#include "spl_ast2ir.h"

static spl_ir_node_ref_t spl_ir_const_comptime_int(spl_ir_builder_t *ir, const spl_sema_t *sema,
                                                   usize i) {
    return spl_ir_builder_type_const_int(ir, spl_type_builder_int(sema->type, 0, 0), i);
}

static spl_type_id_t tid_from_def(const spl_sema_t *sema, spl_def_id_t def) {
    spl_def_node_t *d = spl_def_node(sema->type, def);
    return d ? d->type_id : 0;
}

static spl_ir_node_ref_t transit(spl_ir_builder_t *ir, const spl_sema_t *sema,
                                 spl_ast_node_ref_t ref) {
    if (ref == 0)
        return 0;
    Assert(sema != NULL);
    spl_ast_node_t *n = spl_ast_node(sema->ast, ref);
    spl_ir_node_ref_t ret = 0;
    Assert(n != NULL);

    switch (n->kind) {
    case SPL_AST_NONE:
        UNREACHABLE();
        break;
    case SPL_AST_CONTAINER_MEMBERS: {
        vec_for(n->container_members, i) { transit(ir, sema, vec_at(n->container_members, i)); }
    } break;
    case SPL_AST_FN_DECL:
        TODO();
        break;
    case SPL_AST_FN_DEFINE: {
        spl_type_id_t tid = tid_from_def(sema, n->resolved_def_id);
        spl_type_node_t *fn_type = spl_type_node(sema->type, tid);
        Assert(fn_type && fn_type->kind == SPL_TYPE_FN);
        // n->fn_decl.attr_list; TODO @extern(vm) using extern attribute
        spl_ir_builder_fn_begin(ir, n->fn_decl.name, tid, (spl_ir_attr_t){0} /*TODO*/);

        spl_ir_builder_block_begin(ir);
        vec_for(n->fn_decl.block, i) { transit(ir, sema, vec_at(n->fn_decl.block, i)); }
        if (!ir->terminated) {
            spl_ir_builder_control_ret(ir, n->fn_decl.type_expr, 0);
        }
        spl_ir_builder_block_end(ir);
        spl_ir_builder_fn_end(ir);

    } break;
    case SPL_AST_TYPE_DECL:
        TODO();
        break;
    case SPL_AST_VAR_DECL: {
        spl_type_id_t tid = tid_from_def(sema, n->resolved_def_id);
        spl_ir_node_ref_t var_ref =
            spl_ir_builder_mem_alloca(ir, tid, spl_ir_const_comptime_int(ir, sema, 1));
        if (n->var_const_decl.expr) {
            spl_ir_builder_mem_store(ir, tid, var_ref, transit(ir, sema, n->var_const_decl.expr));
        }
    } break;
    case SPL_AST_CONST_DECL: {
        TODO();
    } break;
    case SPL_AST_MEMBER_DECL:
        TODO();
        break;
    case SPL_AST__COMPTIME_STMT:
    case SPL_AST__DIRECTIVE_BLOCK:
    case SPL_AST_PARAM_DECL:
        break;
    case SPL_AST_ATTR_ITEM:
    case SPL_AST_ARGG_INIT_ITEM: {
        TODO();
    } break;
    case SPL_AST_IF_STATEMENT: {
        spl_ir_node_ref_t ref = transit(ir, sema, n->if_statement.expr);
        ref = spl_ir_builder_control_br(ir, ref);
        spl_ir_builder_block_end(ir);
        usize true_block = spl_ir_builder_block_begin(ir);

        usize false_block = spl_ir_builder_block_begin(ir);
        spl_ir_builder_control_br_fixup(ir, ref, true_block, false_block);
    } break;
    case SPL_AST_IFVAR_STATEMENT:
    case SPL_AST_WHILE_STATEMENT:
    case SPL_AST_LOOP_STATEMENT:
    case SPL_AST_FOR_STATEMENT:
    case SPL_AST_MATCH_STATEMENT:
        TODO();
        break;
    case SPL_AST_RET_STATEMENT: {
        if (n->ret_statement.expr) {
            ret = transit(ir, sema, n->ret_statement.expr);
        }
        ret = spl_ir_builder_control_ret(ir, n->resolved_type_id, ret);
    } break;
    case SPL_AST_BREAK_STATEMENT:
    case SPL_AST_CONTINUE_STATEMENT:
    case SPL_AST_DEFER_STATEMENT:
    case SPL_AST_TRY_STATEMENT:
    case SPL_AST_CATCH_STATEMENT:
    case SPL_AST_ERRDEFER_STATEMEMT:
    case SPL_AST_EXPR_STATEMENT:
    case SPL_AST_PACKED_EXPR:
    case SPL_AST_ASSIGN_EXPR:
    case SPL_AST_ASSIGN_ADD_EXPR:
    case SPL_AST_ASSIGN_SUB_EXPR:
    case SPL_AST_ASSIGN_MUL_EXPR:
    case SPL_AST_ASSIGN_DIV_EXPR:
    case SPL_AST_ASSIGN_MOD_EXPR:
    case SPL_AST_ASSIGN_AND_EXPR:
    case SPL_AST_ASSIGN_OR_EXPR:
    case SPL_AST_ASSIGN_XOR_EXPR:
    case SPL_AST_ASSIGN_LSHIFT_EXPR:
    case SPL_AST_ASSIGN_USHIFT_EXPR:
    case SPL_AST_BOOL_OR_EXPR:
    case SPL_AST_BOOL_AND_EXPR:
    case SPL_AST_BIT_OR_EXPR:
    case SPL_AST_BIT_XOR_EXPR:
    case SPL_AST_BIT_AND_EXPR:
    case SPL_AST_CMP_EQ_EXPR:
    case SPL_AST_CMP_NE_EXPR:
    case SPL_AST_CMP_LE_EXPR:
    case SPL_AST_CMP_GE_EXPR:
    case SPL_AST_CMP_LT_EXPR:
    case SPL_AST_CMP_GT_EXPR:
    case SPL_AST_RANGE_EXPR:
    case SPL_AST_LSHIFT_EXPR:
    case SPL_AST_RSHIFT_EXPR:
    case SPL_AST_ADD_EXPR:
    case SPL_AST_SUB_EXPR:
    case SPL_AST_MUL_EXPR:
    case SPL_AST_DIV_EXPR:
    case SPL_AST_MOD_EXPR:
    case SPL_AST_MINUS_EXPR:
    case SPL_AST_NOT_EXPR:
    case SPL_AST_BIT_NOT_EXPR:
    case SPL_AST_ADDRESS_EXPR:
    case SPL_AST_CALL_EXPR:
    case SPL_AST_FIELD_EXPR:
    case SPL_AST_DEREF_EXPR:
    case SPL_AST_INDEX_EXPR:
    case SPL_AST_SLICE_EXPR:
    case SPL_AST_AS_EXPR:
        TODO();
        break;
    case SPL_AST_EXPR_INTEGER_LIT: {
        ret = spl_ir_builder_type_const_int(ir, n->resolved_type_id, n->primary_expr.integer_expr);
        break;
    }
    case SPL_AST_EXPR_FLOAT_LIT:
    case SPL_AST_EXPR_CHAR_LIT:
    case SPL_AST_EXPR_STRING_LIT: {
        TODO();
    } break;
    case SPL_AST_EXPR_TRUE: {
        return spl_ir_builder_type_const_bool(
            ir, spl_type_builder_simple(sema->type, SPL_TYPE_BOOL), true);
    } break;
    case SPL_AST_EXPR_FALSE: {
        return spl_ir_builder_type_const_bool(
            ir, spl_type_builder_simple(sema->type, SPL_TYPE_BOOL), false);
    }
    case SPL_AST_EXPR_NULL: {
        return spl_ir_builder_type_const_bool(ir, n->resolved_type_id, 0);
    } break;
    case SPL_AST_EXPR_UNDEFINED:
        break;
    case SPL_AST_EXPR_IDENT: {
    } break;
    case SPL_AST_ARGGREGATE_INIT: {
        vec_for(n->primary_expr.aggregate_init.expr, i) {
            transit(ir, sema, vec_at(n->primary_expr.aggregate_init.expr, i));
        }
    } break;
    case SPL_AST_EXPR_EXPR: {
        transit(ir, sema, n->primary_expr.expr);
    } break;
    case SPL_AST_ARRAY_LIT: {
        TODO();
    } break;
    case SPL_AST_BUILTIN_EXPR: {
        TODO();
    } break;
    case SPL_AST_BLOCK_EXPR: {
        vec_for(n->primary_expr.block_expr, i) {
            transit(ir, sema, vec_at(n->primary_expr.block_expr, i));
        }
    } break;
    case SPL_AST_BASE_TYPE_FN:
    case SPL_AST_BASE_TYPE_PATH:
        TODO();
        break;
    case SPL_AST_TYPE_POINTER:
    case SPL_AST_TYPE_ARRAY:
    case SPL_AST_TYPE_SLICE:
    case SPL_AST_TYPE_STRUCT:
    case SPL_AST_TYPE_UNION:
    case SPL_AST_TYPE_SHAPE:
    case SPL_AST_TYPE_ENUM:
    case SPL_AST_TYPE_VOID:
    case SPL_AST_TYPE_BOOL:
    case SPL_AST_TYPE_OPAQUE:
    case SPL_AST_TYPE_I8:
    case SPL_AST_TYPE_U8:
    case SPL_AST_TYPE_I16:
    case SPL_AST_TYPE_U16:
    case SPL_AST_TYPE_I32:
    case SPL_AST_TYPE_U32:
    case SPL_AST_TYPE_I64:
    case SPL_AST_TYPE_U64:
    case SPL_AST_TYPE_ISIZE:
    case SPL_AST_TYPE_USIZE:
    case SPL_AST_TYPE__F32:
    case SPL_AST_TYPE__F64:
    case SPL_AST_TYPE_ANY:
    case SPL_AST_TYPE_IDENT:
        break;
    case SPL_AST_COUNT:
        UNREACHABLE();
        break;
    }
    return ret;
}

void spl_ast2ir_init(spl_ast2ir_t *ast2ir, spl_ir_builder_t *ir, const spl_sema_t *sema) {
    ast2ir->sema = sema;
    ast2ir->ir = ir;
    ast2ir->err_count = 0;
}

void spl_ast2ir_drop(spl_ast2ir_t *ast2ir) {}

void spl_ast2ir_run(spl_ast2ir_t *ctx) { transit(ctx->ir, ctx->sema, ctx->sema->ast->root); }