#include <argparse.h>
#include <scc_lexer.h>
#include <scc_pproc.h>

#include <ast_dump.h>
#include <scc_parser.h>
// #include <ir_dump.h>
// #include <scc_ast2ir.h>

typedef struct {
    const char *input_file;
    const char *output_file;
    int verbose;
    scc_argparse_list_t include_paths;
    cbool emit_lex;
    cbool emit_pp;
    cbool emit_ast;
    cbool emit_ir;
} scc_config_t;

static void setup_argparse(scc_argparse_t *argparse, scc_config_t *config,
                           scc_argparse_lang_t lang) {
    enum {
        SCC_HINT_PROG_NAME,
        SCC_HINT_DESCRIPTION,
        SCC_HINT_OUTPUT_FILE,
        SCC_HINT_INPUT_FILE,
        SCC_HINT_INCLUDE_PATH,
        SCC_HINT_VERBOSE,

        SCC_HINT_EMIT_LEX,
        SCC_HINT_EMIT_PP,
        SCC_HINT_EMIT_AST,
        SCC_HINT_EMIT_IR,
    };
    static const char *scc_hints_en[] = {
        [SCC_HINT_PROG_NAME] = "scc",
        [SCC_HINT_DESCRIPTION] = "A simple C compiler",
        [SCC_HINT_OUTPUT_FILE] =
            "Output file (`-` means standard output stream file)",
        [SCC_HINT_INPUT_FILE] = "Input source file",
        [SCC_HINT_INCLUDE_PATH] = "Add directory to the include search paths",
        [SCC_HINT_VERBOSE] = "Increase verbosity (can be used multiple times)",
        [SCC_HINT_EMIT_LEX] = "Generate lexer sources tokens and exit",
        [SCC_HINT_EMIT_PP] = "Generate preprocessed tokens and exit",
        [SCC_HINT_EMIT_AST] = "Generate AST and exit",
        [SCC_HINT_EMIT_IR] = "Generate IR and exit",
    };
    static const char *scc_hints_zh[] = {
        [SCC_HINT_PROG_NAME] = "scc",
        [SCC_HINT_DESCRIPTION] = "一个简单的C编译器",
        [SCC_HINT_OUTPUT_FILE] = "输出文件(`-`表示标准输出流文件)",
        [SCC_HINT_INPUT_FILE] = "输入源文件",
        [SCC_HINT_INCLUDE_PATH] = "添加系统头文件到搜索路径",
        [SCC_HINT_VERBOSE] = "增加详细输出(可多次使用)",
        [SCC_HINT_EMIT_LEX] = "生成`源代码的词法单元`并退出",
        [SCC_HINT_EMIT_PP] = "生成`预处理后的词法单元`并退出",
        [SCC_HINT_EMIT_AST] = "生成`抽象语法树`并退出",
        [SCC_HINT_EMIT_IR] = "生成`中间代码`并退出",
    };

    const char **scc_hints;
    switch (lang) {
    case SCC_ARGPARSE_LANG_EN:
        scc_hints = scc_hints_en;
        break;
    case SCC_ARGPARSE_LANG_ZH:
        scc_hints = scc_hints_zh;
        break;
    default:
        scc_hints = scc_hints_en;
        break;
    }

    scc_argparse_init(argparse, scc_hints[SCC_HINT_PROG_NAME],
                      scc_hints[SCC_HINT_DESCRIPTION]);
    argparse->lang = lang;
    scc_argparse_cmd_t *root = scc_argparse_get_root(argparse);

    // -o, --output
    scc_argparse_opt_t opt_output;
    scc_argparse_opt_init(&opt_output, 'o', "output",
                          scc_hints[SCC_HINT_OUTPUT_FILE]);
    scc_argparse_spec_setup_string(&opt_output.spec, &(config->output_file));
    scc_argparse_cmd_add_opt(root, &opt_output);

    // input file (必需)
    scc_argparse_arg_t arg_input;
    scc_argparse_arg_init(&arg_input, "input", scc_hints[SCC_HINT_INPUT_FILE]);
    scc_argparse_spec_setup_string(&arg_input.spec, &(config->input_file));
    scc_argparse_spec_set_required(&arg_input.spec, true);
    scc_argparse_cmd_add_arg(root, &arg_input);

    // -I, --include (添加额外的系统头文件搜索路径)
    scc_argparse_opt_t opt_include;
    scc_argparse_opt_init(&opt_include, 'I', "include",
                          scc_hints[SCC_HINT_INCLUDE_PATH]);
    scc_argparse_spec_setup_list(&opt_include.spec, &(config->include_paths));
    scc_argparse_cmd_add_opt(root, &opt_include);

    // -v, --verbose (计数)
    scc_argparse_opt_t opt_verbose;
    scc_argparse_opt_init(&opt_verbose, 'V', "verbose",
                          scc_hints[SCC_HINT_VERBOSE]);
    scc_argparse_spec_setup_count(&opt_verbose.spec, &(config->verbose));
    scc_argparse_cmd_add_opt(root, &opt_verbose);

    // --emit-lex
    scc_argparse_opt_t opt_lex;
    scc_argparse_opt_init(&opt_lex, 0, "emit-lex",
                          scc_hints[SCC_HINT_EMIT_LEX]);
    scc_argparse_spec_setup_bool(&opt_lex.spec, &(config->emit_lex));
    scc_argparse_cmd_add_opt(root, &opt_lex);

    // --emit-pp
    scc_argparse_opt_t opt_pp;
    scc_argparse_opt_init(&opt_pp, 0, "emit-pp", scc_hints[SCC_HINT_EMIT_PP]);
    scc_argparse_spec_setup_bool(&opt_pp.spec, &(config->emit_pp));
    scc_argparse_cmd_add_opt(root, &opt_pp);

    // -T, --emit-ast
    scc_argparse_opt_t opt_ast;
    scc_argparse_opt_init(&opt_ast, 'T', "emit-ast",
                          scc_hints[SCC_HINT_EMIT_AST]);
    scc_argparse_spec_setup_bool(&opt_ast.spec, &(config->emit_ast));
    scc_argparse_cmd_add_opt(root, &opt_ast);

    // -R, --emit-ir
    scc_argparse_opt_t opt_ir;
    scc_argparse_opt_init(&opt_ir, 'R', "emit-ir", scc_hints[SCC_HINT_EMIT_IR]);
    scc_argparse_spec_setup_bool(&opt_ir.spec, &(config->emit_ir));
    scc_argparse_cmd_add_opt(root, &opt_ir);
}

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

static void print_ring(scc_lexer_tok_ring_t *ring, int verbose) {
    scc_lexer_tok_t tok = {0};
    int ret = 0;
    while (1) {
        scc_ring_next_consume(*ring, tok, ret);
        if (ret == false || tok.type == SCC_TOK_EOF) {
            break;
        }
        if (verbose == 0) {
            scc_printf("%s ", scc_get_tok_name(tok.type));
        } else if (verbose >= 1) {
            scc_printf(
                "token [%-8s] `%s` at %s:%d:%d\n", scc_get_tok_name(tok.type),
                tok.type != SCC_TOK_ENDLINE ? scc_cstring_as_cstr(&tok.lexeme)
                                            : "\\n",
                tok.loc.name, tok.loc.line, tok.loc.col);
        }
        scc_lexer_tok_drop(&tok);
    }
}

static void print_file(scc_lexer_tok_ring_t *ring, const char *file_name) {
    scc_lexer_tok_t tok = {0};
    int ret = 0;
    scc_file_t fp = null;
    cbool is_stdout = scc_strcmp(file_name, "-") == 0;
    if (!is_stdout) {
        fp = scc_fopen(file_name, SCC_FILE_WRITE);
        if (fp == null) {
            LOG_FATAL("Failed to open file %s", file_name);
            return;
        }
    }
    while (1) {
        scc_ring_next_consume(*ring, tok, ret);
        if (ret == false || tok.type == SCC_TOK_EOF) {
            break;
        }
        if (is_stdout) {
            scc_printf("%s", scc_cstring_as_cstr(&tok.lexeme));
        } else {
            usize ret = scc_fwrite(fp, scc_cstring_as_cstr(&tok.lexeme),
                                   scc_cstring_len(&tok.lexeme));
            if (ret != scc_cstring_len(&tok.lexeme)) {
                LOG_FATAL("Failed to write to file %s", file_name);
            }
        }
        scc_lexer_tok_drop(&tok);
    }
    scc_fclose(fp);
}

int main(int argc, const char **argv, const char **envp) {
#ifdef _WIN32
    SetConsoleOutputCP(CP_UTF8);
    SetConsoleCP(CP_UTF8);
#endif

#ifndef SCC_DEFAULT_ARGPARSE_LANG
#define SCC_DEFAULT_ARGPARSE_LANG SCC_ARGPARSE_LANG_ZH
#endif

    scc_argparse_lang_t argparse_lang = SCC_DEFAULT_ARGPARSE_LANG;
    for (const char **env = envp; *env != null; env++) {
        const char *env_str = *env;
        if (scc_strcmp(env_str, "LANG=zh_CN.UTF-8") == 0) {
            argparse_lang = SCC_ARGPARSE_LANG_ZH;
        }
    }

    scc_config_t config = {
        .input_file = null,
        .verbose = 0,
        .output_file = null,
        .emit_ast = false,
        .emit_ir = false,
    };
    scc_vec_init(config.include_paths);

    scc_argparse_t argparse;
    setup_argparse(&argparse, &config, argparse_lang);
    int ret = scc_argparse_parse(&argparse, argc, argv);
    if (ret != 0) {
        scc_argparse_drop(&argparse);
        return 0;
    }
    scc_argparse_drop(&argparse);

    scc_sstream_t sstream;
    if (scc_sstream_init(&sstream, config.input_file, 1024)) {
        return 0;
    }

    scc_lexer_t lexer;
    scc_lexer_init(&lexer, scc_sstream_to_ring(&sstream));
    if (config.emit_lex) {
        scc_lexer_tok_ring_t *tok_ring = scc_lexer_to_ring(
            &lexer, 8, config.output_file == null ? false : true);
        if (config.output_file == null) {
            print_ring(tok_ring, config.verbose);
        } else {
            print_file(tok_ring, config.output_file);
        }
        return 0;
    }

    scc_pproc_t pproc;
    scc_pproc_init(&pproc, scc_lexer_to_ring(&lexer, 8, true));
    scc_vec_foreach(config.include_paths, i) {
        scc_pproc_add_include_path_cstr(&pproc,
                                        scc_vec_at(config.include_paths, i));
    }
    scc_lexer_tok_vec_t pproc_tok_vec;
    scc_vec_init(pproc_tok_vec);
    scc_cstring_t pproc_macro_name = scc_cstring_from_cstr("__SCC__");
    scc_pproc_add_object_macro(&(pproc.macro_table), &pproc_macro_name,
                               &pproc_tok_vec);
    if (config.emit_pp) {
        scc_lexer_tok_ring_t *tok_ring =
            scc_pproc_to_ring(&pproc, 8, true, true);
        if (config.output_file == null) {
            print_ring(tok_ring, config.verbose);
        } else {
            print_file(tok_ring, config.output_file);
        }
        return 0;
    }

    scc_lexer_tok_ring_t *tok_ring = scc_pproc_to_ring(&pproc, 8, false, false);
    scc_parser_t parser;
    scc_parser_init(&parser, tok_ring, null);
    scc_ast_translation_unit_t *translation_unit =
        scc_parse_translation_unit(&parser);

    scc_parser_drop(&parser);
    scc_pproc_drop(&pproc);
    scc_lexer_drop(&lexer);
    scc_sstream_drop(&sstream);

    if (config.emit_ast) {
        scc_tree_dump_ctx_t tree_dump;
        scc_tree_dump_ctx_init(&tree_dump, true, (void *)scc_fprintf,
                               (void *)scc_stdout);
        scc_ast_dump_node(&tree_dump, (scc_ast_node_t *)translation_unit);
        scc_tree_dump_ctx_drop(&tree_dump);
        return 0;
    }

    // scc_ir_builder_t ir_builder;
    // scc_ast2ir(translation_unit, &ir_builder);

    // if (config.emit_ir) {
    //     scc_ir_dump_ctx_t ir_dump_ctx;
    //     scc_tree_dump_ctx_t tree_dump; // 仅为 ir dump 辅助
    //     scc_tree_dump_ctx_init(&tree_dump, true);
    //     scc_ir_dump_ctx_init(&ir_dump_ctx, &tree_dump, &ir_builder.cprog,
    //                          &ir_builder.ctx);
    //     // scc_ir_dump_cprog(&ir_dump_ctx);
    //     scc_ir_dump_cprog_linear(&ir_dump_ctx);
    //     scc_tree_dump_ctx_drop(&tree_dump);
    //     return 0;
    // }

    scc_printf("output exe at %s", config.output_file);
    return 0;
}