#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "string.h"
#include "parsers/json.h"

typedef enum {
    music = 0,
    art = 1,
    blog = 2,
} MediaType;

MediaType read_media_type(char *name) {
    char *type_names[] = {"music", "art", "blog"};
    for (int i = 0; i < sizeof(type_names) / sizeof(char*); i++) {
        if (strcmp(name, type_names[i]) == 0) return i;
    }
    return -1;
}

void print_help() {
    printf("usage: compile <-t media_type> <-j json_file> <-h html_file> [output_file]\n");
    printf("valid media types: music, art, blog\n");
    printf("if output_file is not specified, the output will be written to stdout.\n");
}

int main(int argc, char **argv) {
    if (argc <= 1) {
        print_help();
        return 0;
    }

    MediaType media_type = -1;
    FILE *json_file = NULL;
    FILE *html_file = NULL;
    size_t optind = 0;

    for (optind = 1; optind < argc && argv[optind][0] == '-'; optind++) {
        switch (argv[optind][1]) {
            case 't':
                media_type = read_media_type(argv[++optind]);
                if (media_type < 0) {
                    fprintf(stderr, "media type `%s` is not implemented!\n\n", argv[optind]);
                    print_help();
                    exit(EXIT_FAILURE);
                }
                break;
            case 'j':
                if (optind++ >= argc) {
                    fprintf(stderr, "-j was passed, but no file path was given!\n\n");
                    exit(EXIT_FAILURE);
                }
                json_file = fopen(argv[optind], "r");
                if (json_file == NULL) {
                    fprintf(stderr, "failed to open file %s!\n\n", argv[optind]);
                    exit(EXIT_FAILURE);
                }
                break;
            case 'h':
                if (optind++ >= argc) {
                    fprintf(stderr, "-h was passed, but no file path was given!\n\n");
                    exit(EXIT_FAILURE);
                }
                html_file = fopen(argv[optind], "r");
                if (html_file == NULL) {
                    fprintf(stderr, "failed to open file %s!\n\n", argv[optind]);
                    exit(EXIT_FAILURE);
                }
                break;
            default:
                print_help();
                exit(EXIT_FAILURE);
        }
    }

    if (media_type < 0) {
        fprintf(stderr, "media type not provided!\n\n");
        print_help();
        exit(EXIT_FAILURE);
    }
    if (json_file == NULL) {
        fprintf(stderr, "JSON file not provided!\n\n");
        print_help();
        exit(EXIT_FAILURE);
    }
    if (html_file == NULL) {
        fprintf(stderr, "HTML file not provided!\n\n");
        print_help();
        exit(EXIT_FAILURE);
    }

    // get length of file
    fseek(json_file, (long)-sizeof(char), SEEK_END);
    size_t json_length = ftell(json_file);
    fseek(json_file, 0, SEEK_SET);

    // read file to buffer
    char json_buf[json_length + 1];
    fread(json_buf, 1, json_length, json_file);
    json_buf[json_length] = '\0';

    // parse the file
    size_t offset = 0;
    JsonObject *json = json_parse(json_buf, &offset);
    if (json == NULL) {
        fprintf(stderr, "failed to parse input file!\n");
        exit(EXIT_FAILURE);
    }

    char *title = (char*)((JsonObject*)json_get(json, "title"))->value;
    char *type = (char*)((JsonObject*)json_get(json, "type"))->value;
    float year = *(float*)((JsonObject*)json_get(json, "year"))->value;
    char *artwork = (char*)((JsonObject*)json_get(json, "artwork"))->value;
    char *buylink = (char*)((JsonObject*)json_get(json, "buylink"))->value;
    printf("title: %s\n", title);
    printf("type: %s\n", type);
    printf("year: %.0f\n", year);
    printf("artwork: %s\n", artwork);
    printf("buylink: %s\n", buylink);

    JsonObject *links = (JsonObject*)json_get(json, "links");
    for (size_t i = 0; i < links->length; i++) {
        char path[256];
        sprintf(path, "links.%zu.title", i);
        char *title = (char*)((JsonObject*)json_get(json, path))->value;
        sprintf(path, "links.%zu.url", i);
        char *url = (char*)((JsonObject*)json_get(json, path))->value;
        printf("links.%zu.title: %s\n", i, title);
        printf("links.%zu.url: %s\n", i, url);
    }

    // get length of file
    fseek(html_file, (long)-sizeof(char), SEEK_END);
    size_t html_length = ftell(html_file);
    fseek(html_file, 0, SEEK_SET);

    // read file to buffer
    char html_buf[html_length + 1];
    fread(html_buf, 1, html_length, html_file);
    html_buf[html_length] = '\0';

    char *html_out = strrep(html_buf, "{title}", title);

    printf("%s\n", html_out);

    json_free(json);

    return 0;
}