const std = @import("std");
const zeit = @import("zeit");
const Data = @import("types.zig");

pub fn dateFmt(allocator: std.mem.Allocator, epoch: i64) ![]const u8 {
    var date = std.ArrayList(u8).init(allocator);
    try (try zeit.instant(.{ .source = .{ .unix_timestamp = @divFloor(epoch, 1_000_000) } })).time().strftime(date.writer(), "%d %b %Y, %H:%M");
    return date.items;
}

pub fn dateCompare(self: *[]const u8, earliest: []const u8, latest: []const u8) bool {
    const range = if (self.len == 19) 4 else 2;
    const time = std.fmt.parseInt(u32, self[0..range], 10) catch 0;
    const etime = std.fmt.parseInt(u32, earliest[0..range], 10) catch 0;
    const ltime = std.fmt.parseInt(u32, latest[0..range], 10) catch 0;

    if (time != etime and time != ltime) {
        return (time > etime and time < ltime);
    } else {
        return dateCompare(self[range + 1 ..], earliest[range + 1 ..], latest[range + 1 ..]);
    }
}

pub fn scrobbleToRow(allocator: std.mem.Allocator, scrobble: Data.Scrobble) !Data.TableRow {
    var artistlist = std.ArrayList(Data.HyperlinkData).init(allocator);
    for (scrobble.artists_track) |a| {
        try artistlist.append(Data.HyperlinkData{ .name = a, .id = 0 });
    }
    return Data.TableRow{
        .song = .{ .name = scrobble.track, .id = 0 },
        .artistlist = artistlist.items,
        .album = .{ .name = scrobble.album, .id = 0 },
        .date = try dateFmt(allocator, scrobble.date),
    };
}

pub fn urlDecode(allocator: std.mem.Allocator, str: []const u8) ![]const u8 {
    var decoded = std.ArrayList(u8).init(allocator);
    var i: usize = 0;
    while (i < str.len) : (i += 1) {
        const v = str[i];
        if (v == '%') {
            if (i + 2 < str.len) {
                const hex = str[i + 1 .. i + 3];
                const char = try std.fmt.parseInt(u8, hex, 16);
                try decoded.append(char);
                i += 2;
            } else return error.InvalidInput;
        } else try decoded.append(v);
    }
    return decoded.toOwnedSlice();
}