#ifndef GEMTEXT_PARSER_H
#define GEMTEXT_PARSER_H 1

#include <pthread.h>  // pthread_mutex_t, pthread_cond_t
#include <stddef.h>   // size_t
#include <stdio.h>    // FILE

#define LBUF_SIZE 512

typedef enum {
    normalMode,
    preformattedMode,
    quoteMode,
    linkMode,
    h1Mode,
    h2Mode,
    h3Mode,
    listMode,
} gemtextParserMode;

typedef enum {
    lineStart,
    lineEnd,
    firstLinkChar,
    linkDisplayStart,
    linkDisplay,
    firstHashChar,
    secondHashChar,
    thirdHashChar,
    firstBacktickChar,
    secondBacktickChar,
    thirdBacktickChar,
    preformattedAlt,
    trimStart,
    normalState,
} gemtextParserState;

typedef enum {
    normalLine,
    linkLine,
    listLine,
    h1Line,
    h2Line,
    h3Line,
    preformattedLine,
    quoteLine,
    endOfStream,
} gemtextLineType;

typedef struct {
    size_t  capacity;
    size_t  len;
    char   *cursor;
    char   *buf;
} lineBuffer;

typedef struct {
    char *url;
    char *display;
} gemtextLink;

typedef struct {
    char *altText;
    char *body;
} preformattedNode;

typedef struct {
    FILE               *stream;
    gemtextParserMode   mode;
    gemtextParserState  state;
    lineBuffer          buffer;
    union {
        char           *linkUrl;
        char           *altText;
    };
} gemtextParser;

struct _gemtextLine {
    struct _gemtextLine *next;
    struct _gemtextLine *prev;
    gemtextLineType      lineType;
    union {
        char             *str;
        gemtextLink      *link;
        preformattedNode *node;
    };
};

typedef struct _gemtextLine gemtextLine;

typedef struct {
    pthread_cond_t   cond;
    size_t           count;
    pthread_mutex_t  mutex;
    gemtextLine     *head;
    gemtextLine     *tail;
} gemtextLineQueue;

#endif