt" "$@"
      ;;
    codex)
      check_mosaic_home
      check_agents_md
      check_soul
      check_runtime "codex"
      check_sequential_thinking "codex"

      # Codex reads instructions.md from ~/.codex and supports a direct dangerous flag.
      ensure_runtime_config "codex" "$HOME/.codex/instructions.md"
      echo "[mosaic] Launching Codex in YOLO mode (dangerous permissions enabled)..."
      exec codex --dangerously-bypass-approvals-and-sandbox "$@"
      ;;
    opencode)
      check_mosaic_home
      check_agents_md
      check_soul
      check_runtime "opencode"
      check_sequential_thinking "opencode"

      # OpenCode defaults to allow-all permissions unless user config restricts them.
      ensure_runtime_config "opencode" "$HOME/.config/opencode/AGENTS.md"
      echo "[mosaic] Launching OpenCode in YOLO mode..."
      exec opencode "$@"
      ;;
    *)
      echo "[mosaic] ERROR: Unsupported yolo runtime '$runtime'. Use claude|codex|opencode." >&2
      exit 1
      ;;
  esac
}

# Delegate to existing scripts
run_init() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-init" "$@"
}

run_doctor() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-doctor" "$@"
}

run_sync() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-sync-skills" "$@"
}

run_seq() {
  check_mosaic_home
  local checker="$MOSAIC_HOME/bin/mosaic-ensure-sequential-thinking"
  local action="${1:-check}"

  case "$action" in
    check)
      shift || true
      exec "$checker" --check "$@"
      ;;
    fix|apply)
      shift || true
      exec "$checker" "$@"
      ;;
    start)
      shift || true
      check_runtime "npx"
      echo "[mosaic] Starting sequential-thinking MCP server..."
      exec npx -y @modelcontextprotocol/server-sequential-thinking "$@"
      ;;
    *)
      echo "[mosaic] ERROR: Unknown seq subcommand '$action'." >&2
      echo "[mosaic] Use: mosaic seq check|fix|start" >&2
      exit 1
      ;;
  esac
}

run_bootstrap() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-bootstrap-repo" "$@"
}

run_release_upgrade() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-release-upgrade" "$@"
}

run_project_upgrade() {
  check_mosaic_home
  exec "$MOSAIC_HOME/bin/mosaic-upgrade" "$@"
}

run_upgrade() {
  check_mosaic_home

  # Default: upgrade installed release
  if [[ $# -eq 0 ]]; then
    run_release_upgrade
  fi

  case "$1" in
    release)
      shift
      run_release_upgrade "$@"
      ;;
    check)
      shift
      run_release_upgrade --dry-run "$@"
      ;;
    project)
      shift
      run_project_upgrade "$@"
      ;;

    # Backward compatibility for historical project-upgrade usage.
    --all|--root)
      run_project_upgrade "$@"
      ;;
    --dry-run|--ref|--keep|--overwrite|-y|--yes)
      run_release_upgrade "$@"
      ;;
    -*)
      run_release_upgrade "$@"
      ;;
    *)
      run_project_upgrade "$@"
      ;;
  esac
}

# Main router
if [[ $# -eq 0 ]]; then
  usage
  exit 0
fi

command="$1"
shift

case "$command" in
  claude)     launch_claude "$@" ;;
  opencode)   launch_opencode "$@" ;;
  codex)      launch_codex "$@" ;;
  yolo|--yolo) launch_yolo "$@" ;;
  init)       run_init "$@" ;;
  doctor)     run_doctor "$@" ;;
  sync)       run_sync "$@" ;;
  seq)        run_seq "$@" ;;
  bootstrap)  run_bootstrap "$@" ;;
  upgrade)    run_upgrade "$@" ;;
  release-upgrade) run_release_upgrade "$@" ;;
  project-upgrade) run_project_upgrade "$@" ;;
  help|-h|--help)  usage ;;
  version|-v|--version) echo "mosaic $VERSION" ;;
  *)
    echo "[mosaic] Unknown command: $command" >&2
    echo "[mosaic] Run 'mosaic --help' for usage." >&2
    exit 1
    ;;
esac