//! Compiler API endpoints.
//!
//! REST endpoints for smart contract compilation:
//! - WASM compilation and optimization
//! - ABI extraction and encoding
//! - Contract analysis and validation
//! - Security scanning

use axum::{
    extract::State,
    routing::post,
    Json, Router,
};
use serde::{Deserialize, Serialize};

use crate::{
    auth::{require_permission, Authenticated},
    error::ApiResult,
    response::ApiResponse,
    routes::AppState,
};

/// Build compiler routes.
pub fn router() -> Router<AppState> {
    Router::new()
        // Compilation
        .route("/compile", post(compile_contract))
        .route("/compile/dev", post(compile_dev))
        .route("/compile/production", post(compile_production))
        // ABI
        .route("/abi/extract", post(extract_abi))
        .route("/abi/encode", post(encode_call))
        .route("/abi/decode", post(decode_result))
        // Analysis
        .route("/analyze", post(analyze_contract))
        .route("/analyze/security", post(security_scan))
        .route("/analyze/gas", post(estimate_gas))
        // Validation
        .route("/validate", post(validate_contract))
        .route("/validate/exports", post(validate_exports))
        .route("/validate/memory", post(validate_memory))
}

// Types
#[derive(Debug, Deserialize)]
pub struct CompileRequest {
    pub wasm: String, // base64 encoded WASM
    pub optimization_level: Option<String>, // none, basic, size, aggressive
    pub strip_debug: Option<bool>,
    pub strip_names: Option<bool>,
    pub generate_abi: Option<bool>,
}

#[derive(Debug, Serialize)]
pub struct CompileResponse {
    pub contract_id: String,
    pub code_hash: String,
    pub original_size: u64,
    pub optimized_size: u64,
    pub size_reduction: f64,
    pub estimated_deploy_gas: u64,
    pub wasm: String, // base64 encoded optimized WASM
    pub abi: Option<ContractAbi>,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct ContractAbi {
    pub name: String,
    pub version: String,
    pub functions: Vec<AbiFunction>,
    pub events: Vec<AbiEvent>,
    pub errors: Vec<AbiError>,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AbiFunction {
    pub name: String,
    pub selector: String,
    pub inputs: Vec<AbiParam>,
    pub outputs: Vec<AbiParam>,
    pub view: bool,
    pub payable: bool,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AbiParam {
    pub name: String,
    pub param_type: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AbiEvent {
    pub name: String,
    pub topic: String,
    pub params: Vec<AbiParam>,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AbiError {
    pub name: String,
    pub selector: String,
    pub params: Vec<AbiParam>,
}

#[derive(Debug, Deserialize)]
pub struct EncodeCallRequest {
    pub function_name: String,
    pub args: Vec<serde_json::Value>,
    pub abi: Option<ContractAbi>,
}

#[derive(Debug, Serialize)]
pub struct AnalysisResult {
    pub size_breakdown: SizeBreakdown,
    pub functions: Vec<FunctionAnalysis>,
    pub imports: Vec<ImportInfo>,
    pub gas_analysis: GasAnalysis,
}

#[derive(Debug, Serialize)]
pub struct SizeBreakdown {
    pub code: u64,
    pub data: u64,
    pub functions: u64,
    pub memory: u64,
    pub exports: u64,
    pub imports: u64,
    pub total: u64,
}

#[derive(Debug, Serialize)]
pub struct FunctionAnalysis {
    pub name: String,
    pub size: u64,
    pub instruction_count: u32,
    pub local_count: u32,
    pub exported: bool,
    pub estimated_gas: u64,
}

#[derive(Debug, Serialize)]
pub struct ImportInfo {
    pub module: String,
    pub name: String,
    pub kind: String,
}

#[derive(Debug, Serialize)]
pub struct GasAnalysis {
    pub deployment_gas: u64,
    pub memory_init_gas: u64,
    pub data_section_gas: u64,
}

#[derive(Debug, Serialize)]
pub struct SecurityScanResult {
    pub score: u32,
    pub issues: Vec<SecurityIssue>,
    pub recommendations: Vec<String>,
}

#[derive(Debug, Serialize)]
pub struct SecurityIssue {
    pub severity: String,
    pub issue_type: String,
    pub description: String,
    pub location: Option<String>,
}

#[derive(Debug, Serialize)]
pub struct ValidationResult {
    pub valid: bool,
    pub export_count: u32,
    pub import_count: u32,
    pub function_count: u32,
    pub memory_pages: u32,
    pub errors: Vec<ValidationError>,
    pub warnings: Vec<String>,
}

#[derive(Debug, Serialize)]
pub struct ValidationError {
    pub code: String,
    pub message: String,
    pub location: Option<String>,
}

#[derive(Debug, Deserialize)]
pub struct ValidateExportsRequest {
    pub wasm: String,
    pub required_exports: Vec<String>,
}

#[derive(Debug, Deserialize)]
pub struct ValidateMemoryRequest {
    pub wasm: String,
    pub max_pages: u32,
}

// Handlers
async fn compile_contract(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<CompileRequest>,
) -> ApiResult<Json<ApiResponse<CompileResponse>>> {
    require_permission(&auth, "write")?;

    let response = CompileResponse {
        contract_id: "contract_abc123".to_string(),
        code_hash: "0xhash...".to_string(),
        original_size: 10000,
        optimized_size: 5000,
        size_reduction: 50.0,
        estimated_deploy_gas: 100000,
        wasm: "optimized_wasm_base64...".to_string(),
        abi: Some(ContractAbi {
            name: "MyContract".to_string(),
            version: "1.0.0".to_string(),
            functions: vec![
                AbiFunction {
                    name: "init".to_string(),
                    selector: "0x12345678".to_string(),
                    inputs: vec![],
                    outputs: vec![],
                    view: false,
                    payable: false,
                },
            ],
            events: vec![],
            errors: vec![],
        }),
    };

    Ok(Json(ApiResponse::success(response)))
}

async fn compile_dev(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<CompileRequest>,
) -> ApiResult<Json<ApiResponse<CompileResponse>>> {
    require_permission(&auth, "write")?;

    // Development mode: fast, no optimization
    let response = CompileResponse {
        contract_id: "contract_dev".to_string(),
        code_hash: "0xhash...".to_string(),
        original_size: 10000,
        optimized_size: 10000,
        size_reduction: 0.0,
        estimated_deploy_gas: 200000,
        wasm: "dev_wasm_base64...".to_string(),
        abi: None,
    };

    Ok(Json(ApiResponse::success(response)))
}

async fn compile_production(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<CompileRequest>,
) -> ApiResult<Json<ApiResponse<CompileResponse>>> {
    require_permission(&auth, "write")?;

    // Production mode: aggressive optimization
    let response = CompileResponse {
        contract_id: "contract_prod".to_string(),
        code_hash: "0xhash...".to_string(),
        original_size: 10000,
        optimized_size: 3000,
        size_reduction: 70.0,
        estimated_deploy_gas: 60000,
        wasm: "prod_wasm_base64...".to_string(),
        abi: None,
    };

    Ok(Json(ApiResponse::success(response)))
}

async fn extract_abi(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<ContractAbi>>> {
    require_permission(&auth, "read")?;

    let abi = ContractAbi {
        name: "MyContract".to_string(),
        version: "1.0.0".to_string(),
        functions: vec![],
        events: vec![],
        errors: vec![],
    };

    Ok(Json(ApiResponse::success(abi)))
}

async fn encode_call(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<EncodeCallRequest>,
) -> ApiResult<Json<ApiResponse<serde_json::Value>>> {
    require_permission(&auth, "read")?;

    let result = serde_json::json!({
        "encoded": "0x12345678abcdef...",
        "selector": "0x12345678"
    });

    Ok(Json(ApiResponse::success(result)))
}

async fn decode_result(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<serde_json::Value>>> {
    require_permission(&auth, "read")?;

    let result = serde_json::json!({
        "decoded": ["value1", 42, true]
    });

    Ok(Json(ApiResponse::success(result)))
}

async fn analyze_contract(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<AnalysisResult>>> {
    require_permission(&auth, "read")?;

    let result = AnalysisResult {
        size_breakdown: SizeBreakdown {
            code: 3000,
            data: 500,
            functions: 2500,
            memory: 100,
            exports: 50,
            imports: 100,
            total: 5000,
        },
        functions: vec![
            FunctionAnalysis {
                name: "init".to_string(),
                size: 500,
                instruction_count: 50,
                local_count: 3,
                exported: true,
                estimated_gas: 10000,
            },
        ],
        imports: vec![
            ImportInfo {
                module: "env".to_string(),
                name: "memory".to_string(),
                kind: "memory".to_string(),
            },
        ],
        gas_analysis: GasAnalysis {
            deployment_gas: 100000,
            memory_init_gas: 5000,
            data_section_gas: 2000,
        },
    };

    Ok(Json(ApiResponse::success(result)))
}

async fn security_scan(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<SecurityScanResult>>> {
    require_permission(&auth, "read")?;

    let result = SecurityScanResult {
        score: 85,
        issues: vec![
            SecurityIssue {
                severity: "low".to_string(),
                issue_type: "unbounded_loop".to_string(),
                description: "Potential unbounded loop detected".to_string(),
                location: Some("function:process".to_string()),
            },
        ],
        recommendations: vec![
            "Add loop iteration limits".to_string(),
            "Consider using checked arithmetic".to_string(),
        ],
    };

    Ok(Json(ApiResponse::success(result)))
}

async fn estimate_gas(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<serde_json::Value>>> {
    require_permission(&auth, "read")?;

    let result = serde_json::json!({
        "deployment_gas": 100000,
        "per_function": {
            "init": 10000,
            "execute": 5000,
            "query": 2000
        }
    });

    Ok(Json(ApiResponse::success(result)))
}

async fn validate_contract(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<serde_json::Value>,
) -> ApiResult<Json<ApiResponse<ValidationResult>>> {
    require_permission(&auth, "read")?;

    let result = ValidationResult {
        valid: true,
        export_count: 5,
        import_count: 3,
        function_count: 10,
        memory_pages: 1,
        errors: vec![],
        warnings: vec!["Consider adding explicit error handling".to_string()],
    };

    Ok(Json(ApiResponse::success(result)))
}

async fn validate_exports(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<ValidateExportsRequest>,
) -> ApiResult<Json<ApiResponse<serde_json::Value>>> {
    require_permission(&auth, "read")?;

    let result = serde_json::json!({
        "valid": true,
        "missing_exports": [],
        "extra_exports": ["helper"]
    });

    Ok(Json(ApiResponse::success(result)))
}

async fn validate_memory(
    State(state): State<AppState>,
    Authenticated(auth): Authenticated,
    Json(req): Json<ValidateMemoryRequest>,
) -> ApiResult<Json<ApiResponse<serde_json::Value>>> {
    require_permission(&auth, "read")?;

    let result = serde_json::json!({
        "valid": true,
        "current_pages": 1,
        "max_pages": req.max_pages,
        "within_limit": true
    });

    Ok(Json(ApiResponse::success(result)))
}
