#!/bin/bash
# SPDX-License-Identifier: MIT
# SPDX-FileCopyrightText: Netresearch DTT GmbH
# Context7 REST API wrapper
# Based on @upstash/context7-mcp source
# Usage: context7.sh <command> [args...]
# Commands:
#   search <query>                    - Search for library ID
#   docs <library-id> [topic] [mode]  - Fetch documentation

set -e

CONTEXT7_API_KEY="${CONTEXT7_API_KEY:-}"
BASE_URL="https://context7.com/api/v2"

# GET a URL with the source header and, when CONTEXT7_API_KEY is set, the
# API key as a bearer token. The key reaches curl on standard input
# (`-H @-`, curl 7.55 or later), never on its command line, which other
# local users can read from the process list. printf is a shell builtin, so
# the key is in no process's arguments at all.
api_get() {
    local url="$1"
    if [ -n "$CONTEXT7_API_KEY" ]; then
        printf 'Authorization: Bearer %s\n' "$CONTEXT7_API_KEY" |
            curl -s "$url" -H "X-Context7-Source: claude-skill" -H @-
    else
        curl -s "$url" -H "X-Context7-Source: claude-skill"
    fi
}

# Search for library ID
# API: GET /v2/search?query=<query>
search_library() {
    local query="$1"
    if [ -z "$query" ]; then
        echo "Usage: context7.sh search <query>"
        echo "Example: context7.sh search react"
        exit 1
    fi

    local encoded_query
    encoded_query=$(printf '%s' "$query" | jq -sRr @uri)
    local url="${BASE_URL}/search?query=${encoded_query}"

    echo "Searching for: $query"
    echo "---"

    local response
    response=$(api_get "$url")

    # Format results
    echo "$response" | jq -r '
        if .results then
            .results[] | "ID: \(.id)\nName: \(.title // "Unknown")\nSnippets: \(.totalSnippets // "N/A") | Score: \(.benchmarkScore // "N/A")\nDescription: \(.description // "No description")[0:100]\n---"
        elif .error then
            "Error: \(.error)"
        else
            .
        end
    ' 2>/dev/null || echo "$response"
}

# Fetch documentation
# API: GET /v2/docs/<mode>/<username>/<library>[/<tag>]?type=txt&topic=<topic>
fetch_docs() {
    local library_id="$1"
    local topic="$2"
    local mode="${3:-code}"  # Default to 'code' mode

    if [ -z "$library_id" ]; then
        echo "Usage: context7.sh docs <library-id> [topic] [mode]"
        echo ""
        echo "Arguments:"
        echo "  library-id    Format: /org/project or /org/project/version"
        echo "  topic         Optional: Focus area (e.g., 'hooks', 'routing')"
        echo "  mode          Optional: 'code' (default) or 'info'"
        echo ""
        echo "Examples:"
        echo "  context7.sh docs /facebook/react hooks"
        echo "  context7.sh docs /vercel/next.js routing code"
        echo "  context7.sh docs /vercel/next.js \"app router\" info"
        exit 1
    fi

    # Validate mode
    if [ "$mode" != "code" ] && [ "$mode" != "info" ]; then
        echo "Error: mode must be 'code' or 'info'"
        exit 1
    fi

    # Remove leading slash and build URL path
    local cleaned_id="${library_id#/}"
    local url="${BASE_URL}/docs/${mode}/${cleaned_id}?type=txt"

    if [ -n "$topic" ]; then
        local encoded_topic
        encoded_topic=$(printf '%s' "$topic" | jq -sRr @uri)
        url="${url}&topic=${encoded_topic}"
    fi

    echo "Fetching docs: /$cleaned_id"
    echo "Mode: $mode${topic:+ | Topic: $topic}"
    echo "---"

    api_get "$url"
}

# Main command dispatch
case "${1:-}" in
    search)
        shift
        search_library "$@"
        ;;
    docs)
        shift
        fetch_docs "$@"
        ;;
    -h|--help|help)
        echo "Context7 Documentation Lookup"
        echo ""
        echo "Usage: context7.sh <command> [args...]"
        echo ""
        echo "Commands:"
        echo "  search <query>                    Search for library ID"
        echo "  docs <library-id> [topic] [mode]  Fetch documentation"
        echo ""
        echo "Modes:"
        echo "  code    API references and code examples (default)"
        echo "  info    Conceptual guides and tutorials"
        echo ""
        echo "Examples:"
        echo "  context7.sh search react"
        echo "  context7.sh search \"next.js app router\""
        echo "  context7.sh docs /facebook/react hooks"
        echo "  context7.sh docs /vercel/next.js routing"
        echo "  context7.sh docs /prisma/prisma queries info"
        echo ""
        echo "Environment:"
        echo "  CONTEXT7_API_KEY    Optional API key for higher rate limits"
        echo "                      Get one at: https://context7.com/dashboard"
        exit 0
        ;;
    *)
        echo "Context7 Documentation Lookup"
        echo "Usage: context7.sh <command> [args...]"
        echo "Run 'context7.sh --help' for usage information"
        exit 1
        ;;
esac