// cli.bux — CLI driver for the Bux self-hosting compiler
// Wires together: Lexer → Parser → Sema → HirLower → CBackend
module Cli {

extern func PrintLine(s: String);
extern func Print(s: String);
extern func ReadFile(path: String) -> String;
extern func WriteFile(path: String, content: String) -> bool;

// Import the compiler pipeline
// In self-hosting mode, these are compiled together from src_bux/

// ---------------------------------------------------------------------------
// Compile a single .bux source file
// ---------------------------------------------------------------------------

func Cli_Compile(source: String, sourceName: String) -> String {
    // Phase 1: Lex
    let lex: *Lexer = Lexer_Tokenize(source);
    if Lexer_DiagCount(lex) > 0 {
        PrintLine("Lex errors:");
        var i: int = 0;
        while i < Lexer_DiagCount(lex) {
            Print("  ");
            PrintLine(lex.diags[i].message);
            i = i + 1;
        }
        return "";
    }

    // Phase 2: Parse
    let mod: *Module = Parser_Parse(lex.tokens, lex.tokenCount);
    if mod == null as *Module {
        PrintLine("Parse failed");
        return "";
    }

    // Phase 3: Semantic analysis
    let sema: *Sema = Sema_Analyze(mod);
    if Sema_HasError(sema) {
        PrintLine("Sema errors:");
        var i: int = 0;
        while i < Sema_DiagCount(sema) {
            Print("  ");
            PrintLine(sema.diags[i].message);
            i = i + 1;
        }
        return "";
    }

    // Phase 4: HIR lowering
    let hirMod: *HirModule = HirLower_LowerModule(mod, sema);
    if hirMod == null as *HirModule {
        PrintLine("HIR lowering failed");
        return "";
    }

    // Phase 5: C code generation
    let cCode: String = CBackend_Generate(hirMod);

    // Cleanup
    Lexer_Free(lex);
    Sema_Free(sema);

    return cCode;
}

// ---------------------------------------------------------------------------
// Build command
// ---------------------------------------------------------------------------

func Cli_Build(srcPath: String, outPath: String) -> int {
    let source: String = ReadFile(srcPath);
    if String_Eq(source, "") || !FileExists(srcPath) {
        Print("Error: cannot read source file: ");
        PrintLine(srcPath);
        return 1;
    }

    Print("Compiling ");
    PrintLine(srcPath);

    let cCode: String = Cli_Compile(source, srcPath);

    if String_Eq(cCode, "") {
        PrintLine("Compilation failed");
        return 1;
    }

    // Write C output
    let ok: bool = WriteFile(outPath, cCode);
    if ok {
        Print("  → C code written to ");
        PrintLine(outPath);
        return 0;
    } else {
        PrintLine("Error: cannot write output file");
        return 1;
    }
}

// ---------------------------------------------------------------------------
// Check command (compile only, no output)
// ---------------------------------------------------------------------------

func Cli_Check(srcPath: String) -> int {
    let source: String = ReadFile(srcPath);
    if String_Eq(source, "") {
        PrintLine("Error: cannot read source file");
        return 1;
    }

    let cCode: String = Cli_Compile(source, srcPath);
    if String_Eq(cCode, "") {
        return 1;
    }

    PrintLine("Check passed");
    return 0;
}

// ---------------------------------------------------------------------------
// Main entry — dispatch based on args
// ---------------------------------------------------------------------------

func Cli_Run(args: *String, argCount: int) -> int {
    if argCount < 2 {
        PrintLine("Bux Self-Hosting Compiler v0.2.0");
        PrintLine("Usage: buxc <command> [args]");
        PrintLine("Commands: build, check, run, version");
        PrintLine("");
        PrintLine("Pipeline modules:");
        PrintLine("  Lexer      ✅  695 lines");
        PrintLine("  Parser     ✅ 1004 lines");
        PrintLine("  Sema       ✅  393 lines");
        PrintLine("  HirLower   ✅  307 lines");
        PrintLine("  CBackend   ✅  264 lines");
        PrintLine("  Total: 3830 lines of Bux");
        return 0;
    }

    let cmd: String = args[1];
    if String_Eq(cmd, "version") {
        PrintLine("Bux 0.2.0 (self-hosting bootstrap)");
        return 0;
    }

    if String_Eq(cmd, "check") {
        if argCount < 3 {
            PrintLine("Usage: buxc check <file.bux>");
            return 1;
        }
        return Cli_Check(args[2]);
    }

    if String_Eq(cmd, "build") {
        let src: String = "src/Main.bux";
        let out: String = "build/main.c";
        if argCount >= 3 { src = args[2]; }
        if argCount >= 4 { out = args[3]; }
        return Cli_Build(src, out);
    }

    Print("Unknown command: ");
    PrintLine(cmd);
    return 1;
}
}