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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

const std = @import("std");
const clap = @import("clap");
const core = @import("core");

const connection = @import("../connection.zig");
const State = @import("../State.zig");
const ExitCode = @import("../exit.zig").ExitCode;

const parser = .{
    .format = clap.parsers.enumeration(core.image.ContentType),
    .px = clap.parsers.int(usize, 10),
    .scaling = clap.parsers.enumeration(core.image.ScalingMethod),
    .image_key = clap.parsers.string,
};

const params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\-f, --format <format> Image format.
    \\Available values are:
    \\* jpeg
    \\* png
    \\-s, --scaling <scaling> Scaling method to use.
    \\Available values are:
    \\* fit
    \\* fill
    \\* stretch
    \\-w, --width <px> Required when --scaling is set.
    \\-h, --height <px> Required when --scaling is set.
    \\<image_key>
    \\
);

pub fn run(allocator: std.mem.Allocator, iter: *std.process.ArgIterator) ExitCode {
    var diag = clap.Diagnostic{};
    var res = clap.parseEx(clap.Help, &params, parser, iter, .{
        .diagnostic = &diag,
        .allocator = allocator,
    }) catch |err| {
        diag.report(std.io.getStdErr().writer(), err) catch {};
        return ExitCode.incorrect_usage;
    };
    defer res.deinit();

    if (res.args.help > 0) {
        clap.help(std.io.getStdOut().writer(), clap.Help, &params, .{}) catch {
            return ExitCode.stdout_write_failed;
        };
        return ExitCode.ok;
    }

    const image_key: []const u8 = res.positionals[0] orelse {
        std.log.err("image_key is required", .{});
        clap.help(std.io.getStdErr().writer(), clap.Help, &params, .{}) catch {
            return ExitCode.stdout_write_failed;
        };
        return ExitCode.incorrect_usage;
    };
    const image_key_z = allocator.dupeZ(u8, image_key) catch {
        std.log.err("Unable to allocate memory for image key (Out of memory)", .{});
        return ExitCode.out_of_memory;
    };
    defer allocator.free(image_key_z);

    const opts = core.image.GetOptions.makeRetained() orelse {
        std.log.err("Unable to allocate options struct (Out of memory)", .{});
        return ExitCode.out_of_memory;
    };
    defer opts.release();

    if (res.args.format) |format| {
        opts.setContentType(format);
    }

    if (res.args.scaling) |scaling| {
        const width = res.args.width orelse {
            std.log.err("--width is required when --scaling is set", .{});
            return ExitCode.incorrect_usage;
        };

        const height = res.args.height orelse {
            std.log.err("--height is required when --scaling is set", .{});
            return ExitCode.incorrect_usage;
        };

        opts.setSize(scaling, width, height);
    }

    const conn = connection.make(allocator) catch |err| {
        std.log.err("Unable to establish a connection: {s}", .{@errorName(err)});
        return switch (err) {
            error.OutOfMemory => ExitCode.out_of_memory,
            else => ExitCode.not_ok,
        };
    };
    defer conn.release();

    while (true) {
        const ev = conn.getEvent() orelse {
            std.log.err("Got empty event, terminating", .{});
            return ExitCode.not_ok;
        };
        defer ev.release();

        switch (ev.internal.payload) {
            .connection_error => |err_ev| {
                std.log.err("Failed to read event: {s}", .{@tagName(err_ev.code)});
                return ExitCode.not_ok;
            },
            .connected => {
                break;
            },
            else => {
                continue;
            },
        }
    }

    const loop_thread = std.Thread.spawn(.{}, consumeEvent, .{conn}) catch |err| {
        std.log.err("Failed to spawn message read thread: {s}", .{@errorName(err)});
        return ExitCode.not_ok;
    };
    defer {
        conn.disconnect();
        loop_thread.join();
    }

    const result = conn.getImage(image_key_z.ptr, opts) orelse {
        std.log.err("Failed to get image: OutOfMemory", .{});
        return ExitCode.out_of_memory;
    };
    defer result.release();

    if (result.code != .ok) {
        std.log.err("Failed to get image: {s}", .{@tagName(result.code)});
        return if (result.code == .out_of_memory) ExitCode.out_of_memory else ExitCode.not_ok;
    }

    const data = result.image orelse {
        std.log.err("get_image returned ok result, but image field is null", .{});
        return ExitCode.not_ok;
    };

    std.io.getStdOut().writeAll(data.data_ptr[0..data.data_len]) catch |err| {
        std.log.err("Failed to write to stdouit: {s}", .{@errorName(err)});
        return ExitCode.stdout_write_failed;
    };

    return ExitCode.ok;
}

fn consumeEvent(conn: *core.connection.Connection) void {
    const ev = conn.getEvent() orelse {
        return;
    };
    defer ev.release();
}