package gitea

import (
	"context"
	"encoding/json"
	"fmt"
	"net/url"
	"strconv"
	"strings"
)

// DispatchWorkflowArgs is the request body for a workflow_dispatch trigger.
type DispatchWorkflowArgs struct {
	Ref    string         `json:"ref"`
	Inputs map[string]any `json:"inputs,omitempty"`
}

// WorkflowRunTrigger holds the run ID extracted from the Location header.
type WorkflowRunTrigger struct {
	RunID int64
}

// DispatchWorkflow triggers a workflow_dispatch event and returns the new run ID.
func (c *Client) DispatchWorkflow(ctx context.Context, owner, repo, workflow string, args DispatchWorkflowArgs) (*WorkflowRunTrigger, error) {
	p := fmt.Sprintf("/api/v1/repos/%s/%s/actions/workflows/%s/dispatches", owner, repo, workflow)
	payload, err := json.Marshal(args)
	if err != nil {
		return nil, err
	}
	resp, err := c.doRaw(ctx, "POST", p, payload)
	if err != nil {
		return nil, err
	}
	if resp.Status != 204 {
		if mapErr := MapStatus(resp.Status, resp.Body); mapErr != nil {
			return nil, mapErr
		}
		return nil, fmt.Errorf("unexpected status %d", resp.Status)
	}
	location := resp.Headers.Get("Location")
	if location == "" {
		return nil, fmt.Errorf("missing Location header in dispatch response")
	}
	// Location is e.g. "/api/v1/repos/o/r/actions/runs/123" — take the last segment.
	parts := strings.Split(strings.TrimRight(location, "/"), "/")
	if len(parts) == 0 {
		return nil, fmt.Errorf("malformed Location: %s", location)
	}
	runID, err := strconv.ParseInt(parts[len(parts)-1], 10, 64)
	if err != nil {
		return nil, fmt.Errorf("parse run id from %q: %w", location, err)
	}
	return &WorkflowRunTrigger{RunID: runID}, nil
}

// WorkflowRun represents a Gitea Actions run.
type WorkflowRun struct {
	ID           int64  `json:"id"`
	DisplayTitle string `json:"display_title,omitempty"`
	Status       string `json:"status"`     // queued | in_progress | completed
	Conclusion   string `json:"conclusion"` // success | failure | cancelled | skipped (only when completed)
	Event        string `json:"event,omitempty"`
	HeadSHA      string `json:"head_sha,omitempty"`
	HeadBranch   string `json:"head_branch,omitempty"`
	WorkflowID   string `json:"workflow_id,omitempty"`
	RunNumber    int64  `json:"run_number,omitempty"`
	StartedAt    string `json:"started_at"`
	UpdatedAt    string `json:"updated_at,omitempty"`
	HTMLURL      string `json:"html_url"`
	Actor        struct {
		Login string `json:"login"`
	} `json:"actor,omitempty"`
}

// GetWorkflowRun fetches the status of a specific Actions run.
func (c *Client) GetWorkflowRun(ctx context.Context, owner, repo string, runID int64) (*WorkflowRun, error) {
	p := fmt.Sprintf("/api/v1/repos/%s/%s/actions/runs/%d", owner, repo, runID)
	body, status, err := c.GetJSON(ctx, p)
	if err != nil {
		return nil, err
	}
	if err := MapStatus(status, body); err != nil {
		return nil, err
	}
	var run WorkflowRun
	if err := json.Unmarshal(body, &run); err != nil {
		return nil, err
	}
	return &run, nil
}

// ListWorkflowRunsArgs captures the optional query params for ListWorkflowRuns.
type ListWorkflowRunsArgs struct {
	Branch   string
	HeadSHA  string
	Status   string // queued | in_progress | completed | all
	Event    string // push | pull_request | schedule | workflow_dispatch | all
	Workflow string
	Page     int
	Limit    int
}

type workflowRunsResponse struct {
	TotalCount   int64         `json:"total_count"`
	WorkflowRuns []WorkflowRun `json:"workflow_runs"`
}

// ListWorkflowRuns fetches recent Actions runs for a repo with optional filters.
// Status / Event of "all" or "" are treated as no-filter.
func (c *Client) ListWorkflowRuns(ctx context.Context, owner, repo string, args ListWorkflowRunsArgs) (*workflowRunsResponse, error) {
	q := url.Values{}
	if args.Branch != "" {
		q.Set("branch", args.Branch)
	}
	if args.HeadSHA != "" {
		q.Set("head_sha", args.HeadSHA)
	}
	if args.Status != "" && args.Status != "all" {
		q.Set("status", args.Status)
	}
	if args.Event != "" && args.Event != "all" {
		q.Set("event", args.Event)
	}
	if args.Workflow != "" {
		q.Set("workflow", args.Workflow)
	}
	if args.Page > 0 {
		q.Set("page", strconv.Itoa(args.Page))
	}
	if args.Limit > 0 {
		q.Set("limit", strconv.Itoa(args.Limit))
	}
	p := fmt.Sprintf("/api/v1/repos/%s/%s/actions/runs?%s", owner, repo, q.Encode())
	body, status, err := c.GetJSON(ctx, p)
	if err != nil {
		return nil, err
	}
	if err := MapStatus(status, body); err != nil {
		return nil, err
	}
	var resp workflowRunsResponse
	if err := json.Unmarshal(body, &resp); err != nil {
		return nil, err
	}
	return &resp, nil
}