using Inversion;
using Spry;
using Spry.Authentication;
using Statum;
using ClankerSaddle.Services;

namespace ClankerSaddle {

    /** Sealed task id carried by the task row actions. */
    public class TaskActionPrivate : Object {
        public int64 task_id { get; set; }
    }

    /** Sealed block identity carried by {@link AnswerBlockAction}. */
    public class BlockAnswerPrivate : Object {
        public int64 task_id { get; set; }
        public int64 block_id { get; set; }
    }

    /**
     * Common base for actions sealed against a task id: materialises the
     * typed private blob and exposes the resolved id (falling back to the
     * hidden `task_id` form field).
     */
    public abstract class SealedTaskAction : TypedStatumAction<TaskActionPrivate> {

        protected override Type private_type { get { return typeof(TaskActionPrivate); } }

        /** The sealed task id, or 0 when neither blob nor form field carried one. */
        protected int64 sealed_task_id() {
            var ctx = request_private;
            return ctx != null ? ((!)ctx).task_id : Forms.integer(request, "task_id", 0);
        }
    }

    /**
     * Creates a task from the queue form (project and title required).
     * Priority clamps to 1–9; the design-task checkbox and the optional
     * parent id support design tasks and manual subtasks. Branch fields
     * are optional — `branch_from` prefills from the project's default
     * branch and `task_branch` is inherited from the parent task when
     * left blank.
     */
    public class CreateTaskAction : StatumAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 project_id = Forms.integer(request, "project_id", 0);
            string title = Forms.field(request, "title");
            if (project_id <= 0 || title.length == 0) {
                return directives().notify("error", "Project and title are required").navigate("/tasks");
            }

            int64? parent_id = null;
            int64 parsed_parent = Forms.integer(request, "parent_task_id", 0);
            if (parsed_parent > 0) {
                parent_id = parsed_parent;
            }

            try {
                var task = yield tasks.create_task(project_id, title,
                    Forms.field_raw(request, "description"),
                    Forms.integer(request, "priority", 5),
                    Forms.field(request, "is_design_task") == "on", parent_id,
                    Forms.optional(request, "task_branch"),
                    Forms.optional(request, "branch_from"));
                if (Forms.field(request, "plan").length > 0) {
                    yield tasks.update_plan(task.id, Forms.field_raw(request, "plan"));
                }
                return directives().notify("success", @"Task '$(task.title)' queued")
                    .navigate(@"/tasks/$(task.id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not create the task: $(e.message)").navigate("/tasks");
            }
        }
    }

    /**
     * Saves the editable fields of a task; the id comes from the sealed
     * {@link TaskActionPrivate} blob (the hidden form field is a
     * fallback).
     */
    public class UpdateTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives().navigate("/tasks");
            }

            try {
                int64? priority = null;
                if (Forms.field(request, "priority").length > 0) {
                    priority = Forms.integer(request, "priority", 5);
                }
                yield tasks.update_task(task_id,
                    Forms.optional(request, "title"),
                    request.form != null ? Forms.field(request, "description") : null,
                    priority,
                    Forms.optional(request, "status"));
                yield tasks.set_branch_fields(task_id,
                    Forms.optional(request, "task_branch"),
                    Forms.optional(request, "branch_from"));
                return directives().notify("success", "Task saved").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not save the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Appends a comment to a task as the signed-in user. An optional
     * `quote` field carries text the user highlighted in the terminal log
     * or an RFC body; the quote is stored with the comment and delivered
     * to the saddle as a quote block.
     */
    public class AddCommentAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            string body = Forms.field_raw(request, "body");
            string quote = Forms.field_raw(request, "quote");
            if (task_id <= 0 || body.length == 0) {
                return directives().notify("error", "A comment body is required").navigate(@"/tasks/$(task_id)");
            }

            var me = SpryAuth.current(request);
            try {
                yield tasks.add_comment(task_id, @"user:$(me.username)", body, quote);
                yield tasks.log_session_entry(task_id, "user-comment",
                    @"comment by user:$(me.username)", quote.length > 0 ? "> " + quote.replace("\n", "\n> ") + "\n\n" + body : body);
                // Terminals post with a return_to so the live view survives
                // the comment; every other caller lands on the task page.
                string return_to = Forms.field(request, "return_to");
                string destination = return_to.length > 0 && return_to.has_prefix("/")
                    ? return_to : @"/tasks/$(task_id)";
                return directives().notify("success", "Comment added").navigate(destination);
            } catch (Error e) {
                return directives().notify("error", @"Could not add the comment: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Saves the task's markdown plan from the web UI's plan editor (the
     * human counterpart of the agent's `saddle plan`).
     */
    public class UpdatePlanAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives().navigate("/tasks");
            }

            try {
                yield tasks.update_plan(task_id, Forms.field_raw(request, "plan"));
                return directives().notify("success", "Plan saved").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not save the plan: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Records the human's answer to a block; the task and block ids come
     * from the sealed {@link BlockAnswerPrivate} blob. Question blocks
     * submit either a chosen `option` or the free-text `other` field.
     * Answers are stored verbatim — the saddle daemon applies its own
     * "Human selected: …" formatting, so a stored prefix would wrap the
     * answer a second time.
     */
    public class AnswerBlockAction : TypedStatumAction<BlockAnswerPrivate> {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        protected override Type private_type { get { return typeof(BlockAnswerPrivate); } }

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            var ctx = request_private;
            if (ctx == null) {
                return directives().navigate("/tasks");
            }
            int64 task_id = ((!)ctx).task_id;

            string option = Forms.field(request, "option");
            string other = Forms.field_raw(request, "other");
            string answer = Forms.field_raw(request, "answer");
            if (option == "__other__") {
                answer = other.strip().length > 0 ? other.strip() : answer;
            } else if (option.length > 0) {
                answer = option;
            }
            if (answer.length == 0) {
                return directives().notify("error", "An answer is required").navigate(@"/tasks/$(task_id)");
            }

            try {
                yield tasks.answer_block(((!)ctx).block_id, answer);
                return directives().notify("success", "Answer recorded; the saddle will collect it")
                    .navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not answer the block: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /** Creates a child task under the sealed parent task id. */
    public class CreateSubtaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            string title = Forms.field(request, "title");
            if (task_id <= 0 || title.length == 0) {
                return directives().notify("error", "A subtask title is required").navigate(@"/tasks/$(task_id)");
            }

            try {
                yield tasks.create_subtask(task_id, title, Forms.field_raw(request, "description"));
                return directives().notify("success", "Subtask created").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not create the subtask: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /** Adds a dependency edge from the sealed task to the form's target. */
    public class AddDependencyAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            int64 depends_on = Forms.integer(request, "depends_on_task_id", 0);
            if (task_id <= 0 || depends_on <= 0) {
                return directives().notify("error", "Pick a task to depend on").navigate(@"/tasks/$(task_id)");
            }

            try {
                yield tasks.add_dependency(task_id, depends_on);
                return directives().notify("success", "Dependency added").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not add the dependency: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Completes a task (summary and working branch from the form); closes
     * the open session and frees the saddle running it.
     */
    public class CompleteTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives().navigate("/tasks");
            }

            try {
                yield tasks.complete_task(task_id, Forms.optional(request, "summary"),
                    Forms.optional(request, "working_branch"), "done");
                return directives().notify("success", "Task completed").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not complete the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Cancels a task (status 'failed'); the sealed id comes from the task
     * page's cancel button.
     */
    public class CancelTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives().navigate("/tasks");
            }

            try {
                yield tasks.cancel_task(task_id);
                return directives().notify("success", "Task cancelled").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not cancel the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * The task detail page's polling action: rebuilds the `task` slot from
     * current data so the three-second client poll shows live comments,
     * blocks, output-driven status changes and completions. Navigates
     * nowhere; a failed reload leaves the client's state untouched.
     */
    public class RefreshTaskDataAction : SealedTaskAction {

        private TaskService task_service = inject<TaskService>();
        private ProjectService project_service = inject<ProjectService>();
        private SaddleService saddle_service = inject<SaddleService>();
        private RuleService rule_service = inject<RuleService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives();
            }

            var state = yield TaskDetailState.build(state_service, task_service,
                project_service, saddle_service, rule_service, action_registry, task_id);
            return directives().set(state);
        }
    }
}