import type { WorkEventKind } from "@code/primitives/work";
import {
  decodeDefinition,
  WorkQuestion,
} from "@code/primitives/work-definition";
import { validateDesignPacket } from "@code/primitives/work-design";
import { makeFunctionReference } from "convex/server";
import { ConvexError, v } from "convex/values";
import { Effect, Schema } from "effect";

import type { Doc, Id } from "./_generated/dataModel";
import {
  env,
  internalAction,
  internalMutation,
  internalQuery,
  mutation,
  query,
} from "./_generated/server";
import type { MutationCtx, QueryCtx } from "./_generated/server";
import { requireCurrentOrganization, requireProjectMember } from "./authz";

const plannerRef = makeFunctionReference<
  "action",
  { organizationId: Id<"organizations">; workId: Id<"works"> }
>("workPlanning:runPlanner");
const submitDefinitionRef = makeFunctionReference<
  "mutation",
  { payloadJson: string; token: string; workId: Id<"works"> },
  { definitionId: Id<"workDefinitions">; version: number }
>("workPlanning:submitDefinitionProposal");
const submitDesignRef = makeFunctionReference<
  "mutation",
  { payloadJson: string; token: string; workId: Id<"works"> },
  { designId: Id<"designPackets">; version: number }
>("workPlanning:submitDesignProposal");
const plannerContextRef = makeFunctionReference<
  "query",
  { workId: Id<"works"> },
  {
    existingDefinition?: string;
    objective: string;
    phase: "definition" | "design";
    status: string;
    title: string;
  } | null
>("workPlanning:getPlannerContext");
const plannerFailureRef = makeFunctionReference<
  "mutation",
  { workId: Id<"works">; error: string },
  null
>("workPlanning:recordPlannerFailure");

const parsePayload = (payloadJson: string): unknown => {
  try {
    return JSON.parse(payloadJson) as unknown;
  } catch {
    throw new ConvexError("Proposal payload must be valid JSON");
  }
};

const objectPayload = (payloadJson: string): Record<string, unknown> => {
  const value = parsePayload(payloadJson);
  if (typeof value !== "object" || value === null || Array.isArray(value)) {
    throw new ConvexError("Proposal payload must be an object");
  }
  return value as Record<string, unknown>;
};

const requireWork = async (
  ctx: QueryCtx | MutationCtx,
  workId: Id<"works">
): Promise<Doc<"works">> => {
  const work = await ctx.db.get(workId);
  if (!work) {
    throw new ConvexError("Work not found");
  }
  return work;
};

const appendEvent = async (
  ctx: MutationCtx,
  workId: Id<"works">,
  kind: WorkEventKind,
  idempotencyKey: string,
  referenceId?: string,
  payloadJson?: string
) => {
  const existing = await ctx.db
    .query("workEvents")
    .withIndex("by_work_and_idempotencyKey", (q) =>
      q.eq("workId", workId).eq("idempotencyKey", idempotencyKey)
    )
    .unique();
  if (existing) {
    return existing._id;
  }
  return await ctx.db.insert("workEvents", {
    createdAt: Date.now(),
    idempotencyKey,
    kind,
    workId,
    ...(referenceId ? { referenceId } : {}),
    ...(payloadJson ? { payloadJson } : {}),
  });
};

const supersedePriorDefinitions = async (
  ctx: MutationCtx,
  workId: Id<"works">
) => {
  const previous = await ctx.db
    .query("workDefinitions")
    .withIndex("by_work_and_version", (q) => q.eq("workId", workId))
    .collect();
  for (const row of previous) {
    if (row.status === "current") {
      await ctx.db.patch(row._id, { status: "superseded" });
    }
  }
};

const supersedePriorDesigns = async (ctx: MutationCtx, workId: Id<"works">) => {
  const prior = await ctx.db
    .query("designPackets")
    .withIndex("by_work_and_version", (q) => q.eq("workId", workId))
    .collect();
  for (const row of prior) {
    if (row.status === "current") {
      await ctx.db.patch(row._id, { status: "superseded" });
    }
  }
};

/**
 * Starts Definition planning for a proposed Work. No approval is needed.
 * The planner workflow produces a Definition; persistence auto-advances to Design.
 */
export const requestDefinition = mutation({
  args: { workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await requireWork(ctx, args.workId);
    await requireProjectMember(ctx, work.projectId);
    if (work.status !== "proposed" && work.status !== "defining") {
      throw new ConvexError("Work is not available for definition");
    }
    const now = Date.now();
    await ctx.db.patch(work._id, { status: "defining", updatedAt: now });
    await appendEvent(
      ctx,
      work._id,
      "definition.requested",
      `definition-requested:${work._id}`
    );
    await ctx.scheduler.runAfter(0, plannerRef, {
      organizationId: work.organizationId,
      workId: work._id,
    });
    return { status: "defining" as const };
  },
});

const saveDefinition = async (
  ctx: MutationCtx,
  work: Doc<"works">,
  payloadJson: string,
  createdBy: string
) => {
  if (work.status === "executing" || work.status === "verifying") {
    throw new ConvexError(
      "Cannot revise Work during execution or verification"
    );
  }
  const decoded = await Effect.runPromise(
    decodeDefinition({
      ...objectPayload(payloadJson),
      version: (work.definitionVersion ?? 0) + 1,
    })
  ).catch((error: unknown) => {
    throw new ConvexError(
      error instanceof Error ? error.message : "Invalid Definition"
    );
  });
  const { version } = decoded;
  await supersedePriorDefinitions(ctx, work._id);
  // Revising a Definition invalidates any existing Design so planning restarts.
  await supersedePriorDesigns(ctx, work._id);
  const definitionId = await ctx.db.insert("workDefinitions", {
    createdAt: Date.now(),
    createdBy,
    payloadJson: JSON.stringify(decoded),
    risk: decoded.risk,
    status: "current",
    version,
    workId: work._id,
  });
  for (const question of decoded.questions) {
    await ctx.db.insert("workQuestions", {
      alternativesJson: JSON.stringify(question.alternatives),
      answer: question.answer,
      createdAt: Date.now(),
      definitionVersion: version,
      impact: question.impact,
      prompt: question.prompt,
      questionId: question.id,
      recommendation: question.recommendation,
      status: question.status,
      workId: work._id,
    });
  }
  // Auto-advance: Definition persistence starts the Design phase immediately.
  await ctx.db.patch(work._id, {
    definitionVersion: version,
    designVersion: undefined,
    status: "designing",
    updatedAt: Date.now(),
  });
  await appendEvent(
    ctx,
    work._id,
    work.definitionVersion ? "definition.revised" : "definition.saved",
    `definition:${version}`,
    String(definitionId),
    JSON.stringify(decoded)
  );
  // Kick off Design planning automatically.
  await ctx.scheduler.runAfter(0, plannerRef, {
    organizationId: work.organizationId,
    workId: work._id,
  });
  return { definitionId, version };
};

export const saveDefinitionProposal = mutation({
  args: { payloadJson: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await requireWork(ctx, args.workId);
    await requireProjectMember(ctx, work.projectId);
    return await saveDefinition(ctx, work, args.payloadJson, "user");
  },
});

export const reviseDefinition = saveDefinitionProposal;

const reviseQuestion = async (
  ctx: MutationCtx,
  work: Doc<"works">,
  questionId: string,
  update: { status: "answered" | "withdrawn"; answer?: string }
) => {
  const current = await ctx.db
    .query("workDefinitions")
    .withIndex("by_work_and_version", (q) =>
      q.eq("workId", work._id).eq("version", work.definitionVersion ?? 0)
    )
    .unique();
  if (!current) {
    throw new ConvexError("Current Definition not found");
  }
  const definition = JSON.parse(current.payloadJson);
  const persistedQuestions = await ctx.db
    .query("workQuestions")
    .withIndex("by_workId_and_definitionVersion", (q) =>
      q.eq("workId", work._id).eq("definitionVersion", current.version)
    )
    .collect();
  if (
    !persistedQuestions.some((question) => question.questionId === questionId)
  ) {
    throw new ConvexError("Question not found");
  }
  const next = {
    ...definition,
    questions: persistedQuestions.map((question) => ({
      alternatives: JSON.parse(question.alternativesJson) as string[],
      answer:
        question.questionId === questionId ? update.answer : question.answer,
      id: question.questionId,
      impact: question.impact,
      prompt: question.prompt,
      recommendation: question.recommendation,
      status:
        question.questionId === questionId ? update.status : question.status,
    })),
  };
  return await saveDefinition(ctx, work, JSON.stringify(next), "user");
};

export const answerQuestion = mutation({
  args: { answer: v.string(), questionId: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await requireWork(ctx, args.workId);
    await requireProjectMember(ctx, work.projectId);
    const result = await reviseQuestion(ctx, work, args.questionId, {
      answer: args.answer,
      status: "answered",
    });
    await appendEvent(
      ctx,
      work._id,
      "question.answered",
      `question-answered:${args.questionId}:${result.version}`
    );
    return result;
  },
});

export const withdrawQuestion = mutation({
  args: { questionId: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await requireWork(ctx, args.workId);
    await requireProjectMember(ctx, work.projectId);
    const result = await reviseQuestion(ctx, work, args.questionId, {
      status: "withdrawn",
    });
    await appendEvent(
      ctx,
      work._id,
      "question.withdrawn",
      `question-withdrawn:${args.questionId}:${result.version}`
    );
    return result;
  },
});

const saveDesign = async (
  ctx: MutationCtx,
  work: Doc<"works">,
  payloadJson: string,
  createdBy: string
) => {
  if (work.status === "executing" || work.status === "verifying") {
    throw new ConvexError(
      "Cannot revise Work during execution or verification"
    );
  }
  if (!work.definitionVersion) {
    throw new ConvexError("Design requires a current Definition");
  }
  const decoded = await Effect.runPromise(
    validateDesignPacket({
      ...objectPayload(payloadJson),
      definitionVersion: work.definitionVersion,
      version: (work.designVersion ?? 0) + 1,
    })
  ).catch((error: unknown) => {
    throw new ConvexError(
      error instanceof Error ? error.message : "Invalid Design Packet"
    );
  });
  await supersedePriorDesigns(ctx, work._id);
  const designId = await ctx.db.insert("designPackets", {
    createdAt: Date.now(),
    createdBy,
    definitionVersion: decoded.definitionVersion,
    payloadJson: JSON.stringify(decoded),
    status: "current",
    version: decoded.version,
    workId: work._id,
  });
  for (const [ordinal, slice] of decoded.slices.entries()) {
    await ctx.db.insert("workSlices", {
      createdAt: Date.now(),
      designVersion: decoded.version,
      objective: slice.objective,
      observableBehavior: slice.observableBehavior,
      ordinal,
      payloadJson: JSON.stringify(slice),
      sliceId: slice.id,
      status: ordinal === 0 ? "ready" : "planned",
      title: slice.title,
      workId: work._id,
    });
  }
  // Auto-advance: Design persistence makes the Work ready for execution.
  await ctx.db.patch(work._id, {
    designVersion: decoded.version,
    status: "ready",
    updatedAt: Date.now(),
  });
  await appendEvent(
    ctx,
    work._id,
    work.designVersion ? "design.revised" : "design.saved",
    `design:${decoded.version}`,
    String(designId),
    JSON.stringify(decoded)
  );
  return { designId, version: decoded.version };
};

export const saveDesignProposal = mutation({
  args: { payloadJson: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await requireWork(ctx, args.workId);
    await requireProjectMember(ctx, work.projectId);
    return await saveDesign(ctx, work, args.payloadJson, "user");
  },
});

export const reviseDesign = saveDesignProposal;

export const submitDefinitionProposal = mutation({
  args: { payloadJson: v.string(), token: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    if (args.token !== env.FLUE_DB_TOKEN) {
      throw new ConvexError("Invalid agent control token");
    }
    const work = await requireWork(ctx, args.workId);
    return await saveDefinition(ctx, work, args.payloadJson, "work-planner");
  },
});

export const submitDesignProposal = mutation({
  args: { payloadJson: v.string(), token: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    if (args.token !== env.FLUE_DB_TOKEN) {
      throw new ConvexError("Invalid agent control token");
    }
    const work = await requireWork(ctx, args.workId);
    return await saveDesign(ctx, work, args.payloadJson, "work-planner");
  },
});

export const submitQuestion = mutation({
  args: { questionJson: v.string(), token: v.string(), workId: v.id("works") },
  handler: async (ctx, args) => {
    if (args.token !== env.FLUE_DB_TOKEN) {
      throw new ConvexError("Invalid agent control token");
    }
    const work = await requireWork(ctx, args.workId);
    if (work.definitionVersion === undefined) {
      throw new ConvexError("Work has no Definition to attach a question to");
    }
    if (work.status !== "defining" && work.status !== "designing") {
      throw new ConvexError("Questions can only be submitted during planning");
    }
    const question = await Effect.runPromise(
      Schema.decodeUnknownEffect(WorkQuestion)(parsePayload(args.questionJson))
    ).catch((error: unknown) => {
      throw new ConvexError(
        error instanceof Error ? error.message : "Invalid question"
      );
    });
    const existing = await ctx.db
      .query("workQuestions")
      .withIndex("by_workId_and_definitionVersion_and_questionId", (q) =>
        q
          .eq("workId", work._id)
          .eq("definitionVersion", work.definitionVersion!)
          .eq("questionId", question.id)
      )
      .unique();
    const questionRow = {
      alternativesJson: JSON.stringify(question.alternatives),
      answer: question.answer,
      createdAt: Date.now(),
      definitionVersion: work.definitionVersion,
      impact: question.impact,
      prompt: question.prompt,
      questionId: question.id,
      recommendation: question.recommendation,
      status: question.status,
      workId: work._id,
    };
    if (existing) {
      const same =
        existing.prompt === questionRow.prompt &&
        existing.impact === questionRow.impact &&
        existing.recommendation === questionRow.recommendation &&
        existing.alternativesJson === questionRow.alternativesJson &&
        existing.status === questionRow.status &&
        existing.answer === questionRow.answer;
      if (!same) {
        throw new ConvexError("Question ID already has different content");
      }
      return { accepted: false };
    }
    await ctx.db.insert("workQuestions", questionRow);
    await appendEvent(
      ctx,
      work._id,
      "question.created",
      `question-created:${work.definitionVersion}:${question.id}`,
      question.id,
      JSON.stringify(question)
    );
    return { accepted: true };
  },
});

export const recordPlannerFailure = internalMutation({
  args: { error: v.string(), workId: v.id("works") },
  handler: async (ctx, args): Promise<null> => {
    const work = await ctx.db.get(args.workId);
    if (!work || (work.status !== "defining" && work.status !== "designing")) {
      return null;
    }
    await ctx.db.patch(work._id, { status: "blocked", updatedAt: Date.now() });
    await appendEvent(
      ctx,
      work._id,
      "planner.failed",
      `planner-failed:${work._id}:${work.status}`,
      undefined,
      JSON.stringify({ error: args.error, phase: work.status })
    );
    return null;
  },
});

/**
 * Calls the private Flue `plan-work` workflow for the current planning phase.
 * The workflow returns a structured Definition or Design Packet; the planner
 * worker (Flue side) submits it through the authenticated Convex mutations.
 */
export const runPlanner = internalAction({
  args: { organizationId: v.id("organizations"), workId: v.id("works") },
  handler: async (ctx, args) => {
    const flueUrl = (env as typeof env & { readonly FLUE_URL?: string })
      .FLUE_URL;
    if (!flueUrl) {
      await ctx.runMutation(plannerFailureRef, {
        error: "FLUE_URL is not configured in Convex",
        workId: args.workId,
      });
      return null;
    }
    const context = await ctx.runQuery(plannerContextRef, {
      workId: args.workId,
    });
    if (!context) {
      return null;
    }
    const endpoint = new URL(
      "workflows/plan-work",
      `${flueUrl.replace(/\/+/u, "")}/`
    );
    endpoint.searchParams.set("wait", "result");
    try {
      const response = await fetch(endpoint, {
        body: JSON.stringify({
          input: {
            context: {
              ...(context.existingDefinition
                ? { existingDefinition: context.existingDefinition }
                : {}),
              problemStatement: context.objective,
            },
            organizationId: String(args.organizationId),
            phase: context.phase,
            requestId: `planner:${args.workId}:${context.phase}`,
            workId: String(args.workId),
          },
        }),
        headers: {
          authorization: `Bearer ${env.FLUE_DB_TOKEN}`,
          "content-type": "application/json",
          "x-zopu-organization-id": String(args.organizationId),
        },
        method: "POST",
      });
      if (!response.ok) {
        await ctx.runMutation(plannerFailureRef, {
          error: `Plan-work workflow request failed (${response.status})`,
          workId: args.workId,
        });
        return null;
      }
      const raw = (await response.json()) as Record<string, unknown>;
      const data = (raw.data as Record<string, unknown> | undefined) ?? raw;
      const phase = data.phase as string | undefined;
      if (phase === "definition") {
        const payload = {
          ...(data.definition as Record<string, unknown>),
          questions: data.questions ?? [],
        };
        await ctx.runMutation(submitDefinitionRef, {
          payloadJson: JSON.stringify(payload),
          token: env.FLUE_DB_TOKEN,
          workId: args.workId,
        });
      } else if (phase === "design") {
        await ctx.runMutation(submitDesignRef, {
          payloadJson: JSON.stringify(data.design),
          token: env.FLUE_DB_TOKEN,
          workId: args.workId,
        });
      } else {
        await ctx.runMutation(plannerFailureRef, {
          error: `Unexpected planner phase: ${String(phase)}`,
          workId: args.workId,
        });
      }
    } catch (error) {
      await ctx.runMutation(plannerFailureRef, {
        error: error instanceof Error ? error.message : String(error),
        workId: args.workId,
      });
    }
    return null;
  },
});

export const getPlannerContext = internalQuery({
  args: { workId: v.id("works") },
  handler: async (ctx, args) => {
    const work = await ctx.db.get(args.workId);
    if (!work) {
      return null;
    }
    const phase: "definition" | "design" =
      work.status === "designing" ? "design" : "definition";
    let existingDefinition: string | undefined;
    if (phase === "design") {
      const current = await ctx.db
        .query("workDefinitions")
        .withIndex("by_work_and_version", (q) =>
          q.eq("workId", work._id).eq("version", work.definitionVersion ?? 0)
        )
        .unique();
      if (current) {
        existingDefinition = current.payloadJson;
      }
    }
    return {
      objective: work.objective,
      phase,
      status: work.status,
      title: work.title,
      ...(existingDefinition ? { existingDefinition } : {}),
    };
  },
});

export const listForProject = query({
  args: { projectId: v.id("projects") },
  handler: async (ctx, args) => {
    await requireProjectMember(ctx, args.projectId);
    const works = await ctx.db
      .query("works")
      .withIndex("by_project_and_createdAt", (q: any) =>
        q.eq("projectId", args.projectId)
      )
      .order("desc")
      .take(100);
    return await Promise.all(
      works.map(async (work) => {
        const definitions = await ctx.db
          .query("workDefinitions")
          .withIndex("by_work_and_version", (q: any) =>
            q.eq("workId", work._id)
          )
          .order("desc")
          .take(10);
        const designs = await ctx.db
          .query("designPackets")
          .withIndex("by_work_and_version", (q: any) =>
            q.eq("workId", work._id)
          )
          .order("desc")
          .take(10);
        const slices = await ctx.db
          .query("workSlices")
          .withIndex("by_workId_and_designVersion", (q) =>
            q
              .eq("workId", work._id)
              .eq("designVersion", work.designVersion ?? 0)
          )
          .collect();
        const runRows = await ctx.db
          .query("workRuns")
          .withIndex("by_work_and_createdAt", (q: any) =>
            q.eq("workId", work._id)
          )
          .order("desc")
          .take(10);
        const runs = await Promise.all(
          runRows.map(async (run) => {
            const attempts = await ctx.db
              .query("workAttempts")
              .withIndex("by_runId_and_number", (q) => q.eq("runId", run._id))
              .collect();
            const eventsByAttempt = await Promise.all(
              attempts.map((attempt) =>
                ctx.db
                  .query("workAttemptEvents")
                  .withIndex("by_attempt_and_sequence", (q: any) =>
                    q.eq("attemptId", attempt._id)
                  )
                  .collect()
              )
            );
            const attemptEvents = eventsByAttempt
              .flat()
              .sort((left, right) => left.occurredAt - right.occurredAt);
            const artifacts = await ctx.db
              .query("workArtifacts")
              .withIndex("by_runId_and_createdAt", (q) =>
                q.eq("runId", run._id)
              )
              .collect();
            return { ...run, artifacts, attemptEvents, attempts };
          })
        );
        const events = await ctx.db
          .query("workEvents")
          .withIndex("by_work_and_createdAt", (q: any) =>
            q.eq("workId", work._id)
          )
          .order("desc")
          .take(100);
        const attachments = await ctx.db
          .query("signalWorkAttachments")
          .withIndex("by_work", (q: any) => q.eq("workId", work._id))
          .collect();
        const signals = await Promise.all(
          attachments.map(async (attachment) => {
            const signal = await ctx.db.get(attachment.signalId);
            if (!signal) {
              return null;
            }
            const sources = await ctx.db
              .query("signalSources")
              .withIndex("by_signalId_and_ordinal", (q) =>
                q.eq("signalId", signal._id)
              )
              .collect();
            return {
              createdAt: signal.createdAt,
              signalId: signal._id,
              sources: sources
                .sort((a, b) => a.ordinal - b.ordinal)
                .map((source) => ({
                  createdAt: source.sourceCreatedAt,
                  messageId: String(source.messageId),
                  rawText: source.rawTextSnapshot,
                  submissionId: null,
                })),
              summary: signal.summary,
              title: signal.title,
            };
          })
        );
        const currentDefinition = definitions.find(
          (definition) => definition.status === "current"
        );
        const currentDesign = designs.find(
          (design) => design.status === "current"
        );
        return {
          ...work,
          definition: currentDefinition
            ? JSON.parse(currentDefinition.payloadJson)
            : null,
          definitions,
          design: currentDesign ? JSON.parse(currentDesign.payloadJson) : null,
          designs,
          events,
          runs,
          signals: signals.filter((signal) => signal !== null),
          slices: slices.sort((a, b) => a.ordinal - b.ordinal),
        };
      })
    );
  },
});

export const listForOrganization = query({
  args: {},
  handler: async (ctx) => {
    const { organizationId } = await requireCurrentOrganization(ctx);
    const works = await ctx.db
      .query("works")
      .withIndex("by_organization_and_createdAt", (q) =>
        q.eq("organizationId", organizationId)
      )
      .order("desc")
      .take(100);
    return await Promise.all(
      works.map(async (work) => {
        const project = await ctx.db.get(work.projectId);
        return {
          ...work,
          project: project
            ? {
                id: String(project._id),
                name: project.name,
              }
            : null,
          repositoryReady: Boolean(project?.gitRepositoryId),
        };
      })
    );
  },
});