#pragma once

#include <cstddef>
#ifndef TSDB_CPP_HPP
#define TSDB_CPP_HPP

#include <cstdio>
#include <cstring>
#include <memory>
#include <string>
#include <string_view>
#include <vector>

#include "tsdb.rust.h"

#ifdef _WIN32
#define TSDB_EXPORT __declspec(dllexport)
#else
#define TSDB_EXPORT
#endif

namespace tsdb_cpp {

/// @brief A point in time series database.
struct point {
    const std::string& name_;
    double value_;
    long long nanoseconds_;
    point(const std::string& name, double value, long long nanoseconds) : name_(name), value_(value), nanoseconds_(nanoseconds) {}
};

struct tsdb_batch_insertion {
    using UniqPtr = std::unique_ptr<TsdbEntryInsertBatch_t, decltype(&rust_tsdb_lf_entry_insert_batch_drop)>;

    tsdb_batch_insertion(std::nullptr_t) : impl_(nullptr, rust_tsdb_lf_entry_insert_batch_drop) {}
    ~tsdb_batch_insertion() {
        if (impl_) {
            impl_ = nullptr;
        }
    }
    tsdb_batch_insertion(tsdb_batch_insertion&& other) : impl_(std::move(other.impl_)) {}

    tsdb_batch_insertion& operator=(tsdb_batch_insertion rhs) {
        std::swap(impl_, rhs.impl_);
        return *this;
    }

    operator bool() const { return impl_ != nullptr; }

    bool close() {
        if (impl_) {
            auto impl = std::move(impl_);
            return rust_tsdb_lf_entry_batch_commit_and_close(impl.get());
        }
        return true;
    }

    bool add_point(std::string const& name, double value, long long nanoseconds) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_batch_add_point(impl_.get(), name.c_str(), value, nanoseconds);
    }

private:
    friend struct tsdb_entry;
    friend struct tsdb_entry_impl;

    tsdb_batch_insertion(UniqPtr impl) : impl_(std::move(impl)) {}
    bool ensure_open() const {
        if (!impl_) {
            rust_log_error_custom("tsdb-LF batch insertion is not open");
            return false;
        }
        return true;
    }

    UniqPtr impl_;
};

struct tsdb_entry {
    using UniqPtr = std::unique_ptr<TsdbEntry_t, decltype(&rust_drop_tsdb_lf_entry)>;

    tsdb_entry(const std::string& remote, uint16_t port = 8123) : impl_(nullptr, rust_drop_tsdb_lf_entry) {
        impl_ = UniqPtr(rust_create_tsdb_lf_entry(remote.c_str(), port), rust_drop_tsdb_lf_entry);
    }
    tsdb_entry(std::nullptr_t) : impl_(nullptr, rust_drop_tsdb_lf_entry) {}
    ~tsdb_entry() {
        if (impl_) {
            impl_ = nullptr;
        }
    }
    tsdb_entry(tsdb_entry&& other) : impl_(std::move(other.impl_)) {}

    tsdb_entry& operator=(tsdb_entry rhs) {
        std::swap(impl_, rhs.impl_);
        return *this;
    }

    operator bool() const { return impl_ != nullptr; }

    bool close() {
        if (impl_) {
            auto impl = std::move(impl_);
            return rust_tsdb_lf_entry_end_commit_insert(impl.get());
        }
        return true;
    }

    bool set_async_insert_buffer_size(size_t size) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_set_async_insert_buffer_size(impl_.get(), size);
    }

    size_t get_async_insert_buffer_size() const {
        if (!ensure_open()) {
            return 0;
        }
        return rust_tsdb_lf_entry_get_async_insert_buffer_size(impl_.get());
    }

    bool set_active_table(const std::string& table_name) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_set_active_table(impl_.get(), table_name.c_str());
    }

    bool set_metric_name(const std::string& metric_name) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_set_metric_name(impl_.get(), metric_name.c_str());
    }

    bool insert_point(const point& p) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_insert_point(impl_.get(), p.name_.c_str(), p.value_, p.nanoseconds_);
    }

    bool insert_points(const std::vector<point>& points) {
        if (!ensure_open()) {
            return false;
        }
        // for (const auto& p : points) {
        //     if (!insert_point(p)) {
        //         return false;
        //     }
        // }
        struct InsertState {
            const std::vector<point>& points;
            uint64_t index;
        } state{points, 0};
        return rust_tsdb_lf_entry_insert_points_with_callback(
            impl_.get(),
            [](void* opaque) -> FfiMyRow {
                auto state = static_cast<InsertState*>(opaque);
                if (state->index >= state->points.size()) {
                    return {{(uint8_t*)"", 0}, 0, 0};
                }
                auto& p = state->points[state->index];
                state->index++;
                return {{(uint8_t*)p.name_.c_str(), p.name_.size()}, p.value_, p.nanoseconds_};
            },
            &state);
    }

    bool insert_point(const std::string& name, double value, long long nanoseconds) {
        if (!ensure_open()) {
            return false;
        }
        return rust_tsdb_lf_entry_insert_point(impl_.get(), name.c_str(), value, nanoseconds);
    }

    tsdb_batch_insertion new_batch_insert() {
        if (!ensure_open()) {
            return tsdb_batch_insertion(nullptr);
        }
        return tsdb_batch_insertion({rust_tsdb_lf_entry_new_insert_batch(impl_.get()), rust_tsdb_lf_entry_insert_batch_drop});
    }

private:
    bool ensure_open() const {
        if (!impl_) {
            rust_log_error_custom("tsdb-LF entry is not open");
            return false;
        }
        return true;
    }

    UniqPtr impl_;
};

}  // namespace tsdb_cpp

#endif  // TSDB_CPP_HPP