#!/usr/bin/env nu
# MCP Integration Manager for AuroraFrame
#
# Manages the connection between AuroraFrame and the Nushell MCP server
# Provides seamless AI integration for content generation, schema intelligence,
# error resolution, and asset optimization

# MCP Server Configuration
let MCP_CONFIG = {
    server_path: "./auroraframe-mcp-server/mcp-server.nu"
    connection_timeout: 30000  # 30 seconds
    max_retries: 3
    log_level: "info"
}

# Check if MCP server is available and functional
export def check_mcp_availability [] {
    let server_exists = ($MCP_CONFIG.server_path | path exists)

    if not $server_exists {
        return {
            available: false
            reason: "MCP server not found"
            path: $MCP_CONFIG.server_path
        }
    }

    # Test basic MCP server functionality
    let test_result = try {
        nu $MCP_CONFIG.server_path --help | complete
    } catch {
        return {
            available: false
            reason: "MCP server failed to start"
            error: $env.LAST_EXIT_CODE
        }
    }

    if $test_result.exit_code != 0 {
        return {
            available: false
            reason: "MCP server startup error"
            stderr: $test_result.stderr
        }
    }

    {
        available: true
        version: "1.0.0"
        server_path: $MCP_CONFIG.server_path
    }
}

# Initialize MCP server connection
export def init_mcp_connection [verbose: bool = false] {
    if $verbose { print "🔌 Initializing MCP server connection..." }

    let availability = (check_mcp_availability)

    if not $availability.available {
        if $verbose {
            print $"❌ MCP server unavailable: ($availability.reason)"
            if "path" in $availability {
                print $"   Server path: ($availability.path)"
            }
        }
        return { connected: false, reason: $availability.reason }
    }

    if $verbose {
        print $"✅ MCP server available at: ($availability.server_path)"
        print $"📡 Connection established (version: ($availability.version))"
    }

    {
        connected: true
        server: $availability
        config: $MCP_CONFIG
    }
}

# Execute MCP tool with error handling and retries
export def execute_mcp_tool [
    tool_name: string
    arguments: record
    --timeout: int = 30000
    --retries: int = 3
    --verbose: bool = false
] {
    if $verbose { print $"🔧 Executing MCP tool: ($tool_name)" }

    let connection = (init_mcp_connection $verbose)

    if not $connection.connected {
        return {
            success: false
            error: $"MCP connection failed: ($connection.reason)"
        }
    }

    # Prepare MCP request
    let mcp_request = {
        jsonrpc: "2.0"
        id: (random uuid)
        method: "tools/call"
        params: {
            name: $tool_name
            arguments: $arguments
        }
    }

    mut attempts = 0
    mut last_error = ""

    # Retry loop
    while $attempts < $retries {
        $attempts = ($attempts + 1)

        if $verbose and $attempts > 1 {
            print $"🔄 Retry attempt ($attempts)/($retries)"
        }

        let result = try {
            # In a real implementation, this would communicate with the MCP server
            # For now, we'll simulate the response
            execute_mcp_request $mcp_request $connection.server.server_path $verbose
        } catch { |error|
            $last_error = $error.msg
            if $verbose { print $"❌ MCP execution failed (attempt ($attempts)): ($error.msg)" }
            continue
        }

        if "error" not-in $result {
            if $verbose { print $"✅ MCP tool executed successfully" }
            return {
                success: true
                result: $result
                attempts: $attempts
            }
        } else {
            $last_error = $result.error
            if $verbose { print $"❌ MCP tool error (attempt ($attempts)): ($result.error)" }
        }
    }

    # All attempts failed
    {
        success: false
        error: $"MCP execution failed after ($retries) attempts: ($last_error)"
        attempts: $attempts
    }
}

# Execute MCP request (simulated for now)
def execute_mcp_request [request: record, server_path: string, verbose: bool] {
    # This is a mock implementation
    # In production, this would:
    # 1. Start the MCP server process
    # 2. Send JSON-RPC request via stdin
    # 3. Read JSON-RPC response from stdout
    # 4. Handle errors and timeouts

    let tool_name = $request.params.name
    let args = $request.params.arguments

    # Mock responses for demonstration
    match $tool_name {
        "generate_content" => {
            let prompt = $args.prompt
            let format = ($args.format | default "markdown")

            {
                jsonrpc: "2.0"
                id: $request.id
                result: {
                    content: [{
                        type: "text"
                        text: $"# AI-Generated Content\n\nGenerated content for prompt: \"($prompt)\"\n\nFormat: ($format)\n\nThis would be actual AI-generated content in production."
                    }]
                }
            }
        }

        "enhance_content" => {
            let enhancements = ($args.enhancements | str join ", ")

            {
                jsonrpc: "2.0"
                id: $request.id
                result: {
                    content: [{
                        type: "text"
                        text: $"Enhanced content with improvements: ($enhancements)\n\nOriginal content has been optimized for better performance and user experience."
                    }]
                }
            }
        }

        "generate_schema" => {
            let description = $args.description

            {
                jsonrpc: "2.0"
                id: $request.id
                result: {
                    content: [{
                        type: "text"
                        text: $"Generated KCL Schema based on: \"($description)\"\n\n```kcl\nschema GeneratedContent:\n    title: str\n    description: str\n    created_at: str\n    tags: [str] = []\n    featured: bool = false\n```"
                    }]
                }
            }
        }

        "resolve_error" => {
            let error_msg = $args.error.message

            {
                jsonrpc: "2.0"
                id: $request.id
                result: {
                    content: [{
                        type: "text"
                        text: $"Error Analysis for: \"($error_msg)\"\n\n## Suggested Fixes:\n1. Check configuration syntax\n2. Validate required fields\n3. Ensure proper file permissions\n\n## Prevention:\n- Use KCL schema validation\n- Enable strict type checking"
                    }]
                }
            }
        }

        _ => {
            {
                jsonrpc: "2.0"
                id: $request.id
                error: {
                    code: -32601
                    message: $"Method not found: ($tool_name)"
                }
            }
        }
    }
}

# MCP-powered content generation
export def mcp_generate_content [
    prompt: string
    schema: record = {}
    format: string = "markdown"
    --verbose: bool = false
] {
    let result = (execute_mcp_tool "generate_content" {
        prompt: $prompt
        schema: $schema
        format: $format
    } --verbose=$verbose)

    if $result.success {
        $result.result.result.content.0.text
    } else {
        throw $result.error
    }
}

# MCP-powered content enhancement
export def mcp_enhance_content [
    content: string
    enhancements: list = ["seo"]
    --verbose: bool = false
] {
    let result = (execute_mcp_tool "enhance_content" {
        content: $content
        enhancements: $enhancements
    } --verbose=$verbose)

    if $result.success {
        $result.result.result.content.0.text
    } else {
        throw $result.error
    }
}

# MCP-powered schema generation
export def mcp_generate_schema [
    description: string
    examples: list = []
    --verbose: bool = false
] {
    let result = (execute_mcp_tool "generate_schema" {
        description: $description
        examples: $examples
    } --verbose=$verbose)

    if $result.success {
        $result.result.result.content.0.text
    } else {
        throw $result.error
    }
}

# MCP-powered error resolution
export def mcp_resolve_error [
    error_info: record
    project_context: record = {}
    --verbose: bool = false
] {
    let result = (execute_mcp_tool "resolve_error" {
        error: $error_info
        project_context: $project_context
    } --verbose=$verbose)

    if $result.success {
        $result.result.result.content.0.text
    } else {
        throw $result.error
    }
}

# Integration with existing framework commands
export def integrate_mcp_with_framework [] {
    # Add MCP status to framework info
    let mcp_status = (check_mcp_availability)

    print "🤖 MCP Integration Status:"
    if $mcp_status.available {
        print $"   ✅ Available (version: ($mcp_status.version))"
        print $"   📍 Server: ($mcp_status.server_path)"
    } else {
        print $"   ❌ Unavailable: ($mcp_status.reason)"
    }
}

# MCP health check and diagnostics
export def mcp_diagnostics [--verbose: bool = false] {
    print "🏥 MCP Server Diagnostics"
    print "========================="

    # Check server file
    let server_exists = ($MCP_CONFIG.server_path | path exists)
    print $"Server file: (if $server_exists { '✅' } else { '❌' }) ($MCP_CONFIG.server_path)"

    if not $server_exists {
        print "❌ MCP server not found. Please ensure the server is installed."
        return
    }

    # Check dependencies
    print "\n📦 Dependencies:"

    # Check Nushell version
    let nu_version = (version | get version)
    print $"   Nushell: ✅ ($nu_version)"

    # Check OpenAI API key (if configured)
    let openai_key = ($env.OPENAI_API_KEY? | default "")
    if ($openai_key | is-empty) {
        print "   OpenAI API: ⚠️  Not configured (optional)"
    } else {
        print "   OpenAI API: ✅ Configured"
    }

    # Test basic functionality
    print "\n🧪 Functionality Tests:"

    let connection_test = try {
        init_mcp_connection false
    } catch {
        { connected: false, reason: "Connection test failed" }
    }

    if $connection_test.connected {
        print "   Connection: ✅ Success"

        # Test a simple MCP call
        let tool_test = try {
            execute_mcp_tool "generate_schema" { description: "test schema" } --verbose=false
        } catch {
            { success: false, error: "Tool test failed" }
        }

        if $tool_test.success {
            print "   Tool Execution: ✅ Success"
        } else {
            print $"   Tool Execution: ❌ ($tool_test.error)"
        }
    } else {
        print $"   Connection: ❌ ($connection_test.reason)"
    }

    print "\n📊 Configuration:"
    print $"   Timeout: ($MCP_CONFIG.connection_timeout)ms"
    print $"   Max Retries: ($MCP_CONFIG.max_retries)"
    print $"   Log Level: ($MCP_CONFIG.log_level)"

    if $verbose {
        print "\n🔍 Detailed Configuration:"
        $MCP_CONFIG | table
    }
}