#!/bin/sh
# Install ctask to ~/.local/bin on Linux (or pass an alternative directory as $1).
# Builds ctask from the local repo, copies the binary and bash status-line helper
# to the install directory, and warns if the directory is not on $PATH.
# Does not modify workspace data. Does not modify shell config.

set -eu

INSTALL_DIR="${1:-$HOME/.local/bin}"

# Find repo root (script lives in scripts/)
SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
REPO_ROOT=$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd)

if [ ! -f "$REPO_ROOT/go.mod" ]; then
    printf 'Error: cannot find go.mod at %s. Run this script from the ctask repo.\n' "$REPO_ROOT" >&2
    exit 1
fi

printf 'ctask install\n'
printf '  Source:  %s\n' "$REPO_ROOT"
printf '  Target:  %s\n' "$INSTALL_DIR"
printf '\n'

# Step 1: find go
if ! command -v go >/dev/null 2>&1; then
    printf 'Error: Go not found on PATH. Install Go 1.26+ and ensure it is on PATH.\n' >&2
    exit 1
fi

# Step 2: build (host platform; on WSL/Linux this produces a Linux binary named "ctask")
printf 'Building ctask... '
if ! ( cd "$REPO_ROOT" && go build -o ctask ./ ); then
    printf 'FAILED\n'
    exit 1
fi
printf 'OK\n'

# Step 3: ensure install dir exists
if [ ! -d "$INSTALL_DIR" ]; then
    mkdir -p "$INSTALL_DIR"
    printf '  Created %s\n' "$INSTALL_DIR"
fi

# Step 4: copy binary and statusline helper
install_file() {
    src=$1
    dst=$2
    if [ -f "$src" ]; then
        cp -f "$src" "$dst"
        chmod 0755 "$dst"
        printf '  Installed %s\n' "$(basename "$dst")"
    else
        printf '  Warning: source not found: %s\n' "$src" >&2
    fi
}

install_file "$REPO_ROOT/ctask" "$INSTALL_DIR/ctask"
install_file "$REPO_ROOT/scripts/ctask-statusline.sh" "$INSTALL_DIR/ctask-statusline.sh"

# Step 5: PATH check (do not modify shell config; warn with the right snippet)
case ":${PATH:-}:" in
    *":$INSTALL_DIR:"*)
        printf '\n  PATH: already contains %s\n' "$INSTALL_DIR"
        ;;
    *)
        printf '\n  PATH: %s is not on $PATH\n' "$INSTALL_DIR"
        shell_name=$(basename "${SHELL:-/bin/sh}")
        case "$shell_name" in
            zsh)
                printf '  Add this to ~/.zshrc:\n    export PATH="%s:$PATH"\n' "$INSTALL_DIR"
                ;;
            bash)
                printf '  Add this to ~/.bashrc (or ~/.bash_profile on macOS):\n    export PATH="%s:$PATH"\n' "$INSTALL_DIR"
                ;;
            *)
                printf '  Add the following to your shell config:\n    export PATH="%s:$PATH"\n' "$INSTALL_DIR"
                ;;
        esac
        ;;
esac

# Step 6: verify
if [ -x "$INSTALL_DIR/ctask" ]; then
    ver=$("$INSTALL_DIR/ctask" --version 2>/dev/null || echo unknown)
    printf '\nInstalled: %s\n' "$ver"
else
    printf 'Warning: binary not found at %s/ctask\n' "$INSTALL_DIR" >&2
    exit 1
fi

# Step 7: clean up build artifact in repo root
rm -f "$REPO_ROOT/ctask"

printf "\nRun 'ctask doctor' in a new terminal to verify setup.\n"