export const meta = {
  apiVersion: 1,
  key: "kling",
  name: "Kling",
  icon: "Kling.Color",
  description: {
    en: "Kuaishou Kling video generation (text-to-video and image-to-video)",
    zh: "快手可灵视频生成（文生视频、图生视频）",
  },
  version: "1.0.0",
  author: { name: "QuantumNous" },
  channelTypes: [50],
  models: ["kling-v1", "kling-v1-6", "kling-v2-master"],
  fetchMode: "per_task",
  usageSchema: {
    units: {
      type: "number",
      unit: "credit",
      description: {
        en: "Kling final unit deduction (estimated at submit, actual on completion).",
        zh: "可灵最终单位消耗（提交时预估，完成后按实际值）。",
      },
    },
  },
  usageExamples: [
    { label: "v1 std 5s", facts: { units: 1 } },
    { label: "v1 pro 5s", facts: { units: 3.5 } },
    { label: "v1-6 std 5s", facts: { units: 2 } },
    { label: "v1-6 pro 10s", facts: { units: 7 } },
    { label: "v2-master pro 5s", facts: { units: 10 } },
  ],
  protocols: [{ name: "openai_responses", supports: ["stream", "sync", "background"] }, "openai_video"],
  routes: [
    { method: "POST", path: "/kling/v1/videos/text2video", type: "submit", action: "text_to_video", decode: "decodeSubmit", render: "taskCreated" },
    { method: "POST", path: "/kling/v1/videos/image2video", type: "submit", action: "image_to_video", decode: "decodeSubmit", render: "taskCreated" },
    { method: "GET", path: "/kling/v1/videos/text2video/:task_id", type: "query", render: "taskStatus" },
    { method: "GET", path: "/kling/v1/videos/image2video/:task_id", type: "query", render: "taskStatus" },
  ],
};

// Official unit consumption (units per output video second), not a currency price.
// Source: https://kling.ai/dev/pricing
const UNITS_PER_SECOND = {
  "kling-v1": { std: 0.2, pro: 0.7 },
  "kling-v1-6": { std: 0.4, pro: 0.7 },
  "kling-v2-master": { pro: 2.0 },
};

function trimmed(value) {
  return String(value || "").trim();
}

function responsesInput(req) {
  const texts = [],
    images = [];
  const input = req.input;
  if (typeof input === "string") texts.push(input);
  else if (Array.isArray(input)) {
    for (const item of input) {
      if (typeof item === "string") {
        texts.push(item);
        continue;
      }
      if (!item || typeof item !== "object" || Array.isArray(item)) continue;
      const content = item.content === undefined ? [item] : Array.isArray(item.content) ? item.content : [item.content];
      for (const part of content) {
        if (typeof part === "string") {
          texts.push(part);
          continue;
        }
        if (!part || typeof part !== "object" || Array.isArray(part)) continue;
        if (["input_text", "text"].includes(part.type) && typeof part.text === "string") texts.push(part.text);
        if (["input_image", "image_url"].includes(part.type)) {
          let image = part.image_url;
          if (image && typeof image === "object") image = image.url;
          if (trimmed(image)) images.push(trimmed(image));
        }
      }
    }
  }
  return {
    prompt: texts
      .filter(function (text) {
        return trimmed(text);
      })
      .join("\n"),
    images: images,
  };
}

function responsesVideoText(ctx) {
  const artifact = ctx && ctx.artifacts && ctx.artifacts.video;
  const url = trimmed(artifact && artifact.url);
  if (!url) throw new Error("video artifact is unavailable");
  const escaped = url.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
  return '<video controls src="' + escaped + '"></video>';
}

function isRelay(apiKey) {
  return apiKey.startsWith("sk-");
}

function tokenFor(apiKey) {
  if (isRelay(apiKey)) return apiKey;
  const parts = apiKey.split("|");
  if (parts.length !== 2) throw new Error("invalid api_key, required format is accessKey|secretKey");
  const now = utils.unixNow();
  return utils.jwtSignHS256({ iss: parts[0].trim(), exp: now + 1800, nbf: now - 5 }, parts[1].trim());
}

function pathFor(action) {
  return action === "image_to_video" ? "/v1/videos/image2video" : "/v1/videos/text2video";
}

function urlFor(baseUrl, apiKey, action) {
  return baseUrl + (isRelay(apiKey) ? "/kling" : "") + pathFor(action);
}

function aspectRatio(size) {
  const ratios = { "1024x1024": "1:1", "512x512": "1:1", "1280x720": "16:9", "1920x1080": "16:9", "720x1280": "9:16", "1080x1920": "9:16" };
  return ratios[size] || "1:1";
}

function submitModel(ctx, req) {
  return (ctx && ctx.upstreamModel) || (ctx && ctx.model) || (req && req.model) || "kling-v1";
}

function resolveKlingMode(model, mode) {
  const raw = trimmed(mode).toLowerCase();
  if (model === "kling-v2-master") {
    if (raw === "std") throw new Error("kling-v2-master does not support mode std");
    if (raw && raw !== "pro") throw new Error("mode must be pro");
    return "pro";
  }
  if (!raw) return "std";
  if (raw !== "std" && raw !== "pro") throw new Error("mode must be std or pro");
  return raw;
}

function perSecondRate(model, mode) {
  const table = UNITS_PER_SECOND[model] || UNITS_PER_SECOND["kling-v1"];
  if (table[mode] !== undefined) return table[mode];
  if (table.pro !== undefined) return table.pro;
  return table.std;
}

function estimateUnits(model, mode, durationSeconds) {
  return perSecondRate(model, mode) * durationSeconds;
}

// Official current pages list 3–15s for new models; old-model duration "5"|"10"
// is unverifiable (research 2026-08-27). Keep permissive positive integers up to
// the host task duration bound.
function validateKlingDuration(value) {
  const n = Number(value);
  if (!Number.isInteger(n) || n <= 0 || n > 3600) throw new Error("seconds must be a positive integer at most 3600");
  return n;
}

function outboundDuration(req) {
  const n = Number(req && req.duration);
  if (Number.isFinite(n) && n > 0) return n;
  const metadata = (req && req.metadata) || {};
  const fromMeta = Number(metadata.duration);
  if (Number.isFinite(fromMeta) && fromMeta > 0) return fromMeta;
  return 5;
}

function outboundMode(req, model) {
  const metadata = (req && req.metadata) || {};
  return resolveKlingMode(model, (req && req.mode) || metadata.mode);
}

function hasKlingImage(req, hasInputReferenceFile) {
  if (hasInputReferenceFile) return true;
  const metadata = (req && req.metadata) || {};
  if (req && req.image && typeof req.image === "object" && !Array.isArray(req.image) && req.image.__fileRef) return true;
  return Boolean(trimmed(req && req.input_reference) || trimmed(req && req.image) || metadata.image || metadata.image_tail);
}

function filePlaceholder(image) {
  if (!image || typeof image !== "object" || Array.isArray(image) || !image.__fileRef) return image;
  const placeholder = { __fileRef: image.__fileRef, encoding: image.encoding };
  if (image.mimeType) placeholder.mimeType = image.mimeType;
  if (image.maxBytes !== undefined && image.maxBytes !== null) placeholder.maxBytes = image.maxBytes;
  return placeholder;
}

function decodeNativeSubmit(ctx) {
  if (!ctx.body || ctx.body.kind !== "json") throw new Error("JSON body required");
  const body = ctx.body.value;
  if (!body || typeof body !== "object" || Array.isArray(body)) throw new Error("request body must be an object");
  let model = typeof body.model_name === "string" ? body.model_name : "";
  if (model === "") model = typeof body.model === "string" ? body.model : "";
  if (!model.trim()) throw new Error("model is required");
  return {
    kind: "submit",
    model: model,
    requestBody: {
      model: model,
      prompt: typeof body.prompt === "string" ? body.prompt : "",
      metadata: body,
    },
  };
}

export const native = {
  decodeSubmit: decodeNativeSubmit,
  taskCreated: function (ctx, task) {
    const result = task.data || {},
      data = result.data || {};
    return Object.assign({}, result, { data: Object.assign({}, data, { task_id: task.task_id }) });
  },
  taskStatus: function (ctx, task) {
    if (task.data && typeof task.data === "object" && !Array.isArray(task.data)) {
      const result = task.data,
        data = result.data && typeof result.data === "object" ? result.data : {};
      return Object.assign({}, result, { data: Object.assign({}, data, { task_id: task.task_id }) });
    }
    const statusMap = { NOT_START: "submitted", SUBMITTED: "submitted", QUEUED: "submitted", IN_PROGRESS: "processing", SUCCESS: "succeed", FAILURE: "failed" };
    return { code: 0, data: { task_id: task.task_id, task_status: statusMap[task.status] || "submitted", task_status_msg: task.fail_reason || "" } };
  },
  error: function (ctx, error) {
    return { code: error.code, message: error.message };
  },
};

export function buildSubmitRequest(ctx) {
  const req = ctx.requestBody;
  const metadata = req.metadata || {};
  const inferredAction = req.image || metadata.image || metadata.image_tail ? "image_to_video" : "text_to_video";
  const action = ctx.action === "text_to_video" || ctx.action === "image_to_video" ? ctx.action : inferredAction;
  const model = ctx.upstreamModel || "kling-v1";
  const body = Object.assign(
    {
      prompt: req.prompt,
      image: req.image,
      mode: outboundMode(req, model),
      duration: String(req.duration || 5),
      aspect_ratio: aspectRatio(req.size),
      model_name: model,
      model: model,
      cfg_scale: 0.5,
    },
    metadata
  );
  body.mode = outboundMode({ mode: body.mode, metadata: metadata }, model);
  if (body.image) body.image = filePlaceholder(body.image);
  if (body.image_tail) body.image_tail = filePlaceholder(body.image_tail);
  if (!body.prompt) delete body.prompt;
  if (!body.image) delete body.image;
  return {
    url: urlFor(ctx.baseUrl, ctx.apiKey, action),
    method: "POST",
    headers: { "Content-Type": "application/json", Accept: "application/json", Authorization: "Bearer " + tokenFor(ctx.apiKey), "User-Agent": "kling-sdk/1.0" },
    body: body,
    action: action,
  };
}

export function parseSubmitResponse(ctx, resp) {
  const result = resp.body || {};
  if (result.code !== 0) throw new Error(result.message || "kling submit failed");
  if (!result.data || !result.data.task_id) throw new Error("missing task_id");
  return { taskId: result.data.task_id, taskData: result };
}

export function extractUsage(ctx) {
  if (ctx.usagePurpose === "billing_ratios") return null;
  const req = ctx.requestBody || {};
  const model = submitModel(ctx, req);
  const duration = outboundDuration(req);
  const mode = outboundMode(req, model);
  return { units: estimateUnits(model, mode, duration) };
}

export function buildQueryRequest(ctx) {
  return {
    url: urlFor(ctx.baseUrl, ctx.apiKey, ctx.action) + "/" + ctx.taskId,
    method: "GET",
    headers: { Accept: "application/json", Authorization: "Bearer " + tokenFor(ctx.apiKey), "User-Agent": "kling-sdk/1.0" },
  };
}

export function parseTaskResult(ctx, body) {
  const data = body.data || {};
  const statuses = { submitted: "SUBMITTED", processing: "IN_PROGRESS", succeed: "SUCCESS", failed: "FAILURE" };
  const status = statuses[data.task_status];
  if (!status) throw new Error("unknown task status: " + data.task_status);
  const videos = status === "SUCCESS" && data.task_result && data.task_result.videos ? data.task_result.videos : [];
  const result = { code: body.code || 0, taskId: data.task_id, status: status, reason: data.task_status_msg || "" };
  if (videos.length && videos[0].url) result.url = videos[0].url;
  const units = Number.parseFloat(data.final_unit_deduction || "");
  if (Number.isFinite(units) && units > 0) {
    result.completionTokens = Math.ceil(units);
    result.totalTokens = Math.ceil(units);
  }
  return result;
}

function artifactData(ctx) {
  const data = (ctx && ctx.data) || {};
  if (data.data && typeof data.data === "object" && data.data.task_id && Object.prototype.hasOwnProperty.call(data.data, "data")) return data.data.data || {};
  return data;
}

function artifactVideoURL(ctx) {
  const result = (artifactData(ctx).data || {}).task_result || {};
  const videos = Array.isArray(result.videos) ? result.videos : [];
  return videos.length ? String(videos[0].url || "").trim() : "";
}

export function listArtifacts(task) {
  return task.status === "SUCCESS" && artifactVideoURL(task) ? [{ key: "video", type: "video" }] : [];
}

export function buildContentRequest(ctx) {
  if (ctx.artifactKey !== "video") throw new Error("artifact_not_found");
  const url = artifactVideoURL(ctx);
  if (!url) throw new Error("artifact_not_found");
  return { url: url, method: ctx.clientRequest.method, credentialless: true };
}

export function extractUsageOnComplete(_task, _taskResult, body) {
  const data = (body && body.data) || {};
  if (
    !Object.prototype.hasOwnProperty.call(data, "final_unit_deduction") ||
    data.final_unit_deduction === undefined ||
    data.final_unit_deduction === null ||
    data.final_unit_deduction === ""
  ) {
    return null;
  }
  const units = Number.parseFloat(data.final_unit_deduction);
  if (!Number.isFinite(units)) return null;
  return { units: units };
}

export const protocols = {
  openai_responses: {
    decodeRequest: function (ctx) {
      if (!ctx.body || ctx.body.kind !== "json") throw new Error("JSON body required");
      const req = ctx.body.value;
      if (!req || typeof req !== "object" || Array.isArray(req)) throw new Error("request body must be an object");
      const model = trimmed(ctx.model);
      if (!model) throw new Error("model is required");
      if (req.input !== undefined && typeof req.input !== "string" && !Array.isArray(req.input)) throw new Error("input must be a string or array");
      if (req.images !== undefined && !Array.isArray(req.images)) throw new Error("images must be an array");
      if (req.metadata !== undefined && (!req.metadata || typeof req.metadata !== "object" || Array.isArray(req.metadata)))
        throw new Error("metadata must be an object");
      const input = responsesInput(req);
      const prompt = input.prompt || trimmed(req.prompt);
      const images = [];
      for (const image of [req.image, req.input_reference].concat(req.images || [], input.images)) {
        if (trimmed(image) && !images.includes(trimmed(image))) images.push(trimmed(image));
      }
      if (!prompt && images.length === 0) throw new Error("input is required");
      const metadata = Object.assign({}, req.metadata || {});
      if (Object.prototype.hasOwnProperty.call(req, "mode")) metadata.mode = req.mode;
      metadata.mode = resolveKlingMode(ctx.upstreamModel || model, metadata.mode);
      if (images.length > 1 && !metadata.image_tail) metadata.image_tail = images[1];
      const requestBody = { model: model, prompt: prompt, metadata: metadata };
      if (images.length) requestBody.image = images[0];
      if (Object.prototype.hasOwnProperty.call(req, "seconds")) requestBody.duration = req.seconds;
      else if (Object.prototype.hasOwnProperty.call(req, "duration")) requestBody.duration = req.duration;
      if (Object.prototype.hasOwnProperty.call(req, "size")) requestBody.size = req.size;
      return { kind: "submit", model: model, action: images.length ? "image_to_video" : "text_to_video", requestBody: requestBody };
    },
    renderEvents: function (ctx, task, previousState) {
      const status = String(task.status || "UNKNOWN").toUpperCase();
      const value = Number(String(task.progress || "").replace("%", ""));
      const progress = Number.isFinite(value) && value >= 0 && value <= 100 ? value : null;
      const state = { status: status, progress: progress };
      if (status === "SUCCESS") {
        const text = responsesVideoText(ctx);
        const events = previousState && previousState.status === status ? [] : [{ type: "output", data: text }];
        return { events: events, state: state, done: true };
      }
      if (status === "FAILURE")
        return { events: [{ type: "error", code: "task_failed", message: task.fail_reason || "task failed" }], state: state, done: true };
      if (previousState && previousState.status === status && previousState.progress === progress) return { events: [], state: state, done: false };
      const event = { type: "progress", message: status.toLowerCase() };
      if (progress !== null) event.progress = progress;
      return { events: [event], state: state, done: false };
    },
    renderFinal: function (ctx, _task) {
      return {
        output: [
          {
            type: "message",
            status: "completed",
            role: "assistant",
            content: [{ type: "output_text", text: responsesVideoText(ctx), annotations: [], logprobs: [] }],
          },
        ],
        metadata: { vendor: "kling" },
      };
    },
  },
  openai_video: {
    decodeRequest: function (ctx) {
      if (!ctx.body || (ctx.body.kind !== "json" && ctx.body.kind !== "multipart")) throw new Error("JSON or multipart body required");
      let req;
      let hasInputReferenceFile = false;
      if (ctx.body.kind === "json") {
        if (!ctx.body.value || Array.isArray(ctx.body.value)) throw new Error("JSON object required");
        req = Object.assign({}, ctx.body.value);
      } else {
        const first = function (name) {
          const values = (ctx.body.fields || {})[name] || [];
          if (values.length > 1) throw new Error(name + " must be provided once");
          return values[0];
        };
        req = {};
        const fields = ctx.body.fields || {};
        for (const name of Object.keys(fields)) {
          req[name] = first(name);
        }
        for (const file of ctx.body.files || []) {
          if (file.field !== "input_reference") throw new Error("unexpected file field: " + file.field);
          if (hasInputReferenceFile) throw new Error("input_reference must be provided once");
          hasInputReferenceFile = true;
        }
        if (req.metadata !== undefined) {
          let parsed;
          try {
            parsed = JSON.parse(req.metadata);
          } catch (e) {
            throw new Error("metadata must be a JSON object string");
          }
          if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) throw new Error("metadata must be a JSON object string");
          req.metadata = parsed;
        }
        if (req.seconds !== undefined) req.seconds = Number(req.seconds);
        else if (req.duration !== undefined) req.seconds = Number(req.duration);
      }
      const seconds = req.seconds === undefined ? req.duration : req.seconds;
      if (seconds !== undefined) req.duration = validateKlingDuration(seconds);
      else req.duration = 5;
      if (hasInputReferenceFile) {
        req.image = { __fileRef: "request_file:input_reference", encoding: "base64", maxBytes: 10485760 };
      } else {
        const image = trimmed(req.input_reference || req.image);
        if (image) req.image = image;
      }
      const model = ctx.upstreamModel || ctx.model || req.model || "kling-v1";
      const metadata = req.metadata || {};
      req.mode = resolveKlingMode(model, req.mode || metadata.mode);
      const hasImage = hasKlingImage(req, hasInputReferenceFile);
      return {
        kind: "submit",
        model: ctx.model,
        action: hasImage ? "image_to_video" : "text_to_video",
        requestBody: Object.assign({}, req, { model: ctx.model }),
      };
    },
    render: function (ctx, task) {
      const response = task.data || {};
      const data = response.data || {};
      const statusMap = { NOT_START: "queued", SUBMITTED: "queued", QUEUED: "queued", IN_PROGRESS: "in_progress", SUCCESS: "completed", FAILURE: "failed" };
      const output = {
        id: task.task_id,
        object: "video",
        model: "",
        status: statusMap[task.status] || "unknown",
        progress: Number(String(task.progress || "0").replace("%", "")),
        created_at: data.created_at || 0,
      };
      if (data.updated_at) output.completed_at = data.updated_at;
      const videos = data.task_result && data.task_result.videos ? data.task_result.videos : [];
      if (videos.length) {
        if (videos[0].duration) output.seconds = videos[0].duration;
      }
      if (response.code !== 0 && response.message) output.error = { message: response.message, code: String(response.code) };
      if (data.task_status === "failed") output.error = { message: data.task_status_msg, code: "" };
      return output;
    },
  },
};